一种新型柴油流动改进剂的合成及助滤性能

 介绍了一种新开发的柴油低温流动性改进剂MV-a. 该剂以醋酸乙烯酯(VA)和马来酸酐(MA)为原料, 在85℃恒温、N₂保护下聚合, 得到二元交替共聚物, 再用高碳胺进行胺解制得. 对MV-a主要官能团进行了IR表征, 考察了单体摩尔配比、反应温度、溶剂用量、引发剂用量对MV-a性能的影响. 结果表明, 交替聚合反应是可行的; VA的用量对MV-a降凝助滤效果影响较大, VA和MA最佳摩尔配比为2; 4种反应影响因素的作用大小顺序为: 单体摩尔配比>反应温度>溶剂用量>引发剂用量. 通过对张家港0^#等3种柴油低温测试, MV-a可降低冷滤点3～5℃; 与EVA-1复配使用, 可降低冷滤点3～9℃, 复配体系具有协同作用.

SYNTHESIS OF A NEW LOW TEMPERATURE FLOW IMPROVER FOR DIESEL FUEL AND ITS CFPP REDUCING PROPERTIES

A new developed low temperature flow improver MV-a for diesel fuel was introduced, which was produced first by polymerization with maleic anhydride (MA) and vinyl acetate (VA) as raw materials under the protection of nitrogen and the constant temperature of 85℃ to obtain a alternating binary-polymer, then by amination with higher amine as aminating agent. The main functional groups of MV-a were characterized by IR analysis. The effects of reaction conditions on the properties of MV-a, including the molar ratio of monomers, reaction temperature, dosages of solvent and initiator, were investigated. The results showed that the reaction of alternating copolymer was feasible. The molar ratio of monomers had a great influence on the solidification point (SP) and cold filter plugging point (CFPP) depression for diesel fuel. The optimal molar ratio of VA to MA was 2. The influence sequence of above four factors was as follows: molar ratio of monomer＞reaction temperature＞dosage of solvent＞dosage of initiator. The MV-a was applied to three 0# diesel fuels from Zhangjiagang Petro-chemistry Company et al. The CFPPs of 0# diesel fuel were lowered 3 to 5℃. When MV-a was applied together with EVA-1, the CFPPs of 0# diesel fuels were lowered 3 to 9 ℃, indicating that the mixture of MV-a and EVA-1 was more useful than MV-a itself in improving the cold flowability of diesel fuel.