In biodiesel production by trans-esterification, one of the essential compound is glycerin. Global glycerin production is increasing significantly, projecting a global value reduction for glycerol. Consequently the scientific community had been encouraged to investigate converting glycerol into more valuable products. In this research, the primary sources and processes of biodiesel production are surveyed. Where the processes that involve glycerin are reviewed and the diesel engine performance and emissions under variant states are discussed. According to the results of this study, it is reported that the choice of an optimal diesel/biodiesel significantly depends on the materials, additives and the engine condition. Glycerol etherification, carboxylation, and glycerol carbonate, however, had been identified as the widely manufactured and used additives. It is further observed that the use of these such additives has reduced several emissions, which is an important factor. In addition, it is suggested that using glycerin additives improves the properties of biodiesel. Acetone, on the other hand is introduced as one of the most important additives in the combination of diesel and biodiesel fuel due to the reduction of maximum emission. The presence of hydroxyl groups can reduce NOx. Finally, the diethyl ether additive can be mentioned which increases the thermal efficiency and increases the brake-specific fuel consumption (BSFC).

在通过酯交换生产生物柴油中，必不可少的化合物之一是甘油。全球甘油产量显着增加，预计全球甘油价值将下降。因此，鼓励科学界研究将甘油转化为更有价值的产品。在这项研究中，调查了生物柴油生产的主要来源和过程。其中审查了涉及甘油的过程，并讨论了不同状态下的柴油发动机性能和排放。根据这项研究的结果，据报道，最佳柴油/生物柴油的选择在很大程度上取决于材料、添加剂和发动机条件。然而，甘油醚化、羧化和甘油碳酸酯，已被确定为广泛制造和使用的添加剂。进一步观察到，使用这些此类添加剂减少了一些排放，这是一个重要因素。此外，建议使用甘油添加剂改善生物柴油的性能。另一方面，由于最大排放量的减少，丙酮被引入作为柴油和生物柴油燃料组合中最重要的添加剂之一。羟基的存在可以减少NOx。最后，可以提到二乙醚添加剂，它提高了热效率并增加了制动比燃料消耗 (BSFC)。建议使用甘油添加剂改善生物柴油的性能。另一方面，由于最大排放量的减少，丙酮被引入作为柴油和生物柴油燃料组合中最重要的添加剂之一。羟基的存在可以减少NOx。最后，可以提到二乙醚添加剂，它提高了热效率并增加了制动比燃料消耗 (BSFC)。建议使用甘油添加剂改善生物柴油的性能。另一方面，由于最大排放量的减少，丙酮被引入作为柴油和生物柴油燃料组合中最重要的添加剂之一。羟基的存在可以减少NOx。最后，可以提到二乙醚添加剂，它提高了热效率并增加了制动比燃料消耗 (BSFC)。