Preparation of bleached chemithermomechanical pulp

Details Preparation of bleached chemithermomechanical pulp Preparation of bleached chemithermomechanical pulp

1992-07-29

1994-03-29

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Simultaneous mechanical defibration and chemical treatment

162 72, 162 78, 162 80, 162 83, 162 84, D21C 106, D21C 916

Patent

active

052981185

ABSTRACT:
Bleached chemithermomechanical wood pulp having a high degree of whiteness is economically prepared by mechanically disintegrating and chemically digesting lignocellulosic material with sulfite at a temperature of at least 100.degree.C. under saturated water vapor pressure and thereafter bleaching the pulp thus treated with hydrogen peroxide in an alkaline medium, and wherein no solids or liquids are removed from the pulp from the outset of treatment through completion of the bleaching step.

REFERENCES:
patent: 3388037 (1968-06-01), Asplund et al.
patent: 4116758 (1978-09-01), Ford et al.
patent: 4259148 (1981-03-01), Beath et al.
patent: 4767499 (1988-08-01), Simonson et al.
patent: 4804440 (1989-02-01), Libergott et al.
Kruper et al., "Oxygen/Peroxide Bleaching of Sulphite Pulp-A Possibility For Brightness Improvement".

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