| 摘要 |
FIELD: organic chemistry, detergents. ^ SUBSTANCE: claimed method includes interaction of ethylene diamine with tetraacetic acid. Obtained reaction mixture is treated with acetic anhydride at elevated temperature and N,N,N',N'-tetraacetylethylene diamine is isolated from reaction mass by crystallization. Reagent interaction is carried out in system of two continuous reactors acting in mixing-displacement regime at continuous raw material feeding such as ethylene diamine into top of the first reactor and acetic anhydride into top of the second reactor. Molar ratio of fresh acetic anhydride to ethylene diamine is 2.05-2.1. Temperature difference between top and bottom parts is maintained from 20 to 30C for the first reactor and from 20 to 40C for the second one. Compound of present invention is useful in detergent compositions. ^ EFFECT: target product of increased yield and purity, simplified process. ^ 1 dwg, 1 tbl, 8 ex |
