Residue Converted Into Liquor Different From Original Liquor Patents (Class 162/35)
  • 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: 7553394
    Abstract: In the process for producing kraft pulp, performing a potassium ion removal step of flowing an aqueous solution containing ashes recovered from a combustion exhaust gas generated in a black solution combustion step by a dust collector through a packed bed filled with a sodium-type cation exchange organic resin to adsorb and remove potassium ions contained in the aqueous solution; and a regeneration step of treating the cation exchange organic resin used in the potassium ion removal step with a solution consisting essentially of aqueous sodium hydroxide to regenerate the cation exchange resin, where a fraction recovered from the potassium ion removal step which is rich in sodium sulfate and sodium carbonate is recycled to the black solution concentrating step, and a sodium hydroxide effluent recovered from the regeneration step is recycled to a bleaching step and used in a bleaching process.
    Type: Grant
    Filed: September 11, 2003
    Date of Patent: June 30, 2009
    Assignees: Nippon Rensui Co., Hokuetsu Paper Mills, Ltd.
    Inventors: Saburo Furusho, Norio Kawano, Shigeru Wakamoto
  • Patent number: 7291245
    Abstract: The improved process is achieved by introducing depuration of green liquor and lime before causticization and two special causticization steps in causticization procedure of conventional chemical recovery processes. It not only avoids the generation of waste residue (lime mud) from the beginning and saves the re-burning and filling land of lime mud, but also can directly produce a series of precipitated calcium carbonate products with various particle sizes by regulating process conditions while alkali is recovered. The CaCO3 products include CaCO3 wherein ?50% of CaCO3 has a particle size below 2 ?m, CaCO3 wherein ?90% of CaCO3 have a particle size below 2 ?m, and a superfine CaCO3 having an average particle size <1 ?m. The CaCO3 obtained by this process can be directly used for papermaking and other industrial applications.
    Type: Grant
    Filed: April 25, 2002
    Date of Patent: November 6, 2007
    Inventors: Tianzhao Ai, Xuezhi Dong, Dong Ai
  • Publication number: 20040231810
    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: Application
    Filed: January 13, 2004
    Publication date: November 25, 2004
    Inventors: Esa Rousu, Pasi Rousu, Juha Anttila, Paivi Rousu
  • Patent number: 5938892
    Abstract: A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, at least one final chlorine dioxide bleaching stage and then recycling the filtrate from the oxidative extraction stage countercurrently through the bleaching plant and brown stock washing. Additionally, and quite beneficially, the filtrate from the first chlorine dioxide bleaching stage is also recycled countercurrently through the brown stock washing thereby significantly reducing the environmental impact associated with the manufacture of bleach wood pulp.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: August 17, 1999
    Assignee: Champion International Corporation
    Inventors: Gerald E. Maples, Raman Ambady
  • Patent number: 5853535
    Abstract: A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, optionally at least one final chlorine dioxide bleaching stage and then recycling the filtrate from the oxidative extraction stage counter-currently through the bleaching plant and brown stock washing. Additionally, and quite beneficially, the filtrate from the first chlorine dioxide bleaching stage is also recycled counter-currently through the brown stock washing thereby significantly reducing the environmental impact associated with the manufacture of bleach wood pulp.
    Type: Grant
    Filed: November 7, 1994
    Date of Patent: December 29, 1998
    Assignee: Champion International Corporation
    Inventors: Gerald E. Maples, Joseph R. Caron, John A. Fleck
  • Patent number: 5738758
    Abstract: The disclosure relates to a process for the removal of solid CaS from a gas stream in which the CaS has been formed and then the conversion of that solid CaS by reaction with an aqueous NaOH solution to produce solid Ca(OH).sub.2 and a liquor stream containing dissolved NaHS. This removal and conversion process is described as being used in conjunction with a process for gasifying black liquor from a kraft pulping process in which H.sub.2 S is scrubbed from the gases using calcium compounds to form the CaS.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: April 14, 1998
    Assignee: The University of New Brunswick
    Inventor: Adriaan R. P. van Heiningen
  • Patent number: 5667633
    Abstract: A method of producing white liquor having enhanced and/or reduced sulphidity in the recovery of chemicals in a sulphate pulp process is described. In the method one starts from a calcium sulphide rich smelt of inorganic chemicals, which has been obtained by simultaneous combustion of black liquor and processing of lime sludge. This smelt is treated with an aqueous solution, whereupon the calcium sulphide in the smelt is present in a solid form and the rest of the chemicals are in solution. Thereupon the solid calcium sulphide is separated and the obtained solution is processed as a green liquor in per se known manner to a white liquor having reduced sulphidity, whereupon optionally the separated solid calcium sulphide is mixed with the required amount of white liquor to a white liquor having enhanced sulphidity.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: September 16, 1997
    Assignee: Korsnas AB
    Inventors: Bertil Pettersson, Bertil Granqvist, Ingemar Eriksson
  • Patent number: 5582683
    Abstract: A method for the recovery of chemical values from spent lignocellulosic pulping liquor salts to produce white liquor of different sulfidities. Preferably, the white liquor is in the form of separate liquid streams, each of which is of a sulfidity that is different from the sulfidity of others of the streams. The method also provides for developing a white liquor stream which is essentially free of sulfide values, but which contains sodium hydroxide. Further, the method provides for recovery of titanium values for recycling.
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: December 10, 1996
    Assignee: International Paper Company
    Inventors: Alexander K. Bonsu, Raymond P. Thorman, M. C. Matthew
  • Patent number: 5507912
    Abstract: There is disclosed a process of increasing efficiency in a kraft pulping process that utilizes initial, bulk, and final delignification steps, a recovery boiler, and a caustic treatment step, which allows production of a white liquor stream that is separated into a sulphide-lean and sulphide-rich streams.
    Type: Grant
    Filed: December 15, 1993
    Date of Patent: April 16, 1996
    Assignee: H. A. Simons Ltd.
    Inventor: Patrik P. H. Lownertz
  • Patent number: 4762590
    Abstract: The invention concerns a causticizing procedure by which from soda liquor derived from a sulphate cellulose digesting process and from unslaked lime is produced white liquor for reuse in the digesting process, over lime slaking and a subsequent causticizing reaction proper. It is essential in the invention that the lime slaking is carried out using white liquor, whereafter the causticizing reaction proper is allowed to take place between the slaked lime and soda liquor combined therewith. The requisite white liquor is obtained by recirculating part of the white liquor produced by the causticizing process, to the slaking step, where it either completely or partially replaces the soda liquor employed in prior art. By using white liquor, one avoids the foaming, interfering with the process, which is encountered in the slaking step.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: August 9, 1988
    Assignee: Enso-Gutzeit Oy
    Inventor: Holger Engdahl
  • Patent number: 4728393
    Abstract: A deicing product comprising a mixture having, based upon the total weight of solid in said deicing product between 12% and 75% acetate salts, trace amounts and 36% carbonate salts, 1 and 24% formate salts, 1 and 32% pseudolactate salts. The cations of said salts are selected from the class consisting of sodium, magnesium, calcium, potassium. Lignin fractions and low molecular weight sugars may also be present, as well as other chemicals derived from the method of making black liquor and this new product. A method of making same is disclosed. It comprises using a black liquor obtained from a pulp mill operation, fractionating said black liquor into a low molecular weight fraction, concentrating said collected low molecular weight fraction to produce a concentrated deicing product.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: March 1, 1988
    Assignee: Domtar Inc.
    Inventor: Terence E. Peel
  • Patent number: 4508593
    Abstract: A process is provided for the recovery of sulfur dioxide liberated in the chemical pulping of lignocellulosic material, which comprises(1) collecting sulfur dioxide-containing gas emitted during the pulping and separating it into at least two portions;(2) contacting at least one portion with chlorine gas, thereby forming a gaseous mixture comprising sulfur dioxide and chlorine;(3) effecting reaction of sulfur dioxide, chlorine and water to form hydrochloric acid and sulfuric acid while forming an intimate dispersion in said gaseous mixture of an aqueous solution of hydrochloric acid and sulfuric acid;(4) dissolving said hydrochloric acid and sulfuric acid in said solution;(5) recovering said solution and separating it from substantially sulfur dioxide-free residual gas.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: April 2, 1985
    Assignee: Mo och Domsjo Aktiebolag
    Inventor: John R. Bergstrom
  • Patent number: 4507172
    Abstract: A process of producing cooking liquor for addition to a digester for enhancement of the yield derived from kraft pulping of wood chips in which a portion of the black liquor is treated with lime under certain conditions and then reused as cooking liquor. The causticizing of the black liquor results in the generation of polysulfide ions and allows, through the formation of calcium-organo complexes, for the carryover of soluble calcium with the black liquor. The presence of calcium ions synergistically enhances the effectiveness of polysulfide such that the use of the new cooking liquor results in pulp yield increases of several percentage points for the same lignin content when compared to conventional kraft pulping.
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: March 26, 1985
    Assignee: St. Regis Paper Company
    Inventor: Michael S. Steltenkamp
  • Patent number: 4481072
    Abstract: A method for recovery of wastewater residues containing the activated sludge biomass, fibre and bark comprising the steps of treating these with alkali solution having a concentration of 5-80 g/l on the Na.sub.2 O basis at a temperature of 20.degree.-70.degree. C. and dewatering the reaction mixture obtained, the alkali filtrate decanted containing the activated sludge alkali hydrolysis products being used to dissolve the melt in the course of preparing the alkali pulping liquor, and the dewatered alkali mass being added, in an amount of up to 40 percent by mass, to the fibred mass composition for the manufacture of cardboard and wood-fibre board.
    Type: Grant
    Filed: August 20, 1982
    Date of Patent: November 6, 1984
    Assignee: Vsesojuznoe Nauchno-Proizvodstven Noe Obiedinenie Tselljulozno-Bumazhnoi Promyshlennosti
    Inventors: Vladimir P. Grudinin, Boris M. Bukhteev, Tatyana V. Dergunova
  • Patent number: 4388197
    Abstract: Procedure for separating finely divided matter from a suspension by filtration in a periodically operated pressure filter including a filter tank into which the suspension to be filtered is supplied along with lime sludge (or CaCO.sub.3) as a filtering auxiliary substance. The lime sludge forms a filtering layer on the surface of filtering elements and the suspension to be filtered passes through this layer for separating sediment. The pressure filter contains a plurality of filtering elements extending downwardly from the roof of the filter tank so that the filtrate flows through the elements to a superposed filtrate collecting tank. The lime sludge collects on the outer surface of the filtering elements and is periodically detached by a countercurrent washing operation. Green liquor, from which the soda sediment is to be separated, is used as the suspension to be filtered.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: June 14, 1983
    Assignee: Enso-Gutzeit Oy
    Inventor: Juha Lumikko
  • Patent number: 4347102
    Abstract: The potassium compounds in heavy black liquor flowing in the recovery cycle are reduced by the introduction of magnesium nesosilicate to form magnesium potassium silicate which is voided from the system by filtration.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: August 31, 1982
    Assignee: Combustion Engineering, Inc.
    Inventor: Hugh W. Nelson
  • Patent number: 4334956
    Abstract: A method of utilizing kraft black liquor by converting the black liquor to "green liquor" and then oxidizing the green liquor with air in the presence of a quinone compound or spent liquor from the kraft process, the soda semi-chemical process or the neutral sulfite semi-chemical process as a catalyst. A marked improvement in the rate of oxidation is obtained. The thus oxidized green liquor is then able to be used as part at least of the digestion liquor in the NSSC process.
    Type: Grant
    Filed: November 20, 1980
    Date of Patent: June 15, 1982
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Alan Farrington, Peter F. Nelson
  • Patent number: 4153502
    Abstract: Sodium polysulphide is formed by reacting sodium sulphide and sodium sulphur-oxygen salts in the presence of carbon and oxygen. The invention is particularly applicable to reacting recovery furnace smelt from a polysulphide pulping process to form a mixture of sodium polysulphide and sodium carbonate which is substantially free from sodium sulphur-oxygen salts, so that dead-load sulphidity is substantially eliminated from the pulping liquor.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: May 8, 1979
    Assignee: Corrosion Service Company Limited
    Inventor: Walter A. Mueller
  • Patent number: 4113553
    Abstract: A process for pulping hardwood to produce cellulose pulp in good yield and of high quality, with a low requirement for causticized pulping liquor, which comprises in a first pulping stage pulping the hardwood in an alkaline pulping liquor containing sodium sulfide at a pH of about 10.5 to about 13 and at a temperature within the range from about 110.degree. to about 170.degree. C while generating hydrogen sulfide in situ by reaction of sodium sulfide with organic acids liberated in the pulping; and then in a second pulping stage, following directly after the first pulping stage, continuing the pulping at a pH higher than said first stage pH, within the range of about 12.5 to about 14 and at a temperature higher than said first stage temperature within the range from about 145.degree. to about 190.degree. C, in the presence of added alkaline pulping liquor comprising sodium hydroxide and sodium sulfide until cellulose pulp is produced.
    Type: Grant
    Filed: January 27, 1977
    Date of Patent: September 12, 1978
    Assignee: Mo Och Domsjo Aktiebolag
    Inventor: Hans Olof Samuelson
  • Patent number: 4098639
    Abstract: A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping liquor, which comprises evaporating and burning spent sulfate pulping liquor to obtain a smelt; dissolving the resulting smelt in water to form a sodium-sulfide-sodium carbonate-containing solution green liquor; regenerating pulping white liquor containing sodium sulfide and sodium hydroxide from said green liquor; and recirculating said regenerated white liquor to the pulping stage; oxidizing at least one of the resulting green and white liquors to form sodium thiosulfate therein; reacting the oxidized liquor with residual acid liquor, from the manufacture of chlorine dioxide by reduction of an alkali metal chlorate solution, to convert thiosulfate to sulfur dioxide and sulfur; removing and recovering formed sulfur dioxide; and returning the residual liquor, freed from sulfur dioxide, to the pulping.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: July 4, 1978
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Sture Erik Olof Noreus, Lars Tage Uhlin
  • Patent number: 4073678
    Abstract: 70 To 85% yield semichemical wood pulping may be prepared for mechanical defibration by cooking comminuted hardwood in a continuous digestion vessel with an alkaline cooking solution wherein 50 to 100% as sodium oxide thereof is sodium carbonate. The solution may be formulated from unmodified kraft recovery process green liquor or, if a sulfur free cooking process is desired, the solution may be formulated from soda ash.
    Type: Grant
    Filed: January 14, 1977
    Date of Patent: February 14, 1978
    Assignee: Westvaco Corporation
    Inventors: Jack A. Hammond, Elias M. Karter