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Korean Chemical Engineering Research,
Vol.46, No.4, 783-791, 2008
Vol.46, No.4, 783-791, 2008
Li-X 제올라이트 흡착탑에서 H2/CO2, H2/CO, H2/CH4 혼합기체의 흡착 동특성
Adsorption Dynamics of H2/CO2, H2/CO and H2/CH4 Mixtures in Li-X Zeolite Bed
Li-X 제올라이트 흡착탑에서의 H2/CO2(80:20 vol%), H2/CO(90:10 vol%), H2/CH4(90:10 vol%)의 이성분계 기체의 흡착 동특성을 연구하였다. 각 계에서 공급유속(6.24~10.24 LPM), 흡착압력(6.1~10.1 bar)에 대한 영향을 살펴보았다. 동특성 실험 결과 파과시간은 공급유속이 적을수록, 흡착압력이 높을수록 증가하였으며 탑 내부 온도의 영향으로 tailing 현상이 발생하였다. Li-X 제올라이트 흡착탑에서 공급 유량과 압력의 확산계수에 의한 LDF식을 사용하여 예측하였다. 본 연구에서는 비등온과 비단열상태, Dual-site langmuir 등온식과 고려하여 해석하였으며 실험 데이터와 비교하였다.
The dynamic characteristics of adsorption using an adsorption bed packed with Li-X zeolite (UOP) were studied through the breakthrough experiments of H2/CH4 (90:10 vol%), H2/CO (90:10 vol%) and H2/CO2 (80:20 vol%) mixtures. Effects of feed flow rate (6.24~10.24 LPM) and adsorption pressure (6.1 bar~10.1 bar) in the Li-X zeolite bed with 2.7 cm of inside diameter and 80 cm of bed length were observed. The smaller feed rate or the higher operating pressure, resulted in the longer of the breakthrough time and the breakthrough curve have tailing due to temperature variance in the bed. The adsorption dynamics of the Li-X zeolite bed were predicted by using LDF model with feed flow and pressure dependent diffusivity. The prediction and experimental data were analyzed with a nonisothermal, nonadiabatic model, dual-site langmuir (DSL) isotherm
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