With Regeneration, Reclamation, Reuse, Recycling Or Destruction Of Digestion Fluid Patents (Class 162/29)
  • Patent number: 10662092
    Abstract: A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises —obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and —adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: May 26, 2020
    Assignee: Kemira Oyj
    Inventors: Jonni Ahlgren, Sakari Halttunen, Jussi Ruotsalainen, Maria Luhtala, Miia Niemelä
  • Patent number: 10604894
    Abstract: The present invention provides a method of carbonating carbon dioxide with high purity using a paper mill waste sludge by preparing a paper mill waste sludge which is a waste product discharged during the production of papermaking, adding acid to the paper mill waste sludge and reacting the acid therewith to produce a mixed solution and stirring, separating a supernatant of the mixed solution into an eluate, adding a basic substance to the eluate and adjusting pH to precipitate some of the ions in the eluate, and then adding a reaction initiator to the eluate in which some ions are precipitated and removed, and injecting carbon dioxide for a carbonation reaction.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: March 31, 2020
    Assignee: Korea Institute of Geoscience and Mineral Resources
    Inventors: Chi-Wan Jeon, Sang-Won Park, Jun-Hwan Bang, Kyung-Sun Song, Seung-Woo Lee, Hwan-Ju Jo
  • Patent number: 10253265
    Abstract: The present disclosure relates to a process for catalyst assisted production of crude bio-oil from biomass, which involves heating a mixture of biomass slurry and a catalyst at a temperature ranging from 200 to 350° C. and at a pressure ranging from 70 to 250 bars to obtain a mass containing the crude bio-oil. The crude bio-oil is separated from said mass to obtain a separated crude bio-oil. The catalyst being soluble in water is recovered from the aqueous phase and is reused for the preparation of crude bio-oil from biomass.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: April 9, 2019
    Assignee: RELIANCE INDUSTRIES LIMITED
    Inventors: Kshudiram Mantri, Chidambaram Mandan, Ramesh Bhujade, Nagesh Sharma, Raksh Vir Jasra
  • Patent number: 10174131
    Abstract: A process for the production of hemicellulose derived monosaccharides comprising: (a) contacting an aqueous hemicellulosic stream with a C3-8 alkyl alcohol at elevated temperature and acidic pH to produce a reaction mixture comprising at C3-8 alkyl ester and a hemicellulose-derived monosaccharide; and (b) separating the reaction mixture obtained from step (a) into an aqueous phase comprising said hemicellulose-derived monosaccharide and an organic phase comprising said C3-08 alkyl ester. The product of step (b) may be further processed using an optional step: (c) reacting said hemicellulose-derived monosaccharide obtained from step (b) with a metal hydroxide or a quaternary ammonium hydroxide to produce a metal lactate or quaternary ammonium lactate.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: January 8, 2019
    Assignee: Sappi Biotech UK Ltd
    Inventor: Urvish Rameshchandra Pandya
  • Patent number: 10023995
    Abstract: The invention relates to processes for manufacturing pulp and more specifically to improved processes for manufacturing dissolving pulp. The processes have primarily been developed to be used in connection with large scale kraft processes, i.e. they have been designed to be incorporated into a plant. A liquor derivable from the process and comprising xylan, lignin, alkali and water is also disclosed as well as a dissolving pulp produced by the process.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: July 17, 2018
    Assignee: SÖDRA CELL AKTIEBOLAG AB
    Inventors: Johannes Bogren, Jim Parkås, Gabriele Schild, Andrea Borgards
  • Patent number: 9982315
    Abstract: The invention relates to a process for the removal of contaminants from a liquor, the process comprising: introducing a metal or ammonium hydroxide into the liquor; introducing the liquor into a reaction vessel; bubbling a carbon dioxide gas comprising at least 25% carbon dioxide through the liquor within the reaction vessel; and separating the precipitate formed by the carbonatation of the metal hydroxide from the liquor, the precipitate comprising at least some of the contaminants from the liquor; wherein, on average, the liquor is resident within the reaction vessel for a period of no more than about 60 minutes. The invention also relates to a process for the removal of contaminants from a liquor, the process comprising: introducing a metal or ammonium hydroxide into the liquor and bubbling a carbon dioxide gas comprising at least 25% carbon dioxide through the liquor to form a precipitate by carbonatation in a period of no more than about 60 minutes.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: May 29, 2018
    Assignee: T&L SUGARS LIMITED
    Inventors: John Kerr, Anthony Baiada, Robert Jansen, Matthew Shue, Gordon Walker
  • Patent number: 9956510
    Abstract: A filtration system for filtering a liquid includes a drum filter (2) having a primary inlet (4) and a primary outlet (6) in a housing (8), and a rotatable drum screen (10) arranged in the housing. A back flush element (12) is arranged on one side of the drum filter for back flushing filtered particles from the drum screen, and a gutter element (14) is arranged on an opposite side of the drum screen for collecting filtered particles, wherein the gutter element is connected to a secondary outlet (16) in the housing. The filtration system is furthermore provided with a buffer reservoir (18) having a reservoir inlet (20) which is connected to the secondary outlet so as to be closable. The filtration system further includes compression elements (34) for controlling a gas pressure (Pt) in the housing of the drum filter and a gas pressure (Pr) in the buffer reservoir.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: May 1, 2018
    Assignee: BASTENHOF CONSULTANCY B.V.
    Inventor: Dirk Bastenhof
  • Patent number: 9765478
    Abstract: The present invention relates to a method for treating a lignocellulose biomass in order to dissolve the lignin therein, while the cellulose does not dissolve. The cellulose pulp obtained can be used to produce glucose. In addition the lignin can be isolated for subsequent use in the renewable chemical industry as a source for aromatic platform chemicals.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: September 19, 2017
    Assignee: Imperial Innovations Ltd
    Inventors: Agnieszka Brandt, Richard J. Murphy, David J. Leak, Tom Welton, Jason Hallett
  • Patent number: 9555182
    Abstract: A system and method for removing gas bubbles from blood during circulatory assist procedures. An active filter apparatus forces the bubbles to the center of the system where they are removed from the blood before the blood exits the filter.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: January 31, 2017
    Assignee: Indian Wells Medical, Inc.
    Inventors: David W. Wieting, Jay A. Lenker
  • Patent number: 9469695
    Abstract: The present invention relates to a process for producing microcellulose comprising hydrolyzing fibrous cellulosic material with an acid at an elevated temperature or acidifying fibrous cellulosic material followed by washing and hydrolyzing the washed cellulosic material at an elevated temperature to produce a microcellulose-hydrolysate mixture followed by separation of the microcellulose from the hydrolysate, wherein the mixture or separated hydrolysate or microcellulose is optionally neutralized, and wherein the microcellulose production is integrated to production of a pulp mill such that at least part of chemicals used in the acidification, acid hydrolysis and/or neutralization is produced by an integrated chemical recovery process of the pulp mill.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: October 18, 2016
    Assignee: AALTO UNIVERSITY FOUNDATION
    Inventors: Olli Dahl, Kari Vanhatalo, Kari Parviainen
  • Patent number: 9359236
    Abstract: Systems and methods for treating wastewater including a dissolved air flotation operation performed upon a portion of a mixed liquor output from a contact tank prior to the mixed liquor entering a biological treatment tank.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: June 7, 2016
    Assignee: Evoqua Water Technologies LLC
    Inventors: Argun O. Erdogan, Michael L. Doyle
  • Patent number: 9228243
    Abstract: A system and method for hardwood pulp liquid hydrolysate conditioning is provided. The system includes a first evaporator, a hydrolysis unit, at least one lignin separation device, a neutralization device, a precipitate removal device, a solvent extraction unit, a lignin removal and recovery unit, an acid and furfural separation and conditioning unit, and an electrodialysis device, which process a quantity of hardwood mix to produce a desalinated solution containing sugar.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: January 5, 2016
    Assignees: Red Shield Acquistion, LLC, University of Maine System of Board of Trustees
    Inventors: Darrell M. Waite, Richard Arnold, James St. Pierre, Hemant P. Pendse, William H. Ceckler, Amy Elizabeth Luce, Rino P. Dumont
  • Patent number: 9139445
    Abstract: A method for co-producing alumina and activated calcium silicate from high-alumina fly ash, comprising the steps that: high-alumina fly ash reacts with sodium hydroxide solution to obtain desiliconized solution and desiliconized fly ash; milk of lime is added to the desiliconized solution to obtain activated calcium silicate; limestone and sodium carbonate solution are added to the desiliconized fly ash to blend raw slurry, the raw slurry is baked into clinker, and sodium aluminate crude solution is obtained from dissolution of the clinker; the sodium aluminate crude solution is subjected to the processes of first-stage deep desiliconization, second-stage deep desiliconization, carbonization decomposition, seed precipitation and etc to obtain alumina.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: September 22, 2015
    Assignee: INNER MONGOLIA DATANG INTERNATIONAL RECYCLING RESOURCE DEVELOPMENT CO., LTD.
    Inventors: Junmin Sun, Zhanjun Zhang, Gang Chen, Shaoyong Yan, Qizhi Huo, Licheng Wu, Hongli Xu, Lian Qin, Xiaoxia Chen
  • Patent number: 9109329
    Abstract: A lignin plastics solids mass containing lignin solids and liquids with up to 85% liquids can be partially dewatered by heating the lignin plastics solids mass to above a critical temperature at which time the lignin plastics solids agglomerate into lower moisture granular solids with between about 45% to 55% liquids releasing excess liquid which can be easily removed from the solids. The process is particularly useful for lignin plastics solids removed from black liquor from paper mills, or for similar lignin plastics solids masses, which can contain up to 85% liquids and which need to be dried to form useful lignin solids, which can be used for example for fuel. The dewatering process can be combined with the process for separating the lignin from the black liquor to separate the dewatered lignin directly from the black liquor.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: August 18, 2015
    Inventor: Harrison R. Cooper
  • Patent number: 9084975
    Abstract: Disclosed herein are processes, apparatuses, and systems for monitoring and/or controlling caustic concentrations in caustic scrubbers. In various aspects, the processes, apparatuses, and systems comprise a real-time online method for measuring the concentration of caustic in process scrubbers wherein a probe is coupled to a spectrometer; collecting absorption data with wavelength range from about 1000 to about 2000 nm. In a further aspect, this technique tracks the use and recharge of caustic in process scrubbers. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: July 21, 2015
    Assignee: SABIC Global Technologies B.V.
    Inventors: Derek Lake, Yusuf Sulub, Zhensheng Ding
  • Patent number: 8992729
    Abstract: A method and assembly for separating contaminants from liquids, such as condensates, or vapors at an evaporation plant. The contaminants are separated from liquids by stripping when bringing a contaminant-enriched liquid into direct contact with a vapor by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus reducing the contaminant-content of the sprayed liquid and producing a cleaner liquid. The contaminants are enriched in the vapor. From vapors contaminants are separated by absorption when bringing a contaminant-enriched vapor into direct contact with a cleaner liquid by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus increasing the contaminant-content of the liquid, but producing a cleaned vapor.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: March 31, 2015
    Assignee: Andritz Oy
    Inventors: Carl-Gustav Berg, Heikki Jaakkola
  • 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: 20140352900
    Abstract: A flash tank including: an interior chamber having a interior surface formed by a sidewall of the flash tank; a vapor exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an insert inlet tube having an insert outlet and inserted into an inlet port of the chamber, wherein the insert inlet tube extends inward of the sidewall and the insert outlet has an elongated cross-sectional shape oriented substantially parallel to a center vertical axis of the flash tank and substantially perpendicular to a radial line of the flash tank, such that the insert outlet is substantially tangential to the sidewall.
    Type: Application
    Filed: May 8, 2014
    Publication date: December 4, 2014
    Applicant: Andritz Inc.
    Inventors: Richard M. Grogan, Walter Edward Nellis, Tyson Bradford Hunt
  • Patent number: 8888955
    Abstract: The method and equipment are for the evaporation of hot black liquor obtained from a digestion process during the production of cellulose pulp. The black liquor is led to a multistage evaporation line with at least five evaporation stages. The black liquor that is to undergo evaporation in the evaporation line is cooled in at least one heat exchange process in a heat exchanger (HE1) against the partially evaporated black liquor that has undergone evaporation in at least one stage (I). The black liquor that is to undergo evaporation is cooled and the partially evaporated black liquor is heated by at least 5-10° C. The risk for the formation of foam and the separation of methanol are reduced. The greater part of the evaporation takes place at low temperature and at the lowest level of dry matter content in the liquor, which also suppresses encrustation in the stage.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: November 18, 2014
    Assignee: Valmet Power AB
    Inventor: Lars Olausson
  • Publication number: 20140326421
    Abstract: A process for treating a cellulosic material comprising extracting the cellulosic material with an extractant to selectively extract hemicellulose therefrom and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulosic material. The extractant comprises a cellulose solvent and a co-solvent. The cellulosic product advantageously retains its cellulosic fiber morphology. The processes involve separating and recovering the 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, Thomas S. Garrett, Lawton Kizer, Bin Li, Rongfu Li, Jay Mehta, Tianshu Pan, Xiaoyan Tu, Leslie Allen, Dinesh Arora, Prabuddha Bansal, Michael T. Combs
  • Patent number: 8864941
    Abstract: A method for the production water insoluble reactive lignin having low sulfur content and lignosulfonates from lignocellulosic material in a batch or continuous process. Lignocellulosic material is fractionated to produce water insoluble native lignin and lignosulfonates in various ratios, while preserving the cellulose and hydrolyzed hemicelluloses using water, ethanol and sulfur dioxide.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: October 21, 2014
    Assignee: API Intellectual Property Holdings, LLC
    Inventors: Thoedora Retsina, Vesa Pylkkanen
  • Patent number: 8821686
    Abstract: The invention relates to a method and equipment for treatment of black liquor at a pulp mill in order to recover chemicals and energy contained therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor (4), the formed gaseous components are forwarded for utilization and the solids are mixed with water, whereby the formed solids are returned to a lime burning kiln (1) and the sodium-hydroxide-containing liquid is returned to the pulp cooking process.
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: September 2, 2014
    Assignee: Valmet Power Oy
    Inventors: Jani Lehto, Kari Kuukkanen, Timo Honkola
  • Patent number: 8815053
    Abstract: A method of treating and utilizing liquid flows at a chemical pulp mill including stages for: a) chemical pulp is produced in an alkaline cooking process, b) the brown stock generated in the cooking is treated, said treatment comprising washing of the stock and preferably oxygen delignification and subsequent washing of the stock, c) a bleaching process for the brown stock, the bleaching sequence comprising at least one stage using chlorine dioxide and additionally at least one oxidizing bleaching stage and having at least two washing stages for treating the stock with liquids and for producing filtrates, and d) filtrates from stage c) are purified at an effluent treatment plant of the chemical pulp mill, which comprises at least biological treatment, for obtaining purified effluent. The method further includes a stage e), where the purified effluent with a color of 200 mg/l (Pt color) or more and a COD value of over 150 mg/l is used as pulp treatment liquid in stage c).
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: August 26, 2014
    Assignee: Adritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Patent number: 8778135
    Abstract: A circular utilization method in pulping and papermaking processes with straw Primary pulp is obtained by digesting straw raw material according to the ammonium sulfite method. Concentrated black liquor is extruded from the primary pulp; paper pulp and diluted black liquor. The concentrated black liquor and the diluted black liquor are mixed, and a contaminated condensate is obtained. A residual concentrate or the concentrated black liquor is used for preparing a fertilizer. The contaminated condensate is mixed with one or more of the waste material obtained from stock preparation, a crop byproduct or organic waste, and substrate or fertilizer is obtained by fermenting the nitrogen source of the contaminated condensate or ammonium sulfite, or using the contaminated condensate for desulfurizing flue gas. Ammonia and flue gas are reacted to obtain the ammonium sulfite as a digestion agent; and water from recycling is used in corresponding phases of the pulping process.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: July 15, 2014
    Assignee: Shandong Tralin Paper Co., Ltd.
    Inventors: Hongfa Li, Mingxin Song, Songtao Chen, Jihui Yang, Liangjin Guo
  • Patent number: 8709204
    Abstract: A wood pulping process includes producing weak black liquor and cooling the liquor as well as recovering heat therefrom by directing the weak black liquor through a spray film evaporator. A feed or condensate is directed into the spray film evaporator and the feed or condensate is sprayed onto the outer surfaces of a bundle of tubes. This results in the feed or the condensate being vaporized and producing a vapor that can be utilized as a heat source for other processes in a pulp mill.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 29, 2014
    Assignee: Veolia Water Solutions & Technologies North America Inc.
    Inventor: Michael S. Begley
  • Patent number: 8691049
    Abstract: The method is for the production of cellulose pulp in a continuous digester system. Chips are impregnated in an impregnation vessel. The chips are then fed to a subsequent digester vessel in a transfer fluid. A black liquor withdrawal is taken from the digester, which withdrawal is led to the bottom to heat the chips before the chips are fed out from the impregnation vessel. A transfer fluid is withdrawn from the digester and led to the impregnation vessel to act as an impregnation fluid. At least a portion of the transfer fluid that was withdrawn from the top of the digester passes an indirect heat exchanger, in which the transfer fluid withdrawn from the top of the digester at a temperature of at least 125° C. exchanges heat indirectly with a first fluid for the production of steam from the first fluid.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: April 8, 2014
    Assignee: Valmet AB
    Inventor: Vidar Snekkenes
  • Patent number: 8685205
    Abstract: A flash tank for concentrating fluids including a wall defining a rounded interior chamber bounded by a top elliptical head opposite to a bottom elliptical head; an inlet nozzle of the chamber; a steam chamber operatively engaged to the top elliptical head, wherein the steam chamber includes baffles and a conduit that directs condensate from the steam chamber to the level of liquid condensate; a gas discharge port operatively engaged to the steam chamber; and a liquid discharge port engaged to the bottom elliptical head below a vortex breaker. Changes to the flow passage of the steam chamber have been made by extending the baffles further into the internal chambers of the steam chamber.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: April 1, 2014
    Assignee: Andritz Inc.
    Inventors: Walter Edward Nellis, Tyson Bradford Hunt, Richard M. Grogan
  • Publication number: 20140034253
    Abstract: The process for treating a ligno-cellulosic biomass feed stream comprised of solids, C5's, C6's, lignin, and water comprises the steps of: pretreating the ligno-cellulosic biomass feed stream by contacting the ligno-cellulosic biomass with water in the temperature range of 40 to 210 ° C. to create a pre-treated ligno-celluosic biomass comprised of a pre-treatment ligno-cellulosic biomass liquid comprised of suspended solids, C5's, C6's, and acetic acid, wherein the ratio of the C6's to C5's is less than 0.8 to 1.
    Type: Application
    Filed: May 17, 2012
    Publication date: February 6, 2014
    Applicant: Beta Renewables S.p.A.
    Inventors: Simone Ferrero, Paolo Corbellani
  • Patent number: 8632656
    Abstract: A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, brown stock treatment with essentially closed liquid cycles, a pulp bleaching plant using ECF-bleaching, a chemical recovery plant comprising a chemical recovery boiler, and effluent purification. Chloride-containing bleaching plant effluents are led to the effluent purification, where they are treated in order to decrease the organic matter content thereof. At least 20% of the purified effluent is returned to a pulp mill process and purified effluent is used in a last washing stage included in brown stock treatment. In the brown stock treatment the liquid flow is passed counter-currently to evaporation, wherefrom it is led for treatment to a recovery boiler process, wherein a separation process for chlorides is arranged for controlling the chloride level of the liquor cycle.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: January 21, 2014
    Assignee: Andritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Patent number: 8632655
    Abstract: A method in connection with washing of pulp at a chemical pulp mill including at least an alkaline cooking process utilizing cooking liquor for producing pulp, brown stock treatment with essentially closed liquid cycles, in which the last washing device is a washing device based on pressing of pulp, a press or a washing press, a pulp bleaching plant using ECF-bleaching, wherein chloride-containing effluents are formed, a chemical recovery plant and effluent purification. The liquid flows generated at a chemical pulp mill are efficiently circulated without disturbing the main process and minimizing the emissions from the mill. Purified effluent in the amount of at least 1 m3/adt pulp is introduced into the dilution after the press or washing press, whereby the effluent is passed from the dilution into the first process stage of the bleaching.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: January 21, 2014
    Assignee: Andritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Patent number: 8632657
    Abstract: A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, treatment of brown stock generated in the cooking, a bleaching plant using ECF-bleaching, in which chloride-containing effluents are formed, an effluent purification plant for treating bleaching plant effluents and other effluents generated at the mill. At least a portion of the effluents is returned after the purification to the pulp production line as source of process water. More than one treatment line is arranged at the effluent purification plant for the mill effluents and effluents with different chemical compositions are purified in separate treatment lines so that the quality and amount of purified water from each treatment line is suitable for use in a stage or stages of the production process, whereto purified effluent is returned.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: January 21, 2014
    Assignee: Andritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • 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: 20130340960
    Abstract: A method and assembly for separating contaminants from liquids, such as condensates, or vapors at an evaporation plant. The contaminants are separated from liquids by stripping when bringing a contaminant-enriched liquid into direct contact with a vapor by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus reducing the contaminant-content of the sprayed liquid and producing a cleaner liquid. The contaminants are enriched in the vapor. From vapors contaminants are separated by absorption when bringing a contaminant-enriched vapor into direct contact with a cleaner liquid by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus increasing the contaminant-content of the liquid, but producing a cleaned vapor.
    Type: Application
    Filed: October 17, 2011
    Publication date: December 26, 2013
    Applicant: ANDRITZ OY
    Inventors: Carl-Gustav Berg, Heikki Jaakkola
  • Patent number: 8585863
    Abstract: A method for the production water insoluble reactive lignin having low sulfur content and lignosulfonates from lignocellulosic material in a batch or continuous process. Lignocellulosic material is fractionated to produce water insoluble native lignin and lignosulfonates in various ratios, while preserving the cellulose and hydrolyzed hemicelluloses using water, ethanol and sulfur dioxide.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: November 19, 2013
    Assignee: API Intellectual Property Holdings, LLC
    Inventors: Theodora Retsina, Vesa Pylkkanen
  • Patent number: 8535480
    Abstract: A method for pulp processing includes a cold caustic extraction stage in which the spent cold caustic solution and the spent liquid used to wash the extracted pulp are concentrated by an evaporation system. The concentrated liquid can be used as part of the neutralization and cooking liquor in the pulp process, leading to increased efficiency without significant reduction in pulp quality. Highly concentrated filtrate from the cold caustic extraction stage may help reduce hemicellulose deposition on wood fiber during the cooking step.
    Type: Grant
    Filed: May 27, 2010
    Date of Patent: September 17, 2013
    Assignee: Bahia Specialty Cellulose SA
    Inventor: Marcelo Moreira Leite
  • Publication number: 20130206346
    Abstract: A flash tank including: a closed interior chamber; a gas exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an inlet nozzle attached to an inlet port of the chamber, wherein the inlet nozzle includes a flow passage, and a movable valve plate in the flow passage, wherein the valve plate has a first position which defines a first throat in the flow passage and a second position which defines a second throat having a smaller cross-sectional area than the first throat.
    Type: Application
    Filed: January 23, 2013
    Publication date: August 15, 2013
    Applicant: ANDRITZ INC.
    Inventor: Andritz Inc.
  • Patent number: 8500954
    Abstract: The invention relates to a method and apparatus for processing the black liquor of a pulp mill to recover the chemicals and energy therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor (6), formed gaseous components are lead for utilization, sand is returned to a fluidized-bed boiler, and solid matter is mixed with water, whereby a soda-water solution is returned to the pulping process and solid carbon to the fluidized-bed boiler (1).
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: August 6, 2013
    Assignee: Metso Power OY
    Inventors: Jani Lehto, Kari Kuukkanen, Erkki Välimäki
  • Patent number: 8486228
    Abstract: Provided is a lignocellulosic biomass saccharification pre-treatment device capable of producing a pretreated material for saccharification. The lignocellulosic biomass saccharification pre-treatment device comprises a separation unit 4 which separates ammonia gas by heating a pretreated material for saccharification obtained from a substrate mixture obtained by mixing lignocellulosic biomass and ammonia water; a first heat recovery unit 25 which recovers heat-of-dissolution generated when ammonia gas is dissolved in water, and the heat supply units 8, 9, 10 which generate heat by using heat-of-dissolution recovered by the frst heat recovery unit 25 and supply the heat to the separation unit 4.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: July 16, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Tsuyoshi Baba, Junji Yasuda
  • Patent number: 8317975
    Abstract: An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: November 27, 2012
    Assignee: The Research Foundation of the State University of New York
    Inventors: Thomas E. Amidon, Raymond Francis, Gary M. Scott, Jeremy Bartholomew, Bandaru V. Ramarao, Christopher D. Wood
  • Patent number: 8313716
    Abstract: A spinning fluids reactor, includes a reactor body (24) having a circular cross-section and a fluid contactor screen (26) within the reactor body (24). The fluid contactor screen (26) having a plurality of apertures and a circular cross-section concentric with the reactor body (24) for a length thus forming an inner volume (28) bound by the fluid contactor screen (26) and an outer volume (30) bound by the reactor body (24) and the fluid contactor screen (26). A primary inlet (20) can be operatively connected to the reactor body (24) and can be configured to produce flow-through first spinning flow of a first fluid within the inner volume (28). A secondary inlet (22) can similarly be operatively connected to the reactor body (24) and can be configured to produce a second flow of a second fluid within the outer volume (30) which is optionally spinning.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: November 20, 2012
    Assignee: University Of Utah Research Foundation
    Inventors: Jan D. Miller, Jan Hupka, Robert Aranowski
  • Patent number: 8303767
    Abstract: Methods of pretreating comminuted cellulosic material with an acidic solution and then a carbonate-containing solution to produce a pretreated cellulosic material are provided. The pretreated material may then be further treated in a pulping process, for example, a soda-anthraquinone pulping process, to produce a cellulose pulp. The pretreatment solutions may be extracted from the pretreated cellulose material and selectively re-used, for example, with acid or alkali addition, for the pretreatment solutions. The resulting cellulose pulp is characterized by having reduced lignin content and increased yield compared to prior art treatment processes.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: November 6, 2012
    Assignee: The Research Foundation of State University of New York
    Inventor: Raymond Francis
  • Patent number: 8303772
    Abstract: Provided is an unbleached paper product made from grass type pulp, the unbleached paper product has a brightness of 35-60% ISO, the grass type pulp is unbleached. The unbleached paper product includes an unbleached toilet paper, an unbleached hand towel, an unbleached wiping paper, an unbleached duplicating paper, an unbleached meal container, an unbleached food wrapping paper and an unbleached printing paper. The paper products have a high intensity and have no detection of dioxin and absorbable organic halides in the harmful substance detection test.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: November 6, 2012
    Assignee: Shangdong Fuyin Paper & Environmental Protection Technology Co., Ltd.
    Inventors: Hongfa Li, Mingxin Song, Jihui Yang, Yanjin Bi, Jinxiang Xu
  • Patent number: 8273212
    Abstract: The method increases the yield and improves the beatability of kraft pulp. During the progression of the cooking process, more than one cooking liquor with a dissolved content of hemicellulose is drawn off and then reintroduced to the last phases of the cooking process, to re-precipitate the hemicellulose on the fibers. The hemicellulose rich cooking liquors are adjusted so that they, upon being added to the last phase of the cooking process are optimized. Early dissolved hemicellulose has a longer chain length than the hemicellulose that dissolves in the cooking liquor in the later phases of the cooking process, and they also have different tendencies to precipitate on the wood chips softened in the cooking process.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: September 25, 2012
    Assignee: Metso Paper Sweden AB
    Inventor: Vidar Snekkenes
  • Patent number: 8252141
    Abstract: Disclosed herein is a method for recovering a low sodium content lignin from spent kraft cooking liquor without the use a of strong mineral acid for acidulation.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: August 28, 2012
    Assignee: Andritz Oy
    Inventors: Lars Stigsson, Curt Lindstrom
  • Patent number: 8246779
    Abstract: Methods and apparatus for maintaining sulfur concentration in the chemical recovery cycle of a Kraft pulping process. A portion of the recovery boiler ash is dissolved, treated to remove solids, and combined with an acid to provide a solution. The recovery boiler ash may be dissolved directly in the acid. The acid may be effluent from a chlorine dioxide generator. The resulting solution is maintained in a fully dissolved state and subjected to an acid separation step to provide a sodium sulfate enriched phase, which may be used to maintain sulfur concentration in the Kraft pulping process, and a sulfuric acid phase. Chlorine ions can be separated with the sulfuric acid phase. The sulfuric acid phase can be recycled to the chlorine dioxide generator.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: August 21, 2012
    Assignee: NORAM Engineering and Constructors Ltd.
    Inventors: Jonathan Edward Foan, James Theodore Wearing
  • Publication number: 20120168102
    Abstract: A method for producing pulp by extracting hemicellulosic materials from lignocellulosic materials using water in an extraction stage, wherein the extraction stage is either a single extraction or a double extraction process; treating the lignocellulosic materials with an oxidizing agent in a treatment stage, wherein the treatment stage is selected from the group consisting of a second extraction process, an agent impregnation process, and a first pretreatment process; treating the lignocellulosic materials with a reducing agent in the treatment stage, wherein the treatment stage is selected from the group consisting of the second extraction process, the agent impregnation process, and a second pretreatment process; and then subjecting the lignocellulosic materials to a modified Kraft pulping process to produce pulp.
    Type: Application
    Filed: April 2, 2010
    Publication date: July 5, 2012
    Inventors: Sung-Hoon Yoon, Harry T. Cullinan, Gopal A. Krishnagopalan
  • Publication number: 20120135485
    Abstract: The invention pertains to, for example, an improved sorbent and process for removing fermentation inhibitors such as furfural and/or HMF in microbial processes utilizing fermentable sugars obtained from biomass including, for example, in the production of bioalcohols. The sorbent is capable of separating one or more inhibitors from monosaccharides and is characterized by: (1) a Ksugar partition coefficient of less than about 5 and (2) one or more of the following characteristics: (a) a furfural sorption capacity of at least about 200 mg/g sorbent at a furfural solution concentration of 2.5 grams per liter of water; (b) an Mt/M? of at least about 0.9 at 7.5 sec1/2; and (c) a Kfurfural partition coefficient of greater than about 3000.
    Type: Application
    Filed: November 29, 2010
    Publication date: May 31, 2012
    Applicant: Georgia Tech Research Corporation
    Inventors: William J. Koros, Kuang Zhang
  • Publication number: 20120073772
    Abstract: Method for recovering chemicals and energy from sulphite thick liquor containing organic and inorganic compounds obtained when producing pulp by chemical delignification of fibrous raw material using a sulphite pulping process, the method including processing of the organic and inorganic compounds at a global temperature above 800° C. whereby producing partly at least one phase of a liquid material and partly at least one phase of a gaseous material. The processing is carried out by gasification of the sulphite thick liquor in a gasification reactor at sub-stoichiometric conditions and in the presence of an oxidizing medium. The reactor has an opening in its bottom in the form of a chute which opens directly into a quench compartment.
    Type: Application
    Filed: September 30, 2011
    Publication date: March 29, 2012
    Applicant: CHEMREC AKTIEBOLAG
    Inventors: Ingvar Landalv, Erik Furusjo, Ragnar Stare
  • Patent number: 8088199
    Abstract: A method for obtaining particulate calcium carbonate having an average particle size less than about 12 microns is provided. The method includes the steps of (1) withdrawing from a pulp mill a mixture containing calcium carbonate; (2) treating the mixture to remove contaminants contained in the mixture to produce a treated mixture containing calcium carbonate and further having a chemical composition and/or purity which substantially inhibits the fusing together of calcium carbonate particulates; (3) recovering from the treated mixture particulate calcium carbonate having an average particle size less than about 12 microns. The calcium carbonate produced has a high surface area to volume ratio and is therefore highly reactive and suitable for numerous applications such as in the treatment of soil, filler paper production, paint production, and contaminant containment in coal stack emission assemblies.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: January 3, 2012
    Assignee: S&S Lime, Inc.
    Inventors: Gary Allen Olsen, John Carl Stuever, Susan Candace Stuever
  • Patent number: 8044120
    Abstract: The present invention relates to a liquid composition which comprises at least one polymer and at least one ionic liquid, the cations of which are derived from polycyclic amidine bases, and a process for isolating cellulose from cellulose-containing sources using at least one such ionic liquid.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: October 25, 2011
    Assignee: BASF Aktiengesellschaft
    Inventors: Giovanni D'Andola, Laszlo Szarvas, Klemens Massonne, Veit Stegmann