The invention relates to a process wherein a dialkyl carbonate stream containing an ether alkanol impurity is subjected to extractive distillation using an extraction solvent to obtain a top stream comprising dialkyl carbonate and a bottom stream comprising the ether alkanol impurity and the extraction solvent, wherein the extraction solvent is an organic compound containing one or more ester moieties and/or ether moieties which organic compound does not contain a hydroxyl group. Further, the invention relates to a process for making a diaryl carbonate, comprising reacting an aryl alcohol with a stream containing a dialkyl carbonate from which stream an ether alkanol impurity has been removed in accordance with the above-described process.

Alpha/alpha-prime/alkoxylated glycerol linear carbonic esters have formula (VI): ##STR00001##
where p is an integer higher than 1, x is an integer equaling 0 or 1 with x not always being zero, and M.sub.1 is hydrogen (H). Q.sub.1 can be a hydrocarbon aliphatic group, an amino hydrocarbon group or an oxygenated amino hydrocarbon group. G.sub.1 can be an /-alkoxylated propyl group of general formula (II): ##STR00002##
where R.sub.4, R.sub.5 and R.sub.6 are variously hydrogen (H), an alkyl or an amino-alkyl group having 1 to 5 carbon atoms, or general formula (VII): ##STR00003##
where R7 is a H or a hydrocarbon group having 1 to 6 carbon atoms, and m is an integer between 0 and 10 inclusive, and X is O or NH.

Alpha/alpha-prime/alkoxylated glycerol linear carbonic esters have formula (VI): ##STR00001##
where p is an integer higher than 1, x is an integer equaling 0 or 1 with x not always being zero, and M.sub.1 is hydrogen (H). Q.sub.1 can be a hydrocarbon aliphatic group, an amino hydrocarbon group or an oxygenated amino hydrocarbon group. G.sub.1 can be an /-alkoxylated propyl group of general formula (II): ##STR00002##
where R.sub.4, R.sub.5 and R.sub.6 are variously hydrogen (H), an alkyl or an amino-alkyl group having 1 to 5 carbon atoms, or general formula (VII): ##STR00003##
where R7 is a H or a hydrocarbon group having 1 to 6 carbon atoms, and m is an integer between 0 and 10 inclusive, and X is O or NH.

Alpha/alpha-prime/alkoxylated glycerol linear carbonic esters have formula (VI): ##STR00001##
where p is an integer higher than 1, x is an integer equaling 0 or 1 with x not always being zero, and M.sub.1 is hydrogen (H). Q.sub.1 can be a hydrocarbon aliphatic group, an amino hydrocarbon group or an oxygenated amino hydrocarbon group. G.sub.1 can be an /-alkoxylated propyl group of general formula (II): ##STR00002##
where R.sub.4, R.sub.5 and R.sub.6 are variously hydrogen (H), an alkyl or an amino-alkyl group having 1 to 5 carbon atoms, or general formula (VII): ##STR00003##
where R7 is a H or a hydrocarbon group having 1 to 6 carbon atoms, and m is an integer between 0 and 10 inclusive, and X is O or NH.

Disclosed herein are new mixed metal oxide catalysts suitable as heterogeneous catalysts for catalyzing the transesterification process of aromatic alcohols with a dialkyl carbonate to form aromatic carbonates. The heterogeneous catalyst comprises a combination of two, three, four, or more oxides of Mo, V, Nb, Ce, Cu, Sn, or an element selected from Group IA or Group IIA of the periodic table.

Disclosed herein are new mixed metal oxide catalysts suitable as heterogeneous catalysts for catalyzing the transesterification process of aromatic alcohols with a dialkyl carbonate to form aromatic carbonates. The heterogeneous catalyst comprises a combination of two, three, four, or more oxides of Mo, V, Nb, Ce, Cu, Sn, or an element selected from Group IA or Group IIA of the periodic table.

Disclosed herein are new mixed metal oxide catalysts suitable as heterogeneous catalysts for catalyzing the transesterification process of aromatic alcohols with a dialkyl carbonate to form aromatic carbonates. The heterogeneous catalyst comprises a combination of two, three, four, or more oxides of Mo, V, Nb, Ce, Cu, Sn, or an element selected from Group IA or Group IIA of the periodic table.

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carbonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

The invention relates to synthesis of methyl carbamate (MC) and dimethyl carbonate (DMC) in presence of stripping inert gas or superheated methanol vapors using packed column reactor and bubble column reactor.

A process for degreasing a chemical plant is disclosed. The vessels and process lines are rinsed with a solvent comprising at least 50 wt % dialkyl carbonate, based upon the weight of the solvent.