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

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,m(DMT)∶m(催化剂)=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%。

The modified skeletal Ni catalyst was prepared by the 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 the 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 the 100% conversion of DMT in isopropanol solvent.After QS-Ni catalyst was recycled for 16 times,the conversion of DMT and selectivity to DMCD still remain at 99.3% and 92.0%,respectively.