Biodiesels are renewable fuel that may be produced from various feedstock using different techniques. It is endorsed in some countries of the world as a viable substitute to diesel fuel. While biodiesel possesses numerous benefits, the cold flow properties (CFP) of biodiesel in comparison with petro-diesel are significantly less satisfactory. This is due to the presence of saturated and unsaturated fatty acid esters. Poor CFP of biodiesel subsequently affect the performance in cold weather and damage the engine fuel system, as well as choke the fuel filter, fuel inlet lines and injector nozzle. Previously, attempts were made to minimize the damaging impact of bad cold flow through the reduction of pour point, cloud point and the cold filter plugging point of biodiesel. This study is focused on the biodiesel CFP-related mechanisms and highlights the factors that initialise and pace the crystallisation process. This review indicates that the CFP of biodiesel fuel can be improved through the utilisation of different techniques. Winterisation of some biodiesel has shown to improve CFP significantly. Additives such as polymethyl acrylate improved CFP by 3-9 ° C. However, it is recommended that improvement methods in terms of fuel properties and efficiency should be carefully studied and tested before implemented in industrial applications as it might impact biodiesel yield, cetane number etc.

生物柴油是可再生燃料，可以使用不同技术从各种原料中生产。它已被世界上一些国家认可为柴油的可行替代品。尽管生物柴油具有许多好处，但与石油柴油相比，生物柴油的冷流特性（CFP）明显较差。这是由于存在饱和和不饱和脂肪酸酯。生物柴油的CFP差会影响寒冷天气下的性能，并损坏发动机燃油系统，并阻塞燃油滤清器，燃油进口管线和喷油嘴。以前，曾尝试通过降低生物柴油的倾点，浊点和冷滤器堵塞点来最大程度地减少不良冷流的破坏性影响。这项研究的重点是与生物柴油CFP相关的机制，并重点介绍了初始化和加快结晶过程的因素。这项审查表明，可以通过使用不同的技术来提高生物柴油燃料的CFP。某些生物柴油的冬季防冻已证明可以显着改善CFP。添加剂（如聚丙烯酸甲酯）可将CFP改善3-9°C。但是，建议在工业应用之前，应仔细研究和测试燃料特性和效率方面的改进方法，因为这可能会影响生物柴油的产率，十六烷值等。某些生物柴油的冬季防冻已证明可以显着改善CFP。添加剂（如聚丙烯酸甲酯）可将CFP改善3-9°C。但是，建议在工业应用之前，应仔细研究和测试燃料特性和效率方面的改进方法，因为这可能会影响生物柴油的产率，十六烷值等。某些生物柴油的冬季防冻已证明可以显着改善CFP。添加剂（如聚丙烯酸甲酯）可将CFP改善3-9°C。但是，建议在工业应用之前，应仔细研究和测试燃料特性和效率方面的改进方法，因为这可能会影响生物柴油的产率，十六烷值等。