加氢法合成DL-γ-泛内酯工艺及催化剂研究

Hydrogenation process and catalyst for synthesis of DL-γ-butyrolactone

采用共沉淀法制备纳米铜基催化剂，用于固定床反应器连续加氢制备 DL-γ-泛内酯。结果表明，异丁醛和乙醛酸羟醛缩合产物在反应温度120℃，氢气压力7 MPa，液空速0.6~0.8 h -1，n（H2）： n（醛）=80：1条件下连续加氢，DL-泛内酯的收率高达98％。催化剂经过700 h 稳定性考察，平均收率﹥96％，反应前后催化剂无明显失活现象，表明催化剂活性稳定，预计有较长使用寿命。

Copper-based catalyst was prepared by co-precipitation and was used for the preparation for DL-γ-butyrolactone in a fixed bed microreactor by the catalytic hydrogenation of the condensation prod-ucts of isobutyraldehyde and glyoxylic acid. The result showed that the optimum reaction conditions were as following：reaction temperature 120 ℃,hydrogen pressure 7 MPa,n（hydrogen）： n（aldehyde）= 80： 1 and liquid hourly space velocity 0. 6 ~ 0. 8 h - 1 . Under above conditions,the yield of product was up to 98% . The stability of catalyst was also studied. It showed that there was no obvious deactivation after reac-ting for 700 h,and the average yield was greater than 96% . The results showed that the catalyst was ex-pected to have a long service life.