Abstract

In this study, n-hexane-asphaltenes (X–A) and n-heptane-asphaltenes (P–A) were separated and collected by n-hexane and n-heptane respectively. The two asphaltenes were divided into six subfractions (A1–A6) by the mixed solvent (toluene/n-hexane or toluene/n-heptane). The differences between X–A and P–A were studied and the differences between subfractions were compared. And the effects of X–A, P–A and subfractions on oil-water interfacial tension (IFT) were evaluated. The content and polarity of X–A are greater than that of P–A. The ability of X–A reducing oil/water IFT is stronger than that of P–A. The structures of X–A and P–A were simply speculated by the improved B–L method (Bitumen–Liquid product method is used to calculate structural parameters). Both P–A and X–A are cata-condensed and they are mainly tricyclic-aromatics. Moreover, X–A is a kind of high condensation aromatic polymer with regular arrangement, short alkyl chains, low rigidity and more naphthenic rings. P–A is a kind of high condensation aromatic polymer with poor arrangement regularity, long alkyl chains, large rigidity, more aromatic rings but slightly less condensation degree than X–A.

中文翻译：

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正己烷和正庚烷-沥青质的结构特征和界面性质

摘要

在本研究中，正己烷-沥青质 (X-A) 和正庚烷-沥青质 (P-A) 分别通过正己烷和正庚烷进行分离和收集。两种沥青质通过混合溶剂（甲苯/正己烷或甲苯/ n-庚烷）。研究了 X-A 和 P-A 之间的差异，并比较了亚组分之间的差异。并评估了 X-A、P-A 和亚组分对油水界面张力 (IFT) 的影响。X-A的含量和极性大于P-A。X-A降低油水IFT的能力强于P-A。X-A 和 P-A 的结构通过改进的 B-L 方法简单推测（沥青-液积法用于计算结构参数）。P-A 和 X-A 都是催化缩合的，它们主要是三环芳烃。此外，X-A是一种排列规则、烷基链短、刚性低、环烷环较多的高缩合芳烃聚合物。P-A是一种高缩合芳族聚合物，排列规则性差，烷基链长，刚性大，