富马酸十六醇酯-苯乙烯二元共聚物柴油低温流动改进剂的合成、表征及性能评价(英文)

Synthesis and characterization of dihexadecyl fumarate-styrene copolymer as a cold flow improver for diesel fuel

以富马酸和十六醇为原料、对甲苯磺酸为催化剂、对苯二酚为阻聚剂、甲苯为溶剂,采用直接酯化法制备了富马酸十六醇酯单体(DHF);以富马酸十六醇酯和苯乙烯为聚合单体、过氧化苯甲酰为引发剂,通过自由基聚合制备了富马酸十六醇酯-苯乙烯二元共聚物(FOS)。用IR、1H-NMR对DHF单体及FOS共聚物进行了表征,分析了张家港0#柴油和胜利海科5#柴油的正构烷烃分布,考察了共聚物的降滤效果,讨论了降滤作用机理。结果表明,当添加剂量为0.1%时,FOS能使张家港0#柴油冷滤点降低6℃,胜利海科柴油5#柴油冷滤点降低3℃;FOS对不同柴油表现出了不同的感受性;与2种商业降凝剂复配后,表现出良好的协同效应,作为商业降凝剂的优良助剂,FOS具有一定的应用前景。

Dihexadecyl fumarate-styrene copolymer（FOS）was synthesized by solution free radical copolymerization with benzoyl peroxide as the initiator.The monomer dihexadecyl fumarate（DHF）was obtained by direct esterification of fumaric acid and hexadecyl alcohol using paratoluenesulfonic acid as catalyst,hydroquinone as polymerization inhibitor and toluene as solvent.FOS obtained was then evaluated as a cold flow improving agent for diesel fuel.Zhangjiagang 0^# diesel and Shengli Haike 5^# diesel were used.The structures of monomer and copolymer were characterized by IR and ^1H-NMR and the composition of diesel oils was analyzed by gas phase chromatography.The effects of FOS on the cold filter plugging point（CFPP）and the depression mechanism were then investigated.The results indicated that the copolymer FOS obtained in this work can be used as the cold flow improver for diesel fuel.The CFPP values of Zhangjiagang 0# diesel and Shengli Haike 5# can be depressed by 6℃ and 3℃,respectively,by adding 0.1% FOS in the diesel oils.The sensitivity of FOS as cold flow improver may vary for different diesel products.When mixed with two kinds of commercial cold flow improvers,FOS exhibits excellent performance and good application prospects as the diesel oil additive.