by the ammonolysis of alkali isethionate in the presence of alkali ditaurinate or alkali tritaurinate or their mixture to inhibit the formation of byproducts and to continuously convert the byproducts of the ammonolysis reaction to alkali taurinate alkali taurinate is reacted with ammonium isethionate to obtain taurine and to regenerate alkali isethionate the production yield is increased to from 90 to nearly quantitative the ammonolysis reaction is catalyzed by alkali salts of hydroxide sulfate sulfite phosphate or carbonate application_number US 201615366798 A description the present invention relates to a cyclic process for the production of taurine from ammonium isethionate in a high overall yield of greater than 90 to nearly quantitative without generating any inorganic salt as byproduct the starting material ammonium isethionate is produced by reacting ethylene oxide with ammonium bisulfite according to the following equation ammonium isethionate produced in a solution can be used directly for the production of taurine preferably ammonium isethionate is purified by concentrating the solution to obtain crystalline materials when solid ammonium isethionate is used in the production of taurine the quality of taurine produced is improved and almost no purge of mother liquor is required from the cyclic process the process according to the present invention starts with mixing a solution of alkali isethionate or regenerated alkali isethionate alkali ditaurinate and alkali tritaurinate with an excess of ammonia the presence of alkali ditaurinate.