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System and method for rapidly determining a pulp kappa number using spectrophotometry

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A system and method for rapidly determining the pulp kappa number through direct measurement of the potassium permanganate concentration in a pulp-permanganate solution using spectrophotometry. Specifically, the present invention uses strong acidification to carry out the pulp-permanganate oxidation reaction in the pulp-permanganate solution to prevent the precipitation of manganese dioxide (MnO.sub.2). Consequently, spectral interference from the precipitated MnO.sub.2 is eliminated and the oxidation reaction becomes dominant. The spectral intensity of the oxidation reaction is then analyzed to determine the pulp kappa number.
Chai, Xin-Sheng (Atlanta, GA), Zhu, Jun Yong (Marietta, GA)
Institute of Paper Science and Technology, Inc.
10/ 233,983
September 3, 2002
[0002] This invention was made with Government support under Contract No. DE-FC07-96ID13438, awarded by the Department of Energy. The Government has certain rights in this Invention.