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Using liquid desiccant as a regenerable filter for capturing and deactivating contaminants

United States Patent

December 11, 2007
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method, and systems for implementing such method, for purifying and conditioning air of weaponized contaminants. The method includes wetting a filter packing media with a salt-based liquid desiccant, such as water with a high concentration of lithium chloride. Air is passed through the wetted filter packing media and the contaminants in are captured with the liquid desiccant while the liquid desiccant dehumidifies the air. The captured contaminants are then deactivated in the liquid desiccant, which may include heating the liquid desiccant. The liquid desiccant is regenerated by applying heat to the liquid desiccant and then removing moisture. The method includes repeating the wetting with the regenerated liquid desiccant which provides a regenerable filtering process that captures and deactivates contaminants on an ongoing basis while also conditioning the air. The method may include filtration effectiveness enhancement by electrostatic or inertial means.
Slayzak; Steven J. (Denver, CO), Anderson; Ren S. (Broomfield, CO), Judkoff; Ronald D. (Golden, CO), Blake; Daniel M. (Golden, CO), Vinzant; Todd B. (Golden, CO), Ryan; Joseph P. (Golden, CO)
Midwest Research Institute (Kansas City, MO)
10/ 477,385
February 28, 2003
CONTRACTUAL ORIGIN OF THE INVENTION The United States Government has rights in this invention under Contract No. DE-AC36-99GO-10337 between the United States Department of Energy and the National Renewable Energy Laboratory, a Division of the Midwest Research Institute.