Air Separation by a Small-Scale Two-Bed Medical O2 Pressure Swing Adsorption
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- 作者：Jeong-Geun Jee ; Jong-Seok Lee ; and Chang-Ha Lee
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2001
- 出版时间：August 8, 2001
- 年：2001
- 卷：40
- 期：16
- 页码：3647 - 3658
- 全文大小：229K
- 年卷期：v.40,no.16(August 8, 2001)
- ISSN：1520-5045
文摘
A small-scale two-bed six-step pressure swing adsorption (PSA) process using zeolite 13X wasperformed to provide oxygen-enriched air in the medical system. The binary mixture N2/O2 (79/21 vol %) was used for PSA experiments. Cyclic behaviors of the PSA process were investigatedfrom unsteady- to steady-state conditions. Also, effects of various operating parameters on thePSA performance such as the P/F ratio, adsorption pressure, feed flow rate, and adsorptionstep time were investigated experimentally under the nonisothermal condition. The effect ofthe P/F ratio was noticeably changed according to the adsorption pressure and feed flow rateconditions. The higher the adsorption pressure, the slower the increasing rate of purity and thehigher the decreasing rate of recovery. However, as the adsorption pressure became higher, theeffect of the P/F ratio on the O2 purity became smaller. Furthermore, the effect of adsorptionpressure on the O2 purity and recovery was diminished gradually to the increase of the P/Fratio. The feed flow rate also had a strong effect on the O2 purity. As for the product purity, thelow feed flow rate began to lose its advantage with an increase in the P/F ratio. The recoveryand productivity at a high feed flow rate was higher than those at a low feed rate even underthe high product purity region. The dominant operating factor to determine the O2 purity waschanged from the adsorption pressure to the feed flow rate as the P/F ratio was changed fromlow to high values. The modified linear driving force (LDF) model similar to a solid-diffusionmodel predicted the transition behavior of the cyclic process better than the LDF model.