| 摘要 |
PROBLEM TO BE SOLVED: To actualize a method capable of producing a carbonic acid ester at a high reaction rate and in high selectivity by adding a specific chlorine compound in a liquid phase method for producing various kinds of carbonic acid esters from carbon monoxide and a nitrous acid ester in the presence of a platinum group catalyst. SOLUTION: Carbon monoxide and a nitrous acid ester are subjected to a liquid-phase catalytic reaction by using both a catalyst comprising a platinum group metal or its salt and at least one chlorine compound selected from hydrogen chloride, nitrosyl chloride and chloride. Palladium or its salt is especially preferable as the platinum group metal or its salt. The used amount of the catalyst is preferably 1-100 wt.ppm calculated as a metal based on the reaction solution. The used amount of the chloride compound is 10-300 times, especially 30-150 times as much as that of the platinum group metal. The partial pressure of carbon monoxide is especially preferably about 1-100kg/cm<2> G, especially preferably about 10-50kg/am<2> G. A high-boiling carbonic acid ester can be produced by this method. The high-boiling carbonic acid ester is useful as a lubricant. |
