Liquor From Digestion Using Organic Compound Or Including Element Other Than Na, Ca, Mg, O, C, H Or S Patents (Class 162/32)
  • Patent number: 10596720
    Abstract: The present invention relates to a method for producing wood materials from lignocellulose-containing crushed products, in particular for producing wooden insulating panels or OSB boards, wherein in order to decrease or reduce the emission of volatile organic compounds (VOC) and, if relevant, very volatile organic compounds (VVOC), including terpenes, acids and aldehydes, said wood materials are treated with a combination of additives during production. According to the invention, the treatment is carried out with a first component made of porous carbon and a second component, a hydrogen sulphite salt. The invention further relates to wood materials that can be obtained using the method according to the invention, having reduced emissions of VOCs, including terpenes, acids and aldehydes.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: March 24, 2020
    Assignee: SWISS KRONO TEC AG
    Inventors: Norbert Kalwa, Dirk Müller, Gunnar Thielecke
  • Patent number: 8657996
    Abstract: A method is provided for controlling deposit-forming contaminants that comprise pitch or other fiber components which can interfere with the processing of the fibers, reduce paper quality, or both in papermaking systems. The method includes contacting fibers with a lipase and at least one peroxide source-free oxidant, and optionally nonionic surfactant, to liberate the organic contaminants from the fibers. Paper products of the method are also provided.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: February 25, 2014
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Xiangdong Zhou, Percy Jaquess
  • Patent number: 8617354
    Abstract: Provided is a process for manufacturing shaped cellulose materials from lignocellulose where a dissolving grade pulp is manufactured and dissolved in an aqueous alkaline or acidic solvent system forming a solution suitable for shaping new cellulose structures including fibers, films and cellulose derivatives. At least a part of the spent cellulose dissolving or cellulose shaping chemicals are recovered in one or more unit operations in a pulp mill chemical recovery cycle.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: December 31, 2013
    Assignee: Kiram AB
    Inventor: Lars Stigsson
  • Patent number: 7468176
    Abstract: Feeding device for feeding burned lime to a reaction vessel for causticizing soda liquor to caustic soda. The feeding device, in its upper part, has an inlet for receiving slurry of the burned lime and the soda liquor for formation of said slurry inside said feeding device. The system further comprises a tall and slender feed vessel having a lower part having an outlet defined therein for the slurry. The outlet, via a pump, is operatively connected to the reaction vessel. The process and the feeding system utilize the feeding device, in which process the slurry is created of the burned lime and a first part of the soda liquor, a second part being preheated before addition to the slurry, whereafter slaking and causticizing reactions are completed under elevated temperature and pressure.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: December 23, 2008
    Inventors: Lennart Westerberg, George W. Bearry, Patrik Lownertz, Don Parker
  • Patent number: 7097738
    Abstract: The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural. The method is applicable to herbaceous plants, in particular.
    Type: Grant
    Filed: July 11, 2002
    Date of Patent: August 29, 2006
    Assignee: Chempolis Oy
    Inventors: Esa Rousu, Pasi Rousu, Juha Anttila, Päivi Rousu
  • Patent number: 6923888
    Abstract: The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid, such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtained from the bleaching or a stage closely associated with bleaching, whereby organic acids contained in the bleaching liquor are released into the bleaching liquor. The organic acids are then separated from the bleaching liquor and recycled to the cooking stage to be used as cooking chemicals. The nitrogen-, phosphor- and/or sulphur-containing product thereby produced, from which organic acids have been separated, is recovered to be used as a fertilizer or as raw material for a fertilizer.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: August 2, 2005
    Assignee: Chempolis Oy
    Inventors: Pasi Rousu, Päivi Rousu, Esa Rousu, Juha Anttila
  • Publication number: 20040000381
    Abstract: Polynuclear compounds dissolved and contained within an organic solvent are separated from the organic solvent by rendering the organic compounds insoluble within the organic solvent. Accordingly this invention removes polynuclear compounds from a saturated organic solvent. The polynuclear compounds are derived from black liquor obtained from kraft digestion. Whereby polynuclear compounds, substantially free of an organic solvent, are obtained from the organic solvent.
    Type: Application
    Filed: July 1, 2002
    Publication date: January 1, 2004
    Inventor: Gene E. Lightner
  • Patent number: 6663749
    Abstract: A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide is regenerated from sodium carbonate-containing smelts in such pulp processes by autocausticization through the addition of limited amounts of borate. Autocausticization may be carried out at boron to carbonate molar ratios below 2:1 and at sodium to boron molar ratios exceeding 3:1, resulting in high reaction efficiency. Partial autocausticization using borate may also be combined with conventional lime recausticization for the regeneration of sodium hydroxide from sodium carbonate-containing smelts.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: December 16, 2003
    Assignee: U.S. Borax Inc.
    Inventors: Charles M. Bair, Robert B. McBroom, Honghi N. Tran
  • Publication number: 20030145961
    Abstract: The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtained from the bleaching or a stage closely associated with bleaching, whereby organic acids contained in the bleaching liquor are released into the bleaching liquor. The organic acids are then separated from the bleaching liquor and recycled to the cooking stage to be used as cooking chemicals. The nitrogen-, phosphor- and/or sulphur-containing product thereby produced, from which organic acids have been separated, is recovered to be used as a fertilizer or as raw material for a fertilizer.
    Type: Application
    Filed: November 15, 2002
    Publication date: August 7, 2003
    Inventors: Pasi Rousu, Paivi Rousu, Esa Rousu, Juha Anttila
  • Patent number: 6348128
    Abstract: A method is provided for improving causticizing efficiency in the conventional lime recausticization portion of an alkaline pulping process. Such processes are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. The method of this invention comprises reacting an aqueous solution of sodium carbonate with lime to produce sodium hydroxide (causticization) in the presence of borate in order to improve the causticization reaction efficiency. Borate is added in an amount sufficient to provide a boron to sodium (B/Na) molar ratio in the range of between about 0.001:1 and 0.4:1, and preferably in the range of between about 0.01:1 and 0.3:1, which results in an increased causticization efficiency of up to 8% over the reaction efficiency obtained in the absence of borate.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: February 19, 2002
    Assignee: U.S. Borax Inc.
    Inventors: Honghi N. Tran, Charles M. Bair, Robert B. McBroom
  • Patent number: 6024833
    Abstract: Provided is a process for removing metals from a bleaching plant spent liquor and recovering a chelating agent which includes the steps of: heating a spent liquor containing a chelate comprising metals bound in a chelating agent to a temperature of at least about C.
    Type: Grant
    Filed: May 2, 1997
    Date of Patent: February 15, 2000
    Assignee: Kvaerner Pulping Ab
    Inventor: Olle Wennberg
  • Patent number: 5635027
    Abstract: A method of recycling sodium-based salts used for digesting wood in a digester during the manufacture of pulp and paper. The method comprises collecting a black liquor from the digester, concentrating the black liquor, and adding a salt to the black liquor in an amount sufficient to reduce the viscosity thereof. Preferred salts are thiocyanate salts. The black liquor is then oxidized to produce a green liquor and a causticizer added to the green liquor to produce a white liquor containing the sodium-based salts to be recycled. The white liquor is then returned to the digester.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: June 3, 1997
    Assignee: North Carolina State University
    Inventors: Richard J. Spontak, Joanna E. Roberts, Victoria A. Prevysh, Saad A. Khan
  • Patent number: 4778813
    Abstract: Novel capped polymeric quaternary ammonium compositions formed by reacting ionene type polymers with tertiary amines are useful as microbicides, corrosion inhibitors, debonding agents, flocculants, softeners, and demulsifiers.
    Type: Grant
    Filed: January 30, 1985
    Date of Patent: October 18, 1988
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Joseph G. Fenyes, John D. Pera
  • Patent number: 4767500
    Abstract: A sulphite cooking process is described for the production of pulp from materials containing lignocelluloses, with recovery of the cooking chemicals, in which the cooking, the blowing, the washing and the bleaching are performed sucessively. The waste liquor is subjected to several thermal treatments for the recovery of the cooking chemicals. For the cooking of the lignocellulosic materials, alkaline sulphite solutions are used, to which one or, in mixture, several low-boiling solvents are added, as well as at least one compound suitable as a redox catalyst.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: August 30, 1988
    Assignee: Kraftanlagen Aktiengesellschaft
    Inventors: Rudolf Patt, Othar Kordsachia
  • Patent number: 4735683
    Abstract: Described herein is a process for producing potassium salts from potassium-based liquors for pulping of lignocellulosic material. The process comprises the steps of(a) digesting lignocellulosic material with a potassium-base aqueous cooling liquor to obtain an aqueous slurry of partially delignified pulp of the lignocellulosic material;(b) separating the pulp from the spent potassium-base aqueous cooling liquor;(c) concentrating the spent pulping liquor; and(d) recovering potassium salts including potassium carbonate, potassium sulphate and potassium lignosulphonate from the concentrated spent pulping liquor. The recovered potassium salts find numerous uses, an example being use in fertilizers.
    Type: Grant
    Filed: May 28, 1986
    Date of Patent: April 5, 1988
    Assignee: Potash Corporation of Saskatchewan
    Inventors: Alfred Wong, Gary D. Derdall
  • Patent number: 4597830
    Abstract: A pulping liquor for the delignification of lignocellulosic materials is disclosed which avoids the use of sodium hydroxide and so avoids degradation of substantial portions of the cellulose component, and simultaneously avoids the use of sulphide or other environmental pollutants. The cooking process employing this liquor can advantageously include recycling of the liquor to provide sustained delignification from the same original liquor provided, and distillation of spent liquor to recover the essential components thereof.The liquor is comprised of alcohol, an amine and water, each present in amount of 1-12 parts by volume. The liquor is further used in the presence of a quinone and/or azine catalyst.
    Type: Grant
    Filed: June 20, 1983
    Date of Patent: July 1, 1986
    Assignee: The University of Alabama
    Inventors: Gary C. April, Ramkrishna G. Nayak
  • Patent number: 4504356
    Abstract: A continuous process of removing silica from spent pulping liquors (black liquors) which have been obtained by the alkaline digestion of annual plants. The spent liquor is preconcentrated and contacted with a CO.sub.2 -containing gas. The CO.sub.2 -containing gas is supplied at a rate of 30 to 40 m.sup.3 s.t.p. per m.sup.3 of spent liquor. The precipitated silica is removed from the treated liquor. The silica-containing precipitate which has been separated is diluted and washed with water and causticized by an addition of lime or milk of lime. Solid and liquid phases are separated from each other and the resulting residue is combusted.
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: March 12, 1985
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Jurgen Mulder, Pedro Gutmann
  • Patent number: 4486394
    Abstract: The invention relates to an improvement in a method of regenerating alkaline or alkaline earth metal oxides or hydroxides from solution particularly in delignification processes wherein a suitable transition metal such as ferric oxide is burnt with the solution to produce a mixed oxide that is subsequently treated in hot water to regenerate the alkaline or alkaline earth metal oxide or hydroxide and precipitate the transition metal oxide. The improvement controls the presence of fines in the transition metal oxide to maintain these at an acceptable level in the fluidized bed combustion zone. This is achieved by contacting the fines with spent liquor from a delignification process. The invention also provides for the pelletization of the fine material of the transition metal oxide and spent delignification liquor can be used as a binder in the formation of such pellets.
    Type: Grant
    Filed: November 1, 1983
    Date of Patent: December 4, 1984
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Kien L. Nguyen, Andrew J. Keogh, Geoffrey H. Covey
  • Patent number: 4248662
    Abstract: Fibrous material is pre-steamed, impregnated with alkali liquor, refined, and then oxygen pulped at a low consistency (about 3 to 8 percent solids) using an alkali liquor which contains boron compounds. The pulping step of the process is carried out in stages with recycle of liquor to preceding stages after it has been reoxygenated. By recycling a major portion of the pulping liquor, the actual liquor to fibrous material ratio at each stage of the pulping step is maintained at a relatively high level (12/1 to 30/1) while the effective liquor to fibrous material ratio for the overall process is much lower (4/1 to 8/1). This results in a bright pulp of acceptable strength as well as a high solids content spent liquor which is economically recoverable.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: February 3, 1981
    Assignee: The Black Clawson Company
    Inventor: Scott A. Wallick
  • Patent number: 4116759
    Abstract: A method for the regeneration of pulping or bleaching chemicals from spent liquor containing salts of polybasic organic acids. The liquor is evaporated and then burned so that organic matter will be discharged as carbon dioxide and water, and a carbonate residue is formed. Carbon dioxide is expelled from the carbonate with an acid by autocaustization to regenerate the cooking chemicals.
    Type: Grant
    Filed: August 31, 1976
    Date of Patent: September 26, 1978
    Inventor: Jan Janson
  • Patent number: 4070233
    Abstract: A pulping process which includes the steps of oxidizing vegetable materials with an oxidizing chemical selected from the group comprising Cl.sub.2, Cl.sub.2 O,ClO.sub. 2, Mg(ClO).sub.2, Mg(ClO.sub.2).sub.2 Mg.(ClO.sub. 3).sub.2 and mixtures thereof, extracting the oxidized materials with Mg(OH).sub.2 thereby to delignify and bleach the materials and treating the waste liquor from the oxidation, extraction and washing steps by combustion or thermal decomposition thereby to regenerate the chemicals necessary for the oxidation and extraction steps. The process of the invention produces semi-bleached or completely bleached pulp of high strength with high yield while eliminating the problem relating to environmental pollution.
    Type: Grant
    Filed: June 14, 1972
    Date of Patent: January 24, 1978
    Assignee: Japan Pulp & Paper Research Instutute Inc.
    Inventor: Hiroshi Matsuura