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Puumassan hapettava valkaisu vanadiniumsubstituoiduilla polyoksometalaateilla
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Title:
Puumassan hapettava valkaisu vanadiniumsubstituoiduilla polyoksometalaateilla
Author:
HILL,CRAIG L
;
WEINSTOCK,IRA R
Subjects:
APPARATUS THEREFOR
;
CHEMISTRY
;
COMPOSITIONS BASED THEREON
;
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
;
METALLURGY
;
ORGANIC MACROMOLECULAR COMPOUNDS
;
PAPER-MAKING
;
PRODUCTION OF CELLULOSE
;
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
;
REGENERATION OF PULPING LIQUORS
;
TEXTILES
;
THEIR PREPARATION OR CHEMICAL WORKING-UP
Description:
A method for delignifying wood pulp and fiber is disclosed. The method comprises the steps of obtaining a wood pulp and exposing the wood pulp to a polyoxometalate of the formula [VlMomWnNboTap(TM)qXrOs]x- where l is 0-18, m is . 0-40, n is 0-40, o is 0-10, p is 0-10, q is 0-9, r is 0-6, TM is a d-electron-containing transition metal ion, and X is a heteroatom, which is a p or d block element, where l+m+n+o+p>/=4, l+m+q>0 and s is sufficiently large that x>0. The exposure is under conditions wherein the polyoxometalate is reduced. In a preferable form of the invention, the method additionally comprises the step of reoxidizing the polyoxometalate.
Creation Date:
2002
Language:
Finnish;Swedish
Source:
esp@cenet
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