| 摘要 |
1439614 Separating gas mixtures C J B DEVELOPMENTS Ltd 31 July 1973 [23 Aug 1972] 39249/72 Heading B1L A first constituent is removed from a gas containing at least a first, second and a third constituent wherein said second constituent interferes with the removal of said first constituent (e.g. removing carbon dioxide from moist air where water is the second constituent), by (i) subjecting the gas to a first treatment with a first bed of a reversible adsorbent (e.g. silica gel or a 3 A zeolite to remove said second constituent therefrom; (ii) removing said first constituent from the gas treated in step (i); (iii) subjecting the product gas from step (ii) to a second treatment with a second bed of a reversible adsorbent for said second constituent (e.g. a 5 A zeolite) which adsorbent has previously absorbed said second constituent, the second constituent being desorbed from said second bed of reversible absorbent and being reintroduced into the gas to produce a product gas containing said second and third constituents in the absence of said first constituent; (iv) operating steps (i), (ii) and (iii) in a cyclical manner by reversing the direction of flow of the gas before said absorbent becomes saturated and before the desorbing material becomes denuded of the second constituent; energy being supplied to the system to accommodate incidental losses during operation solely by operating the first treatment in step (i) at a pressure which is higher than that of the second treatment in step (iii). |
