Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1990-01-02
1990-07-17
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
127 37, 162 72, 162 76, 162 77, D21C 320
Patent
active
049419447
ABSTRACT:
A method for the continuous countercurrent production of lignins and sugars from wood and other ligno cellulosic materials by organosolv delignification or saccharification at elevated temperatures and pressures is disclosed. The novel method comprises: (a) continuously introducing comminuted lignocellulose materials with a natural mositure content into a reaction vessel from one end; (b) continuously introducing a cooking liquor comprising a major proportion of organic solvent, a minor proportion of water, and a slight amount of inorganic acid countercurrently into the reaction vessel from the opposite end; (c) causing the comminuted lignocellulosic material to be contacted by the cooking liquor; and (d) continuously withdrawing cooking liquor from the reaction vessel after it has commingled with and has dissolved sugars and lignin and other substances from the comminuted lignocellulosic material.
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patent: 3585104 (1971-06-01), Kleinert
patent: 4409032 (1983-10-01), Chang et al.
patent: 4470851 (1984-09-01), Paszner et al.
patent: 4496426 (1985-01-01), Baumeister
patent: 4520105 (1985-03-01), Sinna et al.
Alvo Steve
McLeod Ian C.
Tonachel Pierre A.
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