Sequential bleaching of kraft pulp with chlorine dioxide followed by chlorine

摘要

There is provided a process for the sequential bleaching of kraft pulp comprising reacting kraft pulp with chlorine dioxide until the chlorine dioxide is . .at least partially.!. .Iadd.more than 50% .Iaddend. depleted, reacting the kraft pulp with chlorine .Iadd.without an intermediate wash. Iaddend., and treating the kraft pulp with caustic. PP. . Via this process bleached kraft pulps with exceptionally good brightness and strength characteristics are obtained.. !.