Experimental study of phase transitions in the CO2 + (Butylcyclohexane + Toluene + Eicosane) system under high-pressure conditions

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2025-05-20 DOI:10.1016/j.fluid.2025.114474

Willam Paul Trujillo Vera, Hugo Andersson Dantas Medeiros, Filipe Xavier Feitosa, Hosiberto Batista de Sant’Ana

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Abstract

The phase behavior of the multicomponent system CO₂ + (butylcyclohexane + toluene + eicosane) was experimentally investigated to improve the understanding of fluid-fluid and fluid-solid equilibria under high-pressure conditions. Phase transitions were observed using a high-pressure PVT equilibrium cell across a CO₂ global composition range from 20.10 mol % to 94.90 mol %, within a temperature range of 286 K–333 K and pressures up to 22.30 MPa. The study identified different phase equilibria, including liquid-liquid (LL), liquid-liquid-solid (LLS), liquid-solid (LS), liquid-liquid-vapor (LLV), and liquid-vapor (LV) equilibria. These transitions were measured through constant composition expansion (CCE) experiments using a visual synthetic static method. The results emphasize the complexity introduced by multicomponent interactions, showing how long-chain paraffins and cyclic hydrocarbons influence CO₂ solubility in aromatic hydrocarbons. Overall, the findings provide important insights into phase behavior, relevant for enhanced oil recovery (EOR) and carbon capture, utilization, and storage (CCUS), and contribute to improving predictive thermodynamic models.

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高压条件下CO2 +（丁基环己烷+甲苯+廿烷）体系相变的实验研究

通过实验研究了CO₂+（丁基环己烷+甲苯+二十烷）多组分体系在高压条件下的相行为，以提高对流-流平衡和流-固平衡的认识。采用高压PVT平衡池，在CO₂总成分20.10 ~ 94.90 mol %范围内，温度范围为286 K ~ 333 K，压力高达22.30 MPa，观察到相变。研究确定了不同的相平衡，包括液-液（LL）、液-液-固（LLS）、液-固（LS）、液-液-汽（LLV）和液-汽（LV）平衡。这些转变是通过恒定成分膨胀（CCE）实验，使用视觉合成静态方法来测量的。结果强调了多组分相互作用带来的复杂性，显示了长链烷烃和环烃如何影响CO 2在芳烃中的溶解度。总的来说，这些发现为提高原油采收率（EOR）和碳捕集、利用和封存（CCUS）提供了重要的相行为见解，并有助于改进预测热力学模型。

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.