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    ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS
    1.
    发明公开
    ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS 失效
    环境改良的渗透性物质的过程

    公开(公告)号：EP0483163A4

    公开(公告)日：1992-08-05

    申请号：EP90908787

    申请日：1990-05-17

    申请人： UNION CAMP CORPORATION

    发明人： GRIGGS, BRUCE, F. ,  GANDEK, THOMAS, P. ,  PIKULIN, MICHAEL, A. ,  ROSEN, ALLEN

    IPC分类号： D21C3/26 ,  D21C20060101 ,  D21C9/00 ,  D21C9/10 ,  D21C9/14 ,  D21C9/147 ,  D21C9/153 ,  D21C9/16

    CPC分类号： D21C9/1057 ,  D21C9/147 ,  D21C9/153

    摘要： A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater than about 13 cps; and further delignifying the partially delignified pulp with an effective amount of ozone for a sufficient time to obtain a substantially delignified pulp having a K No. of about 5 or less, a viscosity of greater than about 10, and a GE brightness of at least about 50 %. The substantially delignified pulp may be brightened by the addition of a bleaching agent such as chlorine dioxide or a peroxide to obtain a final product having a GE brightness of at least about 65 %, preferably above 70 % to as high as 90 %. Because of the absence of elemental chlorine in this sequence, filtrate from all stages but the chlorine dioxide stage (if used) can be recovered without sewering. Major environmental improvements are thus achieved.