公开(公告)号：US11661704B2

公开(公告)日：2023-05-30

申请号：US17388006

申请日：2021-07-29

Applicant: GP CELLULOSE GMBH

Inventor： Arthur James Nonni ,  Charles E. Courchene ,  Harry R. Bartges ,  James M. Keough ,  William A. Howell ,  Jeremy M. Carter ,  Blair R. Carter ,  Christopher M. Slone ,  Philip A. Powers ,  Steven T. Haywood

IPC: D21H11/04 ,  D21C9/10 ,  D21C1/04 ,  D21C3/02 ,  D21C9/02 ,  D21C9/14 ,  D21C9/16 ,  D21C1/02

CPC classification number: D21H11/04 ,  D21C1/02 ,  D21C1/04 ,  D21C3/02 ,  D21C3/022 ,  D21C9/02 ,  D21C9/1036 ,  D21C9/1057 ,  D21C9/1084 ,  D21C9/14 ,  D21C9/163

Abstract: This disclosure relates to methods of making novel dissolving wood pulps by processes comprising acid prehydrolysis, pulping, and a multi-stage bleaching process comprising oxidation with a catalyst and peroxide under acidic conditions, as well as to products made therefrom having a combination of medium-purity, low viscosity, and improved reactivity, filterability, and/or clogging that can be used as a substitute for traditional high-purity dissolving pulps in a wide variety of applications.

公开(公告)号：US09932709B2

公开(公告)日：2018-04-03

申请号：US13839091

申请日：2013-03-15

Applicant: Ecolab USA Inc.

Inventor： Prasad Y. Duggirala ,  Sergey M. Shevchenko

IPC: D21H17/09 ,  D21H17/10 ,  D21H17/66 ,  D21H17/15 ,  D21H21/28 ,  D21C9/10 ,  D21H21/14 ,  D21H21/30

CPC classification number: D21H17/09 ,  D21C9/1036 ,  D21C9/1042 ,  D21C9/1084 ,  D21H17/10 ,  D21H17/15 ,  D21H17/66 ,  D21H21/143 ,  D21H21/28 ,  D21H21/30

Abstract: Compositions and methods that preserve and enhance the brightness of pulp, and also improve the color of pulp or paper, when applied during different stages of a papermaking process, are disclosed. The compositions and methods maintain or enhance brightness, prevent yellowing, and enhance the performance of paper products. The compositions can include a mixture of reducing agents and can also include optical brighteners, chelants, polycarboxylates, or other additives. The mixture of reducing agents can include a borohydride, such as sodium borohydride, and any other reducing agent, such as a sulfite or bisulfite.

公开(公告)号：US08808500B2

公开(公告)日：2014-08-19

申请号：US13981211

申请日：2012-01-20

Applicant: Kevin Janak

Inventor： Kevin Janak

IPC: D21H21/36 ,  A01N59/08 ,  A01N35/02 ,  A01N25/22

CPC classification number: A01N59/14 ,  A01N35/00 ,  A01N59/00 ,  D21C5/005 ,  D21C9/08 ,  D21C9/1026 ,  D21C9/1084 ,  D21H17/11 ,  D21H21/36

Abstract: Microbial growth in an aqueous system containing borohydride residues is controlled by adding an aldehyde or aldehyde source, followed by adding an active halogen biocide. The active halogen biocide is preferably stabilized by an N-hydrogen compound.

Abstract translation: 通过加入醛或醛源，然后加入活性卤素杀生物剂来控制含有硼氢化物残基的含水体系中的微生物生长。 活性卤素杀生物剂优选由N-氢化合物稳定。

公开(公告)号：US07736463B1

公开(公告)日：2010-06-15

申请号：US09914650

申请日：2000-03-07

Applicant: Eric Yijing Zhang ,  Micael Axelfelt ,  Sverker Bengtsson ,  Charlotte Wancke Stahl ,  Johanna Magnusson

Inventor： Eric Yijing Zhang ,  Micael Axelfelt ,  Sverker Bengtsson ,  Charlotte Wancke Stahl ,  Johanna Magnusson

IPC: D21B1/16

CPC classification number: D21B1/16 ,  D21B1/021 ,  D21C9/1026 ,  D21C9/1084

Abstract: A method of manufacturing bleached mechanical and chemithermomechanical pulp is provided, having enhanced bleaching effect, wherein lignocellulose material is passed through at least one preheater or through a chemical treatment system, a steam separator and a refiner where the lignocellulose material is converted into a pulp suspension which, after steam separation, is passed at least to a storage vessel and to a screening department, from which the major part of the pulp suspension is separated as a substantially finished product or is separated and further treated. The reductive bleaching agent is added to the advancing pulp suspension without a bleaching tower. The method is characterized by adding the bleaching agent at a location downstream of the refiner and upstream of the screening department, and by bleaching the pulp under drastic conditions of temperature and minimized oxygen access at the location and immediately downstream of the location.

Abstract translation: 提供了制造漂白的机械和机械机械纸浆的方法，其具有增强的漂白效果，其中木质纤维素材料通过至少一个预热器或通过化学处理系统，蒸汽分离器和精制机，其中木质纤维素材料转化成纸浆悬浮液 在蒸汽分离后，其至少通过储存容器和筛选部门，大部分纸浆悬浮液从该分离部分被分离为基本成品，或者被分离并进一步处理。 将还原漂白剂加入到没有漂白塔的前进纸浆悬浮液中。 该方法的特征在于将漂白剂添加到精炼机下游和筛选部门上游的位置处，并通过在剧烈的温度条件下漂洗纸浆并最小化位置和位置下游的氧气通入。

公开(公告)号：US20070246176A1

公开(公告)日：2007-10-25

申请号：US11628961

申请日：2005-06-08

Applicant: Shoichi Miyawaki ,  Kazuhiro Kurosu ,  Takashi Ochi

Inventor： Shoichi Miyawaki ,  Kazuhiro Kurosu ,  Takashi Ochi

IPC: D21C9/10

CPC classification number: D21C9/1005 ,  D21C9/1084 ,  D21C9/16

Abstract: The present invention aims to further advance the acid treatment or irradiation technology for pulp to develop a bleaching process using smaller amounts of chlorine chemicals with higher efficiency as compared with conventional bleaching processes. It also aims to provide an excellent high brightness pulp having a low environmental impact and no discoloration as well as a paper containing it. The present invention provides a chlorine-free bleaching process with very high efficiency by irradiating a pulp washed after an acid treatment with UV light and/or visible light at a wavelength of 100-400 nm under alkaline conditions, preferably in a pH range of 10-13. The acid treatment can be performed under conditions of pH 1-6 and a temperature of 80° C. or more. The irradiation treatment can be performed in the presence of at least one compound selected from the group consisting of reducing agents, peroxides, and hydrogen-donating organic compounds. The present invention also provides a high brightness chemical pulp having an ISO brightness of 88% or more and a brightness loss of 1.0% or less in a specific fading test.

Abstract translation: 本发明旨在进一步推进纸浆的酸处理或照射技术，与常规漂白方法相比，使用较少量的氯化学品与更高效率开发漂白工艺。 它还旨在提供具有低环境影响和不变色的优异的高亮度纸浆以及含有它的纸。 本发明通过在碱性条件下，优选在pH范围为10的范围内，用紫外光和/或波长为100-400nm的紫外线和/或可见光照射经过酸洗处理的纸浆，提供了非常高的效率的无氯漂白方法 -13。 酸处理可以在pH 1-6和温度为80℃以上的条件下进行。 辐射处理可以在至少一种选自还原剂，过氧化物和给氢有机化合物的化合物存在下进行。 本发明还提供了在特定的褪色试验中，ISO亮度为88％以上，亮度损失为1.0％以下的高亮度化学纸浆。

公开(公告)号：US20040211533A1

公开(公告)日：2004-10-28

申请号：US10832182

申请日：2004-04-26

Inventor： Qiang Huang ,  Rangamannar Goda ,  Thomas Robert Crowley ,  Joseph Bettano

IPC: D21C005/02 ,  D21C003/02 ,  D21C003/06 ,  D21C009/12

CPC classification number: D21C9/1057 ,  D21C5/02 ,  D21C9/1084 ,  Y02W30/648

Abstract: A method for bleaching and color stripping recycled fibers by treating the fibers with a mixture of sodium borohydride and sodium bisulfite.

Abstract translation: 通过用硼氢化钠和亚硫酸氢钠的混合物处理纤维来漂白和着色再循环纤维的方法。

公开(公告)号：US20040188043A1

公开(公告)日：2004-09-30

申请号：US10823900

申请日：2004-04-14

Inventor： Ronald C. Naddeo

IPC: D21C009/10 ,  D21C005/02

CPC classification number: D21C9/1084

Abstract: A process for bleaching substantially lignin-free pulp or paper in a single-stage bleaching process or multi-stage bleaching process; comprising contacting said substantially lignin-free pulp or paper with an aqueous reductive bleaching solution comprising hydroxymethane sulfinic acid during a reductive bleaching stage for sufficient amount of time to at least partially bleach said substantially lignin-free pulp or paper.

Abstract translation: 在单级漂白工艺或多级漂白工艺中漂白基本上不含木质素的纸浆或纸的方法; 包括在还原漂白阶段使所述基本上不含木质素的纸浆或纸与包含羟基甲烷亚磺酸的水性还原漂白溶液接触足够的时间以使所述基本上不含木质素的纸浆或纸至少部分漂白。

公开(公告)号：US20030155085A1

公开(公告)日：2003-08-21

申请号：US10078095

申请日：2002-02-15

Inventor： Ronald C. Naddeo

IPC: D21C005/02 ,  D21C003/20 ,  D21C003/04 ,  D21C009/10

CPC classification number: D21C9/1084

Abstract: A process for bleaching substantially lignin-free pulp or paper in a single-stage bleaching process or multi-stage bleaching process; comprising contacting said substantially lignin-free pulp or paper with an aqueous reductive bleaching solution comprising hydroxymethane sulfinic acid during a reductive bleaching stage for sufficient amount of time to at least partially bleach said substantially lignin-free pulp or paper.

Abstract translation: 在单级漂白工艺或多级漂白工艺中漂白基本上不含木质素的纸浆或纸的方法; 包括在还原漂白阶段使所述基本上不含木质素的纸浆或纸与包含羟基甲烷亚磺酸的水性还原漂白溶液接触足够的时间以使所述基本上不含木质素的纸浆或纸至少部分漂白。

公开(公告)号：US3100732A

公开(公告)日：1963-08-13

申请号：US84418259

申请日：1959-10-05

Applicant: DU PONT

Inventor： SMEDBERG GEORGE E

IPC: D21C9/10

CPC classification number: D21C9/1084

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.