Carbohydrate and Lignin Retention in Kraft Pulping Using a Complete Factorial Design
Science Direct Working Paper No S1574-0331(04)70868-1
4 Pages Posted: 7 Jun 2017 Last revised: 20 Jan 2018
Date Written: August 2002
A complete factorial design was employed to investigate lignin, cellulose and hemicellulose retention in laboratory kraft pulping of wood using thin chips and short pulping time.Active alkali, sulphidity, pulping temperature and heating rate were the pulping variables investigated. Glucose, xylose, mannose, galactose, arabinose and rhamnose in wood and pulp were quantified by HPLC-PAD after acid hydrolysis. Uronic acids and lignin were quantified by specific methods.The active alkali on wood was the variable that most affected the chemical retention of hemicelluloses and lignin. Cellulose retention, expressed as glucan, was not affected by the investigated variables, indicating that short pulping and thin chips probably favour its retention. Xylan was the hemicellulose that remained after pulping.
Keywords: Macromolecular Chemistry > Cellulose Paper and Textiles, macrochem/0208003
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