蜡
倾点
结晶
乙烯-醋酸乙烯酯
醋酸乙烯酯
材料科学
抑制剂
化学工程
Crystal(编程语言)
分子
有机化学
化学
复合材料
聚合物
共聚物
程序设计语言
工程类
药理学
医学
计算机科学
作者
Qibin Li,Xinyue Deng,Yang Liu,Qinglin Cheng,Chao Liu
标识
DOI:10.1016/j.molliq.2021.115816
摘要
Pour point depressant is one of the effective approaches to improve the low temperature fluidity of high-wax crude oil. Understanding the gelation of waxy oil on the pipe wall and the mechanism of pour point depressant is of great significance for the transportation of crude oil. In this work, molecular dynamics simulations were employed to investigate the effects of ethylene-vinyl acetate (EVA) on the gelation of the waxy oil at different temperatures (283 K, 293 K, 303 K and 313 K) and to get insight into the wax deposition on a micro-level. The results showed that the network structures of wax crystals formed at the solid wall with temperature of 283 K, 293 K and 303 K, which caused the gelation of waxy crude oil. The wax crystals tended to be arranged horizontally near the wall and vertically away from the wall surface. Actually, the crystallization of wax molecules can not be prevented by EVA. However, the pour point of oil system was reduced by the EVA which prevented the wax crystal deposition and changed the shape of wax crystal.
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