The preparation of biological diesel oil from Xanthoceras sorbifolia seed by transesterification in supercritical methanol with catalyst of ionic liquid [C4MIm]HSO4 was discussed in this paper. The variables affecting the fatty acid methyl ester yield during the transesterification reaction, such as the ratio of methanol oil to Xanthoceras sorbifolia Bunge oil, the reaction temperature, the reaction time,the reaction pressure,the catalyst content and recycle of catalyst were investigated. The experimental results showed that yield of 92. 33% was achieved when the reaction was performed with 42 : 1 of the ratio of methanol to Xanthoceras sorbifolia Bunge oil and [C4MIm]HSO4 content of 0. 5wt% at 300 'C for 11 Mpa and 25 min. The catalyst can be used repeatedly.%利用[C4MIm]HSO4离子液体为催化剂,对其催化文冠果种仁油超临界甲醇酯交换法制备生物柴油进行了研究.考察了醇油摩尔比、反应温度、反应时间、反应压力、催化剂用量及催化剂重复使用对酯交换反应的影响.结果表明,在300℃,醇油摩尔比42∶1,反应时间25 min,反应压力11 MPa,催化剂用量为0.5wt％的优化工艺条件下,产物中甲酯收率可达92.33％,催化剂可重复多次使用.
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