Distribution of a-Cellulose, Hemicelluloses and Acid Insoluble Lignin During Total Chlorine Free Bleaching of AS/AQ Wheat Straw Pulp
Yaqoob, N and Stack, KR and Rehman, I and Cheema, KJ and Hameed, SR and Mateen, B (2011) Distribution of a-Cellulose, Hemicelluloses and Acid Insoluble Lignin During Total Chlorine Free Bleaching of AS/AQ Wheat Straw Pulp. Asian Journal of Chemistry, 23 (7). pp. 3050-3054.
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The effect of each individual bleaching stage on the percentage composition of a-cellulose, acid insoluble lignin and hemicelluloses in
multistage total chlorine free bleaching of alkaline sulphate/anthraquinone (AS/AQ) wheat straw pulp was studied by using standard
TAPPI and GC methods, respectively. With AOOxP bleaching, > 85 % of pulp fibers were calculated to be composed of true cellulosic fibers,
while acid insoluble lignin (%) contents decreased to as low as < 2.0 % as compared to an unbleached sample where pulp fiber constitutes
76.6 % a-cellulose and 7.6 % acid insoluble lignin. A statistical correlation was established and it was found that hemicelluloses are also
responsible for ageing of pulp. Burst and tensile index were also found to be effected by changes in hemicelluloses (%) in pulp structure.
|Keywords:||a-Cellulose, Hemicelluloses, Acid insoluble lignin, Gas chromatograph and brightness reversion.|
|Deposited By:||Dr Karen R Stack|
|Deposited On:||05 Jul 2011 14:53|
|Last Modified:||05 Jul 2011 14:54|
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