Hydrate-Based Separation for Industrial Gas Mixtures

天然气 气体分离 笼状水合物 化学 丙烷 三元运算 工业气体 分离过程 分数(化学) 燃料气 分馏 水合物 色谱法 热力学 燃烧 有机化学 生物化学 物理 涡轮机 计算机科学 程序设计语言
作者
Muhammad Naveed Khan,Pramod Warrier,Cornelis J. Peters,Carolyn A. Koh
出处
期刊:Energies [Multidisciplinary Digital Publishing Institute]
卷期号:15 (3): 966-966 被引量:12
标识
DOI:10.3390/en15030966
摘要

The removal of acidic gases and impurities from gas mixtures is a critical operation in the oil and gas industry. Several separation techniques, e.g., cryogenic fractionation, polymeric membranes, zeolites, and metal–organic frameworks, are employed to treat gas mixtures depending upon the nature of separation and contaminants present in the gas mixtures. However, removing N2, H2, H2S, and CO2 contents from industrial gas mixtures is a challenging step due to economic factors, high energy consumption, and effective separation. Hydrate-based separation for selective gas removal is a promising and efficient separation technique over a range of temperatures, pressures, and acidic gas contents. The enclathration of CO2, H2, N2, H2S, and other natural gas constituents effectively removes acidic gases and other contaminants from process gas streams. This work presents a novel process design to remove acidic gases and other contaminants from industrial waste gases and natural gas mixtures to achieve the desired selectivity in gas mixtures. Multi-phase equilibria calculations were also performed for various binary and ternary gas mixtures (e.g., CO2 + CH4, H2S + CH4, CO2 + N2, CH4 + CO2 + H2S, and CO2 + H2S + N2) over a range of compositions and T, P conditions. The former calculations established the suitable region in terms of temperature and pressure for adequate separations. To determine the optimal process conditions (T & P) for efficient separation, fractional cage occupancy and gas mole fraction in each phase were also computed. A detailed analysis of the hydrate-based separation shows that the number of stages necessary for desired separation efficiency depends on the nature of the gas mixture and hydrate stability.

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