Patent ID: 8871968
Filing Date: 2014-10-28
Classification: B01J,C07C

Abstract:
1. A process of producing oxalate, comprising: i) subjecting a gas phase stream, methanol and oxygen, in a supergravity rotating bed reactor II, to an oxidative esterification reaction to produce an effluent VI, wherein the gas phase stream V comprises NO; ii) separating effluent VI to obtain an methyl nitride effluent VII; iii) contacting the methyl nitrite effluent VII and a CO gas II, in a coupling reactor II, with a catalyst II to form a dimethyl oxalate effluent VIII and a gas phase effluent IX comprising NO; iv) separating the dimethyl oxalate effluent VIII to obtain a dimethyl oxalate product stream I; v) optionally mixing the gas phase effluent IX with the gas phase stream V prior to entering the supergravity rotating bed reactor II; wherein the supergravity rotating bed reactor II comprises a rotor and the rotor has a porous filler layer attached thereto, wherein the catalyst II comprises Pd supported on a catalyst carrier and has a Pd amount of 0.01-1% based on a weight of elemental Pd relative to a weight of the catalyst carrier.