EP0473956A1 - Process for graining by the cristallization of a thick juice - Google Patents

Process for graining by the cristallization of a thick juice Download PDF

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Publication number
EP0473956A1
EP0473956A1 EP91113250A EP91113250A EP0473956A1 EP 0473956 A1 EP0473956 A1 EP 0473956A1 EP 91113250 A EP91113250 A EP 91113250A EP 91113250 A EP91113250 A EP 91113250A EP 0473956 A1 EP0473956 A1 EP 0473956A1
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EP
European Patent Office
Prior art keywords
juice
crystallization
sugar
rotor
withdrawn
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.)
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Application number
EP91113250A
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German (de)
French (fr)
Inventor
Georg Dipl.-Ing. Osthaus
Hans-Joachim Dipl.-Ing. Praus
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BWS Technologie GmbH
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Dorr Oliver Deutschland GmbH
Krupp Buckau Maschinenbau GmbH
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Application filed by Dorr Oliver Deutschland GmbH, Krupp Buckau Maschinenbau GmbH filed Critical Dorr Oliver Deutschland GmbH
Publication of EP0473956A1 publication Critical patent/EP0473956A1/en
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    • 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

Definitions

  • the invention relates to a process for grain formation in the crystallization of a thick sugar juice into a filling mass by adding inoculated sugar of a comminuted fine sugar.
  • the vaccination of the sugar juice can be done by suddenly drawing in air, whereby the formation of the seed crystal is caused by a shock. With this procedure, mixed crystals are formed, which leads to a different grain spectrum within the filling compound.
  • the invention has for its object to provide a simple method for grain formation, with which a seed sugar is created with a uniform grain size.
  • This object is achieved in that a part is withdrawn from the crystallized filling compound, crushed and returned to the crystallization as inoculated sugar in a closed system inline.
  • the filling compound After the crystallization of sucrose, larger crystals are present in a natural aqueous system, the filling compound.
  • the part branched off from the filling compound is comminuted and returned within a bypass, so that the desired, simple procedure is created.
  • a uniform seed grain of approx. 30 my can be produced in its shear field.
  • the filling compound drawn off from the crystallization forms a natural aqueous system. If the liquid portion is not sufficient to comminute the coarse sugar crystals into seed crystals, a portion of thick juice can be added to the shear field of the rotor-stator machine, which portion is branched off before crystallization. This addition can also be carried out in a closed system, so that no foreign substances have to be added to the crystallization process from the outside.
  • the withdrawn part of the filling compound is advantageously introduced into the shear field of a homogenizing machine.
  • a homogenizing machine is shown in DE-OS 30 32 783. It consists of a housing with a frusto-conical rotor encircling it, the outer surface of which is equipped with coaxial rings of staggered diameter, each of which is in a gap with similar rings on the housing wall opposite the rotor.
  • the coarse crystals of the filling compound are mixed with the thick juice within the shear field of the homogenizer in turbulence and comminuted.
  • An evaporator 1 is supplied with a thick juice coming from the precursor (not shown) for crystallization of sucrose via a line 2.
  • the crystallized filling compound is drawn off by means of a line 3. Seed crystals are required for crystal formation.
  • part of the filling compound is drawn off from line 3 by means of line 4 and added to a rotor-stator machine 5.
  • the coarse crystals of the filling compound are crushed into seed crystals, which are added to the evaporator 1 by means of the line 6.
  • a portion of thick juice is added to the rotor-stator machine 5 via a line 7.
  • part of the thin juice is added to the seed crystals via line 8 in order to dissolve the fine grain present.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Non-Alcoholic Beverages (AREA)
  • Saccharide Compounds (AREA)

Abstract

The invention relates to a process for grain formation in the crystallisation of a concentrated sugar solution to a massecuite by addition of seed sugar which is formed from the crystallised massecuite. For this purpose, a portion of the crystallised massecuite is comminuted and added as seed to the crystallisation in-line in a closed system.

Description

Die Erfindung betrifft ein Verfahren zur Kornbildung bei der Kristallisiation eines Zuckerdicksaftes zu einer Füllmasse durch Zugabe von Impfzucker eines zerkleinerten feinen Zuckers.The invention relates to a process for grain formation in the crystallization of a thick sugar juice into a filling mass by adding inoculated sugar of a comminuted fine sugar.

Bei der Kristallisation werden Klären, Dicksäfte sowie Abläufe der nachfolgenden Abbaustufen verkocht. Nach dem Einziehen der zu verkochenden Saccharoselösungen in den Kochapparat wird bis zu einer für die Kornbildung erforderlichen Übersättigung eingedickt. Die Kornbildung wird durch Impfen des Zuckersaftes am jeweils günstigsten Übersättigungspunktes eingeleitet.During the crystallization process, clarifications, thick juices and the processes of the subsequent degradation stages are boiled. After the sucrose solutions to be boiled have been drawn into the cooking apparatus, the mixture is thickened to an oversaturation required for grain formation. Grain formation is initiated by inoculating the sugar juice at the most favorable oversaturation point.

Die Impfung des Zuckersaftes kann durch plötzliches Einziehen von Luft erfolgen, wobei die Impfkristallbildung durch einen Schock bewirkt wird. Mit dieser Verfahrensweise werden Mischkristalle gebildet, die zu einem unterschiedlichen Kornsspektrum innerhalb der Füllmasse führt.The vaccination of the sugar juice can be done by suddenly drawing in air, whereby the formation of the seed crystal is caused by a shock. With this procedure, mixed crystals are formed, which leads to a different grain spectrum within the filling compound.

Auch ist es bekannt, die Impfkristalle durch Zugabe von in Isopropylalkohol suspendiertem Puderzucker herzustellen. Hierbei handelt es sich um einen Impfzucker, der in Spezialmühlen zu äußerst feinem Zucker von etwa 4 my naß zerkleinert wird. Diese Kristalle werden in einem wässrigen System auf etwa 30 my gekocht und danach der Kristallisation als Impfzucker zugegeben. Abgesehen von der sehr aufwendigen externen Herstellungsweise, erfordert die organische, feuergefährliche Hilfsflüssigkeit gesonderte Exschutzbedingungen.It is also known to produce the seed crystals by adding powdered sugar suspended in isopropyl alcohol. This is an inoculated sugar that is crushed in special mills to extremely fine sugar of about 4 my wet. These crystals are boiled in an aqueous system to about 30 microns and then added to the crystallization as seed sugar. Apart from the very complex external production method, the organic, flammable auxiliary liquid requires special explosion protection conditions.

Der Erfindung liegt die Aufgabe zugrunde für die Kornbildung ein einfaches Verfahren zu schaffen, mit dem ein Impfzucker mit einer gleichmäßigen Korngröße geschaffen wird.The invention has for its object to provide a simple method for grain formation, with which a seed sugar is created with a uniform grain size.

Diese Aufgabe wird dadurch gelöst, daß aus der kristallisierten Füllmasse ein Teil abgezogen, zerkleinert und als Impfzucker in einem geschlossenen System Inline in die Kristallisation zurückgeführt wird.This object is achieved in that a part is withdrawn from the crystallized filling compound, crushed and returned to the crystallization as inoculated sugar in a closed system inline.

Nach der Kristallisation von Saccharose liegen größere Kristalle in einem natürlichen wässrigen System, der Füllmasse, vor. Der aus der Füllmasse abgezweigte Teil wird innerhalb eines Bypasses zerkleinert und zurückgeführt, so daß die gewünschte, einfache Verfahrensweise geschaffen ist.After the crystallization of sucrose, larger crystals are present in a natural aqueous system, the filling compound. The part branched off from the filling compound is comminuted and returned within a bypass, so that the desired, simple procedure is created.

Mittels einer im Bypass-System vorgesehenen Rotor-Stator-Maschine kann in deren Scherfeld ein gleichmäßiges Impfkorn von ca. 30 my hergestellt werden.Using a rotor-stator machine provided in the bypass system, a uniform seed grain of approx. 30 my can be produced in its shear field.

Auch in einer Rotor-Stator-Maschine läßt sich der Anfall von Feinkorn nicht vermeiden. Um das Feinkorn auszuschließen, wird den Impfkristallen vor der Zuführung in die Kristallisation ein Anteil Dünnsaft zugeführt. Dieser ist in der Lage das Feinkorn aufzulösen, ohne das Grobkorn wesentlich anzulösen. Damit ist sichergestellt, daß der Kristallisation ein Impfzucker mit gleichmäßigem Kornanteil zugeführt wird.The occurrence of fine grain cannot be avoided even in a rotor-stator machine. In order to exclude the fine grain, a portion of thin juice is added to the seed crystals before being fed into the crystallization. This is able to dissolve the fine grain without significantly dissolving the coarse grain. This ensures that a seed sugar with an even grain content is added to the crystallization.

Die aus der Kristallisation abgezogene Füllmasse bildet ein natürliches wässriges System. Sollte der Flüssigkeitsanteil für eine Zerkleinerung der groben Zuckerkristalle zu Impfkristallen nicht ausreichen, so kann dem Scherfeld der Rotor-Stator-Maschine ein Anteil Dicksaft zugeführt werden, der vor der Kristallisation abgezweigt wird. Auch diese Zugabe kann in einem geschlossenen System durchgeführt werden, so daß dem Kristallisationsprozeß keine Fremdstoffe von außen zugeführt werden müssen.The filling compound drawn off from the crystallization forms a natural aqueous system. If the liquid portion is not sufficient to comminute the coarse sugar crystals into seed crystals, a portion of thick juice can be added to the shear field of the rotor-stator machine, which portion is branched off before crystallization. This addition can also be carried out in a closed system, so that no foreign substances have to be added to the crystallization process from the outside.

In vorteilhafter Weise wird der abgezogene Teil der Füllmasse in das Scherfeld einer Homogenisiermaschine eingeführt. Eine derartige Maschine ist in der DE-OS 30 32 783 dargestellt. Sie besteht aus einem Gehäuse mit darin umlaufendem kegelstumpfförmigen Rotor, dessen Mantelfläche mit koaxialen Ringen gestaffelten Durchmessers ausgestattet ist, die jeweils auf Lücke stehen mit gleichartigen Ringen an der dem Rotor gegenüberliegenden Gehäusewand. Die groben Kristalle der Füllmasse werden innerhalb des Scherfeldes des Homogenisierers in Turbulenz mit dem Dicksaft vermischt und zerkleinert.The withdrawn part of the filling compound is advantageously introduced into the shear field of a homogenizing machine. Such a machine is shown in DE-OS 30 32 783. It consists of a housing with a frusto-conical rotor encircling it, the outer surface of which is equipped with coaxial rings of staggered diameter, each of which is in a gap with similar rings on the housing wall opposite the rotor. The coarse crystals of the filling compound are mixed with the thick juice within the shear field of the homogenizer in turbulence and comminuted.

Eine Vorrichtung zur Durchführung des Verfahrens ist in der Zeichnung dargestellt und wird nachfolgend an einem Ausführungsbeispiel näher beschrieben.An apparatus for performing the method is shown in the drawing and is described in more detail below using an exemplary embodiment.

Einem Verdampfer 1 wird zur Kristallisation von Saccharose über eine Leitung 2 ein aus der nicht dargestellten Vorstufe kommender Dicksaft zugeführt. Die kristallisierte Füllmasse wird mittels einer Leitung 3 abgezogen. Für die Kristallbildung verden Impfkristalle benötigt. Zur Bildung der Impfkristalle wird aus der Leitung 3 mittels einer Leitung 4 ein Teil Füllmasse abgezogen und einer Rotor-Stator-Maschine 5 zugegeben. Hier verden die groben Kristalle der Füllmasse zu Impfkristallen zerkleinert, die mittels der Leitung 6 dem Verdampfer 1 zugegeben werden. Zur Verbesserung der Zerkleinerungsarbeit wird der Rotor-Stator-Maschine 5 über eine Leitung 7 ein Teil Dicksaft zugegeben. Fernerhin wird den Impfkristallen über Leitung 8 ein Teil Dünnsaft zugegeben, um vorhandenes Feinkorn aufzulösen.An evaporator 1 is supplied with a thick juice coming from the precursor (not shown) for crystallization of sucrose via a line 2. The crystallized filling compound is drawn off by means of a line 3. Seed crystals are required for crystal formation. To form the seed crystals, part of the filling compound is drawn off from line 3 by means of line 4 and added to a rotor-stator machine 5. Here the coarse crystals of the filling compound are crushed into seed crystals, which are added to the evaporator 1 by means of the line 6. To improve the shredding work, a portion of thick juice is added to the rotor-stator machine 5 via a line 7. Furthermore, part of the thin juice is added to the seed crystals via line 8 in order to dissolve the fine grain present.

Claims (9)

1. Verfahren zur Kornbildung bei der Kristallisation eines Zuckerdicksaftes zu einer Füllmasse durch Zugabe von Impfzucker eines zerkleinerten feinen Zuckers, dadurch gekennzeichnet, daß aus der kristallisierten Füllmasse ein Teil abgezogen, zerkleinert und als Impfzucker in einem geschlossenen System Inline in die Kristallisation zurückgeführt wird.1. A process for grain formation in the crystallization of a thick sugar juice into a filling mass by adding inoculated sugar of a comminuted fine sugar, characterized in that a part is withdrawn from the crystallized filling mass, comminuted and returned as inoculation sugar inline in a closed system in the crystallization. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Menge des abgezogenen Füllmasseteils weniger als 1 % der Gesamtfüllmenge beträgt.2. The method according to claim 1, characterized records that the amount of the filler part withdrawn is less than 1% of the total fill amount. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der abgezogene Teil der Füllmasse auf eine Kristallgröße zwischen 20 und 40 my, vorzugsweise 30 my zerkleinert wird.3. Process according to claims 1 and 2, characterized in that the withdrawn part of the filling compound is crushed to a crystal size between 20 and 40 my, preferably 30 my. 4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Zerkleinerung im Scherfeld einer Rotor-Stator-Maschine durchgeführt wird.4. The method according to claims 1 to 3, characterized in that the comminution is carried out in the shear field of a rotor-stator machine. 5. Verfahren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß dem zerkleinerten Füllmasseteil vor der Zuführung in die Kristallisation ein Anteil Dünnsaft aus dem Vorprozeß der Kristallisation in einer Menge zugegeben wird, die der Menge des Feinkornanteils angepaßt ist.5. Process according to claims 1 to 4, characterized in that a portion of thin juice from the pre-process of crystallization is added to the crushed filler part before being fed into the crystallization in an amount which is adapted to the amount of the fine-grain portion. 6. Verfahren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß dem abgezogenen Füllmasseteil innerhalb des Scherfeldes der Rotor-Stator-Maschine ein Anteil Dicksaft zugegeben wird.6. The method according to claims 1 to 5, characterized in that a portion of thick juice is added to the removed filler mass part within the shear field of the rotor-stator machine. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Menge des der Rotor-Stator-Maschine zugeführten Dicksaftes eine maximale Verdünnung des abgezogenen Füllmasseteiles von 1 : 1 bewirkt.7. The method according to claim 6, characterized in that the amount of the thick-juice fed to the rotor-stator machine causes a maximum dilution of the withdrawn filler part of 1: 1. 8. Verfahren nach Anspruch 1 bis 7, dadurch gekennzeichnet, daß der abgezogene Teil der Füllmasse in das Scherfeld einer Homogenisierungsmaschine eingeführt wird, die aus einem Gehäuse mit darin umlaufenden kegelstumpfförmigen Rotor besteht, dessen Mantelfläche mit koaxialen Ringen gestaffelten Durchmessers ausgestaltet ist, die jeweils auf Lücke stehen mit gleichartigen Ringen an der dem Rotor gegenüberliegenden Gehäusewand, wobei die groben Kristalle der Füllmasse innerhalb des Scherfeldes in Turbulenz mit dem Dicksaft vermischt und zerkleinert werden.8. The method according to claim 1 to 7, characterized in that the withdrawn part of the filling compound is introduced into the shear field of a homogenizing machine, which consists of a housing with a frusto-conical rotor rotating therein, the outer surface of which is designed with coaxial rings of staggered diameter, each on There are gaps with similar rings on the housing wall opposite the rotor, whereby the coarse crystals of the filling compound are mixed with the thick juice within the shear field in turbulence and comminuted. 9. Verfahren nach den Ansprüch 6 und 7, dadurch gekennzeichnet, daß der Anteil an Dicksaft vor der Kristallisation abgezweigt wird.9. The method according to claims 6 and 7, characterized in that the proportion of thick juice is branched off before crystallization.
EP91113250A 1990-09-05 1991-08-07 Process for graining by the cristallization of a thick juice Withdrawn EP0473956A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4028071 1990-09-05
DE19904028071 DE4028071A1 (en) 1990-09-05 1990-09-05 METHOD FOR GRAINING IN THE CRYSTALIZATION OF A SUGAR FILLED JUICE

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EP0473956A1 true EP0473956A1 (en) 1992-03-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000056939A1 (en) * 1999-03-24 2000-09-28 Nordzucker Ag Saccharose crystallization method using a sugar powder suspension as starting crystals
WO2003090786A1 (en) * 2002-04-23 2003-11-06 Schering Aktiengesellschaft Method for producing crystals from pharmaceutical adjuvants, crystals obtained therefrom and the pharmaceutical use thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2109397A5 (en) * 1970-10-15 1972-05-26 Fives Lille Cail Sugar crystals continuous prodn - from sugar juices by vacuum evaporation
FR2357284A1 (en) * 1976-07-10 1978-02-03 Buckau Wolf Maschf R Continuous vacuum vapouriser crystalliser esp. for sugar solns. - force feeds concentrate across screen recycling material falling through
EP0104277A1 (en) * 1982-09-23 1984-04-04 Csm Suiker B.V. Preparation of seeding crystals for massecuite
EP0128078A1 (en) * 1983-05-26 1984-12-12 FIVES-CAIL BABCOCK, Société anonyme Process and apparatus for continuously producing sugar crystals from sugar juices
DE3545624A1 (en) * 1985-12-21 1987-06-25 Krupp Gmbh VACUUM EVAPORATION CRYSTALIZATION METHOD

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374067A1 (en) * 1976-12-14 1978-07-13 Fives Cail Babcock PROCESS AND PLANT FOR THE PRODUCTION OF SELECTED CRYSTALLIZING GERM, APPLICABLE TO DISCONTINUOUS OR CONTINUOUS CRYSTALLIZING APPARATUS, PARTICULARLY FOR LOW SWEET PRODUCTS

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2109397A5 (en) * 1970-10-15 1972-05-26 Fives Lille Cail Sugar crystals continuous prodn - from sugar juices by vacuum evaporation
FR2357284A1 (en) * 1976-07-10 1978-02-03 Buckau Wolf Maschf R Continuous vacuum vapouriser crystalliser esp. for sugar solns. - force feeds concentrate across screen recycling material falling through
EP0104277A1 (en) * 1982-09-23 1984-04-04 Csm Suiker B.V. Preparation of seeding crystals for massecuite
EP0128078A1 (en) * 1983-05-26 1984-12-12 FIVES-CAIL BABCOCK, Société anonyme Process and apparatus for continuously producing sugar crystals from sugar juices
DE3545624A1 (en) * 1985-12-21 1987-06-25 Krupp Gmbh VACUUM EVAPORATION CRYSTALIZATION METHOD

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000056939A1 (en) * 1999-03-24 2000-09-28 Nordzucker Ag Saccharose crystallization method using a sugar powder suspension as starting crystals
WO2003090786A1 (en) * 2002-04-23 2003-11-06 Schering Aktiengesellschaft Method for producing crystals from pharmaceutical adjuvants, crystals obtained therefrom and the pharmaceutical use thereof

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