Positive and negative aspects of soda/anthraquinone pulping of hardwoods.
Bioresour Technol
; 99(17): 8453-7, 2008 Nov.
Article
em En
| MEDLINE
| ID: mdl-18420403
ABSTRACT
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 (R2=0.904) was obtained between O2 kappa number and final light absorption coefficient (LAC) value after standardized OD0EpD1 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 O2 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.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Óxidos
/
Papel
/
Hidróxido de Sódio
/
Madeira
/
Antraquinonas
/
Compostos de Cálcio
Idioma:
En
Revista:
Bioresour Technol
Assunto da revista:
ENGENHARIA BIOMEDICA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Estados Unidos