乙烯–醋酸乙烯酯–乙烯醇三元共聚物的制备及其在原油中的降凝降黏研究
Preparation of Ethylene-vinyl acetate-vinyl Alcohol Copolymer (HEVA) and Its Properties of Pour Point Depression and Viscosity Reduction in Crude Oil

DOI: 10.12677/JOGT.2019.411011, PP. 56-62

Keywords: 三元共聚物，原油，降凝剂，凝固点，降黏率
Terpolymer, Crude Oil, Pour Point Depressant, Freezing Point, Viscosity Reduction Rate

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Abstract:

以聚乙烯–醋酸乙烯酯为原料，KOH/异丙酮溶液为水解催化剂，制备了乙烯–醋酸乙烯酯–乙烯醇三元共聚物(HEVA)。利用红外光谱和核磁共振氢谱对水解产物进行了结构表征，探讨了水解产物对易凝原油的降凝降黏性能，并与市售乙烯–醋酸乙烯酯共聚物(EVA)和乙烯–甲基丙烯酸酯共聚物(EM)的降凝降黏效果进行了比较。研究结果表明，HEVA的降凝降黏效果明显优于市售产品。针对凝固点为25℃的原油，HEVA最大降凝幅度为11.5℃，25℃时的降黏率为66.9%，50℃时的降黏率为47.6%。
Ethylene-vinyl acetate-vinyl alcohol copolymer (HEVA) was synthesized by using ethylene-vinyl acetate copolymer (EVA) as starting materials, and KOH/isopropyl ketone solution as hydrolysis catalyst. The hydrolysis product was characterized by using combined techniques including IR spectroscopy and 1H-NMR. Pour point depression and viscosity reduction of crude oil were studied. Moreover, some available pour depressants were compared, such as ethylene-vinyl acetate copolymer (EVA) and ethylene-methacrylate copolymer (EM). The result shows that the hydrolysis copolymer is superior to these available pour depressants. When freezing point of the crude oil is 25？C, the maximum depression amplitude is 11.5？C. Viscosity reduction rate is 66.9% at 25？C, and it is 47.6% at 50？C.

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