一氧化碳偶联制草酸二甲酯工艺优化  

Energy Saving Optimization of Dimethyl Oxalate Production by Carbon Monoxide Coupling

作　　者：刘敏 苟天赐 郭盼春 LIU Min;GOU Tian-ci;GUO Pan-chun(Xinjiang Tianzhichenye Chemical Co.,Ltd.,Shihezi 832000,China)

机构地区：[1]新疆天智辰业化工有限公司,新疆石河子832000

出　　处：《化工管理》2022年第5期135-137,共3页Chemical Engineering Management

摘　　要：新疆天智辰业化工有限公司35万吨/年乙二醇项目,乙二醇合成技术采用一氧化碳气相偶联反应生成草酸二甲酯,草酸二甲酯加氢进一步反应生成乙二醇。草酸二甲酯合成系统在正常运行时,有平均量为80 Nm^(3)/h的循环气释放至亚硝酸甲酯回收塔,循环气中含有12.0%的一氧化碳、4.5%的一氧化氮、12.0%的亚硝酸甲酯不能高值化回收利用,造成浪费,增加了乙二醇生产成本。本文主要介绍草酸二甲酯合成系统节能优化改造技术,停车检修后的草酸二甲酯A合成系统开车时,利用正在运行的草酸二甲酯B合成系统的循环气为A合成系统提供开车时必需的一氧化氮和亚硝酸甲酯,A合成系统开车时无需再引入新鲜气体,无需开启NOx发生器及附属装置,具有显著的经济效益。At Xinjiang Tianzhi Chanye Chemical Co.,Ltd.350000 tons/year glycol project,glycol synthesis technology adopts carbon monoxide gas phase coupling reaction to generate dimethyl oxalate,and further reaction of dimethyl oxalate hydrogenation to generate glycol.In the normal operation of dimethyl oxalate synthesis system,the average amount of 80 Nm^(3)/h of circulating gas is released to the nitrite methyl ester recovery tower.The circulating gas contains 12.0% carbon monoxide,4.5%Nitric Oxide,and 12.0%methyl nitrite,which can not be recycled at high value,resulting in waste and increasing the cost of ethylene glycol production.This paper mainly introduces the energy saving optimization transformation technology of dimethyl oxalate synthesis system.During the start-up of dimethyl oxalate a synthesis system after shutdown and maintenance,the circulating gas of dimethyl oxalate B synthesis system is used to provide nitric oxide and methyl nitrite necessary for the start-up of synthesis system A.There is no need to introduce fresh gas during the start-up of synthesis system A.There is no need to start the NO_(x) generator and auxiliary devices,which has signif icant economic benef its.

关 键 词：草酸二甲酯 循环气回收 降本增效 

分 类 号：TQ013.2[化学工程]