公开(公告)号：US20230265609A1

公开(公告)日：2023-08-24

申请号：US18098490

申请日：2023-01-18

申请人： GPCP IP Holdings LLC

发明人： Jeffrey A. Lee ,  Kevin M. Holtman

IPC分类号： D21B1/02 ,  D21C9/10 ,  D21C9/16 ,  D21C3/02

CPC分类号： D21B1/026 ,  D21C9/1068 ,  D21C9/1005 ,  D21C9/163 ,  D21C3/026 ,  D21H11/02

摘要： A method of producing high yield chemical cellulosic pulp includes: (a) chemically pulping wood chips to separate lignin and liberate cellulosic fibers from the wood chips to generate a cellulosic pulp; (b) washing and screening the pulp of step (a); (c) pre-treating the washed pulp with oxygen; (d) optionally washing the treated pulp of step (c); (e) bleaching the pre-treated pulp in an extended duration oxidative bleaching stage; (f) optionally washing the bleached pulp of step (e); and (g) optionally further oxidatively or reductively bleaching the bleached pulp in a shorter duration bleaching stage, wherein the bleached pulp is produced at a yield of greater than 60% based on the weight of the pulped wood chips (dry basis).

公开(公告)号：US4445969A

公开(公告)日：1984-05-01

申请号：US449889

申请日：1982-12-16

申请人： Hans O. Samuelson

发明人： Hans O. Samuelson

IPC分类号： D21C9/147 ,  D21C9/10 ,  D21C1/04 ,  D21C3/16

CPC分类号： D21C9/1026 ,  D21C9/1068

摘要： A process for delignifying bleaching cellulose pulp in three stages, an activating stage, and first and second alkaline stages, NO and/or NO.sub.2 and O.sub.2, and optionally HNO.sub.3, being supplied to the water-containing pulp in the activating stage; in the first alkaline stage, alkali being supplied as carbonate, primarily HCO.sub.3.sup.-, with oxygen gas having a partial pressure, on average, of from 0 to 0.2 MPa, the lignin content of the pulp being lowered in this stage so that the Kappa number of the pulp after the stage is from 10 to 60% of the Kappa number of the pulp entering the activating stage; in the second alkaline stage, alkali being supplied as carbonate, primarily CO.sub.3.sup.=, with oxygen gas at a partial pressure, on average, of from 0.1 to 3 MPa.

摘要翻译： 将活化阶段中的漂白纤维素纸浆脱木质化的方法，活化阶段，第一和第二碱性阶段，NO和/或NO 2和O 2以及任选的HNO 3被提供给活化阶段的含水纸浆; 在第一碱性阶段，碱以碳酸盐（主要是HCO 3 - ）的形式供给，其中氧分压平均为0至0.2MPa，在该阶段纸浆的木质素含量降低，使得卡伯值 的浆液在进入活化阶段的纸浆的卡帕值的10至60％之间; 在第二碱性阶段，作为碳酸盐，主要是CO 3 =，以分压的氧气平均为0.1〜3MPa供给碱。

公开(公告)号：US4435085A

公开(公告)日：1984-03-06

申请号：US406112

申请日：1982-08-06

申请人： Oscar Luthi ,  Lawrence A. Carlsmith

发明人： Oscar Luthi ,  Lawrence A. Carlsmith

IPC分类号： B01F5/00 ,  B01F7/00 ,  D21C9/10 ,  B01F15/02 ,  B01F5/14

CPC分类号： B01F7/00775 ,  B01F7/00791 ,  D21C9/10 ,  D21C9/1068 ,  B01F2005/0008

摘要： Pulp and oxygen are mixed by feeding the pulp and also feeding the oxygen to a mixer which has a grooved rotor closely spaced between two grooved discs to provide high intensity mixing zones.

摘要翻译： 纸浆和氧气通过进料纸浆混合，并将氧气输送到混合器中，该混合器具有在两个槽形盘之间紧密间隔开的槽形转子，以提供高强度的混合区域。

公开(公告)号：US4295927A

公开(公告)日：1981-10-20

申请号：US48917

申请日：1979-06-15

申请人： Jozef M. Bentvelzen ,  Michael D. Meredith ,  Henry Bepple ,  Louis O. Torregrossa ,  Howard R. Battan ,  Dennis H. Justice

发明人： Jozef M. Bentvelzen ,  Michael D. Meredith ,  Henry Bepple ,  Louis O. Torregrossa ,  Howard R. Battan ,  Dennis H. Justice

IPC分类号： D21B1/16 ,  D21B1/34 ,  D21C9/00 ,  D21C9/10 ,  D21D1/30 ,  D21D5/28

CPC分类号： D21C9/004 ,  D21B1/16 ,  D21B1/342 ,  D21C9/1068 ,  D21D1/30

摘要： A wood pump slurry is treated with oxygen in a mill with little change to the process or structure of the mill. No special pressure tanks are required. The consistency of the pulp need not be altered for the treatment step. It may be treated at the usual process consistency of the pulp; e.g., it may be treated at the usual consistency of the pulp leaving a washer or subsequent steam mixer without additional dewatering or additional dilution.The oxygen is added into a closed section of the system so that it cannot immediately vent to the atmosphere. Alkali should also be present when the oxygen is mixed with the slurry. The mixing should occur near to the point of oxygen addition.The oxygen is inserted into the pulp slurry and mixed with the pulp slurry between a washer and the subsequent storage tank.The mixing occurs in a relatively small mixter that intensively mixes the slurry and gas. The mixer has a mixing zone with a swept area of 10,000 to 1,000,000 square meters per metric ton of oven-dry pulp. A preferred range is 25,000 to 150,000 square meters per metric ton of oven-dry pulp and an optimum range of around 65,400 square meters per metric ton of oven-dry pulp.Other systems and specific mixer designs are also disclosed.

摘要翻译： 在磨机中用氧气处理木浆泵浆料，对轧机的工艺或结构几乎没有变化。 不需要特殊的压力罐。 对于处理步骤，不需要改变纸浆的稠度。 可以按照纸浆的通常工艺一致性进行处理; 例如，可以以离开洗涤器或随后的蒸汽混合器的纸浆的通常稠度进行处理，而无需额外的脱水或额外的稀释。 将氧气加入系统的封闭部分，使其不能立即排放到大气中。 当氧气与浆料混合时，碱也应存在。 混合应发生在加氧附近。 将氧气插入纸浆中并与浆料在洗涤器和随后的储罐之间混合。 混合发生在相当小的混合器中，其密集地混合浆料和气体。 混合器具有混合区，扫地面积为10,000至100万平方米，每公吨烘干纸浆。 每公吨烘干纸浆的优选范围是25,000至15万平方米，每公吨干燥纸浆的最佳范围约为65,400平方米。 还公开了其他系统和特定混合器设计。

公开(公告)号：US3832276A

公开(公告)日：1974-08-27

申请号：US33886273

申请日：1973-03-07

申请人： INT PAPER CO

发明人： ROYMOULIK S ,  BROWN K

IPC分类号： D21C9/147 ,  D21C9/10

CPC分类号： D21C9/1068

摘要： COLLULOSE PULP IS CONTINUOUSLY BLEACHED AND DELIGNIFIED BY OXYGEN, WITHOUT REQUIRING THE USE OF A CELLULOSE DEPOLYMERIZATION PROTECTIVE AGENT, WHEREBY AN ALKALINE AQUEOUS PULP SLURRY OF A CONSISTENCY OF FROM ABOUT 2 TO 10%, HAVING A PH OF BETWEEN ABOUT 9 AND 14, A REACTION TEMPERATURE OF BETWEEN ABOUT 70* AND 120*C, WITH THE OXYGEN DISSOLVED AND INTIMATELY DISPERSED AND SUBDIVIDED INTO THE SLURRY SO THAT NO AGGLOMERATED BUBBLES ARE FORMED AND THE OXYGENATED PULP SLURRY HAS SUBSTANTIALLY NO BUBBLES EXCEEDING ABOUT 1/16 INCH IN DIAMETER, AND THEREAFTER CONTINUOUSLY INTRODUCING THE SLURRY INTO THE LOWER REGION OF A VERTICAL ELONGATED TOWER AND FLOWING THE SLURRY UPWARDLY THROUGH THE TOWER WITHOUT ANY SUBSTANTIAL AGITATION, SO AS TO GRADUALY DECREASE THE PRESSURE TO WHICH THE SLURRY IS OBJECTED AND CONTINUOUSLY WITHDRAWING TREATED SLURRY FROM THE UPPER REGION OF SAID TOWER.

公开(公告)号：US3024158A

公开(公告)日：1962-03-06

申请号：US74608658

申请日：1958-07-02

申请人： KIMBERLY CLARK CO

发明人： GRANGAARD DONALD H ,  SAUNDERS GEORGE H

IPC分类号： D21C9/10

CPC分类号： D21C9/1068

公开(公告)号：US4298427A

公开(公告)日：1981-11-03

申请号：US48947

申请日：1979-06-15

申请人： Jozef M. Bentvelzen ,  Michael D. Meredith ,  Louis O. Torregrossa ,  Henry Bepple

发明人： Jozef M. Bentvelzen ,  Michael D. Meredith ,  Louis O. Torregrossa ,  Henry Bepple

IPC分类号： D21C9/10

CPC分类号： D21C9/1068

摘要： A wood pulp slurry is treated with oxygen in a mill with little change to the process or structure of the mill. No special pressure tanks are rquired. The consistency of the pulp need not be altered for the treatment step. It may be treated at the usual process consistency of the pulp; e.g., it may be treated at the usual consistency of the pulp leaving a washer or subsequent steam mixer without additional dewatering or additional dilution.The oxygen is added into a closed section of the system so that it cannot immediately vent to the atmosphere. Alkali should also be present when the oxygen is mixed with the slurry. The mixing should occur near to the point of oxygen addition.An existing extraction stage within the system may be used as a source of alkali. In an existing extraction stage, the mixer and upstream oxygen line would be placed in the line between the steam mixer and the extraction tower.The mixing occurs in a relatively small mixer that intensively mixes the slurry and the gas. The mixer has a mixing zone with a swept area of 10,000 to 1,000,000 square meters per metric ton of oven-dry pulp. A preferred range is 25,000 to 150,000 square meters per metric ton of oven-dry pulp and an optimum range of around 65,400 square meters per metric ton of oven-dry pulp.Other systems and specific mixer designs are also disclosed.

摘要翻译： 在磨机中用氧气处理木浆浆料，对轧机的工艺或结构几乎没有变化。 没有特殊的压力罐被打。 对于处理步骤，不需要改变纸浆的稠度。 可以按照纸浆的通常工艺一致性进行处理; 例如，可以以离开洗涤器或随后的蒸汽混合器的纸浆的通常稠度进行处理，而无需额外的脱水或额外的稀释。 将氧气加入系统的封闭部分，使其不能立即排放到大气中。 当氧气与浆料混合时，碱也应存在。 混合应发生在加氧附近。 系统内的现有萃取阶段可用作碱源。 在现有的萃取阶段，混合器和上游氧气管线将被置于蒸汽混合器和萃取塔之间的管线中。 混合发生在相当小的混合器中，其密集地混合浆料和气体。 混合器具有混合区，扫地面积为10,000至100万平方米，每公吨烘干纸浆。 每公吨烘干纸浆的优选范围是25,000至15万平方米，每公吨干燥纸浆的最佳范围约为65,400平方米。 还公开了其他系统和特定混合器设计。

公开(公告)号：US4220498A

公开(公告)日：1980-09-02

申请号：US969495

申请日：1978-12-14

申请人： James R. Prough

发明人： James R. Prough

IPC分类号： D21C9/10

CPC分类号： D21C9/1068

摘要： A method and apparatus for the delignification of cellulosic fiber material to minimize the amount of reject material in the final pulp produced. The fiber material is digested, washed, oxygen delignified, and passed through a screening stage to provide a main pulp stream, and a reject stream from the separation stage. The flow and consistency of the separated reject material is determined, the reject material is refined, and sufficient chemical is added to the separated reject material, based upon the flow and consistency thereof, so that subsequent delignification of the reject material may be effected. This may be accomplished either by passing the reject material through a separate oxygen delignification stage and then returning it to the main pulp stream, or adding caustic to it and soaking it in a soak tank for predetermined period of time, and then returning it to the main pulp stream before the oxygen delignification stage therein.

摘要翻译： 一种用于纤维素纤维材料去木质化以最小化所生产的最终纸浆中的废料量的方法和装置。 纤维材料被消化，洗涤，氧脱木质素，并通过筛分阶段以提供主浆料流和来自分离阶段的废品流。 确定分离的废料的流动和一致性，根据其流动和一致性，对废料进行精炼，并将足够的化学品加入到分离的废料中，从而可以实现废料的后续脱木质化。 这可以通过将废料材料通过单独的氧脱木质阶段，然后将其返回到主浆料流，或者向其中加入苛性碱并将其浸泡在浸泡罐中预定的时间段内，然后将其返回到 在其中脱氧木质素阶段之前的主要纸浆流。

公开(公告)号：US4161421A

公开(公告)日：1979-07-17

申请号：US832875

申请日：1977-09-13

申请人： Michael I. Sherman

发明人： Michael I. Sherman

IPC分类号： D21C9/10 ,  D21C7/04 ,  D21C7/06

CPC分类号： D21C9/1068 ,  D21C9/10

摘要： A method and apparatus for continuous oxygen bleaching of cellulosic pulp is provided utilizing first and second pressurized chambers with a number of tubes in fluid communication with both of first and second chambers. Oxygen bearing fluid is intimately mixed with digested cellulosic pulp and is continuously fed under pressure to the first chamber. Communication is selectively provided between the first and second chambers through at least one of the tubular members to allow passage of pulp from the member to the second chamber. The tubular member through which pulp flows to the second chamber is progressively changed as are the members through which passage is blocked, so that the pulp remains within each tubular member sufficient time to allow oxygen-bleaching thereof without degradation, and passes through the members without channelling. The oxygen bleached pulp is continuously discharged from the second chamber. The passage of pulp through the tubular members may either be downwardly or upwardly. The passage between the blocked tubular members and the second chamber is blocked in the first chamber by a rotating plate, the plate having an aperture rotated into communication with each member in turn, the members disposed in a circle.

摘要翻译： 利用具有与第一和第二室两者流体连通的多个管的第一和第二加压室来提供用于纤维素浆的连续氧漂白的方法和装置。 含氧流体与消化的纤维素浆密切混合，并在压力下连续进料至第一室。 通过至少一个管状构件选择性地在第一和第二室之间提供通信，以允许纸浆从构件通到第二室。 纸浆流到第二室的管状构件随着通道被阻挡的构件逐渐变化，使得纸浆保持在每个管状构件中足够的时间以允许其脱氧而不劣化，并且通过构件而没有 引导。 氧漂白浆从第二室连续排出。 纸浆通过管状构件的通道可以是向下或向上。 阻塞的管状构件和第二腔室之间的通道通过旋转板在第一腔室中被阻挡，该板具有与每个构件相反地旋转的孔，该构件设置成圆形。

公开(公告)号：US4132589A

公开(公告)日：1979-01-02

申请号：US568055

申请日：1975-04-14

申请人： Per K. Christensen

发明人： Per K. Christensen

IPC分类号： D21C9/10

CPC分类号： D21C9/1068

摘要： Cellulose pulp is mixed with a base consisting of magnesium oxide, magnesium hydroxide or magnesium peroxide, and treated with oxygen gas at an elevated pressure, at a temperature in the range of 90.degree.-160.degree. C, preferably 120.degree.-140.degree. C for 0.5-6 hours in the absence of alkali metal hydroxide.

摘要翻译： 将纤维素纸浆与由氧化镁，氢氧化镁或过氧化镁组成的基料混合，并在升高的压力下在90-160℃，优选120-140℃的温度下用氧气处理，用于 在不含碱金属氢氧化物的情况下为0.5-6小时。