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25 条记录 (耗时 0.016 秒)

    AMBIENT TEMPERATURE PULP BLEACHING WITH PEROXYACID SALTS
    2.
    发明公开
    AMBIENT TEMPERATURE PULP BLEACHING WITH PEROXYACID SALTS 失效
    过氧酸盐常温漂白纸浆

    公开(公告)号：EP0823003A1

    公开(公告)日：1998-02-11

    申请号：EP96910520.0

    申请日：1996-03-21

    申请人： UNION CAMP PATENT HOLDING, INC.

    发明人： ALI, Omar, F.

    IPC分类号： D21C9

    CPC分类号： D21C9/1057 ,  D21C9/166

    摘要： The present invention relates to a Kraft pulp bleaching stage which is to be carried out after conventional bleaching stages to high brightness. It has been discovered that ambient-temperature blaching with inorganic peroxyacid salts, such as peroxymonosulfates, at this point can provide substantial increases in pulp brightness without significant decreases in pulp viscosity. Peroxyacid bleaching according to the present invention is carried out at ambient temperature and no greater than about 40 °C and at an initial pH that is slightly alkaline and preferably about 7.25.

    SPLIT ALKALI ADDITION FOR HIGH CONSISTENCY OXYGEN DELIGNIFICATION
    3.
    发明授权
    SPLIT ALKALI ADDITION FOR HIGH CONSISTENCY OXYGEN DELIGNIFICATION 失效
    逐渐添加碱用于高浓度氧脱木素。

    公开(公告)号：EP0519061B1

    公开(公告)日：1995-08-30

    申请号：EP92904332.1

    申请日：1992-01-02

    申请人： UNION CAMP PATENT HOLDING, INC.

    发明人： TERRETT, Stuart, T. ,  EACHUS, Spencer, W. ,  GRIGGS, Bruce, F.

    IPC分类号： D21C9/10 ,  D21C9/147

    CPC分类号： D21C9/1005 ,  D21C9/147

    摘要： Unbleached pulp (8) is combined with an aqueous alkaline solution (10) while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased to above about 20 % (12). Additional alkali (18) is applied onto the high consistency pulp (17) to provide a total amount of between 0.8 and 7 % by weight of oven dry pulp. The high consistency alkali containing pulp is then treated with oxygen (21) to effect delignification (20). High strength, low lignin pulps are formed which may be further bleached (25) to high brightness with reduced amounts of chemicals by following the methods of the invention.

    SPLIT ALKALI ADDITION FOR HIGH CONSISTENCY OXYGEN DELIGNIFICATION
    4.
    发明公开
    SPLIT ALKALI ADDITION FOR HIGH CONSISTENCY OXYGEN DELIGNIFICATION 失效
    逐渐添加碱用于高浓度氧脱木素。

    公开(公告)号：EP0519061A1

    公开(公告)日：1992-12-23

    申请号：EP92904332.0

    申请日：1992-01-02

    申请人： UNION CAMP PATENT HOLDING, INC.

    发明人： TERRETT, Stuart, T. ,  EACHUS, Spencer, W. ,  GRIGGS, Bruce, F.

    IPC分类号： D21C ,  D21C9

    CPC分类号： D21C9/1005 ,  D21C9/147

    摘要： Une pâte écrue (8) est mélangée avec une solution alcaline (10) alors qu'elle présente une consistance faible afin qu'une première quantité de substance alcaline soit uniformément distribuée à travers toute la pâte. La consistance de la pâte est alors augmentée jusqu'à plus de 20 % en poids environ (12). On applique une substance alcaline additionnelle (18) à la pâte à consistance élevée(17) pour obtenir une teneur totale en alcali comprise entre 0,8 et 7 % en poids basé sur le poids à sec à l'étuvé de la pâte. La pâte à consistance élevée et contenant des alcalis est alors traitée à l'oxygène (21) pour effectuer la délignification (20). On obtient des pâtes à résistance élevée et à faible teneur en lignine, qui peuvent être davantage blanchies (25) jusqu'à atteindre une blancheur élevée en utilisant des quantités réduites de produits chimiques et selon les procédés de l'invention.

    ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS
    5.
    发明授权
    ENVIRONMENTALLY IMPROVED PROCESS FOR BLEACHING LIGNOCELLULOSIC MATERIALS 失效
    漂白木质纤维材料环保工艺。

    公开(公告)号：EP0483163B1

    公开(公告)日：1995-05-10

    申请号：EP90908787.6

    申请日：1990-05-17

    申请人： UNION CAMP PATENT HOLDING, INC.

    发明人： GRIGGS, Bruce, F. ,  GANDEK, Thomas, P. ,  PIKULIN, Michael, A. ,  ROSEN, Allen

    IPC分类号： D21C9/153 ,  D21C9/147 ,  D21C9/10

    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.

    Use of wash press for pulp alkali addition process
    6.
    发明公开
    Use of wash press for pulp alkali addition process 失效
    Verwendung von einer Waschpresse unter Zugabe von Alkali zum Zellstoff。

    公开(公告)号：EP0530881A1

    公开(公告)日：1993-03-10

    申请号：EP92202469.0

    申请日：1992-08-11

    申请人： UNION CAMP PATENT HOLDING, INC.

    发明人： Joseph, James C. ,  Matthews, Christopher H. ,  Terrett, Stuart T. ,  Eachus, Spencer W. ,  Griggs, Bruce F.

    IPC分类号： D21C9/10 ,  D21C9/147 ,  D21C9/02

    CPC分类号： D21C9/1005 ,  D21C9/02 ,  D21C9/147

    摘要： Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency (9) to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased (12) to above about 18%, and the high consistency alkali containing pulp is then treated with oxygen (21) to effect delignification (20). Additional alkali may be applied onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7% by weight of oven dry pulp. The invention contemplates the use of one or more wash presses (7,30) for reducing the overall amounts of alkaline material utilized in the process. High strength, low lignin pulps (25) are subsequently formed which may be further bleached to high brightness with reduced amounts of chemicals by following the methods of the invention.

    摘要翻译： 未漂白的纸浆与碱性水溶液结合，同时处于低稠度（9）的状态，以将第一量的碱性材料基本均匀地分布在整个纸浆中。 然后将纸浆的稠度增加（12）至约18％以上，然后用氧气（21）处理高浓度含碱纸浆以进行脱木质素（20）。 在氧脱木素之前，可以将额外的碱施加到高浓度纸浆上，以提供总量为烘箱干浆的0.8至7重量％。 本发明考虑使用一种或多种洗涤压力机（7,30）来减少在该方法中使用的碱性物质的总量。 随后形成高强度，低木质素纸浆（25），其可以通过遵循本发明的方法进一步漂白至高亮度，具有减少量的化学品。

    Two stage pulp bleaching reactor
    7.
    发明公开
    Two stage pulp bleaching reactor 失效
    Zweistufige Reaktor zum Bleichen von Zellstoff。

    公开(公告)号：EP0515303A1

    公开(公告)日：1992-11-25

    申请号：EP92610036.3

    申请日：1992-05-19

    申请人： UNION CAMP PATENT HOLDING, INC.

    发明人： Pikulin, Michael A. ,  Friend, William H.

    IPC分类号： D21C9/10 ,  D21C9/153

    CPC分类号： D21C9/153 ,  D21C9/1057

    摘要： A two stage ozone-pulp bleaching method and apparatus are disclosed. In the first stage, high consistency pulp particles are turbulently mixed and contacted with a gaseous mixture containing ozone to mix and contact substantially all of the pulp particles with ozone to react at least a portion of the pulp particles with the ozone. Pulp particles and gaseous bleaching mixture are then directed to a second stage including a quiescent pulp bed. Pulp particles may complete their reaction in the bed, which also serves to strip ozone which was not contacted with pulp particles in the first stage from the gaseous bleaching mixture.

    摘要翻译： 公开了两阶段臭氧纸浆漂白方法和装置。 在第一阶段，将高稠度纸浆颗粒湍流混合并与含有臭氧的气体混合物接触，以与臭氧混合并接触基本上所有的纸浆颗粒，以使至少一部分纸浆颗粒与臭氧反应。 然后将纸浆颗粒和气态漂白混合物引导到包括静止纸浆床的第二阶段。 纸浆颗粒可以在床中完成它们的反应，其也用于从气态漂白混合物中除去在第一阶段不与纸浆颗粒接触的臭氧。