Be careful with the gas hydrate equilibrium data measured by stirred autoclave

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2025-01-30 DOI:10.1016/j.fluid.2025.114357

Litao Chen , Jiansheng Luo , Pengcheng Jing , Wang Ma , Hongtao Liu , Changhong Yu

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Abstract

Equilibrium data, one of the essential fundamental data of gas hydrate, is always needed in its prevention and utilization. In this work, a total of 111 sets of hydrate equilibrium data for CO₂-containing natural gas in alcohol/salt solutions were measured in a stirred autoclave or rocking cell by using the isochoric pressure searching method. Some equilibrium data failed in the thermodynamic consistency test. It is speculated, after the hydrate formation and dissociation in the insufficiently stirred autoclave, the last hydrate crystal could be in equilibrium with concentrated or diluted solutions which are different from the initial solution. Fake equilibrium data could be reported. The gas hydrate equilibrium data in some solutions were remeasured in a rocking cell apparatus. All the rocking cell measured equilibrium data passed the thermodynamic consistency test. It seems stirred autoclave are likely to report fake gas hydrate equilibrium data, while rocking cell may be more reliable.

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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.

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