Method and system for selective alkaline defiberization and deli

Details Method and system for selective alkaline defiberization and deli Method and system for selective alkaline defiberization and deli

1980-06-02

1982-05-11

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 82, D21C 320

Patent

active

043292003

ABSTRACT:
A method is provided for selectively defiberizing and delignifying lignocellulose employing a novel alkaline pulping system. The subject pulping system includes a pulping liquor comprising water, a water-miscible organic reagent, and a sulfide or bisulfide compound selected from the group consisting of alkali metal sulfides and bisulfides, ammonium sulfide and ammonium bisulfide. Extremely high pulp yields as compared to kraft pulping are provided by employing the method and system of this invention.

REFERENCES:
patent: 1817525 (1931-08-01), Richter
patent: 1891337 (1932-12-01), Seaman
patent: 2003347 (1935-06-01), Dreyfus
patent: 2166540 (1939-07-01), Bailey
patent: 3513068 (1970-05-01), Starr et al.

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