Process for preparation of highly concentrated free-flowing aqueous solutions of betaines

摘要

The invention relates to a process for the preparation of highly concentrated free-flowing and pumpable aqueous solutions of betaines by quaternization of a compound which contains tertiary amine nitrogen with a omega -halo carboxylic acid characterized in that 0.5-5% by weight of the final product, of a viscosity-reducing compound such as an alkali or alkaline earth metal citric acid salt is added to the reaction mixture before or during the quaternization reaction.