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Title of article :
Dissolution of ionisable groups and lignocellulosic components during low-temperature kraft pulping of pinus radiata
Author/Authors :
Bhardwaj، نويسنده , , Nishi K. and Hoang، نويسنده , , Viet and Dang، نويسنده , , Vinh and Nguyen، نويسنده , , Kien L. Nguyen، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
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Abstract :
A wide range of kraft pulps from radiata pine produced by low-temperature kraft pulping in flow-through reactors was assessed for carboxyl and hexenuronic acid (HexA) contents using the conductometric titrations and UV spectrophotometer, respectively. The Kappa number of pulps varied from 20.8 to 84.7 when using a cooking liquor of 1 M effective alkali as Na2O, 25% sulfidity, and cooking time of 100–250 min. The experimental results showed that the carboxyl groups (including HexA) and HexA groups dissolved and their residual values in the pulp samples correlate linearly with Kappa number and pulp yield. The dissolving rate of all carboxyl groups is much faster than the loss of HexA. The HexA/lignin ratio decreased non-linearly with Kappa number.
Keywords :
Hexenuronic acid , Carboxylic acid , kraft pulp , Pinus radiata , Kappa number
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects
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