ADSORPTION METHOD FOR CLEANING HIGH-PRESSURE RAW GAS MIXTURE WITH RESPECT TO ITS LESS STRONGLY ADSORBED COMPONENT Russian patent published in 1997 - IPC

FIELD: gas cleaning, in particular, separation of raw gas mixture. SUBSTANCE: method is based on differential of pressures of gas adsorption cleaning and includes adsorption of easily adsorbed component of gas mixture and withdrawal of gas enriched with difficult-to-adsorb component. This gas is used in the other adsorption layer for building up pressure in this layer. In this case pressure in the first adsorption layer decreases. Pressure increase and decrease between layers is carried out in one or more stages up to pressure equalization between layers. Then, then first adsorption layer containing easily adsorbed component is blown with gas containing difficult-to-adsorb component, and gas containing difficult-to-adsorb component is applied there to increase pressure in the layer and to decrease it in the other adsorption layer after adsorption of easily adsorbed component from gas. Increase and decrease of pressure are carried out up to their balancing in one or more stages. Pressure is decreased to the value less than that of atmospheric pressure. Initial gas mixture consists of at least 75% of volume of difficult-to-adsorb components, such as methane and C₂-hydrocarbons. Easily adsorbed components are CO₂ and C₃-hydrocarbons. EFFECT: higher efficiency. 6 cl, 1 dwg, 1 tbl