Multi-phase crystallization method

A crystallization and crystallizer technology, applied in the direction of solution crystallization, can solve the problems of low production capacity and crystallizer scarring, and achieve the effect of improving production capacity and good technical effect.

Inactive Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of severe crystallization and low production capacity existing in the existing crystallization method, and a method for multiphase crystallization is provided

Method used

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Embodiment 1

[0020] Method for separating p-xylene from mixed xylene of the present invention

[0021] Such as figure 2 Said, the mixed xylene raw material 2 from the raw material tank 1 and the diluent 14 from the diluent storage tank 13 are crystallized in the crystallizer 3, wherein the concentration of p-xylene in the mixed xylene raw material is 81% (mass), The concentration of m-xylene is 19% (mass), the mass ratio of the diluent 14 to the mixed xylene raw material 2 is 0.2:1, the diluent is ammonia water, the crystallizer crystallization temperature is -15℃, the crystal slurry 4 is solid-liquid After separation by separator 5, crystals 6 and a mixture of diluent and crystallization mother liquor 8 are obtained; crystals 6 are washed by diluent 15 and enter product tank 7, and the detergent is ammonia; the mixture 8 of diluent and crystallization mother liquor is separated by separator 9 The crystallization mother liquor 10 and the diluent 12 enter the mother liquor tank 11, and the d...

Embodiment 2

[0023] Method for separating p-xylene from mixed xylene of the present invention

[0024] Such as figure 2 Said, the mixed xylene raw material 2 from the raw material tank 1 and the diluent 14 from the diluent storage tank 13 are crystallized in the crystallizer 3, wherein the concentration of p-xylene in the mixed xylene raw material is 81% (mass), The concentration of m-xylene is 19% (mass), the mass ratio of the diluent 14 to the mixed xylene raw material 2 is 0.5:1, the diluent is ammonia, the crystallizer crystallization temperature is -25°C, the crystal slurry 4 is solid-liquid After separation by separator 5, crystals 6 and a mixture of diluent and crystallization mother liquor 8 are obtained; crystals 6 are washed by diluent 15 and enter product tank 7, and the detergent is ammonia; the mixture 8 of diluent and crystallization mother liquor is separated by separator 9 The crystallization mother liquor 10 and the diluent 12 enter the mother liquor tank 11, and the diluen...

Embodiment 3

[0026] Method for separating p-xylene from mixed xylene of the present invention

[0027] Such as figure 2 Said, the mixed xylene raw material 2 from the raw material tank 1 and the diluent 14 from the diluent storage tank 13 are crystallized in the crystallizer 3, wherein the concentration of p-xylene in the mixed xylene raw material is 81% (mass), The concentration of m-xylene is 19% (mass), the mass ratio of the diluent 14 to the mixed xylene raw material 2 is 0.5:1, the diluent is methanol, the crystallizer crystallization temperature is -25℃, and the slurry 4 is solid-liquid After separation by separator 5, crystals 6 and a mixture of diluent and crystallization mother liquor 8 are obtained; crystals 6 are washed by diluent 15 and then enter product tank 7, and the detergent is methanol; the mixture 8 of diluent and crystallization mother liquor is separated by separator 9 The crystallization mother liquor 10 and the diluent 12 enter the mother liquor tank 11, and the dilu...

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Abstract

The invention relates to a multi-phase crystallization method which is mainly used for solving the problems that in the prior art, crystallizer scares are serious and the production capability is low. In order to solve the problems in the prior art, the technical scheme adopted by the invention is as follows: the method comprises the following steps: performing crystallization on raw materials and a diluent in a crystallizer; separating crystal mush to obtain crystal and a mixture of the a thinner and crystallizing mother liquid; washing the crystal, and feeding the washed crystal into a product jar; separating the mixture of the thinner and the crystallizing mother liquid so as to obtain the crystallizing mother liquid and the thinner, feeding the crystallizing mother liquid into a mother liquid jar, and returning the thinner to a thinner storage jar, wherein the thinner is not subjected to separation by crystallization; and the weight ratio of the thinner and raw material in the crystallizer is (0.1-50):1, and the solubility of the thinner in the raw material is less than 1 g thinner / 100 g raw material. The method can be applied to industrial crystallization production.

Description

Technical field [0001] The invention relates to a method of multiphase crystallization. Background technique [0002] The indirect cooling crystallization method is a widely used crystallization method in the industry. Compared with the direct cooling crystallization method, the salting-out method, and the reactive crystallization method, it does not need to add other substances to the crystallization mother liquor. It is comparable to the evaporation concentration method and the vacuum cooling crystallization method. Compared with, its energy consumption is lower. However, the shortcomings of the indirect cooling crystallization method are that the heat transfer efficiency of the indirect cooling process is low, and the cooling surface is easy to form crystal scars. Once the heat transfer surface is scarred, the heat transfer effect will be further sharply deteriorated. In severe cases, the production can be reduced. Work properly. In order to prevent the crystal from scarring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02
Inventor 肖剑陈亮钟禄平郭艳姿卢咏琰
Owner CHINA PETROLEUM & CHEM CORP
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