【摘要】 采用贵金属钯系催化剂,以对苯二甲酸二甲酯为原料,低压加氢生成1,4 环己烷二甲酸二甲酯。考察了温度、压力、液体空速、氢油比等对反应活性的影响,进行了200h的催化剂寿命评价,并对催化剂进行了表征。结果表明,随着温度和氢油比的升高,转化率明显提高,选择性变化较小;液体空速增大,转化率和选择性均降低,压力对转化率和选择性影响较小。在220℃,4.0MPa的条件下,对苯二甲酸二甲酯的转化率大于95%,1,4 环己烷二甲酸二甲酯的选择性大于94%,金属钯是该催化剂的主要活性中心。更多还原

【Abstract】 A palladium based catalyst was used to synthesize dimethyl 1,4-cyclohexanedicarboxylate via the hydrogenation of dimethyl terephthate under low pressure. The influences of temperature, pressure, liquid space velocity and hydrogen-to-dimethyl terephthate ratio on the reactivity were investigated. The durability test of the catalyst was carried out for 200h. The result showes that the conversion of reactant increases dramatically with the rising of the temperature and the hydrogen-to-dimethyl terephthate ratio while the selectivity changes slightly. Further more, both of the conversion and the selectivity decrease with the increase of the liquid space velocity. However, the pressure has little effect on the reaction. The conversion of dimethyl terephthate and the selectivity to dimethyl 1,4-cyclohexanedicarboxylate are higher than 95% and 94% respectively. Metallic palladium is the main active center of the catalyst.更多还原