Michelle Denise Steiner

US Patent:

55296602, Jun 25, 1996

Filed:

Apr 15, 1994

Appl. No.:

8/227882

Inventors:

Jack Kogan - Skokie IL
Michelle Steiner - Westmont IL

Assignee:

L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des
Procedes Georges Calude - Paris

International Classification:

D21C 502
D21C 9153
D21C 916

US Classification:

162 4

Abstract:

Provided herewith is a process for reducing the fluorescence of pulp fibers. The process comprises contacting the pulp fibers with ozone in two or more stages, with an intermediate washing stage or bleaching stage preferably being conducted in between the ozone contacting stages. It has been discovered that splitting the total ozone charge into two or more stages provides a much more efficient and effective process for reducing fluorescence.