Abstract: A pour point depressant (PA-EVA) was prepared by using ethylene-vinyl acetate copolymer (EVA) and higher alcohol acrylate (PA) as raw materials. Its effect and mechanism on Nanyang crude oil were studied. The effect of pour point depressant on non-isothermal crystallization behavior of wax was investigated by differential scanning calorimetry (DSC). Results showed that the nucleation of PA-EVA increases the peak crystallization temperature and enhances the crystallization rate of the wax. PA-EVA improves the flow ability of crude oil by increasing the wax crystal geometry size, reducing the coating of liquid oil.

Key words: ethylene-vinyl acetate copolymer, higher alcohol polyacrylic acid, DSC, non-isothermal crystallization behavior