EP1063302B1 - Process for extracting sugar syrup - Google Patents

Process for extracting sugar syrup Download PDF

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Publication number
EP1063302B1
EP1063302B1 EP00401790A EP00401790A EP1063302B1 EP 1063302 B1 EP1063302 B1 EP 1063302B1 EP 00401790 A EP00401790 A EP 00401790A EP 00401790 A EP00401790 A EP 00401790A EP 1063302 B1 EP1063302 B1 EP 1063302B1
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EP
European Patent Office
Prior art keywords
pressing
juice
sweet juice
extraction
pressing means
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EP00401790A
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German (de)
French (fr)
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EP1063302A1 (en
Inventor
Robert Guyot
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Fonderies et Ateliers L Choquenet SA
Maguin SAS
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Fonderies et Ateliers L Choquenet SA
Maguin SAS
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    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • 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
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B20/00—Purification of sugar juices
    • C13B20/16—Purification of sugar juices by physical means, e.g. osmosis or filtration

Definitions

  • the present invention relates generally to a process for extracting a sweet juice from beet or chicory, and more particularly to an extraction process in which only two successive pressing extraction stages are used.
  • the conventional diffusion processes of the prior art employ extractors in which sugar beet chips are passed countercurrently and a high temperature extraction solvent such as hot water, the sugar being extracted by diffusion. without pressing the chips.
  • the contact time must be relatively long, which requires extractors of great length and to maintain the extraction solvent such as water at an elevated temperature over the entire extraction zone; for example at a temperature of the order of 70 ° C.
  • German DE 736 734 discloses a method of extracting a sugar juice from beets wherein the beets are baked at about 90 ° C prior to the first pass stage to soften the cells.
  • the present invention aims to provide a process for extracting a sweet juice from sugar beet or chicory requiring a less expensive infrastructure, a lower energy cost and resulting in a lack of CO 2 discharge in the atmosphere at the level of purification.
  • the process of the invention makes it possible to obtain a sugar juice of better quality than the diffusion processes of the prior art since, requiring lower temperatures, the reduced oxidation of the raw material avoids the need for solution of undesirable undesirable products and limits the microbial developments with consequent very low levels of organic compounds in the sweetened juices obtained.
  • a process for extracting a final sweet juice from beetroot or chicory comprises only two successive stages of extraction by pressing.
  • a first step of extraction by pressing comprises the passage in a first pressing means of a fresh grating optionally supplemented with water or at least a fraction of the second sweet juice producing a first sweet juice and a first pressed raspberry.
  • a second step of extraction by pressing comprises the passage in a second pressing means consisting of at least one membrane filter presses and cyclic operation of a second feed mixture comprising the first pressed rasp from the first means pressing and a predetermined amount of water.
  • a sieving step of the first sweet juice leads to the final sweet juice and a solid refusal.
  • the second pressing means is constituted by several filter presses with membrane plates and cyclic operation, for example two, arranged in parallel.
  • the process for extracting a sweet juice from sugar beet or chicory comprises two pressing extraction stages PR1, FP, arranged in series, the first press extraction stage PR1 being fed by a feed mixture A0 containing fresh R0 rapier and outputting a first sweet juice J1 and a first pressed rasp R1, and the second extraction stage FP receiving a feed mixture A1 containing the first raspberry pressed R1 and outputting a second sweet juice J2 and a second pressed rasp R2.
  • the first extraction stage comprises a PR1 press, for example a bi-screw type press fed by a G1 flared feed chute, of sufficient size to allow a good feeding of the press and such a perfect balance. as much as possible between the sugar concentration of the cellulosic phase and the liquid phase with a feed mixture A0 containing fresh rape R0 of sugar beet or chicory and at least a part of the second sweet juice J2 from the second stage d extraction by pressing FP.
  • a raspberry that is to say a beet raw material or chicory reduced to size particles average of 1 to 10 mm, preferably 2 to 4 mm, unlike the chips usually used promotes extraction of sugar cells by leaching / pressing operation.
  • the first rasp pressed and partially depleted R1 from the first press PR1, optionally mixed with a solid rejection recovered from the first sweet juice J1 and a portion J "2 of the second sweet juice J2, as will be seen more specifically below is generally added with a predetermined amount of water to form the feed mixture A1 of the second press extraction stage FP.
  • this second press extraction stage which is constituted by at least one membrane filter press and cyclic operation FP, the feed mixture A1 is cyclically filtered and then pressed to obtain a second sweet juice J2 and a second grating.
  • pressed R2 which is evacuated for storage and processing usually in livestock feed.
  • the filter press FP operates in successive cycles of filtration and pressing.
  • a fraction Je2 of the second sweet juice J2 is separated by filtration from the first pressed rasp R1 which accumulates in the form of cakes on the membranous plates of the filter press.
  • This first fraction Je2 of the second sweet juice J2 is recovered in a tank B'2 and pumped by means of a pump P'2 to be mixed with the fresh rasp R0 to form the feed mixture A0 of the first stage of PR1 extraction.
  • the grating cakes on the membrane trays of the filter press FP are pressed to extract an additional fraction J "2 of the second sweet juice, and the second pressed rasp R2 is removed from the filter -press and conveyed, for example by a conveyor belt, to a place of storage.
  • This second fraction J "2 of the second sweet juice J2 is recovered in a tank B" 2 and pumped by a pump P "2 for preference mixed with the first pressed rasp R1 in order to form the feed mixture A1 of the second extraction stage by pressing constituted by the filter press FP.
  • the first juice J1 sweetened from the first pressing extraction stage PR1 is collected in a tray B1 and then pumped by means of a pump P1 on a sieve T to separate from this first sweet juice J1 a final sweet juice JS and a solid RF refusal .
  • the solid rejection is also mixed with the first pressed rasp R1 from the first press extraction stage PR1 to form the feed mixture A1 of the second press extraction stage FP.
  • the sweet juice JS from the first press extraction stage PR1 is recovered, purified and treated in a conventional manner.
  • the final juice treated is then decanted and the clear juice obtained is, as is conventional, sulphited then filtered.
  • the first pressed rasp R1, the solid RF rejection of the sieve T and the fraction J "2 of the second sweet juice J2 are mixed in a mixer M1, pumped and added with a predetermined amount of water to form the feed mixture A1 of the second extraction stage by pressing constituted by the filter press FP.
  • a complementary quantity of water is added to ensure the de-sugaring of the grating cakes in the filter press (from 100 to 500 kg of water / ton of beet).
  • This water is generally introduced at a temperature ranging from 30 to 90 ° C., preferably at a temperature of the order of 60 ° C.
  • This water can be introduced only at the level of the feed of the second extraction stage by pressing constituted by the press filter FP (desugar function) or can be introduced in addition to the level of the feed of the filter press FP, in several other points of the installation, for example in the tray B "2 of recovery of the fraction J" 2 of the second sweet juice J2 or in the tray B'2 of recovery of the fraction J'2 of the second sweet juice J2, or in the tray Ml.
  • the fractions Je 2 and J "2 of the second sweet juice J 2 are used in a differentiated, one could mix these fractions and use them simply to be mixed with R0 fresh grated.
  • the described differentiated use of the fractions of the second sweet juice J2 makes it possible to ensure better efficiency in the extraction process.
  • a heating step of the second sweet juice J2 may be provided for example by means of a heater to adjust the temperature of the grating in the first extraction stage PR1.
  • Mass flow rate of fresh R0 raspberry 1,400 kg / hour Mass flow rate of the first pressed rasp R1: 500 kg / hour Mass flow rate of second pressed rasp R2: 250 kg / hour Mass flow rate of water: 500 kg / hour Mixing temperature: 40 to 50 ° C

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Non-Alcoholic Beverages (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Saccharide Compounds (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Medicines Containing Plant Substances (AREA)

Abstract

Extraction of a sweetened juice from freshly grated sugar beet or chicory comprises successive extracting by pressing at least twice, optionally with water. Extraction of a sweetened juice from freshly grated sugar beet or chicory comprises successive extracting by pressing several times in a first step using a first pressing means and optionally adding water and a second juice and a second pressing step of a food mixture comprising the first pressed juice and water mixture using a membrane filter press having cyclic movement. An Independent claim is included for the apparatus used comprising a pressing means in series with a second pressing means comprising a filter press(es) with membrane plates and cyclical operation.

Description

La présente invention concerne d'une manière générale un procédé d'extraction d'un jus sucré à partir de betteraves ou chicorée, et plus particulièrement un procédé d'extraction dans lequel on utilise seulement deux étages d'extraction par pressage successifs.The present invention relates generally to a process for extracting a sweet juice from beet or chicory, and more particularly to an extraction process in which only two successive pressing extraction stages are used.

Les procédés classiques de diffusion de l'art antérieur emploient des extracteurs dans lesquels on fait passer à contre-courant des cossettes de betteraves sucrières et un solvant d'extraction à haute température tel que de l'eau chaude, le sucre étant extrait par diffusion sans qu'il y ait pressage des cossettes.The conventional diffusion processes of the prior art employ extractors in which sugar beet chips are passed countercurrently and a high temperature extraction solvent such as hot water, the sugar being extracted by diffusion. without pressing the chips.

Pour obtenir une extraction convenable, le temps de contact doit être relativement long, ce qui nécessite des extracteurs de grande longueur et de maintenir le solvant d'extraction tel que l'eau à une température élevée sur la totalité de la zone d'extraction ; par exemple à une température de l'ordre de 70°C.To obtain a suitable extraction, the contact time must be relatively long, which requires extractors of great length and to maintain the extraction solvent such as water at an elevated temperature over the entire extraction zone; for example at a temperature of the order of 70 ° C.

Ces exigences font que les coûts d'infrastructure et les coûts d'exploitation, en particulier en ce qui concerne le bilan énergétique, sont élevés.These requirements mean that infrastructure costs and operating costs, particularly with regard to the energy balance, are high.

En outre, ces procédés classiques se traduisent par un rejet important de CO2 dans l'atmosphère, du fait de l'épuration calco-carbonique classique du jus sucré obtenu.In addition, these conventional processes result in a significant release of CO 2 into the atmosphere, due to the conventional calco-carbonic purification of the sweet juice obtained.

La demande de brevet français FR-A-2 502 909 (Alsthom-Atlantique) décrit un procédé d'extraction de sucre à partir du topinambour.The patent application French FR-A-2 502 909 (Alsthom-Atlantique) describes a sugar extraction process from Jerusalem artichoke.

Le brevet allemand DE 736 734 (Gattner ) décrit un procédé d'extraction d'un jus sucré à partir de betteraves dans lequel les betteraves sont cuites à environ 90°C avant la première étape de passage afin de ramollir les cellules.The patent German DE 736 734 (Gattner ) discloses a method of extracting a sugar juice from beets wherein the beets are baked at about 90 ° C prior to the first pass stage to soften the cells.

Enfin, le contenu de la demande de brevet européen EP-A-1 022 342 (Maguin ), publiée le 26 juillet 2000 peut être considéré comme faisant partie de l'état de la technique à prendre en compte au titre de la nouveauté selon les dispositions de l'Article 54(3)CBE. Mais l'installation décrite dans ce document utilise des presses classiques avec des cloisons minces non filtrantes. De plus, le procédé décrit ne comprend pas de cycle d'extraction par filtrage permettant de récupérer une fraction du second jus sucré d'une première presse et de la mélanger à la râpure alimentant une seconde presse.Finally, the content of the patent application European EP-A-1,022,342 (Maguin ), published on 26 July 2000, may be considered as part of the state of the art to be taken into account under novelty under the provisions of Article 54 (3) EPC. But the installation described in this document uses conventional presses with non-filtering thin walls. In addition, the method described does not include a filter extraction cycle for recovering a fraction of the second sweet juice of a first press and to mix with the grating feeding a second press.

La présente invention a pour objet de fournir un procédé d'extraction d'un jus sucré à partir de betteraves sucrières ou de chicorée nécessitant une infrastructure moins coûteuse, un coût énergétique moindre et qui se traduit par une absence de rejet de CO2 dans l'atmosphère au niveau de l'épuration.The present invention aims to provide a process for extracting a sweet juice from sugar beet or chicory requiring a less expensive infrastructure, a lower energy cost and resulting in a lack of CO 2 discharge in the atmosphere at the level of purification.

En outre, le procédé de l'invention permet l'obtention d'un jus sucré de meilleure qualité que les procédés de diffusion de l'art antérieur car nécessitant de plus faibles températures, l'oxydation réduite de la matière première évite la mise en solution de produits non sucrés indésirables et limite les développements microbiens avec pour conséquences des teneurs très réduites en composés organiques dans les jus sucrés obtenus.In addition, the process of the invention makes it possible to obtain a sugar juice of better quality than the diffusion processes of the prior art since, requiring lower temperatures, the reduced oxidation of the raw material avoids the need for solution of undesirable undesirable products and limits the microbial developments with consequent very low levels of organic compounds in the sweetened juices obtained.

Tel qu'il est revendiqué un procédé d'extraction d'un jus sucré final à partir de betteraves ou de chicorée comprend uniquement deux étapes successives d'extraction par pressage.As claimed, a process for extracting a final sweet juice from beetroot or chicory comprises only two successive stages of extraction by pressing.

Une première étape d'extraction par pressage comprend le passage dans un premier moyen de pressage d'une râpure fraîche éventuellement additionnée d'eau ou d'au moins une fraction du second jus sucré produisant un premier jus sucré et une première râpure pressée.A first step of extraction by pressing comprises the passage in a first pressing means of a fresh grating optionally supplemented with water or at least a fraction of the second sweet juice producing a first sweet juice and a first pressed raspberry.

Une seconde étape d'extraction par pressage comprend le passage dans un second moyen de pressage constitué d'au moins un filtre-presse à plateaux membranés et à fonctionnement cyclique d'un second mélange d'alimentation comprenant la première râpure pressée issue du premier moyen de pressage et une quantité d'eau prédéterminée.A second step of extraction by pressing comprises the passage in a second pressing means consisting of at least one membrane filter presses and cyclic operation of a second feed mixture comprising the first pressed rasp from the first means pressing and a predetermined amount of water.

Une étape de tamisage du premier jus sucré conduit au jus sucré final et à un refus solide.A sieving step of the first sweet juice leads to the final sweet juice and a solid refusal.

Dans une réalisation recommandée de l'invention, le second moyen de pressage est constitué par plusieurs filtres-presses à plateaux membranes et fonctionnement cyclique, par exemple deux, agencés en parallèle.In a preferred embodiment of the invention, the second pressing means is constituted by several filter presses with membrane plates and cyclic operation, for example two, arranged in parallel.

La suite de la description se réfère à la figure unique annexée qui représente une vue schématique d'une réalisation d'une installation de mise en oeuvre du procédé d'extraction selon l'invention.The remainder of the description refers to the single appended figure which represents a schematic view of an embodiment of an installation for implementing the extraction method according to the invention.

En se référant à cette figure, le procédé d'extraction d'un jus sucré à partir de betteraves sucrières ou de chicorée comprend deux étages d'extraction par pressage PR1, FP, agencés en série, le premier étage d'extraction par pressage PR1 étant alimenté par un mélange d'alimentation A0 contenant de la râpure fraîche R0 et fournissant en sortie un premier jus sucré J1 et une première râpure pressée R1, et le second étage d'extraction FP recevant un mélange d'alimentation A1 contenant la première râpure pressée R1 et fournissant en sortie un second jus sucré J2 et une seconde râpure pressée R2.Referring to this figure, the process for extracting a sweet juice from sugar beet or chicory comprises two pressing extraction stages PR1, FP, arranged in series, the first press extraction stage PR1 being fed by a feed mixture A0 containing fresh R0 rapier and outputting a first sweet juice J1 and a first pressed rasp R1, and the second extraction stage FP receiving a feed mixture A1 containing the first raspberry pressed R1 and outputting a second sweet juice J2 and a second pressed rasp R2.

Plus précisément, le premier étage d'extraction comprend une presse PR1, par exemple une presse de type bi-vis alimentée par une goulotte verticale d'alimentation évasée G1, de taille suffisante pour permettre un bon gavage de la presse et un équilibre aussi parfait que possible entre la concentration en sucre de la phase cellulosique et de la phase liquide avec un mélange d'alimentation A0 contentant de la râpure fraîche R0 de betteraves sucrières ou de chicorée et au moins une partie du second jus sucré J2 issu du second étage d'extraction par pressage FP. L'utilisation d'une râpure, c'est-à-dire d'une matière première de betteraves ou chicorée réduite en particules de taille moyenne de 1 à 10 mm, de préférence 2 à 4 mm, contrairement aux cossettes habituellement utilisées favorise l'extraction du sucre des cellules par opération de lessivage / pressage.More specifically, the first extraction stage comprises a PR1 press, for example a bi-screw type press fed by a G1 flared feed chute, of sufficient size to allow a good feeding of the press and such a perfect balance. as much as possible between the sugar concentration of the cellulosic phase and the liquid phase with a feed mixture A0 containing fresh rape R0 of sugar beet or chicory and at least a part of the second sweet juice J2 from the second stage d extraction by pressing FP. The use of a raspberry, that is to say a beet raw material or chicory reduced to size particles average of 1 to 10 mm, preferably 2 to 4 mm, unlike the chips usually used promotes extraction of sugar cells by leaching / pressing operation.

La première râpure pressée et partiellement épuisée R1 issue de la première presse PR1, éventuellement mélangée avec un refus solide récupéré à partir du premier jus sucré J1 et une partie J"2 du second jus sucré J2, comme on le verra plus précisément ci-dessous, est en général additionnée d'une quantité prédéterminée d'eau pour former le mélange d'alimentation A1 du second étage d'extraction par pressage FP.The first rasp pressed and partially depleted R1 from the first press PR1, optionally mixed with a solid rejection recovered from the first sweet juice J1 and a portion J "2 of the second sweet juice J2, as will be seen more specifically below is generally added with a predetermined amount of water to form the feed mixture A1 of the second press extraction stage FP.

Dans ce second étage d'extraction par pressage, qui est constitué par au moins un filtre-presse à plateaux membranés et fonctionnement cyclique FP, le mélange d'alimentation A1 est cycliquement filtré puis pressé pour obtenir un second jus sucré J2 et une seconde râpure pressée R2 qui est évacuée en vue de son stockage et de sa transformation généralement en aliments pour bétail.In this second press extraction stage, which is constituted by at least one membrane filter press and cyclic operation FP, the feed mixture A1 is cyclically filtered and then pressed to obtain a second sweet juice J2 and a second grating. pressed R2 which is evacuated for storage and processing usually in livestock feed.

Plus précisément, comme cela est bien connu, le filtre-presse FP fonctionne par cycles successifs de filtration et de pressage. Lors du cycle de fonctionnement en filtration du filtre-presse FP, une fraction J'2 du second jus sucré J2 est séparée par filtration de la première râpure pressée R1 qui s'accumule sous forme de gâteaux sur les plateaux membranés du filtre-presse. Cette première fraction J'2 du second jus sucré J2 est récupérée dans un bac B'2 et pompée au moyen d'une pompe P'2 pour être mélangée à la râpure fraîche R0 pour former le mélange d'alimentation A0 du premier étage d'extraction PR1. Lors du cycle de compression du filtre-presse, les gâteaux de râpure sur les plateaux à membranes du filtre-presse FP sont pressés pour en extraire une fraction supplémentaire J"2 du second jus sucré, puis la seconde râpure pressée R2 est évacuée du filtre-presse et convoyée, par exemple par un tapis roulant, jusqu'à un lieu de stockage. Cette seconde fraction J"2 du second jus sucré J2 est récupérée dans un bac B"2 et pompée par une pompe P"2 pour de préférence être mélangée avec la première râpure pressée R1 en vue de former le mélange d'alimentation A1 du second étage d'extraction par pressage constitué par le filtre-presse FP. Comme le montre la figure, le premier jus sucré J1 issu du premier étage d'extraction par pressage PR1 est recueilli dans un bac B1 puis pompé au moyen d'une pompe P1 sur un tamis T afin de séparer de ce premier jus sucré J1 un jus sucré final JS et un refus solide RF.More specifically, as is well known, the filter press FP operates in successive cycles of filtration and pressing. During the filtration operating cycle of the filter press FP, a fraction Je2 of the second sweet juice J2 is separated by filtration from the first pressed rasp R1 which accumulates in the form of cakes on the membranous plates of the filter press. This first fraction Je2 of the second sweet juice J2 is recovered in a tank B'2 and pumped by means of a pump P'2 to be mixed with the fresh rasp R0 to form the feed mixture A0 of the first stage of PR1 extraction. During the compression cycle of the filter press, the grating cakes on the membrane trays of the filter press FP are pressed to extract an additional fraction J "2 of the second sweet juice, and the second pressed rasp R2 is removed from the filter -press and conveyed, for example by a conveyor belt, to a place of storage.This second fraction J "2 of the second sweet juice J2 is recovered in a tank B" 2 and pumped by a pump P "2 for preference mixed with the first pressed rasp R1 in order to form the feed mixture A1 of the second extraction stage by pressing constituted by the filter press FP. As shown in the figure, the first juice J1 sweetened from the first pressing extraction stage PR1 is collected in a tray B1 and then pumped by means of a pump P1 on a sieve T to separate from this first sweet juice J1 a final sweet juice JS and a solid RF refusal .

De préférence, le refus solide est mélangé également avec la première râpure pressée R1 issue du premier étage d'extraction par pressage PR1 pour former le mélange d'alimentation A1 du second étage d'extraction par pressage FP.Preferably, the solid rejection is also mixed with the first pressed rasp R1 from the first press extraction stage PR1 to form the feed mixture A1 of the second press extraction stage FP.

Le jus sucré JS issu du premier étage d'extraction par pressage PR1 est récupéré, épuré et traité de manière classique. Toutefois, avec le procédé de l'invention, il est possible d'utiliser une épuration simplifiée du jus final JS par coagulation / floculation avec une très petite quantité de chaux (1 à 3 g/ litre) au lieu d'une épuration calcocarbonique classique. Le jus final traité est alors décanté et le jus clair obtenu est, comme cela est classique, sulfité puis filtré.The sweet juice JS from the first press extraction stage PR1 is recovered, purified and treated in a conventional manner. However, with the process of the invention, it is possible to use a simplified purification of the final juice JS by coagulation / flocculation with a very small amount of lime (1 to 3 g / liter) instead of a conventional calcocarbonic purification. . The final juice treated is then decanted and the clear juice obtained is, as is conventional, sulphited then filtered.

Comme le montre la figure, la première râpure pressée R1, le refus solide RF du tamis T et la fraction J"2 du second jus sucré J2 sont mélangés dans un mélangeur M1, pompés et additionnés d'une quantité prédéterminée d'eau pour former le mélange d'alimentation A1 du second étage d'extraction par pressage constitué par le filtre-presse FP.As shown in the figure, the first pressed rasp R1, the solid RF rejection of the sieve T and the fraction J "2 of the second sweet juice J2 are mixed in a mixer M1, pumped and added with a predetermined amount of water to form the feed mixture A1 of the second extraction stage by pressing constituted by the filter press FP.

Une quantité complémentaire d'eau est ajoutée pour assurer le désucrage des gâteaux de râpure dans le filtre-presse (de 100 à 500 kg d'eau / tonne de betteraves). Cette eau est généralement introduite à une température variant de 30 à 90°C, de préférence à une température de l'ordre de 60°C. Cette eau peut être introduite uniquement au niveau de l'alimentation du second étage d'extraction par pressage constitué par le filtre-presse FP (fonction de désucrage) ou peut être introduite en plus du niveau de l'alimentation du filtre-presse FP, en plusieurs autres points de l'installation, par exemple dans le bac B"2 de récupération de la fraction J"2 du second jus sucré J2 ou encore dans le bac B'2 de récupération de la fraction J'2 du second jus sucré J2, ou encore dans le bac Ml.A complementary quantity of water is added to ensure the de-sugaring of the grating cakes in the filter press (from 100 to 500 kg of water / ton of beet). This water is generally introduced at a temperature ranging from 30 to 90 ° C., preferably at a temperature of the order of 60 ° C. This water can be introduced only at the level of the feed of the second extraction stage by pressing constituted by the press filter FP (desugar function) or can be introduced in addition to the level of the feed of the filter press FP, in several other points of the installation, for example in the tray B "2 of recovery of the fraction J" 2 of the second sweet juice J2 or in the tray B'2 of recovery of the fraction J'2 of the second sweet juice J2, or in the tray Ml.

Bien que de préférence, comme décrit précédemment, les fractions J'2 et J"2 du second jus sucré J2 soient utilisées de façon différenciée, on pourrait mélanger ces fractions et les utiliser simplement pour être mélangées avec la râpure fraîche R0. Toutefois, l'utilisation différenciée décrite des fractions du second jus sucré J2 permet d'assurer une meilleure efficacité au procédé d'extraction.Although preferably, as previously described, the fractions Je 2 and J "2 of the second sweet juice J 2 are used in a differentiated, one could mix these fractions and use them simply to be mixed with R0 fresh grated. However, the described differentiated use of the fractions of the second sweet juice J2 makes it possible to ensure better efficiency in the extraction process.

En variante, on pourrait utiliser à la place de l'unique filtre-presse représenté, plusieurs filtres-presses fonctionnant en parallèle, par exemple deux filtres-presses, pour assurer une continuité de débit.As a variant, it would be possible to use, in place of the single filter-press shown, several filter presses operating in parallel, for example two filter-presses, to ensure flow continuity.

Eventuellement, on peut prévoir une étape de réchauffage du second jus sucré J2 par exemple au moyen d'un réchauffeur afin de régler la température de la râpure dans le premier étage d'extraction PR1.Optionally, a heating step of the second sweet juice J2 may be provided for example by means of a heater to adjust the temperature of the grating in the first extraction stage PR1.

Exemple : Example :

On a fait fonctionner l'installation décrite ci-dessus dans les conditions suivantes : Débit massique de râpure fraîche R0 : 1 400 kg/heure Débit massique de la première râpure pressée R1 : 500 kg/heure Débit massique de la seconde râpure pressée R2 : 250 kg/heure Débit massique d'eau : 500 kg/heure Température du mélange : 40 à 50°C The plant described above was operated under the following conditions: Mass flow rate of fresh R0 raspberry: 1,400 kg / hour Mass flow rate of the first pressed rasp R1: 500 kg / hour Mass flow rate of second pressed rasp R2: 250 kg / hour Mass flow rate of water: 500 kg / hour Mixing temperature: 40 to 50 ° C

Après traitement du jus sucré J1 tamisé avec du bisulfite à un débit de bisulfite MA à 20 kg/heure, on a obtenu un jus sucré final ayant une pureté de 86 %. La teneur en sucre de la seconde râpure pressée R2 était de 0,55 % en poids.After treatment of sweet juice J1 sieved with bisulphite at a rate of bisulphite MA at 20 kg / hr, a final sweet juice with a purity of 86% was obtained. The sugar content of the second pressed rasp R2 was 0.55% by weight.

Claims (7)

  1. Method for extracting a sweet final juice from beets or chicory, characterized in that it comprises:
    only two successive steps of extraction by pressing:
    - a first step of extraction by pressing comprising the passage into a first pressing means (PR1) of a fresh pulp (R0) to which water or at least a fraction of the second sweet juice (J2) is optionally added, producing a first sweet juice (J1) and a first pressed pulp (R1),
    - a second step of extraction by pressing comprising the passage, into a second pressing means (FP) consisting of at least one membrane filter press having cyclic operation, of a second feed mixture (A1) comprising the first pressed pulp (R1) issuing from the first pressing means (PR1) and a predefined quantity of water,
    and a step of straining of the first sweet juice (J1) yielding the final sweet juice (JS) and a solid waste (RF).
  2. Method according to Claim 1, characterized in that the first pressing means is a twin-screw press.
  3. Method according to either of Claims 1 and 2, characterized in that the second pressing means (FP) consists of a plurality of membrane filter presses having cyclic operation and arranged in parallel.
  4. Method according to any one of Claims 1 to 3, characterized in that the solid waste (RF) is added to the second feed mixture (A1).
  5. Method according to any one of Claims 1 to 4, characterized in that the second pressing means (FP) operates by successive filtration and pressing cycles respectively producing a second strained sweet juice (J'2) and a second pressed sweet juice (J"2) and in that the fraction of the second sweet juice (J2) added to the first feed mixture (A0) is the second strained sweet juice (J'2).
  6. Method according to Claim 5, characterized in that the second pressed sweet juice (J"2) is added to the second feed mixture (A1).
  7. Method according to one of the preceding claims, using an installation comprising a pressing assembly exclusively comprising a first pressing means (PR1) in series with a second pressing means (FP) consisting of one or more membrane filter presses and having cyclic operation in parallel, and also a strainer (T).
EP00401790A 1999-06-25 2000-06-22 Process for extracting sugar syrup Expired - Lifetime EP1063302B1 (en)

Applications Claiming Priority (2)

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FR9908178 1999-06-25
FR9908178A FR2795428B1 (en) 1999-06-25 1999-06-25 PROCESS AND PLANT FOR EXTRACTING SUGAR JUICE

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EP1063302B1 true EP1063302B1 (en) 2008-04-16

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Publication number Priority date Publication date Assignee Title
FR2928817B1 (en) * 2008-03-19 2010-12-17 Ecopsi PROCESS AND UNIT FOR PRODUCING BEETS AND JUICE SUGAR FROM BEETS
CN102766702B (en) * 2012-07-24 2014-04-02 广西大学 High-speed sedimentation device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022342A1 (en) * 1999-01-21 2000-07-26 Maguin S.A. Process and unit for extracting a sugar juice from beet or chicory

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736734C (en) * 1939-07-02 1943-06-25 Fraembs & Freudenberg Process for juicing sugar beets
IT1132675B (en) * 1980-09-05 1986-07-02 Ital Ind Degli Zuccheri EXTRACTION PROCESS OF BEET SUGAR, IMPINED FOR ITS REALIZATION, RAW SUGAR SAUCE AND BEET SUGAR IN SUCH MANNER
FR2502909B1 (en) * 1981-04-03 1985-05-31 Alsthom Atlantique PROCESS FOR THE EXTRACTION OF JUICE FROM TUBERS, ESPECIALLY TOPINAMBOURS AND INSTALLATION IMPLEMENTING THE PROCESS
AT401776B (en) * 1989-03-10 1996-11-25 Agrana Zucker Gmbh MULTI-STAGE METHOD FOR PRODUCING SUGAR FROM SUGAR BEET

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022342A1 (en) * 1999-01-21 2000-07-26 Maguin S.A. Process and unit for extracting a sugar juice from beet or chicory

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FR2795428A1 (en) 2000-12-29
DE60038592D1 (en) 2008-05-29
ES2304933T3 (en) 2008-11-01
ATE392487T1 (en) 2008-05-15
FR2795428B1 (en) 2001-08-31
EP1063302A1 (en) 2000-12-27
DE60038592T2 (en) 2009-05-07

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