Synergistic effect of modified ethylene-vinyl acetate and asphaltenes on improving the flow properties of model oil

IF 6 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science Pub Date : 2025-02-01 DOI:10.1016/j.petsci.2024.09.025

Yang Liu , Zheng-Nan Sun , Guo-Lin Jing , Yi-Hai Yang , Hui Jiang , Xiao-Yan Liu

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引用次数: 0

Abstract

The effect of alcoholic polyethylene-vinyl acetate (EVA) product ethylene-vinyl alcohol copolymer (EVAL) on the low-temperature flow properties of model oil containing asphaltene (ASP) was investigated. The change of wax crystal microscopic morphology of model oil before and after modification were examined, and the influence of asphaltene mass fraction on the rheological improvement effect of EVAL was analyzed. The composite system of EVAL and asphaltene significantly reduced the pour point, gel point, apparent viscosity, storage modulus and loss modulus of waxy oil at low temperatures. When the EVAL concentration is 400 ppm and the asphaltene mass fraction is 0.5 wt%, the synergistic effect of the two is optimal, which can reduce the pour point by 17 °C and the modulus value by more than 98%. The introduction of EVAL strengthens the interaction between asphaltenes and wax crystals, forming EVAL-ASP aggregates, which promote the adsorption of wax crystals on asphaltenes to form composite particles, and the polar groups prevent the aggregation of wax crystals and reduce the size of wax crystals, thus greatly improving the fluidity of waxy oils.

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改性乙烯-醋酸乙烯酯与沥青质的协同作用对模型油流动性能的改善

研究了醇性聚乙烯-醋酸乙烯酯（EVA）产物乙烯-乙烯醇共聚物（EVAL）对含沥青烯（ASP）模型油低温流动性能的影响。考察了改性前后模型油蜡晶微观形貌的变化，分析了沥青质质量分数对EVAL流变改性效果的影响。EVAL与沥青烯的复合体系在低温下显著降低了蜡质油的凝点、凝胶点、表观粘度、储存模量和损失模量。当EVAL浓度为400 ppm，沥青质质量分数为0.5 wt%时，两者的协同效果最佳，可使浇注点降低17℃，模量值降低98%以上。EVAL的引入加强了沥青质与蜡晶之间的相互作用，形成EVAL- asp聚集体，促进蜡晶在沥青质上吸附形成复合颗粒，极性基团阻止蜡晶聚集，减小蜡晶尺寸，从而大大提高了蜡油的流动性。

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来源期刊

Petroleum Science 地学-地球化学与地球物理

CiteScore

7.70

自引率

16.10%

发文量

311

审稿时长

63 days

期刊介绍： Petroleum Science is the only English journal in China on petroleum science and technology that is intended for professionals engaged in petroleum science research and technical applications all over the world, as well as the managerial personnel of oil companies. It covers petroleum geology, petroleum geophysics, petroleum engineering, petrochemistry & chemical engineering, petroleum mechanics, and economic management. It aims to introduce the latest results in oil industry research in China, promote cooperation in petroleum science research between China and the rest of the world, and build a bridge for scientific communication between China and the world.