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    Method and apparatus for pulping sawdust
    2.
    发明申请
    Method and apparatus for pulping sawdust 失效
    制浆锯屑的方法和装置

    公开(公告)号：US20020026990A1

    公开(公告)日：2002-03-07

    申请号：US09981837

    申请日：2001-10-19

    申请人： ANDRITZ-AHLSTROM INC.

    发明人： Jay J. Miele ,  Marco Marois ,  R. Fred Chasse ,  J. Wayne Chamblee ,  John D. Weston ,  J. Robert Prough

    IPC分类号： D21C003/26 ,  D21C007/06 ,  D21C007/08 ,  D21C009/02 ,  D21C001/02

    CPC分类号： D21C3/24 ,  D21C1/02 ,  D21C3/266

    摘要： Chemical cellulose pulp is made from sawdust utilizing a static down-flow retention vessel. By adding steam and cooking liquor to a flow of sawdust a heated slurry, at a cooking temperature of about 250-350null F., is produced. The heated slurry is, at superatmospheric pressure, moved downwardly in the static down-flow retention vessel while cooking temperature is maintained, for a time period of about 0.5-6 (preferably 1 to 3) hours, the slurry having a consistency of about 5-30%. At superatmospheric pressure, without significant reduction in pressure from the retention vessel, the slurry is cooled to well below cooking temperature by diffusing cooling liquid through it, as in a conventional pressure diffuser. The discharge from the retention vessel is preferably substantially solely gravity action (e.g. using a discharge with single convergence and side relief). Various mixing, diluting, thickening, steaming, and pumping devices are utilized in the system from initial steaming of the sawdust to passage into the top of the retention vessel.

    摘要翻译： 化学纤维素纸浆使用静态下流保留容器由锯屑制成。 通过将蒸汽和蒸煮液添加到锯屑流中，在约250-350°F的烹饪温度下产生加热的浆料。 加热的浆料在超大气压力下在静态下流保持容器中向下移动，同时保持烹饪温度约0.5-6（优选1至3）小时的时间，该浆料具有约5的稠度 -30％。 在超大气压下，没有显着降低来自保留容器的压力，如常规压力扩散器那样，将冷却液通过其冷却而将浆料冷却到远低于烹调温度。 来自保留容器的排出物优选基本上仅仅是重力作用（例如，使用具有单一收敛和侧面释放的放电）。 在系统中使用各种混合，稀释，增稠，蒸汽和泵送装置，从初始蒸发锯屑到通入保留容器的顶部。

    Two-stage chemical treatment of mechanical wood pulp with sodium sulfite
    3.
    发明授权
    Two-stage chemical treatment of mechanical wood pulp with sodium sulfite 失效
    机械木浆与亚硫酸钠的两阶段化学处理

    公开(公告)号：US4502918A

    公开(公告)日：1985-03-05

    申请号：US385286

    申请日：1982-06-04

    申请人： David M. Mackie ,  Peter Joyce

    发明人： David M. Mackie ,  Peter Joyce

    IPC分类号： D21C3/22 ,  D21B1/02 ,  D21C3/26 ,  D21C9/10 ,  D21C3/04

    CPC分类号： D21B1/021 ,  D21C3/266

    摘要： A two-stage chemical treatment process is disclosed for increasing the density, strength and brightness properties of mechanical wood pulp. The method comprises the steps of: applying an aqueous solution of sodium sulfite in the range of about 1%-10% sodium sulfite based on bone dry weight of wood to wood particles, the solution having a pH in the range of about 4.5-11; heating the sodium sulfite treated wood particles to a temperature in the range of about 100.degree.-160.degree. C. and maintaining the particles in the temperature range for a period of time in the range of about 20 seconds to 10 minutes; refining the heated sodium sulfite treated wood particles into mechanical wood pulp; separating the pulp into a reject fraction and an accept fraction, the reject fraction containing a higher proportion of shives and long fiber material; applying an aqueous solution of sodium sulfite, in the range of about 4%-50% sodium sulfite based on bone dry weight of wood, to the reject fraction, the solution having a pH in the range of about 4.5-11; cooking the sodium sulfite treated reject fraction at a temperature in the range of about 100.degree.-160.degree. C. for a period of time in the range of about 2-120 minutes; refining the cooked sodium sulfite treated reject fraction; and recombining at least part of the refined reject fraction with at least part of the accept fraction.

    摘要翻译： 公开了一种用于增加机械木浆的密度，强度和亮度特性的两阶段化学处理方法。 该方法包括以下步骤：基于木材与木材颗粒的骨干重，将约1％-10％亚硫酸钠范围的亚硫酸钠水溶液施用，所述溶液的pH在约4.5-11的范围内 ; 将亚硫酸钠处理的木颗粒加热至约100-160℃的温度，并将颗粒保持在约20秒至10分钟范围内的温度范围内; 将加热的亚硫酸钠处理的木颗粒精炼成机械木浆; 将纸浆分离成废料部分和接收部分，废弃部分含有较高比例的肥料和长纤维材料; 将基于木材的骨干重的约4％-50％亚硫酸钠范围的亚硫酸钠水溶液施加到废弃部分，所述溶液的pH在约4.5-11的范围内; 在约100-116℃的温度范围内烹制经亚硫酸钠处理的废弃物级分，时间约为2-120分钟; 精炼煮熟的亚硫酸钠处理的废品级分; 并将至少部分精炼废弃物部分与至少部分接受部分重组。

    Method and apparatus for pulping cellulosic material using a vessel with an impergnation zone and an attrition zone
    7.
    发明授权
    Method and apparatus for pulping cellulosic material using a vessel with an impergnation zone and an attrition zone 失效
    使用具有不均匀区域和磨损区域的血管制浆纤维素材料的方法和设备

    公开(公告)号：US5500084A

    公开(公告)日：1996-03-19

    申请号：US310152

    申请日：1994-09-21

    申请人： Roger P. Hoffman

    发明人： Roger P. Hoffman

    IPC分类号： D21C1/10 ,  D21C3/26 ,  D21C7/00 ,  D21C7/08

    CPC分类号： D21C3/266 ,  D21C1/10

    摘要： A method and apparatus for the continuous production of cellulosic pulp for use in a papermaking process. The apparatus includes a vessel containing a pulping liquor and the vessel consists of a first impregnation zone and a second attrition zone. Wood chips are continuously fed into the upper end of the first zone and are subject to gentle agitation to impregnate the chips with the liquor. The impregnated chips then flow into the second zone where they are heated to a low temperature of 80.degree. to 120.degree. C. and subjected to more severe agitation to break down the chips and liberate the individual fibers. The liquid level in the first zone is higher than in the second zone, causing the liquid to flow upwardly in the second zone with the cooking liquor and the liberated fibers being continuously discharged from the upper end of the second zone, while larger wood chips are retained in the second zone for further attrition. The liberated fibers are removed from the cooking conditions as they are liberated to thereby prevent overcooking and discoloration of the pulp.

    摘要翻译： 用于连续生产用于造纸工艺的纤维素浆的方法和设备。 该装置包括容纳制浆液体的容器，容器由第一浸渍区和第二磨损区构成。 木屑连续地进入第一区域的上端，并受到温和的搅动，用液体浸渍碎屑。 浸渍的芯片然后流入第二区域，在那里它们被加热到80℃至120℃的低温，并进行更严格的搅拌以分解芯片并释放各个纤维。 第一区域中的液位高于第二区域，导致液体在烹饪液体的第二区域中向上流动，并且释放的纤维从第二区域的上端连续排出，而较大的木片是 保留在第二区进一步消耗。 释放的纤维在被释放时从蒸煮条件中除去，从而防止纸浆的过度煮焦和变色。

    Two stage process for sulfonating mechanical pulp fibers
    8.
    发明授权
    Two stage process for sulfonating mechanical pulp fibers 失效
    磺化机械纸浆纤维的两阶段工艺

    公开(公告)号：US4708771A

    公开(公告)日：1987-11-24

    申请号：US687977

    申请日：1984-12-31

    申请人： Serge B. Beaulieu

    发明人： Serge B. Beaulieu

    IPC分类号： D21C3/26 ,  D21C9/00 ,  D21C3/04

    CPC分类号： D21C9/004 ,  D21C3/266

    摘要： A two stage sulfonation system includes a mixing tank, a retention tank, a thickening press, a pressurized vessel, and a liquor recovery press in series relation.The system is designed to receive mechanical pulp, in a slurry form, first introduced into the mixing tank simultaneously with a metered charge of sodium sulfite solution from the holding tank, the sodium sulfite content of which is at a level from about 40 to about 200 g/l. The solution is mixed into the slurry to provide a relatively uniform and intimate contact thereof with its fiber content. This slurry is transferred to the retention tank and there held subject to a sub-boiling temperature between 140 to 210 degrees F., producing a first stage sulfonation of the fiber content. The slurry is then passed to the pressurized vessel, in the course of which it is subjected to a pressing action, extracting liquor which inherently contains a majority of the original sodium sulfite charge directed to the mixing tank. A second stage sulfonation occurs in the pressurized vessel, producing a fiber which after refining is suited for use as reinforcing pulp in newsprint or specialty grade paper, without need for addition of conventional chemical pulp.

    摘要翻译： 两阶段磺化体系包括混合槽，保留槽，增稠压机，加压容器和串联的液体回收机。 该系统被设计成接收以浆料形式的机械纸浆，首先通过来自储存罐的计量加入的亚硫酸钠溶液引入混合罐，亚硫酸钠含量为约40至约200 g / l。 将溶液混合到浆料中以提供与其纤维含量相对均匀且紧密的接触。 将该浆料转移到保留罐中，并保持在140至210华氏度之间的亚沸点温度，产生纤维含量的第一阶段磺化。 然后将浆料通入加压容器，在该压力容器中进行加压作用，提取固有地含有大部分原始的亚硫酸氢钠进料到混合罐中的液体。 在加压容器中发生第二阶段磺化，产生在精制后适合用作新闻纸或特种级纸中的增强纸浆的纤维，而不需要添加常规化学纸浆。

    Sodium sulfide pulping with hydrogen sulfide generation
    9.
    发明授权
    Sodium sulfide pulping with hydrogen sulfide generation 失效
    硫化氢硫化氢生成硫化氢

    公开(公告)号：US4113553A

    公开(公告)日：1978-09-12

    申请号：US763203

    申请日：1977-01-27

    申请人： Hans Olof Samuelson

    发明人： Hans Olof Samuelson

    IPC分类号： D21C3/02 ,  D21C3/26 ,  D21C11/12

    CPC分类号： D21C3/266 ,  Y10S423/03

    摘要： A process for pulping hardwood to produce cellulose pulp in good yield and of high quality, with a low requirement for causticized pulping liquor, which comprises in a first pulping stage pulping the hardwood in an alkaline pulping liquor containing sodium sulfide at a pH of about 10.5 to about 13 and at a temperature within the range from about 110.degree. to about 170.degree. C while generating hydrogen sulfide in situ by reaction of sodium sulfide with organic acids liberated in the pulping; and then in a second pulping stage, following directly after the first pulping stage, continuing the pulping at a pH higher than said first stage pH, within the range of about 12.5 to about 14 and at a temperature higher than said first stage temperature within the range from about 145.degree. to about 190.degree. C, in the presence of added alkaline pulping liquor comprising sodium hydroxide and sodium sulfide until cellulose pulp is produced.