Patent ID: 9593076
Date: 2017-03-14
CPC Classifications: C07C

Claim:
1. A cyclic process for producing taurine from alkali isethionate, comprising: (a) adding one or a combination of two or more catalysts to an ammonia solution of a mixture of alkali isethionate, alkali ditaurinate, and alkali tritaurinate, and subjecting the solution of to ammonolysis reaction to yield a mixture of alkali taurinate, alkali ditaurinate, and alkali tritaurinate; (b) removing excess ammonia and neutralizing with isethionic acid to obtain a crystalline suspension of taurine in a solution of alkali isethionate, alkali ditaurinate, and alkali tritaurinate; (c) separating taurine by means of solid-liquid separation; and (d) returning the mother liquor of (c) to step (a) for further ammonolysis.