Crystallization method with overflow of clear mother liquor

A technology of crystallization and overflow, applied in the direction of solution crystallization, etc., can solve the problems of small crystal particle size, frequent crystallizer cleaning, etc., 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 that the existing crystallization method has small crystal particle size and frequent cleaning of the crystallizer, and a novel crystallization method with clear mother liquor overflow is provided

Method used

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  • Crystallization method with overflow of clear mother liquor
  • Crystallization method with overflow of clear mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The crystallization method of belt clear mother liquor overflow of the present invention produces p-xylene

[0027] Such as figure 2Said, 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 crystal clear mother liquor 11 in the kettle crystallizer 2 is discharged from the upper part of the crystallizer. 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 ...

Embodiment 2

[0029] The crystallization method of belt clear mother liquor overflow of the present invention produces p-xylene

[0030] use as image 3 The crystallization method with the overflow of the clear mother liquor, wherein the mixed xylene raw material 1 is mixed with the second stream of crystallization and filtration mother liquor 8 and a part of the magma 9 in the tank crystallizer and then enters the casing type crystallizer 10, and crystallizes Clear mother liquor 11 is 0.5: 1 with the weight ratio of crystallization and filtration mother liquor 7, and solid-liquid separator 4 is a crystal washing tower, and p-xylene crystal 5 is discharged as product after being washed with pure toluene, and all the other operating conditions are identical with embodiment 1, The results are listed in Table 1.

[0031] Table 1

[0032]

Embodiment 3

[0037] The crystallization method of belt clear mother liquor overflow of the present invention produces p-xylene

[0038] use as figure 2 The crystallization method with overflow of clear mother liquor, wherein the sleeve-type crystallizer 10 is composed of a tubular heat exchanger with a scraper, the operating temperature is -17.5°C, and the remaining operating conditions are the same as in Example 1, and The results are listed in Table 2.

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Abstract

The invention relates to a crystallization method with an overflow of a clear mother liquor, mainly solving the problems of small crystal size and frequent cleaning of the crystallizer existing in the prior art. The invention is characterized in that: raw material enters in a kettle-type crystallizer for crystallization; crystallized clear mother liquor in the kettle-type crystallizer flows out from the upper portion of the crystallizer; the crystal mush in the kettle-type crystallizer is divided into two parts- crystal mush I and crystal mush II, which flow out from the lower portion of the crystallizer; the crystal mush I is subject to separation through a solid-liquid separator to obtain crystals and crystallized filtrated mother liquor, the crystal mush II is subject to heat transfer through a jacketed crystallizer and returns to the kettle-type crystallizer, wherein, the weight ratio of the crystal mush I to the crystal mush II is 1:1-1:50; the crystals are discharged as products; the crystallized filtrated mother liquor is divided into two streams, the crystallized filtrated mother liquor I accounting for 5-95 wt% of the crystallized filtrated mother liquor is discharged, the crystallized filtrated mother liquor II accounting for 5-95 wt% of the crystallized filtrated mother liquor is mixed with the crystal mush II and then returns to the kettle-type crystallizer; raw material enters in the kettle-type crystallizer after mixing with the crystal mush II or directly enters in the kettle-type crystallizer, and the weight ratio of the crystallized mother liquor to the crystallized filtrated mother liquor I is 0.1:1-10:1. The invention can be applied in the industrial crystallization production.

Description

technical field [0001] The invention relates to a crystallization method with clear mother liquor overflowing. 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 exchang...

Claims

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Application Information

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