Hydrate phase equilibrium measurement of 50 mol.% carbon dioxide / 33 mol.% dimethyl ether / 17 mol.% propane in the presence of tetrahydrofuran, cyclopentane, tetra‑n‑butylammonium bromide, and tetra‑n‑butylammonium chloride

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Kai Guo, Sizhe Zhou, Wenxiang Zhang, Yonghuan Zang, Zhiqiang Ma, Zhihan Yang, Qing Xiao
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Abstract

Hydrate-based cold storage and refrigeration offer notable efficiency and safety advantages. By leveraging the high cold storage density of CO2 hydrate and the low phase equilibrium pressure and GWP of DME and C3H8 hydrates, a gas mixture hydrate (50 mol.% CO2, 33 mol.% DME, 17 mol.% C3H8) was used as a refrigerant for phase equilibrium assessment. Results showed phase equilibrium temperatures of 274.5 to 278.9 K at pressures from 0.4 to 0.86 MPa, aligning with conventional air conditioning pressures. Additives like THF, CP, TBAB, and TBAC improved conditions. Liquid promoters (THF, CP) increased temperatures by 4.5 to 7.9 K, while solid promoters (TBAB, TBAC) raised them by 5.3 to 11.1 K. Liquid promoters shifted the phase equilibrium curve for CO2-DME-C3H8 hydrate almost parallel to the right, while solid promoters steepened the curve slope. A predictive model was developed, showing good molar phase change enthalpy.

Abstract Image

在有四氢呋喃、环戊烷、四正丁基溴化铵和四正丁基氯化铵存在的情况下,对 50 摩尔二氧化碳/33 摩尔二甲醚/17 摩尔丙烷的水合物相平衡进行测量
水合物冷藏和制冷具有显著的效率和安全优势。利用 CO 水合物的高冷藏密度以及 DME 和 CH 水合物的低相平衡压力和 GWP,将混合气体水合物(50 mol.% CO、33 mol.% DME、17 mol.% CH)用作相平衡评估的制冷剂。结果显示,在 0.4 至 0.86 兆帕的压力下,相平衡温度为 274.5 至 278.9 K,与传统空调压力一致。THF、CP、TBAB 和 TBAC 等添加剂改善了条件。液体促进剂(THF、CP)将温度提高了 4.5 至 7.9 K,而固体促进剂(TBAB、TBAC)则将温度提高了 5.3 至 11.1 K。建立的预测模型显示了良好的摩尔相变焓。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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