对苯二甲酸二甲酯选择性加氢的研究

In the first part, Ru-based heterogeneous catalysts were prepared and used to catalyze the selective hydrogenation of dimethyl terephthalate (DMT) for preparing dimethyl 1,4-cyclohexanedicarboxylate (DMCD). First, the effects of supports, preparation methods, treating conditions, were investigated for the selective hydrogenation of DMT. Results showed that, Ru/TiO2 prepared from a simple reduction in H2 flow at 500℃ after the incipient wetness impregnation performed the highest activity on this reaction. Furthermore, various reaction conditions such as solvent, temperature, and hydrogenion pressure were studied. Then, a conversion higher at 97.9% was reached within 60 minutes under the conditions of 0.26 mol/L substrate in isopropyl alcohol solution, 387 mol ratio of substrate to Ru, 6 MPa and 120℃, but the selectivity to DMCD was 93.8%. The selectivity can be improved to 99% by simply reducing the reaction temperature to 80℃.