Experimental and theoretical study on H2/CO2 separation by a five-step one-column psa process

Kim, Wang Gi; Yang, Jaeyoung; Han, Sang‐Sup; Cho, Chan-Hwi; Lee, Chang Ha; Lee, Hanju

doi:10.1007/bf02705851

Cited by 21 publications

(13 citation statements)

References 15 publications

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“…16,19 In addition, a new atomic signal was detected at 124.3 ppm, which is direct evidence for enclathrated CO 2 molecules. 20 Because the HQ clathrate has one type of cage similar to small (5 12 ) cages of the gas hydrate, CO 2 molecules captured in the clathrate show only one sharp signal at the chemical shift of 124.3 ppm. 21 Therefore, it can be said that H 2 does not react with HQ to form a clathrate compound, while CO 2 acts as a guest species in the HQ clathrates, at the experimental pressures used in this study.…”

Section: Resultsmentioning

confidence: 99%

“…However, novel technologies for gas separation have also been attracting attention, and various related experimental and simulation studies have been reported. 1,12,13 Another novel approach involving the use of clathrate compounds rather than conventional technologies (e.g., 16 They also verified the formation of HQ clathrates with various guests by spectroscopy. 17 In other work, Lee et al reported that ethylene can be separated from ethane + ethylene mixtures in a completely selective way using HQ clathrate as a kind of molecular sieve.…”

Section: Introductionmentioning

confidence: 96%

“…From the commercial point of view, the membrane technology is regarded as one of the most promising among various separation methods thus far. However, novel technologies for gas separation have also been attracting attention, and various related experimental and simulation studies have been reported. ,, …”

Section: Introductionmentioning

confidence: 99%

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Highly Selective CO₂ Extraction from a Mixture of CO₂ and H₂ Gases Using Hydroquinone Clathrates

et al. 2016

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The potential of hydroquinone (HQ) clathrates to selectively separate/capture CO2 from mixtures of CO2 and H2 gas is investigated. Selective CO2 enclathration within cages of a HQ framework, from mixtures of various concentrations of the two gases, are identified using 13C nuclear magnetic resonance (NMR) and Raman spectra. Spectroscopic results indicate that CO2 molecules from the gas mixture are exclusively accommodated into the cages of HQ clathrates and that the H2 molecules are thereby concentrated in the remaining gas phase. Quantitative evidence is presented by deconvolution of NMR peaks and an elemental analyzer that CO2 molecules can be captured into the clathrate compound even at the partial CO2 fugacity of 0.38 MPa in the gas mixtures tested. Storage capacity of 53–64.4 L of CO2/kg of HQ for the HQ clathrate with full conversion makes a HQ-clathrate-based process viable for pre-combustion CO2 separation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Highly Selective CO₂ Extraction from a Mixture of CO₂ and H₂ Gases Using Hydroquinone Clathrates

et al. 2016

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“…The advantage of this assumption is that the previously established model for a single-adsorbent bed (Kim et al, 1995;Yang et al, 1995Yang et al, , 1997 can be applied to a layered bed with a minor modification, and this approach can also be easily extended to the adsorption bed packed with more than two adsorbents. Using an axially dispersed plug flow and an ideal-gas law, the material balance for the bulk phase in the adsorption column is given by and the overall mass balance can be represented as follows:…”

Section: Mathematical Modelingmentioning

confidence: 98%

Adsorption dynamics of a layered bed PSA for H₂recovery from coke oven gas

1998

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“…In his study, an optimum purge quantity was determined in the process where the internal gas stream, instead of a part of a product stream, was utilized to purge the used bed. Recently, Lee and coworkers (Kim et al, 1995;Yang et al, 1995) studied the experimental and theoretical results of H 2 recovery from H 2 /CO and H 2 /CO 2 mixtures by a one-bed PSA process with zeolite 5A. In these studies, zeolite 5A was successfully used to obtain a hydrogen product of high purity.…”

Section: Introductionmentioning

confidence: 99%

Separation of Hydrogen Mixtures by a Two-Bed Pressure Swing Adsorption Process Using Zeolite 5A

Yang

Lee

Chang³

1997

Ind. Eng. Chem. Res.

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109

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A study on a two-bed six-step pressure swing adsorption (PSA) process using zeolite 5A was performed experimentally and theoretically for bulk separation of H2/CO and H2/CH4 systems (70/30 vol %) as major components in coke oven gas. When the pressure is cycled between 1 and 11 atm at ambient temperatures, 70% H2 in the feed could be concentrated to 99.99% in the product with a recovery of 75.87% in the H2/CO mixture and 80.38% in the H2/CH4 mixture. The effects of adsorption pressure, P/F ratio, adsorption/purge step time, and pressure equalization step time were investigated experimentally. If the product end of an adsorption bed was not contaminated during the adsorption and depressurizing pressure equalization steps, elongation of both the adsorption and purge steps gave good adsorbent productivity and recovery without any decrease in purity. Certain elongations of step time in the pressure equalization step resulted in a better performance of a PSA process. When the H2 mole fraction of effluent stream during the pressure equalization step was not high, the initial H2 purity of the adsorption step was not good because of the contamination of the product end section. These results were analyzed by a mathematical model incorporating heat and momentum balances.

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Experimental and theoretical study on H2/CO2 separation by a five-step one-column psa process

Cited by 21 publications

References 15 publications

Highly Selective CO₂ Extraction from a Mixture of CO₂ and H₂ Gases Using Hydroquinone Clathrates

Highly Selective CO₂ Extraction from a Mixture of CO₂ and H₂ Gases Using Hydroquinone Clathrates

Adsorption dynamics of a layered bed PSA for H₂recovery from coke oven gas

Separation of Hydrogen Mixtures by a Two-Bed Pressure Swing Adsorption Process Using Zeolite 5A

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Experimental and theoretical study on H2/CO2 separation by a five-step one-column psa process

Cited by 21 publications

References 15 publications

Highly Selective CO2 Extraction from a Mixture of CO2 and H2 Gases Using Hydroquinone Clathrates

Highly Selective CO2 Extraction from a Mixture of CO2 and H2 Gases Using Hydroquinone Clathrates

Adsorption dynamics of a layered bed PSA for H2recovery from coke oven gas

Separation of Hydrogen Mixtures by a Two-Bed Pressure Swing Adsorption Process Using Zeolite 5A

Contact Info

Product

Resources

About

Highly Selective CO₂ Extraction from a Mixture of CO₂ and H₂ Gases Using Hydroquinone Clathrates

Highly Selective CO₂ Extraction from a Mixture of CO₂ and H₂ Gases Using Hydroquinone Clathrates

Adsorption dynamics of a layered bed PSA for H₂recovery from coke oven gas