METHOD OF SEPARATING CRUDE GAS MIXTURE Russian patent published in 1997 - IPC

FIELD: chemical engineering. SUBSTANCE: easily adsorbable component (water, C₄-hydrocarbons, and sulfur-containing compounds) is first adsorbed under temperature gradient conditions, then moderately adsorbable component (carbon dioxide and C₃-hydrocarbons) is removed under pressure-gradient conditions. Hard-to adsorb component (nitrogen) is removed by cryogenic distillation in rectification column using liquefying still residue (methane and C₂-hydrocarbons). If easily adsorbable component is sulfur-containing compounds, moderately adsorbable component is water, carbon dioxide, and C₂-C₄-hydrocarbons, hard-to adsorb component is nitrogen, and still residue is methane. EFFECT: enhanced separation efficiency. 5 cl, 1 dwg