用Raney镍和钯碳催化剂制备植物甾烷醇

Preparation of phytostanols with Raney-Ni and Pd/C

以植物甾醇为原料,分别以Raney镍和钯碳为催化剂,以反应温度、氢气压力、反应时间、转速、催化剂添加量等因素进行正交试验优化植物甾醇氢化工艺参数。以Raney镍为催化剂,最优工艺条件为:反应温度135℃,氢气压力2.5 MPa,反应时间5.0 h,转速700 r/min,催化剂添加量40%。该条件下,植物甾醇的氢化率为94.18%,羟基值(KOH)为124.79 mg/g。以钯碳为催化剂,最优工艺条件为:反应温度130℃,氢气压力2.6 MPa,反应时间4.5 h,转速580 r/min,催化剂添加量1.5%。该条件下,植物甾醇的氢化率为93.65%,羟基值(KOH)为125.04 mg/g。

Phytosterols were used as the basic raw materials, Raney - Ni and Pd/C were used as catalysts, and orthogonal design method was employed to optimize hydrogenation conditions of phytosterols, such as reaction temperature, hydrogen pressure, reaction time, rotating speed and catalyst dosage and so on. The results showed that when Raney - Ni was used as a catalyst, the optimum conditions were as follows： reaction temperature 135℃, hydrogen pressure 2. 5 MPa, reaction time 5.0 h, rotating speed 700 r/min, catalyst dosage 40%. Under these conditions, the hydrogenation rate of phytosterols was 94. 18% and hydroxyl value was 124. 79 mgKOH/g. When Pd/C was used as a catalyst, the optimum conditions were as follows： reaction temperature 130 ℃, hydrogen pressure 2.6 MPa, reaction time 4. 5 h, rotating speed 580 r/min, catalyst dosage 1.5%. Under these conditions, the hydrogenation rate of phytosterols was 93.65% and hydroxyl value was 125.04 mgKOH/g.