EP0104277A1 - Préparation de cristaux d'ensemencement pour masse cuite - Google Patents

Préparation de cristaux d'ensemencement pour masse cuite Download PDF

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Publication number
EP0104277A1
EP0104277A1 EP82201191A EP82201191A EP0104277A1 EP 0104277 A1 EP0104277 A1 EP 0104277A1 EP 82201191 A EP82201191 A EP 82201191A EP 82201191 A EP82201191 A EP 82201191A EP 0104277 A1 EP0104277 A1 EP 0104277A1
Authority
EP
European Patent Office
Prior art keywords
sugar
crystals
pressure
suspension
size
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.)
Granted
Application number
EP82201191A
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German (de)
English (en)
Other versions
EP0104277B1 (fr
Inventor
Pieter Willem Van Der Poel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CSM Suiker BV
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CSM Suiker BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CSM Suiker BV filed Critical CSM Suiker BV
Priority to EP82201191A priority Critical patent/EP0104277B1/fr
Priority to AT82201191T priority patent/ATE18778T1/de
Priority to DE8282201191T priority patent/DE3270132D1/de
Priority to US06/531,926 priority patent/US4518436A/en
Priority to CA000437201A priority patent/CA1204438A/fr
Priority to JP58174434A priority patent/JPS59175900A/ja
Publication of EP0104277A1 publication Critical patent/EP0104277A1/fr
Application granted granted Critical
Publication of EP0104277B1 publication Critical patent/EP0104277B1/fr
Expired legal-status Critical Current

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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 the production of seed crystals for sugar south by adding a highly concentrated sugar solution with granulated sugar, ground sugar or a sugar suspension.
  • the vacuum is kept as constant as possible.
  • inoculation in such a method is carried out in a crystallization vessel (cooking pan) with an internal heating element (steam box) and a total volume of 20-60 m 3 with a volume, the steam box being flooded with supersaturated solution.
  • the volume mentioned is about 30X the final volume of the crystal mass in the pan.
  • the inoculation is carried out by adding a quantity of granulated sugar, powdered sugar, ground sugar or sugar suspension to the supersaturated solution.
  • the seed crystals initiate nucleation, the formation of the final number of germs being determined by the duration of the process and the supersaturation number of the solution in which further vaccination is carried out.
  • the nucleation is stopped. This interruption takes place by reducing the supersaturation number. This reduction can be achieved by drawing in a quantity of unsaturated sugar solution, drawing in a quantity of water or increasing the temperature (it is referred to as drawing in because the negative pressure prevailing when a valve is opened from a container under normal pressure produces a quantity of sugar solution, water and the like is drawn into the crystallizer).
  • a further disadvantage of this known method is that large quantities of water, which are to be evaporated again later, usually have to be drawn in to break off the nucleation and accordingly increase the energy expenditure.
  • seed crystals of a much more regular distribution of grain size can be obtained by having a volume of 1.8-2.2% of the final volume of a supersaturation number of 1.12-1.20 with a suspension of ground sugar with a grain size of 5-20 ⁇ m and that the seed crystal is produced in a vessel without a heating element, the mixing being carried out by means of a circulation pump and the crystallization being carried out thereby that the pressure in the crystallization device is adjusted in such a way that liquid evaporates and the temperature is reduced, the pressure reduction and / or the temperature being adjusted such that the oversaturation number remains within the limits of 1.12-1.20.
  • the supersaturation number drops.
  • the latter is controlled by the pressure in the crystallization device in such a way that the temperature of the solution is regulated by means of water evaporation.
  • the water evaporation itself is regulated by means of the pressure across the liquid. It is important that, in contrast to normal practice, no heat is added at this stage of the process.
  • the volume used in this procedure - for vaccination is less than the usual volume.
  • the temperature is reduced by 0.4-1.0 ° C per minute, in particular 0.6 ° C per minute. Particularly good crystals are obtained here.
  • the inoculation can be carried out here with a suspension of ground sugar in isopropanol, advantageously with a concentration of 25-50% by volume of sugar, in particular 31-35% by volume of sugar, preferably 33% by volume of sugar.
  • the grain size of the ground sugar in this suspension is, for example, 5-20 pm, in particular 8-12 pm.
  • the crystallization is then carried out in such a way that the supersaturation is set by cooling. This cooling is achieved by allowing liquid to evaporate, the evaporation being controlled by the pressure in the crystallization vessel.
  • the temperature of the cooking mass is used in this method moderately brought to 75-100 ° C, especially to 82-87 ° C and sometimes to 85 ° C.
  • the supersaturation number is determined on the basis of the viscosity of the sugar solution; such a viscosity amounts to several hundreds of mPa.s.
  • the suspension is added and the cooking mass is cooled from 85 ° C. to 75 ° C. As has already been mentioned, this cooling takes place by means of evaporation of the liquid. Such evaporation expediently takes place within a period of 10 to 30, in particular 17 to 25 minutes.
  • the pressure is expediently 60 to 80 centibars.
  • the negative pressure is set by the pressure regulation in the top of the pan, so the temperature is then determined by water evaporation.
  • the regulation of the negative pressure is effected with the aid of a computer program, so that the crystallization is optimal and secondary nucleation is prevented as much as possible.
  • the water vapor obtained is removed by drawing off in order to maintain the negative pressure.
  • the crystallization can be continued by adding heat by means of steam.
  • the method according to the invention differs from the known in that the entire process can be automated well, a small inoculation volume of, for example, 1 m 3 can be used, and the solution with crystals up to 100 .mu.m by means of a circulation pump is mixed, the number of crystals is only determined by the amount of suspension and the number of crystals can be better regulated, the supersaturation number is regulated by cooling instead of vaporization by steam until a crystal size of 100 ⁇ m is reached, the number of conglomerates is suppressed to a minimum , the small crystal nuclei dissolve in the undersaturated solution after the heat exchanger during the boil-up, the under-saturation of the solution by means of a) adjusting the temperature difference via the heat exchanger and b) the place of drawing in the mixed juice either in the circulation line or in the pan can be regulated.
  • the dwell time in the undersaturated zone is regulated by a circulation pump and is generally 5-25 seconds.
  • the horizontal mixing can be regulated by means of a rudder unit, but the vertical mixing is achieved by means of a circulation pump. If a Ruhrwerk is used in the vessel, its construction is such that the mixing takes place in layers.
  • a suitable device for carrying out the method according to the application is shown in the attached figure, in which 1 is the container in which the seed crystals are produced, 2 is a stirrer of such a type that it causes a layer-by-layer mixing, 3 is a line for evacuating, which is greatly reduced Pressure can be applied and which is equipped with a valve 4, 5 is a pressure measuring element and 6 is a temperature measuring element. 4 and 5 as well as 6 are connected to an organ 7 which ensures that a predetermined program is carried out. Furthermore, the container is equipped with a filling height meter 8 and a viscosity meter 9. The organs 8 and 9 are again connected to an organ 10 for data processing, which organ 10 can be combined with the organ 7.
  • a supply (11) provided with a valve 12 which is connected to a water supply 13, an A syrup supply 14 and a mixed juice supply 15 which are provided with valves 16, 17 and 18, respectively are again connected to the control element 10.
  • the supply lines 13, 14 and 15 are also connected via a valve 19 the discharge line 20 arranged at the bottom of the vessel.
  • the discharge line 20 is provided with a pump 21 for pumping up the liquid, while a heat exchanger 22 is furthermore arranged in this line, which is expediently of a plate heat exchanger type.
  • This plate heat exchanger is heated via a steam line 23 provided with a valve 24.
  • the valve 24 is controlled by the control element 25, which can again be combined with the elements 7 and 10.
  • the product passed through the heat exchanger 22 is returned to the container via line 26, in which a temperature measuring element 27 connected to the control element 25 is arranged.
  • This line is also equipped with a resistor 28 of 0.2 bar.
  • a discharge line 29 is connected to the vessel, which is provided with a valve 30 and which serves to enable the suspension obtained to be removed from the vessel.
  • the improved crystal quality in the process according to the invention brings about a reduction in the amount of mother liquor enclosed. An improvement in the quality of the end product is thereby achieved and the energy consumption is reduced, while less crystallization is required due to the improved crystal quality.
  • the reduced ash content and the smaller number of conglomerates indicate the improved crystal quality.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Saccharide Compounds (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
EP82201191A 1982-09-23 1982-09-23 Préparation de cristaux d'ensemencement pour masse cuite Expired EP0104277B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP82201191A EP0104277B1 (fr) 1982-09-23 1982-09-23 Préparation de cristaux d'ensemencement pour masse cuite
AT82201191T ATE18778T1 (de) 1982-09-23 1982-09-23 Verfahren zur erzeugung von impfkristallen fuer zuckersude.
DE8282201191T DE3270132D1 (en) 1982-09-23 1982-09-23 Preparation of seeding crystals for massecuite
US06/531,926 US4518436A (en) 1982-09-23 1983-09-13 Process for the production of graft crystals for use in seeding sugar boiling brines
CA000437201A CA1204438A (fr) 1982-09-23 1983-09-21 Procede de production de sucre cristallise et particulierement de cristaux germes utilises dans les sirops de raffinerie
JP58174434A JPS59175900A (ja) 1982-09-23 1983-09-22 煎糖懸濁液の粗粒結晶の製造法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82201191A EP0104277B1 (fr) 1982-09-23 1982-09-23 Préparation de cristaux d'ensemencement pour masse cuite

Publications (2)

Publication Number Publication Date
EP0104277A1 true EP0104277A1 (fr) 1984-04-04
EP0104277B1 EP0104277B1 (fr) 1986-03-26

Family

ID=8189517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201191A Expired EP0104277B1 (fr) 1982-09-23 1982-09-23 Préparation de cristaux d'ensemencement pour masse cuite

Country Status (6)

Country Link
US (1) US4518436A (fr)
EP (1) EP0104277B1 (fr)
JP (1) JPS59175900A (fr)
AT (1) ATE18778T1 (fr)
CA (1) CA1204438A (fr)
DE (1) DE3270132D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0473956A1 (fr) * 1990-09-05 1992-03-11 Dorr-Oliver Deutschland GmbH Procédé de grainage lors de la cristallisation d'un jus dense
WO2000056939A1 (fr) * 1999-03-24 2000-09-28 Nordzucker Ag Procede pour la cristallisation de saccharose avec utilisation d'une suspension de poudre de sucre comme matiere cristalline de depart

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI77693C (fi) * 1987-06-03 1989-04-10 Suomen Sokeri Oy Foerfarande foer kristallisering av fruktos.
FI96225C (fi) * 1993-01-26 1996-05-27 Cultor Oy Menetelmä melassin fraktioimiseksi
US6663780B2 (en) 1993-01-26 2003-12-16 Danisco Finland Oy Method for the fractionation of molasses
US5795398A (en) 1994-09-30 1998-08-18 Cultor Ltd. Fractionation method of sucrose-containing solutions
US6224776B1 (en) 1996-05-24 2001-05-01 Cultor Corporation Method for fractionating a solution
FI20010977A7 (fi) 2001-05-09 2002-11-10 Danisco Sweeteners Oy Kromatografinen erotusmenetelmä
US9309576B2 (en) * 2013-03-13 2016-04-12 Rockwell Automation Technologies, Inc. Sugar crystallization control system and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH418260A (fr) * 1963-01-11 1966-07-31 Bizet Andre Pierre Osmond Procédé de cristallisation du sucre
BE709700A (fr) * 1968-01-22 1968-05-30
FR2073064A5 (fr) * 1969-12-12 1971-09-24 Stamicarbon

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3503803A (en) * 1968-03-22 1970-03-31 Whiting Corp Continuous production of crystalline sucrose
US3617382A (en) * 1968-07-17 1971-11-02 Christos B Natsis Mixing apparatus as used in mass and heat transfer processes
FR1597729A (fr) * 1968-12-06 1970-06-29
US4004886A (en) * 1969-12-12 1977-01-25 Stamicarbon B.V. Two stage continuous process and apparatus for crystallization
US3695932A (en) * 1970-07-29 1972-10-03 Battelle Development Corp Sucrose nucleation composition and method of preparation
DK226976A (da) * 1976-05-21 1977-11-22 Danske Sukkerfab Fremgangsmade og apparat til podning af overmettede sukkeroplosninger til krystallisation
FR2374067A1 (fr) * 1976-12-14 1978-07-13 Fives Cail Babcock Procede et installation de production de germes de cristallisation selectionnes, applicables aux appareils cristalliseurs discontinus ou continus, particulierement pour bas produit de sucrerie
JPS5821390Y2 (ja) * 1978-10-27 1983-05-06 泉工医科工業株式会社 液体収容袋
JPS5933836Y2 (ja) * 1979-09-20 1984-09-20 丸山工業株式会社 冷媒チヤ−ジバルブ
JPS57117372U (fr) * 1981-01-14 1982-07-21
JPS5829999U (ja) * 1981-08-19 1983-02-26 株式会社島津製作所 液体送出容器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH418260A (fr) * 1963-01-11 1966-07-31 Bizet Andre Pierre Osmond Procédé de cristallisation du sucre
BE709700A (fr) * 1968-01-22 1968-05-30
FR2073064A5 (fr) * 1969-12-12 1971-09-24 Stamicarbon

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
INTERNATIONAL SUGAR JOURNAL, Band 79, Nr. 937, Januar 1977, Seiten 10-14 *
R.A. McGINNIS: "Beet-sugar technology", 1951, Seiten 404-410, Reinhold Publishing Corporation, New York, USA *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0473956A1 (fr) * 1990-09-05 1992-03-11 Dorr-Oliver Deutschland GmbH Procédé de grainage lors de la cristallisation d'un jus dense
WO2000056939A1 (fr) * 1999-03-24 2000-09-28 Nordzucker Ag Procede pour la cristallisation de saccharose avec utilisation d'une suspension de poudre de sucre comme matiere cristalline de depart

Also Published As

Publication number Publication date
EP0104277B1 (fr) 1986-03-26
US4518436A (en) 1985-05-21
DE3270132D1 (en) 1986-04-30
ATE18778T1 (de) 1986-04-15
JPS59175900A (ja) 1984-10-04
CA1204438A (fr) 1986-05-13
JPS6257320B2 (fr) 1987-11-30

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