Burning The Impurity Patents (Class 423/207)
  • Patent number: 9175136
    Abstract: Sodium carbonate (Na2CO3) having a certain particle size distribution and its use in preparing poly(aryl ether ketone)s, especially PEEK. Poly(aryl ether ketone)s made using the described sodium carbonate. A method for providing a sodium carbonate having a certain particle size distribution, which is especially well suited for the preparation of poly(aryl ether ketone)s.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: November 3, 2015
    Assignee: Solvay Advanced Polymers, L.L.C.
    Inventor: Chantal Louis
  • Patent number: 8968689
    Abstract: A method is disclosed for treating residues from biodiesel production for the isolation of highly pure potassium sulphate from potassium sulphate-containing sludge. First, potassium sulphate-containing sludge from biodiesel production is heated in the first stage under non-oxidizing conditions to a material temperature between 400 and 700° C.; in a second stage the product from the first stage is heated under oxidizing conditions to material temperatures between 700 and 900° C.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: March 3, 2015
    Assignee: Remondis Production GmbH
    Inventors: Andreas Huebner, Alfred Schiffer
  • Publication number: 20130230439
    Abstract: A method is disclosed for treating residues from biodiesel production for the isolation of highly pure potassium sulphate from potassium sulphate-containing sludge. First, potassium sulphate-containing sludge from biodiesel production is heated in the first stage under non-oxidizing conditions to a material temperature between 400 and 700° C.; in a second stage the product from the first stage is heated under oxidizing conditions to material temperatures between 700 and 900° C.
    Type: Application
    Filed: November 16, 2011
    Publication date: September 5, 2013
    Applicant: REMONDIS PRODUCTION GMBH
    Inventors: Andreas Huebner, Alfred Schiffer
  • Publication number: 20120100051
    Abstract: The present invention generally relates to processes for recovery of phosphorus values and salt impurities from aqueous waste streams. In particular, the present invention relates to processes for recovery of phosphorus values and salt impurities from aqueous waste streams generated in the manufacture of phospho-herbicides, including N-(phosphonomethyl)glycine and glufosinate.
    Type: Application
    Filed: May 13, 2010
    Publication date: April 26, 2012
    Applicant: MONSANTO TECHNOLOGY LLC
    Inventors: Chil Y. Choi, Gregory A. Hartmann, Peng Lei, Fuchen Liu, William Poncez, Peter E. Rogers, William A. Scholle, Lowell Smith, Robert B. Weisenfeld, Chen-Hsyong Yang
  • Patent number: 7901644
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: March 8, 2011
    Assignee: GreatPoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 7897126
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: March 1, 2011
    Assignee: Greatpoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Publication number: 20090169449
    Abstract: Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Applicant: GreatPoint Energy, Inc.
    Inventors: Alkis S. Rappas, Robert A. Spitz
  • Patent number: 6425976
    Abstract: The invention refers to a method for black liquor gasification in recovery boilers, of the type having a lower portion, referred to as a lower furnace and an upper portion, referred to as an upper furnace, black liquor sprayers for introduction of black liquor provided in the boiler above the lower furnace, and a number of combustion air levels, whereby the invention incorporates adding oxygen enriched air to the combustion air or directly into the lower furnace at at least one air level underneath the liquor sprayers for the purpose of creating the best possible reducing conditions in the lower furnace, redistributing from the lower furnace combustion air not needed therein following the addition of oxygen enriched air, thereby significantly reducing upward gas velocity underneath the black liquor sprayers, and introducing the redistributed combustion air in the upper furnace, thereby creating the reducing conditions and a controlled temperature in the lower furnace for emission control.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: July 30, 2002
    Assignee: AGA AB
    Inventors: Kent K Sandquist, Anders Kullendorff
  • Patent number: 6228214
    Abstract: The invention refers to a method for black liquor gasification in recovery boilers, of the type having a lower portion, referred to as a lower furnace and an upper portion, referred to as an upper furnace, black liquor sprayers for introduction of black liquor provided in the boiler above the lower furnace, and a number of combustion air levels, whereby the invention incorporates adding oxygen enriched air to the combustion air or directly into the lower furnace at at least one air level underneath the liquor sprayers for the purpose of creating the best possible reducing conditions in the lower furnace, redistributing from the lower furnace combustion air not needed therein following the addition of oxygen enriched air, thereby significantly reducing upward gas velocity underneath the black liquor sprayers, and introducing the redistributed combustion air in the upper furnace, thereby creating the reducing conditions and a controlled temperature in the lower furnace for emission control.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: May 8, 2001
    Assignee: AGA AB
    Inventors: Kent K Sandquist, Anders Kullendorff
  • Patent number: 5984987
    Abstract: Aqueous black liquor is gasified in a molten salt by spraying the black liquor into an enclosed zone above the surface of a turbulent molten salt pool. The black liquor is dried by means of hot gases rising from the surface of the pool and the resulting solid particles falling into the turbulent molten salt pool are dispersed and converted into a combustible gas and a reduced melt in which sulfide comprises at least about 95% of the total sulfur present. In a preferred embodiment the product gas is purified, burned and utilized in a gas turbine.
    Type: Grant
    Filed: June 26, 1990
    Date of Patent: November 16, 1999
    Assignee: Boeing North American, Inc.
    Inventor: Arthur L. Kohl
  • Patent number: 5702570
    Abstract: Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide, converting the sodium sulphide to sodium bicarbonate, and converting the sodium bicarbonate to sodium hydroxide. The operations preferably are effected in conjunction with a bleached kraft pulp mill operation, so as to utilize by-product sodium sulphate from chlorine dioxide generation to produce useful sodium hydroxide as sulphur without co-producing chlorine.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: December 30, 1997
    Assignee: Thor Technology Corporation
    Inventors: James W. Smith, Hoc Nghia Tran
  • Patent number: 5545385
    Abstract: The specification describes a process for recovering alkali metal hydroxides from an organic liquor such as black liquors derived from pulping wood chips. The organic liquor is burned in a fluidised bed combustion furnace containing fluidised particles of an iron rich mixed oxide of an alkali metal and iron. Particles of alkali metal ferrite are extracted from the furnace and dissolved in a solution of alkali metal hydroxide to form a more concentrated solution of alkali metal hydroxide and a precipitate of the iron rich mixed oxides of alkali metal and iron. A mixed oxide disclosed in the specification generally has the following formula: NaFe.sub.5 O.sub.8.4H.sub.2 O.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: August 13, 1996
    Assignee: Amcor Limited
    Inventors: Heiko Wunder, Robert E. Scott-Young, Kenneth N. Maddern, Mark C. Corrigan
  • Patent number: 5405496
    Abstract: The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, completely or partly to a reactor operating at increased temperature which is obtained by energy supply from an external heat source and/or release of energy from the black liquor, a melt essentially consisting of sodium sulphide being formed and withdrawn to be further processed to cooking liquor. The process of the invention is characterized in that in addition there are fed to the reactor the whole or part of sulphur-containing and/or sulphur- and sodium-containing materials present in the pulp mill, including sulphur-containing and/or sodium- and sulphur-containing make-up chemicals used for the total chemicals balance of the pulp mill, in such a way that the mole ratio of sodium to sulphur in the total mixture fed to the reactor is within the range of 1.5 to 4.
    Type: Grant
    Filed: January 3, 1994
    Date of Patent: April 11, 1995
    Assignee: Chemrec AB
    Inventors: Mats-Olov Hedblom, Hans Lindberg
  • Patent number: 4913736
    Abstract: A process for recovering Platinum Group metals from material comprising one or more Platinum Group metals and one or more Group IA metals supported on carbon comprises heating at a temperature between 700.degree. C. and 1150.degree. C. in a stream of an inert gas or vacuum then in a stream of carbon dioxide.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: April 3, 1990
    Assignee: The British Petroleum Company p.l.c.
    Inventor: Edmund Gimzeski
  • Patent number: 4857282
    Abstract: A process for combusting black liquor by enriching the normal process air used in the combustion process by the addition of up to 5% oxygen.
    Type: Grant
    Filed: January 13, 1988
    Date of Patent: August 15, 1989
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Walter T. Mullen
  • Patent number: 4718978
    Abstract: A partially-oxidized spent pulping liquor is produced which is added to unoxidized strong spent pulping liquor prior, during, or subsequent to concentration to form a novel partially-oxidized, concentrated, high total solids spent pulping liquor. This novel, partially-oxidized, concentrated spent liquor is capable of being combusted in a spent liquor recovery furnace without the addition of auxiliary heating fuel with a resultant increase in the effective capacity of that furnace.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: January 12, 1988
    Assignee: James River Corporation of Nevada
    Inventors: Robert J. Spannuth, Robert A. Damon
  • Patent number: 4710269
    Abstract: The present invention relates to a method and means of increasing capacity and improving the chemical recovery process when using a conventional soda recovery boiler for recovering chemicals out of spent sulphate liquors. The spent sulphate liquor is supplied in full or in part to a liquor gasifier (8) while external energy independent of combustion is simultaneously supplied (at 16, 17). The temperature and oxygen potential are carefully controlled independently of each other by means of controlled supply of the energy. The product thus obtained is thereafter introduced in full or in part into a soda recovery boiler (1).
    Type: Grant
    Filed: January 27, 1986
    Date of Patent: December 1, 1987
    Assignee: SKF Steel Engineering AB
    Inventors: Sven Santen, Sven Eriksson, Ragnar Bernhard
  • Patent number: 4682985
    Abstract: A concentrated aqueous black liquor containing carbonaceous material and alkali metal sulfur compounds is treated in a gasifier vessel containing a relatively shallow molten salt pool at its bottom to form a combustible gas and a sulfide-rich melt. The gasifier vessel, which is preferably pressurized, has a black liquor drying zone at its upper part, a black liquor solids gasification zone located below the drying zone, and a molten salt sulfur reduction zone which comprises the molten salt pool. A first portion of an oxygen-containing gas is introduced into the gas space in the gasification zone immediatley above the molten salt pool. The remainder of the oxygen-containing gas is introduced into the molten salt pool in an amount sufficient to cause gasification of carbonaceous material entering the pool from the gasification zone but not sufficient to create oxidizing conditions in the pool.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: July 28, 1987
    Assignee: Rockwell International Corporation
    Inventor: Arthur L. Kohl
  • Patent number: 4637858
    Abstract: This invention is a process for recovering sodium hydroxide directly from black liquor. The process involves pyrolyzing the black liquor in the absence of oxygen to produce a product containing sodium carbide, and hydrolyzing the sodium carbide to form sodium hydroxide. The pyrolysis is carried out at about 4000.degree. F. using radiant energy.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: January 20, 1987
    Assignee: Crown Zellerbach Corporation
    Inventors: Edwin Matovich, Robert J. Spannuth
  • Patent number: 4486394
    Abstract: The invention relates to an improvement in a method of regenerating alkaline or alkaline earth metal oxides or hydroxides from solution particularly in delignification processes wherein a suitable transition metal such as ferric oxide is burnt with the solution to produce a mixed oxide that is subsequently treated in hot water to regenerate the alkaline or alkaline earth metal oxide or hydroxide and precipitate the transition metal oxide. The improvement controls the presence of fines in the transition metal oxide to maintain these at an acceptable level in the fluidized bed combustion zone. This is achieved by contacting the fines with spent liquor from a delignification process. The invention also provides for the pelletization of the fine material of the transition metal oxide and spent delignification liquor can be used as a binder in the formation of such pellets.
    Type: Grant
    Filed: November 1, 1983
    Date of Patent: December 4, 1984
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Kien L. Nguyen, Andrew J. Keogh, Geoffrey H. Covey
  • Patent number: 4439272
    Abstract: A method and apparatus for recovering chemical from residual liquor from a pulping operation, said residual liquor containing inorganic and organic components, pyrolyzing a portion of the organics in the liquor to produce a reducing gas and residual solids containing said inorganic component and the remainder of said organics, said reducing gas containing sulfur compounds, oxidizing the remainder of the organics and recombining the sulfur contained in said reducing gas with said inorganic components to produce suflur compounds and reducing said sulfur compounds with said reducing gas.
    Type: Grant
    Filed: January 13, 1982
    Date of Patent: March 27, 1984
    Inventor: Xuan T. Nguyen
  • Patent number: 4377439
    Abstract: A recovery system for residual liquor from a pulp mill, utilizing a fluidized bed to burn the organic material in the residual liquor and generate heat which may be recovered. Heat preferably from the flue gases is used to dry residual liquor sprayed to pellets extracted from the bed, thereby to provide pellets coated with dried residual liquor. The so coated and dried pellets are then reinjected into the bed and the organic material in the dried residual liquor is burned to generate the heat recovered from the bed.If the residual liquor is from a kraft mill sulfur compounds are in the form of sulfate and must be reduced to sulfide and a reducing stage will also be provided either in the reducing zone in existing conventional kraft system (if capacity is available) or in a separate reducing zone and some of the pellets from the bed may be directed to the reducing zone together with some of the pellets coated with dried residual liquor.
    Type: Grant
    Filed: November 20, 1980
    Date of Patent: March 22, 1983
    Assignee: Domtar Inc.
    Inventor: Albert J. Liem
  • Patent number: 4363698
    Abstract: Sawdust is mixed with partially concentrated black liquor from pulp manufacture. The sawdust, coated with the solids of the black liquor, is dried by heated air. The sawdust, coated with organic and inorganic black liquor solids, is fed to the hearth of a chemical recovery boiler. Combustion of the char formed on the boiler hearth produces heat which causes additional organic material to pyrolize. The inorganic material combines to form molten smelt. The moisture-laden, heated air from the dryer is introduced into the boiler with the secondary air and the smelt is tapped off into an aqueous solution to form green liquor.
    Type: Grant
    Filed: October 30, 1981
    Date of Patent: December 14, 1982
    Assignee: Combustion Engineering, Inc.
    Inventors: Hugh W. Nelson, George J. Prohazka, Keith W. Morris
  • Patent number: 4347226
    Abstract: The present invention is a method for disposal of noxious waste products generated in petroleum refining including spent caustic solution and concentrated sulfur effluent from treating of petroleum fractions to remove sulfur therefrom. Essentially the spent caustic solution and the concentrated sulfur effluent is incinerated in the presence of air in order to form the oxides of sulfur which react with the incinerated caustic to form alkali metal sulfides.
    Type: Grant
    Filed: March 3, 1981
    Date of Patent: August 31, 1982
    Assignee: Mobil Oil Corporation
    Inventors: Costandi A. Audeh, Saverio G. Greco
  • Patent number: 4347225
    Abstract: The present invention is a method for treating alkaline effluents resulting from petroleum processing by incinerating the effluents in the presence of oxygen and a sufficient amount of hydrogen sulfide fuel to convert the alkaline material to the corresponding sulfate.
    Type: Grant
    Filed: February 26, 1981
    Date of Patent: August 31, 1982
    Assignee: Mobil Oil Corporation
    Inventors: Costandi A. Audeh, Saverio G. Greco
  • 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: 4329199
    Abstract: The digestion of the cellulose-containing material is performed with a digestion liquor containing sulphur and sodium followed by recovery and regeneration of said digestion liquor and bleaching of the cellulose-containing material with chlorine dioxide. The SO.sub.2 -containing and possibly chloride-containing gas from the recovery boiler (11) of the process and from combustion of evil-smelling gases (20) is absorbed in an absorption liquor containing and alkali metal salt solution free of sulphur or sulphur compounds such as sulphide or thiosulphate, in a scrubber (27). The resulting scrubber liquor is mixed with acid residual solution (26) from the manufacture of chlorine dioxide, whereby sulphur dioxide (32) in gaseous state is returned to the process, whereafter the residual solution (34) free from SO.sub.
    Type: Grant
    Filed: December 7, 1979
    Date of Patent: May 11, 1982
    Assignee: SCA Development Aktiebolag
    Inventors: Per-Erik Andersson, Fall E. I. Eriksson
  • Patent number: 4322266
    Abstract: A Kraft pulping process by which spent pulping liquor is burned in a recovery furnace 12 to reduce inactive alkali sulfates therein to active alkali sulfides while producing molten smelt that when added to water forms green liquor and residual dregs bearing catalytic iron. The dregs are separated from the green liquor and divided into first and second portions. The first portion of the dregs is discarded while the second portion of dregs required to maintain a concentration of iron in the smelt at from 0.05% to 5% is recirculated back to the furnace to provide optimum catalytic reduction of alkali sulfates to alkali sulfides. A quantity of alkali metal compounds is added at 24 to the pulping liquor in line 10 to serve as a temperature depressor that, together with the co-addition of said dregs, lowers the temperature of the molten smelt in furnace 12 from approximately 800.degree. C. to a more favorable temperature of about 650.degree. C.
    Type: Grant
    Filed: January 26, 1981
    Date of Patent: March 30, 1982
    Assignee: Combustion Engineering, Inc.
    Inventor: Hugh W. Nelson
  • Patent number: 4312702
    Abstract: At start-up, a bed of pellets derived from pulp mill residual liquor is fluidized by feeding preheated air to the bed to initially raise the temperature of the bed to a temperature at which a particulate ligno-cellulosic auxiliary solid fuel may be completely consumed (800.degree.-850.degree. F.
    Type: Grant
    Filed: May 6, 1980
    Date of Patent: January 26, 1982
    Assignee: Domtar Inc.
    Inventor: George H. Tomlinson, II
  • Patent number: 4299652
    Abstract: A process is disclosed in which a waste gas containing sulfur compounds and carbon dioxide from pulp mill is contacted with an aqueous alkali solution derived from green liquor, white liquor or weak white liquor having low pH value and low sodium ion concentration and having been oxidized, whereby the sulfur compounds are absorbed as completely as possible with minimal absorption of carbon dioxide in the waste gas.
    Type: Grant
    Filed: March 5, 1980
    Date of Patent: November 10, 1981
    Assignee: Ebara Corporation
    Inventors: Kouji Masuno, Junji Nakayama, Yukio Mizoguchi, Mitsuyoshi Kaneko
  • Patent number: 4288286
    Abstract: A cellulosic pulp and bleaching process is described. The process integrates two cycles, one is a digestor liquor cycle and the other is a sulfur cycle.The digestor liquor cycle comprises the steps of digesting a fibrous cellulosic feed to form a pulp, separating the pulp and bleaching it in at least one stage with chlorine dioxide, evaporating and burning the remaining waste liquor to form a smelt, dissolving the smelt to form a green liquor and utilizing the green liquor, after recausticizing, as at least a portion of the feed stock for the digestor step.The sulfur cycle of the present invention utilizes a portion of the green liquor of the digestor liquor cycle. The green liquor is carbonated to form a bicarbonate which is then stripped of H.sub.2 S. The H.sub.2 S is converted into H.sub.2 SO.sub.4 and utilized as a feed stock to a chlorine dioxide generator. The chlorine dioxide generator utilizes H.sub.2 SO.sub.4 as feed stock and produces Na.sub.2 SO.sub.4 as a by-product. The Na.sub.2 SO.sub.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: September 8, 1981
    Assignee: Hooker Chemicals & Plastics Corp.
    Inventor: Willard A. Fuller
  • Patent number: 4237103
    Abstract: A method for disposal of sodium containing waste material comprising combustion sodium containing waste material and a silica bearing material in an incinerator having interior walls lined with a refractory material which tends to react with metallic sodium and deteriorate. The sodium containing waste material comprises sodium salt and/or bases and by providing reaction conditions whereby the metallic sodium tends to react with silica to provide a combustion product including a sodium silicate compound, the combustion is carried out in manner to reduce deterioration of refractory materials by reaction with metallic sodium. Also disclosed is a method for the simultaneous disposal of sodium containing waste material and rice hulls which contain silica and provide a portion of the combustion energy.
    Type: Grant
    Filed: June 29, 1978
    Date of Patent: December 2, 1980
    Assignee: Combustion Engineering, Inc.
    Inventor: Glen V. Prible
  • Patent number: 4224289
    Abstract: In the regeneration of alkaline liquors as used in paper pulping, a mixed oxide compound of an alkali or alkaline earth metal oxide and an oxide of Ti, Fe, Co, Ni, or Mn is formed by burning black liquor. The burning step is carried out in a fluidized bed. The mixed oxide product is washed in cold water and subsequently treated with hot water to precipitate the oxide of Ti, Fe, Co, Ni or Mn and enable recovery of the alkaline solution for recycling.
    Type: Grant
    Filed: April 18, 1979
    Date of Patent: September 23, 1980
    Assignee: Australian Paper Manufacturers Limited
    Inventors: Geoffrey H. Covey, William H. Algar
  • Patent number: 4212702
    Abstract: A process for recovery of chemicals from a sodium sulfite pulping waste liquor is disclosed in which a smelt obtained from the waste liquor is introduced into an aqueous slurry containing solidified smelt while make up water and a weak aqueous slurry are supplied to effect incomplete dissolution of the smelt into the aqueous slurry to maintain the content of total solid and the temperature of the slurry at constant levels, the resulting aqueous slurry is subjected to a solid-liquid separation to obtain a wet cake having the molar ratio of S/Na.sub.
    Type: Grant
    Filed: August 30, 1978
    Date of Patent: July 15, 1980
    Assignee: Ebara Manufacturing Company, Limited
    Inventors: Saburo Mizuguchi, Isao Nomura, Takeyuki Naito, Masato Onodera, Kouji Saito
  • Patent number: 4208245
    Abstract: The present invention discloses a process of pretreating a waste black liquor which results from the pulping of various vegetative fibers and wherein the pulping liquor contains as its active pulping ingredient sodium and sulfur with the pretreatment taking place prior to the subjecting of the waste black liquor to a hydropyrolysis reaction. The method and the materials used in the pretreatment are derived from the reaction products resulting from the hydropyrolysis reaction. The pretreatment serves to enable one to regenerate the inorganic chemical values a pulping liquor in an easy and economical manner and the pretreatment, also, serves to appropriately adjust the physical and chemical characteristics of the char produced in the hydropyrolysis reaction. This is accomplished primarily by utilizing the products resulting from the hydropyrolysis reaction.
    Type: Grant
    Filed: September 7, 1978
    Date of Patent: June 17, 1980
    Assignee: St. Regis Paper Company
    Inventors: John J. Watkins, Winfried G. Timpe, deceased
  • Patent number: 4177246
    Abstract: Materials with unfulfilled chemical oxygen demand are oxidized in a liquid environment at superatmospheric temperatures and pressures. The liquid environment is created within a pressure vessel by an inert liquid that is capable of absorbing and dispersing oxygen. Generated heat is captured for further useful work.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: December 4, 1979
    Inventors: Xerxes T. Stoddard, Vesper A. Vaseen, Ruel C. Terry
  • Patent number: 4154643
    Abstract: An alkali metal-containing spent liquor is treated to recover the alkali metal content for reuse without the need for recycling furnace ash and forming solid pellets therefrom. A mixture of aluminum hydrate and alkali metal-containing waste liquor is directed through a heated furnace and dried to form granules of the aluminum hydrate and waste liquor solids, and the organic content of the granules are combusted and reacted to form granular alkali metal aluminate furnace ash. The granular furnace ash is removed from the furnace and treated to recover the alkali metal and to produce aluminum hydrate for reuse in the process.
    Type: Grant
    Filed: February 6, 1978
    Date of Patent: May 15, 1979
    Assignee: Sonoco Products Company
    Inventors: William R. Cook, Donald R. Sheeley, Joel A. Tyner
  • Patent number: 4148684
    Abstract: An improved method for recovering spent sodium and sulfur components in sodium sulfite and sodium bisulfite pulping operations. The method involves reduction burning of spent liquor to convert it to smelt and the treatment of this smelt in a sequence of operations that accelerate the reaction steps used to produce sodium hydrosulfide, hydrogen sulfide, sulfur dioxide, sodium carbonate, sodium bicarbonate and to recover sodium sulfite, sodium bisulfite, sodium carbonate and/or sodium hydroxide while preventing formation of sodium thiosulfate.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: April 10, 1979
    Assignee: MEI Systems Inc.
    Inventor: William G. Farin
  • Patent number: 4144311
    Abstract: A process for purifying organically polluted salts comprising forming a melt of said salts at a temperature of from about 600.degree.to 1000.degree. C., and contacting salt melt with an oxygen-containing gas. Acidic or basic fluxes may be present. The heat to maintain the mass molten may be supplied by electrodes which dip into the melt and which may be hollow so oxygen can be introduced therethrough. A suitable apparatus is also described.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: March 13, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Michael Grosche, Roland Hofer, Arnd Stuwe
  • Patent number: 4141785
    Abstract: A process for recovery of chemicals from a sodium sulfite pulping waste liquor is disclosed in which a smelt obtained from the waste liquor is introduced into an aqueous slurry containing solidified smelt while make up water and a weak aqueous slurry are supplied to effect incomplete dissolution of the smelt into the aqueous slurry to maintain the content of total solid and the temperature of the slurry at constant levels, the resulting aqueous slurry is subjected to a solid-liquid separation to obtain a wet cake having the molar ratio of S/Na.sub.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: February 27, 1979
    Assignee: Ebara Manufacturing Co., Ltd.
    Inventors: Saburo Mizuguchi, Isao Nomura, Takeyuki Naito, Masato Onodera, Kouji Saito
  • Patent number: 4093508
    Abstract: A process for the recovery of chemicals from the waste liquors of sulfate cellulose digestion and from the waste waters of bleaching, wherein a melt from a soda-ash roaster, mainly containing sodium sulfide and sodium carbonate, but also sodium chloride, is dissolved and clarified to produce green liquor containing carbonate, sulfide and chlorides is dissolved. The carbonate is separated from the sulfide and the chlorides, at least part of the sodium chloride is separated from the sulfide in solution, at least part of the carbonate is causticized into hydroxide, and the hydroxide and sulfide in solutions is mixed together in a ratio suitable to form a digestion solution with a desired sulfide content.
    Type: Grant
    Filed: March 10, 1975
    Date of Patent: June 6, 1978
    Assignee: A. Ahlstrom Osakeyhtio
    Inventor: Kaj Olof Henricson
  • Patent number: 4067767
    Abstract: An improved process for treating spent Kraft wood pulping liquors by coking the liquors after reducing the pH thereof with SO.sub.2 and recovering the sulfur contained in the resulting coke by contact with hydrogen preheated to temperatures in the range of 750.degree. to 2000.degree. F to produce H.sub.2 S. The H.sub.2 S and lime are added to the coker effluent to form new kraft cooking liquor.
    Type: Grant
    Filed: January 8, 1974
    Date of Patent: January 10, 1978
    Assignee: Texaco Inc.
    Inventors: Howard Vincent Hess, William Francis Franz, Edward Lawrence Cole
  • Patent number: 4049489
    Abstract: Environmental regulations tend to restrict the emissions from pulping platns, which increase the amount of sulphur and chlorine in the cooking liquor to undesirable amounts. This is detrimental to the process and increases the risk of corrosion upon the furnace walls. According to the invention certain metals, preferably iron and/or aluminum are burned together with the waste liquor, and will form compounds with the sulphur and the chlorine, respectively, which are easily separated from the chemicals taking part in the normal process cycle.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: September 20, 1977
    Inventor: Anders Vegeby
  • Patent number: 4044097
    Abstract: Soda values from the crystallizer mother liquor purge in the process of making sodium carbonate from trona are recovered by (1) mixing the purge with treating agent of magnesium oxide, aluminum oxide, bauxite, certain fine particle size calcined trona, insoluble impurities obtained in the trona-soda ash process, or mixtures thereof, (2) evaporating the resulting mixture to dryness and calcining it to insolubilize soluble silicates and to reduce contamination with carbonaceous impurities, and (3) leaching the calcined mixture with water or aqueous sodium carbonate solution.
    Type: Grant
    Filed: September 16, 1976
    Date of Patent: August 23, 1977
    Assignee: Allied Chemical Corporation
    Inventors: Alan B. Gancy, Rustom P. Poncha
  • Patent number: 4035228
    Abstract: A process and apparatus for treating concentrated alkali metal-containing waste liquor to recover the alkali metal content for reuse includes the following steps and apparatus. Concentrated alkali metal-containing waste liquor is mixed with recycled alumina and formed into solid pellets by mixing the concentrated liquor-alumina mixture with recycled alkali metal aluminate furnace ash. The solid pellets are fed through a furnace operating at a temperature below the fusion temperature of the aluminate for combusting the organic portion of the pellets and reacting the alkali metal content thereof with the alumina to form additional alkali metal aluminate ash. A portion of the furnace ash is recycled for reuse in the formation of pellets, while another portion of the ash is dissolved in water to form a solution of alkali metal aluminate. The alkali metal aluminate solution is mixed with slurry recycled from later in the process to initiate limited precipitation of alumina from the alkali metal aluminate.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: July 12, 1977
    Assignee: Sonoco Products Company
    Inventors: Donald R. Sheeley, James H. Rion
  • Patent number: 4007082
    Abstract: An improved process for the treatment of precipitator catch wherein the catch is slurried with water, sufficient carbon dioxide is added to convert the sodium carbonate present to sodium bicarbonate, and sodium chloride is separated from the sodium sulfate and sodium bicarbonate.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: February 8, 1977
    Assignee: Hooker Chemicals & Plastics Corporation
    Inventor: Willard A. Fuller
  • Patent number: 4000264
    Abstract: This invention relates to a new and improved recovery method of chemicals from waste liquor of pulping or bleaching. More particularly, this invention relates to a method for direct recovery of sodium hydroxide from waste liquor of pulping or bleaching which is substantially free from sulfur compounds. Ferric oxide is admixed with concentrated waste liquor and thereafter the admixture is burned to form a smelt. By submerging the smelt in hot water a solution of sodium hydroxide and a ferric oxide precipitate are obtained. The precipitated ferric oxide can be reused in the mixing step.
    Type: Grant
    Filed: October 1, 1974
    Date of Patent: December 28, 1976
    Assignee: Toyo Pulp Co., Ltd.
    Inventors: Tadashi Nagano, Saisei Miyao, Noriyoshi Niimi
  • Patent number: 3996097
    Abstract: An improved process for the treatment of precipitator catch wherein the catch is slurried with water, sufficient carbon dioxide is added to convert the sodium carbonate present to sodium bicarbonate, and sodium chloride is separated from the sodium sulfate and sodium bicarbonate.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: December 7, 1976
    Assignee: Hooker Chemicals & Plastics Corporation
    Inventor: Willard A. Fuller
  • Patent number: 3991160
    Abstract: Soda values from the crystallizer mother liquor purge in the process of making sodium carbonate from trona are recovered by (1) mixing the purge with treating agent of magnesium oxide, aluminum oxide, bauxite, certain fine particle size calcined trona, insoluble impurities obtained in the trona-soda ash process, or mixtures thereof, (2) evaporating the resulting mixture to dryness and calcining it to insolubilize soluble silicates and to reduce contamination with carbonaceous impurities, and (3) leaching the calcined mixture with water or aqueous sodium carbonate solution.
    Type: Grant
    Filed: June 17, 1975
    Date of Patent: November 9, 1976
    Assignee: Allied Chemical Corporation
    Inventors: Alan B. Gancy, Rustom P. Poncha
  • Patent number: 3986923
    Abstract: Sodium chloride is removed from Kraft mill smelts by fractionating the smelt to separate sodium carbonate and sodium sulphate in solid form from sodium sulphide and sodium chloride which usually is contaminated with residual quantities of sodium carbonate and sodium sulphate and is contained in an aqueous solution thereof. Sodium chloride subsequently is separated from the aqueous solution. Various fractionation procedures are described and various procedures for the removal of the sodium chloride in substantially pure form also are described.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: October 19, 1976
    Assignee: Erco Envirotech Ltd.
    Inventor: Douglas W. Reeve