EP0497699A1 - Improved preliminary treatments of cossettes before diffusion - Google Patents

Improved preliminary treatments of cossettes before diffusion Download PDF

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Publication number
EP0497699A1
EP0497699A1 EP92400242A EP92400242A EP0497699A1 EP 0497699 A1 EP0497699 A1 EP 0497699A1 EP 92400242 A EP92400242 A EP 92400242A EP 92400242 A EP92400242 A EP 92400242A EP 0497699 A1 EP0497699 A1 EP 0497699A1
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Prior art keywords
juice
diffusion
cossettes
leaching
saccharator
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EP92400242A
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German (de)
French (fr)
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EP0497699B1 (en
Inventor
François Rouanne
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Dambrine Francis
F C B
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Dambrine Francis
F C B
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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
    • C13B10/14—Production of sugar juices using extracting agents other than water, e.g. alcohol or salt solutions

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 and then subjected to crystallization and, on the other hand, pulps which are pressed, to extract water which is recycled in diffusion, then dried.
  • a saccharator which can be of the endless belt type or of any other suitable type for ensuring mass exchanges between pods and juice.
  • this device there is either a generally counter-current circulation of the pods and the saccharated juice, or successively a generally counter-current circulation then a generally co-current circulation.
  • a so-called "leaching" juice consisting of a fraction of the saccharated juice used for processing the pods and the cellular juice of the pods opened during the cutting of the beets caused by leaching.
  • This juice which, because of this leaching, contains impurities in very large quantities, in particular pectic matter, is subjected to pulping and then to progressive liming and sent to the purification workshop of the sugar refinery.
  • saccharated cossettes are obtained with retention juice from the other fraction of the juice used for the treatment, juice retained by capillarity in the mass of the treated cossettes ; these chips and the retention juice are allowed for distribution.
  • This extraction process comprising the preliminary treatment of the cossettes with a solution of calcium monosaccharate is called extraction or alkaline diffusion. It makes it possible to produce pulps having better pressability and to obtain, after mechanical pressing, pulps with a higher dry matter content and, consequently, to achieve appreciable energy savings for drying the pulps.
  • This process also makes it possible to partially purify the diffusion juices in the diffuser itself, before racking, thanks to the alkalinity of the pods due to their prior treatment in the saccharator.
  • the impurities resulting from this purification of the juice in the diffuser are physically attached to the pods and are recovered with the spent pulps at the outlet of the diffuser. These impurities are rich in organic matter, in particular pectic, and the additional pulp flow rate they provide, called "plus-pulp", constitutes an important element of the economic interest of the process.
  • the object of the present invention is to increase the quantity of "plus-pulp" produced in diffusion and, consequently, to further increase the profitability of the alkaline diffusion process.
  • the process which is the subject of the invention consists in returning the leaching juice, previously pulped and possibly pre-limed, to diffusion.
  • the impurities of the juice possibly flocculated by pre-liming, physically attach to the mass of the pods and are recovered with the pulps at the outlet of the diffuser. This increases the amount of "over-pulp" and, in return, reduces the amount of impurities extracted with the scum and, therefore, the total consumption of lime.
  • the leaching juice will be sent into the heat exchanger placed at the head of the diffusion, which may or may not be incorporated into the diffuser, respecting the conditions of concentration and temperature. It can be introduced at several points of the exchanger to achieve satisfactory growth in the alkalinity of the juice in this device.
  • This installation essentially consists of a saccharator 10 and a diffusion device 12 in which a heat exchanger 14 is incorporated or associated.
  • the saccharator 10 could be, for example, of the endless belt type, the cossettes being loaded in A on the carpet to form a regular layer and subjected to the calcification treatment during their transport from one end to the other of the apparatus. Leaving the saccharator 10, the cossettes are introduced at B into the heat exchanger 14 where they are brought to a suitable temperature, then transferred to the diffuser 12. The spent pulps are extracted at C at the end of the diffuser opposite to that adjacent to the heat exchanger, and water is introduced in D at this end of the diffuser. The cossettes and the water, which gradually loads with sugar, flow against the current in the diffuser and in the exchanger and the sweet juice, called diffusion juice, is extracted at E of the exchanger 14.
  • the pods are treated with saccharated juice according to the method used in patent application No. 90/00783 in the name of one of the applicants.
  • the saccharated juice is introduced at F, at an intermediate point of the saccharator, and divided into two streams which flow, respectively, towards the upstream end and towards the downstream end of the saccharator.
  • the circulations of the juice and the cossettes are carried out generally in opposite directions.
  • the exhausted juice or at least depleted in monosaccharate is used to leach fresh pods. Recycling can be provided, as indicated in the drawing, to increase the flow of circulating juice and, consequently, the efficiency of leaching.
  • the part of the juice not retained by the chips is extracted at G and constitutes the leaching juice; this juice is pulped at 16, then subjected to progressive pre-liming at 18 and introduced at H into the heat exchanger 14, in accordance with the invention.
  • This introduction of the leaching juice can be done at one or more points of the exchanger, taking into account the conditions of temperature and lime concentration. Some or all of the leaching juice could also be introduced into the diffuser.
  • the organic impurities in the leaching juice, the flocculation of which has been caused by pre-liming physically attach to the pods in the heat exchanger or the diffuser and are collected at the outlet of the diffuser with the pulps.
  • the circulation of the juice and the pods takes place generally in the same direction.
  • the juice extracted at the downstream end of the saccharator can be used in the upstream part in mixture with the fresh saccharated juice.

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  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Paper (AREA)
  • Non-Alcoholic Beverages (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Cephalosporin Compounds (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Saccharide Compounds (AREA)

Abstract

Process for the preliminary treatment, before diffusion, of sugar beet cossettes, by means of a solution of calcium monosaccharate, consisting of a prior leaching of the cossettes with the solution which was used for the preliminary treatment. In order to increase the quantity of pulps produced in diffusion and to increase the profitability of the diffusion process, the leaching liquor (G), previously separated from the pulp (at 16) and optionally limed or prelimed (at 18), is sent to diffusion (12-14). <IMAGE>

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 jar 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 and 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, (jus saccharaté), obtenu 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 (saccharated juice), obtained by adding quicklime to a juice sweetened beforehand cooled to a suitable temperature, to fix the calcium on the chips.

Le traitement des cossettes avant diffusion s'effectue dans un appareil, appelé saccharateur, qui peut être du type à tapis sans fin ou de tout autre type convenable pour assurer des échanges massiques entre cossettes et jus. Dans cet appareil, on réalise soit une circulation globalement à contre-courant des cossettes et du jus saccharaté, soit successivement une circulation globalement à contre-courant puis une circulation globalement à co-courant. Quel que soit le procédé utilisé, on obtient à l'extrémité amont du saccharateur, côté entrée des cossettes, un jus dit "de lessivage" constitué d'une fraction du jus saccharaté ayant servi pour le traitement des cossettes et du suc cellulaire des cossettes ouvertes lors du découpage des betteraves entraîné par lessivage. Ce jus qui, du fait de ce lessivage, contient des impuretés en quantité très importante, notamment des matières pectiques, est soumis à un épulpage puis à un préchaulage progressif et envoyé à l'atelier d'épuration de la sucrerie. A l'extrémité aval du saccharateur, côté opposé à l'entrée des cossettes, on obtient des cossettes saccharatées avec du jus de rétention provenant de l'autre fraction du jus utilisé pour le traitement, jus retenu par capillarité dans la masse des cossettes traitées; ces cossettes et le jus de rétention sont admis en diffusion.The treatment of the pods before diffusion is carried out in a device, called a saccharator, which can be of the endless belt type or of any other suitable type for ensuring mass exchanges between pods and juice. In this device, there is either a generally counter-current circulation of the pods and the saccharated juice, or successively a generally counter-current circulation then a generally co-current circulation. Whatever the process used, we obtain at the upstream end of the saccharator, on the input side of the pods, a so-called "leaching" juice consisting of a fraction of the saccharated juice used for processing the pods and the cellular juice of the pods opened during the cutting of the beets caused by leaching. This juice which, because of this leaching, contains impurities in very large quantities, in particular pectic matter, is subjected to pulping and then to progressive liming and sent to the purification workshop of the sugar refinery. At the downstream end of the saccharator, on the side opposite the entry of the cossettes, saccharated cossettes are obtained with retention juice from the other fraction of the juice used for the treatment, juice retained by capillarity in the mass of the treated cossettes ; these chips and the retention juice are allowed for distribution.

Ce procédé d'extraction comportant le traitement préliminaire des cossettes par une solution de monosaccharate de calcium est appelé extraction ou diffusion alcaline. Il permet de produire des pulpes ayant une meilleure pressabilité et d'obtenir, après pressage mécanique, des pulpes à plus haute teneur en matières sèches et, par conséquent, de réaliser des économies d'énergie appréciables pour le séchage des pulpes. Ce procédé permet en outre d'épurer partiellement les jus de diffusion dans le diffuseur lui-même, avant soutirage, grâce à l'alcalinité des cossettes due à leur traitement préalable dans le saccharateur. Les impuretés résultant de cette épuration du jus dans le diffuseur se fixent physiquement sur les cossettes et sont récupérées avec les pulpes épuisées à la sortie du diffuseur. Ces impuretés sont riches en matières organiques, notamment pectiques, et le supplément de débit de pulpes qu'elles procurent, appelé "plus-pulpe", constitue un élément important de l'intérêt économique du procédé.This extraction process comprising the preliminary treatment of the cossettes with a solution of calcium monosaccharate is called extraction or alkaline diffusion. It makes it possible to produce pulps having better pressability and to obtain, after mechanical pressing, pulps with a higher dry matter content and, consequently, to achieve appreciable energy savings for drying the pulps. This process also makes it possible to partially purify the diffusion juices in the diffuser itself, before racking, thanks to the alkalinity of the pods due to their prior treatment in the saccharator. The impurities resulting from this purification of the juice in the diffuser are physically attached to the pods and are recovered with the spent pulps at the outlet of the diffuser. These impurities are rich in organic matter, in particular pectic, and the additional pulp flow rate they provide, called "plus-pulp", constitutes an important element of the economic interest of the process.

Le but de la présente invention est d'accroître la quantité de "plus-pulpe" produite en diffusion et, par conséquent, d'augmenter encore la rentabilité du procédé de diffusion alcaline.The object of the present invention is to increase the quantity of "plus-pulp" produced in diffusion and, consequently, to further increase the profitability of the alkaline diffusion process.

Le procédé objet de l'invention consiste à renvoyer en diffusion le jus de lessivage, préalablement épulpé et éventuellement préchaulé. Dans le diffuseur et l'échangeur de chaleur placé en tête de la diffusion, les impuretés du jus, éventuellement floculées par préchaulage, se fixent physiquement sur la masse des cossettes et sont récupérées avec les pulpes à la sortie du diffuseur. On augmente ainsi la quantité de "plus-pulpe" et, en contrepartie, on réduit la quantité d'impuretés extraites avec les écumes et, par conséquent, la consommation totale de chaux.The process which is the subject of the invention consists in returning the leaching juice, previously pulped and possibly pre-limed, to diffusion. In the diffuser and the heat exchanger placed at the head of the diffusion, the impurities of the juice, possibly flocculated by pre-liming, physically attach to the mass of the pods and are recovered with the pulps at the outlet of the diffuser. This increases the amount of "over-pulp" and, in return, reduces the amount of impurities extracted with the scum and, therefore, the total consumption of lime.

De préférence, le jus de lessivage sera envoyé dans l'échangeur de chaleur placé en tête de la diffusion, qui peut être incorporé ou non au diffuseur, en respectant les conditions de concentration et de température. Il pourra être introduit en plusieurs points de l'échangeur pour réaliser une croissance satisfaisante de l'alcalinité du jus dans cet appareil.Preferably, the leaching juice will be sent into the heat exchanger placed at the head of the diffusion, which may or may not be incorporated into the diffuser, respecting the conditions of concentration and temperature. It can be introduced at several points of the exchanger to achieve satisfactory growth in the alkalinity of the juice in this device.

La description qui suit se réfère au dessin l'accompagnant qui est le schéma d'une installation pour la mise en oeuvre du procédé de l'invention.The following description refers to the accompanying drawing which is the diagram of an installation for implementing the method of the invention.

Cette installation est constituée essentiellement par un saccharateur 10 et un appareil de diffusion 12 auquel est incorporé ou associé un échangeur de chaleur 14.This installation essentially consists of a saccharator 10 and a diffusion device 12 in which a heat exchanger 14 is incorporated or associated.

Le saccharateur 10 pourra être, par exemple, du type à tapis sans fin, les cossettes étant chargées en A sur le tapis pour former une couche régulière et soumises au traitement de calcification pendant leur transport d'une extrémité à l'autre de l'appareil. En sortant du saccharateur 10, les cossettes sont introduites en B dans l'échangeur de chaleur 14 où elles sont portées à une température convenable, puis transférées dans le diffuseur 12. Les pulpes épuisées sont extraites en C à l'extrémité du diffuseur opposée à celle attenante à l'échangeur de chaleur, et de l'eau est introduite en D à cette extrémité du diffuseur. Les cossettes et l'eau, qui se charge progressivement en sucre, circulent à contre-courant dans le diffuseur et dans l'échangeur et le jus sucré, appelé jus de diffusion, est extrait en E de l'échangeur 14.The saccharator 10 could be, for example, of the endless belt type, the cossettes being loaded in A on the carpet to form a regular layer and subjected to the calcification treatment during their transport from one end to the other of the apparatus. Leaving the saccharator 10, the cossettes are introduced at B into the heat exchanger 14 where they are brought to a suitable temperature, then transferred to the diffuser 12. The spent pulps are extracted at C at the end of the diffuser opposite to that adjacent to the heat exchanger, and water is introduced in D at this end of the diffuser. The cossettes and the water, which gradually loads with sugar, flow against the current in the diffuser and in the exchanger and the sweet juice, called diffusion juice, is extracted at E of the exchanger 14.

Dans le saccharateur 10, les cossettes sont traitées avec du jus saccharaté suivant le procébé faisant l'objet de la demande de brevet n 90/00783 au nom de l'un des demandeurs. Le jus saccharaté est introduit en F, en un point intermédiaire du saccharateur, et divisé en deux courants qui s'écoulent, respectivement, vers l'extrémité amont et vers l'extrémité aval du saccharateur. Dans la partie amont du saccharateur, les circulations du jus et des cossettes s'effectuent globalement en sens inverses. A l'extrémité amont du saccharateur, le jus épuisé ou au moins appauvri en monosaccharate est utilisé pour lessiver les cossettes fraîches. Un recyclage peut être prévu, comme indiqué sur le dessin, pour augmenter le débit de jus de circulation et, par conséquent, l'efficacité du lessivage. La partie du jus non retenue par les cossettes est extraite en G et constitue le jus de lessivage; ce jus est épulpé en 16, puis soumis à un préchaulage progressif en 18 et introduit en H dans l'échangeur de chaleur 14, conformément à l'invention. Cette introduction du jus de lessivage peut être faite en un ou plusieurs points de l'échangeur, en tenant compte des conditions de température et de concentration en chaux. Une partie ou la totalité du jus de lessivage pourrait aussi être introduite dans le diffuseur. Les impuretés organiques du jus de lessivage dont la floculation a été provoquée par le préchaulage se fixent physiquement sur les cossettes dans l'échangeur de chaleur ou le diffuseur et sont récupérées à la sortie du diffuseur avec les pulpes.On peut estimer à 20 % l'augmentation de la quantité de "plus-pulpe" que le procédé de l'invention permet d'obtenir, par rapport au procédé connu où le jus de lessivage était envoyé à l'atelier d'épuration de la sucrerie. Dans certains cas, on pourra se dispenser de préchauler le jus de lessivage avant de l'envoyer en diffusion.In the saccharator 10, the pods are treated with saccharated juice according to the method used in patent application No. 90/00783 in the name of one of the applicants. The saccharated juice is introduced at F, at an intermediate point of the saccharator, and divided into two streams which flow, respectively, towards the upstream end and towards the downstream end of the saccharator. In the upstream part of saccharator, the circulations of the juice and the cossettes are carried out generally in opposite directions. At the upstream end of the saccharator, the exhausted juice or at least depleted in monosaccharate is used to leach fresh pods. Recycling can be provided, as indicated in the drawing, to increase the flow of circulating juice and, consequently, the efficiency of leaching. The part of the juice not retained by the chips is extracted at G and constitutes the leaching juice; this juice is pulped at 16, then subjected to progressive pre-liming at 18 and introduced at H into the heat exchanger 14, in accordance with the invention. This introduction of the leaching juice can be done at one or more points of the exchanger, taking into account the conditions of temperature and lime concentration. Some or all of the leaching juice could also be introduced into the diffuser. The organic impurities in the leaching juice, the flocculation of which has been caused by pre-liming, physically attach to the pods in the heat exchanger or the diffuser and are collected at the outlet of the diffuser with the pulps. We can estimate 20% l increase in the amount of "plus-pulp" that the process of the invention allows to obtain, compared to the known process where the leaching juice was sent to the purification workshop of the sugar refinery. In some cases, we can dispense with pre-liming the leaching juice before sending it for distribution.

Dans la partie aval du saccharateur, les circulations du jus et des cossettes s'effectuent globalement dans le même sens. Le jus extrait à l'extrémité aval du saccharateur peut être utilisé dans la partie amont en mélange avec le jus saccharaté frais.In the downstream part of the saccharator, the circulation of the juice and the pods takes place generally in the same direction. The juice extracted at the downstream end of the saccharator can be used in the upstream part in mixture with the fresh saccharated juice.

Claims (3)

Procédé pour le traitement préliminaire, avant diffusion, des cossettes de betteraves au moyen d'une solution de monosaccharate de calcium comportant un lessivage des cossettes fraîches, caractérisé en ce que le jus de lessivage est envoyé en diffusion.Process for the preliminary treatment, before diffusion, of the beet chips by means of a solution of calcium monosaccharate comprising a leaching of the fresh cossettes, characterized in that the leaching juice is sent in diffusion. Procédé selon la revendication 1, caractérisé en ce que le jus de lessivage est envoyé dans l'échangeur de chaleur placé en tête de l'appareil de diffusion.Method according to claim 1, characterized in that the leaching juice is sent into the heat exchanger placed at the head of the diffusion device. Procédé selon la revendication 1 ou 2, caractérisé en ce que le jus de lessivage est préchaulé avant d'être envoyé en diffusion.Method according to claim 1 or 2, characterized in that the leaching juice is preheated before being sent for diffusion.
EP92400242A 1991-01-31 1992-01-30 Improved preliminary treatments of cossettes before diffusion Expired - Lifetime EP0497699B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9101081 1991-01-31
FR919101081A FR2672302B1 (en) 1991-01-31 1991-01-31 IMPROVED PROCESS FOR THE PRELIMINARY TREATMENT OF COSSETTES BEFORE DISTRIBUTION.

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EP0497699A1 true EP0497699A1 (en) 1992-08-05
EP0497699B1 EP0497699B1 (en) 1994-12-07

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EP92400242A Expired - Lifetime EP0497699B1 (en) 1991-01-31 1992-01-30 Improved preliminary treatments of cossettes before diffusion

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EP (1) EP0497699B1 (en)
AT (1) ATE115190T1 (en)
DE (1) DE69200770T2 (en)
DK (1) DK0497699T3 (en)
ES (1) ES2066565T3 (en)
FR (1) FR2672302B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2638465A1 (en) * 1988-11-03 1990-05-04 France Syndicat Fab Sucre Process and plant for thermal and/or mass transfer between a liquor and fresh sugar beet slices
EP0370869A1 (en) * 1988-11-18 1990-05-30 F C B Diffusion of beet sugar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2638465A1 (en) * 1988-11-03 1990-05-04 France Syndicat Fab Sucre Process and plant for thermal and/or mass transfer between a liquor and fresh sugar beet slices
EP0370869A1 (en) * 1988-11-18 1990-05-30 F C B Diffusion of beet sugar

Also Published As

Publication number Publication date
EP0497699B1 (en) 1994-12-07
ES2066565T3 (en) 1995-03-01
DK0497699T3 (en) 1995-05-29
DE69200770T2 (en) 1995-05-18
FR2672302A1 (en) 1992-08-07
DE69200770D1 (en) 1995-01-19
FR2672302B1 (en) 1994-08-05
ATE115190T1 (en) 1994-12-15

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