Study Of Dieesel Oil Wax Crystal Disperse Assistant

The long chain n-alkane will precipitate in form of wax crystal at low temperature, to plug catheter and filter, which would disturb diesel engine system because of lack of diesel oil. It is necessary to take measures to decrease diesel oil solidification point, improve low-temperature flowing. Diesel cold flow improver is a kind of common diesel additives in diesel production. Wax alkane in diesel will precipitate by small crystal when cold flowing improvers are added to diesel, which keeps diesel oil flowing in low-temperature. It is convenience for storage, transportation and use. The researches to prepare cold flow improvers with better application effect are very significant.Firstly, we synthesized the diesel low-temperature flowing improver which rigid structure monomer copolymerized with, studied the impact of diesel cold filter plugging point with the changes of branched chain, polymerization reaction condition, rigid structure monomer's quantity and monomers respectively, dicycropentadiene—maleic ester(amide)—styrene tripolymer can improve the diesel cold filter plugging point effectively, and amide is better than ester. The change of reaction condition leads to the change of main chain molecule weight, and acrylic ester is better than other monomers. Secondly, we designed and synthesized pentaerythritol ester, long chain alkyl amide and paratert—butyl benzamide, three kinds of small molecule wax crystal disperse assistant. The hybrid of paratert—butyl benzamide mixed with T1804C could decreased the cold filter plugging point of Shijiazhuang 0# diesel oil by 3℃to 9℃. Finally, we duplicate matched tripolymer with T1804B, studied the decreasing cold filter plugging point effect of mixture, the impact of additive quantity and the relationship between n-alkane in test diesel and cold filter plugging point. Mixture is better than single additive universally. The quantity of additive is determined by working curves of certain diesel and additive.