Continuous process for preparing dimethyl carbonate

Details Continuous process for preparing dimethyl carbonate Continuous process for preparing dimethyl carbonate

C - Chemistry, Metallurgy

07

C

C07C 69/96 (2006.01) C07C 68/00 (2006.01)

Patent

CA 2073830

Disclosed is a continuous process for preparing dimethyl carbonate which comprises: a first step of introducing a gas containing carbon monoxide and methyl nitrite into a reactor filled with a solid catalyst to obtain a reaction product containing dimethyl carbonate; a second step of separating the reaction product to a non-condensed gas and a solution containing dimethyl carbonate by adding dimethyl oxalate; a third step of introducing the non-condensed gas into a regenerating column to contact it with a molecular state oxygen-containing gas and methanol whereby regenerating nitrogen monoxide to methyl, nitrite, so as to contain 2 to 7 % by volume of nitrogen monoxide in a non-absorbed gas at an outlet of the column, which in turn is introduced in the reactor of the first step; a fourth step of extracting, distilling and separating dimethyl carbonate from the solution by further adding dimethyl oxalate to remove methanol; and a fifth step of distilling and separating dimethyl carbonate from a mixed solution to remove dimethyl oxalate and recycling the removed dimethyl oxalate to the fourth step.

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