超临界甲醇法制备生物柴油过程的热力学行为

The thermodynamics in the production of biodiesel by supercritical methanol transesterification

超临界甲醇法制备生物柴油的过程以其显著的优点备受研究者关注,而其操作条件的改善更是研究重点.为了控制超临界甲醇法制备生物柴油过程的操作条件,需要预测超临界甲醇-油脂二元系统的临界参数.文中采用C-G基团贡献法和L-B混合规则对豆油-甲醇二元系的临界参数进行理论计算,与实验结果比较,平均误差为1.7%.此外,利用溶解度参数概念计算了不同体系条件下甲醇和油脂组分的溶解度参数,并将二者的溶解度参数差和体系的相态联系起来,从而讨论了有利于超临界酯交换反应进行的热力学条件.

In order to control the operating conditions in biodiesel production using supercritical methanol, the critical parameters of the supercritical methanol and oil binary system should be predicted. The C-G group contribution method and L-B mixing rules were used to calculate the critical parameters of the soya bean oil and methanol system in theory, and the average error was 1.7% compared with the experimental results. In addition, by using the concept of solubility parameters, the authors calculated the solubility parameters of methanol and oil in different systems, associated their solubility difference A8 with the phase state of the system, and thereby concluded the thermodynamic conditions in favor of the supereritical transesterifieation.