US2035990A - Process for mechanically producing coarse crystalline deposits - Google Patents

Process for mechanically producing coarse crystalline deposits Download PDF

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Publication number
US2035990A
US2035990A US719415A US71941534A US2035990A US 2035990 A US2035990 A US 2035990A US 719415 A US719415 A US 719415A US 71941534 A US71941534 A US 71941534A US 2035990 A US2035990 A US 2035990A
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United States
Prior art keywords
trough
belt
crystallization
solution
crystals
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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 - Lifetime
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US719415A
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English (en)
Inventor
Siegler Robert
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AKTIEN-GESELLSCHAFT DER CHEMISCHEN PRODUKTENFABRIKEN POMMERENSDORF-MILCH
DER CHEMISCHEN PRODUKTENFABRIK
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DER CHEMISCHEN PRODUKTENFABRIK
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange

Definitions

  • the crystallization operation is carried out with the liquid in motion, whilst in order to obtain coarse crystals the crystallization is efiected from an absolutely tranquil liquid.
  • the present process fills the gaps existing in the crystallization art as regards the crystal size of 7 crystal deposits prepared mechanically and in tranquility.
  • the basic conditions for the growth of large crystals viz. time and tranquillity, are applied to crystallization with motion. This is attained by creating a large cooling surface in order to accelerate the crystallization, but during the cooling of the solution any motion of the same with respect to the cooling walls of the crystallizer is limited as far as possible.
  • an endless band or belt guided uniformly over rollers is used, the upper-part of said band being mounted so that it forms a trough.
  • the trough formed by mounting in this way may be cooled on all sides by gas and also from underneath by liquid.
  • the cross section of the trough may be suitably formed according to the nature of the mounting employed; the cross section is preferably like the segment of a circle, or trapezium-shaped, or parabolic.
  • the fiat trapezium shape is to be preferred.
  • the circle segment form requires the simplest under-support.
  • the parabolic cross section is produced by suspending the transport belt at the edges, the under-supports being wholly dispensed with.
  • the crystallization operation is perfectly uniform and automatic. Owing to the very slow mo- 10 tion of the conveyor belt the power consumption is extraordinarily small.
  • the endless belt suitably shaped at the edges, may be made of rubber or some suitable metal, according to the chemical properties of the solution to be crystallized.
  • FIG. 1 shows a longitudinal section through the apparatus
  • Fig. 2 shows a cross section through a belt mounted so as to form a trough which in section is shaped like a segment of a circle having a corresponding under-support
  • Fig. 3 shows a cross section through a belt mounted so as to form a trough which is trapezium shaped in section, having roller under-supports (of. Fig. 1), and
  • Fig. 4 shows a cross section through a belt mounted with parabolic suspension.
  • the suspension shown in Fig. 4 is adapted for the production of particularly coarsely granular material, as well as for use when water cooling is to be employed.
  • the upper part of the belt I is brought into the necessary trough shape 3, which ensures the maintenance of a certain liquid level throughout the whole length of the trough, by means of inserted rollers 2. In this way the formation or growth of crystals corresponding to the depth of the liquid is rendered possible.
  • the shape of the cross section of the trough affects the uniformity of the crystal deposit and the production 5 of a uniform crystal deposit of definite size is best ensured by the use of a cross section of flat trapezium shape (Fig. 3).
  • an enclosing structure 4 made of wood or the like.
  • Water cooling is preferably accomplished by dipping the crystallization trough into a vessel, likewise troughshaped, adapted to the shape of the crystallization trough, the cooling liquid advantageously moving in counter-current to the solution.
  • the spontaneous surface cooling of the solution by the outer a'ir' may be promoted by means of a fan or blower 5; it is also possible to cool down the belt at its under surface in the same way.
  • the removal of the crystal deposit from the belt is effected automatically by change in shape of the trough e. g.
  • the substances to be crystallized are obtained in the. characteristic forms corre sponding to their particular nature; for example, potassium chlorate is obtained in plates, sodium sulphate and magnesium, sulphate in needles, that is to say, the salts are obtained with the'typical' characteristics of tranquil crystallization.
  • the size of the crystals isa function of the depth of the liquid layer in the belt and the nature of the cooling; by employing: Water cooling or air cooling, or a combination of both, the crystal size may be varied within Wide limits, as a result of which the individual crystallographic properties. of the body are sharply brought out.
  • a method of crystallizing a solution with continuous production of a coarse crystalline deposit consisting in supplying the solution to a continuously moving surface which is temporarily given a trough-like shape near the point at which the solution is supplied, and at a point removed from this in the path of the surface, changing the direction of the latter and simultaneously de-' priving, it of its trough-like shape, and continue ously removing'the crystals from said surface at the place where the surface changes its direction.
  • a method of crystallizing a solution with continuous production of a coarse crystalline deposit consisting in supplying the solution to a continuously moving surface which is temporarily given a trough-like shape near the point at which the solution is supplied, conducting the trough shaped surface supporting the solution supplied solution, and then changing the directionof the surface and simultaneously depriving it of its trough-like shape, and continuously removing the crystals from said surface at the place where the surface changes its direction.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
US719415A 1933-01-04 1934-04-06 Process for mechanically producing coarse crystalline deposits Expired - Lifetime US2035990A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA68220D DE605121C (de) 1933-01-04 1933-01-04 Verfahren und Vorrichtung zur mechanischen Gewinnung von Grobkristallisat

Publications (1)

Publication Number Publication Date
US2035990A true US2035990A (en) 1936-03-31

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US719415A Expired - Lifetime US2035990A (en) 1933-01-04 1934-04-06 Process for mechanically producing coarse crystalline deposits

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US (1) US2035990A (fr)
DE (1) DE605121C (fr)
FR (1) FR769811A (fr)
GB (1) GB415346A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808236A (en) * 1953-04-29 1957-10-01 Diamond Alkali Co Crystallizing apparatus
US2847285A (en) * 1954-02-09 1958-08-12 Fonte Electr S A Process for manufacturing crystallized pure and anhydrous phosphoric acid, and installation for carrying out said process
US3838973A (en) * 1971-11-02 1974-10-01 Vennard & Ellithorpe Ltd Apparatus for the solidification of molten sulphur
US3885920A (en) * 1971-12-14 1975-05-27 Vennard & Ellipthorpe Ltd Method for the solidification of molten sulphur
US3908001A (en) * 1971-11-18 1975-09-23 Energy Dev Ass Manufacture of chlorine hydrate
US3912431A (en) * 1970-12-24 1975-10-14 Vennard & Ellithorpe Apparatus for the solidification of molten sulphur
US4283247A (en) * 1979-06-21 1981-08-11 Texas Instruments Incorporated Liquid phase epitaxial process for magnetic garnet

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026726B (de) * 1955-01-07 1958-03-27 Diamond Alkali Co Verfahren und Vorrichtung zum Kristallisieren aus der Schmelze
JPS58177952A (ja) * 1982-04-12 1983-10-18 Ajinomoto Co Inc Ｌ−α−アスパルチル−Ｌ−フエニルアラニンメチルエステルの晶析法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808236A (en) * 1953-04-29 1957-10-01 Diamond Alkali Co Crystallizing apparatus
US2847285A (en) * 1954-02-09 1958-08-12 Fonte Electr S A Process for manufacturing crystallized pure and anhydrous phosphoric acid, and installation for carrying out said process
US3912431A (en) * 1970-12-24 1975-10-14 Vennard & Ellithorpe Apparatus for the solidification of molten sulphur
US3838973A (en) * 1971-11-02 1974-10-01 Vennard & Ellithorpe Ltd Apparatus for the solidification of molten sulphur
US3908001A (en) * 1971-11-18 1975-09-23 Energy Dev Ass Manufacture of chlorine hydrate
US3885920A (en) * 1971-12-14 1975-05-27 Vennard & Ellipthorpe Ltd Method for the solidification of molten sulphur
US4283247A (en) * 1979-06-21 1981-08-11 Texas Instruments Incorporated Liquid phase epitaxial process for magnetic garnet

Also Published As

Publication number Publication date
DE605121C (de) 1934-11-05
FR769811A (fr) 1934-08-31
GB415346A (en) 1934-08-23

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