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Method for recycling tail gas of sulfonyl chloride chlorination in Cmoba synthesis

A technology of medium sulfonyl chloride chlorination and tail gas recycling, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high equipment requirements and high energy consumption, achieve mild process conditions, simple equipment, and reduce The effect of emissions

Inactive Publication Date: 2013-05-22
SHANDONG JINCHENG KERUI CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has high energy consumption and high requirements on equipment

Method used

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  • Method for recycling tail gas of sulfonyl chloride chlorination in Cmoba synthesis
  • Method for recycling tail gas of sulfonyl chloride chlorination in Cmoba synthesis
  • Method for recycling tail gas of sulfonyl chloride chlorination in Cmoba synthesis

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Effect test

Embodiment 1

[0021] The tail gas derived from the Cmoba chlorination acid hydrolysis process contains about 45% hydrogen chloride, which is absorbed by primary and secondary water. The temperature of the absorption liquid is 30 °C. The hydrogen chloride removal rate of the primary absorption product is 96%, and hydrochloric acid with a concentration of 20% can be obtained, which is completely suitable for the Cmoba alkylation process.

Embodiment 2

[0023] The gas drawn out after the secondary absorption is mainly 92% sulfur dioxide tail gas, which is absorbed by the two-stage ammonia water. °C, the removal rate of sulfur dioxide is 98%, and a mixed solution of sodium bisulfite and sodium sulfite with a specific gravity of 1.3g / ml can be obtained, which can be used as a reducing agent after concentration.

Embodiment 3

[0025] The tail gas drawn from the Cmoba chlorinated acid hydrolysis process contains about 50% hydrogen chloride, which is absorbed by primary and secondary water. The temperature of the absorption liquid is 25°C. The first-stage absorption product has a hydrogen chloride removal rate of 96%, and hydrochloric acid with a concentration of 20% can be obtained. After desulfurization treatment, it is concentrated to industrial hydrochloric acid with a concentration of 31%, which can be sold or used in other processes that require the use of industrial hydrochloric acid.

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Abstract

The invention relates to a method for recycling tail gas of sulfonyl chloride chlorination in Cmoba synthesis, and belongs to the tail gas absorption and treatment in the chemical field. The method is characterized by comprising the following steps: gaining sulfur dioxide and hydrogen chloride which are generated in the reaction; carrying out two-stage absorption on the hydrogen chloride by water to obtain the hydrochloric acid containing little sulfur dioxide, wherein the hydrochloric acid containing little sulfur dioxide is utilized in the alkylation step of the Cmoba preparation process; carrying out two-stage absorption on the rest sulfur dioxide through ammonia water to prepare the mixed solution of ammonium hydrogen sulfite and ammonium sulfite; and concentrating the obtained ammonium salt solution which is directly used as a reducing agent. By adopting the method, the gases, namely, hydrogen chloride and the sulfur dioxide, produced in the Cmoba chlorination process can be effectively recycled, so that the emission of harmful tail gas can be reduced, and the volume of drained wastewater in the Cmoba alkylation process is also reduced; simultaneously, the mixed solution of the byproducts, namely, ammonium hydrogen sulfite and ammonium sulfite, is used as the reducing agent which is in a good market prospect; and the method is simple in equipment, mild in technological condition and convenient to operate.

Description

technical field [0001] The invention relates to a tail gas recycling method for sulfonyl chloride chlorination reaction in Cmoba synthesis, which belongs to tail gas absorption treatment in the field of chemical industry. Background technique [0002] Cmoba is an important intermediate in the preparation process of the cephalosporin antibiotic cefixime. In terms of its preparation method, many synthetic methods used in China now have the following reaction formula characteristics: [0003] [0004] This process produces a large amount of sulfur dioxide and hydrogen chloride mixed gas when using sulfuryl chloride for acylation. In the treatment and recycling of similar mixed gases, the patent CN101412526A discloses a method for producing sodium sulfite from the tail gas of thionyl chloride synthesis. The method is to pass the mixed gas through primary absorption first, the absorption liquid is water or dilute hydrochloric acid, the product discharged from the primary absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/68B01D53/50
Inventor 孙滨郭方水王辉
Owner SHANDONG JINCHENG KERUI CHEMICAL CO LTD
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