EP0439976A1 - Process and apparatus for preliminary treatment of beet slices before diffusion - Google Patents

Process and apparatus for preliminary treatment of beet slices before diffusion Download PDF

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Publication number
EP0439976A1
EP0439976A1 EP90403670A EP90403670A EP0439976A1 EP 0439976 A1 EP0439976 A1 EP 0439976A1 EP 90403670 A EP90403670 A EP 90403670A EP 90403670 A EP90403670 A EP 90403670A EP 0439976 A1 EP0439976 A1 EP 0439976A1
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solution
monosaccharate
cossettes
calcium
juice
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EP90403670A
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German (de)
French (fr)
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EP0439976B1 (en
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Francis Dambrine
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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 using 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.
  • an apparatus consisting of a permeable mat transporting the pods, in a thick layer, was used from a loading station to the diffusion apparatus.
  • the cossettes are sprinkled with a solution of cold monosaccharate (saccharate juice) which is passed several times through the layer of cossettes while carrying out a circulation against the current, so that the concentration in monosaccharate of the saccharated juice decreases from its first passage through the layer of pods (diffusion side) to the last (loading side), and the reaction of calcium fixation on the pods is progressive.
  • the cossettes are leached to entrain the dry matter contained in the open cells.
  • Purified juice or, preferably, spent sucrose juice can be used as the leaching juice; the latter solution has the advantage of reducing the volume of purified juice recycled.
  • the countercurrent circulation of the saccharated juice and of the pods entails the obligation to water the pods 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 pods in the form of retention juice, in the diffusion device.
  • 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 decrease 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 cossettes 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.
  • a permeable conveyor belt device 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 allowing 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 monosaccharate content of the juice produced in 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 is 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 process also makes it possible to obtain clearer diffusion juices, the purification of which is facilitated, and a higher leaching juice flow rate than in the known process 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.

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

Abstract

Process and apparatus for preliminary treatment of beet slices, before diffusion, by means of a solution of calcium monosaccharate. To lower the monosaccharate content of the retained juice carried by the slices into the diffusion apparatus, while maintaining optimum conditions for the reaction between solution and slices, the treatment comprises a first stage during which the slices are placed in contact with a first solution of calcium monosaccharate, while creating a countercurrent wise movement of the solution and of the slices, and a second stage during which the slices are placed in contact with a second solution of calcium monosaccharate while creating a concurrent movement of the solution and of the slices.

Description

La présente invention a trait à l'extraction du sucre des betteraves par diffusion, opération consistant à soumettre les cossettes de betteraves à un lessivage à contre-courant au moyen d'eau chaude pour produire, d'une part, un jus sucré qui est épuré avant d'être concentré par évaporation puis soumis à une cristallisation et, d'autre part, des pulpes qui sont pressées, pour en extraire des eaux qui sont recyclées en diffusion, puis séchées.The present invention relates to the extraction of sugar from beets by diffusion, an operation consisting in subjecting the beet pods to backwashing using 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.

Pour réduire la teneur en matières pectiques du jus et améliorer le pressage des pulpes, il est connu de traiter les cossettes, avant la diffusion, avec une solution de monosaccharate de calcium, obtenue par addition de chaux vive à un jus sucré préalablement refroidi à une température convenable, pour fixer le calcium sur les cossettes.To reduce the content of pectic matter in the juice and improve the pressing of the pulps, it is known to treat the chips, before diffusion, with a solution of calcium monosaccharate, obtained by adding quicklime to a sweet juice previously cooled to a suitable temperature, to fix the calcium on the chips.

Pour effectuer ce traitement, on a utilisé un appareil constitué par un tapis perméable transportant les cossettes, en une couche épaisse, depuis un poste de chargement jusqu'à l'appareil de diffusion. Pendant leur transport, les cossettes sont arrosées par une solution de monosaccharate froide (jus saccharaté) que l'on fait passer plusieurs fois à travers la couche de cossettes en réalisant une circulation à contre-courant, de sorte que la concentration en monosaccharate du jus saccharaté va en décroissant depuis son premier passage à travers la couche de cossettes (côté diffusion) jusqu'au dernier (côté chargement), et la réaction de fixation du calcium sur les cossettes est progressive. Avant ce traitement, les cossettes sont lessivées pour entraîner les matières sèches contenues dans les cellules ouvertes. On peut utiliser comme jus de lessivage du jus épuré ou, de préférence, du jus saccharaté épuisé; cette dernière solution a l'avantage de réduire le volume de jus épuré recyclé.To carry out this treatment, an apparatus consisting of a permeable mat transporting the pods, in a thick layer, was used from a loading station to the diffusion apparatus. During their transport, the cossettes are sprinkled with a solution of cold monosaccharate (saccharate juice) which is passed several times through the layer of cossettes while carrying out a circulation against the current, so that the concentration in monosaccharate of the saccharated juice decreases from its first passage through the layer of pods (diffusion side) to the last (loading side), and the reaction of calcium fixation on the pods is progressive. Before this treatment, the cossettes are leached to entrain the dry matter contained in the open cells. Purified juice or, preferably, spent sucrose juice can be used as the leaching juice; the latter solution has the advantage of reducing the volume of purified juice recycled.

La circulation à contre-courant du jus saccharaté et des cossettes entraîne l'obligation d'arroser les cossettes avec un jus à forte teneur en monosaccharate juste avant leur entrée dans l'appareil de diffusion. Malgré les précautions prises (temps d'égouttage, cylindres de répression), une fraction du jus saccharaté est entraînée par les cossettes sous forme de jus de rétention, dans l'appareil de diffusion. Or le monosaccharate est instable à la chaleur; dès son entrée dans le diffuseur, il se décompose en saccharose et chaux, et on sait que l'action de la chaux sur les cossettes provoque un certain nombre de réactions indésirables : désacetylation, formation de sels de chaux, floculation, etc.. Cet inconvénient est encore aggravé lorsque le jus saccharaté contient de la chaux hydratée (CaOH2) à cause d'une préparation mal contrôlée.The countercurrent circulation of the saccharated juice and of the pods entails the obligation to water the pods with a juice with a high monosaccharate content just before they enter the diffusion device. Despite the precautions taken (draining time, repression cylinders), a fraction of the saccharated juice is entrained by the pods in the form of retention juice, in the diffusion device. However, 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.

Le but de la présente invention est de réaliser une circulation du jus saccharaté dans l'appareil de traitement préliminaire des cossettes permettant de diminuer dans de fortes proportions, ou même de réduire à zéro, la teneur en monosaccharate du jus de rétention, afin d'éviter les inconvénients mentionnés ci-dessus, tout en maintenant des conditions optimales pour la réaction entre jus et cossettes.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 decrease 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.

Le procédé objet de la présente invention est caractérisé en ce qu'il comporte une première étape au cours de laquelle les cossettes sont mises en contact avec une première solution de monosaccharate de calcium en créant une circulation à contre-courant de la solution et des cossettes, et une seconde étape au cours de laquelle les cossettes sont mises en contact avec une seconde solution de monosaccharate de calcium en créant une circulation à co-courant de la solution et des 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.

Les conditions de traitement dans les première et seconde étapes seront choisies pour que la teneur finale en monosaccharate de calcium des solutions utilisées dans ces deux étapes soit pratiquement nulle.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.

Après avoir été épuisée dans la première étape du traitement, la première solution pourra être utilisée pour lessiver les cossettes avant qu'elles ne soient soumises audit traitement.After being exhausted in the first stage of treatment, the first solution can be used to leach the cossettes before they are subjected to said treatment.

La seconde solution récupérée en fin de seconde étape pourra être utilisée pour préparer la première solution.The second solution recovered at the end of the second step can be used to prepare the first solution.

Différents types de réacteurs pourront être utilisés pour la mise en oeuvre de l'invention. Si on utilise un appareil à tapis transporteur perméable, celui-ci sera équipé, dans sa partie amont, d'un premier jeu de distributeurs, collecteurs et pompes permettant de réaliser une circulation à contre-courant d'une première solution de monosaccharate de calcium et des cossettes, et, dans sa partie aval, d'un second jeu de distributeurs, collecteurs et pompes permettant de réaliser une circulation à co-courant d'une seconde solution de monosaccharate de calcium et des cossettes.Different types of reactors may 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 allowing 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.

D'autres caractéristiques de l'invention apparaîtront à la lecture de la description qui suit et se réfère au dessin l'accompagnant qui est le schéma d'une installation pour la mise en oeuvre de l'invention donné à titre d'exemple non limitatif.Other characteristics of the invention will appear on reading the description which follows and refers to the accompanying drawing which is a diagram of an installation for implementing the invention given by way of non-limiting example .

Cette installation comporte un tapis transporteur perméable 10 qui peut être constitué par un transporteur à bande sans fin servant uniquement au traitement objet de l'invention et placé en tête de l'appareil de diffusion, ou par la partie amont d'un appareil de diffusion à tapis perméable sans fin. Les cossettes sont chargées sur le tapis en A, pour former une couche 12 régulière et relativement épaisse, et sont soumises au traitement de calcification pendant leur transport du point A jusqu'au point B.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.

Des distributeurs de liquide 14 à 19, constitués par des rampes d'arrosage ou des auges à déversoir disposées transversalement au tapis 10, sur toute sa largeur, sont placés au-dessus de la couche de cossettes et espacés le long du transporteur. Des collecteurs 22 à 27 sont placés sous le tapis pour recueillir les jus déversés par les distributeurs, après qu'ils aient traversé la couche de cossettes et le tapis.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.

Des pompes 28 à 33 assurent la circulation des jus des collecteurs vers les distributeurs.Pumps 28 to 33 ensure the circulation of the juices from the collectors to the distributors.

Les distributeurs 16 et 17 sont alimentés au moyen de pompes 38 et 40 par deux réacteurs 34 et 36 où est produit le jus monosaccharaté à partir de jus sucré et de chaux vive en poudre.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.

En régime de marche normal, le jus saccharaté déversé par le distributeur 16 sur la couche de cossettes est recueilli dans le collecteur 24, repris par la pompe 30 et à nouveau déversé sur la couche de cossettes par le distributeur 15; il traverse ainsi plusieurs fois la couche de cossettes avant d'être recueilli dans le collecteur 22, la circulation du jus et des cossettes s'effectuant globalement en sens inverses. Au contact des cossettes, les ions calcium du monosaccharate dissous dans le jus se fixent sur les cossettes; celles-ci s'enrichissent donc progressivement en ions calcium tandis que le jus s'appauvrit en monosaccharate au cours de cette première étape de traitement.In normal operating conditions, 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. In contact with the pods, 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.

Le débit et la teneur en monosaccharate du jus produit dans le réacteur 34 et le nombre de passages à travers la couche de cossettes sont choisis, de telle sorte que le jus recueilli dans le collecteur 22 soit pratiquement épuisé en monosaccharate. Ce jus est repris par la pompe 28 et utilisé pour lessiver les cossettes fraîches C, préalablement au traitement de calcification. Une fraction de ce jus est retenue par les cossettes et l'autre partie est recueillie, après avoir traversé la couche de cossettes, dans un collecteur 42 d'où elle est envoyée, au moyen d'une pompe 44, à l'atelier d'épuration.The flow rate and monosaccharate content of the juice produced in 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.

Le jus saccharaté déversé par le distributeur 17 situé immédiatement en aval du distributeur 16 en considérant le sens de déplacement des cossettes, est recueilli dans le collecteur 25, repris par la pompe 31 et à nouveau déversé sur la couche de cossettes par le distributeur 18; il traverse ainsi plusieurs fois la couche de cossettes avant d'être recueilli dans le collecteur 27, la circulation du jus et des cossettes s'effectuant globalement dans le même sens dans cette partie de l'installation. La réaction de fixation des ions calcium sur les cossettes se poursuit au cours de cette seconde étape, avec appauvrissement progressif du jus en monosaccharate.The saccharated juice poured out by the distributor 17 located immediately downstream from the distributor 16, considering the direction of movement of the cossettes, is collected in the collector 25, taken up by the pump 31 and again poured onto the layer of cossettes by the distributor 18; it thus crosses the layer of cossettes several times before being collected in the collector 27, the circulation of the juice and the cossettes taking place generally in the same direction in this part of the installation. The calcium ion binding reaction on the cossettes continues during this second stage, with progressive depletion of the juice in monosaccharate.

Le débit et la teneur en monosaccharate du jus alimentant le distributeur 17 et le nombre de passages à travers la couche de cossettes sont choisis, de telle sorte que la teneur en monosaccharate du jus recueilli dans le collecteur 27 soit pratiquement nulle. Ce jus est envoyé, au moyen de la pompe 33, dans le réacteur 34 où il est utilisé, pour produire le jus saccharaté alimentant le distributeur 16. Ce réacteur pourrait être un simple mélangeur où une fraction du jus provenant du collecteur 27 serait mélangée à du jus saccharaté produit dans un réacteur, par exemple le réacteur 36.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 is mixed with saccharated juice produced in a reactor, for example reactor 36.

Etant donné que le jus utilisé pour la préparation du jus saccharaté dans le réacteur 36, et éventuellement dans le réacteur 34, est du jus épuré, on a intérêt à en consommer un débit minimum. Mais, par ailleurs, la réaction de calcification des cossettes est favorisée par un débit de jus important. Par contre, une alcalinité trop élevée du jus peut favoriser la désacétylation des cossettes. C'est pourquoi, il peut être avantageux de recycler une fraction du jus après son premier passage à travers la couche de cossettes, et éventuellement après les passages suivants, dans chacune des étapes de traitement. On pourra ainsi renvoyer au distributeur 17 une partie du jus refoulé par la pompe 31, comme indiqué en traits discontinus sur le dessin; de même une fraction du jus refoulé par la pompe 30 pourra être renvoyée au distributeur 16.Since 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. However, on the other hand, the calcification reaction of the pods is favored by a high juice flow rate. On the other hand, too high an alkalinity of the juice can promote deacetylation of the pods. This is why, it may be advantageous to recycle a fraction of the juice after its first passage through the layer of cossettes, and possibly after the following passages, in each of the treatment stages. We can thus return to the distributor 17 a portion of the juice discharged by the pump 31, as indicated in broken lines in the drawing; similarly, a fraction of the juice discharged by the pump 30 can be returned to the distributor 16.

En variante, le distributeur 17 pourra être alimenté avec une fraction seulement du jus saccharaté produit par le réacteur 36 et du jus recyclé prélevé au refoulement de la pompe 31; l'autre fraction du jus saccharaté produit par le réacteur 36 alimentera le distributeur 16 mélangée au jus soutiré du collecteur 27 par la pompe 33.As a variant, 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.

Le procédé de l'invention permet de diminuer et même pratiquement de réduire à zéro la teneur en monosaccharate des jus de rétention introduits avec les cossettes dans l'appareil de diffusion et, par conséquent, de supprimer les inconvénients, décrits plus haut, liés à la présence d'un excès de chaux en tête de diffusion. Cette réduction de la teneur en monosaccharate des jus de rétention permet de diminuer, de 20 % à 30 %, les besoins en monosaccharate, d'où il résulte, notamment, une diminution des investissements dans l'installation de préparation de la poudre de chaux et du jus saccharaté et un fonctionnement de l'installation de diffusion plus stable parce que non soumis aux fluctuations de la composition des jus de rétention. Ce procédé permet aussi d'obtenir des jus de diffusion plus clairs, dont l'épuration est facilitée, et un débit de jus de lessivage plus élevé que dans le procédé connu et, par conséquent, un meilleur lavage des cossettes ouvertes.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 process also makes it possible to obtain clearer diffusion juices, the purification of which is facilitated, and a higher leaching juice flow rate than in the known process and, consequently, better washing of the open pods.

Des appareils de types différents de celui décrit ci-dessus pourraient être utilisés pour la mise en oeuvre de l'invention. On pourrait, en particulier, utiliser une auge ou une cuve horizontale munie d'une vis assurant le transport des cossettes d'une extrémité à l'autre, d'entrées de jus en un point intermédiaire et de sorties de jus aux deux extrémités. On pourrait aussi prévoir d'utiliser deux réacteurs séparés, un pour l'étape à contre-courant et l'autre pour l'étape à co-courant.Apparatuses of different types from that described above could be used for the implementation of the invention. One could, in particular, use a trough or a horizontal tank provided with a screw ensuring the transport of the pods from one end to the other, of juice inlets at an intermediate point and juice outlets at both ends. One could also plan to use two separate reactors, one for the counter-current stage and the other for the co-current stage.

Il est bien entendu que ces modifications et toute celles résultant de la substitution de moyens techniques équivalents entrent dans le cadre de l'invention.It is understood that these modifications and all those resulting from the substitution of equivalent technical means are within the scope of the invention.

Claims (8)

Procédé pour le traitement préliminaire, avant diffusion, des cossettes de betteraves au moyen d'une solution de monosaccharate de calcium, caractérisé en ce qu'il comporte une première étape au cours de laquelle les cossettes sont mises en contact avec une première solution de monosaccharate de calcium en créant une circulation à contre-courant de la solution et des cossettes, et une seconde étape au cours de laquelle les cossettes sont mises en contact avec une seconde solution de monosaccharate de calcium en créant une circulation à co-courant de la solution et des cossettes.Process for the preliminary treatment, before diffusion, of the beet pods by means of a solution of calcium monosaccharate, characterized in that it comprises a first stage during which the pods are brought into contact with a first solution of monosaccharate of calcium by creating a counter-current 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 cossettes. Procédé selon la revendication 1, caractérisé en ce que les conditions de traitement dans la première étape sont choisies pour que la teneur en monosaccharate de calcium de la première solution, après qu'elle ait réagi avec les cossettes dans cette première étape, soit pratiquement nulle.Method according to claim 1, characterized in that the treatment conditions in the first step are chosen so that the calcium monosaccharate content of the first solution, after it has reacted with the cossettes in this first step, is practically zero . Procédé selon la revendication 1 ou 2, caractérisé en ce que les conditions de traitement dans la seconde étape sont choisies pour que la teneur en monosaccharate de calcium de la seconde solution à la fin de cette seconde étape soit pratiquement nulle.Method according to claim 1 or 2, characterized in that the treatment conditions in the second step are chosen so that the calcium monosaccharate content of the second solution at the end of this second step is practically zero. Procédé selon la revendication 2, caractérisé en ce que la première solution est utilisée, après avoir réagi avec les cossettes dans la première étape, pour lessiver les cossettes avant qu'elles ne soient soumises à cette première étape de traitement.Method according to claim 2, characterized in that the first solution is used, after having reacted with the cossettes in the first step, to leach the cossettes before they are subjected to this first treatment step. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la seconde solution est utilisée, en fin de seconde étape, pour préparer la première solution.Process according to any one of Claims 1 to 4, characterized in that the second solution is used, at the end of the second step, to prepare the first solution. Procédé selon la revendication 5, caractérisé en ce que la première solution est préparée par mélange d'une fraction du jus monosaccharaté produit par un réacteur avec la solution récupérée en fin de seconde étape, et la seconde solution est préparée par mélange de l'autre fraction du jus monosaccharaté produit par ledit réacteur avec une partie recyclée de ladite seconde solution.Process according to claim 5, characterized in that the first solution is prepared by mixing a fraction of the monosaccharate juice produced by a reactor with the solution recovered at the end of the second step, and the second solution is prepared by mixing the other fraction of the monosaccharate juice produced by said reactor with a recycled part of said second solution. Appareil pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comporte une première section où les cossettes et une première solution de monosaccharate de calcium circulent à contre-courant et une seconde section où les cossettes et une seconde solution de monosaccharate de calcium circulent à co-courant.Apparatus for carrying out the method according to any one of claims 1 to 6, characterized in that it comprises a first section where the pods and a first solution of calcium monosaccharate circulate against the current and a second section where the cossettes and a second solution of calcium monosaccharate circulate co-current. Appareil pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 6, comportant un tapis transporteur perméable, sur lequel les cossettes sont chargées en couche d'épaisseur régulière, et caractérisée en ce qu'il est équipé, dans sa partie amont, d'un premier jeu de distributeurs (14-16), collecteurs (22-24) et pompes (28-30) permettant de réaliser une circulation à contre-courant des cossettes et d' une solution de monosaccharate de calcium, et dans sa partie aval, d'un second jeu de distributeurs (17-19), collecteurs (25-27) et pompes (31-33) permettant de réaliser une circulation à co-courant des cossettes et d'une solution de monosaccharate de calcium.Apparatus for implementing the method according to any one of claims 1 to 6, comprising a permeable conveyor belt, on which the pods are loaded with a layer of regular thickness, and characterized in that it is equipped, in its upstream part, of a first set of distributors (14-16), collectors (22-24) and pumps (28-30) allowing a countercurrent circulation of the pods and of a calcium monosaccharate solution, and in its downstream part, a second set of distributors (17-19), collectors (25-27) and pumps (31-33) making it possible to co-current circulation of the pods and a solution of monosaccharate calcium.
EP90403670A 1990-01-24 1990-12-19 Process and apparatus for preliminary treatment of beet slices before diffusion Expired - Lifetime EP0439976B1 (en)

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Application Number Priority Date Filing Date Title
FR9000783 1990-01-24
FR9000783A FR2657357B1 (en) 1990-01-24 1990-01-24 METHOD AND APPARATUS FOR THE PRELIMINARY TREATMENT OF BEET COSSETTES BEFORE DISSEMINATION.

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EP0439976A1 true EP0439976A1 (en) 1991-08-07
EP0439976B1 EP0439976B1 (en) 1995-03-15

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AT (1) ATE119944T1 (en)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1048326A (en) * 1963-03-07 1966-11-16 Fives Lille Cail A process and apparatus for heating sugar containing materials
FR2268865A1 (en) * 1974-04-25 1975-11-21 Fives Cail Babcock
GB2086757A (en) * 1980-11-10 1982-05-19 Smet Extraction Pre-diffusion method for sugar-works
EP0092466A1 (en) * 1982-04-16 1983-10-26 UNION NATIONALE DES COOPERATIVES AGRICOLES DE TRANSFORMATION DE LA BETTERAVE par abréviation " U.C.B." Société dite: Process for extracting beet juice
EP0370869A1 (en) * 1988-11-18 1990-05-30 F C B Diffusion of beet sugar

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1048326A (en) * 1963-03-07 1966-11-16 Fives Lille Cail A process and apparatus for heating sugar containing materials
DE1567273B1 (en) * 1963-03-07 1972-06-08 Fives Lille Cail Device for pre-brewing and preheating sugar beet pulp
FR2268865A1 (en) * 1974-04-25 1975-11-21 Fives Cail Babcock
GB2086757A (en) * 1980-11-10 1982-05-19 Smet Extraction Pre-diffusion method for sugar-works
EP0092466A1 (en) * 1982-04-16 1983-10-26 UNION NATIONALE DES COOPERATIVES AGRICOLES DE TRANSFORMATION DE LA BETTERAVE par abréviation " U.C.B." Société dite: Process for extracting beet juice
EP0370869A1 (en) * 1988-11-18 1990-05-30 F C B Diffusion of beet sugar

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DE69017885D1 (en) 1995-04-20
DK0439976T3 (en) 1995-07-24
FR2657357B1 (en) 1992-04-17
ES2071063T3 (en) 1995-06-16
FR2657357A1 (en) 1991-07-26
EP0439976B1 (en) 1995-03-15
DE69017885T2 (en) 1995-07-27
ATE119944T1 (en) 1995-04-15

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