Pulping of lignocellulosic material with oxygen in two stages at

Details Pulping of lignocellulosic material with oxygen in two stages at Pulping of lignocellulosic material with oxygen in two stages at

1973-12-12

1976-03-16

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

8111, 162 78, 162 90, D21C 326

Patent

active

039444635

ABSTRACT:
A process is provided for producing cellulose pulp of high brightness, which comprises pulping lignocellulosic material such as wood with oxygen under superatmospheric pressure in two stages, in the first at a pH within the range from about 6 to about 9, and in the second at a more alkaline pH of at least about 10.

REFERENCES:
patent: 2147618 (1939-02-01), Rawling
patent: 2673148 (1954-03-01), Harris
patent: 2926114 (1960-02-01), Grangaard et al.
patent: 3024158 (1962-03-01), Grangaard et al.
patent: 3251730 (1966-05-01), Watanabe
patent: 3764464 (1973-10-01), Samuelson
patent: 3769152 (1973-10-01), Samuelson et al.

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