改性骨架镍催化对苯二甲酸二甲酯加氢制备1,4-环己烷二甲酸二甲酯

Catalytic Hydrogenation of Dimethyl Terephthalate to Dimethyl 1,4-cyclohexanedicarboxylate over Modified Skeletal Nickel

摘要:

采用骤冷法制备改性骨架镍（QS-Ni），并将其应用于对苯二甲酸二甲酯（DMT）催化加氢制备1,4-环己烷二甲酸二甲酯（DMCD），考察了溶剂、反应温度、压力、DMT初始浓度及催化剂用量对DMT加氢反应的影响。实验结果表明：采用异丙醇为溶剂，DMT初始浓度为1.0 mol/L， DMT质量：催化剂质量为4:1，在95 ℃和6 MPa条件下反应140 min，DMT转化率为100%，目标产物DMCD选择性达92.3%。催化剂QS-Ni循环使用16釜后，DMT转化率在99.3%以上，DMCD选择性为92.0%。

Abstract:

The modified skeletal Ni catalyst was prepared by quenching technique, and it was employed for the catalytic hydrogenation of dimethyl terephthalate(DMT) to Dimethyl 1,4-cyclohexanedicarboxylate (DMCD). Effects of solvent, reaction temperature, pressure, initial concentration of DMT and amount of catalyst have been investigated. Under optimal reaction conditions: c(DMT) =1.0 mol/L, m(DMT): m(catalyst) = 4:1, 95 ℃, 6.0 MPa pressure, the selectivity of DMCD was up to 92.3% in 140 min with 100% conversion of DMT in isopropanol solvent. After QS-Ni catalyst was recycled for 16 times, conversion of DMT and selectivity to DMCD still remain at 99.3% and 92.0%, respectively.