The present invention relates to a process of producing oxalate by CO gas phase method for chiefly solving the technical problem of the low utilization efficiency of nitrogen oxides or nitrous acid esters in the prior art. The present invention solves the problem in a better way by using the following steps including: a gas phase stream V containing NO and methanol and oxygen enter a supergravity rotating bed reactor II and are subjected to the oxidative esterification reaction to produce an effluent VI containing methyl nitrite; a methyl nitrite effluent VII obtained from separating said effluent VI together with a CO gas II enter a coupling reactor II and is contacted with a catalyst II to react to form a dimethyl oxalate effluent VIII and a gas phase effluent IX containing NO; the resultant dimethyl oxalate effluent VIII is separated to obtain a dimethyl oxalate product I; optionally, the gas phase effluent IX containing NO is returned to the step above so as to be mixed with the gas phase stream V containing NO for being recycled. Therefore, the process is applicable to the industrial production of oxalate by CO gas phase method.
本发明涉及一种通过CO气相法生产
草酸的方法,主要解决了现有技术中氮氧化物或
亚硝酸酯利用效率低的技术问题。本发明通过以下步骤更好地解决了这一问题:含有NO、
甲醇和
氧气的气相流体V进入超重力旋转床反应器II,经过氧化酯化反应产生含有
亚硝酸甲酯的流出物VI;将分离得到的
亚硝酸甲酯流出物VII与CO气体II一起进入偶联反应器II,并与催化剂II接触反应,形成二甲
草酸酯流出物VIII和含有NO的气相流出物IX;将得到的二甲
草酸酯流出物VIII分离得到二甲
草酸酯产品I;可选地,含有NO的气相流出物IX返回上述步骤,与含有NO的气相流体V混合以进行循环利用。因此,该方法适用于通过CO气相法工业生产
草酸。