Langmuir moderate type 1 desiccant for air

B - Operations – Transporting – 01 – J

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B01J 20/18 (2006.01) B01D 53/04 (2006.01) B01D 53/28 (2006.01)

Patent

CA 2152361

A desiccant composition having a moderate Langmuir Type 1 moisture adsorption isotherm with a separation factor of from 0.05 to 0.13 is disclosed. The composition contains silica gel, a modified 13X molecular sieve (modified by replacing at least 20% of the sodium cations with other metallic cations, e.g., potassium cations), and desirably a hydrophobic adsorbent (desirably a hydrophobic molecular sieve). The composition may be used as the desiccant in a rotary regeneratable dehumidification wheel, thereby significantly enhancing dehumidification performance and simultaneously removing a significant proportion of the airborne pollutants typically contained in indoor and outdoor air.

La présente invention a pour objet une composition dessiccative ayant un isotherme d'absorption d'humidité de Langmuir modéré de type 1, avec un facteur de séparation compris entre 0,05 et 0,13. La composition en question contient du gel de silice, un tamis moléculaire modifié 13X (modifié en remplaçant au moins 20 % des ions sodium par d'autres ions métalliques, de potassium, par exemple) et, de préférence, un adsorbant hydrophobe (préférablement un tamis moléculaire hydrophobe). La composition en question peut être utilisée comme dessiccatif dans un tambour de régénération par déshumidification dans le but d'améliorer significativement le rendement en déshumidification tout en éliminant une importante proportion des polluants aéroportés contenus dans l'air intérieur et extérieur.

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