STUDY ON DEVELOPMENT OF ADSORVENT OF ACETALDEHYDE

The adsorption of acetaldehyde by porous ceramics impregnated with hyd razinium aluminum sulfate (HAS) is studied. Silicagel, activated alumi na, activated clay, and activated carbon are compared, and it is found that silicagel and activated clay are suitable as a substrate for HAS impregnated adsorbent. The adsorption mechanism of acetaldehyde by th e adsorvent is believed to be one in which acetaldehyde reacts with hy drazinium and yields acetaldazine. The adsorption capacity of the adso rvent at low acetaldehyde concentration of 0.1 ppm was as large as 1.3 6 mol/kg. This adsorption capacity at 0.1 ppm acetaldehyde concentrati on is remarkably larger than that of conventional activated carbon. Hy drazinium decomposes easily in the air because it is a strong reducing agent and reacts with oxygen or carbon dioxide. But hydrazinium impre gnated on porous ceramics with HAS becomes more stable and maintains r eactivity with acetaldehyde for longer than six months. An adsorbent m ade of porous ceramics impregnated with HAS is useful as a deodorant f or acetaldehyde.