Artículos de revistas
Characterization of eucalyptus grandis kraft pulps treated with phosphonates in different stages of TCF bleaching
Fecha
2011-05Registro en:
Area, Maria Cristina; Felissia, Fernando Esteban; Carvalho, M. Graça V. S.; Ferreira, Paulo J.; Barboza, Olga M.; et al.; Characterization of eucalyptus grandis kraft pulps treated with phosphonates in different stages of TCF bleaching; North Carolina State University. Department of Wood and Paper Science; Bioresources; 6; 2; 5-2011; 2077-2090
1930-2126
1930-2126
CONICET Digital
CONICET
Autor
Area, Maria Cristina
Felissia, Fernando Esteban
Carvalho, M. Graça V. S.
Ferreira, Paulo J.
Barboza, Olga M.
Bengoechea, Dora Inés
Resumen
The addition of a phosphonated chelant (DTPMPA) at different points of a TCF bleaching sequence and its effect on pulp properties were studied in this work. An industrial Eucalyptus grandis kraft pulp was submitted to a counter-ion exchange (Ca2+ or Na+ form) and was then bleached using DTPMPA in the washing or in the bleaching stages of two distinct sequences: OOpP and OQOpP (20 pulps). The counter-ion exchange affected fibre length, as well as the handsheets bulk and air permeability (higher for Na+-based pulps) and handsheet tensile strength, brightness, skeletal density, and total porosity based on Hg porosimetry (higher for Ca2+-based pulps). The hydrogen peroxide consumption in Op and P stages achieved the lowest values when the chelant was distributed rather than applied in a separate Q stage. The addition of chelant in the P stage provides pulps with higher ISO brightness (>85%). The chelant effects were always more noticeable in Ca2+-based pulps.