Parametric Study of Pressure Swing Adsorption Process To Purify Oxygen Using Carbon Molecular Sieve
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- 作者：Min-Bae Kim ; Jeong-Geun Jee ; Youn-Sang Bae ; and Chang-Ha Lee
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2005
- 出版时间：August 31, 2005
- 年：2005
- 卷：44
- 期：18
- 页码：7208 - 7217
- 全文大小：315K
- 年卷期：v.44,no.18(August 31, 2005)
- ISSN：1520-5045
文摘
To produce O2 with a high purity of 99+% and a high productivity from various oxygen-richfeeds, a parametric study was done on a six-step pressure swing adsorption (PSA) purifier usingcarbon molecular sieve (CMS). The cyclic performances of the PSA process such as purity,recovery, and productivity were compared under nonisothermal conditions. To study the effectsof N2 amount on the PSA purifier, various feeds with 90% O2 or more were experimentally andtheoretically applied for the PSA process. Since N2 plays a key role in product purity, themaximum purity of the PSA was 99% O2 with 51.5% recovery from a higher nitrogen feed(O2:Ar:N2; 90:4:6 vol %) and 99.8% O2 with 56.9% recovery from a lower nitrogen feed(O2:Ar:N2; 95:4:1 vol %) within the experimental range. The adsorption step time and feed flowrate served as key operating variables in the purification of the oxygen-rich feeds because theconcentration wave fronts of minor impurities such as N2 and Ar were controlled by kineticselectivity. To produce 99% O2 purity from feeds with various amounts of N2, the optimumoperating variables were set to maximize the recovery and productivity within the experimentalranges. A high feed flow rate accompanied by a short adsorption step time could increase bothpurity and productivity. Without any serious loss of recovery and productivity, the process couldpurify the feed with higher than 91% O2 to the product with higher than 99% O2. Thenonisothermal model incorporating mass, energy, and momentum balance together with aconcentration-dependent rate model could accurately predict the performance results.