ATTAPULGITE BASED LICL COMPOSITE ADSORBENTS FOR COOLING AND AIR CONDITIONING APPLICATIONS

摘要

A series of attapulgite-based LiCl composites were prepared with mixing method, incorporating hygroscopic LiCl into porous surface of attapulgite clay. Sorption properties of these composites were performed with high vacuum gravimetric method, desorption performance by TG-DTA analysis, and characterization by X-ray diffraction. The results show that both attapulgite structure and chloride content play prime roles in water adsorption on the AT-LiCl adsorbents, especially during lower water pressure, while at higher pressure, adsorption performances strongly depend on chloride content. At 1200Pa, water loading on AT-LiCl (30%) can be as high as 0.40kg/kg, while at 750Pa, the loading is 0.30kg/kg, which is higher than commonly used NaX and silica gel. The intension of water sorption on composite adsorbent is moderate. The composites can be effectively regenerated during 170-190°C. AT-LiCl (30%) seems to be an efficient candidate for cooling or air conditioning applications, specially concerning of utilization of waste heat lower than 170°C.