MA Kai, LIU Shaoying, LI Jianguo, et al. Coupling reaction of dimethyl succinate and ethylene carbonate over zinc oxide[J]. CIESC Journal, 2012, (11): 3525-3530.
MA Kai, LIU Shaoying, LI Jianguo, et al. Coupling reaction of dimethyl succinate and ethylene carbonate over zinc oxide[J]. CIESC Journal, 2012, (11): 3525-3530.DOI: 10.3969/j.issn.0438-1157.2012.11.021.
A new technology of synthesis of poly(ethylene glycol succinate)(PES)oligomers and dimethyl carbonate(DMC)by coupling reaction of ethylene carbonate(EC)and dimethyl succinate(DMSu)over ZnO was studied.The effect of calcination temperature of ZnO catalysts on catalytic activity was investigated and ZnO catalysts were characterized with XRD
BET and NH3-TPD.PES oligomers were characterized with FTIR and 1H NMR.The preferable reaction conditions were as follows:reaction temperature 225-235℃
molar ratio of EC to DMSu 2
molar ratio of catalyst to the total mass of EC and DMSu 0.005
reaction time 3 h.Under these conditions
the yield of DMC was 59.7%
the intrinsic viscosity of PES oligomer was 0.3857dl·g-1.The catalytic activity of coupling reaction was affected possibly by the degree of crystallization and the weak acid sites on the surface of ZnO.