Crystallization risk of aromatic compounds in LNG production Part III: The solubility of o-xylene in methane down to cryogenic temperatures

IF 2.7 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2025-03-28 DOI:10.1016/j.fluid.2025.114434

Salem Hoceini, Marco Campestrini, Paolo Stringari

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Abstract

Following a series of works dealing with the experimental determination of the solubility limits of the BTEX components in methane rich-mixtures down to cryogenic temperatures, this work presents new measurements for the solubility of solid o-xylene in solvent methane. The measurements have been obtained using a static-analytic method that allows sampling of the fluid phase at equilibrium with the solid one at temperatures from 242 K down to 123 K and at nominal pressures of 3 and 6 MPa. Despite the importance of BTEX in assessing the risk of crystallization during the liquefaction of natural gas, the solubility of o-xylene in methane rich mixtures was not known in the literature before this work. As a consequence, these original data will give new insights into the solid-fluid equilibrium behaviour of the o-xylene + methane mixture down to LNG temperatures and then provide crucial information for the proper tailoring of the purification units upstream of the liquefaction unit. Measured solid-liquid and solid-vapor equilibria have been compared to the modelling results obtained by coupling a cubic equation of state and a model for the solid phase, and good agreement has been observed.

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液化天然气生产中芳香族化合物的结晶风险第三部分：邻二甲苯在甲烷中低温下的溶解度

在一系列关于BTEX组分在富甲烷混合物中低温下溶解度极限的实验测定之后，本工作提出了固体邻二甲苯在溶剂甲烷中的溶解度的新测量方法。测量结果是使用静态分析方法获得的，该方法允许在温度从242 K到123 K，公称压力为3和6 MPa的情况下，对流体相和固体相进行平衡取样。尽管BTEX在评估天然气液化过程中的结晶风险方面很重要，但在这项工作之前，在文献中还不知道邻二甲苯在富甲烷混合物中的溶解度。因此，这些原始数据将为邻二甲苯+甲烷混合物在液化天然气温度下的固流平衡行为提供新的见解，然后为液化装置上游净化装置的适当定制提供关键信息。实测的固液平衡和固气平衡已与三次状态方程和固相模型耦合得到的模拟结果进行了比较，结果吻合得很好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.