Positive and negative aspects of soda/anthraquinone pulping of hardwoods

The positive aspects of the non-sulfur soda/anthraquinone (SAQ) process are mostly tied to improved energy efficiency while lower pulp brightness after bleaching is its most significant drawback. A credible method that quantifies bleachability as well as an approach that solves the problem for SAQ p...

Full description

Saved in:

Bibliographic Details
Published in:	Bioresource technology Vol. 99; no. 17; pp. 8453 - 8457
Main Authors:	Francis, R.C., Bolton, T.S., Abdoulmoumine, N., Lavrykova, N., Bose, S.K.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-11-2008 [New York, NY]: Elsevier Ltd Elsevier
Subjects:	Anthraquinones - chemistry Applied sciences Biological and medical sciences Calcium Compounds - chemistry ClO 2 bleaching Ethanol - chemistry Exact sciences and technology Fundamental and applied biological sciences. Psychology Kraft pulping Lignin - metabolism Non-sulfur pulping Oxides - chemistry Oxygen - chemistry Oxygen delignification Paper and paperboard manufacturing Paper, paperboard, non wovens Polymer industry, paints, wood Prehydrolysis Pulp manufacturing Sodium Hydroxide - chemistry Transition Elements - analysis Water - chemistry Wood - chemistry Wood. Paper. Non wovens Kraft pulping Oxygen delignification Prehydrolysis ClO 2 bleaching Non-sulfur pulping Oxygen Chemical pulping Pulping Hardwood Delignification ClO2 bleaching Soda pulp Anthraquinone Kraft paper Bleaching Sulfur
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	The positive aspects of the non-sulfur soda/anthraquinone (SAQ) process are mostly tied to improved energy efficiency while lower pulp brightness after bleaching is its most significant drawback. A credible method that quantifies bleachability as well as an approach that solves the problem for SAQ pulps from hardwoods will be described. A straight line correlation ( R 2 = 0.904) was obtained between O 2 kappa number and final light absorption coefficient (LAC) value after standardized OD 0E pD 1 bleaching of nine hardwood kraft pulps from three laboratories and one pulp mill. The bleachability of pulps from four different soda processes catalyzed by anthraquinone (AQ) and 2-methylanthraquinone (MAQ) was compared to that of conventional kraft pulps by comparing O 2 kappa number decrease and final LAC values. It was observed that a mild hot water pre-hydrolysis improved the bleachability of SAQ pulps to a level equal to that of kraft.
Bibliography:	http://dx.doi.org/10.1016/j.biortech.2008.02.055 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0960-8524 1873-2976
DOI:	10.1016/j.biortech.2008.02.055