钾霞石固体碱催化豆油酯化反应制备生物柴油

采用共沉淀法制备了钾霞石,用于催化豆油和甲醇酯化反应,在煅烧温度1 200℃,得到单一的钾霞石物相.钾霞石表面多孔,孔径分布为0.2到1.0 μm,有利于反应物分子的内扩散和接触活性位;同时对反应温度、反应时间、催化剂用量以及催化剂Li含量进行了系统研究.反应温度120 ℃,醇油摩尔比12:1,反应时间2 min,催化...

Transesterification of Soybean Oil to Biodiesel Using KAlSiO4 as Heterogeneous Base Catalyst

Solid base catalyst kalsilite (KAlSiO4) was prepared by coprecipitation method and studied for transesterification of soybean oil with methanol. A crystal phase KAlSiO4 was obtained after calcinations at 1200 oC. Meanwhile, the kalsilite provided good transportation and diffusion for reactants due to the presence of pores ranging from 0.2 to 1.0 µm. The reaction condtions such as reaction temperature and time, catalyst concentration and the Li content were systemically studied. Biodiesel yield of 19.8% was obtained under the following reaction conditions: temperature 120 oC, reaction time 2 min, methanol to oil molecular ratio 12:1, and catalyst concentration 5 wt% of soybean oil. The catalytic activity of Li modified catalyst were enhanced significantly. As a result, 100% yield was achieved under the same reaction conditions. The fixed-bed reactor testing data showed that this Li modified catalyst had a stable catalytic performance.