Method of alcohol washing brownstock pulp prior to a chlorinatio

Details Method of alcohol washing brownstock pulp prior to a chlorinatio Method of alcohol washing brownstock pulp prior to a chlorinatio

1989-04-17

1990-09-11

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

162 77, 162 87, 162 88, 162 89, D21C 902, D21C 912, D21C 914

Patent

active

049560484

ABSTRACT:
In the method of chemical pulping of wood including a chlorination stage pulp bleaching step followed by alkaline extraction, a method of reducing the amount of dioxins and furans produced thereby is disclosed wherein the brownstock pulp is first washed with alcohol prior to bleaching.

REFERENCES:
patent: 2042705 (1936-06-01), Dreyfus
Liebergott et al "Oxidative Bleaching-A Review"; Paper presented at 69th Annual Meeting Technical Section, Feb. 1 & 2, 1983.
Williamson, "Repap's ALCELL.TM. Process:", Pulp & Paper, Canada, Dec. 1987 pp. 47-49.

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