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    IMPROVED METHOD FOR BLEACHING LIGNOCELLULOSIC PULP
    3.
    发明公开
    IMPROVED METHOD FOR BLEACHING LIGNOCELLULOSIC PULP 失效
    改进方法漂白纸浆的木质纤维

    公开(公告)号：EP0720676A4

    公开(公告)日：1998-03-04

    申请号：EP94928001

    申请日：1994-09-02

    Applicant: UNION CAMP PATENT HOLDING

    Inventor： MICHAEL A PIKULIN ,  GANDEK THOMAS P ,  JOSEPH JAMES C

    IPC: D21C9/147 ,  D21C9/10 ,  D21C9/153 ,  D21C11/00

    CPC classification number: D21C11/0042 ,  D21C9/1005 ,  D21C9/153

    Abstract: The present invention is directed to a method for treating lignocellulosic pulp prior to a bleaching step to minimize consumption of bleaching agent during the bleaching step which comprises the steps of (a) contacting the lignocellulosic pulp with an aqueous solution having a pH of at least about 5 and less than about 11 for a time sufficient to dissolve lignin from the pulp to form a reduced-lignin pulp and a lignin-rich solution, (b) separating the reduced-lignin pulp from the lignin-rich solution, and (c) bleaching the reduced-lignin pulp with the bleaching agent; wherein the time sufficient to dissolve lignin from the pulp to form a reduced-lignin pulp and a lignin-rich solution in step (a) is an amount of time which results in a decrease in bleaching agent consumption in step (c) in the range from about 10 % to about 20 %.

    ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS.
    4.
    发明专利
    ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS. 未知

    公开(公告)号：MY111246A

    公开(公告)日：1999-10-30

    申请号：MYPI19911379

    申请日：1991-07-31

    Applicant: UNION CAMP PATENT HOLDING

    Inventor： MICHAEL A PIKULIN ,  THOMAS P GANDEK ,  ALLEN ROSEN ,  BRUCE F GRIGGS

    IPC: D21C9/153

    Abstract: 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. (FIG. 2)

    PULP BLEACHING REACTOR AND METHOD.
    8.
    发明专利
    PULP BLEACHING REACTOR AND METHOD. 未知

    公开(公告)号：MY108066A

    公开(公告)日：1996-08-15

    申请号：MYPI19911973

    申请日：1991-10-25

    Applicant: UNION CAMP PATENT HOLDING

    Inventor： WILLIAM H FRIEND ,  MICHAEL A PIKULIN ,  THOMAS P GANDEK ,  DAVID E WHITE

    IPC: D21C9/10 ,  D21C9/153

    Abstract: AN APPRATUS AND METHOD FOR DELIGNIFYING AND BLEACHING A LIGNOCELLULOSIC PULP WITHOUT THE USE OF ELEMENTAL CHLORINE. THE BLEACHING REACTOR IS A HORIZONTAL VESSEL HAVING A CENTRAL ROTATABLE SHAFT WHICH PREFERABLY CONTAINS PADDLES, CUT AND FOLDED SCREW FLIGHTS OR A RIBBON FLIGHT, TO DISPERSE AND ADVANCE THE PULP PARTICLES IN A PLUG FLOW MANNER WHILE CONTACTING AND MIXING THE PULP PARTICLES WITH A GASEOUS BLEACHING AGENT SUCH AS OZONE FOR SUBSTANTIALLY UNIFORM BLEACHING THEREOF.

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