Synthesis And Properties Of Comb Polymer As Pour Point Depressant

In view of crude oils of Sudan 3/7 areas' character of high paraffin,high asphaltum,high solidification point and the mechanism of depressing pour point,a series of comb copolymer was synthesized and characterized by infrared(IR).Factors to influence pour point were also investigated.The concrete content is as follows1.Nonyl phenol and formaldehyde were used as a raw material to prepare linear polymer phenolics.Optimum technic conditions were obtained as follows:Zinc acetate as catalyst,PH= 4-7,T=85℃,t=4h,nonyl phenol versus formaldehyde =1:1.5(mol).2.Factors to influence production rate of esterification were investigated.And optimum technic conditions were obtained as follows:acrylacid versus Octadecanol=1:1.5(mol);the content of toluene sulfonic acid is 0.7wt%;the content of hydroquinonequality is 0.4wt%;T=120℃;t= 4h.Under experimental conditions,the esterification production rate may reach above 93%.3.A series of comb polymers was synthesized as follows:Phenolics-Ethylene carbonate graft copolymer(A),the Phenolicsstem—1,3-Propane sultone graft copolymer(B),Maleic anhydride -Octadecyl acrylate bipolymers(C),Maleic anhydride-Styrene-Octadecyl acrylate(D),Maleic anhydride-Styrene-Acrylamide ester(E).The efficiency of depressing pour point was also studied.Results showed that the efficiency of A,B to depress pour point was bad,only 0～1℃, E was the best,achieving 6.5℃.4.The factors of comb polymer segment distribution,hydrophobic chain,the content of initiator, polymerization temperature,polymerization time,the content of PPD,and crude oil post-processing temperature to depress pour point were investigated.With the increases of hydrophobic chain,the efficiency of depressing pour point became better.With the increases of polymerization temperature and time,the efficiency of depressing pour point became better, finally tended to stable.5.Optimum technics conditions for C,D and E were obtained as follows:Maleic anhydride: Octadecyl acrylate=1:3(mol),the content of initiator is 0.5wt%,T=105℃,t=4h for C;Maleic anhydride:Styrene:Octadecyl acrylate =2:1:6(mol),the content of initiator is 0.7wt%,T=100℃,t=6h for D;Maleic anhydride:Styrene:Acrylamide=6:1:2(mol),the content of initiator is 0.6wt%,T=100℃,t=8h.for E,repectively.