Process for recovering anhydrous alkanesulfonic acids by reduced pressure, falling film evaporation

摘要

Water is removed from methanesulfonic acid to produce an anhydrous product of high purity by spraying wet methanesulfonic acid (MSA) onto the walls of a vertical, heated tube which is maintained at reduced pressure. The water evaporates as the acid flows down the walls of the tube and dry MSA is removed at the bottom.