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A high-efficiency evaporator for refining adiponitrile and a process for refining adiponitrile

A technology of adiponitrile and evaporator, which is applied in the field of high-efficiency evaporator and adiponitrile refining process to reduce the possibility of gas leakage, prevent liquid entrainment, and prevent back-mixing

Active Publication Date: 2018-11-27
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's adiponitrile mainly relies on imports. With the rapid development of my country's nylon 66 industry in recent years, the demand for adiponitrile has gradually increased. However, as an important raw material for producing nylon 66 salt intermediate hexamethylenediamine, domestic enterprises have no Production capacity is completely dependent on imports

Method used

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  • A high-efficiency evaporator for refining adiponitrile and a process for refining adiponitrile
  • A high-efficiency evaporator for refining adiponitrile and a process for refining adiponitrile
  • A high-efficiency evaporator for refining adiponitrile and a process for refining adiponitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The crude cyanide solution from the two-step cyanidation process of adiponitrile enters the rectifying tower at 50332kg / h. In terms of mass percentage, the tower top contains 75-90% adiponitrile, and the content of by-products is 10-25%. The raffinate content is 0%, and the heavy raffinate content at the bottom of the tower is 100%. The heavy raffinate from the bottom of the rectification tower is separated from solid impurities by coarse filtration equipment, and then enters the high-efficiency evaporator; the operating temperature of the high-efficiency evaporator is controlled at 140-190°C, and the operating pressure is controlled at -99.9kPag-110kPag. Nitrile is recovered from the top of the evaporator, and the resulting heavy raffinate waste liquid enters the heavy raffinate tank;

[0036] The adiponitrile 6254kg / h of 100% purity is recovered at the top of the evaporator by sampling analysis; 1563kg / h of heavy raffinate waste liquid is obtained at the bottom of the ...

Embodiment 2

[0038] The crude cyanide solution from the two-step cyanidation process of adiponitrile enters the rectifying tower at 50332kg / h. In terms of mass percentage, the tower top contains 65-80% adiponitrile, and the content of by-products is 20-35%. The raffinate content is 0%, and the heavy raffinate content at the bottom of the tower is 100%. The heavy raffinate from the bottom of the rectification tower is separated from solid impurities through coarse filtration equipment, and then enters a high-efficiency evaporation system formed by two high-efficiency evaporators connected in series; The pressure is controlled at -99.9kPag ~ 110kPag, the separated adiponitrile is recovered from the top of the evaporator, and the obtained heavy raffinate waste liquid enters the heavy raffinate tank;

[0039] The adiponitrile 5248kg / h of 100% purity was recovered at the top of the last evaporator by sampling analysis; 2632kg / h of heavy raffinate was obtained at the bottom of the evaporator.

Embodiment 3

[0041] The crude cyanide solution from the two-step cyanidation process of adiponitrile enters the rectifying tower at 50332kg / h. In terms of mass percentage, the tower top contains 65-80% adiponitrile, and the content of by-products is 20-35%. The raffinate content is 0%, and the heavy raffinate content at the bottom of the tower is 100%. The heavy raffinate from the bottom of the rectification tower is separated from solid impurities through coarse filtration equipment, and then enters a high-efficiency evaporation system formed by three high-efficiency evaporators in series; The pressure is controlled at -99.9kPag ~ 110kPag, the separated adiponitrile is recovered from the top of the evaporator, and the obtained heavy raffinate waste liquid enters the heavy raffinate tank;

[0042] The adiponitrile 5431kg / h of 100% purity was recovered at the top of the last evaporator by sampling analysis; 2487kg / h of heavy raffinate was obtained at the bottom of the evaporator.

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Abstract

The invention provides an efficient evaporator. An efficient distribution measure combining primary distribution with secondary distribution is adopted at a distribution segment to guarantee the sufficient distribution of heavy raffinate at a heating segment; an efficient collection measure is adopted at the outlet of the heating segment to effectively prevent the back mixing of the heavy raffinate; a defoaming structure is adopted at a separation segment to prevent liquid entrainment; and in addition, the design of the entire evaporator can ensure the operation of the equipment in a high vacuum degree, and the used efficient evaporator involves no transmission component and is static equipment, thereby reducing the air leakage possibility of the transmission component, and thus the high vacuum degree of the evaporator is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology, and in particular relates to an efficient evaporator for refining adiponitrile and a process for refining adiponitrile. Background technique [0002] Adiponitrile (ADN) is a colorless and transparent oily liquid, which is mainly used to reduce hexamethylenediamine, which is neutralized with adipic acid to produce nylon 66 salt, which is the most important product of adiponitrile so far. industrial use. Adiponitrile can also be used in rocket fuel, electroplating industry, washing additives and insecticides. At present, my country's adiponitrile mainly relies on imports. With the rapid development of my country's nylon 66 industry in recent years, the demand for adiponitrile has gradually increased. However, as an important raw material for producing nylon 66 salt intermediate hexamethylenediamine, domestic enterprises have no Production capacity is completely dependent on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/00B01D1/30C07C253/34C07C255/04
CPCB01D1/00B01D1/0011B01D1/0064B01D1/30B01D1/305C07C253/34C07C255/04
Inventor 刘晶闫伟王聪赵敏伟赵丽丽张二涛刘增坤何勇龚剑张梦娣梁军湘李荣杨克俭
Owner CHINA TIANCHEN ENG
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