Method for preparing OBSC (4,4'-oxo-bis-benzenesulfonyl chloride) from basic chemical raw materials

Abstract

The invention discloses a method for preparing OBSC (4,4'-oxo-bis-benzenesulfonyl chloride) from basic chemical raw materials, which comprises the following steps: (1) irradiating chlorine gas in light under the catalytic action of iron trichloride to crack into chlorine free radicals; (2) combusting sulfur in air to prepare sulfur dioxide gas; (3) adding diphenyl ether into a reaction kettle, introducing the chlorine gas treated by the step (1) and the sulfur dioxide gas prepared in the step (2) into the reaction kettle, reacting with the diphenyl ether at 55-90 DEG C for 3-5 hours, and reacting at 30-60 DEG C for 2-4 hours; and (4) introducing chlorine gas into the reaction kettle, reacting at 35-50 DEG C, stopping introducing the chlorine gas when the oxidation-reduction potential suddenly increases, and continuing the reaction at 35-50 DEG C for 1-3 hours, thereby obtaining the OBSC. The product prepared by the method has the advantages of lower production cost, high yield, high purity and no generation of waste liquids, and has higher yield and purity than that of the traditional preparation method.

Description

technical field [0001] The invention relates to a method for preparing OBSC with basic chemical raw materials. Background technique [0002] At present, OBSC is used as a raw material to prepare various products such as high, medium and low temperature foaming agents and engineering plastics, which are widely used in the fields of chemical industry, aviation, electrical insulation, etc. It is a key intermediate widely used in high-end plastic and rubber industries . [0003] The traditional process of synthesizing 4,4'-oxobisbenzenesulfonyl chloride (OBSC) is mostly liquid sulfonating agent and chlorinating agent phosphorus oxychloride. For example, most of the current production of OBSC uses chlorosulfonic acid or concentrated sulfuric acid to sulfonate diphenyl ether, which consumes a lot of sulfonating agent raw materials and cannot be recycled, resulting in a lot of waste. A large amount of water will produce a large amount of acidic waste water at the same time, and i...

AI Technical Summary

Problems solved by technology

For example, most of the current production of OBSC uses chlorosulfonic acid or concentrated sulfuric acid to sulfonate diphenyl ether, which consumes a lot of sulfonating agent raw materials and cannot be recycled, resulting in a lot of waste. A large amount of water will produce a large amount of acidic wastewater, and it is easy to cause hydrolysis of the product, resulting in a large number of isomers and sulfoxide by-products, and the product yield and purity are not high

Images