SciELO - Scientific Electronic Library Online

 
vol.13 número2Variación radial y longitudinal de la densidad básica en árboles de Eucalyptus regnans de 16 años índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Maderas. Ciencia y tecnología

versão On-line ISSN 0718-221X

Resumo

PEREIRA, Miguel Angel; RUDOLF, Patt  e  KORDSACHIA, Othar. Effect of sodium sulfite charge in NSSC pulping of E. globulus. Maderas, Cienc. tecnol. [online]. 2011, vol.13, n.2, pp.225-234. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2011000200010.

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 of eucalyptus globulus pulping. A 12" Bauer refiner was employed in the mechanical stage. Pulp yields ranged within 70-90% and, results show that physical and mechanical properties increased significantly as yields decreased. Moreover, the defibration energy consumption and beatings energy also showed a significant decrease. Those pulps featuring yields near 80%, obtained with high sodium sulfite loads, presented similar physical and mechanical properties as chemical pulps. At the largest sulfide dose used here, no significant increase in chemical consumption was observed, especially at high yields. This study shows that physical and chemical properties are enhanced by high hemicelluloses content, and process selectivity to remove lignin from the middle lamella, which leads to a fiber integrity and reduced mechanical stress.

Palavras-chave : Semichemical pulp; Eucalyptus globulus; high yield pulp.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons