| 摘要 |
PURPOSE:To prepare the titled compound in high yield under relatively low pressure, by hydrogenating an oxalic acid diester in the presence of a copper-chromium-manganese catalyst in either liquid or vapor phase. CONSTITUTION:Ethylene glycol is prepared by the vapor-phase or liquid-phase hydrogenation of an oxalic acid diester using a Cu-Cr-Mn catalyst. The weight ratios of the components of the Cu-Cr-Mn catalyst is pref. in the range of 20-80 of Cu as CuO, 20-80 of Cr as Cr2O3 and 1-15 of Mn as MnO2. When the reaction is carried out in vapor phase, it is preferable to use an oxalic acid diester composed of the residue of a 1-8C lower alcohol (e.g. dimethyl oxalate) as the raw material. In the case of liquid-phase reaction, an oxalic acid diester composed of an alcohol residue having relatively large carbon number (e.g. >=4C) is used as the raw material. |
