Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1994-03-28
1996-09-03
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
530506, D21C 300
Patent
active
055520197
ABSTRACT:
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 [V.sub.l Mo.sub.m W.sub.n Nb.sub.o Ta.sub.p (TM).sub.q X.sub.r O.sub.s ].sup.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.gtoreq.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.
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Atalla Rajai H.
Hill Craig L.
Weinstock Ira A.
Czaja Donald E.
Emory University
Fado John D.
Nguyen Dean T.
Silverstein Howard M.
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