Sodium N - lauroyl - N - methyl taurine was synthesized by one step direct condensation lauric acid with sodium N - methyl taurine as the main starting materials. The effects of reaction temperature, reaction time, catalyst type and dosage, molar ratio of starting materials and solvent dosage on the reaction were investigated. Results showed that the optimal process is;molar ratio of lauric acid to sodium N - methyl taurine 1. 3: 1 ;boric acid as the catalyst with dosage of 2% of lauric acid mass;dosage of solvent 40% of lauric acid mass; reaction time 6 h at 215 ℃ Over 95% conversion of sodium N - methyl taurine is achieved under the optimal process. Purity of product achieves more than 98% after recrystallization and drying operation of the crude product.%以月桂酸和N-甲基牛磺酸钠为原料,经直接缩合一步反应合成了月桂酰基甲基牛磺酸钠.考察了直接法缩合工艺中反应温度、反应时间、催化剂种类和用量、投料比、溶剂用量等对反应的影响.结果表明,优化反应条件为:月桂酸与N-甲基牛磺酸钠投料摩尔比为1.3∶1,催化剂硼酸用量为月桂酸质量的2％,溶剂用量为月桂酸质量的40％,215℃反应6h.在上述条件下,N-甲基牛磺酸钠的转化率可达95％以上,粗产品经重结晶及干燥处理后纯度可达98％以上.
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