Study on synthesis and complexing properties of depressant for high pour point crude oil

Suitable fatty alcohols were determined by component analysis of crude oil and the susceptibility of waxy crude oils to pour point depressant, higher alcohol acrylates were synthesized from acrylic acid and higher alcohol(C₁₈~C₂₂). Alcohol acrylate polymer (AM), alcohol acrylate-vinyl acetate copolymer (AMV) and alcohol acrylate-vinyl acetate-styrene(AVS)were synthesized as depressants for Weigang crude oil. AVS was chosen as the best one by testing the ability of depressing the pour point of crude oil, the synthetic condition of the three- monomer copolymer AVS were discussed by orthogonal test, and auxiliary agent EVA2 was screened out by depression efficiency and wax prevention. The results showed that the optimal synthetic conditions of AVS were as follows: the best molar ratio of alcohol acrylate, vinyl acetate and styrene was 1:1:0.5, the dosage of initiator was 1.2%, the monomer concentration of the reaction was 30% and the reaction time was 7h. The complex (CPR) with combination mass ratio of 1:2 of AVS and EVA could reduce pour point for Weigang crude oil by 10℃ at amount of 0.5%, paraffine removing rate is as much as 40.62% with 0.3% CPR.