Preparation of dimethyl carbonate
AssigneeTexaco Inc.
InventorAjit K. Bhattacharya
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Abstract
An organic carbonate such as dimethyl carbonate is prepared by reacting an alcohol such as methanol and carbon monoxide in the presence of a catalyst system containing Cu(OMe)Cl as catalyst and boron trifluoride, calcium chloride, benzyltriethylammonium chloride, etc. as promoters.
Claims9
The method of preparing a carbonic acid ester R.sub.2 CO.sub.3 wherein R is a hydrocarbon group selected from the group consisting of alkyl, alkaryl, aralkyl, cycloalkyl, and aryl hydrocarbon groups which comprises
- reacting an alcohol ROH with carbon monoxide and oxygen in the presence of a catalyst system containing
- (a) as catalyst a copper hydrocarbonoxy halide Cu(OR')X wherein R' is a hydrocarbon group selected from the group consisting of alkyl, alkaryl, aralkyl, cycloalkyl, and aryl and X is halide;
- and
- (b) as promoter (i) BF.sub.3, (ii) R'R.sub.3 PX, (iii) C.sub.6 H.sub.5 CH.sub.2 P(C.sub.6 H.sub.5).sub.3 X, (iv) (C.sub.4 H.sub.9).sub.4 PBr, (v) R'NR.sub.3 X, (vi) Me.sub.4 NBr, or (vii) C.sub.6 H.sub.5 CH.sub.2 N(C.sub.2 H.sub.5).sub.3 Cl thereby forming product carbonic acid ester;
- and
- recovering said product carbonic acid ester.
The method of preparing dimethyl carbonate which comprises reacting methanol with carbon monoxide and oxygen at 60.degree. C.-170.degree. C. in the presence of a catalyst system containing as catalyst Cu(OMe)Cl and as promoter C.sub.6 H.sub.5 CH.sub.2 N(C.sub.2 H.sub.5).sub.3 Cl, thereby forming product dimethyl carbonate;
- and recovering said product dimethyl carbonate.
Dependencies are inferred from the claim text.