Patent ID: 9440915
Filing Date: 2016-09-13
CPC Classification: C07C

Claim Text:
1. A method for preparing methanedisulfonic acid, comprising an acidification, wherein the acidification comprises subjecting a methanedisulfonate to reacting with an acidifier to form a precipitate of a salt of the acidifier and obtain a mixture containing methanedisulfonic acid, wherein the methanedisulfonate is one or a mixture of two or more selected from a group consisting of calcium methanedisulfonate, barium methanedisulfonate, ferrous methanedisulfonate, ferric methanedisulfonate, silver methanedisulfonate and lead methanedisulfonate, and wherein the acidifier is one or a mixture of two or more selected from a group consisting of sulfuric acid, phosphoric acid, methane sulfonic acid and hydrochloric acid.