酯交换法合成邻苯二甲酸二环己酯

Synthesis of Dicyclohexyl Phthalate by Transesterification

研究了以邻苯二甲酸二甲酯和环己醇为原料,有机锡为催化剂,通过酯交换法在无溶剂的条件下催化合成了邻苯二甲酸二环己酯。通过试验考察了催化剂及用量、反应温度、反应时间及物料配比等因素对反应的影响。结果表明:当邻苯二甲酸二甲酯为0 2mol,环己醇为0 44mol,催化剂有机锡为1 4g,反应时间为5h,反应温度为140℃～150℃时,邻苯二甲酸二环己酯的收率为93 5%,产品熔点为63℃～65℃。通过元素分析、红外光谱分析、核磁氢谱对产品进行了结构表征。

Dicyclohexyl phthalate was prepared without solvent by transesterifying di-methyl-o-phthalate with cyclohexanol in the presence of organic-tin as a catalyst.The effects of catalyst and its amount,temperature,reaction time and molar ratio of the raw material on the reaction were studied.The experimental results show the yield of dicyclohexyl phthalate can be 93.5% when di-methyl-o-phthalate is 0.2 mol,cyclohexanol is 0.44 mol,catalyst amount is 1.4 g,reaction time is 5 h,and reaction temperature is ranged from 140 ℃ to 150 ℃.The melting point of the product is 63 ℃—65 ℃.Elemental analysis,IR and ()~1HNMR were performed to characterize the structure of the product.