Adsorption-based separation of refrigerant blends using ZIF-7 and ZIF-8: Isothermal high-pressure gravimetric sorption measurements

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2025-04-17 DOI:10.1016/j.fluid.2025.114449

Gensheng Lin , Xiaoxian Yang , Ehsan Sadeghi Pouya , Eric F. May , Markus Richter

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Abstract

A high-pressure gravimetric sorption analyzer incorporating a magnetic suspension balance was set up for simultaneous density and sorption measurements in the temperature range of (273.15–368.15) K and pressures up to 15 MPa. The reliability of the apparatus was first examined by density measurements of four pure gases (nitrogen, carbon dioxide, argon, and methane) at temperatures of (283.15–333.15) K with pressures up to 12 MPa. The expanded uncertainties (k = 2) were estimated to be 60 mK for temperature, 0.2 or 3.0 kPa for pressure, and 0.1 % for pure fluid density determination. The density data measured with the newly commissioned apparatus were compared to values calculated with reference equations of state as implemented in the NIST REFPROP database version 10.0, with relative deviations mostly within 0.1 % after calibration. The apparatus was further validated through methane sorption measurements on ZIF-7, showing excellent agreement with data obtained from another well-calibrated gravimetric adsorption analyzer that has been extensively used for accurate measurements. Following this validation, the adsorption of six pure refrigerant gases (R-32, R-125, R-1234yf, R-134a, R-1234ze(E), and R-290) on ZIF-7 and ZIF-8 was studied to explore their potential for refrigerant blend separation (e.g., R-410A and R-513A). The results indicate that ZIF-8 could effectively separate R-32 from R-410A, while ZIF-7 has the potential to separate both R-32 from R-410A and R-1234yf from R-513A.

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基于吸附的分离制冷剂混合物使用ZIF-7和ZIF-8：等温高压重力吸附测量

在温度为（273.15-368.15）K、压力为15 MPa的条件下，建立了含磁悬浮天平的高压重力吸附分析仪，可同时进行密度和吸附测量。仪器的可靠性首先通过密度测量四种纯气体（氮气，二氧化碳，氩气和甲烷）在温度（283.15-333.15）K和压力高达12兆帕。扩展不确定度（k = 2）估计温度为60 mK，压力为0.2或3.0 kPa，纯流体密度测定为0.1%。用新投入使用的仪器测量的密度数据与NIST REFPROP数据库10.0版本中实现的参考状态方程计算的值进行了比较，校正后的相对偏差大多在0.1%以内。该仪器通过ZIF-7上的甲烷吸附测量进一步验证，与另一种校准良好的重量吸附分析仪获得的数据非常吻合，该分析仪已广泛用于精确测量。在此验证之后，研究了六种纯制冷剂气体（R-32, R-125, R-1234yf, R-134a, R-1234ze(E)和R-290）在ZIF-7和ZIF-8上的吸附，以探索它们对制冷剂混合分离（例如R-410A和R-513A）的潜力。结果表明，ZIF-8能有效分离R-32和R-410A，而ZIF-7能同时分离R-32和R-410A，同时分离R-1234yf和R-513A。

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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.