(628e) Limits of Rapid Pressure Swing Adsorption Processes: Does a Minimum Bed Size Factor Exist?
In this study, a two column PSA system was used to determine if a minimum BSF exists and what may be causing it. The process used a commercial LiLSX zeolite (~0.5 mm in diameter) and a traditional 4-step feed pressurization cycle in an experimental system capable of achieving cycles as low as 3 seconds. The results from the study demonstrate a definite minimum in BSF at a cycle time ~ 4 seconds for a product oxygen purity ~ 96% (argon free air feed). This represents the first known study to experimentally demonstrate a minimum BSF using a two column process. Experiments were conducted at various pressure ratios and column dimensions to determine their effect on the minimum BSF. It will further be postulated why the minimum is happening and how to predict process conditions where it will occur.