Preview

PDF Restricted - Request a copy 332Kb

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.

Item Type:	Refereed Article
Keywords:	a-cellulose, hemicellulose,acid insoluble lignin, gas chromatography, brightness reversion
Research Division:	Chemical Sciences
Research Group:	Organic Chemistry
Research Field:	Natural Products Chemistry
Objective Division:	Manufacturing
Objective Group:	Wood, Wood Products and Paper
Objective Field:	Pulp and Paper
Author:	Stack, K (Dr Karen Stack)
ID Code:	76637
Year Published:	2011
Deposited By:	Chemistry
Deposited On:	2012-03-08
Last Modified:	2012-08-08
Downloads:	2 View Download Statistics