Method for preparing oxalate from carbon monoxide by gaseous phase method

摘要

Disclosed is a method for preparing an oxalate from carbon monoxide(CO) by gaseous phase method, which includes the following steps: (1) allowing a gaseous stream V containing nitrogen monoxide to occur oxyesterification with methanol and oxygen in a super-gravity rotating bed reactor II, to obtain an efflux VI containing methyl nitrite; and introducing methyl nitrite efflux VII obtained after separating the efflux VI and CO gas II into a coupling reactor II, contacting with a catalyst II, to obtain dimethyl oxalate efflux VIII and a gaseous efflux IX containing nitrogen monoxide; then separating the obtained dimethyl oxalate VIII to obtain dimethyl oxalate product I; (2) optionally, returning the gaseous efflux IX containing nitrogen monoxide to the step (1), mixing with the gaseous stream V containing nitrogen monoxide and recycling. The method mainly solves the technical problem of low utilization rate of nitrogen oxides or nitrite in the prior art.