PROCESS FOR PRODUCING BLEACHED PULP

摘要

It is intended to provide a process for producing bleached pulp in which unbleached pulp obtained by cooking a lignocellulose material is subjected to alkali/oxygen bleaching, treated with peroxomonosulfuric acid, and further a multi-stage chlorine-free bleaching treatment starting from a chlorine dioxide bleaching treatment is carried out; a process for producing bleached pulp in which the unbleached pulp is subjected to alkali/oxygen bleaching, and then subjected to a chlorine-free bleaching treatment or a totally chlorine-free bleaching treatment to bleach the pulp so as to have a whiteness of 70 to 89%, then the pulp is treated with peroxomonosulfuric acid; and paper produced at a papermaking pH of 6 or below using the bleached pulp obtained by such a production process. A process for efficiently producing bleached pulp in which the brown color is improved in the chlorine-free bleaching and the bleaching cost is reduced and paper produced in an acidic papermaking condition using the bleached pulp are provided.