Process for obtaining cellulose from ligno-cellulosic raw materi

Details Process for obtaining cellulose from ligno-cellulosic raw materi Process for obtaining cellulose from ligno-cellulosic raw materi

1973-03-05

1976-01-13

Lindsay, Jr., Robert L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 75, 162 76, 162 77, 162 84, 162 90, D21C 320, D21C 326

Patent

active

039322076

ABSTRACT:
Prior to cooking, fragments of raw ligno-cellulosic material are impregnated with a solution of a lignin-solubilizing reactant in an organic solvent which has a boiling point higher than the cooking temperature in order for the material to absorb an amount of solution containing at least the amount of reactant required for solubilizing the lignin, then the impregnated material is immersed in a liquid which is substantially non-miscible with the solvent of said solution, said liquid having a boiling point higher than the cooking temperature, and said liquid is maintained at the cooking temperature until the lignin has been substantially converted to a derivative which is soluble in water or a water-miscible organic solvent.

REFERENCES:
patent: 1362723 (1920-12-01), Marr
patent: 1790838 (1931-02-01), Richter et al.
patent: 2022654 (1935-12-01), Dreyfus
patent: 2068151 (1937-01-01), Remler
patent: 2308564 (1943-01-01), McKee
patent: 2753309 (1956-07-01), Figdor
patent: 3338943 (1967-08-01), Speier
patent: 3448002 (1969-06-01), Bryce et al.

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