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![]() These works are licensed under a Creative Commons Attribution 4.0 International License. L.A. Milovidova, T.A. Koroleva, M.E. Romanov, E.O. Okulova Complete text of the article:Download article (pdf, 0.2MB )UDС676.017DOI:10.17238/issn0536-1036.2015.5.174AbstractBirch and aspen are the main species of deciduous wood raw materials for the pulp and paper mills of Russia. These wood species have differences in density and in the fiber mor-phology. These facts have a significant impact on the technology of pulp production and its properties. The previous studies have shown an economic effect in the increasing of the birchwood content in the composition of hardwood raw material only up to 70 %. Further increase leads to an unjustified increase of production costs of bleached pulp because of the increased bleaching requirement. However, the consumption of bleaching reagents depends not only on the species of wood, but also on the reactivity of the pulp components, primarily of lignin as the lignin reactivity is largely dependent on the pulping conditions. This paper presents the research results of the effect of the hardwood cooking conditions on the pulp bleachability. The content of birchwood in the raw material was 70 %. The pulp ability to be bleached (bleachability) is usually assessed by the chlorine dioxide consumption per 1 kappa unit. Under laboratory conditions the wood cooking was conducted. The kappa number of the obtained pulp samples was of 17...18 units. It has been established that a positive influence on the pulp bleachability, obtained from the raw material of that kind, has increased the concentration of active alkali up to 60 g/l, which corresponds to an active alkali consumption of 18 % per a Na2O unit, and the reduction of duration at the final temperature up to 40 min at 156 ?C cooking temperature. The two-stage oxygen-alkaline treatment can further improve the bleachability of sulfate hardwood pulp.AuthorsL.A. Milovidova1, Candidate of Engineering, Senior Research ScientistT.A. Koroleva1, Candidate of Engineering, Associate Professor
M.E. Romanov2, Technical Engineer
E.O. Okulova1, Postgraduate Student
Affiliation1Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia; е-mail: lmilovidova@mail.ru2BKT Service LLC, Mozhayskaya st., 18, bl.A, office 6H, Saint Petersburg, 190013, Russia; е-mail: maxim.romanov@bktservice.ruKeywordshardwood pulp, birchwood and aspenwood, pulping conditions, pulp bleachabil-ity, oxygen-alkaline pulp treatment.References1. Bobrov A.I., Mutovina M.G., Bondareva T.A., Malyshkina V.K. Proizvodstvo vo-loknistykh polufabrikatov iz listvennoy drevesiny [Production of Fibrous Semi-Finished Hardwood]. Moscow, 1984. 248 p. 2. Ershov A.V., Malysheva L.V., Gavrilova V.E. K voprosu o formirovanii pechatnykh vidov bumagi s povyshennym soderzhaniem listvennoy sul'fatnoy tsellyulozy. Sbornik trudov [On the Formation of Printed Paper Types with a High Content of Hardwood Kraft Pulp: Collected Papers]. Moscow, 1978, no. 15, pp. 17–24. 3. Karmanova T.E., Komarov V.I., Milovidova L.A. Vzaimosvyaz' vyazkosti s prochnostnymi i deformatsionnymi svoystvami listvennoy i khvoynoy tsellyulozy [Viscosity Relationship With the Strength and Deformation Properties of Hardwood and Softwood Pulp]. Cellulose. Paper. Board, 2010, no. 6, pp. 46–49. 4. Lesa, lesnye resursy i lesoupravlenie v Rossiyskoy federatsii [Forests, Forest Re-sources and Forest Management in the Russian Federation]. Available at: http:// www.profor.info/sites/profor.info/files/Background-ForestGovernance-Russia-Russian.pdf. 5. Milovidova L.A., Komarova G.V., Sevast'yanova Yu.V. Vliyanie usloviy varki na belimost' listvennoy sul'fatnoy tsellyulozy [Effect of Cooking Conditions on the Hardwood Kraft Pulp Bleachability]. Cellulose. Paper. Board, 2004, no. 9, рp. 64–65. 6. Nikandrov A.B., Lachenal P., Mortha G., Robert P., Zarubin М.Ya. Uksusno-kislotnyy metod vydeleniya lignina iz drevesiny i tsellyulozy [The Method of Acetic-Acid Extraction of Lignin From Wood Pulp]. Cellulose. Paper. Board, 2001, no. 7–8, pp. 26–30. 7. Novye tekhnologicheskie razrabotki po ispol'zovaniyu listvennoy drevesiny na Kotlasskom TsBK [The New Technological Developments on the Use of Hardwood in the Kotlas Pulp ana Paper Mill]. Moscow, 1981, p. 24. 8. Romanov M.E., Oparina A.A., Milovidova L.A. Vozmozhnosti uvelicheniya vyrabotki listvennoy tsellyulozy na sushchestvuyushchem varochnom oborudovanii [Possi-bility of Increasing the Production of Hardwood Pulp in the Existing Cooking Equip-ment]. Pulp. Paper. Board, 2012, no. 4, рp. 42–44. 9. Tekhnologiya tsellyulozno-bumazhnogo proizvodstva. Spravochnye materialy [Technology of Pulp and Paper Production. Reference Materials]. Saint Petersburg, 2002, vol. I, рart 1. 419 p. 10. Ala-Kaila K., Li J., Sevastyanova O., Gellerstedt G. Apparent and Actual Delig-nification Response in Industrial Oxygen-Alkali Delignification of Birch Kraft Pulp. Tappi J., 2003, vol. 2, no. 10, pp. 23–27. 11. Argyropoulos D.S. Salient Reactions in Lignin During Pulping and Oxygen Bleaching. Pulp and Paper Science, 2003, vol. 29, no. 9, pp. 308–313. 12. Johansson G., Samuelsson O. Alkaline Destruction of Birch Xylan in the Light of Recent Investigations of Its Structure. Svensk Papperstidn, 1977, vol. 80, no. 16, pp. 519–524.Received on January 30, 2015
Features of the Bleached Sulfate Hardwood Pulp Production When Using the Birch and Aspen Wood Resources in the Ratio of Seventy-to-Thirty |
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