Preparation method of taurine

The invention discloses a taurine preparation method, which comprises: (1) in the presence of an ammonia water complex ion catalyst, carrying out an ammonolysis reaction on a sodium isethionate aqueous solution and ammonia to obtain a reaction solution containing sodium taurate; (2) performing deamination, concentration and water removal, acidification and crystallization on the reaction liquid containing sodium taurate to obtain taurine and mother liquor; the ammonia water complexing ion catalyst is obtained by complexing ammonia and a catalyst precursor, and the catalyst precursor contains one or more metal elements of chromium, zinc, nickel, cobalt, copper and silver. The method has the advantages of mild process conditions, short reaction time, high yield, simple catalyst source and the like. 本发明公开了一种牛磺酸的制备方法，包括：(1)在氨水络合离子催化剂存在下，羟乙基磺酸钠水溶液和氨进行氨解反应，得到含牛磺酸钠的反应液；(2)含牛磺酸钠的反应液经过脱氨、浓缩除水、酸化和结晶得到所述牛磺酸和母液；所述的氨水络合离子催化剂由氨与催化剂前驱体络合得到，所述的催化剂前驱体中含有铬、锌、镍、钴、铜、银中的一种或者多种金属元素。该方法具有工艺条件温和、反应时间短、收率高，且催化剂来源简单等优势。