Basis-iron Containing Patents (Class 252/191)
  • Patent number: 10016744
    Abstract: The present invention generally relates to a process for making a metal oxide composition for use in removing contaminants from streams. A process of the present disclosure comprises contacting a metal salt with an aqueous solvent to form a metal salt mixture and reacting the metal salt mixture and a metal powder without the addition of heat. The present invention also relates to a process for making a coated metal oxide substrate.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: July 10, 2018
    Assignee: AXENS
    Inventor: Delbert C. Scranton
  • Patent number: 9821291
    Abstract: Compositions that can be used to adsorb low concentration, of unwanted or target substances from a dynamic fluid stream or from an enclosed static vapor phase. Such adsorbency can be obtained with thermoplastic materials used in the form of bulk polymer or a film, fiber, web, woven fabric, non-woven fabric, sheet, packaging and other such structures including or surrounding the enclosed volume. The concentration should be reduced to non-offensive sensed limits or a limit that does not produce a biological response.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: November 21, 2017
    Assignee: CELLRESIN TECHNOLOGIES, LLC
    Inventor: Willard E. Wood
  • Patent number: 9283539
    Abstract: Methods for preparing a composition containing amorphous iron oxide hydroxide. Methods for regeneration of the amorphous iron oxide hydroxide after it has been used as desulfurizer. Regenerable desulfurizer with high sulfur capacity containing amorphous iron oxide hydroxide, not less than 88% w/w, and organic binder not less than 7% w/w. The organic binder is sodium carboxymethylcellulose, sesbania powder, cellulose powder, or a mixture thereof A method for preparing the desulfurizer. A method for regenerating the waste agent produced after the desulfurizer and the composition containing the desulfurizer are used as desulfurizer. This method allows the desulfurizer and the composition containing the desulfurizer to be regenerated and reused avoiding the need for landfill disposal and environmental pollution.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: March 15, 2016
    Assignee: Beijing Sanju Environmental Protection and New Material Co., Ltd.
    Inventors: Zhenyi Liu, Ke Lin, Qunyang Gao
  • Patent number: 9028712
    Abstract: There are provided an oxygen scavenger composition and the like, which are excellent in economy in which the amount of oxygen absorbed per unit volume of the oxygen scavenger composition is large, and rusting at high humidity is inhibited. The oxygen scavenger composition of the present invention comprises (A) an iron powder, (B) a metal bromide and/or a metal iodide, and (C) a thiosulfate.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: May 12, 2015
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventor: Takashi Nakata
  • Patent number: 9023237
    Abstract: The invention involves the formation of a stable iron (II) oxide and/or hydroxide. Preferably these oxides and/or hydroxides are present as nanoparticles in the 5-10 nanometer range. It has been discovered that such particles can be formed at lower cost and with fewer impurities by using ferrous carbonate (FeCO3) from siderite as compared to known processes from various iron salts such as sulfates and chlorides. The novel nanoparticles are particularly adapted to removing sulfur compounds such as H2S from liquid and/or gaseous streams, such as hydrocarbon streams.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: May 5, 2015
    Assignee: New Technology Ventures, Inc.
    Inventors: Floyd E. Farha, Veronica M. Irurzun
  • Patent number: 8968692
    Abstract: The present invention relates to a method for removing sulfur from a gaseous or liquid mixture. This method involves contacting the gaseous or liquid mixture with an iron-enriched matrix under conditions effective to remove sulfur from the mixture through adsorption of the sulfur to the matrix. The iron-enriched matrix used in this method is a lignocellulosic material that is enriched with iron. The present invention also relates to a system, composition, and plant fertilizer that contain the iron-enriched matrix. Methods of making the composition and preparing a plant fertilizer are also disclosed.
    Type: Grant
    Filed: October 16, 2009
    Date of Patent: March 3, 2015
    Assignee: Cornell University
    Inventor: Gary E. Harman
  • Publication number: 20150056114
    Abstract: Disclosed are a compound including an oxalate, a carbon dioxide absorbent including the same, a method of preparing the carbon dioxide absorbent and a method of removing carbon dioxide, which may overcome issues of high recycling energy and low absorptivity of a conventional carbon dioxide absorbent to considerably reduce recycling energy and absorb a greater amount of carbon dioxide per unit absorbent, so that a size of a carbon dioxide absorption tower may be reduced and a less amount of recycling energy may be used, contributing to a substantial decrease in device manufacture costs and management costs.
    Type: Application
    Filed: December 24, 2013
    Publication date: February 26, 2015
    Applicant: KOREA INSTITUTE OF ENERGY RESEARCH
    Inventors: Soon Kwan JEONG, Yeo II YOON, Sung Chan NAM, Soo Hyun CHOI, Sung Ho YOON, Nam Seok KIM, Bon Sik JOO
  • Publication number: 20140374654
    Abstract: The invention involves the formation of a stable iron (II) oxide and/or hydroxide. Preferably these oxides and/or hydroxides are present as nanoparticles in the 5-10 nanometer range. It has been discovered that such particles can be formed at lower cost and with fewer impurities by using ferrous carbonate (FeCO3) from siderite as compared to known processes from various iron salts such as sulfates and chlorides. The novel nanoparticles are particularly adapted to removing sulfur compounds such as H2S from liquid and/or gaseous streams, such as hydrocarbon streams.
    Type: Application
    Filed: June 19, 2013
    Publication date: December 25, 2014
    Applicant: New Technology Ventures, Inc.
    Inventors: Floyd E. Farha, Veronica M. Irurzun
  • Patent number: 8916120
    Abstract: Dry processes, apparatus, compositions and systems are provided for reducing emissions of sulfur oxides, and sulfur dioxide in particular, and/or HCl in a process employing a combination of a dolomite hydrate sorbent and a sorbent doping agent administered to achieve coverage of a three-dimensional cross section of a passage carrying SOx and/or HCl —containing gases with a short but effective residence time at a temperature effective to provide significant sulfur dioxide and/or HCl reductions with high rates of reaction and sorbent utilization. The once-through, dry process can advantageously introduce the sorbent and sorbent doping agent dry or preferably as a slurry to enable uniform treatment. Preferred sorbent doping agents include water-soluble or water-dispersible copper and/or iron compositions which can be heated to an active form in situ by the flue gases being treated.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: December 23, 2014
    Assignee: Fuel Tech, Inc.
    Inventors: Christopher R. Smyrniotis, Kent W. Schulz, Emelito P. Rivera, Mingming Fang, Ian Saratovsky
  • Publication number: 20140348736
    Abstract: The present invention discloses an adsorbent material having the following formula: CuwZnFeyAlz(OH)2(A)(y+z)/2.mH2O, wherein w+x+y+z=1; and 0.20?w?0.60; 0.20?x?0.60; 0.05?y?0.25; 0.05?z?0.25; 0.20?(y+z)?0.33; and 0.50?m?0.80; a process for producing the adsorbent material and its use for removing sulfur-containing matter from gaseous streams.
    Type: Application
    Filed: April 8, 2014
    Publication date: November 27, 2014
    Applicant: King Saud University
    Inventors: Mohammed A. OTHMAN, Waleed M. ZAHID, Ahmed E. ABASAEED
  • Publication number: 20140117282
    Abstract: Methods for preparing a composition containing amorphous iron oxide hydroxide. Methods for regeneration of the amorphous iron oxide hydroxide after it has been used as desulfurizer. Regenerable desulfurizer with high sulfur capacity containing amorphous iron oxide hydroxide, not less than 88% w/w, and organic binder not less than 7% w/w. The organic binder is sodium carboxymethylcellulose, sesbania powder, cellulose powder, or a mixture thereof A method for preparing the desulfurizer. A method for regenerating the waste agent produced after the desulfurizer and the composition containing the desulfurizer are used as desulfurizer. This method allows the desulfurizer and the composition containing the desulfurizer to be regenerated and reused avoiding the need for landfill disposal and environmental pollution.
    Type: Application
    Filed: January 3, 2014
    Publication date: May 1, 2014
    Inventors: Zhenyi LIU, Ke Lin, Qunyang Gao
  • Patent number: 8679203
    Abstract: Hydrogen sulfide and mercaptans in hydrocarbons, gas mixtures of hydrocarbons and the like may be scavenged therefrom by being brought into intimate contact with a mercaptan scavenger formulation of quaternary ammonium alkoxide or hydroxide in the presence of a high oxidative state metal such as cobalt, iron, chromium and/or nickel. The high oxidative state metal, being an oxidizer, acts as a catalyst when combined with the quaternary ethoxide or hydroxide for improved mercaptan scavenging performance.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: March 25, 2014
    Assignee: Baker Hughes Incorporated
    Inventors: Timothy J. O'Brien, Jerry J. Weers
  • Publication number: 20130302230
    Abstract: The present invention generally relates to a process for making a metal oxide composition. The present invention also relates to a process for making a coated metal oxide substrate.
    Type: Application
    Filed: April 10, 2013
    Publication date: November 14, 2013
    Inventor: Delbert C. Scranton, JR.
  • Publication number: 20130118955
    Abstract: The present invention relates to an improved desulfurization process using an ionic liquid compound of general formula C+A?, where C+ represents an organic cation such as alkyl-pyridinium, di-alkyl imidazolium and tri-alkyl imidazolium; and A? is an anion of halides of iron (III), such as, for example, FeCl4?. The desulfurization process is also improved when producing the ionic liquid compound by heating the reactants using microwave energy. The ionic liquids can be used to desulfurize hydrocarbon mixtures by a liquid-liquid extraction.
    Type: Application
    Filed: January 3, 2013
    Publication date: May 16, 2013
    Applicant: INSTITUTO MEXICANO DEL PETROLEO
    Inventor: Instituto Mexicano del Petroleo
  • Publication number: 20130092625
    Abstract: A composite magnesium hydroxide containing a carbonate group and having a large BET specific surface area, a method for producing the same and an adsorbent comprising the same. The composite magnesium hydroxide is represented by the following formula (1) and has a BET specific surface area of 100 to 400 m2/g. Mg1-xMx(OH)2-y(CO3)0.5y.mH2O ??(1) (in the above formula, M is at least one divalent metal ion selected from the group consisting of Zn2+, Cu2+, Ni2+, Co2+, Ca2+, Mn2+, Fe2+, and Ba2+, and x, y and m satisfy the following conditions: 0<x?0.5 0.02?y?0.7 0?m?1.
    Type: Application
    Filed: May 31, 2011
    Publication date: April 18, 2013
    Inventor: Tomoko Tachifuji
  • Publication number: 20090288993
    Abstract: An adsorbent for desulfurizing cracking gasoline or diesel fuel comprising 1) pillared clay, (2) inorganic oxide binder, (3) an oxide of one or more metals selected from Groups IIB, VB and VIB, and (4) at least one metal accelerant selected from cobalt, nickel, iron and manganese. The adsorbent exhibits excellent abrasion-resistant strength and desulfurization performance.
    Type: Application
    Filed: May 19, 2009
    Publication date: November 26, 2009
    Applicants: China Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
    Inventors: Jun LONG, Huiping TIAN, Wei LIN
  • Publication number: 20090288992
    Abstract: The present invention relates to an ionic liquid compound of general formula C+A?, where C+ represents an organic cation such as alkyl-pyridinium, di-alkyl imidazolium and tri-alkyl imidazolium; and A? is an anion of halides of iron (III), such as, for example, FeCl4? and to a method of producing the ionic liquid compound by heating the reactants using microwave energy. The ionic liquids can be used to desulfurize hydrocarbon mixtures by a liquid-liquid extraction.
    Type: Application
    Filed: May 26, 2009
    Publication date: November 26, 2009
    Applicant: INSTITUTO MEXICANO DEL PETROLEO
    Inventors: Natalya Victorovna Likhanova, Rafael Martinez Palou, Jorge Froylan Palomeque Santiago
  • Patent number: 6616861
    Abstract: Absorbing oxygen from a closed space at a rapid rate, particularly in food packaging, is made possible by introducing an alcohol-water mixture as an activator for iron-based absorber systems, preferably including an acid to control pH. Preferred alcohols are aliphatic alcohols, particularly, monohydric alkanols, such as methanol, ethanol, n-propanol, isopropanol, sec-butanol and t-butanol. Such absorber-activator combinations are capable of rapidly reducing the oxygen in a closed package. A preferred acid is orthophosphoric acid used in an amount sufficient to establish a pH of about 0.6 to 4. A preferred iron-based absorber system employs sponge iron, optionally including a dibasic acid cooperating with the orthophosphoric acid to control pH in the system. In one preferred embodiment, the iron-based absorber is pre-activated by contacting with the activator in the substantial absence of oxygen for a predetermined period of time.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: September 9, 2003
    Assignee: Pactiv Corporation
    Inventors: Susan P. Evans, Vinod K. Luthra, Kalathur S. V. Santhanam, R. Andrew Sloan
  • Patent number: 6126911
    Abstract: The present invention relates to the use of metal oxide particles held on carrier particles and moistened with a hygroscopic moistening agent, preferably glycol, with the moistened metal oxide particles used in a system designed to remove sulfur from dehydrated and water under-saturated gas compounds.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: October 3, 2000
    Assignee: The SulfaTreat Company
    Inventor: Delbert C. Scranton, Jr.
  • Patent number: 5520898
    Abstract: The use of base/clay composites materials as sorbents for the removal of SO.sub.2 and SO.sub.3 (SO.sub.x) from flue gas and other sulfur containing gas streams is described. The base is either an alkaline earth metal carbonate (eg. CaCO.sub.3) or hydroxide (eg. Ca(OH).sub.2) is incorporated onto the clay by precipitating from corresponding metal oxide (eg. CaO) in an aqueous clay slurry. A second metal oxide or oxide precursor, preferably selected from transition metal ions, capable of promoting the oxidation of sulfur dioxide to sulfur trioxide, is incorporated to the base/clay composite during the synthesis in the form of finely divided metal oxide powder, metal oxide sol, water soluble metal salt or as clay-intercalated metal cation. The use of clay as dispersing agent for both the basic oxide and the second metal oxide component decreases the particle agglomeration of base particles and increases the rate of SO.sub.x uptake compared to the bulk bases in current use.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: May 28, 1996
    Assignee: Board of Trustees operating Michigan State University
    Inventors: Thomas J. Pinnavaia, Jayantha Amarasekera
  • Patent number: 5472633
    Abstract: A stable, salt-free iron chelate for use in aqueous alkaline systems is prepared by contacting iron oxide with an aqueous mixture of from 30 to 45 mole percent trisodium HEDTA and from 55 to 70 mole percent EDTA, heating the mixture to dissolve the iron, and adjusting the pH to from 7 to 10 with base.
    Type: Grant
    Filed: October 6, 1992
    Date of Patent: December 5, 1995
    Assignee: The Dow Chemical Company
    Inventors: Freddie Griffin, Jr., David A. Wilson, Steven H. Christiansen
  • Patent number: 5462693
    Abstract: An air purifying agent comprising a carrier which contains short pulp fiber, on which one or more chemical components selected from the group consisting of acids, alkalis, oxidizing agents, reducing agents and antimicrobial components are supported. According to the present invention, an air purifying agent which is low in weight, is safe to handle and exhibits excellent effect in removing contaminated gases containing low concentrations of contaminants.
    Type: Grant
    Filed: May 25, 1993
    Date of Patent: October 31, 1995
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Shozo Ichimura, Seikichi Tabei, Michinori Hashimoto
  • Patent number: 5352425
    Abstract: A process for producing a sulfur sorbent composition in a mixer having a mixer paddle an energy supply is disclosed which includes hydrating an alkaline earth metal oxide in an aqueous solution containing a promoting additive selected from a group consisting of urea and mixtures of urea with a water soluble iron salt under high intensity mixing conditions with the mixer wherein the mixer is operated at a mixer paddle tip velocity of at least 500 ft/min and a mixer energy input of at least 3.5 kW-h per ton of sorbent so as to produce a sulfur sorbent composition having the following physical and chemical properties: alkaline earth metal (wt. %)--40-52, molar ratio of promoting additive to alkaline earth metal--0.001-0.2, bulk density (g/ml)--0.35-0.75, surface area (m.sup.2 /g)--5-25, pore volume (cc/g)--0.05-0.14 and mean particle size (um)--4.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: October 4, 1994
    Assignee: Intevep, S.A.
    Inventors: Domingo Rodriguez, Roy Payne, Cebers O. Gomez
  • Patent number: 5334564
    Abstract: The use of base/clay composites materials as sorbents for the removal of SO.sub.2 and SO.sub.3 (SO.sub.x) from flue gas and other sulfur containing gas streams is described. The base is either an alkaline earth metal carbonate (eg. CaCO.sub.3) or hydroxide (eg. Ca(OH).sub.2) is incorporated onto the clay by precipitating from corresponding metal oxide (eg. CaO) in an aqueous clay slurry. A second metal oxide or oxide precursor, preferably selected from transition metal ions, capable of promoting the oxidation of sulfur dioxide to sulfur trioxide, is incorporated to the base/clay composite during the synthesis in the form of finely divided metal oxide powder, metal oxide sol, water soluble metal salt or as clay-intercalated metal cation. The use of clay as dispersing agent for both the basic oxide and the second metal oxide component decreases the particle agglomeration of base particles and increases the rate of SO.sub.x uptake compared to the bulk bases in current use.
    Type: Grant
    Filed: March 5, 1992
    Date of Patent: August 2, 1994
    Assignee: Board of Trustees operating Michigan State University
    Inventors: Thomas J. Pinnavaia, Jayantha Amarasekera
  • Patent number: 5308534
    Abstract: The present invention relates to an improved sorbent for use in removing effluents such as sulfur dioxide from combustion gas streams. The sorbent comprises a hydroxide formed from an alkaline-earth based material such as lime and having incorporated therein an iron and organic compound promotion addition to enhance its ability to remove effluents from the gas stream. The sorbent is formed by co-dissolving an iron salt and an organic compound in a hydration solution and thereafter mixing the hydration solution containing the iron salt and the organic compound with an alkaline-earth based material. The sorbent thus produced may be injected into a gas stream in either dry or slurry form to remove the effluents.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: May 3, 1994
    Assignee: Intevep, S.A.
    Inventors: Domingo Rodriguez, Jose Carrazza, Alejandro Izquierdo, Cebers O. Gomez, Felix Silva
  • Patent number: 5282999
    Abstract: A process for producing a sulfur sorbent composition in a mixer having a mixer paddle an energy supply is disclosed which includes hydrating an alkaline earth metal oxide in an aqueous solution containing a promoting additive selected from a group consisting of urea and mixtures of urea with a water soluble iron salt under high intensity mixing conditions with the mixer wherein the mixer is operated at a mixer paddle tip velocity of at least 500 ft/min and a mixer energy input of at least 3.5 kW-h per ton of sorbent so as to produce a sulfur sorbent composition having the following physical and chemical properties: alkaline earth metal (wt.%)--40-52, molar ratio of promoting additive to alkaline earth metal--0.001-0.2, bulk density (g/ml)--0.35-0.75, surface area (m.sup.2 /g)--5-25, pore volume (cc/g)--0.05-0.14 and mean particle size (.mu.m)--4.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: February 1, 1994
    Assignee: Intevep, S.A.
    Inventors: Domingo Rodriguez, Roy Payne, Cebers O. Gomez
  • Patent number: 5223173
    Abstract: A method of removing hydrogen sulfide from a sour gaseous stream in a contact zone by contacting the sour gaseous stream with a H.sub.2 S selective absorbent in an aqueous alkaline solution containing a polyvalent metal chelate at a pH of about 7 to about 10 wherein the polyvalent metal chelate is in one embodiment of the invention in the reduced or lower valence state in a contact zone and is oxidized to the oxidized or higher valence state in an oxidation zone so as to convert absorbed hydrogen sulfide, hydrosulfide and/or sulfide salts present in the contact zone to sulfur. In a second embodiment, the aqueous alkaline solution and H.sub.2 S selective absorbent in contact with the gaseous stream is a mixture containing a higher valence polyvalent metal chelate together with a lower valence polyvalent metal chelate.
    Type: Grant
    Filed: September 25, 1992
    Date of Patent: June 29, 1993
    Assignee: The Dow Chemical Company
    Inventor: Gaines C. Jeffrey
  • Patent number: 5149459
    Abstract: A process for removal of H.sub.2 S from gas streams is described, the process being characterized by use of a novel iron chelate treating solution containing a specified ferric to ferrous chelate ratio and aqueous ammonia.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: September 22, 1992
    Assignee: Shell Oil Company
    Inventors: Donald C. Olson, John J. Miller, deceased, Wayne R. Miller, executor
  • Patent number: 5149460
    Abstract: A process for removal of H.sub.2 S from gas streams is described, the process being characterized by use of a novel iron chelate treating solution containing a specified ferric to ferrous chelate ratio, aqueous ammonia, and thiosulfate ion.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: September 22, 1992
    Assignee: Shell Oil Company
    Inventors: Donald C. Olson, John J. Miller, deceased, Wayne R. Miller, executor, George C. Blytas, Zaida Diaz
  • Patent number: 5130037
    Abstract: A process is provided for the froth flotation of oxide and salt type minerals utilizing as the collector a combination of a monoester of a dicarboxylic acid of the general formula ##STR1## in which R' is an aliphatic hydrocarbon group with 7-21 carbon atoms, R" is a hydrocarbon radical with 2-6 carbon atoms and A is an alkylene oxide group derived from an alkylene oxide with 2-4 carbon atoms; and a monocarboxylic acid having the general formulaR'"COOH IIwherein R'" is a hydrocarbon group with 5-23 carbon atoms, the acid as being in an amount to increase the yield and/or the selectivity of the monoester in the flotation of alkaline earth metal-containing oxide and salt type minerals, such as apatite, fluorspar, calcite, baryte, scheelite, dolomite, and magnesite.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: July 14, 1992
    Assignee: Berol Nobel AB
    Inventors: Piotr Swiatowski, Anne Andersen, Annelie Askenbom
  • Patent number: 5116426
    Abstract: A method for cleaning a surface of a substrate which comprises treating the surface with a dichloro-pentafluoro-propane solvent. The method is specifically directed to the use of 1,1-dichloro-2,2,3,3,3-pentafluoro propane and 1,3-dichloro-1,1,2,2,3-pentafluoropropane as the cleaning solvent.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: May 26, 1992
    Assignee: Asaki Glass Company Ltd.
    Inventors: Teruo Asano, Naohiro Watanabe, Kazuki Jinushi, Shunichi Samejima
  • Patent number: 5096691
    Abstract: H.sub.2 S abatement in geothermal drilling operations (e.g. drilling, flow testing and reworking) with a ferric aminocarboxylic acid chelating solution containing a stabilizer and an optional cationic polyelectrolyte catalyst which is injected in the blooie line of the well upstream of the separator. The stabilizer is a hydroxyl radical scavenger such as iodide, nitrite, amino acid, aliphatic aldehyde, sugar, ascorbate, formate and/or aryl sulfonic acid, and inhibits degradation the ferric aminocarboxylic acid complex.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: March 17, 1992
    Inventor: Stephen A. Bedell
  • Patent number: 5026503
    Abstract: An improved aqueous catalytic oxidation-reduction composition for oxidizing hydrogen sulfide to produce elemental sulfur and a method of removing hydrogen sulfide from a gas stream whereby a gas stream containing hydrogen sulfide is brought into contact with an aqueous catalytic oxidizing reaction composition containing a water soluble polyvalent metal salt having metal in the highest valence state and at least one nonionic surfactant having an HLB of from about 8 to about 10, preferably about 8.5 to about 9, which is adapted to wet the elemental sulfur formed. The nonionic surfactant is present in the reaction solution in an amount sufficient to substantially prevent formation of sulfur froth at the surface of the reaction solution and to cause the sulfur to precipitate as a granular solid that can be recovered by filtration, by centrifucation, or other similar means.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: June 25, 1991
    Assignee: Amoco Corporation
    Inventor: Robert C. Stewart
  • Patent number: 4961873
    Abstract: The present invention relates to a new alkaline absorbent solution that reduces the H.sub.2 S content in a treated gas to below 10 vppm. The absorbent solution contains two severely-hindered amines, such as bis(tertiarybutylaminoethoxy)-ethane (BTEE) and ethoxyethoxyethanol-tertiarybutylamine (EEETB), a severely hindered amine salt, and/or a severely hindered aminoacid. This invention also describes a process for the removal of H.sub.2 S from fluid mixtures using this absorbent solution to produce a very low level of H.sub.2 S in the treated fluid. The process is also suitable for the selective removal of H.sub.2 S from fluid mixtures comprising H.sub.2 S and CO.sub.2.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: October 9, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori, Eugene L. Stogryn
  • Patent number: 4895670
    Abstract: A new alkaline absorbent solution containing a severely-hindered amine and a severely-hindered aminoacid is provided. A process for the removal of H.sub.2 S from fluid mixtures using this absorbent solution to produce a very low level of H.sub.2 S in the treated fluid is also provided. The process is also suitable for the selective removal of H.sub.2 S from fluid mixtures comprising H.sub.2 S and CO.sub.2. Use of the above absorbent solution leads to higher selectivity for H.sub.2 S than observed when the severely-hindered amine is used alone without the severely-hindered aminoacid.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: January 23, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: Guido Sartori, W. S. Winston Ho
  • Patent number: 4894178
    Abstract: The present invention relates to a mixture of severely-hindered amines, such as bis-(tertiarybutylaminoethoxy)-ethane (BTEE) and ethoxyethoxyethanoltertiarybutylamine (EEETB), and a one-step synthesis method for its preparation. Besides, this invention describes the use of the mixture for the removal of H.sub.2 S, especially the selective removal of H.sub.2 S in the presence of CO.sub.2.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: January 16, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Eugene L. Stogryn, Guido Sartori
  • Patent number: 4894179
    Abstract: A new alkaline absorbent solution containing a tertiary amino azabicyclic alcohol in combination with its salt with a strong acid and/or in combination with a severely-hindered aminoacid is provided. A process for the removal of H.sub.2 S from fluid mixtures using this absorbent solution to produce a very low level of H.sub.2 S in the treated fluid is also provided. The process is also suitable for the selective removal of H.sub.2 S from fluid mixtures comprising H.sub.2 S and CO.sub.2. Use of the above absorbent solution leads to higher selectivity for H.sub.2 S without damaging capacity than observed when the tertiary amino azabicyclic alcohol is used alone without additive.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: January 16, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: Guido Santori, W. S. Winston Ho, Eugene L. Stogryn
  • Patent number: 4892674
    Abstract: A new alkaline absorbent solution containing the additive of a severely-hindered amine salt and/or a severely-hindered aminoacid to a non-hindered amine such as N-methyldiethanolamine (MDEA) is provided. A process for the removal of H.sub.2 S from fluid mixtures using this absorbent solution to produce a very low level of H.sub.2 S in the treated fluid is also provided. The process is also suitable for the selective removal of H.sub.2 S from fluid mixtures comprising H.sub.2 S and CO.sub.2. Use of the above absorbent solution leads to higher selectivity for H.sub.2 S than observed when MDEA is used alone without the additives.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: January 9, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori
  • Patent number: 4871468
    Abstract: A method of removing hydrogen sulfide and carbon dioxide from a sour gaseous stream in a contact zone by contacting the sour gaseous stream with a lean CO.sub.2 -selective absorbent in an aqueous alkaline solution containing a polyvalent metal chelate at a pH of about 7 to about 10 wherein the polyvalent metal chelate is in one embodiment of the invention in the reduce or lower valence state in a contact zone and is oxidized to the oxidized or higher valence state in an oxidation zone so as to convert hydrosulfide and/or sulfide salts present in the contact zone to sulfur. In a second embodiment, the aqueous alkaline solution and CO.sub.2 -selective absorbent contact in the gaseous stream is a mixture containing a minor amount of higher valence polyvalent metal chelate together with a major amount of a lower valence polyvalent metal chelate.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: October 3, 1989
    Assignee: The Dow Chemical Company
    Inventor: Gaines C. Jeffrey
  • Patent number: 4774071
    Abstract: A method of removing hydrogen sulfide from a gaseous stream in a contact zone by contacting the gaseous stream with an aqueous alkaline scrubbing solution containing a polyvalent metal chelate at a pH of about 7 to about 10 wherein the polyvalent metal chelate is in one embodiment all or substantially all in the reduced or lower valence state in a contact zone and is oxidized to the oxidized or higher valence state in an oxidation zone so as to convert hydrosulfide and/or sulfide salts present in the contact zone to sulfur. In a second embodiment the aqueous alkaline solution contacting the gaseous stream is a mixture containing higher and lower valence polyvalent metal chelates.
    Type: Grant
    Filed: May 1, 1986
    Date of Patent: September 27, 1988
    Assignee: The Dow Chemical Company
    Inventors: Gaines C. Jeffrey, John D. Myers
  • Patent number: 4683076
    Abstract: Process for removing H.sub.2 S from the exhaust steam in a geothermal power plant wherein the H.sub.2 S containing steam is contacted with an aqueous solution containing a ferric chelate and a cationic polymeric catalyst such as poly dimethyl diallyl ammonium chloride. The conversion of H.sub.2 S to sulfur is accelerated by the use of a small amount of the catalyst.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: July 28, 1987
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Lampton, Jr., Thomas M. Hopkins, II
  • Patent number: 4675169
    Abstract: A process for removing SO.sub.x pollutants from a stack gas by (1) absorbing the SO.sub.x pollutants into an aqueous absorbent containing a formate compound and (2) regenerating the spent absorbent containing dissolved SO.sub.x compounds by contact, in the presence of added formate anion, with a water-insoluble, solid substance containing one or more tertiary amine functional groups. Nitrogen monoxide is removed by providing in the aqueous absorbent an iron(II) chelate, such as a chelate of ferrous ion with ethylenediaminetetraacetic acid. Regeneration of the spent absorbent containing absorbed NO is accomplished under the same conditions as for spent absorbents containing absorbed SO.sub.x compounds. SO.sub.x and NO pollutants dissolved in the absorbent are, during regeneration, converted to hydrogen sulfide and nitrogen, respectively.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: June 23, 1987
    Assignee: Union Oil Company of California
    Inventor: Robert H. Hass
  • Patent number: 4550098
    Abstract: Methods are disclosed for the purification of mixed gas streams containing hydrogen sulfide, carbon dioxide, carbon monoxide, sulfur, hydrogen, and methane and other hydrocarbon gases, and mixtures thereof, by the use of an oxidizing reactive solid. In one method, the oxidizing reactive solid is, in a first step, contacted with the mixed gas stream which may contain, among other gases, hydrogen sulfide and carbon dioxide. The reactive solid removes the hydrogen sulfide in the form of elemental sulfur with no detectable formation of sulfur oxide. The reactive solid also partially removes the carbon dioxide from the mixed gas stream. In the second step of the first method, the oxidizing reactive solid is regenerated by flowing air. In a second method of the present invention, mixed gas streams, containing hydrogen sulfide and oxygen in an approximate stoichiometric amount, are contacted with the solid, and hydrogen sulfide is converted directly to sulfur with minimal formation of compounds of sulfur.
    Type: Grant
    Filed: November 12, 1982
    Date of Patent: October 29, 1985
    Assignee: The BOC Group, Inc.
    Inventor: Theodore A. Gens
  • Patent number: 4532117
    Abstract: A method, applicable to hydrogen sulfide removal systems which employ a regenerable aqueous washing solution capable of absorbing hydrogen sulfide and converting that hydrogen sulfide to elemental sulfur, is provided for reconditioning such systems after they have become contaminated with sulfur-feeding bacteria and/or for maintaining such systems substantially free of such bacteria. In the method of the invention, the aqueous washing solution is contacted with an aliphatic dialdehyde.
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: July 30, 1985
    Assignee: Union Oil Company of California
    Inventor: Dennis D. Delaney
  • Patent number: 4505776
    Abstract: A composition is provided which comprises an aqueous alkaline solution of a metal salt and black liquor, the metal salt being selected from the group consisting of iron, chromium, cobalt and nickel salts. This composition is useful in a process described for absorption of hydrogen sulfide from flue gas, followed by subsequent oxidation of dissolved sulfide to thiosulfate, if desired. The presence of the metal ions and black liquor synergistically catalyzes the overall reaction of absorption of hydrogen sulfide, followed by oxidation of the sulfide. Preferably, prior to scrubbing to remove hydrogen sulfide with the solution, the flue gas is first cooled to near its dew point, and then scrubbed with water to remove particulates. Additionally, the effluent flue gas from the absorption step is usefully scrubbed with water to recover heat, following which it is used to scrub condensates from a kraft pulp mill. The metal salt in the solution is preferably an iron salt at a concentration of about 0.002 M.
    Type: Grant
    Filed: July 8, 1982
    Date of Patent: March 19, 1985
    Assignee: Wescam Services Inc.
    Inventor: Francis E. Murray
  • Patent number: 4478803
    Abstract: A process to remove SO.sub.2 from mixtures by contacting SO.sub.2 -containing mixtures with a regenerable iron-bearing sorbent such as paint rock under reaction conditions to produce iron sulfide and an effluent containing reduced amounts of SO.sub.2.
    Type: Grant
    Filed: February 7, 1983
    Date of Patent: October 23, 1984
    Assignee: The Hanna Mining Company
    Inventor: Adolfo R. Zambrano
  • Patent number: 4366179
    Abstract: An oxygen and carbon dioxide absorbent comprising (A) a particulate substance wherein the particles of a hydrous alkali substance are covered with separator particles, (B) iron powder and (C) an electrolyte and a process for storing coffee by using the same is disclosed.
    Type: Grant
    Filed: March 11, 1981
    Date of Patent: December 28, 1982
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takanari Nawata, Toshio Komatsu, Masayuki Ohtsuka
  • Patent number: 4341745
    Abstract: Acid gases are removed from waste gases by contacting said gases with an orbent which is a direct reaction product a mixture of red mud and an alkaline earth metal hydroxide or aluminum oxide.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: July 27, 1982
    Assignee: Kommanditgesellschaft "ALBERTA" Chemische Fabrik GmbH & Co.
    Inventors: Hans Zopff, Hans-Ekkehard Muller
  • Patent number: 4252778
    Abstract: A method for removing sulfurous gases such as H.sub.2 S and COS from a fuel gas is disclosed wherein limestone particulates containing iron sulfide provide catalytic absorption of the H.sub.2 S and COS by the limestone. The method is effective at temperatures of 400.degree. C. to 700.degree. C. in particular.
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: February 24, 1981
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Ralph T. Yang, Ming-Shing Shen
  • Patent number: 4238463
    Abstract: Removal of hydrogen sulfide from gases using iron oxide-containing solids is improved by introducing a liquid containing a primary or secondary amine into the iron oxide-containing solids.
    Type: Grant
    Filed: June 28, 1979
    Date of Patent: December 9, 1980
    Assignee: Chevron Research Company
    Inventor: Stephen W. Nicksic