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Primary Examiner: Bashore, S. Leon
Assistant Examiner: Corbin, Arthur L.
Attorney:

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Title: Process for obtaining a predetermined Kappa number in sulfate pulping

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.

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Inventors: Wallin, Erik Gunnar (Domsjoverken, SW)

Application Number: 418634
Filing Date: 1973-11-23
Publication_date: 1976-03-02
Assignee: Mo och Domsjo Aktiebolag (Ornskoldsvik, SW)
Primary Class(es): 162/19 162/49, 162/62, 162/238
Other Classes:
US Patent Ref:

2950177	Aug, 1960	Brown et al.	324/65.
3652384	Mar, 1972	Sloman	162/49.
3679543	Jul, 1972	Rivers	162/49.
3886034	May, 1975	Noreus	162/62.
3888726	Jun, 1975	Hultman	162/49.

Other Refs: Other References: 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.