公开(公告)号：CA1122358A

公开(公告)日：1982-04-27

申请号：CA335412

申请日：1979-09-11

Applicant: DEGUSSA

Inventor： KRUGER HORST ,  BERNDT WILHELM ,  SUSS HANS U

IPC: D21C9/10 ,  D21C9/14

Abstract: The present invention provides a multistage process for the full bleaching of pulp having at least three-stages in which the pulp, when required after a pre-treatment with at least one of magnesium salts and organic complexing agents, is treated with a per compound in a first stage, with chlorite in a second stage and bleached with a per compound in a third stage.

公开(公告)号：PL168012B1

公开(公告)日：1995-12-30

申请号：PL29480192

申请日：1992-06-05

Applicant: DEGUSSA

Inventor： LEONHARDT WOLFGANG ,  SCHMIDT KURT ,  SUSS HANS U ,  GLAUM HOLGER

IPC: D21C9/10

Abstract: A process is disclosed for bleaching wood pulp, cellulose or used paper by treatment the fibre material to be bleached before the bleaching steps with a natural or synthetic zeolite or a layer lattice silicate and an easily decomposable organic complex forming agent, e.g. citric acid.