Process for simultaneous mechanical and chemical defibration of

Details Process for simultaneous mechanical and chemical defibration of Process for simultaneous mechanical and chemical defibration of

1996-03-12

1999-08-31

Silverman, Stanley S.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Particular raw cellulosic materials

162 97, 162 99, 162 26, D21H 1112

Patent

active

059449535

ABSTRACT:
A corn stalk and straw chip pulping method to greatly improve the yield of pulp by 1) preconditioning the corn stalk with propionic acid when harvesting or by impregnating the straw with HNO.sub.2 in the mill after chip washing, and 2) by pulping the stalk or straw chips in a high-consistency pulper with a KOH liquor, with or without K.sub.2 SO.sub.3, at a 12 to 15 percent consistency at 90.degree. C. for a predetermined time period (30 to 60 minutes). The pulping improvement step increases the yield of corn stalk and straw pulp from approximately 40 percent to 70 to 75 percent.

REFERENCES:
patent: 1845487 (1932-02-01), Darling
patent: 2625474 (1953-01-01), Atkinson et al.
patent: 2924547 (1960-02-01), Knapp et al.
patent: 3666620 (1972-05-01), Wright
patent: 4260452 (1981-04-01), Kruger et al.

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