The Effect of Anthraquinone and Anthrahydroquinone Penetration on Delignification in the Soda Pulping of Norway Spruce

Autor:	Peter Sarko, Laurel E. Falk, Carlton W. Dence, Michael I. Berger
Rok vydání:	1984
Předmět:	chemistry.chemical_compound chemistry General Chemical Engineering Inorganic chemistry Combined use Soda pulping General Materials Science General Chemistry Penetration (firestop) Alkali metal Kappa number Anthraquinone
Zdroj:	Journal of Wood Chemistry and Technology. 4:35-59
ISSN:	1532-2319 0277-3813
DOI:	10.1080/02773818408062282
Popis:	The extent of anthraquinone (AQ) penetration into handcut Norway spruce chips as a function of cooking time was examined through the combined use of 14C-label-led AQ and various wood sectioning techniques. The results indicated that in the initial stage of the cook, the AQ was deposited mainly at or near the chip surfaces in contrast to the alkali which penetrated to the chip core. With increasing cooking time, free and/ or combined AQ concentration at the transverse surface of the chips first decreased then increased both in this region and in the chip interior. This non-uniform distribution of AQ and alkali within the chips during the initial stage of pulping was also manifest by the Kappa number which increased significantly in proceeding from chip exterior to core. A substantial reduction in Kappa number without sacrifice in yield was achieved by impregnating the chips with an alkaline solution of anthrahydroquinone prior to pulping with alkali as compared with AQ addition in the conventional...
Databáze:	OpenAIRE
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