柱层析硅胶固载K_2CO_3催化合成生物柴油的研究

Synthesis of biodiesel with silica gel column chromatography catalyzed with immobilized K_2CO_3

研究了柱层析硅胶-K2CO3固体碱催化剂的制备条件,并对其进行XRD、FT-IR和SEM表征分析。结果表明,部分K2CO3吸收空气中的CO2生成KHCO3,K2CO3与KHCO3分散到硅胶表面,增强了催化效果。并考查了催化剂用量、醇油摩尔比、反应时间对生物柴油制备的影响。研究表明,催化剂的制备温度为120℃,催化剂用量为原料油质量的5%,醇油摩尔比为12∶1,反应温度70℃,反应时间2 h,生物柴油收率可达95.2%。

The preparation condition of silica gel column chromatography-K2CO3 loaded solid-base catalyst was studied.The catalyst was characterized by means of XRD,FT-IR and SEM.The experimental results showed that part of K2CO3 generated KHCO3 due to absorbing CO2 in the air.K2CO3 and KHCO3 dispersed on the silicon surface could enhance the catalytic activity.At the optimum conditions：catalyst preparation temperature：120 ℃,amount of catalyst in the fuel oil： 5%,ratio of alcohol to oil： 12∶1,reaction temperature： 70 ℃and reaction time： 2 h,the biodiesel yield could reach up to 95.2%.