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Discontinuous crystallization units for the preparation of spherical crystals

一种结晶单元、球形晶体的技术，应用在不连续结晶单元领域，达到工艺精确可控、优异控制、设计简单的效果

Active Publication Date: 2020-05-19
ERUCA TECH SRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this method, very small particles (fragments) will additionally be formed, which is disadvantageous

Method used

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  • Discontinuous crystallization units for the preparation of spherical crystals
  • Discontinuous crystallization units for the preparation of spherical crystals
  • Discontinuous crystallization units for the preparation of spherical crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] For the preparation of spherical crystals of ammonium perchlorate, a discontinuous crystallization unit is used, comprising a crystallizer (1) consisting of a metal cylindrical container of enamelled metal, the metal The internal surface of the cylindrical vessel is polished stainless steel, has an oval or circular cross-section, has a tapered or arched bottom (12), and is fitted with a double jacket (4 ), for cooling the solution and / or the suspension of the solution and crystals; and a stainless steel high-speed stirrer (8) having a drive (9) for speed control and thus Together with the internal surface of the vessel containing 2 polished stainless steel baffles (5) to control the impact rate of the mechanical action of the stirrer on the roundness of the crystals inside the vessel, at the same time an orifice (10) is installed on the top of the vessel, which will be independent from the outside 1 loop of the circulation line (11) is connected to said orifice (10) for...

Embodiment 2

[0065] The same discontinuous crystallization unit as in Example 1 is used, but it comprises 2 circulation loops 11,11' for feeding heated solution or solutions using circulation pumps 2,2' and via heat exchangers 3,3' and Heated suspensions of crystals, such as figure 2 shown.

[0066] This arrangement of the unit makes it possible to increase the number of crystallization cycles with the same cooling rate and / or to reduce the flow rate in the branches of the circulation loop.

[0067] The overall APC crystal preparation process is the same as that in Example 1.

[0068] The resulting crystals have a more rounded shape; moreover, compared to Example 1, they exhibit the same purity and particle distribution.

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Abstract

The invention relates to a discontinuous crystallization unit for the preparation of spherical crystals, comprising a crystallizer (1) consisting of a metal cylindrical container with a hard material inner surface, with an elliptical shaped or circular cross-section and tapered or arched bottom (12), along the length of said metal cylindrical vessel is mounted a replicator (4) for cooling the solution and / or suspension of solution and crystals; and hard A high-speed stirrer (8) for the material with a drive (9) that achieves speed control and is thus connected to the interior of the vessel with at least 2 hard material baffles (5) The surfaces together control the impact rate of the mechanical action of the stirrer on the crystal roundness in the container, and at the same time at least 1 orifice (10) is installed on the top of the container, and the branch of at least 1 independent circulation loop (11) is connected to the said at least 1 orifice (10) for feeding heated solution and / or heated solution and suspension of crystals via at least 1 circulation pump (2) and via at least 1 heat exchanger (3) , which together with the replicator (4) ensures a controlled periodic variation of the temperature of the crystal suspension around the cooling curve, while connecting the interconnection (13) pipeline to the crystallizer (1) vessel bottom (12), which connects At least one branch to the circulation loop (11).

Description

[0001] field of invention [0002] The present invention relates to discrete crystallization units for the preparation of small to medium sized spherical crystals, preferably ammonium perchlorate (APC) crystals. Background technique [0003] In the prior art, various methods are described for the preparation of spherical crystals. It is known from both theory and practice that smaller crystals exhibit higher solubility than larger crystals and that rectangular crystal surfaces dissolve more readily than spherical surfaces. Crystallization in such a way that the temperature fluctuates periodically around the temperature of the saturated solution is based on this phenomenon. Therefore, crystal nuclei, smaller crystals, and rectangular crystal surfaces are more easily dissolved, while larger crystals, on the other hand, show preferential growth. In this way, a roughly granular product is prepared. [0004] An example of such a method for preparing spherical crystals is found i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/00C01B11/18C06B21/00C06B29/00
CPCB01D9/00B01D9/0009B01D9/0036B01D9/0063B01D2009/0086C06B21/0066C06B29/22B01D9/0013C01B11/185C30B7/08C30B29/60
Inventor M·索切克J·密西克J·库普卡
Owner ERUCA TECH SRO
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