Crystalline percarboxylic acids prepn. from carboxylic acids - by hydrogen peroxide oxidn. in presence of water immiscible solvent

摘要

Prepn. of a crystalline percarboxylic acid comprises oxidising with H2O2 in the presence of a strong acid, a carboxylic acid contained in an aq. phase in which is intimately dispersed an inert water-immiscible solvent. The catalyst pref. has a pKa of at least 0.7, specifically sulphuric acid, p-toluenesulphonic acid, oleum, trifluoromethanesulphonic acid and methanesulphonic acid. Carboxylic acids are pref. long chain, aromatic or dicarboxylic acids. Specified are dodecanedioic, azelaic, sebacic, tetradecarnediois, and palmitic acids. Specified inert solvents are (o-di)chlorobenzene, chloroform, CCl4, (m)ethylene chloride, 1,2-dichloroethane, 1,1,2-tetrachloroethane and trichloro-trifluoroethane. Percarboxylic acids are used as oxidising agents, bleaching agents, disinfectants, and catalysts, esp. in treating textiles and domestic bleaching. The process is fast, easily controlled and safe. Safety problems of previous processes are avoided and plant effluent costs are reduced.