Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1994-04-12
1996-01-23
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
2504611, 162 49, G01N 2164, D21C 714
Patent
active
054869153
ABSTRACT:
Lignin concentrations from wood pulp samples are measured by applying an excitation light at a selected wavelength to the samples in order to cause the lignin to emit fluorescence. A spectral distribution of the fluorescence emission is then determined. The lignin concentration is then calculated based on the spectral distribution signal. The spectral distribution is quantified by either a wavelength centroid method or a band ratio method.
REFERENCES:
patent: 5166755 (1992-11-01), Gat
patent: 5216483 (1993-06-01), Berthold et al.
patent: 5220172 (1993-06-01), Berthold et al.
Tappi Test Methods, 1991, vol. 1, T236-CM 85, "Kappa Number of Pulp".
Klemhart, T. N. E Joyce, C. S. "Short Wavelength Ultraviolet Absorption of Various Lignin & Related Substances, Part I, " Pulp & Paper Mag of Canada, Apr. 1957, pp. 131-148.
Joyce, C. S. & Kleinhart, T. N, "Short Wavelength Ultraviolet Absorption of Various Lignins & Related Substances", Part II Pulp & Paper Mag of Canada, May 1957, pp. 131-148.
Kleinhart T. N. & Joyce S. "Short Wavelength Absorption of Various Lignins & Related Substances", III, Pulp & Paper Mag Canada, Jun. 1957, pp. 215-219.
Kleinhart, T. N. & Joyce C. S. "Short Wavelength Absorption of Various Lignins & Related Substances IV", Pulp & Paper Mag of Canada, Oct. 1957, pp. 147-152.
Hartler, N. Norrstrom H., "Light Absorbing Properties of Pulp & Pulp Components III" TAPPI Journal, vol. 52, No. 9, Sep. 1969.
Norrstrom, B. & Teder, A., "Absorption Bands in Electronic Spectra of Lignins"Svensk Papperstidning, 15 Jun. 1971, pp. 337-344.
Sjostrom, E., Haglund, P., "Spectrophotometric Determination of the Dissolution of Lignin During Sulfite Cooking" TAPPI, vol. 47, No. 5, May, 1964 pp. 286-291.
Bublitz, W, "Fluorescence of Pulping Liquors: A Tool for Diaster Control?", TAPPI vol. 64, Jun. 1981, pp. 73-76.
Baumgartner, D. J., Fledman, M. H., Gibbons, C. L. "A Procedure for Tracing Kraft Mill Effluent from an Ocean by Constituent Fluorescence" Water Research, Pergamon Press, vol. 4, 1971, pp. 533-544.
Bublitz, W. J. & Wade, D. C., "Applied Waste Liquor Fluorescence to Control Pulp Quality", Svensk Papperstidning, No. 18, 1979, pp. 535-538.
Wilander, A., Kvarnes, H. & Lindell, T. "A Modified Fluorometric Method for Measurement of Lignin Sulfonates & Its in-situ Application in Natural Waters", Water Research, vol. 8, 1974, pp. 1037-1045.
Demas, J. N. "Excited State Lifetime Measurements", Academic Press, NY, 1983 pp. 53-58.
Tikka, P. O. & Virkoka, N. E., "A New Kraft Pulping Analyzer for Monitoring Organic & Inorganic Substances," TAPPI Journal Jun. 1966, pp. 66-71.
Williams, D. J., "The Application of the Ultra Violet Absorption Characteristic of Lignin to the Control of Pulp Uniformity" Appita vol. 22, No. 2, Sep. 1968, pp. 45-52.
Capart R. Obese-Jeery, K, LeCardinal G., Gelus, M. "Contribution to On-Line Kraft Pulping Control", PRP 4 Proceedings Chent 1980, pp. 121-128.
BTG Sales "Kappa Number Analyzer", B 218.66 e-a Entire Paper-Product Brochure, Date Unknown.
Product Brochure-Asea Brown Boveri-Date Unknown.
Kubulneiks, E. Sandstrom, P. "Control of Oxygen Delignification Based on On-Line Kappa Number Measurement" 1988 International Pulp Bleaching Conference pp. 47-51.
BTG-Product Brochure "KNA-500 Kappa Number Analyzer" Entire Paper-Date Unknown.
Horvath, J. J. & Semerjian, H. G. "Laser Excited Fluorescence Studies of Black Liquor" Proceedings of the SPIE, vol. 665, Jun., 1986, pp. 258-264.
Jeffers Larry A.
Malito Michael L.
Edwards Robert J.
Hantis K. P.
Marich Eric
McGraw Vincent P.
The Babcock & Wilcox Company
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