Low Odor, High Yield Kraft Pulping

McKean, W.T.

University of Washington (United States)

关键词: Thiosulfates;    Productivity;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Odor;    Sulfides;   

DOI  :  10.2172/809123
RP-ID  :  DOE/ID/13549
RP-ID  :  FC07-97ID13549
RP-ID  :  809123

美国|英语

来源: UNT Digital Library

【 摘 要 】

In laboratory cooks pure oxygen was profiled into the circulation line of a batch digester during two periods of the cooking cycle: The first injection occurred during the heating steps for the purpose of in-situ generation of polysulfide. This chip treatment was studied to explore stabilization against alkaline induced carbohydrate peeling and to increase pulp yield. Under optimum conditions small amounts of polysulfide were produced with yield increase of about 0.5% These increases fell below earlier reports suggesting that unknown differences in liquor composition may influence the relative amounts of polysulfide and thiosulfate generated during the oxidation. Consequently, further studies are required to understand the factors that influence the ratios of those two sulfur species.