ETHANOLAMINE SYNTHESIS METHOD Russian patent published in 2011 - IPC C07C213/04 C07C215/08 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing a mixture of ethanolamines with predominant content of diethanolamine from ammonia and ethylene oxide in the presence of water. The process is carried out in a displacement reactor with ratio of ammonia to ethylene oxide equal to 2.9-3.3:1, at temperature 40-80°C while recycling monoethanol amine at atmospheric pressure in the presence of CO₂, which is added simultaneously with aqueous ammonium solution, with content of CO₂ in the aqueous ammonium solution equal to 40-80 g/l, with subsequent distillation and return of ammonia, CO₂ and water into the reactor. Monoethanol amine is recycled in the zone of the displacement reactor with 60-80% conversion of ethylene oxide.

EFFECT: method increases specific output of the reactor unit and diethanol amine selectivity.

10 ex,1 tbl