脂肪酸在超临界甲醇中的酯化反应研究

超临界甲醇中的酯化和酯交换反应是利用植物油、动物油或废油脂制备生物柴油的新工艺.它的最大特点是不需要添加催化剂,超临界甲醇既是反应媒介,又是反应物.

Esterification of fatty acid in supercritical methanol

Esterification of oleic acid in supercritical methanol was investigated; the effects of operation parameters such as reaction temperature, reaction time and molar ratio of methanol to oleic acid on the conversion of oleic acid were examined. The results illustrated that the esterification of oleic acid in supercritical methanol can be realized under much milder conditions (i.e. lower temperature, shorter reaction time as well as lower molar ratio of methanol to oleic acid) than the transesterification of grease in supercritical methanol. These suggested that triglycerides first hydrolyze to fatty acids and then the fatty acids undergo methyl esterification to form methyl esters in supercritical methanol. Therefore, it is feasible to use the feedstock containing higher water and free fatty acid, such as waste cooking oil and deodorizer distillate, to produce biodiesel in low cost with supercritical methanol.