INVESTIGADORES
AREA Maria Cristina
artículos
Título:
CHARACTERIZATION OF Eucalyptus grandis KRAFT PULPS TREATED WITH PHOSPHONATES IN DIFFERENT STAGES OF TCF BLEACHING
Autor/es:
AREA, M.C.; FELISSIA, F.E.; CARVALHO, M.G.V.S.; FERREIRA, P.J.; BARBOZA, O.M.; BENGOECHEA, D.I.
Revista:
BIORESOURCES
Editorial:
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
Referencias:
Lugar: Raleigh; Año: 2011 vol. 6 p. 2077 - 2090
ISSN:
1930-2126
Resumen:
The aim of this work was to study the influence on pulp properties of the addition of a phosphonated chelant (DTPMPA) in different points of a TCF bleaching sequence. 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 handsheets tensile strength, brightness, skeletal density and total porosity (higher for Ca2+ based pulps). The hydrogen peroxide consumption in Op and P stages achieved the lowest values when the chelant is 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 are always more noticeable in Ca2+ based pulps.