METHOD FOR ABSORPTION OF LOW-CONCENTRATED WATER-SOLUBLE GASES Russian patent published in 1994 - IPC

FIELD: gas purification in chemical engineering. SUBSTANCE: low- concentrated gases obtained at the preabsorption stage are washed with a recirculating absorptive liquor in which the gas to be absorbed is present in a dissolved or chemically bounded form. Venturi tube is employed with a unitary nozzle providing an irrigation density in the range of 100-500 m cubic/m square x h on a mouth area base. The absorptive liquor excess is supplied to the preabsorption stage. A final washing is conducted at an irrigation density in the range of 0,02-0,5 m cubic/m square x h on the washer area base. A waste water is fed to a recycle tank containing the absorptive liquor. The purification extent from dimethyl and nitrogen oxides is as 97.8, 96.1 and 96.9% respectively. EFFECT: enhanced efficiency of purification.