加氢法生产环己烷1,2-二甲酸二(2-乙基己)酯工艺

以邻苯二甲酸二(2-乙基己)酯（DEHP，工业级）为原料，采用固定床加氢工艺和贵金属Ru-Pd催化剂，制备环己烷1,2-二甲酸二(2-乙基己)酯。分别考察了温度、压力、空速、氢气与原料的体积比对反应活性的影响。试验结果表明：在反应温度190℃、压力15MPa、体积空速0.5h?1、氢气与原料的体积比为800∶1的条件下，原料DEHP转化率保持在99.99%以上，目标产物选择性高于99.7%。连续运行1000h，催化剂仍具有优异的加氢活性。

Preparation of di(2-ethylhexyl)1,2-cyclohexane dicarboxylate by hydrogenation

Di(2-ethylhexyl)1,2-cyclohexane dicarboxylate was prepared，by using bis(2-ethylhexyl) phthalate (DEHP，industrial grade) as raw material，and with fixed-bed hydrogenation process and noble metal Ru-Pd catalyst. The influence of temperature，pressure，space velocity and volumetric ratio of hydrogen to oil on catalytic activity were investigated. Under process conditions of reaction temperature 190℃，pressure 15MPa，space velocity 0.5h?1 and volumetric ratio of hydrogen to oil 800∶1，DEHP conversion was above 99.99% and selectivity was higher than 99.7%. Moreover，the catalyst kept excellent hydrogenation activity during 8000h test running.