Catalyst-free biodiesel production through supercritical transesterification is faster with the high conversion and a more environment-friendly route than conventional catalyst transesterification. Improving and exploring the new possibilities in this alternative biodiesel production method by including newly available technology will lead us to a more sustainable future. In this paper, supercritical transesterification of biodiesel production has been reviewed in detail. The different parameters of this method, such as temperature, pressure, molar ratio, alcohol types, and residence time which affect the yielding and quality of fuel, have been reviewed. Besides, recycling the energy and suitable feedstock for this method has also been explored to reduce the intensive energy demand and operating cost. Furthermore, light has also thrown on co-solvents effect on this method to reduce the extreme reaction conditions required. At last, the review concludes future recommendations in supercritical transesterification along with the challenges in energy integration and recycling.

中文翻译：

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用于生物柴油生产的超临界酯交换路线：参数对产量和未来前景的影响

与传统的催化剂酯交换相比，通过超临界酯交换的无催化剂生物柴油生产速度更快，转化率高，路线更环保。通过采用新的可用技术，改进和探索这种替代生物柴油生产方法的新可能性，将引领我们走向更可持续的未来。本文详细综述了生物柴油生产中的超临界酯交换反应。该方法的不同参数，如温度、压力、摩尔比、醇类和停留时间等影响燃料产率和质量的参数已被审查。此外，还探索了该方法的能源和合适原料的回收利用，以降低密集的能源需求和运营成本。此外，光还对这种方法产生了共溶剂效应，以减少所需的极端反应条件。最后，该评论总结了超临界酯交换的未来建议以及能源整合和回收方面的挑战。