EP0104277B1 - 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
EP0104277B1
EP0104277B1 EP82201191A EP82201191A EP0104277B1 EP 0104277 B1 EP0104277 B1 EP 0104277B1 EP 82201191 A EP82201191 A EP 82201191A EP 82201191 A EP82201191 A EP 82201191A EP 0104277 B1 EP0104277 B1 EP 0104277B1
Authority
EP
European Patent Office
Prior art keywords
sugar
crystals
size
suspension
pressure
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
Application number
EP82201191A
Other languages
German (de)
English (en)
Other versions
EP0104277A1 (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
Original Assignee
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 AT82201191T priority Critical patent/ATE18778T1/de
Priority to DE8282201191T priority patent/DE3270132D1/de
Priority to EP82201191A priority patent/EP0104277B1/fr
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 infusion by adding a suspension containing a highly concentrated sugar solution to a ground sugar.
  • the vacuum is kept as constant as possible to eliminate temperature fluctuations.
  • inoculation is carried out in such a method in a crystallization vessel (cooking pan) with an internal heating element (steam box) and a total volume of 20-60 m 3 at a cooking fill level in which the steam box is flooded with supersaturated solution.
  • the mentioned parboiling level is about 30% of the final volume of the crystal mass in the pan.
  • the vaccination is carried out by adding the supersaturated solution of granulated sugar, powdered sugar, ground sugar or sugar suspension.
  • the seed crystals initiate nucleation, the formation of the final number of germs being determined by the length of time of the process and the supersaturation number of the solution in which further vaccination is carried out.
  • nucleation is stopped. This interruption occurs by reducing the supersaturation number. This reduction can be achieved by drawing in unsaturated sugar solution, drawing in water or raising 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 draws a lot of sugar solution, water and the like into the crystallization vessel ).
  • the result obtained depends on the design of the cooking pan and the experience of the operating personnel. Sometimes irregular crystals with a large number of conglomerates with a very wide particle size distribution are obtained. The latter aspects are unfavorable for the quality of the end product because the removal of the mother liquor, which is usually carried out by centrifuging, is hindered thereby.
  • seed crystals of a much more regular distribution of the grain size can be obtained by adding a suspension at a parboiling level of 1.8-2.2% based on the brew content and a supersaturation number of 1.12 to 1.20 , which contains the sugar in a grain size of 5-20 pm, homogenizes the filling mass by means of an external circulation pump and crystallizes it, whereby liquid is evaporated and the temperature is reduced by adjusting the pressure, with the proviso that the oversaturation number is within the limit remains from 1.12 to 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 method of 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 oversaturation number of the sugar solution is set precisely, for example to a value of 1.16.
  • the inoculation can be carried out here with a suspension of ground sugar in isopropanol, suitably 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 5-20 ⁇ m, especially 8-12 p.m.
  • the crystallization is then carried out in such a way that the supersaturation is adjusted 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 expediently brought to 75-100 ° C, in particular 82-87 ° C and sometimes to 85 ° C.
  • the supersaturation number is determined based on 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 to 85 ° C to 75 ° C.
  • this cooling takes place by means of evaporation of the liquid.
  • 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 cooking pan, according to which the temperature is determined by water evaporation.
  • the regulation of the negative pressure is effected with the aid of a computer program, whereby the crystallization is optimal and secondary nucleation is prevented as far as possible.
  • the water vapor obtained is removed by drawing off in order to maintain the negative pressure.
  • the crystallization can be continued by applying heat with steam.
  • an inoculum material is obtained, the grain size of which is approximately 200 ⁇ m, because, as already mentioned, the grain size scatter is relatively small.
  • the construction of the device is such that an unsaturated solution is formed in the heat exchanger due to the heating and the circulation. By regulating the dwell time in the unsaturated zone and the degree of unsaturation, the secondary nucleation is eliminated by the fine crystals dissolving again.
  • the method according to the invention differs from the known one in that the entire process can be automated well, a small inoculation volume of, for example, 1 m 3 can be used, the solution is mixed with crystals up to 100 ⁇ m by means of a circulation pump, the number of crystals only by the amount of suspension is determined 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 are concentrated during the boiling Dissolve the undersaturated solution after the heat exchanger, whereby the undersaturation of the solution can be regulated by a) adjusting the temperature difference via the heat exchanger and b) by means of the point at which the mixed juice is drawn into either the circulation line or the pan.
  • 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 an agitator, but the vertical mixing is achieved by means of a circulation pump. If an agitator is used in the vessel, its design 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, where 1 is the container in which the seed crystals are produced, 2 is a stirrer of a type which enables layer-by-layer mixing, 3 is a line for evacuation to which an greatly reduced pressure can be applied and which is equipped with a valve 4, 5 are a pressure measuring element and 6 are 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 bodies 8 and 9 are also connected to a member 10 for data processing, wherein the organ may be combined with the 1 0 organ. 7
  • a valved 12 supply (11) is further arranged which is connected to a water supply 13, an A syrup supply 14 and a mixed juice supply 1 5, which are provided with valves 16, 17 and 18, respectively, are themselves of are again connected to the control element 10.
  • the supply lines 13, 14 and 15 are also connected via a valve 19 to the discharge line 20 arranged at the bottom of the vessel.
  • the discharge line 20 is provided with a pump 21 for pumping off the liquid, a heat exchanger 22 which is expediently also a plate heat exchanger being arranged in this line.
  • 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 be combined again 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 discharge the suspension obtained from the vessel.
  • the improved crystal quality in the process according to the invention results in a reduction in the amount of mother liquor enclosed. An improvement in the quality of the end product is thereby achieved and the energy expenditure is reduced, less crystallization being required due to the improved crystal quality.
  • the reduced ash content and the smaller number of conglomerates indicate the improved crystal quality.

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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)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (2)

1. Procédé pour la préparation de cristaux d'ensemencement pour masse cuite de sucre par mélange d'une solution sucrée très concentrée et d'une suspension de sucre moulu, caractérisé en ce qu'à une hauteur de remplissage de la solution à cuire est initialement comprise entre 1,8 et 2,2 % par rapport au contenu final en masse cuite et à un degré de sursaturation compris entre 1,12 et 1,20, on ajoute une suspension contenant le sucre dont la taille des grains est comprise entre 5 et 20 p.m, en ce que la masse de remplissage est homogénéisée au moyen d'une pompe extérieure de circulation, de sorte que le liquide est évaporé par ajustement de la pression et la température est abaissée, avec la mesure que le degré de sursaturation est maintenu entre les limites de 1,12 à 1,20.
2. Procédé conforme à la revendication 1, caractérisé en ce que, dès que les cristaux d'ensemencement ont atteint par refroidissement une dimension de 100 µm, on amène de la vapeur à un échangeur de chaleur extérieur à l'appareil de cristallisation pour provoquer l'évaporation ultérieure et dissoudre les cristaux secondaires.
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
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
EP82201191A EP0104277B1 (fr) 1982-09-23 1982-09-23 Préparation de cristaux d'ensemencement pour masse cuite
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 EP0104277A1 (fr) 1984-04-04
EP0104277B1 true 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)

Families Citing this family (9)

* 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.
DE4028071A1 (de) * 1990-09-05 1992-03-12 Krupp Buckau Maschinenbau Gmbh Verfahren zur kornbildung bei der kristallisation eines zuckerdicksaftes
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
DE19913587A1 (de) * 1999-03-24 2000-09-28 Nordzucker Ag Verfahren für die Saccharosekristallisation unter Verwendung einer Zuckerstaubsuspension als Vorlagekristallisat
FI20010977A (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

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1368118A (fr) * 1963-01-11 1964-07-31 Perfectionnements à la cristallisation du sucre
BE709700A (fr) * 1968-01-22 1968-05-30
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
IL35793A (en) * 1969-12-12 1973-10-25 Stamicarbon Continuous process for crystallization
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

Also Published As

Publication number Publication date
CA1204438A (fr) 1986-05-13
DE3270132D1 (en) 1986-04-30
JPS59175900A (ja) 1984-10-04
EP0104277A1 (fr) 1984-04-04
JPS6257320B2 (fr) 1987-11-30
US4518436A (en) 1985-05-21
ATE18778T1 (de) 1986-04-15

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