Method and system for recycling by-product hydrogen chloride in the chlorination production process of fatty acid or fatty acid chloride

A technology for the production process of fatty acid chlorides, which is applied in the field of recycling hydrogen chloride by-products in the chlorination production process of fatty acids or fatty acid chlorides, and can solve the problems of cumbersome operations and high equipment investment costs

Active Publication Date: 2018-05-18
NANTONG TIANSHI CHEM
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  • Claims
  • Application Information

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Problems solved by technology

Literature (Chen Xian et al., Process Engineering Journal, 2007, 7 (5): 939-943; CN101070140, 2007-11-14.) has reported the hydrogen chloride oxidation reaction through the dehydration coupling process of multi-section reactor series, the hydrogen chloride oxidation reaction gas It is used in the chlorination reaction of toluene, but the process method of multiple oxidation reactors in series used in the literature has the disadvantages of cumbersome operation and high equipment investment cost.

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  • Method and system for recycling by-product hydrogen chloride in the chlorination production process of fatty acid or fatty acid chloride

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Embodiment 1

[0037] at 5m 3 Add 3000kg of fresh acetic acid in the first chlorination reaction kettle, add 100kg mass fraction simultaneously and be the concentrated sulfuric acid of 98.3% as catalyst, at 30 ℃, open the first valve, close the second valve, in the first chlorination reaction kettle Feed into 160kg / h fresh chlorine, carry out chlorination reaction, when the transformation rate of acetic acid in the first chlorination reactor reaches about 97%, the massfraction of chloroacetic acid in the reaction liquid is about 94.1wt% this moment, the dichloroacetic acid The mass fraction is about 3.5wt%, and the unreacted acetic acid mass fraction is about 2.4wt%. With the mass flow rate of 222.2kg / h, fresh acetic acid is continuously passed in the first chlorination reaction kettle, and the concentrated sulfuric acid catalyst is added in the chlorination reaction kettle with the mass flow rate of 7.4kg / h, and with the mass flow rate of 229.6kg / h The flow rate continuously takes out the ...

Embodiment 2

[0043] 5m between 2 sets 3Add 3000kg of fresh acetyl chloride in the chlorination reactor, and add 150kg of concentrated sulfuric acid at the same time, at 30°C, open the first valve, close the second valve, and feed 162.3kg / h of fresh chlorine into the first chlorination reactor. The chlorination reaction is carried out. The chlorination reaction kettle is connected with a -30°C graphite refrigeration heat exchanger, and at the same time, a by-product hydrogen chloride waste gas containing a large amount of organic impurities is produced. The hydrogen chloride waste gas is absorbed and purified, catalytically oxidized, and frozen to remove water. Return to the first chlorination reactor for catalytic chlorination of fatty acid or its acyl chloride. When the conversion rate of acetyl chloride in the first chlorination reactor reaches about 98.5%, the mass fraction of unreacted acetyl chloride in the reaction solution is about 1.3% wt%, the mass fraction of chloroacetyl chlorid...

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Abstract

The invention discloses a method for recycling the by-product hydrogen chloride in the fatty acid or fatty acyl chloride chlorination production process. The method includes the steps that the by-product hydrogen chloride waste gas generated in a chlorination reaction of fatty acid or acyl chloride thereof is introduced into a hydrogen chloride purification tower from the lower portion of the hydrogen chloride purification tower and makes countercurrent contact with absorption liquid in the hydrogen chloride purification tower, and organic impurities in the hydrogen chloride waste gas are adsorbed and removed with the absorption liquid; the hydrogen chloride waste gas obtained after absorption purification and oxygen are subjected to a catalytic oxidation reaction under the action of an oxidation catalyst; mixed gas obtained after the oxidation reaction of hydrogen chloride passes through chilled brine, and the mixed gas obtained after chilled dehydration is subjected to catalytic chlorination with fresh chlorine and fatty acid or acyl chloride thereof directly so as to produce chlorinated aromatic hydrocarbons; the hydrogen chloride waste gas containing organic impurities enters the hydrogen chloride purification tower from the lower portion of the hydrogen chloride purification tower to be subjected to absorption purification again. By means of the method, the tedious processes of conducting compression chilling and the like for separating oxygen after hydrogen chloride is oxidized are omitted, the technological route is shortened, and the equipment investment cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of chlorine resource recycling, and relates to a method and system for recycling hydrogen chloride by-products in the chlorination production process of fatty acids or fatty acid chlorides, in particular to a purified hydrogen chloride gas produced by chlorination of fatty acids or fatty acid chlorides , and then catalyze oxidation to prepare chlorine gas, and the chlorine gas obtained by oxidation is recycled to be used in the chlorine resource recycling method of fatty acid or fatty acid chloride chlorination production. Background technique [0002] With the expansion of the production capacity of organic chlorine products, a large amount of by-product hydrogen chloride gas cannot be processed, which has become a bottleneck problem for the sustainable development of chlorine-related enterprises. How to digest and utilize the by-product hydrogen chloride has gradually become a common feature that the chlorine-related...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/07C07C51/60C07C51/62
CPCC01B7/0706C07C51/60C07C51/62C07C53/40C07C53/48
Inventor 陈献乔旭楼家伟费兆阳崔咪芬汤吉海
Owner NANTONG TIANSHI CHEM
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