Per-compound (e.g., Peroxide, Perborate) Patents (Class 162/78)
  • Patent number: 10334874
    Abstract: Methods for producing dissolving grade pulp and microcrystalline cellulose from tobacco are provided. The methods include chemical pulping a tobacco input to form a tobacco pulp. Chemical pulping the tobacco input includes combining the tobacco input with a strong base defining a weight from about 5% to about 50% of the tobacco input, and heating the tobacco input and the strong base with an H-factor from about 500 to about 3,300. Further, the methods include bleaching the tobacco pulp to produce a dissolving grade pulp. Bleaching the tobacco pulp may include chlorination of the tobacco pulp with a chlorine dioxide solution, and caustic extraction of the tobacco pulp with a second strong base. A related tobacco-derived microcrystalline cellulose product is also provided, which can be used as a binder, a filler, and/or a texturizer in a tobacco product, such as a smokeless tobacco product.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: July 2, 2019
    Assignees: R. J. Reynolds Tobacco Company, North Carolina State University
    Inventors: Medwick Vaughan Byrd, Jr., Paul Stuart Chapman, Samuel Mark Debusk, Grady Lance Dooly, Anthony Richard Gerardi, David Neil McClanahan
  • Patent number: 10006169
    Abstract: Process for the delignification and bleaching of pulp, comprising a first bleaching stage with hydrogen peroxide in the presence of a molybdate or tungstate in an acidic aqueous mixture; subsequent to the first bleaching stage, a second bleaching stage with hydrogen peroxide in an alkaline aqueous mixture; and, subsequent to the second bleaching stage, a third bleaching stage with hydrogen peroxide in the presence of a molybdate or tungstate in an acidic aqueous mixture.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: June 26, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Thomas Dietz, Bernd Hopf, Ralf Grimmer, Sigrid Wegmann, Verena Illhardt
  • Patent number: 9783659
    Abstract: There are provided to a biodegradable composition containing ground cellulose having a diameter of 300 ?m to 1 nm, pulp, and water, a manufacturing method for the same, and a water-proof agent and a molded product using the composition. A molded product manufactured using the biodegradable composition of the present invention has a waterproofing function and an excellent strength for a certain period of time, and when the molded product is discarded, it is biodegraded without damage to the natural environment.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: October 10, 2017
    Inventor: Chan-oh Park
  • Patent number: 9057156
    Abstract: The invention is directed to a method for increasing brightness of pulp, wherein the method includes: contacting a pulp slurry with chlorine dioxide in a final D (ClO2) bleaching stage; and adding a brightening additive to the final D bleaching stage after at least a portion of the chlorine dioxide has been consumed, in an amount sufficient to increase brightness of the pulp; wherein the brightening additive is an inorganic compound chosen from hypochlorous acid, one or more precursor compounds that form hypochlorous acid in said final D bleaching stage, or a mixture thereof.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: June 16, 2015
    Assignee: SKZO NOBEL CHEMICALS INTERNATIONAL B.V.
    Inventors: Douglas W. Reid, John Atwood, Scott Carmichael, Daniel Connell
  • Publication number: 20150119838
    Abstract: A method of producing a modified pulp for use in paper or paper web products, the method comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amount of hemicellulose contained in the modified Kraft pulp is from about 5 to about 10% by dry weight of the modified pulp.
    Type: Application
    Filed: January 6, 2015
    Publication date: April 30, 2015
    Inventors: ZHENG TAN, GOPAL GOYAL, ALEXANDER A. KOUKOULAS
  • Publication number: 20150101771
    Abstract: A system and method of manufacturing a feedstock for producing paper fiber from fruit of a plant may include providing a by-product source inclusive of fiber from the edible fruit after a process for removing a majority of the edible fruit is used to produce a food. One or more treatment processes to brighten the fruit by-product may be performed. The feedstock may be produced from the brightened fruit by-product.
    Type: Application
    Filed: October 20, 2014
    Publication date: April 16, 2015
    Inventors: Peter R. MOSS, Doug A. BIPPERT, Rajesh Kumar GARG, Kim W. ROBINSON, Simon GAINEY, Philip G. CRANDALL
  • Patent number: 8940133
    Abstract: An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: January 27, 2015
    Assignee: The Research Foundation for The State University of New York
    Inventors: Thomas E. Amidon, Raymond Francis, Gary M. Scott, Jeremy Bartholomew, Bandaru V. Ramarao, Christopher D. Wood
  • Publication number: 20150007953
    Abstract: A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.
    Type: Application
    Filed: June 17, 2014
    Publication date: January 8, 2015
    Inventors: ZHENG TAN, DAMARIS LORENZONI, GOPAL GOYAL, SEN YANG
  • Publication number: 20140371442
    Abstract: A bleached softwood kraft pulp fiber with high alpha cellulose content and improved anti-yellowing is provided. Methods for making the kraft pulp fiber and products from it are also described.
    Type: Application
    Filed: January 11, 2013
    Publication date: December 18, 2014
    Applicant: GP Cellulose GmbH
    Inventors: Arthur J. Nonni, Charles E. Courchene, Phillip R. Campbell, Steven C. Dowdle, Joel Mark Engle
  • Patent number: 8906199
    Abstract: A process for the bleaching of wood pulp using one or more peroxide oxidising agents wherein the process includes treatment of the pulp with a mixture of chelating agents comprising: (a) a first chelating agent selected from the group consisting of: ethylenediamine N,N-disuccinic acid, methylglycinediacetic acid, glutamic acid N,N-diacetic acid, imino disuccinic acid and anions and mixtures thereof; and (b) a second chelating agent selected from the group consisting of: diethylene triamine pentaacetic acid, ethylenediamine tetraacetic acid, diethylenetriamine penta methylene phosphonic acid and anions and mixtures thereof.
    Type: Grant
    Filed: November 3, 2008
    Date of Patent: December 9, 2014
    Assignee: Innospec Limited
    Inventors: Matthew Robert Giles, Nicholas John Dixon
  • Patent number: 8900408
    Abstract: Provided is a process for producing bleached pulp, including subjecting unbleached pulp, which is obtained by cooking a lignocellulose substance, to alkali-oxygen bleaching treatment and then subjecting the alkali-oxygen bleached pulp to chlorine-free bleaching treatment including chlorine dioxide treatment, wherein in at least one chlorine dioxide treatment stage in which the chlorine dioxide treatment is performed, monopersulfuric acid is used in combination. The amount of chlorine dioxide to be used is reduced and the color reversion resistance of the bleached pulp is improved by this process.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: December 2, 2014
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Eiko Kuwabara, Takashi Ishii
  • Patent number: 8864942
    Abstract: A method for producing bleached pulp, including processing unbleached pulp obtained by cooking a lignocellulose substance, followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, including processing unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89%, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: October 21, 2014
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
  • Publication number: 20140284008
    Abstract: A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.
    Type: Application
    Filed: June 2, 2014
    Publication date: September 25, 2014
    Applicant: GP Cellulose GmbH
    Inventors: Arthur J. NONNI, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
  • Publication number: 20140262086
    Abstract: A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.
    Type: Application
    Filed: June 2, 2014
    Publication date: September 18, 2014
    Applicant: GP Cellulose GmbH
    Inventors: Arthur J. NONNI, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
  • Patent number: 8778136
    Abstract: A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: July 15, 2014
    Assignee: GP Cellulose GmbH
    Inventors: Arthur J. Nonni, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
  • Patent number: 8771463
    Abstract: An object of the present invention is to provide a cellulose fiber assembly and a cellulose fiber composite, each having low coloration. The present invention is directed to a method for preparing a fibrillated cellulose fiber assembly, in which the cellulose fiber raw materials are subjected to a fibrillation treatment and a reduction treatment. The present invention provides a method for preparing a cellulose fiber assembly, comprising a fibrillation step of fibrillating cellulose fiber raw materials to obtain fibrillated cellulose fibers, an assembly preparation step of obtaining a cellulose fiber assembly using the fibrillated cellulose fibers, and a step of carrying out a reduction treatment. Further, the present invention provides a cellulose fiber composite comprising the prepared cellulose fiber assembly and a matrix material.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: July 8, 2014
    Assignee: Oji Holdings Corporation
    Inventors: Tomokazu Umemoto, Hideko Akai, Yasutomo Noishiki, Go Banzashi
  • Patent number: 8764936
    Abstract: Method for the production of mechanical or chemi-mechanical pulp as raw material for paper or cardboard. According to this method, the pulp is fibrillated and the fibrillated pulp is bleached in alkaline conditions. According to the present invention, the pulp is screened to separate the reject from the accept, at maximum approximately 60% of the total amount of pulp is separated as the reject, the reject is bleached separate from the accept, and, after that, the bleached reject is remixed with the accept. When operating according to the present invention, the strength of the pulp increases and the energy used for refining is reduced, which is seen both in the refining of the reject and in the post-refining of the final mechanical pulp.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: July 1, 2014
    Assignee: M-real Oyj
    Inventors: Auli Laurila-Lumme, Markku Leskelä, Kristiina Manninen, Ole Nickull, Isto Nikamaa, Marko Pekkola, Maija Pitkänen, Pirita Suortamo, Kai E. J. Vikman
  • Patent number: 8747612
    Abstract: The present invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, adding the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. The invention further relates to a microfibrillated cellulose produced.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: June 10, 2014
    Assignee: Stora Enso OYJ
    Inventors: Isto Heiskanen, Ali Harlin, Kaj Backfolk, Risto Laitinen
  • Publication number: 20140000824
    Abstract: The present invention provides for the optimisation of conditions for treating pulp with a catalyst and hydrogen peroxide to produce a Freeness value (SR) in a web produced from the treated pulp such that the energy required in mechanical agitation of the pulp is reduced.
    Type: Application
    Filed: May 9, 2011
    Publication date: January 2, 2014
    Applicant: CATEXEL LIMITED
    Inventors: Ronald Hage, Kimberly Soraya Yang
  • Publication number: 20140000825
    Abstract: A method for alteration of the morphology of cellulose fibers, particularly softwood fibers, by (a) subjecting the fibers to a metal ion-activated peroxide treatment carried out at a pH of between about 1 and about 9, preferably between 3 and 7, and (b) subjecting the treated fibers to a refining treatment thereby converts SW fibers to HW-like fibers in many respects. The metal ion-activated peroxide treatment has been noted to act on pulp cellulose and hemi-cellulose, causing oxidation and oxidative degradation of cellulose fibers. The chemical treatment of the pulp, taken alone, is not sufficient to attain the desired modification of the morphology of the fibers, however, subsequent refining or like mechanical treatment of the chemically-treated fibers to achieve a given degree of refinement of the fibers requires dramatically less refining energy to achieve a desired end point of refinement and to impart other desirable properties to the pulp.
    Type: Application
    Filed: September 4, 2013
    Publication date: January 2, 2014
    Applicant: INTERNATIONAL PAPER COMPANY
    Inventors: ZHENG TAN, XUAN T. NGUYEN, KAREN MAURER
  • Patent number: 8568558
    Abstract: The delignification and bleaching of chemical pulp by a bleaching stage, in which the chemical pulp is reacted first with chlorine dioxide and, after reaction of the chlorine dioxide, is further reacted without intermediate washing with hydrogen peroxide in the presence of a molybdate or tungstate, permits the production of chemical pulp having a whiteness of at least 89.5%, having improved stability to yellowing and reduced oxidative damage.
    Type: Grant
    Filed: January 16, 2011
    Date of Patent: October 29, 2013
    Assignee: Evonik Degussa GmbH
    Inventor: Thomas Dietz
  • Patent number: 8545673
    Abstract: Process for recovering molybdate or tungstate from an aqueous solution, in which molybdate or tungstate is bound to a water-insoluble, cationized inorganic carrier material from the aqueous solution at a pH in the range from 2 to 6, the laden carrier material is separated off and the bound molybdate or tungstate is liberated once again into aqueous solution at a pH in the range from 6 to 14. The process is suitable for recovering molybdate or tungstate in the delignification of pulp with hydrogen peroxide in the presence of molybdate or tungstate as catalyst. The recovered molybdate or tungstate can be recycled to the delignification.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: October 1, 2013
    Assignee: Evonik Degussa GmbH
    Inventors: Thomas Dietz, Hans Ulrich Süss
  • Publication number: 20130126111
    Abstract: The present invention provides for the optimisation of conditions for treating pulp with a catalyst and hydrogen peroxide to produce a Freeness value (SR) in a web produced from the treated pulp such that the energy required in mechanical agitation of the pulp is reduced.
    Type: Application
    Filed: September 5, 2011
    Publication date: May 23, 2013
    Applicant: CATEXEL LIMITED
    Inventors: Ronald Hage, Kimberly Soraya Yang
  • Publication number: 20130098571
    Abstract: A method for alteration of the morphology of cellulose fibers, particularly softwood fibers, by (a) subjecting the fibers to a metal ion-activated peroxide treatment carried out at a pH of between about 1 and about 9, preferably between 3 and 7, and (b) subjecting the treated fibers to a refining treatment thereby converts SW fibers to HW-like fibers in many respects. The metal ion-activated peroxide treatment has been noted to act on pulp cellulose and hemi-cellulose, causing oxidation and oxidative degradation of cellulose fibers. The chemical treatment of the pulp, taken alone, is not sufficient to attain the desired modification of the morphology of the fibers, however, subsequent refining or like mechanical treatment of the chemically-treated fibers to achieve a given degree of refinement of the fibers requires dramatically less refining energy to achieve a desired end point of refinement and to impart other desirable properties to the pulp.
    Type: Application
    Filed: September 7, 2012
    Publication date: April 25, 2013
    Applicant: International Paper Company
    Inventors: Zheng Tan, Xuan T. Nguyen, Karen L. Maurer
  • Publication number: 20130092336
    Abstract: A method of producing a modified pulp comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amount of hemicellulose contained in the modified Kraft pulp is from about 5 to about 10% by dry weight of the modified pulp.
    Type: Application
    Filed: May 21, 2012
    Publication date: April 18, 2013
    Applicant: INTERNATIONAL PAPER COMPANY
    Inventors: ZHENG TAN, GOPAL GOYAL, ALEXANDER A. KOUKOULAS
  • Publication number: 20120305208
    Abstract: Process for recovering molybdate or tungstate from an aqueous solution, in which molybdate or tungstate is bound to a water-insoluble, cationized inorganic carrier material from the aqueous solution at a pH in the range from 2 to 6, the laden carrier material is separated off and the bound molybdate or tungstate is liberated once again into aqueous solution at a pH in the range from 6 to 14. The process is suitable for recovering molybdate or tungstate in the delignification of pulp with hydrogen peroxide in the presence of molybdate or tungstate as catalyst. The recovered molybdate or tungstate can be recycled to the delignification.
    Type: Application
    Filed: August 14, 2012
    Publication date: December 6, 2012
    Applicant: Evonik Degussa GmbH
    Inventors: Thomas Dietz, Hans Ulrich Süss
  • Patent number: 8317975
    Abstract: An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: November 27, 2012
    Assignee: The Research Foundation of the State University of New York
    Inventors: Thomas E. Amidon, Raymond Francis, Gary M. Scott, Jeremy Bartholomew, Bandaru V. Ramarao, Christopher D. Wood
  • Patent number: 8298373
    Abstract: A process for improving optical properties of high-yield pulp (HYP) for producing paper products with superior brightness. Optical brightening agents (OBAs) can effectively improve the optical properties of high-yield pulp (HYP). The present process involves incorporating the OBAs into the alkaline peroxide bleaching process. By combining peroxide bleaching with an optical brightening agent, one can decrease the bleaching cost to reach the same brightness target. Some key advantages of adding OBA to HYP at the pulp mill over the conventional wet-end addition of OBA include: i) the quenching effect on OBA by the wet-end cationic polymers such as PEI is decreased by fixing OBA on HYP fibers; ii) the negative impact of metal ions in the white water system on the OBA performance is minimized when OBA is pre-adsorbed and fixed on HYP fibers; iii) the photo-yellowing (color reversion) of HYP and HYP-containing paper sheets is decreased when more OBA is on HYP fibers to protect them from harmful UV radiation.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: October 30, 2012
    Assignee: University of New Brunswick
    Inventors: Yonghao Ni, Zhibin He
  • Patent number: 8287691
    Abstract: The disclosure provides a process of modifying a seed based fiber (SBF) to form an enhanced fiber additive (EFA). The process includes an acid treatment step and optionally at least one fiber modification step. Preferred EFA products and uses are described.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: October 16, 2012
    Assignee: Cargill, Incorporated
    Inventors: Jagannadh V. Satyavolu, David E. Garlie, Kevin R. Anderson, John T. McDonald, Paula R. Krogmann
  • Patent number: 8268123
    Abstract: Provided are a method for producing bleached pulp, comprising processing unbleached pulp obtained by cooking a lignocellulose substance, for alkali-oxygen bleaching followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, comprising processing the unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89%, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: September 18, 2012
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
  • Patent number: 8268122
    Abstract: The present invention relates to a process for preparing a high-yield pulp comprising a) treating a lignocellulose containing material chemically by means of an oxidizing system comprising at least one non-enzymatic oxidant substantially free from ozone and chlorine dioxide and an activator at a pH from about 2 to about 6.5; and b) treating the lignocellulose containing material mechanically for a time sufficient to produce a high-yield pulp, wherein the lignocellulose containing material is chemically treated prior to and/or during any mechanical treatment stage, and wherein the lignocellulose containing material is not chemically treated at a pH from about 11.5 to about 14 between stages a) and b).
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: September 18, 2012
    Assignee: Akzo Nobel N.V.
    Inventors: Karin Susanne Maria Walter, Eva Linnea Elisabeth Wackerberg, Magnus Lars Paulsson
  • Patent number: 8262850
    Abstract: A method for alteration of the morphology of cellulose fibers, particularly softwood fibers, by (a) subjecting the fibers to a metal ion-activated peroxide treatment carried out at a pH of between about 1 and about 9, preferably between 3 and 7, and (b) subjecting the treated fibers to a refining treatment thereby converts SW fibers to HW-like fibers in many respects. The metal ion-activated peroxide treatment has been noted to act on pulp cellulose and hemi-cellulose, causing oxidation and oxidative degradation of cellulose fibers. The chemical treatment of the pulp, taken alone, is not sufficient to attain the desired modification of the morphology of the fibers, however, subsequent refining or like mechanical treatment of the chemically-treated fibers to achieve a given degree of refinement of the fibers requires dramatically less refining energy to achieve a desired end point of refinement and to impart other desirable properties to the pulp.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: September 11, 2012
    Assignee: International Paper Company
    Inventors: Zheng Tan, Xuan Nguyen, Karen L. Maurer
  • Patent number: 8257550
    Abstract: Methods for bleaching oxygen delignified and washed pumps having a consistency of between 8 and 20% are disclosed including a first chlorine dioxide bleaching step, washing the bleached pulp, subjecting the washed pulp to an alkaline extraction step to obtain an alkali-containing pulp, adding chlorine dioxide and adjusting the pH in a second chlorine dioxide bleaching step performed directly after the alkaline extraction step without an intermediate washing step, and subjecting the bleached alkali-containing pulp to a peroxide treatment step directly after the second chlorine dioxide bleaching step or with an intermediate washing step prior to the peroxide treatment step.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: September 4, 2012
    Assignee: Metso Paper, Inc.
    Inventors: Mårten Dahl, Sara Eriksson, Solveig Nordén
  • Patent number: 8246778
    Abstract: A method is described controlling enzymatic decomposition of peroxide comprising contacting a composition containing a peroxide decomposing enzyme with an aldehyde functional polymer added in an amount effective to control the enzyme. There also is a method described for bleaching cellulose pulp, such as recycled paper pulp or other pulps, with an aldehyde functional polymer introduced in an amount effective to control peroxide decomposing enzymes present in the pulp being bleached. Paper products containing the aldehyde functional polymer used to control peroxide decomposing enzymes in a bleaching treatment of cellulose pulp are also provided.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: August 21, 2012
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Chen Lu, Janet Woodward
  • Publication number: 20120175073
    Abstract: A modified kraft pulp fiber with unique properties is provided. The modified fiber can be a modified bleached kraft fiber that is almost indistinguishable from its conventional counterpart, except that it has a low degree of polymerization (DP). Methods for making the modified fiber and products made from it are also provided. The method can be a one step acidic, iron catalyzed peroxide treatment process that can be incorporated into a single stage of a multi-stage bleaching process. The products can be chemical cellulose feedstocks, microcrystalline cellulose feedstocks, fluff pulps and products made from them.
    Type: Application
    Filed: May 28, 2010
    Publication date: July 12, 2012
    Applicant: GP Cellulose GMbH
    Inventors: Arthur J. Nonni, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
  • Patent number: 8182650
    Abstract: A method of producing a modified pulp comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amount of hemicellulose contained in the modified Kraft pulp is from about 5 to about 10% by dry weight of the modified pulp.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: May 22, 2012
    Assignee: International Paper Company
    Inventors: Zheng Tan, Gopal Goyal, Alexander A. Koukoulas
  • Publication number: 20120031575
    Abstract: A method of treating lignocellulosic pulp in which an aqueous pulp mixture is treated with a bleaching agent and then subjected to an alkaline extraction at a reduced pH with a combination of alkaline agents comprising caustic soda and soda ash and using caustic soda for pH control.
    Type: Application
    Filed: April 27, 2011
    Publication date: February 9, 2012
    Applicants: SAVAGE SERVICES CORPORATION, FMC WYOMING CORPORATION
    Inventors: Bimal Khandelwal, Adrienne S. Nadeau, John T. Wolanski
  • Publication number: 20120006321
    Abstract: The present invention relates generally to a process for recovering hemicellulose from Arundo donax comprising extracting a hemicellulose containing fraction from an Arundo donax biomass, purifying the hemicellulose containing fraction to remove lignin and other extractives, concentrating the purified hemicellulose containing fraction, and hydrolyzing the concentrated and purified hemicellulose containing fraction to yield 5 and 6 carbon sugars.
    Type: Application
    Filed: March 8, 2011
    Publication date: January 12, 2012
    Applicant: TreeFree Biomass Solutions, Inc.
    Inventor: W. T. McKean
  • Publication number: 20110315331
    Abstract: A process for bleaching mechanical wood pulp is provided comprising subjecting the wood pulp to at least one bleaching stage with one or more bleaching agents in the presence of one or more optical brightening agent, wherein the bleaching agents are selected from the group consisting of oxidative bleaching agents other than chlorine based bleaching agents such as chlorine dioxide, elemental chlorine or a combination thereof, reductive bleaching agents or any combination of two or more thereof.
    Type: Application
    Filed: June 17, 2011
    Publication date: December 29, 2011
    Applicant: INTERNATIONAL PAPER COMPANY
    Inventor: Xuan Truong Nguyen
  • Patent number: 8080129
    Abstract: This invention reports an environmentally benign method of delignifying bleaching sequences to gain more than 80% ISO brightness for alkaline sulfite-anthraquinone (AS/AQ) wheat straw pulp comprising of AOPsYP0, AOPsEP0 and AOPsP0P1 sequences that yielded surprising results in the field of pulp and paper technology; wherein the selectivity of sequences resulted in the protection of ?-cellulose from degradation, produced significant drop in acid soluble lignin and yielded low viscosity losses reducing ecological impact of effluent load.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: December 20, 2011
    Inventors: Naila Yaqoob, Ishtiaq-Ur-Rehman, Kausar Jamal Cheema, Sahibzada Rashad Hameed, Bushra Mateen
  • Patent number: 8066846
    Abstract: The invention relates to a stabilizing composition comprising following components (A) a polymer having the following formula: wherein R1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R2 is —COOM or —CH2COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol, (B) a chelating agent, (C) a poly-alpha-hydroxyacrylic acid or an alkaline salt thereof or the corresponding polylactone thereof, and (D) optionally a polycarboxylic acid polymer or an alkaline salt thereof. The invention also relates to a process for the treatment of a fiber material.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: November 29, 2011
    Assignee: Kemira Oyj
    Inventors: Aarto Parén, Jukka Jäkärä, Jukka Rautiainen, Reijo Aksela, Ilkka Renvall, Anna Ilomäki, Minna Sankari, Anna Sundquist, Heli Virkki, Hannu Hämäläinen
  • Publication number: 20110287275
    Abstract: A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.
    Type: Application
    Filed: August 8, 2011
    Publication date: November 24, 2011
    Applicant: INTERNATIONAL PAPER COMPANY
    Inventors: ZHENG TAN, DAMARIS LORENZONI, GOPAL GOYAL, SEN YANG
  • Patent number: 8048263
    Abstract: A process for applying chemicals, such as an alkaline peroxide pretreatment (1) to lignocellulosic material before chemical refining and at the primary refiner (3). The preferred embodiment comprises (i) preconditioning at temperatures below 95° C., especially below 80° C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80° C., and (iv) subsequent high consistency bleaching (4).
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: November 1, 2011
    Assignee: Andritz Inc.
    Inventors: Martin Herkel, Thomas Pschorn, Eric Chao Xu
  • Patent number: 8048264
    Abstract: The present invention relates to a stabilizing composition comprising following components (A) a polymer having following formula wherein R1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R2 is —COOM or —CH2COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol, (B) a chelating agent, and (C) an alkaline earth metal compound. The invention also relates to a process for the treatment of a fiber material.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: November 1, 2011
    Assignee: Kemira Oyj
    Inventors: Aarto Parén, Jonni Ahlgren, Jukka Jäkärä, Ilkka Renvall, Jukka Rautiainen
  • Patent number: 8007635
    Abstract: A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.
    Type: Grant
    Filed: May 2, 2006
    Date of Patent: August 30, 2011
    Assignee: International Paper Company
    Inventors: Zheng Tan, Damaris Lorenzoni, Gopal Goyal
  • Publication number: 20110203485
    Abstract: Methods for treating lignocellulosic material or pigment with a reductive bleaching solution generally include washing the lignocellulosic material or pigment with a reducing agent of magnesium dithionite. The method includes at least one reductive stage and at least one peroxide stage. Also disclosed are methods for preparing dithionite solution wherein magnesium bisulfite is reduced with borohydride solution to obtain dithionite. Bleached lignocellulosic material or pigment obtained with the treatment methods are also disclosed.
    Type: Application
    Filed: October 30, 2009
    Publication date: August 25, 2011
    Applicant: KEMIRA OYJ
    Inventors: Risto Rahkola, Birgitta Peltopakka, Hannu Hämäläinen, Jonas Konn, Sari Vahlroos-Pirneskoski
  • Patent number: 7988821
    Abstract: The invention relates to a process for the treatment of a fibre material comprising the step of contacting the fibre material in an aqueous medium with a chelating agent and a polymer having following general formula wherein R1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R2 is —COOM or —CH2COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol. The invention also relates to a composition comprising a chelating agent and the above polymer.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: August 2, 2011
    Assignee: Kemira Oyj
    Inventors: Seung-Hoon Lee, Jonni Ahlgren, Jukka Jäkärä, Aarto Parén, Jukka Rautiainen, Ilkka Renvall
  • Publication number: 20110067831
    Abstract: Process for the bleaching of paper pulp in which an aqueous suspension of paper pulp is subjected to a bleaching treatment with hydrogen peroxide in the presence of magnesium hydroxide and of at least one poly-?-hydroxyacrylic acid, its salt or their mixture.
    Type: Application
    Filed: May 25, 2009
    Publication date: March 24, 2011
    Applicant: SOLVAY (SOCIETE ANONYME)
    Inventor: Pierre Dournel
  • Patent number: 7892397
    Abstract: A process for producing dissolving pulp includes a degumming step using a degumming liquor which includes hydrogen peroxide and ammonia.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: February 22, 2011
    Assignee: Alberta Innovates - Technology Futures
    Inventors: Keith Luo, Wade Chute
  • Patent number: 7867357
    Abstract: The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 5. The invention also relates to peroxide bleaching processes.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: January 11, 2011
    Assignee: Kemira Oyj
    Inventors: Jonni Ahlgren, Aarto Parén, Jukka Jäkärä, Timo Härmä, Ilkka Renvall