Pulping of lignocellulosic material by sequential treatment ther

Details Pulping of lignocellulosic material by sequential treatment ther Pulping of lignocellulosic material by sequential treatment ther

1975-04-07

1978-02-28

Corbin, Arthur L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Vacuum treatment

8156, 162 60, 162 63, 162 65, 162 81, 162 90, D21C 316, D21C 326

Patent

active

040765792

ABSTRACT:
Particulate lignocellulosic material, having a moisture content of about 10-80 weight percent, is treated at temperatures below about 50.degree. C. with 2 to 8 weight percent nitric oxide based on the weight of dry lignocellulosic material. Thereafter, said nitric oxide treated material is reacted with molecular oxygen to form nitric acid in situ. This reaction is followed by washing of said material with alkali and extraction of said material with alkali at a temperature above about 140.degree. C. to delignify the lignocellulose and form pulp.

REFERENCES:
patent: 2360779 (1944-10-01), Lang et al.
patent: 2733992 (1956-02-01), Reyerson

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