ABSORBING FILTER Russian patent published in 2008 - IPC B01D35/01 B01D39/04 B01D39/06 B01D53/00 B01D53/04 A62B23/00 A62B23/04 

FIELD: technological processes.

SUBSTANCE: absorbing filter is intended for air treatment plants removing harmful and toxic admixtures and aerosols from air and relates to group protection equipment. Absorbing filter includes cylindrical case with anti-aerosol and sorption treatment stages placed in sequence along air course, and inlet and outlet holes. First stage along air course is anti-aerosol one; it is made of cellulose and mineral fiber based materials, while the second, sorption stage is made of double-layer material where the first layer along air course consists of active carbon modified by copper and/or nickel salts and active carbon modified by copper, chrome and silver salts, at the weight ratio of 1:(0.75-1.5). The second layer is made of cellulose fiber material containing 30-50 wt % of active carbon and/or active carbon modified by copper and chrome salts.

EFFECT: improved air treatment quality, increased life time of absorbing filter and reliability of acid gas (such as chlorine or hydrogen sulfide) and ammonium absorption.

3 dwg, 1 ex