Thermodynamic insights into H2O-D2O separation via gas hydrate formation with HFC134a

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL Fluid Phase Equilibria Pub Date : 2024-12-13 DOI:10.1016/j.fluid.2024.114312

Sai Kiran Burla, Seong Deok Seo, Jihoon Han, Ju Dong Lee

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引用次数: 0

Abstract

This study investigates the thermodynamic phase behavior of mixed H₂O and D₂O systems using HFC134a gas hydrates, focusing on the potential for separating D₂O from H₂O. Hydrate formation and dissociation experiments were conducted on pure H₂O, D₂O, and their 50:50 vol% mixtures. Phase equilibrium data were obtained using the isochoric pressure-volume-temperature (PVT) method, and the Clausius-Clapeyron equation was applied to calculate dissociation enthalpies. The results revealed distinct differences in hydrate stability, with D₂O hydrates forming at lower pressures and higher temperatures than H₂O. The mixed system exhibited intermediate thermodynamic properties, reflecting the influence of both H₂O and D₂O within the hydrate. The dissociation enthalpy for H₂O+HFC134a is approximately 131.85 kJ/mol, while D₂O+HFC134a is about 167.28 kJ/mol. The dissociation enthalpy for the mixed hydrate is approximately 145.23 kJ/mol indicating an increase of about 10.14 % compared to H₂O+HFC134a and a decrease of approximately 13.18 % compared to D₂O+HFC134a. These findings highlight the potential for using HFC134a hydrates as an effective method for D₂O and H₂O separation, with future work aiming to explore their thermodynamic regimes and optimize experimental conditions for feasible separation.

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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.