Comparison of adsorption dynamics in kinetic and equilibrium beds in hydrogen ternary system

Min Bae Kim, Youn Sang Bae, Hyungwoong Ahn, Chang Ha Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The adsorption dynamics of a ternary hydrogen mixture (H 2/CH4/CO; 59.3/30.5/10.2 vol%) in a carbon molecular sieve (CMS) bed were compared experimentally and theoretically with fixed beds by using activated carbon, zeolite 5A, and oxidized CMS. The breakthrough experiments were performed in the range of 4-16 kgf/cm2 adsorption pressure and 4.5-9.1 LSTP (liter at standard temperature and pressure)/min feed flow rate. In the CMS bed regenerated at high temperature (548 K), the adsorption dynamics were similar to those in the activated carbon bed in terms of both breakthrough curves and temperature excursions due to the pore enlargement of the CMS regenerated at high temperature. Therefore, the effect of kinetic separation on the adsorption dynamics was not observed. However, in the CMS bed regenerated at low temperature (423 K), CH4 showed a breakthrough earlier than CO, owing to the sieving effects on the CMS, and CO showed the wide mass transfer zone. To understand the adsorption characteristics and the thermal effects by the heat of adsorption, a nonisothermal dynamic model incorporating mass, energy, and momentum balances was applied to the adsorption dynamics in the kinetic and equilibrium separation beds. Moreover, the kinetic effects on the adsorption dynamics also were studied by using a constant or variable diffusivity model.

Original languageEnglish
Pages (from-to)2951-2976
Number of pages26
JournalSeparation Science and Technology
Volume39
Issue number13
DOIs
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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