CuZnAl催化剂用于制备高反顺比1,4-环己烷二甲醇

Synthesis of 1,4-cyclohexanedimethanol with high rans-/cis-ratio over CuZnAl catalyst

采用成核晶化分步法制备Cu Zn Al催化剂,在温和条件下,应用于1,4-环己烷二甲酸二甲酯加氢制备1,4-环己烷二甲醇反应。考察1,4-环己烷二甲酸二甲酯初始浓度、反应温度、反应压力、原料配比、催化剂中Cu含量及掺杂助剂对1,4-环己烷二甲酸二甲酯加氢制备1,4-环己烷二甲醇的影响。结果表明,采用固定床工艺,最佳工艺条件为:甲醇为溶剂,1,4-环己烷二甲酸二甲酯初始浓度25%,反应温度230℃,氢压4.0 MPa,V(H2)∶V(1,4-环己烷二甲酸二甲酯)=3 000,此条件下,催化剂活性组分Cu质量分数为50%和催化剂助剂为2%Mg时,1,4-环己烷二甲酸二甲酯转化率为99.90%,1,4-环己烷二甲醇选择性为96.09%,1,4-环己烷二甲醇反顺比大于3.3。

CuZnAl catalyst was prepared by nucleation points crystallization steps, and were used for the synthesis of 1,4-eyclohexanedirnethanol （CHDM） from hydrogenation of dimethyl 1,4-cyelohexanediear- boxylate（DMCD） under the mild conditions. The effects of DMCD initial concentrations,reaction temper- atures, reaction pressure, volume ratio of hydrogen to DMCD, Cu contents and the additives in the catalyst were investigated. The experimental results showed that usingthe fixed bed process, DMCD conversion of 99.8% ,the selectivity to CHDM of 96.5% and rans-CHDM/cis-CHDM ratio 〉 3.3 were attained under the optimal reaction condition as follows： DMCD initial concentration 25wt%, reaction temperature 210 ℃.hydrogen oressure 4.0 MPa. V（ H2） ： V（ DMCD） =3000.