David M Rausch

US Patent:

40510409, Sep 27, 1977

Filed:

Mar 17, 1976

Appl. No.:

5/667539

Inventors:

James J. Hazdra - Downers Grove IL
David J. Rausch - Naperville IL
Karl O. Munninger - North Las Vegas NV

International Classification:

B01D 1300

US Classification:

210321B

Abstract:

The present invention involves the partial carboxymethylation of cellulose to provide antithrombogenic characteristics when used as a hemo dialysis membrane. Partial carboxymethylation is obtained by reacting cellulose with an alkali chloroacetate.

US Patent:

58883983, Mar 30, 1999

Filed:

Jan 27, 1997

Appl. No.:

8/789653

Inventors:

Mark L. Dietz - Elmhurst IL
E. Philip Horwitz - Naperville IL
Richard A. Bartsch - Lubbock TX
Richard E. Barrans - Downers Grove IL
David Rausch - Naperville IL

Assignee:

ARCH Development Corp. - Chicago IL

International Classification:

B01D 1100
B01D 1102
C01D 1700
C07D32300

US Classification:

210634

Abstract:

A crown ether cesium ion extractant is disclosed as is its synthesis. The crown ether cesium ion extractant is useful for the selective purification of cesium ions from aqueous acidic media, and more particularly useful for the isolation of radioactive cesium-137 from nuclear waste streams. Processes for isolating cesium ions from aqueous acidic media using the crown ether cesium extractant are disclosed as are processes for recycling the crown ether cesium extractant and processes for recovering cesium from a crown ether cesium extractant solution.