Pulping process – general approach Kraft pulping under alkaline conditions converts wood or other fibrous feedstocks into a product mass with liberated fibres.1-4 In the conventional kraft pulping, “white liquor”, containing mainly the active cooking chemicals, sodium hydroxide (NaOH) and sodium sulphide (Na2S) in water, is used for cooking the chips. After cooking or digestion,
Authors & references
Raimo Alén, University of Jyväskylä
Kleppe, P. J. 1970. Kraft pulping. Tappi 53(1):35−47.
Grace, T. M., Leopold, B., Malcolm, E. W. and Kocurek, M. J. (Eds.). 1989. Pulp and Paper Manufacture, Volume 5, Alkaline Pulping. 3rd edition. The Joint Textbook Committee of the Paper Industry, TAPPI&CPPA, USA and Canada. Pp. 23−44.
Sjöström, E. 1993. Wood Chemistry − Fundamentals and Applications. 2nd edition. Academic Press, San Diego, CA, USA. Pp. 140−161.
Alén, R. 2000. Basic chemistry of wood delignification. In: Stenius, P. (Ed.). Forest Products Chemistry. Fapet, Helsinki, Finland. Pp. 58−104.
Mimms, A., Kocurek, M. J., Pyatte, J. A. and Wright, E. E. (Eds.). 1989. Kraft Pulping – A Compilation of Notes. Tappi Press, Atlanta, GA, USA. Pp. 55−76.
Rydholm, S. 1965. Pulping Processes. Interscience Publishers, New York, NY, USA. P. 584.
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