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EP1670582A1 - Procede de preparation d'un catalyseur pour l'oxydation en phase gazeuse par revetement d'un support dans un lit fluidise - Google Patents

Procede de preparation d'un catalyseur pour l'oxydation en phase gazeuse par revetement d'un support dans un lit fluidise

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Publication number
EP1670582A1
EP1670582A1 EP04765591A EP04765591A EP1670582A1 EP 1670582 A1 EP1670582 A1 EP 1670582A1 EP 04765591 A EP04765591 A EP 04765591A EP 04765591 A EP04765591 A EP 04765591A EP 1670582 A1 EP1670582 A1 EP 1670582A1
Authority
EP
European Patent Office
Prior art keywords
gas
suspension
catalyst
susp
carrier
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04765591A
Other languages
German (de)
English (en)
Inventor
Samuel Neto
Wolfgang Rummel
Sebastian Storck
Jürgen ZÜHLKE
Frank Rosowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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 DE10344844A external-priority patent/DE10344844A1/de
Priority claimed from EP04003444A external-priority patent/EP1563905A1/fr
Application filed by BASF SE filed Critical BASF SE
Priority to EP04765591A priority Critical patent/EP1670582A1/fr
Publication of EP1670582A1 publication Critical patent/EP1670582A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/20—Vanadium, niobium or tantalum
    • B01J23/22—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/19—Catalysts containing parts with different compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/391—Physical properties of the active metal ingredient
    • B01J35/395—Thickness of the active catalytic layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • B01J37/0221—Coating of particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • B01J37/0232—Coating by pulverisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • B01J37/0244—Coatings comprising several layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/34—Mechanical properties
    • B01J35/38—Abrasion or attrition resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/613—10-100 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst

Definitions

  • benzoic acid maleic anhydride, phthalic anhydride, isophthalic acid, terephthalic acid or pyromellitic anhydride.
  • a mixture of an oxygen-containing gas and the starting material to be oxidized is passed through pipes in which there is a bed of catalyst.
  • the tubes are surrounded by a heat transfer medium, for example a molten salt.
  • shell catalysts in which the catalytically active composition is applied in a shell-like manner to an inert support material, such as steatite, have proven to be useful as catalysts for these oxidation reactions.
  • Different catalytically active materials can be applied in one or more shells.
  • vanadium pentoxide is generally used as the catalytically active component of the catalytically active composition of these coated catalysts.
  • the catalytically active composition can contain a large number of other oxidic compounds in small amounts, which as promoters influence the activity and selectivity of the catalyst.
  • an aqueous suspension of the active composition constituents and / or their precursor compounds or sources is sprayed onto the support material at elevated temperature until the desired proportion of active composition in the total catalyst weight is reached, e.g. DE-A 40 06 935.
  • the carrier material is fluidized in an ascending gas stream, in particular air.
  • the devices usually consist of a conical or spherical container, in which the fluidizing gas is introduced from below or from above via a central tube. The suspension is sprayed from above, from the side or from the nozzle
  • a suitable fluid bed apparatus is described for example in DE-A 40 06 935.
  • organic binders preferably copolymers, advantageously in the form of an aqueous dispersion, of vinyl acetate / vinyl laurate, vinyl acetate / acrylate, styrene / acrylate and vinyl acetate / ethylene to the suspension.
  • the addition of binder also has the advantage that the active composition adheres well to the support, so that the catalyst can be transported and filled in more easily.
  • the binder escapes from the applied layer through thermal decomposition and / or combustion.
  • the thermal treatment is usually carried out in situ in the oxidation reactor.
  • the quality of the supported catalysts obtainable in this way depends crucially on the operating parameters of the fluidized bed apparatus, in particular on the total mass of the carrier material in the apparatus, the binder content of the sprayed-in suspension, the flow rate and the temperature of the gas stream blown in for swirling and Dosing rate at which the suspension is sprayed onto the fluidized inert carrier.
  • the most important operating parameters of the fluid bed apparatus for coating the carrier materials are set by means of complex empirical test series, which must already be carried out on a production scale, since scaling from the laboratory or pilot plant scale to the production scale is practically impossible due to the lack of or inadequate theoretical models.
  • WO 98 14274 describes a process for producing a supported catalyst in a fluidized bed apparatus, in which a less thin 100 ⁇ m layer of an active composition is applied in aqueous suspension to an inert support of 5 ⁇ m to 20 mm diameter.
  • WO 02 096557 describes a process for the production in a fluidized bed apparatus of supported metallic nanoparticles as catalysts.
  • US 4 977 126 describes a process for the production of supported catalysts in a fluidized bed apparatus, in which the catalysts consist of a metallic cobalt layer on oxide supports.
  • FR 2791 905 describes a process for producing supported catalysts in which the suspension consists of fine particles with a diameter of 10-100 ⁇ m and a density of more than 1000 kg / m 3 and about 30% larger particles with a diameter of 0.4-1 mm contained.
  • the invention relates to a process for the preparation of a catalyst for gas phase oxidation, in which a particulate inert carrier of a total mass M ⁇ ra g er is weighed into a fluidized bed apparatus, at least one aqueous suspension of a catalytically active material or sources for it and binders with a binder content B Susp are provided, the inert carrier by supplying a fluidized heated to a temperature T opp gas stream at a flow rate Q gas, and spraying the suspension at a rate Q Susp onto the fluidized inert carrier.
  • one chooses Q Gas , Qsusp, B S u SP , M Trager , and T Ggs within the ranges 3000 ⁇ Q Gas [m 3 / h] ⁇ 9000, 1000 ⁇ Q Susp [g / min] ⁇ 3500, 2 ⁇ Bsusp [wt. %] ⁇ 18, 60 ⁇ M carrier [kg] ⁇ 240. 75 ⁇ 7 gas [° C] ⁇ 120 such that a parameter K, which is defined as K 0.020 Q gas - 0.055 Q susp + 7.500 ß Süsp - 0.667 M carrier + 2.069 T gas - 7 with the relation 127, 5 ⁇ K ⁇ 202 is sufficient.
  • the mechanical stability of the layer on the carrier is also improved.
  • the layer (s) of the coated catalyst are applied, for example, by spraying a suspension of TiO 2 and V 2 O 5 , which may contain sources of the promoter elements mentioned below, onto the fluidized support.
  • the catalytically active composition preferably contains 1 to 40 in the calcined state, based on the total amount of the catalytically active composition % By weight of vanadium oxide, calculated as V 2 O 5 , and 60 to 99% by weight of titanium dioxide, calculated as TiO 2 .
  • Suitable starting compounds for the element vanadium are, for example, vanadium oxides such as vanadium pentoxide (V 2 O 5 ), vanadates such as ammonium rnetavanadate, vanadium oxysulfate hydrate, vanadyl acetate tylacetonate, vanadium halides such as vanadium tetrachloride (VCI 4 ) and vanadium oxyhalogenides such as VOCI 3 .
  • vanadium oxides such as vanadium pentoxide (V 2 O 5 )
  • vanadates such as ammonium rnetavanadate
  • vanadium oxysulfate hydrate vanadyl acetate tylacetonate
  • vanadium halides such as vanadium te
  • the vanadium starting compounds used can also be those which contain vanadium in oxidation state +4 or which contain vanadium in oxidation state +5 and various reducing agents (for example NH 4 + or its decomposition product NH 3 ), the V 5+ can reduce to V 4+ .
  • a reducing agent can also be oxalic acid, oxalate, hydrazine dihydrochloride, hydrazine sulfate, hydrazine (monohydrate), hydroxylamine, hydroxylamine hydrochloride or their salts.
  • the catalytically active composition can also contain up to 1% by weight of a cesium compound, calculated as Cs, up to 1% by weight of a phosphorus compound, calculated as P and up to 10% by weight of antimony oxide, calculated as Sb 2 O 3 ,
  • the catalytically active composition can in principle contain a small number of other oxidic compounds which, as promoters, influence the activity and selectivity of the catalyst, for example by reducing or increasing its activity.
  • promoters are the alkali metal oxide, in particular in addition to the cesium oxide, lithium, potassium and rubidium oxide, thallium (l) oxide, aluminum oxide, zirconium oxide, iron oxide, nickel oxide, cobalt oxide, manganese oxide, tin oxide, silver oxide, copper oxide, chromium oxide, Molybdenum oxide, tungsten oxide, iridium oxide, tantalum oxide, Ni oboxid, arsenic oxide, cerium oxide called.
  • cesium from this group is used as a promoter.
  • the oxides of niobium and tungsten in amounts of from 0.01 to 0.50% by weight, based on the catalytically active composition, are also preferred as additives.
  • Oxidic phosphorus compounds, in particular phosphorus pentoxide, are particularly suitable as an activity-increasing but selectivity-reducing additive.
  • the suspension Before coating, the suspension is preferably stirred for a sufficiently long time, for example 2 to 30 hours, in particular 12 to 25 hours, in order to break up agglomerates of the suspended solids and to obtain a homogeneous suspension.
  • the suspension typically has a solids content of 20 to 50% by weight.
  • the suspension medium is generally aqueous, e.g. B. water itself or an aqueous mixture with a water-miscible organic solvent, such as methanol, ethanol, isopropanol, formamide and the like.
  • first or second suspension of TiO 2 and V 2 O 5 particles as catalyst particles preferably have at least 90 % By volume of the V 2 O 5 particles have a diameter of 20 ⁇ m or less and at least 95% by volume of the V 2 O 5 particles have a diameter of 30 ⁇ m or less.
  • organic binders preferably copolymers, advantageously in the form of an aqueous dispersion, of vinyl acetate / vinyl laurate, vinyl acetate / acrylate, styrene / acrylate and vinyl acetate / ethylene are added to the suspension.
  • the binders are commercially available as aqueous dispersions with a solids content of e.g. B. 35 to 65 wt .-%. According to the invention, the amount of such binder dispersions used is 2 to 18% by weight. based on the weight of the suspension.
  • coating temperatures of 75 to 120 ° C. are used according to the invention, it being possible for the coating to be carried out under atmospheric pressure or under reduced pressure.
  • the layer thickness of the catalytically active composition is generally 0.02 to 0.25 mm, preferably 0.05 to 0.20 mm.
  • the active mass fraction of the catalyst is usually 5 to 25% by weight, usually 7 to 15% by weight.
  • the binder escapes from the applied layer by thermal decomposition and / or combustion.
  • the thermal treatment is preferably carried out in situ in the gas phase oxidation reactor.
  • the characteristic number is preferably in a range from 136.0 ⁇ K ⁇ 193.5 and there are 4500 ⁇ Q gas [m 3 / h] ⁇ 7500, 1500 ⁇ Q Susp [g / min] ⁇ 3000, 5 ⁇ B Susp [ % By weight] ⁇ 15, 100 ⁇ M mger [kg] ⁇ 200, and 80 ⁇ 7 gas [° C] ⁇ 115.
  • the characteristic number is particularly preferably in a range from 143 ⁇ K ⁇ 184.5 and there are 5500 ⁇ Q gas [m 3 / h] ⁇ 6500, 2000 ⁇ Q Susp [g / min] ⁇ 2500, 6 ⁇ B susp [ % By weight] ⁇ 11 120 ⁇ M carrier [kg] ⁇ 180, 90 ⁇ T gas [° C] ⁇ 115.
  • any gas or gas mixture which is inert under the operating conditions can be used for swirling and tempering the bed of carrier material in the fluidized bed apparatus.
  • the gas supplied is air, which enables the system to be operated particularly cost-effectively.
  • the catalytically active composition can also be applied in two or more layers.
  • the layers preferably have different selectivity and activity.
  • the inner layer or the inner layers can have an antimony oxide content of up to 15% by weight and the outer layer can have an antimony oxide content reduced by 50 to 100%.
  • the inner layer and outer layer can contain different amounts of P.
  • two layers are provided with a second aqueous suspension of catalytically active material and binder and sprayed onto the fluidized carrier coated with the first suspension.
  • carrier materials of the prior art such as are advantageously used in the production of coated catalysts for the oxidation of aromatic hydrocarbons to aldehydes, carboxylic acids and / or carboxylic acid anhydrides
  • inert carrier material for example quartz (SiO 2 ), porcelain, Magnesium oxide, tin dioxide, silicon carbide, rutile, alumina (Al 2 O 3 ), aluminum silicate, steatite (magnesium silicate), zirconium silicate, cerium silicate or mixtures of these carrier materials.
  • the carrier material is usually non-porous.
  • non-porous is to be understood in the sense of "except for technically ineffective amounts of pores non-porous", since technically inevitably a small number of pores can be present in the carrier material, which ideally should not contain any pores.
  • Steatite and silicon carbide are particularly worth mentioning as advantageous carrier materials.
  • the shape of the support material is generally not critical for the precatalysts and coated catalysts according to the invention.
  • catalyst supports in the form of spheres, rings, tablets, spirals, tubes, extrudates or grit can be used.
  • the dimensions of these catalyst carriers correspond to those of the catalyst carriers usually used for the production of shell catalysts for the gas phase partial oxidation of aromatic hydrocarbons.
  • Steatite in the form of balls with an outer diameter of 0.5 to 10 mm or rings with an outer diameter of 3 to 15 mm is preferably used.
  • the process according to the invention is particularly preferably carried out in a fluidized bed apparatus which has a container for receiving the particulate carrier, in the lower region of which a bowl-like depression is provided, a central tube for supplying the gas, which extends essentially axially downward in the container opens into the recess, a substantially ring-shaped deflector screen, which is fastened to the central tube in the upper region of the container, and a guide ring arranged in the lower region of the container, which surrounds the central tube substantially concentrically over part of its length, and means for spraying the first and optionally the second suspension.
  • a fluid bed apparatus is described, for example, in German patent application DE 4006935.
  • Commercially available fluid bed apparatuses which are suitable for carrying out the process according to the invention are, for example, the ball coaters HKC 150 and HKC 200 from Hüttlin, Steinen, Germany.
  • the catalysts according to the invention are generally suitable for the gas phase oxidation of aromatic C 6 to C 10 hydrocarbons, such as benzene, the xylenes, toluene, naphthalene or durol (1,2,4,5-tetramethylbenzene) to carboxylic acids and / or carboxylic anhydrides such as maleic anhydride, phthalic anhydride , Benzoic acid and / or pyromellitic dianhydride.
  • the invention therefore also relates to the use of the catalyst prepared by the process according to the invention for the production of phthalic anhydride from o-xylene, naphthalene or mixtures thereof.
  • the catalysts prepared according to the invention are filled into reaction tubes thermostatically controlled from the outside to the reaction temperature, for example by means of molten salt, and the salt bath temperatures are generally from 300 to 450 ° C., preferably from 320 to 420 ° C. and particularly preferably from 340 to 400 ° C and at an overpressure of generally 0.1 to 2.5 bar, preferably 0.3 to 1.5 bar with a space velocity of generally 750 to 5000 h "1.
  • the reaction gas fed to the catalyst is generally generated by mixing a gas containing molecular oxygen, which in addition to oxygen can also contain suitable reaction moderators and / or diluents, such as steam, carbon dioxide and / or nitrogen, with the aromatic hydrocarbon to be oxidized, the molecular oxygen-containing gas in generally 1 to 100 mol%, preferably 2 to 50 mol% and particularly preferably 10 to 30 mol% oxygen, 0 to 30 mol%, preferably 0 to 10 mol% water vapor and 0 to 50 mol%, preferably 0 to 1 mol% carbon dioxide, the rest nitrogen.
  • a gas containing molecular oxygen which in addition to oxygen can also contain suitable reaction moderators and / or diluents, such as steam, carbon dioxide and / or nitrogen
  • the molecular oxygen-containing gas in generally 1 to 100 mol%, preferably 2 to 50 mol% and particularly preferably 10 to 30 mol% oxygen, 0 to 30 mol%, preferably 0 to 10 mol% water
  • the molecular oxygen-containing gas is generally charged with 30 g to 150 g per Nm 3 of gas of the aromatic hydrocarbon to be oxidized. It has proven to be particularly advantageous if catalysts are used in the catalyst bed which differ in their catalytic activity and / or chemical composition of their active composition. Usually, when using two reaction zones in the first reaction zone, i.e. towards the gas inlet of the reaction gas, a catalyst is used which has a somewhat lower catalytic activity compared to the catalyst which is located in the second reaction zone, i.e. towards the gas outlet , In general, the reaction is controlled by the temperature setting in such a way that in the first zone most of the aromatic hydrocarbons contained in the reaction gas are converted with maximum yield. Three- to five-layer catalyst systems are preferably used, in particular three- and four-layer catalyst systems.
  • Binder concentration 10% by weight of the total suspension used
  • the catalytically active composition applied in this way i.e. the catalyst shell, contained 7.12% by weight of vanadium (calculated as V 2 O 5 ), 1.8% by weight of antimony (calculated as Sb 2 O 3 ), 0.33% by weight of cesium (calculated as Cs), 90.75% by weight of titanium dioxide.
  • the weight of the shell applied was 8.0% of the total weight of the finished catalyst.
  • the key figure K which was calculated from the equation of claim 1, is 188.5.
  • the abrasion after a triple drop test was 25% by weight (after 1 h of calcination at 450 ° C.).
  • approx. 50 g of catalyst (calcined after heat treatment at 450 ° C. for one hour) were dropped through a 3 m long tube with an internal diameter of 25 mm. The catalyst falls into a bowl underneath the tube, is separated from the dust generated when it hits the ground, and is dropped again through the tube.
  • the total mass loss after three drop tests with respect to the amount of active mass applied, which corresponds to 100%, is a measure of the abrasion resistance of the catalyst.
  • the catalyst was prepared as in Example 1, the operating conditions of the fluid bed apparatus being set as follows:
  • Binder concentration 10% by weight of the total suspension used
  • the catalyst was prepared as in Example 1, the operating conditions of the fluid bed apparatus being set as follows: Air flow: 6000 m 3 / h
  • the key figure K which was calculated from the equation of claim 1, is 263.5.
  • the catalytically active composition applied in this way i.e. the catalyst shell, consisted on average of 0.15% by weight of phosphorus (calculated as P), 7.5% by weight of vanadium (calculated as V 2 O 5 ), 3, 2% by weight of antimony (calculated as Sb 2 O 3 ), 0.1% by weight of cesium (calculated as Cs) and 89.05% by weight of titanium dioxide.
  • the operating conditions of the fluid bed apparatus were:
  • Air flow 6500 m 3 / h
  • Binder concentration 7.5% by weight of the total suspension used, carrier weight 150 kg steatite rings (8 mm x 6 mm x 5 mm)
  • the characteristic number K which was calculated from the equation in claim 1, is 154.9.
  • the abrasion after a triple drop test (drop test as in Example 1) was 5% by weight (after 1 hour calcination at 450 ° C.).
  • Comparative Example 5 The catalyst was prepared as in Example 4, spraying 19 kg of the suspension and setting the operating conditions of the fluid bed apparatus as follows:
  • Air flow 6500 m 3 / h
  • Binder concentration 7.5% by weight of the total suspension used
  • Carrier weight 50 kg steatite rings (8 mm x 6 mm x 5 mm)
  • the key figure K which was calculated from the equation in claim 1, is 221.6.
  • the catalyst was prepared as in Example 4, the operating conditions of the fluid bed apparatus being set as follows:
  • Air flow 6500 m 3 / h dosing rate: 900 g / min
  • Binder concentration 7.5% by weight of the total suspension used, carrier weight 150 kg steatite rings (8 mm x 6 mm x 5 mm)
  • the key figure K which was calculated from the equation in claim 1, is 229.9.
  • 150 kg of the shell catalyst obtained were heated in a fluidized bed apparatus and with 24 kg of a suspension of 168.35 kg of anatase with a BET surface area of 21 m 2 / g, 7.043 kg of vanadium pentoxide, 19.080 kg of oxalic acid, 0.990 g of cesium sulfate, 238.920 kg of water and 66.386 kg of formamide, together with 37.5 kg of an organic binder consisting of a copolymer of acrylic acid / maleic acid (weight ratio 75:25) sprayed.
  • Air flow 6500 m 3 / h
  • Binder concentration 7.5% by weight of the total suspension used
  • the key figure K which was calculated from the equation in claim 1, is 154.9.
  • the weight of the applied layers was 9.3% of the total weight of the finished catalyst (after heat treatment at 450 ° C. for one hour).
  • the catalytically active composition applied in this way i.e. the catalyst shells, consisted on average of 0.08% by weight of phosphorus (calculated as P), 5.75% by weight of vanadium (calculated as V 2 O 5 ), 1, 6% by weight of antimony (calculated as Sb 2 O 3 ), 0.4% by weight of cesium (calculated as Cs) and 92.17% by weight of titanium dioxide.
  • the abrasion after a triple drop test was 10% by weight (after 1 hour calcination at 450 ° C.).
  • a clamshell catalyst was prepared as in Example 7, the operating conditions of the fluid bed apparatus being set as follows:
  • Air flow 2900 m 3 / h dosing rate: 2250 g / min
  • Binder concentration 7.5% by weight of the total suspension used
  • the key figure K which was calculated from the equation in claim 1, is 82.9.
  • a two-layer catalyst was prepared as in Example 7, the operating conditions of the fluidized bed apparatus being set as follows:
  • Air flow 6500 m 3 / h
  • Binder concentration 7.5% by weight of the total suspension used Weighing in 150 kg steatite rings (8 mm x 6 mm x 5 mm) Supply air temperature: 125 ° C
  • the key figure K which was calculated from the equation in claim 1, is 212.8.

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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

L'invention concerne un procédé de production d'un catalyseur pour oxydations en phase gazeuse. Selon ledit procédé, un support inerte particulaire d'une masse totale MTräger est pesé dans un appareil à lit fluidisé ; au moins une suspension aqueuse d'une matière catalytiquement active ou de sources de cette dernière et de liants, présentant une teneur en liants BSusp, est préparée ; le support inerte est fluidisé par l'apport d'un courant gazeux à une température TGas et à un débit QGas puis la suspension est pulvérisée à un débit de dosage QSusp sur le support inerte fluidisé. La sélection de QGas, QSusp, BSusp, MTräger et TGas dans les plages 3 000 = QGas [m3/h] = 9 000, 2 = BSusp [ % en poids] = 18, 75 = TGas [ DEG C] = 120, 1 000 = QSusp [g/min] = 3 500, 60 = MTräger [kg] = 240, de sorte qu'une caractéristique K, où K = 0,020 QGas - 0,055 QSusp + 7,500 BSusp - 0,667 MTräger + 2,069 TGas - 7, satisfait à la relation 127,5 = K = 202, permet d'obtenir des couches de grande valeur qualitative et d'éviter la formation de macles de particules de support adhérant les unes aux autres.
EP04765591A 2003-09-26 2004-09-24 Procede de preparation d'un catalyseur pour l'oxydation en phase gazeuse par revetement d'un support dans un lit fluidise Withdrawn EP1670582A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04765591A EP1670582A1 (fr) 2003-09-26 2004-09-24 Procede de preparation d'un catalyseur pour l'oxydation en phase gazeuse par revetement d'un support dans un lit fluidise

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10344844A DE10344844A1 (de) 2003-09-26 2003-09-26 Verfahren zur Herstellung eines Katalysators für Gasphasenoxidationen
EP04003444A EP1563905A1 (fr) 2004-02-16 2004-02-16 Procédé de préparation d'un catalyseur pour l'oxydation en phase gazeuse par revêtement d'un support dans un lit fluidisé
PCT/EP2004/010750 WO2005030388A1 (fr) 2003-09-26 2004-09-24 Procede de production d'un catalyseur pour oxydations en phase gazeuse par enduction de supports dans un appareil a lit fluidise
EP04765591A EP1670582A1 (fr) 2003-09-26 2004-09-24 Procede de preparation d'un catalyseur pour l'oxydation en phase gazeuse par revetement d'un support dans un lit fluidise

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EP1670582A1 true EP1670582A1 (fr) 2006-06-21

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US (1) US20070135302A1 (fr)
EP (1) EP1670582A1 (fr)
JP (1) JP4800948B2 (fr)
CN (1) CN1859973B (fr)
BR (1) BRPI0414770A (fr)
RU (1) RU2006113885A (fr)
TW (1) TW200526321A (fr)
WO (1) WO2005030388A1 (fr)

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Publication number Publication date
BRPI0414770A (pt) 2006-11-21
JP2007506541A (ja) 2007-03-22
RU2006113885A (ru) 2007-11-20
US20070135302A1 (en) 2007-06-14
CN1859973B (zh) 2010-06-16
JP4800948B2 (ja) 2011-10-26
WO2005030388A1 (fr) 2005-04-07
CN1859973A (zh) 2006-11-08
TW200526321A (en) 2005-08-16

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