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WO2010068994A1 - Procédé de production de composés chimiques - Google Patents

Procédé de production de composés chimiques Download PDF

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Publication number
WO2010068994A1
WO2010068994A1 PCT/AU2009/001645 AU2009001645W WO2010068994A1 WO 2010068994 A1 WO2010068994 A1 WO 2010068994A1 AU 2009001645 W AU2009001645 W AU 2009001645W WO 2010068994 A1 WO2010068994 A1 WO 2010068994A1
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WO
WIPO (PCT)
Prior art keywords
cathode
anode
compartment
carbon dioxide
membrane
Prior art date
Application number
PCT/AU2009/001645
Other languages
English (en)
Inventor
Rene Rozendal
Korneel Rabaey
Original Assignee
The University Of Queensland
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2008906519A external-priority patent/AU2008906519A0/en
Application filed by The University Of Queensland filed Critical The University Of Queensland
Priority to JP2011541023A priority Critical patent/JP2012512326A/ja
Priority to CN2009801545116A priority patent/CN102282295A/zh
Priority to US13/140,947 priority patent/US20110315560A1/en
Priority to BRPI0923180A priority patent/BRPI0923180A2/pt
Priority to EP20090832723 priority patent/EP2373832A1/fr
Priority to AU2009328649A priority patent/AU2009328649A1/en
Priority to CA 2747212 priority patent/CA2747212A1/fr
Publication of WO2010068994A1 publication Critical patent/WO2010068994A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/005—Combined electrochemical biological processes
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
    • C12M25/06—Plates; Walls; Drawers; Multilayer plates
    • C12M25/08—Plates; Walls; Drawers; Multilayer plates electrically charged
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M35/00—Means for application of stress for stimulating the growth of microorganisms or the generation of fermentation or metabolic products; Means for electroporation or cell fusion
    • C12M35/02—Electrical or electromagnetic means, e.g. for electroporation or for cell fusion
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/62—Carboxylic acid esters
    • C12P7/625—Polyesters of hydroxy carboxylic acids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
    • H01M8/0606—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants
    • H01M8/0612—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants from carbon-containing material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/20—Indirect fuel cells, e.g. fuel cells with redox couple being irreversible
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • C02F2001/4619—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water only cathodic or alkaline water, e.g. for reducing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/46115—Electrolytic cell with membranes or diaphragms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4618—Supplying or removing reactants or electrolyte
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4619—Supplying gas to the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

Definitions

  • the present invention relates to a process for producing chemicals. More particularly, the present invention relates to a process for producing chemicals using bioelectrochemical systems.
  • Bioelectrochemical systems such as microbial fuel cells and microbial electrolysis cells, have emerged as potentially interesting technology for the production of energy and products.
  • Bioelectrochemical systems are based on the use of electrochemical Iy active microorganisms, which can either donate electrons to an anode or accept electrons from a cathode. If electrochemically active micro-organisms are electrochemically interacting with an anode, such an electrode is referred to as a biological anode, bioanode or microbial bioanode.
  • Bioelectrochemical systems are generally regarded as a promising future technology for the production of energy from organic material present from aqueous waste streams (e.g., wastewater). (Rozendal et al., Trends Biotechnol. 2008, 26, 450-459).
  • aqueous waste streams e.g., wastewater
  • Industrial, agricultural and domestic waste waters typically contain dissolved organics that require removal before discharge into the environment. Typically, these organic pollutants are removed by aerobic treatment, which can consume large amounts of electrical energy for aeration.
  • Bioelectrochemical wastewater treatment can be accomplished by electrically coupling a microbial bioanode to a counter electrode (cathode) that performs a reduction reaction.
  • a microbial bioanode to a counter electrode (cathode) that performs a reduction reaction.
  • the electrode reactions can occur and electrons can flow from the anode to the cathode.
  • the electrochemical Iy active microorganisms at the anode transfer electrons to an electrode (anode) while they are oxidising (and thus removing) (in)organic pollutants in aqueous waste streams (e.g., wastewater).
  • a bioelectrochemical system may operate as a fuel cell (in which case electrical energy is produced - e.g.
  • biocatalysed electrolysis which is a bioelectrochemical system for the production of hydrogen gas from bio-oxidisable material (WO 2005005981, the entire contents of which are herein incorporated by cross- reference).
  • the bio-oxisable material used for biocatalysed electrolysis can, for example, be dissolved organic material in wastewater.
  • Rozendal and Buisman introduced bio-oxisable material into a reactor provided with an anode and a cathode and containing anodophilic bacteria in an aqueous medium, applied a potential between the anode and cathode of between 0.1 and 1.5 volt, while maintaining a pH of between 3 and 9 in the aqueous medium and collected hydrogen gas from the cathode.
  • cathodophilic microorganisms can be used for catalyzing cathodic reactions for the production of valuable chemicals.
  • Cathodophilic microorganisms are microorganisms that can interact with a cathode by accepting electrons or cathodic reaction products (such as hydrogen or reduced electron mediators) from the cathode and utilizing these for the production of valuable chemicals.
  • Such electrode is referred to as a biological cathode, biocathode or microbial biocathode.
  • Electrons and cathodic reaction products are commonly referred to as reducing equivalents. Reducing equivalents allow reducing electron acceptors and can serve as electron donor for a microbial metabolism. Electron mediators are redox-active organic compounds and are known to person skilled in the art. They include compounds such as quinones, neutral red, methyl viologen, etc. Electron mediators shuttle in between the electrode and the microorganisms. During this shuttling the electron mediators are continuously reduced by the electrode and subsequently oxidized again by the microorganism for the production of the chemical products.
  • Microbial biocathodes have already been demonstrated for oxygen reduction (e.g., Rabaey et al., ISME J. 2008, 2, 1387-1396), nitrate reduction (e.g., Clauwaert et al., Environ. Sci. Technol., 2007, 41, 7564-7569), dechlorination (e.g., Aulenta et al., Environ. Sci. Technol., 2007, 41 , 2554-2559), hydrogen production (e.g., Rozendal et al., Environ. Sci. Technol., 2008, 42, 629-634), and methane production (e.g., Clauwaert et al., Water Sci. Technol., 2008, 57, 575-579), but have not been described for the production of more complex molecules such as those described above.
  • oxygen reduction e.g., Rabaey et al., ISME J. 2008, 2, 1387-1396
  • mixed microbial cultures i.e., multiple species
  • complex molecules are therefore typically produced with a defined microbial culture, such as a pure microbial culture (i.e., single specie) or at least a well-defined co-culture (i.e., two or more carefully selected species).
  • a microbial biocathode capable of producing complex molecules would also require a defined microbial culture of cathodophilic microorganisms (Rozendal et al., Trends Biotechnol. 2008, 26, 450-459), which are unlikely to be naturally enriched from complex inocula such as wastewater.
  • a defined microbial culture of cathodophilic microorganisms should be a carefully selected or genetically engineered pure culture, but could also be a carefully selected co-culture of two or more carefully selected or genetically engineered pure cultures. These pure cultures or co-cultures should consist of microbial species that are capable of catalyzing the production reaction of the desired complex molecule.
  • a disadvantage of using a defined culture of cathodophilic microorganisms is that these cultures are susceptible to contamination with other microorganisms. So unless the activity of these other micro-organisms can be suppressed, these other microorganisms will break down the products produced by the defined culture of cathodophilic microorganisms and consequently limit the product output of the bioelectrochemical system. Bioelectrochemical systems can prevent this contamination with other microorganisms by applying an ion exchange membrane between the anode and the cathode. The application of an ion exchange membrane isolates the cathode from the rest the bioelectrochemical system and can make the defined culture of cathodophilic microorganisms less susceptible to contamination. Even more so, because the reducing equivalents are essentially delivered to cathodophilic microorganisms sterile in the form of electrons delivered by the cathode and originally coming from the anode.
  • Torres et al. (Torres et al., Environ. Sci. Technol., 2008, 42, 8773-8777) presented a method to decrease the pH difference between the anode and the cathode of a microbial fuel cell by having an anion exchange membrane between the cathode chamber and dosing carbon dioxide to an air cathode (platinum catalyst for oxygen reduction).
  • This carbon dioxide reacts with the hydroxyl ions and forms carbonate species. While this decreases the pH of the cathode, the carbonate species also migrate across the anion exchange membrane from cathode to anode and increase pH in the latter. As a result, the pH difference between both is decreased.
  • the present invention provides a process for producing one or more chemical compounds comprising the steps of providing a bioelectrochemical system having an anode and a cathode separated by a membrane, the anode and the cathode being electrically connected to each other, causing oxidation to occur at the anode and causing reduction to occur at the cathode to thereby produce reducing equivalents at the cathode, providing the reducing equivalents to a culture of microorganisms, and providing carbon dioxide to the culture of microorganisms, whereby the microorganisms produce the one or more chemical compounds, and recovering the one or chemical compounds.
  • the present invention provides a process for producing one or more chemical compounds comprising the steps of providing a bioelectrochemical system having an anode and a cathode separated by a membrane, the anode and the cathode being electrically connected to each other, the system having a cathode compartment and the cathode compartment being provided with microorganisms that form the one or more chemical compounds in the cathode compartment, causing oxidation to occur at the anode and causing reduction to occur at the cathode, wherein carbon dioxide is supplied to the cathode compartment, and the microorganisms produce the one or more chemical compounds, and recovering the one more chemicals from the cathode compartment.
  • the system further includes a power supply in the electrical circuit.
  • the power supply may comprise a DC power supply, such as a battery or a DC to AC converter.
  • the power supply can be used to apply a voltage on the system, which increases chemical production rates.
  • the voltage applied with a power supply between the anode and the cathode may be between 0 and 10 V, preferably between 0 and 1.5 V, more preferably between 0 and 1.0 V.
  • a volumetric current density in the bioelectrochemical cell of between 0 and 10,000 A/m 3 of bioelectrochemical cell, preferably between 10 and 5,000 A/m 3 of bioelectrochemical cell, more preferably between 100 and 2500 A/m 3 of bioelectrochemical cell and/or an area specific current density of between 0 and 1 ,000 A/m 2 membrane surface area, preferably between 1 and 100 A/m 2 membrane surface area, more preferably between 2 and 25 A/m 2 membrane surface area.
  • the microorganisms present in the cathode compartment or receiving reducing equivalents from the cathode compartment utilise reducing equivalents produced at the cathode and carbon dioxide to make organic molecules. Therefore, the carbon dioxide acts as a carbon-containing feed material to the microorganisms that receive reducing equivalents from the cathode or are present in the cathode compartment. Indeed, the carbon dioxide can be the only carbon-containing feed component supplied to the microorganisms. In other embodiments, the carbon dioxide is used in conjunction with other organic materials by the microorganisms to produce the desired chemicals. Examples of suitable microorganisms in this regard include chemolithoautotrophic bacteria. For example, in butanol formation, chemolithoautotrophic bacteria at the cathode would proceed according to:
  • the microorganisms provided to the cathode compartment or receiving reducing equivalents from the cathode compartment comprise a defined microbial culture containing one or more selected microbial species.
  • the defined microbial culture comprises a pure microbial culture containing a single species of microorganisms.
  • the defined microbial culture comprises a co-culture of two or more carefully selected microbial species. The microbial species are selected such that the one or more chemical compounds are produced by the microbial species. Suitably, the microbial species do not form methane in notable quantities when grown in the cathode.
  • the defined microbial culture containing one or more selected microbial species may be formed or selected by any technique known to be suitable to persons skilled in the art.
  • an essentially "pure” microbial culture is provided (either in the cathode compartment or to receive reducing equivalents from the cathode).
  • the essentially "pure” microbial culture is selected such that the microbial culture produces the one or more desired chemical compounds.
  • Clostridium carboxidivorans sp. nov. could be selected for the production of acetate, ethanol, butyrate and butanol from carbon dioxide and cathodically produced hydrogen (Liou et al., Int. J. Syst. Evol. Microbiol., 2005, 55, 2085-2091).
  • any feed streams to the culture of microorganisms should be essentially free of other microorganisms.
  • the carbon dioxide stream fed to the culture of microorganisms should also free of contaminating microorganisms.
  • the carbon dioxide stream being fed to be cathode compartment may be derived from an offgas stream or a flue gas stream from a burner or a boiler. It will be appreciated that such offgas streams or flue gas streams exit the burner or boiler at a very high temperature and, as a result, will be essentially sterile (in that they will not contain any contaminating microorganisms). These streams may simply be cooled and then used as a carbon dioxide containing feed stream to the cathode compartment. If the offgas stream or flue gas stream contains other material that may be toxic to the microorganisms in the cathode compartment, that other material should be removed therefrom prior to feeding to the cathode compartment. It will be appreciated that only part of the offgas stream or flue gas stream may be fed to the cathode compartment.
  • the carbon dioxide stream being fed to the cathode compartment may also be biogas, containing a mixture of methane and carbon dioxide (and potentially other gases)
  • the carbon dioxide being fed to the cathode may also be derived from a coal seam or layer, in which carbonate rich fluid is pumped from the coal seam through the cathode compartment.
  • the microorganisms provided to the cathode compartment comprised a mixed, non-selected culture and the process further comprises the steps of producing the one or more chemicals in the cathode compartment and recovering the one or more chemicals from the cathode compartment whilst suppressing formation of methane in the cathode compartment.
  • mixed, non-selected cultures typically contain methanogenic organisms and, if the cathode compartment is operated without special precautions, the final product from the cathode compartment is likely to be methane. Therefore, in this embodiment, the cathode compartment is operated such that methane formation is suppressed. Methane formation may be suppressed by one or more of the following:
  • BES 2-bromoethane sulfonate
  • Other chemicals that suppress the activity of methanogenic organisms may also be used.
  • the CO 2 is provided to the cathode compartment via diffusion or transport from the anode of the bioelectrochemical system. This transport can occur either through the membrane separating anode and cathode, or via an additional conduit.
  • the present invention may be operated with a bioanode and a biocathode.
  • the anode is operated as a bioanode
  • one of the products likely to be formed in the bioanode compartment is carbon dioxide. This carbon dioxide may be used as a feed to the cathode compartment. This carbon dioxide can for example separated from the anode effluent and subsequently transported to the cathode.
  • a waste stream such as a wastewater stream
  • a wastewater stream may be used as a feed material to the anode.
  • the anode reaction is then catalyzed by microorganisms, such as electrochemically active microorganisms, and generates electrons (e ) and protons and/or carbon dioxide and/or other oxidation products (e.g. sulfur):
  • the anode may be located in an anode compartment, with the anode compartment being separated from the cathode compartment by a membrane.
  • organic and/or inorganic components in the waste stream are oxidised to liberate electrons which, in turn, flow through the electrical connection to the cathode.
  • an anion exchange membrane separates the anode compartment from the cathode compartment.
  • Anion exchange membranes are known to the person skilled in the art and include membranes such as AMI-7001 (Membranes International), Neosepta AMX (ASTOM Corporation), and fumasep FAA® (fumatech).
  • bicarbonate ions form in the cathode compartment and subsequently move through the anion exchange membrane to the anode compartment.
  • pH control in the cathode compartment is also obtained by adding carbon dioxide to the cathode compartment.
  • the carbon dioxide acts as a feed material as a building block for producing the chemical compounds and also acts to control pH in the cathode compartment.
  • hydroxyl ions can be generated by the reactions occurring at the cathode.
  • the hydroxyl ions can react with the carbon dioxide to form bicarbonate ions and the bicarbonate ions can subsequently pass through the anion exchange membrane.
  • an undesirable increase in pH in the cathode compartment (which has the potential to kill the culture of microorganisms) can be avoided and homeostatic conditions can be maintained in the cathode compartment.
  • Carbon dioxide dosing does not significantly increase salt concentrations in the cathode compartment. This is advantageous as it will mean that a homeostatic situation can be achieved in the bioelectrochemical system.
  • the membrane separating the anode and the cathode comprises a porous membrane.
  • the porous membrane may allow liquid and ions to pass therethrough but prevent microorganisms from passing therethrough.
  • the anode may be operated as a bioanode, and a waste stream, such as a wastewater stream may be used as a feed material to the anode.
  • the pore size in the porous membrane may be small enough to prevent microorganisms from passing through the membrane.
  • These membranes are known to the person skilled in the art and include microf ⁇ ltration and ultrafiltration membranes.
  • the present invention may be operated with a biocathode only.
  • the anode may comprise an essentially conventional anode.
  • an acid solution e.g. sulfuric acid
  • the anode reaction may be a proton generating reaction (e.g. oxygen generation from water).
  • the membrane may comprise a cation exchange membrane.
  • Cation exchange membranes are known to the person skilled in the art and include membranes such as CMI-7000 (Membranes International), Neosepta CMX (ASTOM Corporation), fumasep® FKB (Fumatech), and Nafion (DuPont).
  • protons migrate through the cation exchange membrane and react with the hydroxyl ions generated in the cathode reaction.
  • no acid needs to be dosed in the cathode compartment the pH and salt concentration in the cathode chamber remain stable and homeostasis is maintained.
  • the electrical current used to provide the reduction in the cathode is derived from a photo-anode.
  • Photo-anodes are known to persons skilled in the art and capture sunlight and transfers the reducing power to the electrical circuit.
  • the electrical current provided to drive the biochemicals production is derived from a renewable power source such as solar power, hydro-power, or others as known to a person skilled in the art.
  • the membrane separating the anode and the cathode comprises a bipolar membrane.
  • Bipolar membranes are known to persons skilled in the art and include membranes such as NEOSEPTA BP-IE (ASTOM Corporation) and fumasep® FBM (Fumasep).
  • Bipolar membranes are composed of a cation exchange layer on top of an anion exchange layer and rely on the principle of water splitting into protons and hydroxyl ions in between the ion exchange layers of the membrane, according to equation (5):
  • the anion exchange layer is directed towards the anode chamber and the cation exchange layer is directed towards the cathode chamber.
  • water diffuses in between the ion exchange layers of the bipolar membrane and is split into protons and hydroxyl ions.
  • the hydroxyl ions migrate through the anion exchange layer into the anode chamber, where they compensate for the proton production in the anode reaction equation (3) and the protons migrate through the cation exchange layer into the cathode chamber where they compensate for the hydroxyl ion production (or proton consumption) in the cathode reaction.
  • no acid needs to be dosed in the cathode compartment and the pH and salt concentration in the cathode chamber remain stable, maintaining homeostasis.
  • the effluent of the anode may be sent to, for example, a stripping column or membrane unit to recover gaseous carbon dioxide.
  • This carbon dioxide can be provided to the cathode as a gas.
  • effluent from the anode can be passed through a membrane unit to allow separation of carbon dioxide from the anode effluent, the membrane unit having a liquid flow on the other side of the membrane.
  • the separated carbon dioxide can go into solution in the fluid on the other side of the membrane.
  • the carbon dioxide can be provided to the cathode in dissolved form.
  • the fluid passing through the membrane unit on the other side of the anode fluid can be cathode fluid.
  • the anode effluent can be sent through a membrane unit to allow carbon dioxide together with organic constituents of the anode effluent to pass to a second liquid.
  • effluents from fermentation reactors can be sent through an anode, the effluent of the anode can be sent to a membrane unit where aside from the carbon dioxide fatty acids such as propionate, butyrate and others as known to a person skilled in the art pass through the membrane and become captured in a second fluid. This fluid can be sent to the cathode where reduction of the organics can occur.
  • both carbon dioxide and the other organic materials provide feed material for the microorganisms to convert into the desired chemical products.
  • the cathode is also provided with organic molecules to assist in the production of the biochemicals.
  • organic molecules are glycerol, glucose, lactate, butyrate, and others known to a person skilled in the art. These compounds can be added to provide the microorganisms with a source for adenosyl triphosphate (ATP) formation, which facilitates microbial growth and product formation.
  • ATP adenosyl triphosphate
  • the product formation may include 1,3-propanediol or butanol.
  • Glycerol may be added to the cathode compartment, to the anode compartment or to both. Glycerol can also be (partially) converted to propionate prior to entry in the bioelectrochemical system, and subsequently be added to the cathode as a mixture of glycerol and propionate.
  • the microorganisms in the cathode compartment are genetically engineered to receive electrons from the cathode.
  • modifications include the addition of hydrogenases, cytochromes, sortases and other enzyme complexes to the cell.
  • the cathode can be provided with conductive structures, such as nanowires, to electrically connect microorganisms with the cathode.
  • redox mediators can be added to the cathode fluid, allowing transport of electrons from the cathode to the microorganism.
  • redox mediators are methyl viologen, neutral red, phenazine carboxamide, amido black and others as known to a person skilled in the art.
  • the redox shuttles allow in certain embodiments to increase the ratio NADH/NAD + inside the microbial cell, which drives the production of reduced molecules.
  • a mixture of desirable chemicals may be formed in the cathode compartment.
  • the present invention further comprises the steps of removing a mixture of chemical compounds from the cathode compartment and separating the mixture of chemical compounds into two or more streams.
  • the mixture of chemical compounds may be separated using known separation techniques, such as ion exchange, liquid-liquid extraction, absorption, absorption, gas stripping, distillation, reverse osmosis, membrane separation, cryogenic separation, or indeed any other separation technique known to be suitable to a person skilled in the art.
  • one or more of the chemical compounds may be reacted to form another chemical compound that is more susceptible to removal from the remaining chemical compounds.
  • one or more of the chemical compounds formed in the cathode compartment may comprise a solid compound.
  • any suitable solid/liquid separation technique may be used, including centrifugation, filtration, settling, clarification, flotation, or the like.
  • one or more of the chemical compounds formed in the cathode compartment may comprise a gaseous compound.
  • product can conveniently be collected with a gas collection device, such as a gas-liquid separator, as known to a person skilled in the art.
  • the cathode compartment is filled with the microbial culture.
  • the microbial culture is typically part of an aqueous mixture in the cathode compartment.
  • the microbial culture grows on the electrode surface.
  • the cathode compartment is filled with part of the microbial culture and another part of the microbial culture grows on the electrode surface.
  • the cathode compartment may comprise a first compartment housing the cathode, the first compartment including a redox shuttle, and a second compartment containing one or more microorganisms, wherein the redox shuttle is reduced in the first compartment and a reduced redox shuttle is provided to the second compartment, the second compartment containing microorganisms that use the reduced redox shuttle as an electron donor to facilitate formation of the one more chemicals.
  • the reduced redox shuttle is converted to an oxidised redox shuttle in the second compartment.
  • the oxidised redox shuttle may be returned to the first compartment.
  • Examples of chemical compounds that can be formed using the present invention include:
  • - alcohols such as methanol, ethanol, propanol, butanol, isobutanol etc.
  • carboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, lactic acid, etc.
  • Figure 1 shows a schematic view of a bioelectrochemical system suitable for use in embodiments of the present invention
  • Figure 2 shows a schematic diagram of apparatus suitable for use in another embodiment of the present invention
  • Figure 3 shows a schematic diagram of apparatus suitable for use in a further embodiment of the present invention.
  • Figure 4 shows a schematic diagram of apparatus suitable for use in a further embodiment of the present invention.
  • the bioelectrochemical system 10 shown in figure 1 includes an anode compartment 12 and a cathode compartment 14.
  • the anode compartment 12 includes an anode 16.
  • the cathode compartment 14 includes a cathode 18.
  • the anode and the cathode are in electrical connection with each other via an electrical circuit 20 that contains a power supply 22.
  • the anode compartment 12 is separated from the cathode compartment 14 by an anion exchange membrane 24.
  • the cathode compartment 14 contains a microbial culture (shown schematically in Figure 1 as ovals or circles 17 and 19).
  • the microbial culture comprises a defined culture.
  • a defined microbial culture of cathodophilic microorganisms should be a carefully selected or genetically engineered pure culture, but could also be a carefully selected co-culture of two or more carefully selected or genetically engineered pure cultures. These pure cultures or co-cultures should consist of microbial species that are capable of catalyzing the production reaction of the desired complex molecule.
  • the microbial culture in the cathode compartment 14 is contained in an aqueous medium (see reference numeral 17) and/or attached to the cathode (see reference numeral 19).
  • the cathode compartment 14 is provided with a gas inlet 26 and a gas outlet 28.
  • a carbon dioxide containing stream is fed into the gas in 26 and excess gas is removed through gas outlet 28.
  • the carbon dioxide containing stream that is fed to the cathode compartment is a sterile carbon dioxide containing stream in that it contains no contaminating microorganisms.
  • One possible source of such a carbon dioxide containing stream is an offgas stream from a boiler or a furnace. Such an offgas stream leaves the boiler or furnace that elevated temperatures and therefore contained no microorganisms (and microorganisms would be killed by the high temperatures encountered in the offgas stream).
  • the offgas stream may be cooled (in a manner which does not introduce any contaminating bacteria into the gas stream, such as by using indirect heat exchange) and subsequently be fed to the cathode compartment 14.
  • FIG. 2 shows a schematic view of an alternative apparatus suitable for use in the present invention.
  • the apparatus shown in figure 2 includes an anode compartment 112 that contains an anode 1 16.
  • the apparatus also includes a cathode compartment 114 that contains a cathode 1 18.
  • a membrane 124 separates the cathode compartment from the anode compartment.
  • An electrical circuit 120 that includes a power supply 122 (in the form of a DC power supply, such as a battery or an AC to DC converter) electrically connects the anode 116 to cathode 1 18.
  • a power supply 122 in the form of a DC power supply, such as a battery or an AC to DC converter
  • the apparatus also includes a separate vessel 130.
  • the vessel 130 has an inlet 132 in which carbon dioxide and oxygen or an oxygen containing gas can be supplied.
  • the oxygen and carbon dioxide can be transferred via line 134 to compartment 114.
  • Line 136 returns fluid and excess gas to the vessel 130.
  • the vessel 130 may also be provided with an aqueous medium and the carbon dioxide and oxygen may dissolve into the aqueous medium, with the aqueous medium containing dissolved carbon dioxide and oxygen being transferred to the cathode compartment 114.
  • FIG. 3 shows a schematic view of another apparatus suitable for use in embodiments of the present invention.
  • the apparatus shown in figure 3 includes an anode compartment 212 that contains an anode 216.
  • the apparatus also includes a cathode compartment 214 that contains a cathode 218.
  • a membrane 224 separates the cathode compartment from the anode compartment.
  • An electrical circuit 220 that includes a power supply 222 (in the form of a DC power supply, such as a battery or an AC to DC converter) electrically connects the anode 216 to the cathode 218.
  • a power supply 222 in the form of a DC power supply, such as a battery or an AC to DC converter
  • the apparatus shown in figure 3 also includes a further vessel 230.
  • the vessel 230 has an inlet 232 for admitting carbon dioxide to the vessel 230.
  • a redox shuttle is reduced in the cathode compartment 214.
  • the reduced redox shuttle is supplied via line 236 to the external compartment 230.
  • a culture of microorganisms in the vessel 230 uses the reduced redox shuttle as an electron donor for the reduction of carbon dioxide.
  • the oxidised redox shuttle is then returned to the cathode compartment 214 via line 238.
  • Figure 4 shows a schematic view of another apparatus suitable for use in embodiments of the present invention.
  • the apparatus shown in figure 4 includes an anode compartment 312 that contains an anode 316.
  • the apparatus also includes a cathode compartment 314 that contains a cathode 318.
  • a membrane 324 separates the cathode compartment from the anode compartment.
  • An electrical circuit 320 that includes a power supply 322 electrically connects the anode 316 to cathode 318.
  • the apparatus also includes a vessel 330 that has an inlet 332 for supplying oxygen (and additional carbon dioxide, if required) thereto.
  • Line 350 transfers oxygen and carbon dioxide to the cathode compartment 314 and line 352 returns excess oxygen and carbon dioxide to vessel 330.
  • the oxygen and carbon dioxide may be transferred as gaseous streams or dissolved in liquid streams.
  • the reaction is taking place at the anode produce carbon dioxide in the anode compartment 312.
  • An outlet 340 from the anode compartment removes aqueous liquid containing carbon dioxide from the anode compartment and passes it to a stripping column 342.
  • carbon dioxide is separated from the aqueous liquid.
  • the aqueous liquid is returned to the anode compartment 312 via line 344.
  • the stripped carbon dioxide is transferred via line 346 to inlet 334 of vessel 330.
  • the carbon dioxide and oxygen in the vessel 330 is transferred to cathode compartment 314, where a selected culture of microorganisms converts the carbon dioxide into other chemical compounds.
  • This embodiment is advantageous in that carbon dioxide that forms at the anode is captured and used as a feed to the cathode compartment, thereby reducing carbon dioxide emissions.
  • Example 1 Biopolymer production
  • bacteria in the cathode chamber use carbon dioxide and electrons from the cathode as energy and carbon source, in which case they can produce biopolymer under the form of poly- ⁇ -hydroxybutyrate (PHB).
  • the CO 2 is provided in a way that a pure culture or a defined mixture of bacteria can be maintained.
  • Oxygen is supplied to support the PHB synthesis.
  • the electrons reach the bacteria either directly or indirectly through e.g. the production of hydrogen at the cathode.
  • An external power source can provide the required additional reducing power at the cathode, if required
  • Example organism in the cathode Cupriavidus necator (formerly Alcaligenes eutrophus or Ralstonia eutroph ⁇ )
  • Example 2 Indirect provision of reducing power to biochemicals producing organisms
  • the apparatus as shown in figure 3 is used and a redox shuttle is reduced in the cathode compartment.
  • the reduced redox shuttle is brought to the external compartment (possibly through a permeable membrane) where micro-organisms use the reduced redox shuttle as electron donor for the reduction of an electron acceptor, being CO 2 , and the production chemicals from this CO 2 .
  • An external power source can provide the required additional reducing power at the cathode, if required
  • Example 3 Reuse of CO 2 produced at the anode to drive the cathodic reaction. This example is conducted in the apparatus as shown in Figure 4.
  • the anode contains micro-organisms that oxidize a carbon source.
  • the CO 2 produced is stripped in situ, or in an external stripping reactor, and hence brought to the cathode compartment in such way that the cathode compartment can contain a well defined culture or mixed culture of micro-organisms to form the desired chemicals.
  • the present invention presents a cathode system for producing complex molecules using microbial biocathodes prevents the abovementioned problems associated with the contamination of unwanted micro-organisms and/or cathode chamber pH increase and/or salinity increase.

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Abstract

La présente invention concerne un procédé de production d'un ou plusieurs composés chimiques qui consiste à se procurer un système bioélectrochimique comportant une anode et une cathode séparées par une membrane et reliées électriquement l'une à l'autre, provoquer une oxydation à l'anode et une réduction à la cathode pour produire ainsi des équivalents réducteurs au niveau de la cathode, apporter ces équivalents réducteurs ainsi que du dioxyde de carbone à une culture de micro-organismes pour que ces derniers produisent ledit ou desdits composés chimiques, et récupérer ces composés.
PCT/AU2009/001645 2008-12-18 2009-12-17 Procédé de production de composés chimiques WO2010068994A1 (fr)

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US13/140,947 US20110315560A1 (en) 2008-12-18 2009-12-17 Process for the production of chemicals
BRPI0923180A BRPI0923180A2 (pt) 2008-12-18 2009-12-17 processo para a produção de produtos químicos
EP20090832723 EP2373832A1 (fr) 2008-12-18 2009-12-17 Procédé de production de composés chimiques
AU2009328649A AU2009328649A1 (en) 2008-12-18 2009-12-17 Process for the production of chemicals
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