EP3105356A1 - Procédé et installation de production de cristaux de lactose - Google Patents

Procédé et installation de production de cristaux de lactose

Info

Publication number
EP3105356A1
EP3105356A1 EP15705553.4A EP15705553A EP3105356A1 EP 3105356 A1 EP3105356 A1 EP 3105356A1 EP 15705553 A EP15705553 A EP 15705553A EP 3105356 A1 EP3105356 A1 EP 3105356A1
Authority
EP
European Patent Office
Prior art keywords
solution
lactose
falling film
crystallization
suspension
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.)
Withdrawn
Application number
EP15705553.4A
Other languages
German (de)
English (en)
Inventor
Reinhard Scholz
Jan A.M.V. Van Esch
Christian Melches
Hermann Plate
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.)
GEA Messo GmbH
Original Assignee
GEA Messo GmbH
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 GEA Messo GmbH filed Critical GEA Messo GmbH
Publication of EP3105356A1 publication Critical patent/EP3105356A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
    • C13K5/00—Lactose

Definitions

  • the invention relates to a process for the continuous production of a lactose crystallizate from an aqueous lactose solution and to a plant for carrying it out.
  • Aqueous lactose solutions are obtained in milk processing, especially as a result of the treatment of whey, which has been extracted from proteins, for example by membrane filtration such as ultrafiltration.
  • Water content can be obtained from the solution, the lactose as a solid.
  • batch processes have conventionally been used.
  • an aqueous lactose solution is first replaced by a
  • Nanofiltration extracted about 98% of the contained proteins The then e.g. 1 to 3% of the TS (here and in the following always containing as dry matter by weight) lactose solution is then added e.g. withdrawn by reverse osmosis water, so that a content of about 5 - 8% TS results.
  • the thus preconcentrated solution is then heated to about 70 ° C with evaporation of water (for example in a falling film evaporator) and concentrated to 60-70% DM and then into a series of
  • Refrigerated containers filled and cooled to form lactose crystals are then each emptied into a centrifuge combination (e.g., decanter and screen screw centrifuge) to separate the lactose crystal formed from the mother liquor.
  • a centrifuge combination e.g., decanter and screen screw centrifuge
  • the publication WO 03/075643 A2 discloses a process for the continuous recovery of lactose crystallizate from an aqueous lactose solution which first preconcentration of the solution by evaporation of water to 45-65% solids content and then a high concentration to about 70-80%. Solid content provides. The highly concentrated solution is then in a
  • Crystallization are each formed as a horizontal cylindrical container whose volume is only partially filled with solution and through the longitudinal axis of a paddled, driven shaft runs, which promotes the solution under constant circulation in the next stage, the air for cooling above the Liquid level is passed through the container.
  • This method requires a comparatively complex system technology and a high energy consumption for operation.
  • Another method for obtaining lactose crystallizate is from
  • Heat exchanger in particular a riser or a thermosyphon heat exchanger, heated to 50 - 90 ° C and passed into an evaporation vessel in which water evaporates and lactose crystallized.
  • the heat exchanger is connected in a circuit with the evaporation tank, so that the solution circulates with the formed crystals as a suspension.
  • a partial stream of the suspension is discharged continuously and fed, for example, to a hydrocyclone, in which by separation of mother liquor which is recycled, a suspension with increased solids content is produced.
  • the suspension thus obtained is then placed in batch-wise operated cooling tanks in which the original grain size of the crystallizate formed in the evaporation vessel is further increased by further crystallization as a result of the cooling of the entrained solution fraction.
  • US Pat. No. 4,955,363 A discloses a process for obtaining lactose crystallizate from whey, which first undergoes a multistage falling film evaporation at a maximum temperature of 75 ° C. and is concentrated to, for example, 58% DM. The solution thus concentrated is then charged into a crystallization tank and cooled therein with stirring the solution over a period of several hours at a cooling rate of 2 ° C / h to 15 ° C, wherein lactose crystallizate precipitates out of the solution.
  • the crystallization tank is emptied via a decanter centrifuge, in which the lactose crystallizate is separated from the mother liquor.
  • the mother liquor is transferred to a buffer while the crystals are washed and dried after centrifugation.
  • the mother solution separated from the washed crystals in the centrifuge is also incorporated into the
  • Mother solution is heated to 60 - 70 ° C.
  • the precipitated solids are removed by centrifugation.
  • the mother liquor separated is subjected to a chromatographic fractionation yielding three fractions, namely a protein fraction to be removed, a middle fraction containing lactose and other impurities, which is recycled to chromatographic fractionation, and a lactose fraction entering the crystallization tank is returned.
  • the published patent application DE 198 39 209 A1 discloses a process for obtaining lactose crystallizate from whey, which after a protein removal by
  • Ultrafiltration to concentrate the whey uses a nanofiltration, wherein 80-90% of the solution in the permeate (water and salts) are transferred.
  • Lactose supersaturated retentate is placed in a crystallization tank in which a lactose crystallizate is formed by addition of seed crystals and optional cooling. The crystals are separated by decantation, then washed and dried. The mother liquor is at least partially recycled before nanofiltration.
  • the separated mother solution can also completely or partially a chromatographic
  • the object of the present invention is to improve a process for producing a lactose monohydrate crystallizate from a continuously fed aqueous lactose solution such that the production of the lactose crystallisate remains as constant as possible with energy as well as energetically and in terms of plant and plant technology low effort and the highest possible yield is guaranteed.
  • This object is achieved by a process for the continuous production of a lactose monohydrate crystallizate from a continuously fed aqueous lactose solution preconcentrated to about 5-8% TS, from which the original contained proteins by a membrane filtration largely (95 - 99% of the original content) were removed, so that at most slight residual amounts of protein are present.
  • the preconcentrated solution is under
  • the temperature of the solution is kept in the range of about 50-90 ° C. and the solution brought to a content of 60-80% of DM and the continuous cooling crystallization at 10 ° -55 ° C. with continuous circulation the
  • Cooling crystallization was withdrawn, recovered by solid / liquid separation. Of course, this is followed by the usual further treatment steps for the crystals, such as crystal washing and drying.
  • Essential for the increase in the yield is that part of the mother liquor separated from the product crystallization is recycled before the entrance of the falling film evaporation and only a remainder of the mother liquor is rejected. Typically, yields in the range of about 75-85% can thus be achieved.
  • the cooling crystallization is operated with a continuous vacuum cooling to the time and
  • Continuous vacuum cooling crystallization protects very well against the risk of contamination by bacteria because of the outward complete conclusion and therefore also allows a considerable saving in cleaning effort compared to a batch-wise crystallization. Added to this is the advantage that in the Vacuum generation from the cooling crystallizer water vapor is constantly withdrawn and thus after the falling film evaporation still a further reduction of
  • the falling film evaporation is expediently operated at 65-75 ° C., preferably at about 70 ° C.
  • the dehydration in the falling film evaporation is driven so far that the lactose solution then has a solids content of 65-70% DM.
  • the portion of the mother liquor separated from the product precipitate is previously subjected to membrane filtration (e.g., micro, ultrafiltration, or nanofiltration) to remove protein from falling film evaporation.
  • membrane filtration e.g., micro, ultrafiltration, or nanofiltration
  • a crystallization device designed as a continuously operated cooling crystallizer with forced circulation
  • Lactose solution leads to the crystallizer
  • the falling film evaporator can advantageously also be designed as a multi-stage system.
  • the crystallization device is connected to a vacuum generating device.
  • a membrane filter system for example a micro, ultra or nanofilter system for the separation of proteins is switched on in the line leading from the solid / liquid separator to the falling film evaporator.
  • FIG. 1 shows a plant scheme for the method
  • FIG. 2 shows a system example with falling film evaporator and cooling crystallizer.
  • the plant scheme exemplified in Fig. 1 provides that from an unillustrated source (e.g., cheese making) an aqueous lactose solution L0 is first fed to a membrane filtration NF (e.g., nanofiltration) in which, for example, 98% of the originally contained protein is removed.
  • the solution L1 thus obtained then passes into a device for Vorkonzentritation the solution.
  • This may be formed, for example, as a pre-evaporation or as in the illustrated scheme as a reverse osmosis device RO. In preconcentration, most of the water is removed from the solution so that it reaches a content of about 4-8% DM.
  • This preconcentrated solution L2 is, as shown in the more detailed partial representation with the same reference numerals for functionally identical parts in Fig. 2, in a falling-film evaporator 1 for high concentration of the solution L2 by water evaporation.
  • This falling film evaporator 1 could also be designed in several stages. The one at a
  • Operating temperature of the falling film evaporator 1 for example, 70 ° C vaporized water content is withdrawn as vapors and condensed in a condenser C1.
  • a highly concentrated solution L3 which typically has a content of e.g. 65-70% TS
  • a cooling crystallizer 2 which has the constant circulation of crystal suspension via an equipped with a pump P2 external line circuit KR.
  • the line circuit KR e.g. also an internal agitator may be provided in the crystallizer 2.
  • the supply line of the highly concentrated solution L3 can, as shown, open into the circulation line or directly into the crystallization space of the cooling crystallizer 2.
  • Cooling crystallizer 2 is preferably used to withdraw the vapors formed in its upper part by evaporation to a non-illustrated
  • Vacuum generator V connected, the vapors to Condensation can be performed by a capacitor C2.
  • the saturation limit of the solution is exceeded, so that lactose crystallized and grows to ever-growing grains.
  • the lactose monohydrate crystallizate continuously formed in this way can be withdrawn from the lower part of the cooling crystallizer 2 through a line SP as a suspension and fed to a solid / liquid separation device 3 (eg decanter and / or centrifuge) in which the entrained mother solution is separated from the lactose product crystallizate K.
  • a portion of the separated mother liquor may be returned to the inlet of the falling film evaporator 1 through a conduit MR, while a smaller portion of the mother liquor is discharged as reject A from the process to avoid concentrating contaminants.
  • the usual further steps for working up the lactose crystallizate produced have not been shown.
  • the inventive method allows a particularly high yield of highly pure lactose without large amounts of wastewater, especially when the recycled mother liquor is subjected to a removal of protein and minerals. LIST OF REFERENCE NUMBERS

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Saccharide Compounds (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

Pour produire en continu des cristaux de lactose monohydraté de haute qualité à partir d'une solution, l'invention propose de concentrer davantage la solution préconcentrée (L2) dans un évaporateur à film tombant (1) et de l'amener ensuite dans une unité de cristallisation par refroidissement en continu (2) avec circulation forcée (KR) dont on extrait une suspension de lactose (SP), donnant le produit cristallisé après séparation de la solution introduite en même temps. Le produit cristallisé (K) est obtenu directement, sans autres étapes de cristallisation, par séparation solide/liquide (3) à partir de la suspension extraite de l'unité de cristallisation par refroidissement (2). Une partie de la solution mère séparée du produit cristallisé (K) est recyclée en amont de l'entrée de l'évaporateur à film tombant (1) et le reste de la solution mère (A) est évacué.
EP15705553.4A 2014-02-13 2015-02-10 Procédé et installation de production de cristaux de lactose Withdrawn EP3105356A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014101843.5A DE102014101843A1 (de) 2014-02-13 2014-02-13 Verfahren und Anlage zur Erzeugung eines Laktose-Kristallisats
PCT/EP2015/052725 WO2015121238A1 (fr) 2014-02-13 2015-02-10 Procédé et installation de production de cristaux de lactose

Publications (1)

Publication Number Publication Date
EP3105356A1 true EP3105356A1 (fr) 2016-12-21

Family

ID=52544466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15705553.4A Withdrawn EP3105356A1 (fr) 2014-02-13 2015-02-10 Procédé et installation de production de cristaux de lactose

Country Status (5)

Country Link
US (1) US20160340750A1 (fr)
EP (1) EP3105356A1 (fr)
AU (1) AU2015217727A1 (fr)
DE (2) DE102014101843A1 (fr)
WO (1) WO2015121238A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2016370303A1 (en) * 2015-12-15 2018-07-26 A. Kent Keller Dryer for lactose and high lactose products
DE102016114947B4 (de) 2016-08-11 2018-02-22 Gea Niro Pt B.V. Verfahren zur Hochkonzentrierung von wässrigen Lösungen und Anlage zur Durchführung des Verfahrens
CN107032429A (zh) * 2017-04-13 2017-08-11 江苏瑞升华能源科技有限公司 一种反渗透浓水处理系统及处理工艺
CN109173329B (zh) * 2018-10-31 2023-08-29 浙江新和成股份有限公司 用于蒸发结晶的装置
WO2020088294A1 (fr) 2018-10-31 2020-05-07 浙江新和成股份有限公司 Dispositif d'évaporation et de cristallisation
CN113797562A (zh) * 2020-06-12 2021-12-17 中国石油化工股份有限公司 一种蒸发结晶的方法和系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FI78504C (fi) * 1987-10-14 1989-08-10 Valio Meijerien Foerfarande foer tillvaratagande av laktos ur vassla.
DE19839209A1 (de) * 1998-08-28 2000-03-02 Fraunhofer Ges Forschung Verfahren zur Gewinnung von festen Stoffen aus Lösungen
DK1488180T3 (da) * 2002-03-04 2014-11-03 Relco Llc Fremgangsmåde til tørring af vandige fluider med højt lactoseindhold
FR2844280B1 (fr) * 2002-09-06 2006-05-26 Applexion Ste Nouvelle De Rech Procede de production de lactose a partir de lactoserum ou d'un permeat resultant de l'ultrafiltration de lactoserum
DE102008007155B4 (de) * 2008-02-01 2014-04-30 Gea Messo Gmbh Verfahren und Vorrichtung zur kontinuierlichen Herstellung eines grobkörnigen kristallinen Ammoniumsulfat-Produkts
US9315533B2 (en) 2010-10-07 2016-04-19 Fonterra Co-Operative Group Limited Lactose crystallisation
DK2617727T3 (da) * 2012-01-22 2017-11-27 Dmk Deutsches Milchkontor Gmbh Proces til forbedring af udbytte i genvindingen af laktose i alt væsentligt fri for mineraler fra valle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015121238A1 *

Also Published As

Publication number Publication date
US20160340750A1 (en) 2016-11-24
DE202015009329U1 (de) 2017-02-23
DE102014101843A1 (de) 2015-08-13
WO2015121238A1 (fr) 2015-08-20
AU2015217727A1 (en) 2016-07-21

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