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Phase behavior of asphaltenes + organic diluents

机译：沥青+ +有机稀释剂的相行为

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摘要

Asphaltenes, defined operationally on the basis of ASTM standards that include mixing and macroscopic filtration steps, are typically asserted to be soluble in toluene [1]. A similar definition is used to classify organic diluents as solvents and non-solvent for asphaltenes. In the analysis of phase separation mechanisms of asphaltenes from hydrocarbon media, the assumption of solubility in the original medium is a key one. From a solution thermodynamics standpoint, dissolution of a solid into a liquid includes the enthalpy of transition to liquid for the solute plus the enthalpy associated with homogeneous mixing at a molecular level [2]. The present work challenges the application of the concept of solubility to mixtures of asphaltenes with organic diluents and suggests an alternative explanation for the behavior of asphaltenes in organic liquids based on thermodynamic measurements.
机译：基于包括混合和宏观过滤步骤的ASTM标准，在操作上定义的沥青质通常被断言可溶于甲苯[1]。类似的定义用于将有机稀释剂分类为沥青质作为溶剂和非溶剂。在从烃介质的沥青质的相分离机制分析中，原始介质中的溶解度的假设是键。从解决方案热力学的角度来看，固体溶解到液体中包括过渡到溶液的液体焓加，加上分子水平在均匀混合相关的焓[2]。目前的工作挑战溶解度概念与有机稀释剂的沥青质混合物的应用，并表明基于热力学测量的有机液体中沥青质行为的替代解释。

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