Process for the conversion of lignocellulosic material to cellul

Details Process for the conversion of lignocellulosic material to cellul Process for the conversion of lignocellulosic material to cellul

1981-08-24

1985-12-31

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 72, 162 76, 162 90, D21C 302, D21C 304, D21C 320

Patent

active

045619360

ABSTRACT:
A two-stage process is provided for the conversion of lignocellulosic material, for instance, wood, to cellulose pulp, first oxidizing the lignocellulosic material to form aldonic acid end groups, preferably bound with 1,4-glycosidic bonds, in the polysaccharides, in an alkaline medium in the presence of the oxidized form of a redox additive which is converted into a reduced form in reaction with the wood and/or products formed from the wood, withdrawing the alkaline medium and then reoxidizing the reduced form of the redox additive in the absence of the lignocellulosic material at a rate to maintain the oxidized form of the redox additive in a major proportion in the alkaline medium during oxidation of the lignocellulosic material by contacting the withdrawn alkaline medium with oxygen-containing gas, and then continuing the digestion in an alkaline medium at a temperature within the range from about 160.degree. to about 200.degree. C., also in the presence of a redox additive, but without any addition of oxygen.

REFERENCES:
patent: 3759783 (1973-09-01), Samuelson et al.
patent: 4012280 (1977-03-01), Hulton
patent: 4089737 (1978-05-01), Nagano et al.
patent: 4091749 (1978-05-01), Procter et al.
patent: 4127439 (1978-11-01), Fujii et al.
patent: 4134787 (1979-01-01), Eckert
McCloskey et al., "Catalytic Influence of Iron and Magnesium Ions in Oxygen Blocking Reactions" TAPPI, vol. 58, No. 2, Feb. 1975.

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