Method for synthesizing erucamide propyl betaine

• Main Authors: HE ZUHUI, ZHU JIN, FENG ZIWEI, FENG MINGKE, LIU YONG
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2012
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention discloses a method for synthesizing erucamide propyl betaine, relating to a method for manufacturing viscoelastic surfactants. The method for synthesizing the erucamide propyl betaine comprises the steps of carrying out a condensation reaction, a reduced pressure distillation reaction and a quaternary amination reaction and comprises the concrete steps of firstly putting erucic acid, dimethylamino propylamine and a catalyst in a reaction kettle and reacting for 6-10 hours at a temperature of 140-200 DEG C; keeping the temperature and carrying out reduced pressure distillation for 30-60 minutes and vacuumizing to 600-650mHg; neutralizing the erucic acid by using dilute alkaline water and rinsing till to be neutral; and adding a sodium chloroacetate aqueous solution into a mixed solvent of intermediate tertiary amine and carrying out the quaternary amination reaction for 4-8 hours at a temperature of 60-90 DEG C, wherein, finally, the tertiary amine conversion rate is up to more than 98% and the c