Patent ID: 7888525

Claim:
A method for preparing organic carbonates comprising subjecting an alcohol compound to oxidative carbonylation in the presence of carbon monoxide, oxygen and a liquid-phase catalytic system, to form a organic carbonates of the formula CO(RO) 2 , wherein R representing an alkyl having 1 to 6 carbon atoms, and wherein the liquid-phase catalytic system includes at least one catalyst, at least one additive, and at least one ionic liquid composed of a cation and an anion, and wherein the catalyst is a copper catalyst, the additive is selected from the group consisting of an imidazole compound, a benzimidazole compound, a pyridine compound, a bipyridyl compound, a pyridazine compound, a pyrimidine compound, a pyrazine compound and a mixture thereof, and the cation of the ionic liquid has a structure of formula (I) or (II): wherein R 1 and R 3 are, independently, C 1-12 alkyl, C 1-12 alkylamino, C 1-12 alkoxy, C 1-12 alkanoyl, C 3-20 cycloalkyl, C 3-20 cycloalkyloxy, C 3-20 cycloalkylacyl, C 6-20 aryl, C 7-20 arylalkyl or C 7-20 alkylaryl, each of these groups may be further substituted by halogen, nitro and/or cyano, and R 2 , R 4 and R 5 are, independently, hydrogen, halogen, nitro, cyano, amino, C 1-12 alkyl, C 1-12 alkylamino, C 1-12 alkoxy, C 1-12 alkanoyl, C 3-20 cycloalkyl, C 3-20 cycloalkyloxy, C 3-20 cycloalkylacyl, C 6-20 aryl, C 7-20 arylalkyl or C 7-20 alkylaryl, wherein C 1-12 alkyl, C 1-12 alkylamino, C 1-12 alkoxy, C 1-12 alkanoyl, C 3-20 cycloalkyl, C 3-20 cycloalkyloxy, C 3-20 cycloalkylacyl, C 6-20 aryl, C 7-20 arylalkyl or C 7-20 alkylaryl may be further substituted by halogen, nitro and/or cyano; and wherein R 6 represents C 1-12 alkyl, C 1-12 alkylamino, C 1-12 alkoxy, C 1-12 alkanoyl, C 3-20 cycloalkyl, C 3-20 cycloalkyloxy, C 3-20 cycloalkylacyl, C 6-20 aryl, C 7-20 arylalkyl or C 7-20 alkylaryl, each of these groups may be further substituted by halogen, nitro and/or cyano, and R 7 , R 8 , R 9 , R 10 and R 11 are, independently, hydrogen, halogen, nitro, cyano, amino, C 1-12 alkyl, C 1-12 alkylamino, C 1-12 alkoxy, C 1-12 alkylacyl, C 3-20 cycloalkyl, C 3-20 cycloalkyloxy, C 3-20 cycloalkylacyl, C 6-20 aryl, C 7-20 arylalkyl or C 7-20 alkylaryl, wherein C 1-12 alkyl, C 1-12 alkylamino, C 1-12 alkoxy, C 1-12 alkylacyl, C 3-20 cycloalkyl, C 3-20 cycloalkyloxy, C 3-20 cycloalkylacyl, C 6-20 aryl, C 7-20 arylalkyl and C 7-20 alkylaryl may be further substituted by halogen, nitro and/or cyano.