Process for preparing high-purity methylsulfonic acid

Abstract

The invention discloses a process for preparing high-purity methylsulfonic acid. The process comprises the following steps: generating methylsulfonic sodium in a mixed reactor by the reaction of a sodium sulfite solution and monochloro methane at the temperature of 70-110 DEG C, then adding concentrated hydrochloric acid after dewatering, and generating a methylsulfonic acid solution and a corresponding sodium chloride salt precipitate; distilling off a hydrochloric acid solution from filtrate obtained after filtering sodium chloride salt, then distilling off acid water by depressurization, decompressing and distilling to obtain the methylsulfonic acid with high yield and high purity. The filtered salt sodium chloride can be used as a raw material for industrial electroanalysis, all the water which is distilled out is recovered as an assistant material, and the recovered hydrochloric acid solution is recovered for circular mechanical application. The invention has no pungent odor, no generation of waste water and waste residues, single reaction, easy acquirement of raw materials, simple operation and low cost, is suitable for industrialized scale production and is an environment-friendly industrialized process for preparing the high-purity methylsulfonic acid.

Description

field of invention

[0001] The invention belongs to the technical field of organic chemistry industry, and in particular relates to a process for preparing high-purity methanesulfonic acid. Background technique

[0002] In recent years, methanesulfonic acid has shown its unique use in the preparation of circuit boards of electronic products, and its application in the electroplating industry has become more and more extensive. The reports on the application of methanesulfonic acid and its salt system in electroplating are increasing year by year, and the market is increasing year by year. Methanesulfonic acid and its salts have unique uses as the main salt in brush plating copper, zinc, tin and cadmium plating. For example, copper methanesulfonate has two types in brush plating copper plating solution , that is, acid high-speed copper and high-accumulation alkali copper, which have excellent performance and a wide range of uses, which cannot be compared with other copper sal...