Sulfur putting method in thionyl chloride refining process

Abstract

The invention relates to a method for adding sulfur in the refining process of thionyl chloride. The water and impurities in the sulfur are removed through sulfur selection, pulverization, feeding, heating and melting sulfur, filtration of crude sulfur, and thionyl chloride refining and batching. The reaction of water and thionyl chloride to generate waste gas can be avoided, and the precision of the product can be improved at the same time, and the invention has the advantages of simple process operation, high precision of the finished product, resource saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of refining thionyl chloride, and in particular relates to a sulfur feeding method in the refining process of thionyl chloride. Background technique [0002] Thionyl chloride (SOCl2) is an important fine chemical product and an intermediate in the synthesis of many chemicals. Because it has strong chlorination and acid chlorination capabilities, it can significantly improve the utilization of some expensive raw materials; as chlorine Chlorination reagents and acyl chloride reagents, thionyl chloride is mainly used in pesticides, medicines, dyes and other industries; it can also be used as a chlorination agent for the synthesis or replacement of alcohols, acid anhydrides, and nitro compounds, and can also be used in ring-closing reactions Chloroacylating agents synthesized from compounds such as thiazoline, pyrrolidine, and amides, and catalysts in some organic synthesis reactions, etc., also use a large amou...

AI Technical Summary

Problems solved by technology

[0002] Thionyl chloride (SOCl2) is an important fine chemical product and an intermediate in the synthesis of many chemicals. Because it has strong chlorination and acid chlorination capabilities, it can significantly improve the utilization of some expensive raw materials; as chlorine Thionyl chloride is mainly used in pesticides, medicines, dyes and other industries; it can also be used as a chlorination agent for the synthesis or replacement of alcohols, acid anhydrides, and nitro compounds, and it can also be used in ring-closing reactions Chloroacylating agents synthesized from compounds such as thiazoline, pyrrolidine, and amides, and catalysts in some organic synthesis reactions, etc., also use a large amount of thionyl chloride in the production of high-energy batteries; at present, in the traditional production process of thionyl chloride, Before sulfur oxychloride is refined into finished products, sulfur must be added to react in order to reduce low-sulfur content, and then distilled into finished products. During the sulfur addition process, block sulfur is directly added to the crude product, because sulfur contains water , water and thionyl chloride react to generate waste gas, which not only wastes thionyl chloride, but also causes environmental pollution