METHOD OF SEPARATING GAS MIXTURES Russian patent published in 1999 - IPC

FIELD: chemical engineering. SUBSTANCE: invention is designed for cases when gas mixtures are to be separated into fractions or to be fried from impurities, and also for application in gas-analysis technics. High-pressure gas mixture stream is created on one side of semipermeable membrane to be enriched with hard-permeating components and low-pressure countercurrent stream is created on the other side of semipermeable membrane to be enriched with easy-permeating components. A part of excess of enriched high-pressure gas mixture stream is taken off, throttled down, and fed into low- pressure stream. EFFECT: considerably decreased membrane surface required to achieve desired concentration of components. 2 cl, 2 dwg