Oxidative bleaching of wood pulp by vanadium-substituted...

Details Oxidative bleaching of wood pulp by vanadium-substituted... Oxidative bleaching of wood pulp by vanadium-substituted...

D - Textiles, Paper

21

C

D21C 3/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2143824

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: [VnMomWlNboTap(TM)q(MG)rOs]x- where n is 1-18, m is 0-40, l is 0-40, o is 0-10, p is 0-10, q ? 6, r ? 6, TM is a d-electron-containing transition metal ion, and MG is a main group ion, provided that n + m + o + l + p ? 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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