Supercritical delignification of wood

Details Supercritical delignification of wood Supercritical delignification of wood

1988-09-16

1991-08-20

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 72, 162 77, 162 81, 162 82, 162 83, 162 90, 162 64, D21C 302

Patent

active

050411926

ABSTRACT:
An improved wood pulping process for the delignification of wood in a solvent wherein the solvent is a supercritical fluid under supercritical conditons and contains a delignification agent such as sodium hydroxide, sodium sulfide and/or sodium bisulfate.

REFERENCES:
patent: 3661698 (1972-05-01), Clayton et al.
patent: 3707436 (1972-12-01), O'Connor
patent: 4308200 (1981-12-01), Fremont
patent: 4397712 (1983-08-01), Gordy
patent: 4644060 (1987-02-01), Chou
patent: 4714591 (1987-12-01), Avedesian
Li et al., "Interaction of Supercritical Fluids with Lignocellulosic Materials", Ind. Eng. Chem. Res., vol. 27, No. 7, Jul. 1988, pp. 1301-1312.
CA 91:1422SH, vol. 91, No. 20, 1979.
Paper Chem No. 58-09926, "Supercritical Pulping A New Concept", Nov. 1987.

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