PROCESS FOR PREPARING OXALATE BY CARBON MONOXIDE GAS-PHASE METHOD

摘要

Disclosed is a process for preparing oxalate by carbon monoxide gas-phase method, which includes the following steps: a) introducing a nitrite, water and an inorganic acid into a reactor I firstly, and separating the produced effluent to obtain a effluent II of nitric oxide; b) introducing the effluent II of nitric oxide, C1-C4 alkanol and oxygen into a reactor II to react, and separating the produced effluent to obtain a effluent IV containing C1-C4 alkyl nitrite; c) introducing the effluent IV containing C1-C4 alkyl nitrite and a stream of carbon monoxide gas into a coupling reactor to generate a effluent VI containing nitric oxide, wherein the reactor I and /or the reactor II are (is) a rotary super-gravity reactor.