Method for preparing methanesulfonic acid by recycling byproduct, namely hydrochloric acid

Abstract

The invention relates to a method for preparing methanesulfonic acid by recycling a byproduct, namely hydrochloric acid. The method is characterized in that a method of hydrogen chloride, chlorine gas, methanesulfonic acid and hydrogen chloride is adopted, and the byproduct, namely the hydrochloric acid is recycled in the preparation process of the methanesulfonic acid to prepare the methanesulfonic acid. The method has the advantages that the byproduct, namely the hydrochloric acid is adopted for preparing chlorine gas and directly reacted with dimethyl disulfide, so that the safety risk and the logistics cost in purchase, transportation and storage of the chlorine gas with severe toxicity can be avoided; the byproduct, namely the hydrochloric acid, which is difficult to sell can be locally digested and utilized, and turned into treasure, so that the byproduct, namely the hydrochloric acid becomes a main raw material for preparing the methanesulfonic acid and the recycling of chlorine element is realized. Simultaneously, leftover manganese dioxide waste after oxidation reaction of potassium permanganate is utilized to prepare manganese chloride, and the manganese chloride can be used for electrolytic manganese, so that the production cost and the safety risk of the methanesulfonic acid are greatly reduced, and two major restricting factors, namely the chlorine gas and the byproduct, namely the hydrochloric acid in the preparation method of the methanesulfonic acid are simultaneously eliminated.

Description

technical field

[0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing methanesulfonic acid by recycling by-product hydrochloric acid. Background technique

[0002] Methanesulfonic acid is an important intermediate of organic medicine and pesticide, which is very important in the synthesis of fomesafen and other pesticides and cephalosporins. At the same time, methanesulfonic acid is still the main raw material of the most widely used electronic electroplating. At present, the common method of producing methanesulfonic acid is the hydrolysis process of methanesulfonyl chloride. The process uses dimethyl disulfide and chlorine to carry out wet oxidation to obtain methanesulfonyl chloride, which is hydrolyzed to obtain methanesulfonic acid.

[0003] Among them, the wet oxidation process of methanesulfonyl chloride adopts chlorine gas and dimethyl disulfide in water emulsion to carry out chlorine oxidation reaction. ...