Control of recovery boiler operation by IR spectroscopy

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

162 301, 162 31, 162252, D21C 712, D21C 1112

Patent

active

053645022

ABSTRACT:
A direct monitoring and control method is provided for on-line measurement of effective alkali, carbonate, sulfate and thiosulfate concentrations in process liquors for the production of kraft pulp. The control method eliminates frequent sampling, and the need for frequent equipment maintenance. The method includes the steps of withdrawing samples of a liquor from the kraft manufacturing process, subjecting the samples to infrared spectrophotometry at predetermined wave numbers to produce peak-absorbance measurements relative to a background spectrum of water, determining peak absorbance for different alkali concentrations, correlating relationships between the peak-absorbance measurements of samples with the peak absorbance for different alkali concentrations to determine optimum effective alkali in the samples, and controlling at least one process parameter to obtain effective alkali of the liquor.

REFERENCES:
patent: 3553075 (1971-01-01), Rivers
patent: 3607083, Chowdhry
patent: 4540468 (1985-09-01), Genco et al.
patent: 4743339 (1988-05-01), Faix et al.
patent: 5082526 (1992-01-01), Dorris
Vroom, "The H Factor" 1957 Pulp and Paper Magazine of Canada, pp. 228-231, Convention Issue.
Ingruber et al., "The Effect of Hydrogen Ion . . . ", TAPPI, Dec. 1967 vol. 50, No. 12, pp. 597-614.
Hatton, "Development of Yield Protection . . . ", TAPPI, Jul. 1973 vol. 56, No. 7, pp. 97-100.
Wilson, "An Automatic Analyzer for Control of . . . " Svensk Papperstidning. ARG 75, No. 13, Jul. 15, 1972, pp. 522-523.
Maiorov et al., "Study of Continuous Absorption in Infrared . . . ", 1976 Zh. Fiz. Khim. 50 (11) pp. 2817-2820.
Sjostrom, "The Behavoir of Wood Polysaccharides . . . ", TAPPI, Sep. 1977 vol. 60, No. 9, pp. 151-154.
Ross et al., "Behavior of 4-O-Methylglucuronoxylan . . . ", TAPPI, vol. 48 No. 6, Jun. 1965, pp. 376-380.
Analysis of Sulphate Process Black Liquors, Standard J. 15P, Oct. 1991.
Grace, "Black Liquor Evaporation", Pulp & Paper Manufacture, 1983 Third Edition, TAPPI, pp. 477-479.
Kappa Number of Pulp, TAPPI Standard T636CM-85, 1984.
Analysis of Soda and Sulfate Black Liquor, TAPPI Standard T625cm-85, 1984.
Hatton, "The Significance of Residual Effective . . . ", TAPPI Proceedings 1984 Pulping Conference, pp. 469-478.
Rydholm, "Pulping Processes", Robert E. Krieger Pub. Co., 1985, p. 604.
Hough, "Chemical Recovery in the Alkaline Pulping Processes" TAPPI Press 1985, p. 107.
Williamson, "New Robot Analyzer Offers Optimum . . . ", Pulp & Paper Canada 87:2 (1986), p. 13.
Faix et al., "Continuous Process Control of Pulping . . . ", TAPPI Proceeding 1989 Wood & Pulping Chemistry, pp. 1-8.
Dorris et al., "Conductivity Sensors For Slaker Control . . . Part I" J. of Pulp & Paper Science, vol. 15, No. 4, Jul. 1989, pp. J122-131.
Michell, "Kappa Number Determination in Kraft Pulping . . . ", TAPPI Journal Apr. 1990, pp. 235-236.
Dorris, "Conductivity Sensors for Slaker control . . . Part II", Pulp & Paper Canada 92:2 (1990) pp. 45-51.
Watson et al., "On-Line Analysis of Caustic Streams by . . . ", Spectroscopy vol. 2, No. 1, 1990, pp. 44-48.
Melling et al., "Remote FTIR Spectroscopy . . . ", American Laboratory Dec. 1991, pp. 32c-32g.
Milanova et al., "On the Determination of Residual . . . ", TAPPI Press 1991 Pulping Conference, pp. 289-297.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Control of recovery boiler operation by IR spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control of recovery boiler operation by IR spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control of recovery boiler operation by IR spectroscopy will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1094734

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.