Hydrate equilibrium conditions of a synthetic natural gas in the presence of methanol: Experimental study and thermodynamic modeling

IF 2.7 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2025-09-24 DOI:10.1016/j.fluid.2025.114595

Alireza Shariati , Ali Rasoolzadeh , Cor J. Peters

引用次数: 0

Abstract

In this work, the hydrate equilibrium conditions of a synthetic natural gas (SNG) in the presence of pure water and three aqueous methanol solutions including 0.09570, 0.24805, and 0.50109 methanol mass fractions were measured in the pressure range of (5.06 to 12.56) MPa and temperature range of (256.74 to 291.41) K using the isochoric pressure-search method. Additionally, a modified van der Waals-Platteeuw (vdW-P) model was used to calculate the hydrate equilibrium conditions of the SNG hydrate. The UNIQUAC and Flory-Huggins (FH) activity coefficient models were applied to compute the water activity in the presence of methanol and the Peng-Robinson equation of state (PR EoS) was used for the vapor phase. It was determined that (vdW-P + PR + UNIQUAC) and (vdW-P + PR + FH) resulted in the average absolute deviations of 0.41 K and 0.25 K, respectively.

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甲醇存在下合成天然气水合物平衡条件：实验研究和热力学模型

在压力（5.06 ~ 12.56）MPa、温度（256.74 ~ 291.41）K范围内，采用等时压力搜索法测定了合成天然气（SNG）在纯水、甲醇质量分数（0.09570、0.24805、0.50109）三种甲醇水溶液存在下的水合物平衡条件。此外，采用改进的van der Waals-Platteeuw （vdW-P）模型计算了天然气水合物的水合物平衡条件。采用UNIQUAC和Flory-Huggins （FH）活度系数模型计算甲醇存在时的水活度，采用Peng-Robinson状态方程（PR EoS）计算气相。结果表明，（vdW-P + PR + UNIQUAC）和（vdW-P + PR + FH）的平均绝对偏差分别为0.41 K和0.25 K。

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.