Abstract
To produce pipeline-quality methane with a high level of adsorbent productivity from landfill gas, the pressure swing adsorption (PSA) process with carbon molecular sieve (CMS) was investigated experimentally and theoretically by using CO2/CH4 feed (50/50 vol %). Due to the high throughput as well as the high heat of adsorption of the faster diffusing component (CO2), the isothermal assumption was no longer valid and energy balance equations were inevitable for accurate prediction. Owing to the strong concentration dependency of sorption rate, the adsorption dynamics of the CMS bed in the PSA process were predicted by using a modified LDF model with concentration-dependent diffusivity. The nonisothermal and nonadiabatic model successfully predicted the performance of the CMS PSA process, which was operated by the Skarstrom cycle with cocurrent equalization. The purity was significantly affected by the changes in the adsorption pressure and adsorption step time, while the change in the recovery due to these operating variables was relatively small. The purge-to-feed ratio played a key role in improving the productivity based on the production of 90+% CH4 from the CH 4/CO2 mixture.
| Original language | English |
|---|---|
| Pages (from-to) | 5050-5058 |
| Number of pages | 9 |
| Journal | Industrial and Engineering Chemistry Research |
| Volume | 45 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 2006 Jul 5 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
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Kinetic separation of landfill gas by a two-bed pressure swing adsorption process packed with carbon molecular sieve : Nonisothermal operation. / Kim, Min Bae; Bae, Youn-Sang; Choi, Dae Ki; Lee, Chang-Ha.
In: Industrial and Engineering Chemistry Research, Vol. 45, No. 14, 05.07.2006, p. 5050-5058.Research output: Contribution to journal › Article
TY - JOUR
T1 - Kinetic separation of landfill gas by a two-bed pressure swing adsorption process packed with carbon molecular sieve
T2 - Nonisothermal operation
AU - Kim, Min Bae
AU - Bae, Youn-Sang
AU - Choi, Dae Ki
AU - Lee, Chang-Ha
PY - 2006/7/5
Y1 - 2006/7/5
N2 - To produce pipeline-quality methane with a high level of adsorbent productivity from landfill gas, the pressure swing adsorption (PSA) process with carbon molecular sieve (CMS) was investigated experimentally and theoretically by using CO2/CH4 feed (50/50 vol %). Due to the high throughput as well as the high heat of adsorption of the faster diffusing component (CO2), the isothermal assumption was no longer valid and energy balance equations were inevitable for accurate prediction. Owing to the strong concentration dependency of sorption rate, the adsorption dynamics of the CMS bed in the PSA process were predicted by using a modified LDF model with concentration-dependent diffusivity. The nonisothermal and nonadiabatic model successfully predicted the performance of the CMS PSA process, which was operated by the Skarstrom cycle with cocurrent equalization. The purity was significantly affected by the changes in the adsorption pressure and adsorption step time, while the change in the recovery due to these operating variables was relatively small. The purge-to-feed ratio played a key role in improving the productivity based on the production of 90+% CH4 from the CH 4/CO2 mixture.
AB - To produce pipeline-quality methane with a high level of adsorbent productivity from landfill gas, the pressure swing adsorption (PSA) process with carbon molecular sieve (CMS) was investigated experimentally and theoretically by using CO2/CH4 feed (50/50 vol %). Due to the high throughput as well as the high heat of adsorption of the faster diffusing component (CO2), the isothermal assumption was no longer valid and energy balance equations were inevitable for accurate prediction. Owing to the strong concentration dependency of sorption rate, the adsorption dynamics of the CMS bed in the PSA process were predicted by using a modified LDF model with concentration-dependent diffusivity. The nonisothermal and nonadiabatic model successfully predicted the performance of the CMS PSA process, which was operated by the Skarstrom cycle with cocurrent equalization. The purity was significantly affected by the changes in the adsorption pressure and adsorption step time, while the change in the recovery due to these operating variables was relatively small. The purge-to-feed ratio played a key role in improving the productivity based on the production of 90+% CH4 from the CH 4/CO2 mixture.
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U2 - 10.1021/ie0511074
DO - 10.1021/ie0511074
M3 - Article
VL - 45
SP - 5050
EP - 5058
JO - Industrial & Engineering Chemistry Product Research and Development
JF - Industrial & Engineering Chemistry Product Research and Development
SN - 0888-5885
IS - 14
ER -