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Title
Organosolv pulping of cotton linter. II. Effect of dioxane and anthraquinone on cotton linter properties
Authors
NAHED A. ABD EL-GHANY
Received
June 2, 2011
Published
Volume 46 Issue 1-2 January-February
Keywords
anthraquinone (AQ), cotton linters, chemical reactivity (xanthation), prehydrolysis soda pulping,
Abstract
Compared to soda pulping, soda-dioxane pulping of cotton linter stabilizes the long-chain cellulose macromolecules against alkaline degradation. The presence of dioxane also results in a more open and accessible fine structure, higher chemical reactivity (upon xanthation), and better viscose filterability. Soda dioxane anthraquinone (AQ) pulping increases the stabilization of cellulose in cotton and gives pulp with higher accessibility, higher chemical reactivity and better viscose filterability, especially at a higher anthraquinone charge – of 0.1%. Acid prehydrolysis of cotton linter prior to soda dioxane AQ pulping favors the penetration of AQ and dioxane molecules among cellulose chains and breaks the hydrogen bonds, thus providing better accessibility of the hydroxyl groups to the reactant molecules, which leads to a pulp with higher chemical reactivity and better viscose filterability. It is evident that both the soda and the prehydrolyzed soda dioxane AQ pulping methods give cotton linter with better reactivity than that of commercial softwood viscose pulp.
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