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EP0439976B1 - Verfahren und Vorrichtung zur Vorbehandlung der Rübenschnitzel vor der Diffusion - Google Patents

Verfahren und Vorrichtung zur Vorbehandlung der Rübenschnitzel vor der Diffusion Download PDF

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Publication number
EP0439976B1
EP0439976B1 EP90403670A EP90403670A EP0439976B1 EP 0439976 B1 EP0439976 B1 EP 0439976B1 EP 90403670 A EP90403670 A EP 90403670A EP 90403670 A EP90403670 A EP 90403670A EP 0439976 B1 EP0439976 B1 EP 0439976B1
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EP
European Patent Office
Prior art keywords
solution
cossettes
monosaccharate
stage
juice
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.)
Expired - Lifetime
Application number
EP90403670A
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English (en)
French (fr)
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EP0439976A1 (de
Inventor
Francis Dambrine
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Individual
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Individual
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    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/08—Extraction of sugar from sugar beet with water
    • C13B10/083—Treatment of sugar beet before extraction
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/08—Extraction of sugar from sugar beet with water
    • C13B10/10—Continuous processes
    • C13B10/107—Continuous processes with transportation in the form of thin layers, e.g. by endless chains

Definitions

  • the present invention relates to the extraction of sugar from beets by diffusion, an operation consisting in subjecting the beet pods to backwashing with hot water to produce, on the one hand, a sweet juice which is purified before being concentrated by evaporation then subjected to crystallization and, on the other hand, pulps which are pressed, to extract water which is recycled in diffusion, then dried.
  • the countercurrent circulation of the saccharated juice and the cossettes entails the obligation to water the cossettes with a juice with a high monosaccharate content just before they enter the diffusion device.
  • a fraction of the saccharated juice is entrained by the cossettes in the form of retention juice, in the diffusion apparatus.
  • the monosaccharate is unstable on heat; as soon as it enters the diffuser, it breaks down into sucrose and lime, and we know that the action of lime on the pods causes a certain number of undesirable reactions: deacetylation, formation of lime salts, flocculation, etc. This disadvantage is further aggravated when the saccharated juice contains hydrated lime (CaOH2) due to a poorly controlled preparation.
  • the object of the present invention is to provide a circulation of the saccharated juice in the treatment apparatus. preliminary of the cossettes making it possible to reduce in large proportions, or even to reduce to zero, the monosaccharate content of the retention juice, in order to avoid the drawbacks mentioned above, while maintaining optimal conditions for the reaction between juice and cossettes.
  • the process which is the subject of the present invention is characterized in that it comprises a first step during which the cossettes are brought into contact with a first solution of calcium monosaccharate by creating a countercurrent circulation of the solution and the cossettes , and a second step during which the cossettes are brought into contact with a second solution of calcium monosaccharate by creating a co-current circulation of the solution and the cossettes.
  • the treatment conditions in the first and second stages will be chosen so that the final content of calcium monosaccharate in the solutions used in these two stages is practically zero.
  • the first solution can be used to leach the pods before they are subjected to said treatment.
  • the second solution recovered at the end of the second step can be used to prepare the first solution.
  • reactors could be used for the implementation of the invention; if a permeable conveyor belt device is used, it will be equipped, in its upstream part, with a first set of distributors, collectors and pumps making it possible to carry out a countercurrent circulation of a first solution of calcium monosaccharate and cossettes, and, in its downstream part, a second set of distributors, collectors and pumps making it possible to produce a co-current circulation of a second solution of calcium monosaccharate and cossettes.
  • This installation comprises a permeable conveyor belt 10 which can be constituted by an endless belt conveyor used only for the treatment object of the invention and placed at the head of the diffusion apparatus, or by the upstream part of a diffusion apparatus endless permeable carpet.
  • the chips are loaded onto the belt at A, to form a regular and relatively thick layer 12, and are subjected to the calcification treatment during their transport from point A to point B.
  • Liquid distributors 14 to 19 made up of sprinklers or overflow troughs arranged transversely to the belt 10, over its entire width, are placed above the layer of pods and spaced along the conveyor. Collectors 22 to 27 are placed under the carpet to collect the juices spilled by the distributors, after they have passed through the layer of cossettes and the carpet.
  • the distributors 16 and 17 are fed by means of pumps 38 and 40 by two reactors 34 and 36 where the monosaccharate juice is produced from sweet juice and quicklime powder.
  • the saccharated juice poured by the distributor 16 onto the layer of cossettes is collected in the collector 24, taken up by the pump 30 and again poured onto the layer of cossettes by the distributor 15; it thus crosses the layer of cossettes several times before being collected in the collector 22, the circulation of the juice and the cossettes taking place generally in opposite directions.
  • the calcium ions of the monosaccharate dissolved in the juice attach to the pods; these are therefore gradually enriched in calcium ions while the juice is depleted in monosaccharate during this first treatment step.
  • the flow rate and the monosaccharate content of the juice produced in the reactor 34 and the number of passages through the layer of cossettes are chosen, so that the juice collected in the collector 22 is practically exhausted in monosaccharate.
  • This juice is taken up by the pump 28 and used to wash the fresh cossettes C, before the calcification treatment. A fraction of this juice is retained by the cossettes and the other part is collected, after passing through the layer of cossettes, in a collector 42 from which it is sent, by means of a pump 44, to the workshop d purification.
  • the calcium ion binding reaction on the cossettes continues during this second stage, with progressive depletion of the juice in monosaccharate.
  • the flow rate and the monosaccharate content of the juice supplying the dispenser 17 and the number of passages through the layer of cossettes are chosen, so that the monosaccharate content of the juice collected in the collector 27 is practically zero.
  • This juice is sent, by means of the pump 33, to the reactor 34 where it is used, to produce the saccharated juice supplying the dispenser 16.
  • This reactor could be a simple mixer where a fraction of the juice coming from the collector 27 would be mixed with saccharated juice produced in a reactor, for example reactor 36.
  • the juice used for the preparation of the saccharated juice in the reactor 36, and optionally in the reactor 34 is purified juice, it is advantageous to consume a minimum flow thereof.
  • the calcification reaction of the pods is favored by a high juice flow rate.
  • too high an alkalinity of the juice can promote deacetylation of the pods.
  • the distributor 17 could be supplied with only a fraction of the saccharated juice produced by the reactor 36 and of the recycled juice taken from the outlet of the pump 31; the other fraction of the saccharated juice produced by the reactor 36 will feed the distributor 16 mixed with the juice withdrawn from the collector 27 by the pump 33.
  • the process of the invention makes it possible to reduce and even practically reduce to zero the monosaccharate content of the retention juices introduced with the cossettes into the diffusion apparatus and, consequently, to eliminate the drawbacks, described above, related to the presence of an excess of lime at the top of the diffusion.
  • This reduction in the monosaccharate content of the retention juices makes it possible to reduce, from 20% to 30%, the requirements for monosaccharate, from which it results, in particular, a reduction in investments in the installation for preparing lime powder. and saccharated juice and a more stable operation of the diffusion installation because it is not subject to fluctuations in the composition of the retention juices.
  • This method also makes it possible to obtain clearer diffusion juices, the purification of which is facilitated, and a higher flow rate of leaching juice than in the known method and, consequently, better washing of the open pods.
  • Apparatuses of different types from that described above could be used for the implementation of the invention.
  • an apparatus for implementing the invention will comprise a first section where the cossettes and a first solution of monosaccharate circulate against the current and a second section where the cossettes and a second solution of monosaccharate circulate co- current.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Non-Alcoholic Beverages (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Cultivation Of Plants (AREA)
  • Extraction Or Liquid Replacement (AREA)

Claims (8)

  1. Verfahren zur Vorbehandlung von Rübenschnitzeln vor der Extraktion mittels einer Kalziummonosaccharatlösung, dadurch gekennzeichnet, daß es eine erste Stufe umfaßt, während der die Schnitzel mit einer ersten Kalziummonosaccharatlösung in Berührung gebracht werden, wobei ein Gegenstromumlauf von Lösung und Schnitzeln geschaffen wird, und eine zweite Stufe, während der die Schnitzel mit einer zweiten Kalziummonosaccharatlösung in Berührung gebracht werden und wobei ein Gleichstromumlauf von Lösung und Schnitzeln geschaffen wird.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß die Behandlungsbedingungen der ersten Stufe derart gewählt werden, daß der Kalziummonosaccharatgehalt der ersten Lösung nach ihrer Reaktion mit den Schnitzeln in dieser ersten Stufe praktisch gleich Null ist.
  3. Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Behandlungsbedingungen in der zweiten Stufe derart gewählt werden, das der Kalziummonosaccharatgehalt der zweiten Lösung am Ende der zweiten Stufe praktisch gleich Null ist.
  4. Verfahren gemäß Anspruch 2, dadurch gekennzeichnet, daß die erste Lösung nach ihrer Reaktion mit den Schnitzeln in der ersten Stufe benutzt wird, um die Schnitzel auszulaugen, bevor sie dieser ersten Behandlungsstufe ausgesetzt werden.
  5. Verfahren gemäß irgendeinem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß die zweite Lösung am Ende der zweiten Stufe benutzt wird, um die erste Lösung aufzubereiten.
  6. Verfahren gemäß Anspruch 5, dadurch gekennzeichnet, daß die erste Lösung durch Vermischung eines Teil des in einem Reaktor erzeugten Monosaccharatsaftes mit der am Ende der zweiten Stufe aufgefangenen Lösung hergestellt wird, und die zweite Lösung durch Vermischung des anderen Teils des in besagtem Reaktor erzeugten Monosaccharatsaftes mit einem zurückgeführten Teil der besagten zweiten Lösung.
  7. Apparat zur Durchführung des Verfahrens gemäß iregendeinem der Ansprüche 1 - 6, dadurch gekennzeichnet, daß er einen ersten Teil umfaßt, in dem die Schnitzel und eine erste Kalziummonosaccharatlösung im Gegenstrom zirkulieren, und einen zweiten Teil, in dem die Schnitzel und eine zweite Kalziummonosaccharatlösung im Gleichstrom zirkulieren.
  8. Apparat zur Durchführung des Verfahrens gemäß irgendeinem der Ansprüche 1 - 6, ausgerüstet mit einem durchlässigen Förderband, auf das die Schnitzel in einer Schicht mit gleichmässiger Dicke geladen werden und dadurch gekennzeichnet, daß er in seinem einlaufseitigen Teil mit einem ersten Satz von Verteilern (14-16), Sammlern (22-24) und Pumpen (28-30) versehen ist, die es gestatten, eine Gegenstrom-Zirkulation der Schnitzel und einer Kalziummonosaccharatlösung zu schaffen, und in seinem auslaufseitigen Teil mit einem zweiten Satz von Verteilern (17-19), Sammlern (25-27) und Pumpen (31-33), die es gestatten, eine Gleichstrom-Zirkulation der Schnitzel und einer Kalziummonosaccharatlösung zu schaffen.
EP90403670A 1990-01-24 1990-12-19 Verfahren und Vorrichtung zur Vorbehandlung der Rübenschnitzel vor der Diffusion Expired - Lifetime EP0439976B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9000783A FR2657357B1 (fr) 1990-01-24 1990-01-24 Procede et appareil pour le traitement preliminaire des cossettes de betteraves avant diffusion.
FR9000783 1990-01-24

Publications (2)

Publication Number Publication Date
EP0439976A1 EP0439976A1 (de) 1991-08-07
EP0439976B1 true EP0439976B1 (de) 1995-03-15

Family

ID=9393046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403670A Expired - Lifetime EP0439976B1 (de) 1990-01-24 1990-12-19 Verfahren und Vorrichtung zur Vorbehandlung der Rübenschnitzel vor der Diffusion

Country Status (6)

Country Link
EP (1) EP0439976B1 (de)
AT (1) ATE119944T1 (de)
DE (1) DE69017885T2 (de)
DK (1) DK0439976T3 (de)
ES (1) ES2071063T3 (de)
FR (1) FR2657357B1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1358592A (fr) * 1963-03-07 1964-04-17 Fives Lille Cail échangeur de chaleur entre matières solides et liquides
FR2268865B1 (de) * 1974-04-25 1976-10-15 Fives Cail Babcock
LU82924A1 (fr) * 1980-11-10 1982-06-30 Smet Extraction Procede de prediffusion en sucrerie
FR2525235B1 (fr) * 1982-04-16 1985-08-23 Ucb Sa Procede d'extraction du jus de betteraves
FR2641286B2 (fr) * 1988-11-18 1991-12-13 Fives Cail Babcock Perfectionnements a l'extraction par diffusion du sucre de betteraves

Also Published As

Publication number Publication date
ES2071063T3 (es) 1995-06-16
DK0439976T3 (da) 1995-07-24
FR2657357B1 (fr) 1992-04-17
DE69017885D1 (de) 1995-04-20
FR2657357A1 (fr) 1991-07-26
EP0439976A1 (de) 1991-08-07
DE69017885T2 (de) 1995-07-27
ATE119944T1 (de) 1995-04-15

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