倍半硅氧烷/改性乙烯-乙酸乙烯酯共聚物复配降凝剂对蜡油倾点的影响

Effect of Silsesquioxane/Modified Ethylene-VinylAcetate Copolymer Compounded Pour PointDepressant on Pour Point of Waxy Oil

乙烯-乙酸乙烯酯共聚物(EVA)是原油常用的降凝剂(PPDs),但其分子结构相对比较单一,对部分油品降凝效果不佳。为了提高EVA的降凝效果,使用硬脂酰氯与羟基化的EVA直接反应的方法制备烷基长链接枝改性EVA,并与带有烷基长链的倍半硅氧烷(SS)纳米粒子进行复配。研究了改性EVA和SS复配降凝剂对蜡油的降凝效果和降凝机理。结果表明:复配降凝剂为蜡提供晶核,使蜡晶变小并降低蜡的沉淀量,导致蜡油中形成的蜡晶难以搭接在一起,形成了松散的结构,当复配质量比m(EVA-g)∶m(SS-L)=1∶2时,在蜡油中的质量分数为0.1%时,蜡油倾点降低了25℃。

Ethylene-vinyl acetate copolymer(EVA)is a commonly used pour point depressants(PPDs)for crude oil,but its molecular structure is relatively simple and it has poor pour point depressing effect on some oils.In order to enhance its effect on pour point,long alkyl side chain modified EVA was prepared by a simple method of direct reaction of stearoyl chloride with hydroxylated EVA,and was compounded with alkyl long-chain silsesquioxane nanoparticles(SS).The pour point depressant effect and the mechanism of modified EVA and SS compound pour point depressants on wax oil were studied.The compounded pour point depressant provides crystal nuclei for the wax,making the wax crystals smaller and difficult to overlap and reducing the amount of wax precipitation.When the compounding ratio is m(EVA-g)∶m(SS-L)=1∶2 and the mass fraction in wax oil is 0.1%,the pour point is reduced by 25℃.