Crystallizing method utilizing external circulation of crystal slurry

A technology of external circulation and crystal slurry, which is applied in solution crystallization, crystallization purification/separation, organic chemistry, etc., can solve the problems of small crystal particle size and frequent crystallizer cleaning, and achieve good technical effects

Active Publication Date: 2012-03-14
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 small crystal size and frequent crystallizer cleaning in the existing crystallization method of external circulation of magma, and a novel crystallization method of external circulation of magma is provided

Method used

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  • Crystallizing method utilizing external circulation of crystal slurry
  • Crystallizing method utilizing external circulation of crystal slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The crystallization method of outer circulation of magma slurry according to the present invention produces p-xylene

[0027] like figure 2 Said, mixed xylene raw material 1 contains 90% p-xylene, and the flow rate is 14864kg / h. The mixed xylene raw material 1 directly enters the kettle crystallizer 2 for crystallization, and the crystallization temperature is -14.5°C. The magma in the tank crystallizer 2 is divided into two parts: magma 3 and magma 9 to flow out. Crystal slurry 3 is separated by centrifugal filter 4 to obtain p-xylene crystals 5 and mother liquor 6 for crystallization and filtration. The p-xylene crystals 5 are discharged as products after being washed by the pure p-xylene melt. The crystallization filtration mother liquor 6 is divided into two shares, and the crystallization filtration mother liquor 7 accounting for 11% by weight of the first share is discharged, and the crystallization filtration mother liquor 8 accounting for 89% by weight of th...

Embodiment 2

[0029] The crystallization method of outer circulation of magma slurry according to the present invention produces p-xylene

[0030] use as image 3 The crystallization method of the external circulation of the magma, wherein the mixed xylene raw material 1 is mixed with the second crystallization and filtration mother liquor 8 and a part of the magma 9 in the kettle crystallizer and then enters the casing type crystallizer 10, and the solid-liquid Separator 4 is a crystal washing tower, and p-xylene crystal 5 is discharged as a product after being washed with pure toluene. All the other operating conditions are the same as in Example 1, and the results are listed in Table 1.

[0031] Table 1

[0032]

Embodiment 3

[0037] The crystallization method of outer circulation of magma slurry according to the present invention produces p-xylene

[0038] use as figure 2 The crystallization method of the external circulation of the magma, wherein the sleeve-type crystallizer 10 is composed of a tube-type heat exchanger with a scraper, the operating temperature is -17.5 ° C, and the remaining operating conditions are the same as in Example 1. The results Listed in Table 2.

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Abstract

The invention relates to a crystallizing method utilizing external circulation of crystal slurry, and is mainly used for solving the problems of small crystal particle size and frequent cleaning of a crystallizer in the prior art. The crystallizing method is characterized in that: the raw materials are introduced into a kettle type crystallizer for crystallization, the crystal slurry in the kettle type crystallizer flows out from the lower part of the kettle type crystallizer by two parts, the crystal slurry I is subjected to separation by a solid-liquid separator to obtain crystals and crystal filtration mother liquor, and the crystal slurry II is subjected to heat exchange by a sleeve type crystallizer and then returned to the kettle type crystallizer, wherein the weight ratio of the crystal slurry I to the crystal slurry II is (1:1)-(1:50); and the crystals are used as a product to be discharged, the crystal filtration mother liquor is divided into two parts, the first part namely crystal filtration mother liquor I which accounts for 5-95wt% of the crystal filtration mother liquor is discharged, and the second part namely crystal filtration mother liquor II which accounts for 5-95wt% of the crystal filtration mother liquor is returned to the kettle type crystallizer together with the crystal slurry II. The technical scheme that the raw materials are introduced to the kettle type crystallizer directly or being mixed with the crystal slurry II better solves the problems, thus the crystallizing method can be used in industrial crystal production.

Description

technical field [0001] The invention relates to a crystallization method with external circulation of magma. Background technique [0002] The kettle-type crystallizer is a type of crystallizer commonly used in industry. It uses the refrigerant in the jacket to exchange heat and cool the raw material, so that the product is crystallized from the raw material. The heat transfer efficiency of indirect heat exchange is low, and crystal scars are easy to form on the cooling surface, and the formed crystal scars will further reduce the heat transfer efficiency. Therefore, the production capacity of the kettle crystallizer is not high, and its production capacity is limited by the exchange rate of the crystallizer. thermal area. In order to further increase the production capacity of the kettle crystallizer, a casing crystallizer with a scraper is usually set outside the kettle crystallizer. The purpose of setting up the sleeve-type crystallizer is to provide more heat exchange ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02C07C15/08C07C7/14
Inventor 陈亮肖剑卢咏琰钟禄平郭艳姿
Owner CHINA PETROLEUM & CHEM CORP
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