| 摘要 |
<p>The invention relates to a process for preparing a filtering material to be employed in the purification of ambient air. According to he invention, the process consists in that a non-woven textile support material having a thickness of 5...50 mm and a weight of 200...350 g/mis subjected to several successive stages of impregnation by immersion or pulverization with saturated solutions of sodium chloride 98% and, possibly, with mineral water or salts employed for balneary purposes, after each impregnation stage the material being subjected to a stage of controlled drying at a temperature of 20...35°C for 2...3 days, to result in a porous material impregnated with 20...90 g of salts spread within the porous structure mass.</p> |
