FR2602153A1 - Process for the production of a seeding magma for a continuously operating crystalliser - Google Patents
Process for the production of a seeding magma for a continuously operating crystalliser Download PDFInfo
- Publication number
- FR2602153A1 FR2602153A1 FR8611190A FR8611190A FR2602153A1 FR 2602153 A1 FR2602153 A1 FR 2602153A1 FR 8611190 A FR8611190 A FR 8611190A FR 8611190 A FR8611190 A FR 8611190A FR 2602153 A1 FR2602153 A1 FR 2602153A1
- Authority
- FR
- France
- Prior art keywords
- cooked
- mass
- grinder
- fraction
- mother liquor
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- 238000010899 nucleation Methods 0.000 title abstract 2
- 239000013078 crystal Substances 0.000 claims abstract description 16
- 239000012452 mother liquor Substances 0.000 claims abstract description 10
- 238000007865 diluting Methods 0.000 claims abstract description 3
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000001627 detrimental effect Effects 0.000 abstract 1
- 238000003801 milling Methods 0.000 abstract 1
- 239000006188 syrup Substances 0.000 description 9
- 235000020357 syrup Nutrition 0.000 description 9
- 239000003085 diluting agent Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0036—Crystallisation on to a bed of product crystals; Seeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Jellies, Jams, And Syrups (AREA)
Abstract
Description
La présente invention a pour objet un procédé de production d'un magma d'ensemencement pour un appareil de cristallisation a marche continue à partir d'une fraction de la masse-cuite produite par cet appareil consistant à diluer cette fraction de la masse-cuite pour réduire sa viscosité et a l'introduire dans un broyeur ah les cristaux qu'elle contient sont broyés au sein de la liqueur-mère. Ce procédé a fait l'objet du brevet français 1.597.729. The subject of the present invention is a method for producing a seed magma for a continuous-running crystallization apparatus from a fraction of the mass-cooked produced by this apparatus, consisting in diluting this fraction of the mass-cooked to reduce its viscosity and to introduce it into a grinder ah, the crystals which it contains are ground in the mother liquor. This process was the subject of French patent 1,597,729.
Lorsqu'il est utilisé en sucrerie ce procédé produit un magma contenant une forte proportion de très petits cristaux (fines) ce qui a une influence néfaste sur la qualité de la masse-cuite. When used in sweets this process produces a magma containing a high proportion of very small (fine) crystals which has a harmful influence on the quality of the mass-cooked.
Le but de la présente invention est de remédier à cet inconvèni ent. The object of the present invention is to remedy this drawback.
Le procédé objet de la présente invention est caractérisé en ce que la liqueur-mère de ladite fraction de masse-cuite est maintenue en état de légère sous-saturation, c'est-#-dire avec un coefficient de saturation compris entre ,9 et 1, pendant le broyage, pour assurer la refonte des très fins cristaux produits. Pour amener la liqueur-mère en état de sous-saturation, on pourra réchauffer le liquide utilisé pour diluer la masse-cuite ou injecter de la vapeur dans l'appareil où s'effectue cette opération
Avantageusement, la température dans le broyeur sera réglée a la valeur convenable au maintien de la sous-saturation en chauffant cet appareil par circulation d'un fluide dans une double enveloppe ou au moyen de résistances électriques ou en y injectant de la vapeur.The process which is the subject of the present invention is characterized in that the mother liquor of the said mass-cooked fraction is maintained in a state of slight undersaturation, that is to say with a coefficient of saturation between, 9 and 1, during grinding, to ensure the recasting of the very fine crystals produced. To bring the mother liquor into a state of undersaturation, you can heat the liquid used to dilute the mass-cooked or inject steam into the device where this operation is carried out
Advantageously, the temperature in the grinder will be adjusted to the value suitable for maintaining the undersaturation by heating this apparatus by circulation of a fluid in a double jacket or by means of electrical resistances or by injecting steam therein.
A la sortie du broyeur, la magma obtenu pourra être soumis à une opération de tamisage pour éliminer les gros cristaux qui seront recyclés en amont du broyeur. At the outlet of the mill, the magma obtained can be subjected to a sieving operation to remove the large crystals which will be recycled upstream of the mill.
La description qui suit se réfère au dessin l'accompagnant qui est le schéma d'une installation pour la mise en oeuvre du procédé de l'invention en sucrerie. The following description refers to the accompanying drawing which is the diagram of an installation for implementing the method of the invention in a sugar refinery.
Cette installation comprend essentiellement un appareil de cristallisation à marche continue 10, un malaxeur 12, un mélangeur-dilueur 14, un broyeur 16, un malaxeur à magma 18, un échangeur de chaleur 20 et des pompes 22, 24, 26 et 28. This installation essentially comprises a continuous-running crystallization apparatus 10, a mixer 12, a mixer-diluter 14, a grinder 16, a magma mixer 18, a heat exchanger 20 and pumps 22, 24, 26 and 28.
Tous ces appareils sont connus et couramment utilisés en sucrerie.All these devices are known and commonly used in the sugar industry.
La masse-cuite produite dans l'appareil 10 est extraite en continu par la pompe 22 qui alimente le malaxeur 12. Une fraction de la masse-cuite est prélevée au moyen de la pompe 24 et envoyée au mélangeur-dilueur 14 qui est également alimente en sirop par la pompe 28. novant d'alimenter l'appareil 14 le sirop est réchauffé dans l'échangeur 20 au moyen d'eau chaude i un régulateur 30 maintient la température du sirop sortant de 1 'échangeur 20 à une valeur de consigne en agissant sur une vanne contrôlant le débit d'eau. La consigne de régulateur de température 30 est fonction du brix du sirop, mesuré par le gammadensimètre 40. The mass-cooked produced in the apparatus 10 is continuously extracted by the pump 22 which feeds the mixer 12. A fraction of the mass-cooked is removed by means of the pump 24 and sent to the mixer-diluent 14 which is also supplied in syrup by the pump 28. novel to supply the device 14 the syrup is heated in the exchanger 20 by means of hot water i a regulator 30 maintains the temperature of the syrup leaving the exchanger 20 at a set value by acting on a valve controlling the water flow. The temperature regulator setpoint 30 is a function of the brix of the syrup, measured by the gammadensimeter 40.
La masse-cuite diluée sortant du mélangeur 14 alimente le broyeur 16 ; sa dilution est réglée au moyen du régulateur 32 qui agit sur une vanne contrôlant le débit de sirop entrant dans l'appareil 14 en fonction des informations fournies par un gammadensimètre 34 qui mesure la compacité de la masse-cuite. En variante, cette régulation pourrait être basée sur une mesure de la perte de charge sur une longueur prédéterminée de la conduite reliant le dilueur 14 au broyeur 16. Suivant une autre variante, le débit de sirop de dilution pourrait être maintenu proportionnel au débit de masse-cuite prélevée au moyen de la pompe 24. The diluted mass-cooked leaving the mixer 14 feeds the crusher 16; its dilution is adjusted by means of the regulator 32 which acts on a valve controlling the flow of syrup entering the apparatus 14 according to the information provided by a gammadensimeter 34 which measures the compactness of the mass-cooked. As a variant, this regulation could be based on a measurement of the pressure drop over a predetermined length of the pipe connecting the diluter 14 to the mill 16. According to another variant, the flow rate of dilution syrup could be kept proportional to the mass flow rate -cooked sampled by means of pump 24.
Dans le broyeur 16, les cristaux de la masse-cuite sont cassés par chocs de telle sorte que la dimension moyenne des cristaux contenus dans le magma sortant du broyeur est environ le tiers de celle des cristaux contenus dans la masse-cuite diluée y entrant. Le broyeur pourra, par exemple, être du type dit colloïdal et constitué par un stator annulaire et un rotor disposé coaxialement à l'intérieur de celui-ci de façon å délimiter entre eux un espace de broyage à section annulaire, les surfaces en regard du stator et du rotor étant munies de dentures. In the crusher 16, the crystals of the massecuite are broken by impact such that the average size of the crystals contained in the magma leaving the crusher is approximately one third that of the crystals contained in the diluted massescuite entering it. The crusher could, for example, be of the so-called colloidal type and constituted by an annular stator and a rotor arranged coaxially inside thereof so as to delimit between them a grinding space with annular section, the surfaces facing the stator and rotor being provided with teeth.
Le magma produit est envoyé dans le malaxeur 18 servant de réservoir tampon. Il est soutiré du malaxeur 18 par la pompe 26 qui alimente l'appareil de cristallisation a marche. The magma produced is sent to the mixer 18 serving as a buffer tank. It is withdrawn from the mixer 18 by the pump 26 which supplies the crystallization apparatus on.
continue 10. Le débit de la pompe 26 est réglé, par une chaine de régulation non-représentée, pour satisfaire en permanence aux besoins de l'appareil 10. Un régulateur de niveau 36 commande la vitesse de rotation de la pompe 24 pour maintenir le débit de masse-cuite prélevée proportionnel au débit de magma consommé. continuous 10. The flow rate of the pump 26 is adjusted, by a control chain not shown, to permanently satisfy the needs of the apparatus 10. A level regulator 36 controls the speed of rotation of the pump 24 to maintain the flow of mass-cooked removed proportional to the flow of magma consumed.
La consigne du régulateur de température 30 est choisie pour que la masse-cuite entrant dans le broyeur 16 soit légèrement sous-saturée 'est-a-dire que son coefficient de saturation soit compris dans la fourchette tt 5 a 1,OU. En rendant cette consigne fonction du brin du sirop on réalise un contrôle rigoureux du coefficient de saturation. Pour maintenir la masse-cuite en état de sous-saturation pendant le broyage, la température à l'intérieur du broyeur pourra être contrée au moyen d'un fluide chauffant circulant dans une double enveloppe ou de résistances électriques noyées dans sa paroi ; on pourra aussi, dans le même but, injecter de la vapeur dans le broyeur. The setpoint of the temperature regulator 30 is chosen so that the mass-cooked material entering the grinder 16 is slightly undersaturated, that is to say that its saturation coefficient is included in the range tt 5 to 1, OR. By making this instruction a function of the syrup strand, a rigorous control of the saturation coefficient is carried out. To maintain the mass-cooked in a state of undersaturation during grinding, the temperature inside the grinder can be countered by means of a heating fluid circulating in a double envelope or by electrical resistances embedded in its wall; we can also, for the same purpose, inject steam into the grinder.
Au lieu de réchauffer le sirop de dilution, on pourra aussi injecter de la vapeur dans le mélangeur-dilueur 14 pour amener la masse-cuite en état de sous-saturation Cet état pourra être controlé en réglant la température du magma sortant du dilueur a une valeur de consigne fonction des débits, brix et températures respectifs de la masse-cuite prélevée et du sirop de dilution. Instead of reheating the dilution syrup, we can also inject steam into the mixer-diluter 14 to bring the terracotta into a state of undersaturation. This state can be controlled by adjusting the temperature of the magma leaving the dilutor to a set value depending on the flow rates, brix and respective temperatures of the mass-cooked sampled and the dilution syrup.
A la sortie du broyeur 16, le magma pourra être tamisé pour en extraire les gros cristaux qui seront renvoyés, avec une partie de la liqueur-mère, dans le mélangeur-dilueur 14. At the outlet of the crusher 16, the magma can be sieved to extract the large crystals which will be returned, with part of the mother liquor, to the mixer-diluent 14.
L'appareil de tamisage pourra être du type décrit dans le brevet français NO 86.05046. The screening device may be of the type described in French patent NO 86.05046.
A titre d'exemple , on a produit un magma dont la dimension moyenne des cristaux était de 190 ##m à partir d'une masse-cuite dont la dimension moyenne des cristaux était de 582 m en éliminant par tamisage les cristaux dont les dimensions étaient supérieures à 400 m. For example, a magma was produced whose average crystal size was 190 ## m from a mass-baked whose average crystal size was 582 m by sifting out the crystals whose dimensions were greater than 400 m.
Claims (8)
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8611190A FR2602153B1 (en) | 1986-08-01 | 1986-08-01 | PROCESS FOR PRODUCING A SEEDING MAGMA FOR A CONTINUOUS WORKING CRYSTALLIZATION APPARATUS |
| DE8787401616T DE3763364D1 (en) | 1986-08-01 | 1987-07-09 | METHOD AND DEVICE FOR PRODUCING A VACUUM SUSPENSION FOR A CONTINUOUSLY WORKING CRYSTALIZATION SYSTEM. |
| AT87401616T ATE54055T1 (en) | 1986-08-01 | 1987-07-09 | METHOD AND DEVICE FOR THE PREPARATION OF AN INOCULATION SUSPENSION FOR A CONTINUOUSLY OPERATING CRYSTALLIZATION PLANT. |
| EP87401616A EP0255786B1 (en) | 1986-08-01 | 1987-07-09 | Process and device for producing a magma of seed crystals for a continuous-crystallization apparatus |
| ES87401616T ES2015589B3 (en) | 1986-08-01 | 1987-07-09 | PROCEDURE AND INSTALLATION FOR THE PRODUCTION OF A SEED MAGMA FOR A CONTINUOUS CRYSTALLIZATION APPARATUS. |
| PL1987266837A PL154185B1 (en) | 1986-08-01 | 1987-07-15 | A method of inoculation magma production in a crystallizer of a constant action and a system for inoculation magma production in a crystallizer of a cinstant action |
| ZA875362A ZA875362B (en) | 1986-08-01 | 1987-07-21 | Process and installation for the production of a seeding magma for a continuously-running crystallization apparatus |
| AU75958/87A AU591313B2 (en) | 1986-08-01 | 1987-07-21 | Method and equipment for production of a seeding magma for a continuous crystallization apparatus |
| GR90400444T GR3000634T3 (en) | 1986-08-01 | 1990-07-09 | Process and device for producing a magma of seed crystals for a continuous-crystallization apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8611190A FR2602153B1 (en) | 1986-08-01 | 1986-08-01 | PROCESS FOR PRODUCING A SEEDING MAGMA FOR A CONTINUOUS WORKING CRYSTALLIZATION APPARATUS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2602153A1 true FR2602153A1 (en) | 1988-02-05 |
| FR2602153B1 FR2602153B1 (en) | 1989-08-25 |
Family
ID=9337964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8611190A Expired FR2602153B1 (en) | 1986-08-01 | 1986-08-01 | PROCESS FOR PRODUCING A SEEDING MAGMA FOR A CONTINUOUS WORKING CRYSTALLIZATION APPARATUS |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2602153B1 (en) |
| ZA (1) | ZA875362B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111514604A (en) * | 2020-04-17 | 2020-08-11 | 深圳大学 | A kind of method for preparing high-purity crystal by segmental evaporation crystallization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3642534A (en) * | 1968-12-06 | 1972-02-15 | Fives Lille Cail | Sugar-crystallizing method and apparatus |
| 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 |
| FR2457116A2 (en) * | 1979-05-22 | 1980-12-19 | Fives Cail Babcock | Prodn. of crystallisation nuclei - employs only one centrifuge to separate seeding magma, used for seeding sugar soln. etc. |
-
1986
- 1986-08-01 FR FR8611190A patent/FR2602153B1/en not_active Expired
-
1987
- 1987-07-21 ZA ZA875362A patent/ZA875362B/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3642534A (en) * | 1968-12-06 | 1972-02-15 | Fives Lille Cail | Sugar-crystallizing method and apparatus |
| 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 |
| FR2457116A2 (en) * | 1979-05-22 | 1980-12-19 | Fives Cail Babcock | Prodn. of crystallisation nuclei - employs only one centrifuge to separate seeding magma, used for seeding sugar soln. etc. |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111514604A (en) * | 2020-04-17 | 2020-08-11 | 深圳大学 | A kind of method for preparing high-purity crystal by segmental evaporation crystallization |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA875362B (en) | 1988-01-29 |
| FR2602153B1 (en) | 1989-08-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |