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170 条记录 (耗时 0.031 秒)

    Method for producing bleached wood fibre material
    1.
    发明授权
    Method for producing bleached wood fibre material 有权

    公开(公告)号：US11725338B2

    公开(公告)日：2023-08-15

    申请号：US17307060

    申请日：2021-05-04

    申请人： BASF SE

    发明人： Stefan Erren ,  Dieter Schönhaber ,  Martin Schachtl ,  Pavel Vassilievitch Osipov

    IPC分类号： D21B1/02 ,  D21B1/14 ,  D21C9/10

    CPC分类号： D21B1/021 ,  D21B1/14 ,  D21C9/1005 ,  D21C9/1057 ,  D21C9/1063 ,  D21C9/1089

    摘要： In a process for producing bleached mechanical woodpulp, said process comprising the steps of



    a) delaminating comparatively large particles of wood, which have optionally been pretreated with chemicals and/or water, into modified particles of wood,
    b) grinding the modified particles of wood from a) in one or more refiners,
    c) optionally treating the stalk obtained in step b) with oxidative or reductive bleaching agents, a composition Z is present during step a) and/or step b), said composition Z comprising one or more of the following components (Z1) to (Z3): a salt of dithionous acid H2S2O4 (Z1), a dithionous acid or dithionous acid derivative generator compound (Z2), a salt of sulfurous acid (sulfite) plus sodium tetraborohydride (Z3) and also optionally additives (Z4).

    Apparatus and method for washing pulps
    5.
    发明授权
    Apparatus and method for washing pulps 有权
    洗浆纸的设备和方法

    公开(公告)号：US08052839B2

    公开(公告)日：2011-11-08

    申请号：US11574687

    申请日：2005-09-07

    申请人： Olavi Pikka ,  Pekka Tervola ,  Hannu Rönkönharju

    发明人： Olavi Pikka ,  Pekka Tervola ,  Hannu Rönkönharju

    IPC分类号： D21C9/02

    CPC分类号： D21C9/06 ,  D21C9/1057

    摘要： An apparatus for treating pulp including: at least one liquid-permeable surface rotating around a shaft, onto which surface a pulp layer is formed; a feeder to feed pulp to the apparatus for treatment on the liquid-permeable surface; an internal barrier defining a first pulp treatment section and a second pulp treatment section; the first treatment section receiving from the feeder a first type of pulp and the second treatment section receiving from the feeder a second type of pulp, wherein the first type of pulp is supplied to the feeder from a first pulp treatment stage in a pulping system and the second type of pulp is supplied to the feeder from a second pulp treatment stage in the pulping system, and a pulp discharge to discharge treated pulp from the apparatus, wherein the pulp discharge discharges the first type of pulp after treatment separately from discharging the second type of pulp after treatment, and a filtrate discharge to discharge filtrate flowing through the liquid-permeable from the apparatus.

    摘要翻译： 一种用于处理纸浆的设备，包括：围绕轴旋转的至少一个液体可透过表面，在其上形成纸浆层的表面; 用于将纸浆输送到用于在液体可渗透表面上处理的设备的进料器; 限定第一纸浆处理部分和第二纸浆处理部分的内部屏障; 所述第一处理部从所述进料器接收第一类型的纸浆，并且所述第二处理部分从所述进料器接收第二类型的纸浆，其中所述第一类型的纸浆从制浆系统中的第一纸浆处理阶段供应到所述进料器， 第二类型的纸浆从制浆系统中的第二纸浆处理阶段供给到进料器，并且纸浆排出物从设备中排出经处理的纸浆，其中纸浆排出将处理后的第一种纸浆排放出来，排出第二种纸浆 处理后的纸浆类型和滤液排出物排出流过可透过液体的滤液。

    Method of xylanase treatment in a chlorine dioxide bleaching sequence
    6.
    发明授权
    Method of xylanase treatment in a chlorine dioxide bleaching sequence 失效
    在二氧化氯漂白顺序中木聚糖酶处理方法

    公开(公告)号：US07320741B2

    公开(公告)日：2008-01-22

    申请号：US10466640

    申请日：2002-01-18

    申请人： Jeffrey S. Tolan ,  Corina Popovici ,  Luc Thibault

    发明人： Jeffrey S. Tolan ,  Corina Popovici ,  Luc Thibault

    IPC分类号： D21C3/18

    CPC分类号： D21C9/1057 ,  D21C5/005

    摘要： A method of bleaching chemical pulp with xylanase after chemical bleaching is provided. The method comprises the steps of exposing chemical pulp to a chlorine dioxide bleaching stage to produce a partially bleached pulp, treating the partially bleached pulp with a xylanase in an enzyme treatment stage at a pH of about 3 to about 8, then carrying out an alkaline extraction of the pulp. The pulp bleaching method of the present invention may be performed in a pulp mill as part of a complex pulp bleaching process.

    摘要翻译： 提供了化学漂白后用木聚糖酶漂白化学纸浆的方法。 该方法包括以下步骤：将化学纸浆暴露于二氧化氯漂白阶段以产生部分漂白的纸浆，在约3至约8的pH的酶处理阶段用木聚糖酶处理部分漂白的纸浆，然后进行碱 提取纸浆。 本发明的纸浆漂白方法可以在纸浆厂中进行，作为复杂纸浆漂白方法的一部分。

    Process for high temperature peroxide bleaching of pulp with cool discharge
    8.
    发明申请
    Process for high temperature peroxide bleaching of pulp with cool discharge 有权
    用于高温过氧化物漂白纸浆的方法，具有冷却排放

    公开(公告)号：US20050279467A1

    公开(公告)日：2005-12-22

    申请号：US10872450

    申请日：2004-06-22

    申请人： Hazen Thomas ,  Wayne Winkler ,  Jeffrey Lee

    发明人： Hazen Thomas ,  Wayne Winkler ,  Jeffrey Lee

    IPC分类号： D21C1/00 ,  D21C9/10 ,  D21C9/16 ,  D21C11/00

    CPC分类号： D21C9/163 ,  D21C9/1042 ,  D21C9/1057

    摘要： A process for high temperature peroxide bleaching of pulp in which pulp is retained at high temperature and pressure to increase bleaching activity but in which the pulp is cooled prior to discharge from the pressure vessel below the flash point thereby resulting in lower energy, nonviolent discharge. Through the use of a heat exchanger, the cooling of the pulp can be performed using recycled filtrate containing residual peroxide, which encourages further bleaching during atmospheric retention. The heat exchanger is also used to heat a water stream, which can be used earlier in the pulping process, resulting in cost savings because energy within the system is retained to a greater degree.

    摘要翻译： 用于高温过氧化物漂白纸浆的方法，其中纸浆在高温和高压下保持以增加漂白活性，但是在从低压闪蒸点排出之前将纸浆冷却，从而导致较低的能量，非暴露的排放。 通过使用热交换器，可以使用含有残余过氧化物的再循环滤液进行纸浆的冷却，这促进了在大气保留期间的进一步漂白。 热交换器也用于加热水流，其可以在制浆过程中较早使用，从而节省成本，因为系统内的能量被更大程度地保持。

    Process for bleaching Kraft pulp
    9.
    发明申请
    Process for bleaching Kraft pulp 审中-公开
    漂白牛皮纸浆的方法

    公开(公告)号：US20050133173A1

    公开(公告)日：2005-06-23

    申请号：US11014289

    申请日：2004-12-16

    申请人： Bimal Khandelwal

    发明人： Bimal Khandelwal

    IPC分类号： D21C3/02 ,  D21C9/10 ,  D21C9/12 ,  D21C9/14 ,  D21C9/16

    CPC分类号： D21C9/123 ,  D21C3/02 ,  D21C9/1057

    摘要： An improved process for bleaching Kraft pulp is disclosed. The improved process involves the use of hydrogen peroxide to treat brownstock before treatment with chlorine or chlorine containing compounds. The process may also be used to treat recycle pulp.

    摘要翻译： 公开了一种漂白牛皮纸浆的改进方法。 改进的方法涉及使用过氧化氢来处理含有氯或氯的化合物的处理前的原料。 该方法也可用于处理再循环纸浆。

    Method for bleaching paper pulp with organic peracids followed by peroxide and sodium hydroxide
    10.
    发明授权
    Method for bleaching paper pulp with organic peracids followed by peroxide and sodium hydroxide 有权
    用有机过酸漂白纸浆，然后用过氧化氢和氢氧化钠漂白的方法

    公开(公告)号：US06866749B2

    公开(公告)日：2005-03-15

    申请号：US10380066

    申请日：2001-09-14

    申请人： Michel Delmas ,  Gérard Avignon

    发明人： Michel Delmas ,  Gérard Avignon

    IPC分类号： D21C9/10 ,  D21C9/16

    CPC分类号： D21C9/166 ,  D21C9/101 ,  D21C9/1057 ,  D21C9/163

    摘要： The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 DEG C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.

    摘要翻译： 本发明涉及一种在大气压和不高于100℃的温度下两步漂白不同类型纸浆的方法。第一步是使未漂白的糊料与对乙酸和苯甲酸的混合物接触。 第二步是用苏打和过氧化氢溶液处理来自第一步的漂白纸浆。 所得纸浆表现出高的白度指数和接近未漂白纸浆的聚合度。 该方法环保无污染。