Efecto de la carga de sulfito de sodio en el pulpaje NSSC de "E. globulus"

• Published in: Maderas: Ciencia y tecnología Vol. 13; no. 2; pp. 225 - 234
• Main Authors: Patt, Rudolf, Kordsachia, Othar, Pereira, Miguel Ángel
• Format: Journal Article
• Language: Spanish
• Published: Universidad del Bío-Bío 2011
• ISSN: 0717-3644

This paper presents experimental results on the effect of adding high doses of sodium sulphite (Na2SO3)to replace other sources of alkali, such as Na2CO3 or NaOH, in high-yield Neutral Semichemical Pulping(NSSC) process. Sodium sulfite (Na2SO3) was used as delignification agent in the chemical stage ofeucalyptus globulus pulping. A 12 Bauer refiner was employed in the mechanical stage. Pulp yieldsranged within 70-90% and, results show that physical and mechanical properties increased significantlyas yields decreased. Moreover, the defibration energy consumption and beatings energy also showed asignificant decrease.Those pulps featuring yields near 80%, obtained with high sodium sulfite loads, presented similarphysical and mechanical properties as chemical pulps. At the largest sulfide dose used here, no significantincrease in chemical consumption was observed, especially at high yields. This study shows that physicaland chemical properties are enhanced by high hemicelluloses content, and process selectivity to removelignin from the middle lamella, which leads to a fiber integrity and reduced mechanical stress.