Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1973-11-23
1976-03-02
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 49, 162 62, 162238, 324 65R, D21C 322, D21C 324, D21C 712
Patent
active
039416496
ABSTRACT:
A fully controllable process is provided for the manufacture of sulfate pulp having a predetermined degree of delignification and therefore a predetermined Kappa number. A sample of the pulping liquor is taken at a stage at which the preliminary alkali-consuming physical and chemical reactions and processes have substantially been completed, the sample is analysed to give the content of alkali in the liquor, and the alkali content adjusted to at least 20 g calculated as NaOH per kilogram of wood initially added, by addition of alkali. From this alkali content the pulping intensity expressed as "H" factor for obtaining the desired Kappa number is determined, and the pulping time and pulping temperature during delignification are controlled according to this H factor. It is also possible to adjust the alkali content in a controllable manner by injecting white liquor, black liquor or water into the digester. The process is applicable to continuous digesters as well as batch digesters.
REFERENCES:
patent: 2950177 (1960-08-01), Brown et al.
patent: 3652384 (1972-03-01), Sloman
patent: 3679543 (1972-07-01), Rivers
patent: 3886034 (1975-05-01), Noreus
patent: 3888726 (1975-06-01), Hultman
MacLeod, "Autocook System Brings Full Automation to Batch Digesters," Paper Trade Journal (Aug. 16, 1971) pp. 36-39.
Grant, "Computer Applications: Woodlands Through Bleach Plant-II," Paper Trade Journal (June 21, 1971) pp. 36-41.
Hatton, "Application of Empirical Equations to Kraft Progress Control," TAPPI V. 56, No. 8 (Aug. 1973), pp. 108-111.
Vroom, "The H` Factor: A Means of Expressing Cooking Times and Temperatures as a Single Variable," Pulp & Paper Mag. of Canada (Convention Issue 1957), pp. 228-231.
Bashore S. Leon
Corbin Arthur L.
Mo och Domsjo Aktiebolag
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