【摘要】 大豆油脚浸出油与甲醇在催化剂KOH作用下通过酯交换反应制得生物柴油(BDF)。用气相色谱法跟踪研究醇油摩尔比、反应温度、反应时间及催化剂用量对产物生物柴油浓度的影响,正交实验得到大豆油脚浸出油制备生物柴油最佳工艺条件为:反应温度45℃、催化剂用量1%、醇油摩尔比6∶1、反应时间45 min,生物柴油含量为96.8%。生物柴油的主要性能指标符合0#柴油标准(GB 252-1994)。考察了大豆油脚浸出油酯交换反应的动力学,由实验数据绘制的动力学曲线呈现出酯交换反应在开始阶段为二级反应,并逐步转变为一级反应,反应后期为零级反应。由动力学实验数据求出酯交换反应的动力学参数,酯交换反应的活化能为47.71 kJ/mol,频率因子为6.01×107L/(mol.min)。更多还原

【Abstract】 Biodiesel fuel(BDF) has been made by transesterification of extracted oil of soybean oil sediment with methanol in the presence of KOH as catalyst.The contents of BDF have been studied at various reaction times,temperature,molar ratio of methanol to extracted oil and catalyst concentrations by gas chromatography.Through orthogonal analysis,the optimum reacting conditions obtained for the transesterification were set at temperature 40℃,mole ratio of methanol to extracted oil 6∶1,reaction time 45 min,and catalyst dosage 1%(on extracted oil mass).The contents of BDF was 96.8% under the optimum conditions.The principal physicochemical properties of the BDF were similar to that of No.0 diesel fuel.The kinetics of transesterification of extracted oil was also studied.The experimental data could to be described by second-order reaction model for the initial stages of the transesterification and followed by first-order reaction and zero-order reaction model.The activation energy of transesterification was 47.71 kJ/mol and the frequency factor was 6.01×10~7 L/(mol·min).更多还原