PREPARATION OF COCOAMIDOALKYLBETAINE WITH GOOD COLOR QUALITY COLOR STABILITY AND COLOR DURABILITY AND AMPHOTERIC SURFACTANT CONTAINING THE SAME

摘要

According to the present invention, cocoamic acid is amidated with dimethylaminopropylamine in the presence of a catalyst selected from boron-based compounds, pretreated with a reducing agent selected from boron-based compounds after washing and drying, followed by 4 with sodium monochloroacetate. The method for preparing dimethylaminopropyl betaine having a good color quality, color stability, and color durability with low content of unreacted impurities and side reaction impurities is provided, and an amphoteric surfactant comprising the same.