| Diesel pour point is a commonly used additives in diesel production,known as diesel cold flow improver. diesel pour point has a obvious effect, for example: increase refinery diesel production, increase production flexibility and diesel:gasoline. Currently diesel pour point have been widely uesd in the industry, Abroad have been widely used diesel flow improver.This thesis have benn completed the following work:(1)Sulfuric acid supported on activated carbon catalyst was prepared as catalyst of synthesis of acrylate. The results showed that:The best preparative conditions of sulfuric acid supported on activated carbon catalyst is activation 6h at 160℃, dipped in 20% H2SO4 for 20h, among C(g):H2SO4(ml)=1:6, drying after filtration at 110℃.The yield of acrylate could reach 93.2%.(2)The acrylate-styrene-maleic anhydride aminolysis diesel depressant was synthesized,having the effect of depressing pour point and cold filter plugging point.The acrylate-styrene-maleic anhydride copolymer was synthesized in the proper ration of monomers 9:1:1,quantity of benzoyl peroxide 0.6%(based on the mass of monomers),reaction temperature 90℃,reaction time 8h. Based on p-toluenesulfonic acid as catalyst,pour point depressant was synthesized with copolymer and 18 amines.When the addition of the pour point depressant was 0.15%(mass fraction,following the same) of diesel,pour point and cold filter plugging point of three kinds of diesel oil which was produced by PetroChina Lanzhou Petrochemical Company,was dropped by 18℃,10℃,10℃and decreased by 2℃,3℃,2℃respectively.Pour point depressant had a good effect of decreasing pour point and some effect of depressing cold filter plugging point.
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