Abstract
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.
Highlights
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The hydrate phase equilibria for gas separation were calculated using the van der Waals and Platteeuw model coupled with the Gibbs energy minimization (GEM)
Behzad et al (2019) [35] conducted the experimental investigation to identify the impact of pressure on the separation of CH4 from CH4 + CO2 gas mixtures
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Depending on the composition of the gas mixture and the desired separation efficiency, different techniques can be employed to separate the mixture components. The high concentration of gases stored in hydrate in hydrate cages and the ability to tune cage occupancy by changing temperature cages and the ability to tune cage occupancy by changing temperature or pressure or pressure provides a novel method for gas separation [8,18,19,20,21,22,23,24]. Subjecting the gas mixture plus water to hydrate formation and dissociation steps. In addition,Inthe currentthe work critically investigates the tigates the effectiveness of a hydrate-based gas separation process.
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