Liang Guangxing
2004
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Journal
Chinese Journal of Catalysis
Abstract
The organic carbonates synthesized by oxidative carbonylation are all symmetrical up to now, and asymmetrical organic carbonates are synthesized through transesterification. An asymmetrical dialkyl carbonate, methyl ethyl carbonate (MEC), was synthesized through the oxidative carbonylation of methanol and ethanol catalyzed by CuCl coordinated with two kinds of organic N-donor ligands, 1,10-phenanthroline (phen) andN-methylimidazole (NMI). The effects of volume ratio of methanol to ethanol, molar ratio of phen to NMI, temperature and pressure on the conversion of methanol and ethanol, and the yield of MEC were investigated. The CuCl/phen/NMI catalyst has a higher activity in the oxidative carbonylation of methanol and ethanol to MEC. The ratio of phen to NMI has great effect on the yield of MEC and the selectivity for MEC. When the reaction was carried out under the conditions of n(CuCl)∶ n(phen)∶ n(NMI)=1∶1.25∶1.25, V(MeOH)/ V(EtOH)=0.25, p=2.4 MPa, θ=120 ℃ and t=2 h, the MeOH conversion, the EtOH conversion and the MEC yield were 44.3%, 22.3% and 10.4%, respectively.