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Process for separating and recovering an anionic dye from an aqueous solution

United States Patent

5,707,525
January 13, 1998
View the Complete Patent at the US Patent & Trademark Office
Argonne National Laboratory - Visit the Technology Development and Commercialization Website
A solid/liquid phase process for the separation and recovery of an anionic dye from an aqueous solution is disclosed. The solid phase comprises separation particles having surface-bonded poly(ethylene glycol) groups, whereas the aqueous solution from which the anionic dye molecules are separated contains a poly(ethylene glycol) liquid/liquid biphase-forming amount of a dissolved lyotropic salt. After contact between the aqueous solution and separation particles, the anionic dye is bound to the particles. The bound anionic dye molecules are freed from the separation particles by contacting the anionic dye-bound particles with an aqueous solution that does not contain a poly(ethylene glycol) liquid/liquid biphase-forming amount of a dissolved lyotropic salt to form an aqueous anionic dye solution whose anionic dye concentration is preferably higher than that of the initial dye-containing solution.
Rogers; Robin (DeKalb, IL), Horwitz; E. Philip (Naperville, IL), Bond; Andrew H. (Tallahassee, FL)
Arch Development Corp. (Chicago, IL), Northern Illinois University (DeKalb, IL)
08/ 655,251
June 5, 1996
GOVERNMENTAL SUPPORT AND RIGHTS This invention was made with government support pursuant to Contract No. W-31-109-ENG-38 between the U.S. Department of Energy and The University of Chicago, contractor for Argonne National Laboratory, and National Science Foundation Grant CTS-9207264. The United States Government has certain rights in this invention.