Method for inhibiting generation of chlorosulfuric acid in thionyl chloride preparation process

Abstract

The invention relates to a method for inhibiting generation of chlorosulfuric acid in a thionyl chloride preparation process. The method comprises the following steps: feeding a raw material gas mixture prepared from sulfur dioxide, sulfur dichloride and chlorine to a catalytic reactor after pre-heating, and reacting to obtain thionyl chloride; and preheating the gas mixture to 120-180 DEG C. Chlorosulfuric acid in a crude product thionyl chloride is inhibited within 1% from 2%, so that the quality of the crude product thionyl chloride is greatly improved; reduction of the content of chlorosulfuric acid in subsequent refined products is facilitated; and the generation condition through chlorosulfuric acid is avoided.

Description

technical field [0001] The invention belongs to the field of chemical technology production, and in particular relates to a method for inhibiting the formation of sulfuryl chloride in the preparation process of thionyl chloride. technical background [0002] At present, most domestic thionyl chloride production enterprises adopt the sulfur dioxide gas phase method, and sulfuryl chloride is inevitably produced in the process of producing thionyl chloride by this method. Since the boiling point of thionyl chloride (78.8°C) is very close to the boiling point of sulfuryl chloride (69°C), it is difficult to completely separate thionyl chloride and sulfuryl chloride by conventional rectification methods, resulting in a high content of sulfuryl chloride in the product, seriously affecting product quality . [0003] Aiming at the problem of sulfuryl chloride in thionyl chloride: patent US2529671 proposes a method for removing impurities in thionyl chloride with organic solvents; pa...

AI Technical Summary

Problems solved by technology

Since the boiling point of thionyl chloride (78.8°C) is very close to the boiling point of sulfuryl chloride (69°C), it is difficult to completely separate thionyl chloride and sulfuryl chloride by conventional rectification methods, resulting in high sulfuryl chloride content in the product, which seriously affects product quality.

[0003] Aiming at the problem of sulfuryl chloride in thionyl chloride: patent US2529671 proposes a method for removing impurities in thionyl chloride with organic solvents; patent US4337235 decomposes sulfuryl chloride by adding sulfur and catalyst aluminum trichloride; patent CN103172031 proposes removing sulfur by activated carbon cracking Acyl chlorides, the above methods are either easy to bring in impurities, or increase equipment investment and energy consumption levels, bringing unnecessary problems to industrial production