Process for the delignification and/or bleaching of a paper...

Details Process for the delignification and/or bleaching of a paper... Process for the delignification and/or bleaching of a paper...

D - Textiles, Paper

21

B

D21B 1/02 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2202445

Process for the improvement in the selectivity of the delignification and/or bleaching of a preferably chemical paper pulp by means of a peroxyacid, according to which the pulp is treated with an aqueous solution of this organic peroxyacid in the presence of at least one ancillary agent for viscosity protection, selected from inorganic acids of phosphorus and their alkali metal salts, preferably pyrophosphoric acid, sodium pyrophosphates and their ammonium salts.

Processus d'amélioration de la sélectivité de la délignification et/ou du blanchiment de la pâte à papier, de préférence chimique, au moyen de peroxyacides. Selon ce processus, la pâte est traitée à l'aide d'une solution aqueuse de ces peroxyacides organiques en présence d'au moins un agent additif, pour protéger la viscosité, sélectionné à partir d'acides inorganiques phosphoreux et de leurs sels alcalins, de préférence des acides pyrophosphoriques, des pyrophosphates de sodium ainsi que leurs sels d'ammonium.

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