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Dynamic crystallization equipment and dynamic crystallization method

A crystallization equipment and dynamic technology, applied in the direction of solution crystallization, heat exchange cooling crystallization, etc., can solve the problems of difficulty in obtaining crystals with uniform particle size, limited fluidity and mixing of the liquid to be crystallized, and achieve safe and reliable industrial applications. Complete, easy-to-use effects

Active Publication Date: 2016-06-15
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a dynamic crystallization equipment, so as to solve the problem in the prior art that in the crystallization process of the solvent method, the fluidity and mixing of the liquid to be crystallized are limited, and it is difficult to obtain crystals with uniform particle size

Method used

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  • Dynamic crystallization equipment and dynamic crystallization method
  • Dynamic crystallization equipment and dynamic crystallization method
  • Dynamic crystallization equipment and dynamic crystallization method

Examples

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Effect test

Embodiment 1

[0029] The dynamic crystallization equipment of the present embodiment, such as figure 1 As shown, it includes a crystallization kettle 1 equipped with a cooling jacket 3, and a material inlet 5 is provided on the crystallization kettle. The material inlet can be used to feed inert gas to maintain positive pressure in the kettle, or to feed liquid to be crystallized. ; The bottom of the crystallization kettle is provided with a discharge port 16; the outside of the crystallization kettle is provided with a still external circulation channel, and the still external circulation channel has two liquid suction ports, which are respectively the first liquid suction port 13 and the second liquid suction port 15, and also have Common liquid discharge port 17, the first liquid suction port is connected with the discharge port at the bottom of the crystallization kettle, the second liquid suction port 15 is connected with the middle part of the crystallization kettle, and the shared liq...

Embodiment 2

[0032] The dynamic crystallization equipment of the present embodiment, such as figure 2As shown, it includes a crystallization kettle 1 equipped with a cooling jacket 3, and a material inlet 5 is provided on the crystallization kettle. The material inlet can be used to feed inert gas to maintain positive pressure in the kettle, or to feed liquid to be crystallized. ; The bottom of the crystallization kettle is provided with a discharge port 16; the outside of the crystallization kettle is provided with an external circulation channel of the kettle, and the external circulation channel of the kettle has three liquid suction ports, which are respectively connected to the bottom, middle and upper parts of the crystallization kettle, which are respectively the first liquid suction Port 13, the second liquid suction port 14 and the third liquid suction port 15 also have a common liquid discharge port 17, and the common liquid discharge port is connected to the upper part of the cr...

Embodiment 3

[0035] The dynamic crystallization equipment of the present embodiment, such as image 3 Shown, comprise crystallization still and the filter drier 7 that links to each other with crystallization still, the structure of crystallization still is identical with embodiment 2, and filter drier 7 draws the mixture in the crystallization still to filter drier inside by pumping device; The device includes a liquid suction pipe extending into the inside of the crystallization kettle, and a liquid suction pump 6 connected to the liquid suction pipe. The outlet of the liquid suction pump is connected with the material inlet and outlet 11 of the filter drier; The plate 10 is provided with a mother liquor outlet 8 at the bottom. The jacket of the filter drier is provided with a heat medium jacket 9, and the heat medium jacket is provided with a heat medium inlet 91 and a heat medium outlet 92, and the heat medium inlet is located below the heat medium outlet.

[0036] When the equipment ...

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Abstract

The invention discloses dynamic crystallization equipment and a dynamic crystallization method. The dynamic crystallization equipment comprises a crystallization kettle, wherein a kettle outside circulation channel is arranged outside the crystallization kettle and is used for realizing circulation flow of to-be-crystallized liquid inside and outside the kettle; the kettle outside circulation channel is provided with two liquid absorbing inlets or more, and the liquid absorbing inlets are connected to parts, with different heights, of the crystallization kettle, and are used for realizing the circulation flow of the to-be-crystallized liquid at the parts with different heights. According to the dynamic crystallization equipment, by arranging liquid sucking points with different heights, good circulation flow and mixing of the to-be-crystallized liquid in the crystallization kettle can be realized in the initial stage of crystallization, and crystal nucleuses uniform in size can be formed favorably; in the later stage of crystallization, crystal particles gather at the middle-lower part of the crystallization kettle, and closing lower circulation can be selected, so that the liquid circulates at the middle-upper part of the crystallization kettle, thus the fine crystal particles can continuously grow, and finally crystal particles uniform in particle size and complete in crystal form are obtained.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a dynamic crystallization equipment and a dynamic crystallization method. Background technique [0002] For the crystallization process of the solvent method, the traditional static crystallization, because the process is not easy to control, the crystal particles formed are relatively large, and the complex formed by the solvent and the solute will be coated in the crystal of the product, which is difficult to remove in the subsequent heating and drying process , reducing product purity; Taking the crystallization of lithium hexafluorophosphate as an example, the industrialized production method of lithium hexafluorophosphate is mostly hydrofluoric acid solvent method at present, obtains lithium hexafluorophosphate solution with lithium hexafluorophosphate as solute and hydrofluoric acid as solvent, and the crystallization process of lithium hexafluorophosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02
CPCB01D9/0009
Inventor 侯红军杨华春李云峰薛旭金闫春生张永明晁金伟贾棉贾蕾蕾王艳君
Owner DO FLUORIDE CHEM CO LTD