Studies On Preparation Of High-concentration Oxygen By An Integrated Process Of Pressure Swing Adsorption And Membrane Separation

Membrane Separation (MS) and Pressure Swing Adsorption (PSA), whichbelong to non-cryogenic air separation technology, have their own advantages anddisadvantages due to the principle differences. It's difficult to separate O₂ fromair up to 99.5% concentration by whichever methods mentioned above. Onstudying these two technologies, an integrated process of PSA and MS to producehigh-concentration(>99.5%) O₂, were brought forward in this thesis.Combination process of MS-PSA could not gain high-concentration productgases due to low separation ability on O₂ and Ar of PSA. When selectinghigh-permeant membrane, it has a certain economy to produce low-concentrationO2 by MS-PSAprocess.High-concentration O₂ could be obtained by PSA-MS process, such asPSA-MS-MS, but at very low recovery rate of 1.02%. It is not fit for practicalapplications.PSA-CMC (continuous membrane columns) integration process couldincrease recovery rate evidently and prepare O₂ at any concentration, with whichmembrane areas and reflux compression power are increased. Compared withother processes, PSA-CMC could produce high-concentration O₂ at lower costwhich is even lower than that of O₂ in bottles in medical market. Though thecost of PSA-CMC process is higher than large-scale cryogenic equipment, it hasthe advantages of small-scale, mobile and convenience to use.Though adopt only CMC process could separate high-concentration O₂ fromair, exorbitant membrane areas and reflux compression power are needed. It hasno practical values.