Study on the improvement of synthetic craft of dicyclohexyl phthalate

In this paper,dicyclohexyl phthalate was prepared f ro m phthalic anhydride and cyclohexanol by the methods of esterification,distillat ion and crystallization.The optimum conditions are as follows:the ratio of phtha lic anhydride to cyclohexanol is 1∶(2.3～2.5),the amount of catalyst i s 0.9% of the amount of phthalic anhydride,reaction temperature is ranged from 1 20℃ to 200℃,reaction time is about 7 h and 95% ethanol is used as the solvent of crystallization.Results shows that neutralization can be leaved out on condit ion that the esterification is on good control,and DCHP with high quality can be got by crystallization which can wipe off most impurities.