| 摘要 |
Disclosed is a method for cyclically preparing taurine from a hydroxyethyl sulfonic acid alkali metal salt and a vinyl sulfonic acid alkali metal salt. In the method, by-products of an ammonolysis reaction, i.e., disodium taurate and trisodium taurate, are continuously converted into sodium taurate, so as to achieve efficient production with an overall yield over 95%. Pure disodium taurate and trisodium taurate are prepared by using diethanolamine and triethanolamine as raw materials and separately subjecting them to an ammonolysis reaction to obtain a mixture of sodium taurate, disodium taurate and trisodium taurate. |
