METHOD AND APPARATUS TO PURIFY DRAINAGE GASSES FROM NITROGEN OXIDES Russian patent published in 1995 - IPC

FIELD: chemical, petrochemical industries. SUBSTANCE: drainage gasses are purified from dust and moisture and adsorbed NO_x by fine porous natural zeolite, that has, mass SiO₂ 67 90, Al₂O₃ 8 12, K₂O 0 4, Na₂O 0 5, CaO 0 5, impurities the rest up to 100 After saturation desorption is carried out by heating of natural zeolite up to temperature of 400 450 K with simultaneous its blowing out with gas-shaped nitrogen. Desorbed gas is passing through layer of heated up to 500 870 K charcoal with production of CO. Gasses, that have NO_x and CO, are passed through layer of heated alumosilicate, promoted by CuO and Cr₂O₃. NO_x is recovered to N₂. Purified gas is discharged in atmosphere. Apparatus to realize method has adsorbers Main new feature of the apparatus is that dust and moisture collector is mounted before adsorbers. EFFECT: method and apparatus are used in chemical, petrochemical, electronics and radioelectronics industries. 2 cl, 2 dwg, 2 tbl