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    Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream
    3.
    发明授权
    Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream 失效
    纸浆漂白方法，其中臭氧漂白废物流被洗涤以形成含氧流

    公开(公告)号：US06210527B1

    公开(公告)日：2001-04-03

    申请号：US08213290

    申请日：1994-03-14

    Applicant: Mark J. Kirschner ,  Rustam H. Sethna

    Inventor： Mark J. Kirschner ,  Rustam H. Sethna

    IPC: D21C1104

    CPC classification number: D21C9/153 ,  D21C9/147

    Abstract: A method for producing bleached wood pulp in which wood chips are digested in polysulfide liquor to produce brown stock pulp. The brown stock pulp is washed to produce washed brown stock wood pulp and weak black liquor and the washed wood pulp is then delignified in an oxygen delignification stage to produce oxygen delignified wood pulp. The delignified wood pulp is then ozone bleached in an ozone bleaching stage in which a waste stream principally containing ozone, carbon dioxide and oxygen is produced. The ozone-bleached pulp is introduced into an extractive oxidation stage which can include peroxide to further bleach the pulp and the product of the extractive oxidation stage is then either introduced into either a peroxide or chlorine dioxide bleaching stage. The waste stream is recovered and scrubbed with either white liquor, oxidized white liquor, or fully oxidized white liquor either in a separate scrubber or during oxidation reactions occurring in either polysulfide, white liquor or complete white liquor production stages. The scrubbing with white liquor or oxidized white liquor removes ozone and carbon dioxide so that the scrubbed stream can be utilized in the oxygen delignification stage. This eliminates the need for ozone destruct units. Moreover, the polysulfide liquor is utilized in the digestion of the wood pulp and the thiosulfate liquor is used in the oxygen delignification of the washed wood pulp. The fully oxidized white liquor can be utilized within the extractive oxidation stage and optionally can be used in a peroxide bleaching stage if present. The oxygen removed from the scrubbed stream can be balanced with oxygen demand of the foregoing stages.

    Abstract translation: 一种生产漂白木浆的方法，其中木屑在多硫化物液中消化以产生棕色浆料。 洗涤棕色浆料以产生洗涤的棕色木浆和弱黑液，然后在氧脱木质阶段脱水，然后将经洗涤的木浆脱木质，以生产脱木质木材纸浆。 然后将脱木质木浆臭氧漂白在臭氧漂白阶段，其中产生主要含有臭氧，二氧化碳和氧的废物流。 将臭氧漂白的纸浆引入萃取氧化阶段，其可以包括过氧化物以进一步漂白纸浆，然后将萃取氧化阶段的产物引入过氧化物或二氧化氯漂白阶段。 在单独的洗涤器中或在发生在多硫化物，白液或完全白液生产阶段的氧化反应期间，用白液，氧化白液或完全氧化的白液回收废物流并进行洗涤。 用白液或氧化白液进行洗涤除去臭氧和二氧化碳，使得洗涤流可用于脱氧脱氧阶段。 这消除了臭氧破坏装置的需要。 此外，多硫化物液体用于木浆的消化，硫代硫酸盐溶液用于洗涤过的木浆的氧脱木质素。 完全氧化的白液可用于萃取氧化阶段，任选地可用于过氧化物漂白阶段（如果存在）。 从洗涤流中除去的氧可以与上述阶段的氧需求平衡。

    Oxygen delignification method incorporating wood pulp mixing apparatus
    4.
    发明授权
    Oxygen delignification method incorporating wood pulp mixing apparatus 失效
    含木木浆混合装置的脱木素方法

    公开(公告)号：US5460696A

    公开(公告)日：1995-10-24

    申请号：US105248

    申请日：1993-08-12

    Applicant: Mark J. Kirschner ,  Rustam H. Sethna

    Inventor： Mark J. Kirschner ,  Rustam H. Sethna

    IPC: D21C9/10 ,  D21C9/147

    CPC classification number: D21C9/1005 ,  D21C9/10 ,  D21C9/147

    Abstract: An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located between mixing stages in which caustic is mixed with the wood pulp. The use of the plurality of mixing stages reduces peak pH exposure of the wood pulp that would otherwise occur if the charges of caustic and wood pulp were mixed all at once. Moreover, the caustic mixed in such manner replenishes neutralized caustic and ensures that the average pH level is increased above that in conventional oxygen delignification. The increase in average pH level favors an increase in the delignification. Filtrate from a washing stage is introduced into the mixing stages to prevent wood pulp degradation. Oxygen is mixed within the wood pulp by a wood pulp mixer that employs coaxial perforate passageways between which the wood pulp is retained and driven but which allow the oxygen to pass in an inward radial direction of the passageways to mix with the wood pulp.

    Abstract translation: 一种氧脱木素方法和设备，其中加热的木浆的装料在苛性苏打的存在下，在位于混合阶段之间的多个反应阶段中与氧反应，所述混合阶段中的苛性碱与木浆混合。 多个混合阶段的使用降低了木浆的峰值pH暴露，否则如果苛性碱和木浆的电荷一次全部混合，则可能会发生。 此外，以这种方式混合的苛性碱补充中和的苛性碱，并确保平均pH水平提高到高于常规氧脱木素中的水平。 平均pH值的增加有利于脱木质素的增加。 将来自洗涤阶段的滤液引入混合阶段以防止木浆降解。 氧气通过木浆混合器在木浆混合器中混合，该木浆混合器采用同轴穿孔通道，木浆在其间保持和驱动，但允许氧气通过通道的向内径向与木浆混合。

    Method of producing oxidized white liquor using dregs containing carbon particles
    7.
    发明授权
    Method of producing oxidized white liquor using dregs containing carbon particles 失效
    使用含有碳粒子的渣生产氧化白液的方法

    公开(公告)号：US5972165A

    公开(公告)日：1999-10-26

    申请号：US785262

    申请日：1997-01-17

    Applicant: Rustam H. Sethna ,  Mark J. Kirschner

    Inventor： Rustam H. Sethna ,  Mark J. Kirschner

    IPC: D21C11/00 ,  D21C11/04

    CPC classification number: D21C11/0078 ,  D21C11/0057

    Abstract: White liquor produced from black liquor is partially or completed oxidized. The white liquor contains dregs that are utilized as a carbon based catalyst. Dregs are produced by separating the dregs from green liquor an intermediate product between the black liquor and the oxidized white liquor. After formation of the oxidized white liquor, the dregs are separated therefrom to form a waste dreg stream which can be recycled so that part of the dregs present within the dregs containing white liquor stream to be oxidized is contributed by the waste dreg stream.

    Abstract translation: 由黑液产生的白液部分或完全氧化。 白液含有用作碳基催化剂的渣。 通过从白液中分离出黑液和氧化白液之间的中间产物来生产渣滓。 在形成氧化白液之后，从其中分离出渣以形成可循环使用的废渣流，使得含有待氧化的白液流的渣滓中存在的部分絮渣由废渣流引起。

    Wood pulp reactor
    8.
    发明授权
    Wood pulp reactor 失效
    木浆反应堆

    公开(公告)号：US5591308A

    公开(公告)日：1997-01-07

    申请号：US496264

    申请日：1995-06-28

    Applicant: Mark J. Kirschner ,  Rustam H. Sethna

    Inventor： Mark J. Kirschner ,  Rustam H. Sethna

    IPC: D21C9/10 ,  D21C9/147 ,  D21C7/00

    CPC classification number: D21C9/1005 ,  D21C9/10 ,  D21C9/147

    Abstract: An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located between mixing stages in which caustic is mixed with the wood pulp. The use of the plurality of mixing stages reduces peak pH exposure of the wood pulp that would otherwise occur if the charges of caustic and wood pulp were mixed all at once. Moreover, the caustic mixed in such manner replenishes neutralized caustic and ensures that the average pH level is increased above that in conventional oxygen delignification. The increase in average pH level favors an increase in the delignification. Filtrate from a washing stage is introduced into the mixing stages to prevent wood pulp degradation. Oxygen is mixed within the wood pulp by a wood pulp mixer that employs coaxial perforate passageways between which the wood pulp is retained and driven but which allow the oxygen to pass in an inward radial direction of the passageways to mix with the wood pulp.

    Abstract translation: 一种氧脱木素方法和设备，其中加热的木浆的装料在苛性苏打的存在下，在位于混合阶段之间的多个反应阶段中与氧反应，所述混合阶段中的苛性碱与木浆混合。 多个混合阶段的使用降低了木浆的峰值pH暴露，否则如果苛性碱和木浆的电荷一次全部混合，则可能会发生。 此外，以这种方式混合的苛性碱补充中和的苛性碱，并确保平均pH水平提高到高于常规氧脱木素中的水平。 平均pH值的增加有利于脱木质素的增加。 将来自洗涤阶段的滤液引入混合阶段以防止木浆降解。 氧气通过木浆混合器在木浆混合器中混合，该木浆混合器采用同轴穿孔通道，木浆在其间保持和驱动，但允许氧气通过通道的向内径向与木浆混合。

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