Process for bleaching pulp or paper
AssigneeRoyce Associates
InventorRonald C. Naddeo
Life of this patent
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Abstract
A process for bleaching substantially lignin-free pulp or paper in a single-stage bleaching process or multi-stage bleaching process; comprising contacting said substantially lignin-free pulp or paper with an aqueous reductive bleaching solution comprising hydroxymethane sulfinic acid during a reductive bleaching stage for sufficient amount of time to at least partially bleach said substantially lignin-free pulp or paper.
Claims18
A process for bleaching substantially lignin-free pulp or paper in either a single-stage bleaching process or multi-stage reductive bleaching process;
- comprising
- contacting said substantially lignin-free pulp or paper with an aqueous reductive bleaching solution comprising hydroxymethane sulfinic acid during a reductive bleaching stage for sufficient amount of time at least partially to bleach said substantially lignin-free pulp or paper.
An aqueous reductive bleach solution comprising hydroxymethane sulfinic acid with at least one bleaching initiator.
Dependencies are inferred from the claim text.