Process for delignifying raw cellulosic material impregnated wit

Details Process for delignifying raw cellulosic material impregnated wit Process for delignifying raw cellulosic material impregnated wit

1994-04-08

1996-12-24

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 78, 162 82, 162 86, 162 90, D21C 304, D21C 326

Patent

active

055870490

ABSTRACT:
A process for delignifying raw cellulose which comprises a preliminary treatment for impregnating raw cellulose with a monopersulphuric acid solution, a successive filtration without washing with recycle of the filtered liquid to the first step, and a treatment, at low temperature and in alkaline solution at a pH higher than 9, of the previously impregnated raw cellulose in order to permit the reaction of the monopersulphuric acid with the lignin contained in the raw cellulose.

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patent: 5091054 (1992-02-01), Meier et al.
patent: 5118389 (1992-06-01), Dubelsten et al.
Van Lierop, B., et al., "Caustic Extraction, Part I: Reaction Variables", Bleaching, A TAPPI Press Anthology of Published Papers 1987-1990, pp. 293-299 (Jameel, H., Ed. 1991).
Minor, J. L., et al., "Delignification of Woods Fibers with Peroxymonosulfate", Paperi ja Puu-Paper and Timber 72(10):967-973 (1990).
Rydholm, Pulping Processes, , Interscience Publishers, New York, Sep. 1967, pp. 294 and 354.

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