| abstract |
The present invention relates to a process for bleaching an unbleached or pre-bleached pulp comprising at least the following successive steps: a) preparing an unbleached or pre-bleached pulp having a pH greater than or equal to 8, b) contacting the pulp obtained at the end of step a) with chlorine dioxide, c) when the pH of the pulp obtained from step b) is less than 10 adding at least one Bronsted base to the pulp, d) adding hydrogen peroxide to the pulp obtained at the end of step c), e) maintaining the pulp obtained at the end of step d) in a first bleaching tower, f) optionally, adding sulfuric acid to the pulp obtained at the end of step e) and maintaining the pulp obtained in a second bleaching tower, the process being devoid of a step of washing the paper pulp before the end of step e), and, if appropriate, before the end of step f). |