Drying wood pulp in the presence of an alkali metal sulphite

Details Drying wood pulp in the presence of an alkali metal sulphite Drying wood pulp in the presence of an alkali metal sulphite

1982-03-02

1984-01-17

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Mechanical defibration in the presence of heated gas or gas...

162 56, 162 84, 162 85, D21C 304, D21C 914, D21C 918, D21B 116

Patent

active

044262582

ABSTRACT:
Bleached wood pulp is treated with a sulphite after bleaching and before or during flash drying to reduce the formation of nodules of agglomerated wood pulp fibres in the dried pulp, particularly in short fibre pulp from hard woods such as birch and eucalyptus. The sulphite is preferably added to the bleached pulp in the form of an aqueous solution of an alkali metal sulphite for example a 0.4 to 5 percent by weight solution of sodium sulphite. The process of the invention is particularly suitable for drying pulp which is at an acid pH due to residual acids remaining on the pulp from the bleaching process, for example pulp bleached by treatment with chlorine dioxide.

REFERENCES:
patent: 3069784 (1962-12-01), Aldred et al.
patent: 3388037 (1968-06-01), Asplund et al.
patent: 4065347 (1977-12-01), Aberg
patent: 4145246 (1979-03-01), Goheen et al.
patent: 4207140 (1980-06-01), Lindahl
patent: 4244778 (1981-01-01), Lindahl et al.
"Eastex Starts Up First Commercial Displacement Bleach Plant In World", Paper Trade Journal; Jun. 1, 1976.
"Thermomechanical Wood Pulp", Research Disclosure, No. 16751;3/1978.

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