Delignification of wood pulp by vanadium-substituted polyoxometa

Details Delignification of wood pulp by vanadium-substituted polyoxometa Delignification of wood pulp by vanadium-substituted polyoxometa

1992-08-28

1994-04-12

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

530506, D21C 300

Patent

active

053022483

ABSTRACT:
A method for delignifying wood pulp 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.n Mo.sub.m W.sub.l Nb.sub.o Ta.sub.p (TM).sub.q (MG).sub.r O.sub.s ].sup.x- where n is 1-18, m is 0-40, l is 0-40, o is 0-10, p is 0-10, q.ltoreq.6, r.ltoreq.6, TM is a d-electron-containing transition metal ion, and MG is a main group ion, provided that n+m+o+l+p.gtoreq.4 and s is sufficiently large that x>o. 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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