PROCESS FOR THE SEPARATION OF MONOETHANOLAMINE DIETHANOLAMINE AND TRIETHANOLAMINE FROM CRUDE ETHANOLAMINE MIXTURES

摘要

1387573 Separating ethanolamines SOC ITALIANA RESINE SIR SpA 16 July 1973 [20 Sept 1972] 33794/73 Heading C2C A crude mixture of ethanolamines containing ammonia and obtained by reacting aqueous ammonia and ethylene oxide is separated into its component parts by feeding it via line 5 to an intermediate point of a distillation column 1 from which monoethanolamine is removed at the top, a mixture of diethanolamine and triethanolamine in removed at the bottom and a mixture of ethylene glycol and monoethanolamine is removed from an intermediate point via line 8. Part of the side streams from line 8 are recycled via line 11 whilst the rest is reacted with ethylene oxide in a reactor 2. The resulting mixture of diethanolamine, triethanolamine and ethylene glycol is fed to an intermediate point of a distillation column 3 from which ethylene glycol is removed at the top and a mixture of diethanolamine and triethanolamine is removed at the bottom. The combined bottom stream from columns 1 and 2 are fed to an intermediate point of a distillation column 4 from which diethanolamine is removed at the top whilst triethanolamine is removed at the bottom.