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20世纪80年代以来,随着C1化学化工的发展,草酸酯法合成乙二醇成为研究的热点。草酸酯合成法主要原料为NO、CO、H2和醇类,反应原理是NO与O2反应生成N2O3,再利用醇与N2O3反应生产亚硝酸酯,CO与亚硝酸酯在催化剂作用下氧化偶联得到草酸二甲酯,草酸二甲酯再经过催化加氢制得乙二醇。近年来,我国在草酸酯加氢合成乙二醇技术开发方面取得了长足进展。本文从催化剂、生产工艺、设备以及产品纯化等方面概述了近年来我国草酸酯加氢合成乙二醇专利技术研究进展。
Since the 1980s, with the development of chemical and chemical industries in C1, the synthesis of ethylene glycol by oxalate has become a hot research topic. Oxalic acid ester synthesis method for the main raw material of NO, CO, H2 and alcohols, the reaction principle is the reaction of NO and O2 to generate N2O3, and then the use of alcohol and N2O3 reaction nitrite, CO and nitrite oxidation coupling under the action of a catalyst Get dimethyl oxalate, dimethyl oxalate catalytic hydrogenation to obtain ethylene glycol. In recent years, great progress has been made in the development of ethylene glycol technology in oxalate hydrogenation. This paper summarizes the research progress of patented technology of hydrogenation of oxalate in China in recent years from the aspects of catalyst, production technology, equipment and product purification.