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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。

    Chlorine-free multiple step bleaching of cellulose
    2.
    发明授权
    Chlorine-free multiple step bleaching of cellulose 失效
    无氯多步漂白纤维素

    公开(公告)号：US3867246A

    公开(公告)日：1975-02-18

    申请号：US35178373

    申请日：1973-04-16

    Applicant: DEGUSSA

    Inventor： HEBBEL GERHARD ,  KRUGER HORST

    IPC: D21C20060101 ,  D21C9/10 ,  D21C9/16 ,  D21C1/04 ,  D21C3/04

    CPC classification number: D21C9/16

    Abstract: Cellulose is bleached in the absence of chlorine in an aqueous medium in a plural of steps including (1) employing an inorganic or organic peroxide or hydroperoxide under alkaline conditions, (2) an organic percarboxylic acid or water soluble salt thereof under acid conditions and (3) an inorganic or organic peroxide or hydroperoxide under alkaline conditions again. An acid pretreatment can be employed.

    Abstract translation: 纤维素在含水介质中不存在氯而以多个步骤漂白，包括（1）在碱性条件下使用无机或有机过氧化物或氢过氧化物，（2）在酸性条件下的有机过羧酸或其水溶性盐，和 3）在碱性条件下再次加入无机或有机过氧化物或氢过氧化物。 可以使用酸预处理。

    DECONTAMINATING EFFLUENTS
    6.
    发明专利
    DECONTAMINATING EFFLUENTS 未知

    公开(公告)号：AU3153977A

    公开(公告)日：1979-06-21

    申请号：AU3153977

    申请日：1977-12-14

    Applicant: DEGUSSA

    Inventor： JUNKERMANN HELMUT ,  KRUGER HORST

    IPC: C02F1/68 ,  C02F1/72 ,  C02C5/04

    Abstract: Waste water containing phenol, phenol derivatives or phenol plus formaldehyde is purified by treating the waste water with hydrogen peroxide and either iron, copper or the complex salt sodium iron (III) ethylenediamine tetraacetate.

    9.
    发明专利
    未知

    公开(公告)号：FR2436846A1

    公开(公告)日：1980-04-18

    申请号：FR7917876

    申请日：1979-07-10

    Applicant: DEGUSSA

    Inventor： KRUGER HORST ,  BERNDT WILHELM ,  SUSS HANS ULRICH

    IPC: D21C9/10

    Abstract: The process comprises at least three stages, the pulp being bleached in the first and third stages with a per compound and in the intervening second stage with chlorite. In particular for bleaching hard pulp, the latter can be subjected to a pretreatment with magnesium salts and/or organic complex formers. In the case of pulps which are difficult to bleach, or for regulating the degree of polymerisation, the process can be followed by further known bleaching stages. Between the first and second bleaching stages and any further bleaching stages following the process, washing with water is advantageously carried out. Washing between the second and third bleaching stages can be omitted. The process is suitable for bleaching all known pulp types, gives improved whiteness coupled with increased yield and allows substantial reduction in the present corrosion problems. Due to the reduced quantity of chlorite used, the process operates almost chlorine-free, and no significant quantities of chlorine pass into the effluent system.

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