SEPARATION OF MULTICOMPONENT GAS MIXTURES BY SHORT-CYCLE UNHEATED ADSORPTION WITH THREE-STAGE EXTRACTION OF TARGET GAS OF HIGH PURITY Russian patent published in 2017 - IPC B01D53/47 C01B3/50 C01B13/02 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and can be used in production of nitrogen, oxygen and argon from atmospheric air. Method involves using multiple adsorption columns. Main columns (1, 2) are filled with adsorbent which absorbs non-target components of gas mixture, and auxiliary adsorption columns (3) are filled with adsorbent which absorbs target component of gas mixture. Raw gas mixture under excess pressure is fed into main adsorption columns (1, 2), after which end product-rich gas is moved into auxiliary adsorption columns (3), where adsorbent absorbs target gas. After that, target gas is separated from adsorbent and moved back into main adsorption columns (1, 2), where pressure of target gas is raised while bringing it to high purity. Adsorbents are selected so that saturation time of adsorbent in main adsorption columns is approximately twice longer than saturation time of adsorbent in one or more auxiliary adsorption columns.

EFFECT: invention enables to reduce complexity of process diagram, overall dimensions and material consumption of plant.

6 cl, 1 tbl, 1 dwg