Study on the synthesis of Diethylene Glycol Dibenzoate on Cs_(2.5) H_(0.5)PW_(12)O_(40) /SiO_2 Catalyst

The supported acid cesium salts of 12-tungstophosphoric on silica carrier (Cs 2.5 H 0.5 PW 12 O 40 /SiO 2)were prepared, and used to catalyze the synthesis of diethylene glycol dibenzoate(DEDB). Effects of preparation conditions on the catalytic performance of the catalyst and reaction conditions on the esterification of diethylene glycol with benzoic acid were investigated. The most suitable conditions for the reaction are as follows: n(benzoic acid)/ n(diethylene glycol)=2.2?catalyst 0.7 %?reaction temperature 180 ℃?reaction time 4 h?discharge of carrier N 2 of water 250 mL/min. Under the conditions, the esterification was up to 99.67 %?The reuse test showed that the catalyst had higher catalytic cativity and stability.