Method for bleaching paper pulp

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2265566

The invention concerns a method for the delignification and bleaching of chemical paper pulp consisting of an acid treatment step for reducing by at least 10 % the amount of hexeunoric acids present in the pulp, a step of adjusting the pH of the pulp for depositing or re-depositing alkaline-earth metal ions on the pulp fibres, adding a chelating agent to the pulp before and/or during the acid treatment step and/or before, during or after the pH adjusting step, a step of washing the pulp and a step of treating the pulp with an oxidising agent.

Procédé de délignification et de blanchiment de pâte à papier chimique comprenant une étape de traitement acide visant à réduire d'au moins 10 % la quantité d'acides hexèneuroniques présents dans la pâte, une étape d'ajustement du pH de la pâte visant à déposer ou à redéposer des ions de métaux alcalino-terreux sur les fibres de la pâte, l'addition d'un agent chélatant à la pâte avant et/ou pendant l'étape de traitement acide et/ou avant, pendant ou après l'étape d'ajustement du pH, une étape de lavage de la pâte et une étape de traitement de la pâte avec un oxydant.

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