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EPSRC Thermal Management of Industrial Processes

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EPSRC Thermal Management of Industrial Processes ( epsrc-thermal-management-industrial-processes )

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o Large capacity for water adsorption, especially at high vapour pressures; and o Heat of adsorption of water vapour is predominantly due the heat of condensation of water (Ponec et al, 1974; Oscik, 1982; Ruthven, 1984; Suzuki, 1990). Attributes of activated alumina: o Activated alumina is aluminium oxide in a porous form prepared by dehydration of aluminium hydrates (mostly Al2O3.3H2O) to about 6% moisture level; o Surface area ranging between 150 and 500 m2g-1 with pore sizes ranging from 1.5 to 6 nm; and o Generally useful as a drying agent and adsorbent for polar organic substances. Attributes of zeolites: o All zeolites are aluminosilicate minerals; o Pore volume cane range from 0.05 to 0.30 cm3g-1; and o Can be heated to about 500oC without damaging their adsorption and regeneration properties. Attributes of calcium chloride (CaCl2): o Calcium chloride is a very widely available; o Remains solid until saturated, beyond which it dissolves in water, yet can still be used as a low temperature liquid desiccant; and o Good as a solid chemical adsorbent for methanol and ethanol vapours. Attributes of activated carbon: o Activated carbons are made by pyrolysing and carbonising carbonaceous materials at high temperatures (700 to 800oC); o Available in powders, micro-porous, granulated, molecular sieves and carbon fibres; Powdered form (15 to 25 mm particles) is used for adsorption of liquids; o Granulated (sieved granules of 4 to 20 mesh or about 3 mm to 0.8 mm diameter) or pellet (extruded pellets of 4 to 6 mm length) forms for air purification and gas separation; o Microporous form has molecular sieving ability and is widely used for separation of nitrogen and oxygen in air; and o Activated carbon fibres (fibre diameter of 7 to 15 mm) made by carbonising synthetic fibres which can be used for air and water 43

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