Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1982-07-29
1984-05-29
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 40, 162 57, 162 65, 162 89, D21C 912, D21C 914, D21C 1104
Patent
active
044513321
ABSTRACT:
A method is disclosed for delignification of ligno-cellulose containing fiber material comprising mixing an oxygen-containing gas with the cellulose fiber material so as to atomize the gas and form a foam of the gas and the cellulose fiber material, and without an intervening oxidation step, subjecting the foam to upwardly flowing, substantially non-pressurized, alkali extraction. The alkali extraction step is conducted at a temperature of from about 40.degree. to about 80.degree. C. and at a pH, ligno cellulose containing fiber concentration and oxygen containing gas concentration sufficient to provide a bleached, delignified cellulose fiber without bleaching the lignin substance extracted from the material and to suppress lignin condensation reaction during the extraction.
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"First Oxygen Pulping/Bleaching Seminar Draws High Attendance, Good Papers", Paper Trade Journal, Feb. 28, 1979, pp. 20-24.
"Atmospheric-Pressure Oxygen Bleaching", Eachus; TAPPI; vol. 58, No. 9, pp. 151-154.
Annergren Goran E.
Hagglund Tjell-Ake
Lindblad Per-Olov
Lindstrom Lars-Ake T.
Nasman Lars E.
Alvo Steve
Sca Development Aktiebolag
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