Separation of hydrogen mixtures by a two-bed pressure swing adsorption process using zeolite 5A
- Yonsei Univ., Seoul (Korea, Republic of). Dept. of Chemical Engineering
- Sunkyong Engineering and Construction Ltd., Seoul (Korea, Republic of)
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 H{sub 2}/CO and H{sub 2}/CH{sub 4} 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% H{sub 2} in the feed could be concentrated to 99.99% in the product with a recovery of 75.87% in the H{sub 2}/CO mixture and 80.38% in the H{sub 2}/CH{sub 4} 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 H{sub 2} mole fraction of effluent stream during the pressure equalization step was not high, the initial H{sub 2} 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.
- OSTI ID:
- 529753
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 36, Issue 7; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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