Abstract:

Octadecylmethyldihydroxyethyl ammonium bromide (OMDAB）was synthesized withN-methyldiethanolamine and octadecylbromide as raw materials under microwave condition.It was analyzed quantitatively with two-phase titration and characterized with IR, 1H NMR and elemental analysis.The effects of solvent, microwave power, reaction time, and solvent volume on the conversion rate were studied.The optimal condition obtained through response surface methodology (RSM）is as follows: with hexanol as solvent, solvent volume of 10.7 ml, reaction time of 25 min, and microwave power of 570 W.Under the optimal condition, in a very short reaction time, just 4.63% of the conventional heating time, the conversion can reach 95.30%.The surface tension, Krafft point, CMC and the melting point of the product are determined.

Key words: 新型季铵盐, 微波合成, 结构表征, 响应面法

摘要：

以N-甲基二乙醇胺和溴代十八烷为原料，采用微波合成十八烷基甲基二羟乙基溴化铵（OMDAB）。采用两相滴定法进行定量分析，通过IR、1H NMR及元素分析进行结构表征。研究了溶剂、微波功率、反应时间、溶剂体积对反应物转化率的影响。采用响应面法（RSM）优化的最佳合成条件为：正己醇作溶剂，溶剂体积10.7 ml，反应时间25 min，微波功率570 W。在优化条件下，所需时间仅为传统加热所需时间的4.63%，转化率即可达到95.30%。测定了产品的表面张力、克拉夫点、临界胶束浓度和熔点等性能。

关键词: 新型季铵盐, 微波合成, 结构表征, 响应面法