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EP0370365B1 - Procédé et appareil de cristallisation en continu du sucre - Google Patents

Procédé et appareil de cristallisation en continu du sucre Download PDF

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Publication number
EP0370365B1
EP0370365B1 EP89121055A EP89121055A EP0370365B1 EP 0370365 B1 EP0370365 B1 EP 0370365B1 EP 89121055 A EP89121055 A EP 89121055A EP 89121055 A EP89121055 A EP 89121055A EP 0370365 B1 EP0370365 B1 EP 0370365B1
Authority
EP
European Patent Office
Prior art keywords
magma
guide plates
chamber
horizontal
chambers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89121055A
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German (de)
English (en)
Other versions
EP0370365A3 (fr
EP0370365A2 (fr
Inventor
Friedrich Dr. Rer. Nat. Dipl.-Chem. Amding
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Individual
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Individual
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Publication of EP0370365A3 publication Critical patent/EP0370365A3/fr
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Publication of EP0370365B1 publication Critical patent/EP0370365B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B30/00—Crystallisation; Crystallising apparatus; Separating crystals from mother liquors ; Evaporating or boiling sugar juice
    • C13B30/02—Crystallisation; Crystallising apparatus
    • C13B30/022—Continuous processes, apparatus therefor

Definitions

  • the present invention relates to a method and an apparatus for continuous sugar crystallization.
  • the known continuous sugar crystallizers are essentially evaporative crystallizers, which can be assigned to the "mixed single apparatus" or “stirred tank cascade” apparatus systems. In both systems there is no defined residence time of the crystals in the individual stirring chambers and therefore no uniform crystal sizes in the product. In addition, local undersaturation or oversaturation is easily given in the evaporative crystallizers because of the locally concentrated heat transfer on the heating surfaces and the associated locally concentrated evaporation. The risk of dissolution or formation of fine grains is great (DE-B-1 188 518, DE-A-2 627 825 and US-A-3 627 582).
  • the object of the present invention is to use a method which avoids these disadvantages.
  • the invention is based on the known methods of continuous vacuum crystallization using a continuous apparatus (tube).
  • This object is achieved in that a sugar solution saturated at higher temperatures (80-120 ° C.) pulsates in cocurrent - with no mixing taking place in any process stage - is continuously cooled by flash evaporation.
  • This cooling is carried out at pressures of approximately 0.9 to 0.03 bar in such a way that optimal supersaturation and thus an optimal crystallization rate is ensured while avoiding secondary nucleation.
  • syrup separated from crystals is recycled in a known manner.
  • crystal nuclei To form crystal nuclei, a very small amount of magma with newly formed very small crystals or crystal nuclei is returned to the appropriately supersaturated sugar solution and mixed intensively with it using static tube mixers.
  • the returned crystals or crystal nuclei are supposed to induce secondary nucleation to the desired extent as seed or excitation crystals.
  • the supersaturation is increased by cooling and thus the nucleation is increased, while it is subsequently reduced or broken off by appropriate heating.
  • Crystal nucleation can e.g. B. be monitored using turbidity measurements.
  • a known type of decanter can be installed downstream of the crystallizer, the decanter being returned and the magma enriched with crystals being fed to the centrifuges.
  • a horizontally lying cylindrical vessel 6 is provided, which is divided into several chambers 7, the individual chambers being delimited from one another by vertical walls 8.
  • FIGS. 3 and 4 The vertical design with a standing cylindrical vessel 10 is shown in FIGS. 3 and 4, in which the individual chambers 10 are delimited against one another by horizontal floors 11 or ceilings 12. If the chambers are directly on top of each other, the ceiling of one chamber forms the floor for the chamber above. If the chambers are separated by spaces 13 on the vertical axis, each chamber has its own floor and ceiling.
  • Baffles are installed in the individual chambers for the horizontal and vertical versions.
  • One group 14 of guide vanes forms a plurality of compartments 15 within a chamber in that they are sealingly connected to the bottom at the bottom and form an overflow weir at the top.
  • the overflow weirs of a chamber result in a cascade, the height of which steps result from the flow properties of the respective magma state or the desired relaxation time.
  • the second group of guide plates 16 is inserted into the compartments of the cascade plates from above.
  • the baffles have an opening 17 at the bottom for underflow and are raised higher as a splash guard, each with sufficient passages for the vapor streams 18.
  • the baffles are installed as parallel vertical plates.
  • the use of concentric cylinders 19 is also possible, and truncated cones tapering downwards can also be used.
  • Both groups of baffles can have dents or bulges 20 which cause a cross-sectional constriction or widening and thus lead to an increase in the pulsation of the magma flow.
  • an outer tube 21 with a control element is provided at the bottom.
  • controllable pumps 26, 27 the thick juice is fed through the static tube mixers and then to the crystallization apparatus 28 as newly formed magma and at the end of the crystallizer against the prevailing vacuum and pumped to the centrifuges 29. Both pumps are controlled according to the level 30, 31 in front of them.
  • the vapor is removed from the top of each chamber to the vacuum pump 34.
  • Control devices are also built into the vapor outlets, with which the vacuum desired in the respective chamber and thus the desired magma temperature are set.
  • the cooling of the magma by relaxation takes place essentially when the weirs overflow in the area of the vapor space.
  • the intensity of relaxation as the magma rises in the upper part of each compartment gradually increases as a result of decreasing fluid pressure and gradually subsides in the descending part.
  • the supersaturation caused by cooling and evaporation enables the crystals to grow evenly especially in the lower part of the chamber. With this method, there can be no local overheating or evaporation concentrations on the heating surfaces or local supercooling on cooling surfaces - effects in other systems. This prevents unwanted oversaturation or undersaturation and eliminates the risk of secondary nucleation or redissolving.
  • the conditions for the desired constant supersaturation during the entire crystallization process are therefore almost optimal.
  • the pulsation causes the layers of liquid to shift relative to one another.
  • the crystals in the magma always become supersaturated
  • the syrup is poured on and the diffusion resistance on the crystal surface is reduced analogously to an agitator effect.
  • the sinking of the crystals - especially on the second half of the way through the crystallizer - causes a relative movement to the syrup and thus a further reduction in the diffusion resistance.
  • Another goal is to avoid the formation of crystal agglomerates and aggregates to produce well-formed single crystals. In the present case this is already taken into account during crystal nucleation. By recycling extremely small crystals for vaccination, they are only slightly larger than the secondary crystal nuclei induced by them.
  • the operation of the apparatus described is much easier compared to the known devices. There are no agitators and no heating chambers. The entire process sequence within the apparatus described is only controlled with a vapor pressure and level control for each chamber.
  • the mechanical production of the crystallization apparatus described is less complex than the known constructions, since it basically consists of a cylindrical vessel with built-in vertical walls.
  • FIGS. 7 and 8 A further embodiment of the chambers, which is extremely advantageous for the crystallization process, is shown in FIGS. 7 and 8, in that the relaxation rate is reduced primarily in the first compartment 15 of each chamber 7 or 10, as a result of which the upward flow rate is greatly reduced.
  • This invention is achieved in that the first compartment of the respective chamber is enlarged to the extent that the following compartments at the expense of the following compartments. There are then at least two compartments 15 in each chamber (FIGS. 7 and 8).
  • baffles 16 ' In order to channel the upward flow if necessary, baffles 16 'can be installed which communicate the flow space through openings in the lower part.
  • the baffles 16 'can also be carried out to the bottom, in which case the magma is inserted between two baffles at 28'. Even with the baffles open at the bottom or in the event that there are no baffles at all, the magma is supplied at several points in the bottom of the chambers for better distribution in the lower region.
  • the pulsating movement in the enlarged sections is essentially caused by the resulting vapor bubbles. But you can also by Shape of the baffles and in the transition areas from one chamber to another are reinforced by the type of flow.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Saccharide Compounds (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (9)

  1. Procédé de cristallisation en continu du sucre au moyen d'un dispositif à passage caractérisé en ce qu'une solution saturée en sucre à haute température, p.e. 80 à 120°C, pulsée en sens unique est refroidie par vaporisation par détente en continu et dans lequel aucune étape du procédé ne fait intervenir une opération de mélange intime.
  2. Procédé selon la revendication 1 caractérisé en ce que pour la formation de germes de cristaux une quantité minime de magma avec de nouveaux cristaux nouvellement formés, c'est à dire des germes de cristaux, sont réintroduits dans la solution saturée en sucre qui défile et sont mélangés avec celle-ci avec un mélangeur statique en ligne.
  3. Dispositif pour appliquer le procédé selon les revendications 1 et 2, caractérisé en ce qu'un récipient cylindrique couché (fig. 1) ou debout (fig. 3 et 4) est divisé en plusieurs chambres (7 resp. 10) et chaque chambre (7) pour la réalisation couchée est délimitée l'une de l'autre par une paroi verticale (8) et , pour la réalisation debout, par un fond horizontal (11) ou couvercle (12) et que les chambres individuelles dans les deux formes de réalisation comprennent des tôles de guidage (14,16).
  4. Dispositif selon la revendication 3 caractérisé en ce que les tôles de guidages (14) à l'intérieur d'une chambre (7 ou 10) forment plusieurs sections, dans lesquelles elles sont hermétiquement reliées au sol resp. à la paroi et forment un barrage au passage, et en conséquence forment une cascade, dont les hauteurs de chute dépendent des propriétés d'écoulement de l'état du magma à cet instant et du temps de détente désiré, alors qu'un second groupe de tôles de guidage (16) est introduit par dessus entre les tôles de cascade (14), de manière telle qu'on obtient un trajet en méandres et un écoulement par le haut du flux de vapeur et que pour la réalisation horizontale ou verticale les tôles de guidage sont parallèles ou parallèles-courbées l'une à l'autre et présentent une forme plate, cylindrique ou en cône tronqué.
  5. Dispositif selon la revendication 4 caractérisé en ce que les tôles de guidage comprennent des bosses ou des indentations (20) analogues.
  6. Dispositif selon la revendication 3 caractérisé en ce que le passage du magma d'une chambre à la suivante est prévu via un tuyau extérieur (21) comprenant un moyen de réglage.
  7. Dispositif pour appliquer le procédé de la revendication 1 caractérisé en ce que l'appareil de cristallisation couché ou debout est muni d'un ou de plusieurs mélangeurs en ligne statique (23) avec une enveloppe de refroidissement ou de chauffage (24, 25).
  8. Dispositif selon la revendication 2 caractérisé en ce que, à la place du magma réintroduit, on introduit une boue ou selon le cas de l'air de manière uniforme ou intermittente dans le mélangeur statique en ligne.
  9. Dispositif selon la revendication 3 caractérisé en ce que la première section (15') de chaque chambre (7,10) est agrandie au détriment de la section suivante de telle manière qu'il est prévu tout au plus seulement deux sections dans une chambre, dans laquelle les tôles de guidage (16') éventuellement nécessaires dans chaque section sont installées , s'étendant jusqu'au fond ou présentant des ouvertures et l'introduction du magma se produit dans le premier cas entre les tôles de guidage (14') et à plusieurs endroits (28') du fond.
EP89121055A 1988-11-19 1989-11-14 Procédé et appareil de cristallisation en continu du sucre Expired - Lifetime EP0370365B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839182 1988-11-19
DE3839182A DE3839182A1 (de) 1988-11-19 1988-11-19 Verfahren und vorrichtung zur kontinuierlichen zuckerkristallisation

Publications (3)

Publication Number Publication Date
EP0370365A2 EP0370365A2 (fr) 1990-05-30
EP0370365A3 EP0370365A3 (fr) 1991-02-13
EP0370365B1 true EP0370365B1 (fr) 1995-08-30

Family

ID=6367507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121055A Expired - Lifetime EP0370365B1 (fr) 1988-11-19 1989-11-14 Procédé et appareil de cristallisation en continu du sucre

Country Status (2)

Country Link
EP (1) EP0370365B1 (fr)
DE (2) DE3839182A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19535017C1 (de) * 1995-09-21 1996-11-28 Braunschweigische Masch Bau Verfahren und Vorrichtung zur kontinuierlichen Herstellung von Impfkristallen
DE102016101217A1 (de) 2016-01-25 2017-07-27 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren zur Gewinnung von Kristallen aus einer Mutterlösung und dafür geeigneter Kristallisationsapparat
DE102019123903B4 (de) 2019-09-05 2023-01-12 Bma Braunschweigische Maschinenbauanstalt Ag Kühlungskristallisator und Verfahren zur Zuckerkristallisation
RU206994U1 (ru) * 2021-02-24 2021-10-05 Общество с ограниченной ответственностью "ВОКСТЭК" Кристаллизатор пульсационный

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160533A (en) * 1936-01-11 1939-05-30 Werkspoor Nv Apparatus for continuously crystallizing solutions by evaporation or cooling
DE1188518B (de) * 1959-07-22 1965-03-04 Friedrich Amding Dipl Chem Dr Vorrichtung zum kontinuierlichen Verkochen und Kristallisieren von Zuckersaeften
FR1581088A (fr) * 1968-07-17 1969-09-12
JPS521045A (en) * 1975-06-24 1977-01-06 Hitachi Ltd Process for preparing sugar continuously
DE3221316A1 (de) * 1982-06-05 1983-12-08 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter Verfahren und vorrichtung zur kuehlung von zuckerfuellmasse in einer stehenden maische

Also Published As

Publication number Publication date
DE3839182A1 (de) 1990-05-31
EP0370365A3 (fr) 1991-02-13
DE58909409D1 (de) 1995-10-05
EP0370365A2 (fr) 1990-05-30

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