Process for recovery of amine oxide salts

摘要

A process for recovering an amine oxide (in salt form) from an aqueous solution comprises treating a solution of the oxide with an acid that is (a) a non-substituted aromatic sulphonic acid or an alkyl-substituted aromatic sulphonic acid, the alkyl substituent group(s) of which contain(s) from 1 to 20 carbon atoms, or (b) an aliphatic sulphonic acid containing from 10 to 20 carbon atoms, or (c) a fatty alcohol half-ester of sulphuric acid having from 10 to 20 carbon atoms, to form a salt of said oxide, and extracting the salt from the solution with a water-immiscible, polar organic compound that is a solvent for, but non-reactive with, the salt. The invention also comprises salts of amine oxides of tertiary amines of the formula in which R1 and R2 are each methyl or ethyl radicals and R3 is an alkyl radical having from 8 to 20 carbon atoms, with acids of types (a), (b) and (c) above. Examples are given. Specification 989,420 is referred to.