Gas separation – With remote fan or pump and unconfined flow to separator
Patent
1976-01-22
1977-07-26
Spear, Jr., Frank A.
Gas separation
With remote fan or pump and unconfined flow to separator
B01D 5316
Patent
active
040380599
ABSTRACT:
The transfer elements of the rotor of a regenerative heat and humidity exchanger are made of a non-hygroscopic material, such as aluminum, the surface of which is treated to form a hygroscopic layer thereon. This provides the benefits in humidity transfer previously obtained with all-hygroscopic transfer elements such as paper, cardboard or asbestos, without the danger of fire in the use of paper or cardboard or the danger to health in the use of asbestos. Preferably the transfer element is of metal on which a hygroscopic surface layer is formed by oxidizing the surface by pickling and/or heat treatment, and preferably the oxide layer is impregnated with a substance, e.g. lithium chloride, to render it more hygroscopic. Preferably also, the layer is made more porous by acid treatment prior to oxide formation, and acid treatment may be used after the pickling process to arrest the pickling reaction promptly.
REFERENCES:
patent: 2792071 (1957-05-01), Pennington
patent: 3176446 (1965-04-01), Siggelin
patent: 3572008 (1971-03-01), Hankison et al.
patent: 3708956 (1973-01-01), Norback
patent: 3733791 (1973-05-01), Dravnieks
Strindehag Ove
Wrangel Erik
Aktiebolaget Svenska Flaktfabriken
Spear, Jr. Frank A.
Spitzer Robert H.
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