生物柴油降凝剂的分子结构设计、控制及其性能研究

降凝剂是生物柴油冷流特性改进的重要方法之一，具有成本低、灵活性强、效果显著等优势。由于油剂体系的复杂性以及对降凝剂构-效关系和调控作用机理认识的不足，始终难以对高效生物柴油降凝剂的开发进行实质性的指导。.本项目拟通过“模型化方法”合理简化生物柴油组成，以甲基丙烯酸甲酯-马来酸酐聚合物为模板，设计合成一系列不同分子结构的二元及三元聚合物作为生物柴油降凝剂，用于生物柴油低温流动性改进，总结不同生物柴油降凝剂的感受性及其分子构-效关系；借助量子化学、分子力学等计算化学方法，建立高效降凝剂分子设计模型；利用“原位过滤法”等多种手段探寻降凝剂分子对生物柴油结晶行为的影响，构建生物柴油降凝剂作用机理模型，进而指导新型高效生物柴油降凝剂开发，以此改善我国生物柴油降凝剂发展现状，推动低温生物柴油的推广与应用。

Pour point depressants (PPDs) is one of the important methods to improve the low temperature fluidity of biodiesel, which has the advantages of low cost, strong flexibility, and high-efficiency. Due to the complexity of the biodiesel/PPDs system and the lack of awareness about the structure-effect relationships and its regulatory mechanism of PPDs in biodiesel, it has always been difficult to provide substantial guidance for the development of high-efficiency PPDs for biodiesel..This project intends to rationalize the composition of biodiesel by the modeling method , and design and synthesize a series of binary and ternary polymers with different structures as high-efficiency PPDs to enhance the low temperature fluidity of biodiesel by using the methyl methacrylate-maleic anhydride polymer as a template. The sensitivity of various PPDs to different biodiesel and their molecular structure-effect relationships will be summarized. With the aid of computational chemistry methods such as quantum chemistry and molecular mechanics, a molecular design model of high-efficiency PPDs for biodiesel will be established. Also, the effect of these PPDs molecules on the crystallization behavior of biodiesel will be explored, and the action mechanism model of PPDs of biodiesel will be established from a molecular perspective by using the in-situ filtration and many other analysis methods, and then guiding the development of new high-efficiency PPDs of biodiesel, in order to improve the development status of PPDs of biodiesel in China and promote the promotion and application of low-temperature biodiesel.