固体酸催化菜籽油酯交换反应与微波耦合特性

Transesterification and microwave coupling properties of rapeseed oil catalyzed by solid acid

以甲醇和菜籽油为原料,在固体酸催化剂作用下催化制备生物柴油,考察了反应温度、醇油比、催化剂用量和微波频率对混合物料介电特性的影响,并分析了化学反应体系与微波的耦合能力.试验结果显示:单因素反应条件下,混合物料介电特性随反应时间呈下降趋势;反应温度升高和催化剂用量增大都会使混合物料的介电常数和损耗因素陡降至稳定值的时间点提前,而增加醇油摩尔比起到相反的作用;醇油摩尔比越大,混合物料的介电损耗角正切越大,反应体系与微波的耦合能力越强;微波频率为2 450 MHz时,物料与微波的耦合能力比915 MHz时强.

Methanol and rapeseed oil were used as raw materials to prepare biodiesel under the action of solid acid catalyst. The effects of reaction temperature,alcohol-oil ratio,catalyst dosage and microwave frequency on dielectric properties of mixtures were investigated,and the coupling ability of chemical reaction system with microwave was also analyzed. The test results show that under the single factor reaction condition,the dielectric properties of mixture are decreased with the increasing of reaction time. Increasing the reaction temperature and the amount of the catalyst can advance the time for the dielectric constant and loss factor of mixture to stable value,and increasing the molar ratio of alcohol to oil has the opposite effect. The more the molar ratio of alcohol to oil is,the bigger the dielectric loss tangent of mixture is,and the stronger the coupling ability with microwave is. When the microwave frequency is 2 450 MHz,the coupling ability of mixture with microwave is stronger than that of 915 MHz.