| 摘要 |
<p>PURPOSE: A method for preparing 1,4-butanediol from an maleic acid ester is provided to produce 1,4-butanediol stably with high selectivity, high yield and high productivity without the treatment for reactivating a catalyst. CONSTITUTION: The method comprises the step of hydrogenating an maleic acid ester in the presence of a catalyst represented by CuO(a)MnO2(b)M(c)SiO2(d), wherein a, b, c and d are a percentage based on weight, a is 40-90, b is 0.15-5, c is 0.001-5 and d is 5-50; and M is at least one oxide of metal selected from the group consisting of Zn, Pt, Pd, Re, Ru and Rh. Preferably the catalyst is used in the hydrogenation after activated by using hydrogen or a hydrogen-containing gas at a temperature of 100-250 deg.C for 1-60 hours. Preferably the hydrogenation is carried out at a temperature of 140-260 deg.C and a pressure of 30-120 atm with a weight hourly space velocity of a maleic acid ester of 0.1-2.0/hr. Preferably the maleic acid ester is selected from dimethyl malate, diethyl malate, dipropyl malate, diisopropyl malate and dibutyl malate.</p> |
