Gas, Vapor Or Mist Contact Patents (Class 162/63)
  • Patent number: 8968515
    Abstract: A method of alkaline pretreatment of biomass, in particular, pretreating biomass with gaseous ammonia.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: March 3, 2015
    Assignee: Board of Trustees of Michigan State University
    Inventors: Venkatesh Balan, Bruce E. Dale, Shishir Chundawat, Leonardo Sousa
  • Publication number: 20140329280
    Abstract: Biomass (e.g., plant biomass, animal biomass, and municipal waste biomass) is processed to produce useful products, such as fuels. For example, systems can use feedstock materials, such as cellulosic and/or lignocellulosic materials and/or starchy or sugary materials, to produce ethanol and/or butanol, e.g., by fermentation.
    Type: Application
    Filed: March 17, 2014
    Publication date: November 6, 2014
    Applicant: Xyleco, Inc.
    Inventor: Marshall Medoff
  • Publication number: 20140326422
    Abstract: A process for converting a starting material to a purified pulp material, comprising removing lignin from a starting material to form a wet pulp comprising at least 5 wt. % water, extracting hemicellulose from the wet pulp with an extractant, and separating the extracted hemicellulose from the extraction mixture to form a cellulosic product comprising less hemicellulose than the wet pulp. The extractant comprises a cellulose solvent and a co-solvent. The cellulosic product advantageously retains its cellulosic fiber morphology. The process involves separating and recovering hemicellulose and separating and recycling various process streams employed in the process.
    Type: Application
    Filed: May 2, 2014
    Publication date: November 6, 2014
    Applicant: Celanese International Corporation
    Inventors: Denis G. Fallon, Bin Li, Rongfu Li, Jay Mehta, Tianshu Pan, Jaimes Sher, Leslie Allen, Dinesh Arora, Monica Boatwright, Christopher M. Bundren, Michael T. Combs
  • Patent number: 8834633
    Abstract: A method of pre-treating a cellulosic material before hydrolysis is provided. The method comprises the steps of: impregnating the cellulosic material with a reactive water-soluble gas, such as sulphur dioxide (SO2) or carbon dioxide (CO2), in an impregnation chamber to obtain impregnated material; and heating the impregnated material to obtain pre-treated material, wherein the cellulosic material is compressed right before or when it is transferred to the impregnation chamber. A corresponding system is also provided.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: September 16, 2014
    Assignee: Sekab E-Technology AB
    Inventors: Torbjörn Van Der Meulen, Stanley Forss, Lars Elfving, Staffan Magnusson, Magnus Hägglund, Anders Sjöblom
  • Patent number: 8715462
    Abstract: Methods and apparatus are provided for exploiting coated paper products such as coated paper cups. End products include biofuels that have a high energy density. The biofuels may be mixed with coal or other fuels and have good binding characteristics. In some embodiments, useful chemicals such as HMF are produced. The methods involve heat treatment at relatively mild temperatures and pressures under acidic conditions.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: May 6, 2014
    Inventor: Alexis Fosse Mackintosh
  • Patent number: 8657960
    Abstract: Methods and systems for fractionating lignocellulosic biomass including hemicellulose, cellulose and lignin, including exploding the biomass cells to devolatilize the biomass, hydrolyzing the hemicellulose to produce a liquid component including hemicellulosic sugars and a solid component including less than 10% hemicellulose, separating the liquid and solid components, vaporizing the cellulose in the solid component, and condensing the cellulosic sugar vapors. The methods and systems may vaporize the cellulose in a continuous steam reactor at a temperature of about 400-550° C. and a pressure of about 1-3 bara. Electromagnetic and/or electroaccoustic treatment such as ultrasound and/or microwave treatment may be applied to the biomass immediately before or during cellulose hydrolysis.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: February 25, 2014
    Assignee: Nova Pangaea Technologies, Inc.
    Inventor: Peter Herbert North
  • 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
  • Publication number: 20130277000
    Abstract: A process and apparatus for the preparation of a modified lignocellulosic material by treating the lignocellulosic material in a first activator zone having an atmosphere of one or more acid anhydrides in vapour form in a gas at a gauge pressure of 0-50 kPag and a temperature of 100-160° C., and then treating the lignocellulosic material in a second reactor zone having an atmosphere of a gas at a gauge pressure of 0-50 kPag and a temperature of 120-190° C., thereafter stripping the lignocellulosic material with steam or water in a stripper zone, and optionally further processing. The process is more efficient as compared with the prior art processes by providing a better access of the acid anhydrides to the sites of the reactive lignocellulosic hydroxyl groups (—OH), which are located on the internal surfaces of pores and capillary channels in the lignocellulose. Furthermore, the apparatus is relatively simple.
    Type: Application
    Filed: January 10, 2011
    Publication date: October 24, 2013
    Applicant: DANISH PLANT FIBRE TECHNOLOGIES HOLDING A/S
    Inventors: Per Berre Eriksen, Peter Larsen, Esklid Kyhn
  • Patent number: 8444810
    Abstract: A process for treatment of fibers is disclosed. The treatment comprises simultaneously and continuously macerating the fibers and exposing the fibers to superheated steam, ammonia gas and ethylenediamine gas. The treatment is carried out in a chamber where the fibers are subjected to the mechanical rubbing and crushing action of a plurality of rotating pins against channels disposed on the chamber interior wall. The treatment results in improved fiber water holding capacity and improved conversion efficiency in the production of ethanol from the treated fibers.
    Type: Grant
    Filed: November 21, 2010
    Date of Patent: May 21, 2013
    Inventor: Aicardo Roa-Espinosa
  • Patent number: 8394235
    Abstract: A process for the pretreatment of lignocellulosic biomass, in particular during the production of ethanol from biomass. The process including a cooking step where the biomass is exposed to steam at elevated temperatures and pressures for a preselected period of time in a treatment vessel. During the process, volatile and liquid compounds are purged from the treatment vessel.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: March 12, 2013
    Assignee: GreenField Ethanol Inc.
    Inventors: Christopher Bruce Bradt, Richard Romeo Lehoux
  • Publication number: 20120245336
    Abstract: Compositions containing biomass, an ionic liquid, and an amide are described herein. Methods of their preparation and use in extracting and processing biomass are also described herein. Further described herein are films and fibers prepared from the compositions. Methods of recovering the ionic liquids used to process the biomass are also provided.
    Type: Application
    Filed: March 23, 2012
    Publication date: September 27, 2012
    Applicant: BOARD OF TRUSTEES OF THE UNIVERSITY OF ALABAMA
    Inventors: Daniel T. Daly, Robin D. Rogers, Ying Qin
  • Publication number: 20120180962
    Abstract: A process for treatment of fibers is disclosed. The treatment comprises simultaneously and continuously macerating the fibers and exposing the fibers to superheated steam, ammonia gas and ethylenediamine gas. The treatment is carried out in a chamber where the fibers are subjected to the mechanical rubbing and crushing action of a plurality of rotating pins against channels disposed on the chamber interior wall. The treatment results in improved fiber water holding capacity and improved conversion efficiency in the production of biofuels from the treated fibers.
    Type: Application
    Filed: March 24, 2012
    Publication date: July 19, 2012
    Inventor: Aicardo Roa-Espinosa
  • Patent number: 8197639
    Abstract: The system and method reduce the liquid/wood ratio at the top of a vapor phase digester in a continuous digester plant. Chips that are to be cooked in the vapor phase digester are fed as a mixture of chips and liquid at a liquid/wood ratio that exceeds 8:1 in a transfer line to an inverted top separator arranged at the top of the vapor phase digester. The top separator feeds the chips upwardly. More than 50% of the liquid content of the mixture of chips and liquid is withdrawn in the top separator and the remaining liquid is fed out from the top separator to the top of the vapor phase digester. A pile of chips and a liquid volume are established at the top, wherein the pile of chips is disposed above the liquid surface of the liquid volume.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: June 12, 2012
    Assignee: METSO PAPER Sweden AB
    Inventor: Vidar Snekkenes
  • Publication number: 20120125550
    Abstract: A process for treatment of fibers is disclosed. The treatment comprises simultaneously and continuously macerating the fibers and exposing the fibers to superheated steam, ammonia gas and ethylenediamine gas. The treatment is carried out in a chamber where the fibers are subjected to the mechanical rubbing and crushing action of a plurality of rotating pins against channels disposed on the chamber interior wall. The treatment results in improved fiber water holding capacity and improved conversion efficiency in the production of ethanol from the treated fibers.
    Type: Application
    Filed: November 21, 2010
    Publication date: May 24, 2012
    Inventor: Aicardo Roa-Espinosa
  • Patent number: 8176650
    Abstract: A through-air dryer system that diverts the airflow within the through-air dryer during warm up and cool down from the normal airflow during the drying of paper in the papermaking process. During warm up and cool down, a majority of the airflow is supplied to one of the dryer's heads and extracted through the opposite head to reduce thermal stresses. If needed to further reduce thermal stresses, a minority of the airflow is supplied through the dryer's shell.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: May 15, 2012
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Frank S. Hada, Robert J. Seymour, Marek Parszewski
  • Patent number: 8088249
    Abstract: The arrangement and method are for the steam pre-treatment of chips during the production of cellulose pulp to avoid the blow-through of gases in the steam pre-treatment vessel. This prevents foul-smelling gases from being released into the atmosphere. Spreader nozzles for the injection of cooling fluid are arranged in the gas phase of the steam pre-treatment vessel. In the event of the risk for blow-through of steam, cooling that is proportional to the risk is activated. It is possible to avoid the emission of gases from the chip bin when interruptions in the process occur, whereby the release of odors into the surroundings can be minimized.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: January 3, 2012
    Assignee: Metso Paper Sweden AB
    Inventors: Kent-Olof Karlsson, Daniel Trolin
  • Publication number: 20110192559
    Abstract: A method of alkaline pretreatment of biomass, in particular, pretreating biomass with gaseous ammonia.
    Type: Application
    Filed: December 22, 2010
    Publication date: August 11, 2011
    Inventors: Balan Venkatesh, Bruce E. Dale, Shishir Chundawat, Leonardo Sousa
  • Patent number: 7901541
    Abstract: The method is for the impregnation of chips during the manufacture of chemical pulp. The chips are continuously fed without preceding steam treatment to the top of an impregnation vessel that maintains atmospheric pressure. Impregnation fluid (BL) is added to the impregnation vessel and establishes a fluid level (LIQ_LEV). The chips that have been added establish a chips level (CH_LEV) that lies at least 3-5 meters over the fluid level. The temperature at the top of the vessel essentially corresponds to ambient temperature. Impregnation fluid BL is fed in to the impregnation vessel in such an amount and at such a temperature that the temperature that is established at the fluid level (LIQ_LEV) is established within the interval 90-115° C., preferably within the interval 95-105° C.
    Type: Grant
    Filed: July 14, 2005
    Date of Patent: March 8, 2011
    Assignee: Metso Fiber Karlstad AB
    Inventors: Vidar Snekkenes, Lennart Gustavsson, Daniel Trolin, Mats Nasman
  • Publication number: 20100326611
    Abstract: The system and method reduce the liquid/wood ratio at the top of a vapor phase digester in a continuous digester plant. Chips that are to be cooked in the vapor phase digester are fed as a mixture of chips and liquid at a liquid/wood ratio that exceeds 8:1 in a transfer line to an inverted top separator arranged at the top of the vapor phase digester. The top separator feeds the chips upwardly. More than 50% of the liquid content of the mixture of chips and liquid is withdrawn in the top separator and the remaining liquid is fed out from the top separator to the top of the vapor phase digester. A pile of chips and a liquid volume are established at the top, wherein the pile of chips is disposed above the liquid surface of the liquid volume.
    Type: Application
    Filed: February 19, 2008
    Publication date: December 30, 2010
    Inventor: Vidar Snekkenes
  • Patent number: 7758722
    Abstract: The invention relates to a method for producing an absorbent fiber product, starting with a parent fiber product that comprises fibers that, on the one hand, lie at a statistical distance from one another and, on the other hand, make contact with one another at contact points. The method comprises treating the parent fiber product with a fluid medium in such a way that the fibers are at least partially wetted and the fluid medium is then rapidly evaporated by irradiation, so that the evaporation pressure generated by the evaporating fluid medium has a kinematic effect on the fibers, which increases the distance between them. In this way the risk of inadvertent, in particular, thermal damage to the fibers is eliminated. Furthermore, the intrinsic fiber structure is left unaffected, or is only affected in a controlled manner. This prevents the uncontrolled destruction of the fiber structure and a detrimental effect on the fiber product, for example, to its tear resistance when wet.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: July 20, 2010
    Assignee: Saueressig GmbH + Co.
    Inventor: Kilian Saueressig
  • Publication number: 20100032111
    Abstract: A process for producing fibrous material which includes the following: preparing a solution of chemicals that includes less than 25% of sulphite (calculated as Na2SO3), based on the oven-dry amount of the lignocellulosic raw material; mixing the solution of chemicals with wood in a specified liquor material; heating the solution of chemicals and the wood to a temperature above room temperature; and then either of the following alternatives: (1) removing the free-flowing solution of chemicals and digestion of the wood in the vapor phase; (2) having the wood digested in the liquid phase and separating the free-flowing solution of chemicals and the wood.
    Type: Application
    Filed: April 4, 2007
    Publication date: February 11, 2010
    Applicant: VOITH PATENT GmbH
    Inventors: Esa-Matti Aalto, Hans-Ludwig Schubert
  • Publication number: 20100024997
    Abstract: The invention relates to a process for the deresination of pulp as well as to the use of carbon dioxide or a (bi)carbonate compound for the deresination of pulp. The process concerns the removal of wood extractives or resin from an aqueous pulp suspension in an alkaline process stage of the pulping process, such as an oxygen delignification stage, at a pH above 10. Carbonate ions are provided in the pulp at the high pH for solubilizing a significant part of the wood extractives in the pulp. The alkaline pulp is dewatered to remove solubilized extractives and for providing a deresinated pulp.
    Type: Application
    Filed: September 7, 2007
    Publication date: February 4, 2010
    Applicant: LINDE AKTIENGESELLSCHAFT
    Inventor: Anna Tigerstrom
  • Publication number: 20090314443
    Abstract: A method for producing fibrous material from softwood, hardwood, or annual plants, including preparing a solution of chemicals having one of: more than 5% of chemicals for softwood, more than 3.5% of chemicals for hardwood, or more than 2.5% of chemicals for annual plants. The method includes: mixing the solution of chemicals with the lignocellulosic material in a predetermined liquor ratio; heating the solution of chemicals and the lignocellulosic material to a temperature above room temperature; and, after the heating, performing one of: removing a free-flowing portion of the solution of chemicals and digesting the lignocellulosic material in a vapor phase, or digesting the lignocellulosic material in a liquid phase and separating the free-flowing portion of the solution of chemicals and the lignocellulosic material. The produced fibrous material has a lignin content of at least 15% for softwood, at least 12% for hardwood, and at least 10% for annual plants.
    Type: Application
    Filed: April 7, 2007
    Publication date: December 24, 2009
    Inventors: Esa-Matti Aalto, Hans-Ludwig Schubert
  • Publication number: 20090266500
    Abstract: The invention relates to a process for producing a tissue web, which is produced from a stock suspension including fibers. In this case, the volume and the tearing length are to be improved with the lowest possible freeness by the stock suspension containing lignocellolosic fibrous material made of wood or annual plants which has a tearing length of more than 6.5 km at 12°SR or a tearing length of more than 8.0 km at 15°SR and a lignin content of at least 15%, based on the oven-dry fibrous material, for coniferous wood in the unbleached state, or a tearing length of more than 4.5 km at 20°SR and a lignin content of at least 12%, based on the oven-dry fibrous material, for deciduous wood in the unbleached state, or a tearing length of more than 3.5 km at 20°SR and a lignin content of at least 10%, based on the oven-dry fibrous material, for annual plants in the unbleached state.
    Type: Application
    Filed: April 30, 2009
    Publication date: October 29, 2009
    Inventors: Hans-Ludwig Schubert, Frank Peter Meltzer, Esa-Matti Aalto
  • Publication number: 20090236060
    Abstract: A method for the fractionation of lignocellulosic materials into cellulose, hemicelluloses and lignin in a batch or continuous process in a treatment with vaporous mixture of aliphatic alcohol, sulfur dioxide and water. Cooking conditions are varied to get different proportions of cellulose, hemicelluloses and lignin. Chemical recovery through pressure release is described.
    Type: Application
    Filed: March 23, 2009
    Publication date: September 24, 2009
    Inventors: Theodora Retsina, Vesa Pylkkanen, Adriaan van Heiningen
  • Publication number: 20090194243
    Abstract: The present invention is a method for producing a pulp from a fibrous lignocellulose material or source using a treatment or pretreatment step which exposes the material to oxalic acid derivatives, particularly dialkyl ester derivatives, particularly in the vapor phase. Once treated, the material may be refined using any one of the several pulping methods to produce a final pulp product and the production of the product is accompanied by strength increases in paper made from the pulp and energy savings in making the pulp, hi addition the treatment or pretreatment produces a soluble carbohydrate source and other components (e.g. acetic acid, other wood components) for further product development. In certain cases a pulp product is not produced and all of the carbohydrate present in the lignocellulose is converted into soluble sugars.
    Type: Application
    Filed: July 10, 2006
    Publication date: August 6, 2009
    Inventors: Masood Akhtar, William Robert Kenealy, Eric Horn, Ross E. Swaney
  • Publication number: 20090145564
    Abstract: The invention relates to a method for production of wood material articles with low emissions of chemical compounds. The applied wood is treated with bisulphite before bonding. On using formaldehyde resins in the bonding agent, wood material articles can be produced with the inventive method with extremely low formaldehyde emissions and very bright colours.
    Type: Application
    Filed: July 27, 2005
    Publication date: June 11, 2009
    Inventors: Wolfgang Seifert, Erhard Prantz
  • Patent number: 7520958
    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: October 18, 2006
    Date of Patent: April 21, 2009
    Assignee: International Paper Company
    Inventors: Zheng Tan, Gopal Goyal, Alexander A. Koukoulas
  • Publication number: 20080210391
    Abstract: The present invention serves for loading a pulp suspension (S) with calcium carbonate. Liquid calcium hydroxide as milk of lime (7) is added during or before the pulp operation (1) carried out to form the pulp. By introducing gaseous carbon dioxide (8) into the pulp suspension thus treated, a chemical reaction is triggered therein, in which the finely divided calcium carbonate is precipitated. The present invention is particularly economic and effective due to the early addition of calcium oxide or calcium hydroxide.
    Type: Application
    Filed: January 7, 2008
    Publication date: September 4, 2008
    Inventors: Lothar Pfalzer, Klaus Dolle
  • Patent number: 7334347
    Abstract: Dried, singulated cellulose pulp fiber is produced by introducing wet pulp steam and air into a jet dryer. The air is heated to a temperature of 250° C. to 600° C. Steam is injected at a nozzle pressure of from 344 KPa (50 psig) to 4,137 KPa (600 psig). The pulp is removed from the jet dryer and separated from the air. The product formed has advantageous properties such as low fines count, improved kink curl and twist, and high permeability.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: February 26, 2008
    Assignee: Weyerhaeuser Company
    Inventors: Christopher A. Mann, Christopher Q. Tveter
  • Patent number: 7070677
    Abstract: The present invention relates to a method of and apparatus for treating pulp with filler. The method and apparatus according to the invention are especially well suitable for treating pulp with filler, the mixing of which to the pulp requires simultaneous treatment of the pulp with gas. The treatment of cellulose pulp suspension of the paper making industry and calcium hydroxide with carbon dioxide is presented as one preferred embodiment of the invention.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: July 4, 2006
    Assignee: Andritz OY
    Inventor: Kaj Henricson
  • Patent number: 6991705
    Abstract: The invention relates to a process for stabilizing the pH of a pulp suspension with buffering agents and to a process for producing paper from a stabilized pulp suspension. The alkalinity of the pulp suspension is increased by a combination of an alkali metal hydroxide feed and a carbon dioxide feed. Said feeds provide a significant buffering effect which stablilizes the pH of said pulp suspension for the paper making process.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: January 31, 2006
    Assignee: Aga Aktiebolag
    Inventors: Hannu Juhani Leino, Anna Linnea Holmberg
  • Patent number: 6841042
    Abstract: A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in the prior art. Instead of a high pressure transfer device the steamed and slurried chips are pressurized using a single vane slurry pump in series with a centrifugal slurry pump both of which are located at least thirty feet below the top of the treatment vessel and for pressurizing the slurry to a pressure of at least about 10 bar gauge.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: January 11, 2005
    Assignee: Andritz, Inc.
    Inventors: C. Bertil Stromberg, Aaron T. Leavitt, J. Robert Prough
  • Patent number: 6797125
    Abstract: The present invention relates to a method of treating condensates containing compounds, which are more volatile than water, in an evaporation plant, where liquid, such as effluent liquid from a pulp or paper mill is evaporated in multiple effects and where condensates generated in the evaporation are flashed and purified in a steam stripping column. In the method, the condensates from at least two evaporation effects are combined and flashed together, and the vapor obtained from the flashing is made to contact with a condensate stream to be purified in the stripping column, wherefrom the impurities-containing vapor and the purified condensate stream are discharged.
    Type: Grant
    Filed: November 7, 2002
    Date of Patent: September 28, 2004
    Assignee: Andritz Oy
    Inventors: Risto Honkanen, Jan E Öhman
  • Patent number: 6769199
    Abstract: This invention provides a dried singulated cellulose pulp fiber product as well as an apparatus and a method for forming singulated and dried fibers. In accordance with the process a feed pulp is delivered to a jet drier. The jet drier singulates and dries the feed pulp. The singulated and dried fibers are collected from the jet drier. The feed pulp may be treated with a treatment substance. The jet drier may be maintained at negative pressure. The product fibers may have low knot count, a low fines count, as well improved kink, curl and twist. The apparatus for carrying out the process may include a pretreatment station for supplying the treatment substance, a pulp feed device designed for pulp, a pulp feed device designed for pulp and foam suspensions, and/or a fiber separation station having a vacuum conveyor.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: August 3, 2004
    Assignee: Weyerhaeuser Company
    Inventors: Michael David Vrbanac, Ramon Charles Dezutter, Brian Wester, Michael James Yancey
  • Patent number: 6752904
    Abstract: The present invention relates to a process for the removal of lignin from lignocellulose containing material comprising treating the lignocellulose containing material prior to a high-yield pulping process with a delignifying gas comprising gaseous compounds comprising at least one oxygen atom such as chlorine dioxide containing gas.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: June 22, 2004
    Assignee: Akzo Nobel N.V.
    Inventors: Patrick S. Bryant, John C. Sokol, Dwane S. Hutto
  • Publication number: 20040050508
    Abstract: The present invention relates to a method of and apparatus for treating pulp with filler. The method and apparatus according to the invention ae especially well suitable for treating pulp with filler, the mixing of which to the pulp requires simultaneous treatment of the pulp with gas. The treatment of cellulose pulp suspension of the paper making industry and calcium hydroxide with carbon dioxide is presented as one preferred embodiment of the invention.
    Type: Application
    Filed: May 5, 2003
    Publication date: March 18, 2004
    Inventor: Kaj Henricson
  • Patent number: 6679972
    Abstract: A process for the bleaching of lignin present in pulp fibers in an aqueous environment such as a pulp suspension. The invention also relates to a process for producing paper or board from pulp containing bleached lignin. According to the invention carbon dioxide is used for the bleaching of lignin.
    Type: Grant
    Filed: February 15, 2002
    Date of Patent: January 20, 2004
    Assignee: AGA Aktiebolag
    Inventor: Anna Tigerström
  • Patent number: 6623600
    Abstract: In impregnating or extracting treatments of resin-containing wood substrates using a resin-soluble supercritical fluid as delivering or extractive solvent medium problems due to exudation of resin from the wood substrate at pressure release necessary before the termination of the treatment are avoided or reduced by a controlled pulsating pressure release down to atmospheric pressure. Thereby the total process time can be substantially reduced.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: September 23, 2003
    Assignee: Supertrae A/S
    Inventor: Ole Henriksen
  • Publication number: 20030168190
    Abstract: The invention relates to a process for the bleaching of an aqueous lignocellulosic pulp under acidic conditions in the bleaching plant of a pulp mill. The bleached pulp is used for the production of paper or pulp. The selectivity of the bleaching agent towards primary reactions with lignin is enhanced by the use of a carbon dioxide providing medium in the pulp.
    Type: Application
    Filed: March 26, 2003
    Publication date: September 11, 2003
    Inventors: Petri Juhana Jokinen, Jarmo Tapio Kahala, Hannu Sakari Sonni
  • Publication number: 20030155086
    Abstract: The invention relates to improvements in the bleaching of a lignocellulosic pulp by adding carbon dioxide to provide a beneficial pH profile in the chlorine dioxide bleaching or delignification. The resulting bleached pulp is used in the production of paper or pulp. The invention also relates to the use of carbon dioxide for providing a desired pH profile in a chlorine dioxide bleaching stage.
    Type: Application
    Filed: March 3, 2003
    Publication date: August 21, 2003
    Inventors: Krister Sjoblom, Malena Rennel
  • Publication number: 20030150570
    Abstract: The invention relates to a process for stabilizing the pH of a pulp suspension with buffering agents and to a process for producing paper from a stabilized pulp suspension. The alkalinity of the pulp suspension is increased by a combination of an alkali metal hydroxide feed and a carbon dioxide feed. Said feeds provide a significant buffering effect which stablilizes the pH of said pulp suspension for the paper making process.
    Type: Application
    Filed: March 13, 2000
    Publication date: August 14, 2003
    Inventors: HANNU JUHANI LEINO, ANNA LINNEA HOLMBERG
  • Patent number: 6589387
    Abstract: The invention relates to a process for improving the drainage or dewatering of cellulosic pulp suspensions in a paper making machine, a drying machine or the like assembly. The invention also relates to a process for producing a dried cellulosic product from said pulp suspension. The drainage of said pulp suspension is improved by treating it with carbon dioxide just prior to its entering a dewatering device such as the wire section of a paper machine.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: July 8, 2003
    Assignee: AGA Aktiebolag
    Inventors: Hannu Juhani Leino, Anna Linnea Holmberg
  • Patent number: 6572734
    Abstract: A pre-treatment device for wood chips for pulping comprises a tube through which the wood chips fall into a digester. Steam is injected into the tube through rings of nozzles, which are angled circumferentially to impart a rotary and turbulent motion to the falling chips. Some nozzles are angled downwardly to encourage the chips to flow freely through the tube, some are horizontal to encourage a longer dwell time near the nozzles. Digesting liquor is also sprayed onto the chips from spray nozzles after the first ring of steam nozzles. The heat and steam expel air and other non-condensable gases and volatiles from the chips, allowing them to absorb the liquor. At the bottom of the tube, the chips are propelled down and outwards by jets of higher-pressure steam, spreading and packing them into the digester.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: June 3, 2003
    Inventor: Jack T. Baker
  • Patent number: 6569285
    Abstract: The present invention relates to a process for the removal of lignin from lignocellulose containing material comprising treating the lignocellulose containing material prior to a chemical pulping process with a delignifying gas, wherein the gas comprises chlorine dioxide.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: May 27, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Patrick S. Bryant, John C. Sokol
  • Patent number: 6464827
    Abstract: A method for producing pulp, comprising digesting lignocellulosic wood, containing one or more xylan derivatives selected from the group consisting of xylan bound with lignin, xylan bound with hexenuronic acid, and mixtures thereof, with an aqueous alkaline pulping solution containing sulfide and having an initial free hydroxyl ion concentration of at least 1 mole per liter, under conditions whereunder xylan is dissociated from said one or more xylan derivatives and the pH of the solution remains above 12.5; and then while the pH of said solution is above 12.5, adding a sufficient amount of an acidic agent to said pulping solution to precipitate dissociated xylan from said pulping solution while minimizing precipitation of lignin from said pulping solution. Carbon dioxide is a preferred acidic agent.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: October 15, 2002
    Assignee: Praxair Technology, Inc.
    Inventor: Jorge Luiz Colodette
  • Publication number: 20020134519
    Abstract: A method for eliminating detrimental substances in a process liquid. The process liquid has a first pH and, in addition to said detrimental substances, comprises metal ions and suspended material. Carbon dioxide is added to the process liquid in order to bring the process liquid to a second pH, lower than the first pH. Thereby, the metal ions comprise hydroxide builders, wherein the carbon dioxide (CO2) is added in an amount which causes the second pH to be between 8 and 6.5, so that the carbon dioxide primarily forms bicarbonate ions (HCO3−) having a pH-buffering effect and the metal ions primarily form metal hydroxides. Thereafter, the detrimental substances coagulate or agglomerate with the metal hydroxides and are adhered to the suspended material so that they become inactive. The method is advantageously used in connection with pulp and/or paper making processes.
    Type: Application
    Filed: January 9, 2002
    Publication date: September 26, 2002
    Inventors: Anette Karlsson, Liviu Haias
  • Patent number: 6419788
    Abstract: A multi-function process is described for the separation of cellulose fibers from the other constituents of lignocellulosic biomass such as found in trees, grasses, agricultural waste, and waste paper with application in the preparation of feedstocks for use in the manufacture of paper, plastics, ethanol, and other chemicals. This process minimizes waste disposal problems since it uses only steam, water, and oxygen at elevated temperature in the range of 180° C. to 240° C. for 1 to 10 minutes plus a small amount of chemical reagents to maintain pH in the range 8 to 13. An energy recuperation function is important to the economic viability of the process.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: July 16, 2002
    Assignee: PureVision Technology, Inc.
    Inventor: Richard C. Wingerson
  • Publication number: 20020088569
    Abstract: The present invention relates to a process for the removal of lignin from lignocellulose containing material comprising treating the lignocellulose containing material prior to a high-yield pulping process with a delignifying gas comprising gaseous compounds comprising at least one oxygen atom such as chlorine dioxide containing gas.
    Type: Application
    Filed: March 2, 2001
    Publication date: July 11, 2002
    Inventors: Patrick S. Bryant, John C. Sokol, Dwane S. Hutto
  • Publication number: 20020059994
    Abstract: A novel process has been discovered whereby acid is added to the lignocellulosic material (black liquor containing lignin). The acid renders the lignin insoluble thus enabling it to be separated from the lignocellulosic material. This allows the chemical value of various components to be reclaimed. This process enables important environmental and economic benefits to be achieved. The invention obviates the need for a recovery boiler which burns the sugars and the lignin. Additionally, sodium salts are precipitated out of the process. Sodium carbonate from outside sources is used in the novel process. The supply of energy to the separation process is from a source other than the recovery furnace.
    Type: Application
    Filed: October 10, 2001
    Publication date: May 23, 2002
    Inventor: Kenneth R. Kurple