降凝剂对原油中蜡非等温结晶行为的影响

以乙烯-醋酸乙烯酯共聚物(EVA)和聚丙烯酸高碳醇酯(PA)为主要原料，制备了一种高凝原油降凝剂（PA-EVA），采用差示扫描量热法研究了降凝剂的添加对原油中蜡的非等温结晶动力学的影响。结果表明：PA-EVA降凝剂起到了异相成核作用，使蜡的结晶峰温升高，结晶速率增大；PA-EVA降凝剂通过增大蜡晶几何尺寸，减少了对液态油的包覆，从而改善原油的流动性。

EFFECT OF POUR POINT DEPRESSANT ON NON-ISOTHERMAL CRYSTALLIZATION BEHAVIOR OF WAX IN CRUDE

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.