Classifications

• • C—CHEMISTRY; METALLURGY
  • C13—SUGAR INDUSTRY
  • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
  • C13B10/00—Production of sugar juices
  • C13B10/006—Conservation of sugar juices

Definitions

• the subject invention relates to a method for preservation of thick sugar juice stored in a tank, which has a concentration of 65% to 70% by weight.
• the invention further relates to a device to carry out this procedure.
• the state of the art for thick juice storage is described in the specialist literature.
• the juice to be stored is cooled down to temperatures from 10 ° C to 20 ° C, by raising its pH to 9.0 to 9.5 and conditioned to 66% to 68% by adjusting the dry matter content.
• the juice surface must in particular Ways to be protected against microorganism infestation, because of the Presence of atmospheric oxygen and an infection pressure due to condensation given is.
• the present invention is therefore based on the object of protection the thick juice surface without expensive tank constructions with one To ensure auxiliary material, for which there is no residual quantity problem.
• This is achieved according to the invention in that the thick juice surface a layer of aqueous alkali lye with a concentration from 10 wt .-% to 30 wt .-% applied in a thickness of 1 mm to 5 mm becomes.
• the lye removes the microorganisms on the surface not just inhibited, but killed. Then the high Concentrations of lye are reduced by diffusion into the thick juice, being germ-resistant over a period of several months pH values in the top juice layer are retained. By revolution of the tank contents before processing can lye residues, which still are not diffused into the total thick juice, completely mixed in with a slight pH increase in the total thick juice, which, however, neither for the subsequent processing nor for the End product is disruptive.
• the method according to the invention has an essential difference compared to the prior art: With the usual increase in pH in thick juice, which is usually carried out with sodium hydroxide solution and reaches a pH of 9.0 to 9.5, only an inhibition of germs is achieved, but the germs are not killed. Since viable germs are still contained in the thick juice, they can immediately start to work again when the pH value drops. If there is no air access, the inhibition of germs is usually sufficient to preserve the thick juice, but in normal storage tanks air gets to the thick juice surface, which means that infections can spread if the surface is stored for a long time. Therefore, the additional measures described in the literature for protecting the juice surface, such as special tank constructions, paraffin oil or formalin, have always been required.
• the pH value of the surface area can of the thick juice.
• the coating with alkali lye is advantageously renewed.
• the preconditioning of the thick juice is not necessary the pH from 9.0 to 9.5, which is why they only work under certain conditions is used.
• the waste caused by the use of lye the dry substance on the surface is caused by diffusion processes equalized faster than the alkalinity gradient.
• the procedure is also in the event of a fault for the remediation of massively infected Suitable juice surfaces, with microbiologically formed invert sugar alkaline degradation with the formation of acids and dyes.
• the acid formation from invert sugar must be increased Dimensioning of the amounts of lye used.
• the lye In order to the applied lye remains on the surface and it actually closes If there is an overlayer, the lye must have a density below the thick juice density can be used.
• the Killing the microorganisms requires the highest possible concentration. The two opposing objectives are set by application of lye concentrations in the range of 10% to 30%.
• the layer of thick juice can be overlaid by applying the alkali lye anywhere on the thick juice surface.
• This application can, for example, from the edge or from the middle or through a combination of both options.
• the alkaline solution can also be sprayed onto the surface of the thick juice. It is also possible to bring the lye into the lower tank zones, because of the lower density in the concentration range used independently the surface rises and spreads out there. However, with that Lye loss is associated and there may be an additional color formation occur, which is why this process variant only under certain conditions is carried out.
• An interesting aspect of the present invention is that in Application of the method according to the invention and additional use of hop products to inhibit germ growth in the beet extraction process the use of formalin in the sugar factory completely can fall away.
• the extraction can be carried out in the presence of a solid, dissolved or emulsified hop product or it can be a solution of the hop extract in solution or emulsified form have been added.
• the method according to the invention is advantageously carried out in one device carried out, which in a known manner a tank with a tank cap, Inlet and outlet devices for the thick juice to be stored and a Nozzle system for spraying the alkali lye onto the surface of the thick juice has in the tank head area.
• a device can also be used are used, in which the feed devices for the alkali metal hydroxide solution with feed openings in the tank wall in the area above the liquid surface provided in the tank along the circumference of the tank are distributed, connected.
• Such a device preferably has a timer for each Infeed opening for alternate loading through the respective infeed opening on.
• a device for performing the invention The process can also include feeders for the alkaline solution in the Have an area above the liquid surface provided in the tank, whose outlet openings lead to a floating body, which can be applied to the surface of the stored thick juice.
• the Floats can be provided anywhere on the tank surface be.
• An advantageous device can also be combined by feed openings arranged along the circumference of the tank and one Float be formed.
• a plastic floating cup is anchored below this opening.
• the cup has a diameter of 1 m and a height of 8 cm.
• the cup can be dismantled for subsequent insertion into an existing tank.
• a flexible supply for caustic soda is attached to the swimming pool.
• the length of the suspension and the length of the supply line are dimensioned such that the cup floats on the surface of the thick juice after the tank has been filled.
• 2.5 m 3 of 20% sodium hydroxide solution are pumped over the floating cup onto the tank surface within 24 hours.
• the floating cup prevents the occurrence of turbulence at the point of contact between the lye stream and the thick juice surface and leads to a better layering of the tank surface.
• the spreading of the sodium hydroxide solution is checked via pH measurement in surface samples via a control opening on the outer jacket of the tank, and if necessary a re-coating is carried out after a week. If the pH drops below 10, the coating is repeated.
• a nozzle system for applying auxiliary substances to the tank surface is installed in a tank with a diameter of 40 m.
• the tank construction is completely tight.
• the tank head space is only connected to the outside air via a siphon.
• a tightly sealable control opening is installed, from which surface samples can be taken.
• 2 m 3 of sodium hydroxide solution with a content of 25% are introduced via the nozzle system, the closed system preventing aerosol from escaping from the tank.
• the nozzle system is then flushed out several times alternately with an air stream and a water stream, a maximum of 100 liters of water being introduced in order to avoid dilution of the sodium hydroxide solution.
• 5% sodium hydroxide solution is used as the siphon liquid.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Biochemistry (AREA)
• Organic Chemistry (AREA)
• Storage Of Fruits Or Vegetables (AREA)
• Non-Alcoholic Beverages (AREA)
• Detergent Compositions (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=3524640

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (6)

Family Cites Families (2)

• 1997
  • 1997-11-18 AT AT195497A patent/AT406377B/de not_active IP Right Cessation
• 1998
  • 1998-09-08 EP EP98890259A patent/EP0916738A3/fr not_active Withdrawn

Patent Citations (6)

Non-Patent Citations (1)

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