PROCESS FOR SEPARATION OF CO2 BY PRESSURE-MODULATED ADSORPTION ON A POROUS CARBON SOLID

摘要

A process for separation of carbon dioxide that is present in a gas mixture by pressure-modulated adsorption (PSA) that comprises at least the following stages is described:a) Bringing said mixture that is to be purified into contact with at least one adsorbent that is formed by a porous carbon material that comprises at least 70% by weight of carbon, whereby said material has a specific surface area that is larger than 1,500 m²/g, a micropore volume of between 0.5 and 2 cm³/g of adsorbent and between 0.5 and 0.8 cm³/cm³ of adsorbent,b) The adsorption of carbon dioxide on said adsorbent at a total pressure P1,c) The desorption of at least a portion of CO₂ that is adsorbed in said stage b) so as to produce a CO₂-enriched stream at a total pressure P2 that is less than P1.