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    CROSSLINKED CELLULOSE AS LOW-COST PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY
    1.
    发明申请
    CROSSLINKED CELLULOSE AS LOW-COST PRECURSOR IN PRODUCTION OF HIGH-GRADE CELLULOSE DERIVATIVES AND RELATED TECHNOLOGY 有权

    公开(公告)号：US20170247833A1

    公开(公告)日：2017-08-31

    申请号：US15067760

    申请日：2016-03-11

    Applicant: WEYERHAEUSER NR COMPANY

    Inventor： Mengkui Lou

    IPC: D21C9/00 ,  D21H13/04 ,  D21C9/18 ,  D21C9/147 ,  D21C9/10

    CPC classification number: D21C9/005 ,  C08B15/10 ,  C08H8/00 ,  D21C9/1063 ,  D21C9/147 ,  D21C9/18 ,  D21H13/04

    Abstract: A pulp in accordance with a particular embodiment includes crosslinked cellulose fibers. The pulp can have high brightness, reactivity, and intrinsic viscosity. The pulp, therefore, can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with a particular embodiment of the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. The bleaching process can reduce a lignin content of the pulp to less than or equal to 0.09% by oven-dried weight of the crosslinked cellulose fibers. Crosslinking the cellulose fibers can include exposing the cellulose fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175.

    Process for producing cellulose, and by-product
    5.
    发明申请
    Process for producing cellulose, and by-product 失效
    生产纤维素和副产物的方法

    公开(公告)号：US20020069983A1

    公开(公告)日：2002-06-13

    申请号：US09969616

    申请日：2001-10-03

    Applicant: Chempolis Oy

    Inventor： Pasi P. Rousu ,  Paivi P. Rousu ,  Esa J. Rousu

    IPC: D21C011/00 ,  D21C011/12 ,  D21C003/02

    CPC classification number: D21C11/0028 ,  C05D1/00 ,  D21C9/1063 ,  D21C11/0007

    Abstract: The invention relates to a process for producing cellulose and a fertilizer by-product by using a closed cycle of cooking chemicals and process waters. In the process of the invention, the pulp is bleached by at least partly using potassium hydroxide as a bleaching chemical. Thus, a bleach concentrate rich in potassium is obtained from the bleach filtrate, which bleach concentrate is combined with ashes obtained from the burning of lignin and other organic matter recovered from pulp production as a by-product, in order to be used as a potash fertilizer. The bleach concentrate can also be used as a potash fertilizer as such. The invention also relates to a potash fertilizer obtained this way.

    Abstract translation: 本发明涉及通过使用烹饪化学品和处理水的封闭循环来生产纤维素和副产物的方法。 在本发明的方法中，纸浆通过至少部分地使用氢氧化钾作为漂白化学品漂白。 因此，从漂白滤液中获得富含钾的漂白浓缩物，漂白浓缩物与作为副产物从纸浆生产回收的木质素和其它有机物质的燃烧中获得的灰分相结合，以便用作钾盐 肥料。 漂白浓缩物也可以作为钾肥使用。 本发明还涉及以这种方式获得的钾肥。

    Oxidative delignification of wood or wood pulp by transition metal-substituted polyoxometalates
    6.
    发明授权
    Oxidative delignification of wood or wood pulp by transition metal-substituted polyoxometalates 失效

    公开(公告)号：US5695606A

    公开(公告)日：1997-12-09

    申请号：US664488

    申请日：1996-06-17

    Applicant: Rajai H. Atalla

    Inventor： Rajai H. Atalla

    IPC: C08L97/00 ,  D21C9/10 ,  D21C9/00

    CPC classification number: D21C9/1057 ,  D21C9/1063

    Abstract: A method for delignifying wood pulp and fiber is disclosed. The method comprises the steps of obtaining a wood pulp and exposing the wood pulp to a polyoxometalate of the formula �V.sub.l Mo.sub.m W.sub.n Nb.sub.o Ta.sub.p (TM).sub.q X.sub.r O.sub.s !.sup.x- where l is 0-18, m is 0-40, n is 0-40, o is 0-10, p is 0-10, q is 0-9, r is 0-6, TM is a d-electron-containing transition metal ion, and X is a heteroatom, which is a p or d block element, where l+m+n+o+p.gtoreq.4, l+m+q>0 and s is sufficiently large that x>0. The exposure is under conditions wherein the polyoxometalate is reduced. In a preferable form of the invention, the method additionally comprises the step of reoxidizing the polyoxometalate.

    Delignification of wood pulp by vanadium-substituted polyoxometalates
    7.
    发明授权
    Delignification of wood pulp by vanadium-substituted polyoxometalates 失效
    通过钒取代的多金属氧酸盐脱木质木糖

    公开(公告)号：US5302248A

    公开(公告)日：1994-04-12

    申请号：US937634

    申请日：1992-08-28

    Applicant: Ira A. Weinstock ,  Craig L. Hill

    Inventor： Ira A. Weinstock ,  Craig L. Hill

    IPC: C08L97/00 ,  D21C9/10 ,  D21C3/00

    CPC classification number: D21C9/1057 ,  D21C9/1063

    Abstract: A method for delignifying wood pulp is disclosed. The method comprises the steps of obtaining a wood pulp and exposing the wood pulp to a polyoxometalate of the formula [V.sub.n Mo.sub.m W.sub.l Nb.sub.o Ta.sub.p (TM).sub.q (MG).sub.r O.sub.s ].sup.x- where n is 1-18, m is 0-40, l is 0-40, o is 0-10, p is 0-10, q.ltoreq.6, r.ltoreq.6, TM is a d-electron-containing transition metal ion, and MG is a main group ion, provided that n+m+o+l+p.gtoreq.4 and s is sufficiently large that x>o. The exposure is under conditions wherein the polyoxometalate is reduced. In a preferable form of the invention, the method additionally comprises the step of reoxidizing the polyoxometalate.

    Abstract translation: 公开了木浆脱木素的方法。 该方法包括以下步骤：获得木浆并将木浆暴露于式（VnMomWlNboTap TM q（MG）rO）x-的多金属氧酸盐，其中n为1-18，m为0-40，l为0 -40，o为0-10，p为0-10，q <= 6，r = 6，TM为含d电子的过渡金属离子，MG为主族离子，条件是n + m + o + 1 + p> = 4，s足够大，使得x> o。 暴露在多金属氧酸盐被还原的条件下。 在本发明的优选形式中，该方法另外包括再氧化多金属氧酸盐的步骤。

    HIGH BRIGHTNESS NON-WOOD PULP
    9.
    发明公开
    HIGH BRIGHTNESS NON-WOOD PULP 审中-公开

    公开(公告)号：US20230407562A1

    公开(公告)日：2023-12-21

    申请号：US18251961

    申请日：2021-11-05

    Applicant: Kimberly-Clark Worldwide, Inc.

    Inventor： Thomas G. Shannon ,  Samantha C. Ackerly ,  Zhiying Yu ,  David J. Paulson ,  Ning Wei

    IPC: D21C9/10 ,  D21C3/02 ,  D21C1/10 ,  D21C9/00

    CPC classification number: D21C9/1063 ,  D21C3/02 ,  D21C1/10 ,  D21C9/007

    Abstract: Disclosed are non-wood pulps having a fiber length greater than about 1.70 mm and a brightness of about 80% or greater. The relatively high degree of brightness is achieved without a loss fiber length or pulp yield. The high degree of brightness and relatively long fiber length makes the pulps well suited for the manufacture of wet-laid fibrous products, particularly wet-laid tissue products. The pulps may be prepared from plants of the family Asparagaceae by mechanical pulping and more preferably by a chemi-mechanical pulping using a sodium hydroxide alkaline peroxide solution where the primary pulp is cleaned to reduce debris prior to bleaching. Preferably the cleaned primary pulp has less than about 5% debris prior to bleaching.

    High efficiency fiber bleaching process
    10.
    发明授权
    High efficiency fiber bleaching process 有权

    公开(公告)号：US11840805B2

    公开(公告)日：2023-12-12

    申请号：US18159700

    申请日：2023-01-26

    Applicant: GPCP IP Holdings LLC

    Inventor： Jeffrey A. Lee

    IPC: D21C9/16 ,  D21C9/10 ,  D21C5/02 ,  D21H11/14

    CPC classification number: D21C9/16 ,  D21C5/022 ,  D21C9/1057 ,  D21C9/1063 ,  D21C9/1084 ,  D21C9/163 ,  D21C9/166 ,  D21H11/14

    Abstract: A high efficiency bleaching method for cellulosic pulp includes: (a) providing a charge of aqueous cellulosic pulp to a bleaching vessel at a consistency of from 10% to 30% along with a peroxy bleaching agent and an alkaline agent effective to adjust pH of the charge to 9.5 to 12.5; and (b) bleaching the aqueous cellulosic pulp in the bleaching vessel while maintaining a bleaching temperature of from 110° F. (43° C.) to 135° F. (57° C.) and a pH of the charge from 9.5 to 12.5 for an extended bleaching retention time. The bleaching method is advantageously used to bleach low brightness recycle pulp, and/or as part of a multistage process with bleaching stages of lesser duration, and/or as a high peroxy efficiency, low dose bleaching process or in connection with concurrently storing and bleaching pulp.

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