Process for bleaching lignocellulosic matter

Details Process for bleaching lignocellulosic matter Process for bleaching lignocellulosic matter

1987-09-22

1989-03-14

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 25, 162 60, 162 78, 162 90, 162 86, 162 89, 162 84, D21C 326, D21C 300

Patent

active

048122068

ABSTRACT:
A process for bleaching a lignocellulosic matter in the form of a mechanical, thermomechanical, chemicomechanical or chemicothermomechanical papermaking pulp, or of wood chips while being converted into one of these pulp types by processing in a machine consisting essentially of two interpenetrating spiral surfaces wound around parallel shafts driven in synchronous rotation in the same direction inside a barrel which encloses them, and determining between upstream and downstream in the direction of forward travel of the matter a series of zones for drawing and braking the matter, which comprises combining a bleaching treatment using a reducing agent and a bleaching treatment using an oxidizing agent, characterized in that, after pretreatment using at least one metal-complexing or sequestering agent, the lignocellulosic matter undergoes a washing operation with an efficiency greater than 96% before undergoing in succession a bleaching treatment using a reducing agent at a pH of between about 8 and 12, a washing operation to remove the reducing agent and a bleaching treatment using an oxidizing agent.

REFERENCES:
Abstract Bulletin of the Institute of Paper Chemistry, vol. 53, NO. 2, Aug. 1982, p. 260, No. 2296, Appleton, Wisconsin, USA.

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