Per-compound (e.g., Peroxide, Perborate) Patents (Class 162/78)
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Patent number: 11827543Abstract: A method for continuous supply of peracetate oxidant solution with activity to generate to generate reactive oxygen species includes production processing in a liquid stream starting with a feed water and sequentially adding alkali concentrate, hydrogen peroxide solution and acetyl donor and introducing a resulting peracetate oxidant solution into a product buffer tank from which the peracetate oxidant solution is dispensed for use as a reactive oxygen species-generating oxidant, In the product buffer tank peracetate oxidant solution has a pH in a range of from pH 10 to pH 12, a molar ratio of peracetate anions to peracid in a range of from 60:1 to 6000:1 and a molar ratio of peracetate anions to hydrogen peroxide of greater than 16:1.Type: GrantFiled: December 11, 2020Date of Patent: November 28, 2023Assignee: Clean Chemistry, Inc.Inventor: Wayne E. Buschmann
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Patent number: 10787475Abstract: The present disclosure related to a method of producing a color stable, light colored lignin. The method includes: reacting a lignin composition with a hypochlorite composition having about 5% to about 70% available chlorine; and reacting the hypochlorite treated lignin with hydrogen peroxide at a concentration of about 5% to about 50% to produce the light colored lignin, wherein the lignin composition includes at least one of sulfonated lignin, lignosulfonate, or both.Type: GrantFiled: November 7, 2018Date of Patent: September 29, 2020Assignee: INGEVITY SOUTH CAROLINA, LLCInventors: Bing Wang, Guigui Wan
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Patent number: 10334874Abstract: 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: GrantFiled: April 15, 2016Date of Patent: July 2, 2019Assignees: R. J. Reynolds Tobacco Company, North Carolina State UniversityInventors: Medwick Vaughan Byrd, Jr., Paul Stuart Chapman, Samuel Mark Debusk, Grady Lance Dooly, Anthony Richard Gerardi, David Neil McClanahan
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Patent number: 10006169Abstract: 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: GrantFiled: October 15, 2014Date of Patent: June 26, 2018Assignee: Evonik Degussa GmbHInventors: Thomas Dietz, Bernd Hopf, Ralf Grimmer, Sigrid Wegmann, Verena Illhardt
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Patent number: 9783659Abstract: 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: GrantFiled: July 25, 2014Date of Patent: October 10, 2017Inventor: Chan-oh Park
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Patent number: 9057156Abstract: 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: GrantFiled: December 19, 2011Date of Patent: June 16, 2015Assignee: SKZO NOBEL CHEMICALS INTERNATIONAL B.V.Inventors: Douglas W. Reid, John Atwood, Scott Carmichael, Daniel Connell
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Publication number: 20150119838Abstract: 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: ApplicationFiled: January 6, 2015Publication date: April 30, 2015Inventors: ZHENG TAN, GOPAL GOYAL, ALEXANDER A. KOUKOULAS
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Publication number: 20150101771Abstract: 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: ApplicationFiled: October 20, 2014Publication date: April 16, 2015Inventors: Peter R. MOSS, Doug A. BIPPERT, Rajesh Kumar GARG, Kim W. ROBINSON, Simon GAINEY, Philip G. CRANDALL
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Patent number: 8940133Abstract: 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: GrantFiled: March 6, 2014Date of Patent: January 27, 2015Assignee: The Research Foundation for The State University of New YorkInventors: Thomas E. Amidon, Raymond Francis, Gary M. Scott, Jeremy Bartholomew, Bandaru V. Ramarao, Christopher D. Wood
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Publication number: 20150007953Abstract: 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: ApplicationFiled: June 17, 2014Publication date: January 8, 2015Inventors: ZHENG TAN, DAMARIS LORENZONI, GOPAL GOYAL, SEN YANG
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Publication number: 20140371442Abstract: 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: ApplicationFiled: January 11, 2013Publication date: December 18, 2014Applicant: GP Cellulose GmbHInventors: Arthur J. Nonni, Charles E. Courchene, Phillip R. Campbell, Steven C. Dowdle, Joel Mark Engle
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Patent number: 8906199Abstract: 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: GrantFiled: November 3, 2008Date of Patent: December 9, 2014Assignee: Innospec LimitedInventors: Matthew Robert Giles, Nicholas John Dixon
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Patent number: 8900408Abstract: 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: GrantFiled: December 5, 2008Date of Patent: December 2, 2014Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Eiko Kuwabara, Takashi Ishii
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Patent number: 8864942Abstract: 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: GrantFiled: August 9, 2012Date of Patent: October 21, 2014Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
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Publication number: 20140284008Abstract: 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: ApplicationFiled: June 2, 2014Publication date: September 25, 2014Applicant: GP Cellulose GmbHInventors: Arthur J. NONNI, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
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Publication number: 20140262086Abstract: 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: ApplicationFiled: June 2, 2014Publication date: September 18, 2014Applicant: GP Cellulose GmbHInventors: Arthur J. NONNI, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
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Patent number: 8778136Abstract: 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: GrantFiled: May 28, 2010Date of Patent: July 15, 2014Assignee: GP Cellulose GmbHInventors: Arthur J. Nonni, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
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Patent number: 8771463Abstract: 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: GrantFiled: November 15, 2011Date of Patent: July 8, 2014Assignee: Oji Holdings CorporationInventors: Tomokazu Umemoto, Hideko Akai, Yasutomo Noishiki, Go Banzashi
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Patent number: 8764936Abstract: 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: GrantFiled: May 3, 2006Date of Patent: July 1, 2014Assignee: M-real OyjInventors: Auli Laurila-Lumme, Markku Leskelä, Kristiina Manninen, Ole Nickull, Isto Nikamaa, Marko Pekkola, Maija Pitkänen, Pirita Suortamo, Kai E. J. Vikman
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Patent number: 8747612Abstract: 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: GrantFiled: October 26, 2010Date of Patent: June 10, 2014Assignee: Stora Enso OYJInventors: Isto Heiskanen, Ali Harlin, Kaj Backfolk, Risto Laitinen
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Publication number: 20140000824Abstract: 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: ApplicationFiled: May 9, 2011Publication date: January 2, 2014Applicant: CATEXEL LIMITEDInventors: Ronald Hage, Kimberly Soraya Yang
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Publication number: 20140000825Abstract: 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: ApplicationFiled: September 4, 2013Publication date: January 2, 2014Applicant: INTERNATIONAL PAPER COMPANYInventors: ZHENG TAN, XUAN T. NGUYEN, KAREN MAURER
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Patent number: 8568558Abstract: 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: GrantFiled: January 16, 2011Date of Patent: October 29, 2013Assignee: Evonik Degussa GmbHInventor: Thomas Dietz
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Patent number: 8545673Abstract: 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: GrantFiled: August 14, 2012Date of Patent: October 1, 2013Assignee: Evonik Degussa GmbHInventors: Thomas Dietz, Hans Ulrich Süss
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Publication number: 20130126111Abstract: 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: ApplicationFiled: September 5, 2011Publication date: May 23, 2013Applicant: CATEXEL LIMITEDInventors: Ronald Hage, Kimberly Soraya Yang
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Publication number: 20130098571Abstract: 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: ApplicationFiled: September 7, 2012Publication date: April 25, 2013Applicant: International Paper CompanyInventors: Zheng Tan, Xuan T. Nguyen, Karen L. Maurer
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Publication number: 20130092336Abstract: 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: ApplicationFiled: May 21, 2012Publication date: April 18, 2013Applicant: INTERNATIONAL PAPER COMPANYInventors: ZHENG TAN, GOPAL GOYAL, ALEXANDER A. KOUKOULAS
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Publication number: 20120305208Abstract: 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: ApplicationFiled: August 14, 2012Publication date: December 6, 2012Applicant: Evonik Degussa GmbHInventors: Thomas Dietz, Hans Ulrich Süss
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Patent number: 8317975Abstract: 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: GrantFiled: April 27, 2006Date of Patent: November 27, 2012Assignee: The Research Foundation of the State University of New YorkInventors: Thomas E. Amidon, Raymond Francis, Gary M. Scott, Jeremy Bartholomew, Bandaru V. Ramarao, Christopher D. Wood
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Patent number: 8298373Abstract: 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: GrantFiled: February 9, 2009Date of Patent: October 30, 2012Assignee: University of New BrunswickInventors: Yonghao Ni, Zhibin He
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Patent number: 8287691Abstract: 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: GrantFiled: April 26, 2007Date of Patent: October 16, 2012Assignee: Cargill, IncorporatedInventors: Jagannadh V. Satyavolu, David E. Garlie, Kevin R. Anderson, John T. McDonald, Paula R. Krogmann
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Patent number: 8268122Abstract: 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: GrantFiled: November 29, 2006Date of Patent: September 18, 2012Assignee: Akzo Nobel N.V.Inventors: Karin Susanne Maria Walter, Eva Linnea Elisabeth Wackerberg, Magnus Lars Paulsson
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Patent number: 8268123Abstract: 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: GrantFiled: May 15, 2007Date of Patent: September 18, 2012Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
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Patent number: 8262850Abstract: 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: GrantFiled: September 23, 2003Date of Patent: September 11, 2012Assignee: International Paper CompanyInventors: Zheng Tan, Xuan Nguyen, Karen L. Maurer
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Patent number: 8257550Abstract: 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: GrantFiled: February 12, 2009Date of Patent: September 4, 2012Assignee: Metso Paper, Inc.Inventors: Mårten Dahl, Sara Eriksson, Solveig Nordén
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Patent number: 8246778Abstract: 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: GrantFiled: November 19, 2009Date of Patent: August 21, 2012Assignee: Buckman Laboratories International, Inc.Inventors: Chen Lu, Janet Woodward
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Publication number: 20120175073Abstract: 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: ApplicationFiled: May 28, 2010Publication date: July 12, 2012Applicant: GP Cellulose GMbHInventors: Arthur J. Nonni, Charles E. Courchene, Christopher Michael Slone, Peter R. Abitz
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Patent number: 8182650Abstract: 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: GrantFiled: March 5, 2009Date of Patent: May 22, 2012Assignee: International Paper CompanyInventors: Zheng Tan, Gopal Goyal, Alexander A. Koukoulas
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Publication number: 20120031575Abstract: 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: ApplicationFiled: April 27, 2011Publication date: February 9, 2012Applicants: SAVAGE SERVICES CORPORATION, FMC WYOMING CORPORATIONInventors: Bimal Khandelwal, Adrienne S. Nadeau, John T. Wolanski
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Publication number: 20120006321Abstract: 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: ApplicationFiled: March 8, 2011Publication date: January 12, 2012Applicant: TreeFree Biomass Solutions, Inc.Inventor: W. T. McKean
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Publication number: 20110315331Abstract: 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: ApplicationFiled: June 17, 2011Publication date: December 29, 2011Applicant: INTERNATIONAL PAPER COMPANYInventor: Xuan Truong Nguyen
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Patent number: 8080129Abstract: 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: GrantFiled: November 17, 2009Date of Patent: December 20, 2011Inventors: Naila Yaqoob, Ishtiaq-Ur-Rehman, Kausar Jamal Cheema, Sahibzada Rashad Hameed, Bushra Mateen
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Patent number: 8066846Abstract: 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: GrantFiled: January 31, 2008Date of Patent: November 29, 2011Assignee: Kemira OyjInventors: Aarto Parén, Jukka Jäkärä, Jukka Rautiainen, Reijo Aksela, Ilkka Renvall, Anna Ilomäki, Minna Sankari, Anna Sundquist, Heli Virkki, Hannu Hämäläinen
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Publication number: 20110287275Abstract: 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: ApplicationFiled: August 8, 2011Publication date: November 24, 2011Applicant: INTERNATIONAL PAPER COMPANYInventors: ZHENG TAN, DAMARIS LORENZONI, GOPAL GOYAL, SEN YANG
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Patent number: 8048264Abstract: 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: GrantFiled: May 10, 2005Date of Patent: November 1, 2011Assignee: Kemira OyjInventors: Aarto Parén, Jonni Ahlgren, Jukka Jäkärä, Ilkka Renvall, Jukka Rautiainen
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Patent number: 8048263Abstract: 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: GrantFiled: March 26, 2010Date of Patent: November 1, 2011Assignee: Andritz Inc.Inventors: Martin Herkel, Thomas Pschorn, Eric Chao Xu
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Patent number: 8007635Abstract: 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: GrantFiled: May 2, 2006Date of Patent: August 30, 2011Assignee: International Paper CompanyInventors: Zheng Tan, Damaris Lorenzoni, Gopal Goyal
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Publication number: 20110203485Abstract: 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: ApplicationFiled: October 30, 2009Publication date: August 25, 2011Applicant: KEMIRA OYJInventors: Risto Rahkola, Birgitta Peltopakka, Hannu Hämäläinen, Jonas Konn, Sari Vahlroos-Pirneskoski
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Patent number: 7988821Abstract: 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: GrantFiled: June 13, 2007Date of Patent: August 2, 2011Assignee: Kemira OyjInventors: Seung-Hoon Lee, Jonni Ahlgren, Jukka Jäkärä, Aarto Parén, Jukka Rautiainen, Ilkka Renvall
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Publication number: 20110067831Abstract: 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: ApplicationFiled: May 25, 2009Publication date: March 24, 2011Applicant: SOLVAY (SOCIETE ANONYME)Inventor: Pierre Dournel