| 摘要 |
<p>A method of preparing tetraacetylethylenediamine, belongs to the Field of preparing technology of bleaching activator in detergent. First reaction of ethylene diamine with acetic acid to synthesize diacetyl ethylenediamine, then reacted with acetic anhydride to synthesize tetraacetylethyl enediamine. The invention is characterized by adding solvent which can be azeotropic with acetic acid but no side reaction with acetic acid and acetic anhydride during synthesis, meanwhile adding catalyst in both two step reactions. In first step reaction adding ethylene diamine to acetic acid solution below 80 ºC, then warming-up, refluxing and dewatering; the temperature of the second step reaction does not exceed 132 ºC. Both filtrates of two step reactions can be recycled, so it is beneficial to improve the purity of product and decrease the consumption of raw material and energy. Tetraacetylethylenediamine prepared according to the invention is white in appearance, purity > 99 %, and adoption of the invention has significant benefit.</p> |
