Adsorption dynamics of a layered bed PSA for H{sub 2} recovery from coke oven gas
- Yonsei Univ., Seoul (Korea, Republic of). Dept. of Chemical Engineering
The adsorption dynamics of a layered bed packed with activated carbon and zeolite 5A were studied experimentally and theoretically through breakthrough experiments and two-bed pressure swing adsorption (PSA) processes by using coke oven gas (56.4 vol.% H{sub 2}; 26.6 vol.% CH{sub 4}; 8.4 vol.% CO; 5.5 vol.% N{sub 2}; and 3.1 vol.% CO{sub 2}). The results of breakthrough curves of a layered bed showed an intermediate behavior of those of zeolite-5A bed and activated carbon bed, because each concentration front propagates with its own wavefront velocity in each layer by a different adsorption equilibrium. Since a fast and dispersed mass-transfer zone of CO in the zeolite layer of a layered bed leads to a long leading front of the N{sub 2} wavefront, controlling the leading wavefront of the N{sub 2} plays a very important role in obtaining a high-purity product and in determining the optimum carbon ratio of a PSA process for H{sub 2} recovery from coke oven gas. The layered bed PSA process was simulated in a simplified form of two single-adsorbent beds linked in series. The dynamic model incorporating mass, energy, and momentum balances agreed well with the experimental data. Concentration profiles inside the adsorption bed were also investigated.
- OSTI ID:
- 653302
- Journal Information:
- AIChE Journal, Journal Name: AIChE Journal Journal Issue: 6 Vol. 44; ISSN AICEAC; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
Similar Records
Separation of hydrogen mixtures by a two-bed pressure swing adsorption process using zeolite 5A
Performance analysis of four-bed H{sub 2} PSA process using layered beds