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Method of filtering a target compound from a first solvent that is above its critical density

United States Patent

July 24, 2001
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
The present invention is a method of separating a first compound having a macromolecular structure from a mixture. The first solvent is a fluid that is a gas at standard temperature and pressure and is at a density greater than a critical density of the fluid. A macromolecular structure containing a first compound is dissolved therein as a mixture. The mixture is contacted onto a selective barrier and the first solvent passed through the selective barrier thereby retaining the first compound, followed by recovering the first compound. By using a fluid that is a gas at standard temperature and pressure at a density greater than its critical density, separation without depressurization is fast and efficient.
Phelps; Max R. (Richland, WA), Yonker; Clement R. (Kennewick, WA), Fulton; John L. (Richland, WA), Bowman; Lawrence E. (Richland, WA)
Battelle Memorial Institute (Richland, WA)
09/ 410,165
September 30, 1999
This invention was made with Government support under Contract DE-AC0676RLO1830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.