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    Multiple step bleaching of cellulose with a per compound and chloride dioxide
    1.
    发明授权
    Multiple step bleaching of cellulose with a per compound and chloride dioxide 失效
    多种步骤使每种化合物和氯化二氧化物漂白纤维素

    公开(公告)号：US3865685A

    公开(公告)日：1975-02-11

    申请号：US35178473

    申请日：1973-04-16

    Applicant: DEGUSSA

    Inventor： HEBBEL GERHARD ,  KRUGER HORST ,  TRASER WERNER ,  PFAND HERBERT

    IPC: D21C20060101 ,  D21C9/10 ,  D21C9/14 ,  D21C9/16

    CPC classification number: D21C9/1057

    Abstract: Cellulose is bleached with reduced use of chlorine at atmospheric pressure in a plural step process using as the only bleaching agents chlorine dioxide and a per compound, which process begins and ends with per compound steps and has alternating per compound and chlorine dioxide steps.

    Abstract translation: 纤维素在大气压下使用氯气的使用量减少，在多步骤中使用，作为唯一的漂白剂二氧化氯和每种化合物，该方法以每个化合物步骤开始和结束，并且具有每个化合物和二氧化氯步骤的交替。

    PROCESS FOR THE PREPARATION OF CELLULOSE FIBRES FROM PINE
    3.
    发明专利
    PROCESS FOR THE PREPARATION OF CELLULOSE FIBRES FROM PINE 未知

    公开(公告)号：CA1133660A

    公开(公告)日：1982-10-19

    申请号：CA311653

    申请日：1978-09-20

    Applicant: DEGUSSA ,  SCHWAEBISCHE ZELLSTOFF AKTIENG

    Inventor： KRUEGER HORST ,  TRASER WERNER ,  FRANZREB JOHANN-PETER ,  KLEIN HEINRICH

    IPC: D21C9/10 ,  D21C9/08 ,  D21C9/16 ,  D21C3/06

    Abstract: The present invention provides a process for the preparation of cellulose fibres from pine, which are of the mediumviscosity to high-viscosity type, wherein the cellulose fibres obtained from pulping pine in sulphite cookers are treated, when required with a quantity of chlorine, which corresponds to between 0.01 and 20% by weight of the quantity of chlorine used in classical bleaching procedures applied to sulphite process cellulose fibres from pine, and/or wherein said cellulose fibres from pine, which have not been delignified further or only to a very limited extent in this treatment with chlorine, are pretreated, when required in an acidic medium, whereupon said cellulose fibres from pine are refined with alkali at an elevated temperature, and thereafter delignified in an alkaline, aqueous medium with peroxide compounds, and then bleached by applying conventional single-stage or multi-stage bleaching procedures.

    Multiple-stage process for the low-chlorine complete bleaching of wood pulp
    4.
    发明专利
    Multiple-stage process for the low-chlorine complete bleaching of wood pulp 未知

    公开(公告)号：CH618487A5

    公开(公告)日：1980-07-31

    申请号：CH1587875

    申请日：1975-12-05

    Applicant: DEGUSSA

    Inventor： KRUEGER HORST DR ,  TRASER WERNER ,  SCHROETER HELMUT ,  PFAND HERBERT ,  RATH HELMUT

    IPC: D21C9/10 ,  D21C3/22

    Abstract: The bleaching sequences of the multiple-stage process begin with an alkaline peroxide digestion. In particular, for the bleaching of hard wood pulps, a partial chlorination and extraction stage can follow the alkaline peroxide digestion or a partial chlorination can be carried out before the alkaline peroxide digestion. For the partial chlorination and extraction stages, only about 20% of the amount of chlorine previously used or 50% of the amount of alkali previously used is required. The bleaching liquors and bleaching waste water produced from the first stage, or, when partial chlorination is used before the peroxide digestion, from the first two stages, can be fed directly to a regeneration plant, by-passing the outfall. The process can be carried out at normal atmospheric pressure on the conventional devices, and in the peroxide bleaching stages, no water glass is required.

    BLEACH HYDROLYSIS OF PULP WITH SUBSTANTIALLY REDUCED USE OF CHLORINE
    5.
    发明专利
    BLEACH HYDROLYSIS OF PULP WITH SUBSTANTIALLY REDUCED USE OF CHLORINE 未知

    公开(公告)号：CA1080406A

    公开(公告)日：1980-07-01

    申请号：CA245088

    申请日：1976-02-05

    Applicant: DEGUSSA

    Inventor： KRUEGER HORST ,  TRASER WERNER

    IPC: D21C9/10 ,  D21C9/12

    Abstract: The present invention provides in a multistage process for fully bleaching a pulp using a minimum of chlorine, the improvement in which the first stage comprises an alkaline peroxide bleach hydrolysis in which stage the pulp is bleached with a content of alkali of 0.5 to 3% by weight, calculated as a 100% substance and relative to absolutely dry pulp, and at a temperature of the bleaching liquor of at least 65.degree.C.

    7.
    发明专利
    未知

    公开(公告)号：FI59433B

    公开(公告)日：1981-04-30

    申请号：FI49973

    申请日：1973-02-20

    Applicant: DEGUSSA

    Inventor： HEBBEL GERHARD ,  KRUEGER HORST ,  TRASER WERNER ,  PFAND HERBERT

    IPC: D21C20060101 ,  D21C9/10

    Abstract: Cellulose is bleached with reduced use of chlorine at atmospheric pressure in a plural step process using as the only bleaching agents chlorine dioxide and a per compound, which process begins and ends with per compound steps and has alternating per compound and chlorine dioxide steps.

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