| 摘要 |
An improved process for the pre-purification of air prior to introduction into a cryogenic air separation unit is described. Water vapor and carbon dioxide are substantially removed from air by a pressure swing adsorption (PSA) process utilizing an adsorbent which has an initial layer of activated alumina which comprises from about 70% to 100% by volume of the bed with the remaining layer, if present, being a suitable zeolite. The particles of adsorbent, particularly the zeolite, have a particle size not greater than two mm. The PSA cycle is particularly suited to the use of such finely particulate adsorbent.
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