For Scale Inhibiting Or Corrosion Preventing Patents (Class 203/7)
  • Patent number: 9643858
    Abstract: Methods are disclosed for manufacturing magnesium carbonate and calcium carbonate, specifically manufacturing refined carbonates such as magnesium carbonate (MgCO3) and calcium carbonate (CaCO3) through processes including electrolysis, carbon dioxide injection, and calcium oxide (CaO) or calcium hydroxide (Ca(OH)2) injection in seawater.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: May 9, 2017
    Assignee: NANOTECH CERAMICS CO., LTD.
    Inventors: Sang-Ok Jeong, Yan Wook Kim, Hak Woo Lee
  • Publication number: 20150025270
    Abstract: A production process of acetic acid according to the present invention inhibits concentration of hydrogen iodide and improves a liquid-liquid separation of an overhead from a distillation column. Acetic acid is produced by distilling a mixture containing hydrogen iodide, water, acetic acid and methyl acetate in a first distillation column (3) to form an overhead and a side cut stream or bottom stream containing acetic acid, cooling and condensing the overhead in a condenser (C3) to form separated upper and lower phases in a decanter (4). According to this process, a zone having a high water concentration is formed in the distillation column above the feed position of the mixture by feeding a mixture having a water concentration of not less than an effective amount to not more than 5% by weight (e.g., 0.5 to 4.5% by weight) and a methyl acetate concentration of 0.5 to 9% by weight (e.g., 0.5 to 8% by weight) as the mixture to the distillation column and distilling the mixture.
    Type: Application
    Filed: March 12, 2013
    Publication date: January 22, 2015
    Applicant: DAICEL CORPORATION
    Inventors: Masahiko Shimizu, Hiroyuki Miura, Takashi Ueno, Hidehiko Nakajima
  • Publication number: 20150014142
    Abstract: A method for processing wastewater is provided. The method includes pretreating a flow of the wastewater using at least one of a softening/clarification system, a sludge handling system, a filtration system, and an ammonia stripping system, evaporating the pretreated flow to produce at least a distillate and an evaporator brine; separating the evaporator brine to produce a liquid recycle stream and salt crystal mixture; and channeling the liquid recycle stream to a feed stream. The method eliminates the salt drying process that significantly reduces the costs of construction and operation of the standard zero process water discharge process.
    Type: Application
    Filed: September 19, 2014
    Publication date: January 15, 2015
    Inventors: Dinh-Cuong Vuong, James Scott Kain
  • Publication number: 20150000914
    Abstract: We provide an evaporation based zero-liquid discharge method for generation of steam for enhanced oil recovery (EOR) processes utilizing once-through steam generators (OTSGs). The method includes feeding the OTSG(s) with produced water, vaporizing a fraction of this water for steam injection and blowing down the balance of the water. This water, referred to as OTSG blowdown, can be flashed to produce a vapor stream and a liquid that is fed to a mechanical vapor compression (MVC) evaporative process. The latent energy contained in the vapor stream generated by the upstream flash is beneficially recycled to substantially reduce or eliminate the energy consumption of the MVC process. The evaporative process can be used to reduce the liquid waste for disposal or eliminate the need for liquid disposal by achieving zero liquid discharge.
    Type: Application
    Filed: December 18, 2013
    Publication date: January 1, 2015
    Inventors: Gregory J. Mandigo, Daniel P. Bjorklund
  • Patent number: 8709257
    Abstract: A method and system for purifying liquid using waste heat is provided. Initially, a liquid is mixed with an anti-sealant agent in a first filtering unit to form a liquid mixture. Thereafter, the liquid mixture is filtered in the first filtering unit to separate foreign objects from the liquid mixture. Subsequently, the liquid mixture is heated in a pipe arrangement connecting the first filtering unit and one or more second filtering units to generate steam. The steam obtained from the heated liquid mixture is then purified in the one or more second filtering units. Thereafter, the purified steam is condensed in the pipe arrangement to obtain the purified liquid.
    Type: Grant
    Filed: April 20, 2010
    Date of Patent: April 29, 2014
    Assignee: King Abdulaziz City for Science and Technology (KACST)
    Inventors: Mazen Abdullah Ba-Abbad, Hany Abdulrahman Al-Ansary
  • Publication number: 20140061023
    Abstract: According to one embodiment, a treatment apparatus includes a treatment liquid storage unit and a supply unit. The treatment liquid storage unit is configured to store a treatment liquid containing an acid and an oxidizing substance. The supply unit is configured to supply the treatment liquid stored in the treatment liquid storage unit to a fluid extracted via a production well.
    Type: Application
    Filed: August 27, 2013
    Publication date: March 6, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Hideaki HIRABAYASHI, Naoaki Sakurai, Naoya Hayamizu
  • Publication number: 20140034475
    Abstract: A water vapor distillation apparatus. The apparatus includes a source fluid input, an evaporator condenser whereby the source fluid input is fluidly connected to the evaporator condenser and the evaporator condenser transforms source fluid into steam and transforms compressed steam into product fluid, and a steam chest fluidly connected to the evaporator condenser, whereby the steam flows from the evaporator condenser into the steam chest, the steam chest comprising a foam mitigation device wherein the foam mitigation device mitigates foam in the water vapor distillation apparatus.
    Type: Application
    Filed: April 5, 2013
    Publication date: February 6, 2014
    Applicant: DEKA Products Limited Partnership
    Inventors: Dean Kamen, Ryan K. LaRocque, Christopher C. Langenfeld, Paul R. Ambler
  • Patent number: 8603301
    Abstract: A method and apparatus for producing high purity distillate in evaporators. is useful for evaporation of waters where volatile silica or organic compounds are encountered such as in production of hydrocarbons from geological formations. An evaporator having a contaminant reduction system is provided. The contaminant reduction system includes an upflow first mist eliminator portion to remove entrained liquid droplets and produce an intermediate purity water vapor stream. A continuous spray system provides a spray of dilute caustic solution in a selected spray configuration for mass transfer contact with the passing intermediate purity water vapor stream, to remove volatile silica compounds therefrom, and produce a partially decontaminated steam stream having mist particles therein. An upflow second mist eliminator portion is provided to remove the residual mist particles, and produce a high purity water vapor stream. The high purity water vapor stream is condensed to provide a high purity distillate stream.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: December 10, 2013
    Assignee: General Electric Company
    Inventors: William F. Heins, Gregg L. Wilson
  • Publication number: 20130264186
    Abstract: Acetic acid is produced while efficiently inhibiting condensation of hydrogen iodide in a distillation column (second distillation column) for purifying crude acetic acid by further distillation.
    Type: Application
    Filed: December 1, 2011
    Publication date: October 10, 2013
    Applicant: DAICEL CORPORATION
    Inventors: Masahiko Shimizu, Ryuji Saito, Hiroyuki Miura, Takashi Ueno
  • Publication number: 20120234664
    Abstract: A thermal desalination process comprising: introducing a feed solution into a thermal separation unit, distilling the feed solution in the thermal separation unit to produce a distillate stream and a residual stream having a higher solute concentration than the feed solution, contacting a portion of the residual stream from the thermal separation unit with one side of a selectively permeable membrane, contacting the opposite side of the selectively permeable membrane with a portion of the feed solution, such that water flows across the membrane to dilute the residual stream by direct osmosis, and introducing at least a portion of the diluted residual stream into the thermal separation unit.
    Type: Application
    Filed: October 26, 2010
    Publication date: September 20, 2012
    Applicant: Surrey Aquatechnology Ltd.
    Inventor: Peter Nicoll
  • Publication number: 20120145528
    Abstract: One exemplary embodiment can be an apparatus for treating a hydrocarbon stream having one or more compounds with a boiling point of about 140° to about 450° C. The apparatus can include an extraction zone and a regeneration zone. The extraction zone can include at least one settler. Each settler can have a height and a length. Typically the length is greater than the height. Also, the settler can form a boot, which can be adapted to receive a feed at one end. The regeneration zone may include a regenerator for an ionic liquid. The regenerator can include a column adapted to provide a regenerated ionic liquid to the extraction zone.
    Type: Application
    Filed: February 17, 2012
    Publication date: June 14, 2012
    Applicant: UOP LLC
    Inventors: David Nathan Myers, Manuela Serban, Kurt Vanden Bussche, Alakananda Bhattacharyya, Luigi Laricchia, John Patrick Brady
  • Patent number: 8118995
    Abstract: A method for inhibiting the formation of fouling materials including contacting hydrocarbon media containing aldehyde compounds with an antifoulant while treating the hydrocarbon media with a basic wash. The antifoulant includes a reducing sugar.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: February 21, 2012
    Assignee: General Electric Company
    Inventors: Mary King, Cato Russell McDaniel
  • Publication number: 20120006671
    Abstract: Methods for inhibiting scale formation in evaporators of the type used to produce aqueous distillate from produced waters such as those waters that are commonly formed in steam assisted gravity drainage (SAGD) oil recovery methods are provided. In accordance with the invention, a chelant selected from EDTA, DTPA, NTA, and HEEDTA is added to the recirculating evaporator system brine or to the feedwater to such systems.
    Type: Application
    Filed: July 7, 2010
    Publication date: January 12, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventor: James Charles Nowak
  • Patent number: 8057642
    Abstract: This invention relates to a process for reducing the corrosion rate of iron-containing vessels within an ethylene glycol distillation system. The inventive process includes the addition of an additive component of sodium nitrite and sodium hypophosphite into such iron-containing vessels, to thereby react with iron of the inside walls and form a protective coating thereon. This process reduces the corrosion rate in iron-containing vessels of the apparatus, and reduces the catalytic effects of iron corrosion products within the system. Thus, not only is the on-stream time of the vessels extended, but also product quality is improved by reducing the aldehyde content of the final ethylene glycol product.
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: November 15, 2011
    Assignee: SD Lizenzverwertungsgesellschaft mbH & Co. KG
    Inventors: Barry Billig, James Mann
  • Publication number: 20110253522
    Abstract: A method and system for purifying liquid using waste heat is provided. Initially, a liquid is mixed with an anti-sealant agent in a first filtering unit to form a liquid mixture. Thereafter, the liquid mixture is filtered in the first filtering unit to separate foreign objects from the liquid mixture. Subsequently, the liquid mixture is heated in a pipe arrangement connecting the first filtering unit and one or more second filtering units to generate steam. The steam obtained from the heated liquid mixture is then purified in the one or more second filtering units. Thereafter, the purified steam is condensed in the pipe arrangement to obtain the purified liquid.
    Type: Application
    Filed: April 20, 2010
    Publication date: October 20, 2011
    Applicant: KING ABDUL AZIZ CITY FOR SCIENCE AND TECHNOLOGY
    Inventors: Mazen A. Ba-Abbad, Hany A. Al-Ansary
  • Patent number: 8029650
    Abstract: A method for purifying used antifreeze is disclosed. An antifreeze recycling systems uses a simple-distillation apparatus adapted to distill clean antifreeze from used antifreeze. A novel scraper blade is used in the simple-distillation apparatus. Also, antifreeze recycling methods that minimize waste and generate nontoxic, landfillable waste are provided. An antifreeze product produced by the present method, and a nontoxic, landfillable sludge product produced by the present method, are disclosed.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: October 4, 2011
    Inventor: Dale L. Letcher
  • Publication number: 20110219769
    Abstract: Geothermal brine always contains some carbon dioxide in solution. Separating steam from geothermal brine removes the carbon dioxide, sharply increasing the pH of the brine and causing precipitation of pH sensitive minerals, including calcium carbonate, magnesium silicate and other metal silicates, clays, and metal sulfides. The binary heat exchanger in a steam-binary hybrid geothermal power plant is especially sensitive to scale deposition from flashed geothermal brine, and application of expensive scale inhibitors is required. Deposition of scale in the binary heat exchanger can be controlled by separating a small amount of gas-rich vapor from the brine before the main stage of steam separation, and combining this gas rich vapor with the flashed brine before in enters the binary heat exchanger. The carbon dioxide thus added to the brine will decrease pH, decreasing or completely blocking precipitation and deposition of pH sensitive minerals as scale.
    Type: Application
    Filed: May 17, 2011
    Publication date: September 15, 2011
    Inventor: Oleh Weres
  • Publication number: 20110214980
    Abstract: The present invention relates to the field of corrosion inhibition in hydrocarbon fluid processing units. The present invention comprises a new additive for inhibiting acid corrosion comprising polymeric thiophosphate ester, which is obtained by reaction of a polymer compound having mono, di or poly hydroxyl group, preferably polymer compound which is hydroxyl-termination, more preferably said polymer compound comprising hydroxyl-terminated polyisobutylene or polybutene and phosphorous pentasulphide. Said polymeric thiophosphate ester is further reacted with any oxide selected from group consisting of ethylene oxide, butylenes oxide or propylene oxide or such other oxide, preferably ethylene oxide, capably forming ethylene oxide derivative of thiophosphate ester. The invention is useful effecting acid corrosion inhibition on the metal surfaces of a distillation unit, distillation column, trays, packing and pump around piping.
    Type: Application
    Filed: August 25, 2009
    Publication date: September 8, 2011
    Inventor: Mahesh Subramaniyam
  • Publication number: 20110079503
    Abstract: Method and apparatus for producing high purity distillate in evaporators. The method and apparatus is useful for evaporation of waters where volatile silica compounds are encountered, and in cases where volatile organic compounds are encountered, such as in production of hydrocarbons from geological formations. An evaporator having a contaminant reduction system is provided. The contaminant reduction system includes an upflow first mist eliminator portion to remove entrained liquid droplets and produce an intermediate purity water vapor stream. A continuous spray system provides a spray of dilute caustic solution in a selected spray configuration for mass transfer contact with the passing intermediate purity water vapor stream, to remove volatile silica compounds therefrom, and produce a partially decontaminated steam stream having mist particles therein. An upflow second mist eliminator portion is provided to remove the residual mist particles, and produce a high purity water vapor stream.
    Type: Application
    Filed: September 29, 2010
    Publication date: April 7, 2011
    Inventors: William F. HEINS, Gregg L. WILSON
  • Patent number: 7862727
    Abstract: A method and composition for processing natural water such as seawater, brackish, and estuarine water wherein the water is concentrated with or without heating comprising adding to the water (I) a water-soluble polymeric phosphonate and (II) a water-soluble polycarboxylate to control scale formation and deposition. Optionally a water -soluble poly[isopropenylphosphonic acid] can also be utilized as component (I) without the addition of component (II).
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: January 4, 2011
    Assignee: General Electric Company
    Inventors: Nicholas R. Blandford, Libardo A. Perez, William S. Carey
  • Patent number: 7790001
    Abstract: This invention relates to a process for reducing the corrosion rate of iron-containing vessels within an ethylene glycol distillation system. The inventive process includes the addition of an additive component of sodium nitrite and sodium hypophosphite into such iron-containing vessels, to thereby react with iron of the inside walls and form a protective coating thereon. This process reduces the corrosion rate in iron-containing vessels of the apparatus, and reduces the catalytic effects of iron corrosion products within the system. Thus, not only is the on-stream time of the vessels extended, but also product quality is improved by reducing the aldehyde content of the final ethylene glycol product.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: September 7, 2010
    Assignee: SD Lizenzverwertungsgesellschaft mbH & Co. KG
    Inventors: Barry Billig, James Mann
  • Publication number: 20100163399
    Abstract: In a steam plant, scale adhesion to the inside of a specific device is prevented, while reducing the amount of an agent such as hydrazine to the lowest possible level. A temporary change in the chemical environment or an approximately periodic variation in the chemical environment is brought about in a channel (21) inside the prescribed device, during operation of the steam plant.
    Type: Application
    Filed: August 28, 2007
    Publication date: July 1, 2010
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Nobuo Ishihara, Sumio Yamauchi, Kazutoyo Murata, Masato Kanedome, Yasuhiko Shoda, Katsuhiko Yamakami
  • Publication number: 20100126842
    Abstract: The present invention relates to the field of processing hydrocarbons which causes corrosion in the metal surfaces of processing units. The invention addresses the technical problem of high temperature naphthenic acid corrosion and sulphur corrosion and provides a solution to inhibit these types of corrosion. The composition formed by reacting high reactive polyisobutylene (HRPIB) with phosphorous pentasulphide in presence of catalytic amount of sulphur provides high corrosion inhibition efficiency in case of high temperature naphthenic acid corrosion inhibition and sulphur corrosion inhibition. The invention is useful in all hydrocarbon processing units, such as, refineries, distillation columns and other petrochemical industries.
    Type: Application
    Filed: March 27, 2008
    Publication date: May 27, 2010
    Applicant: Dorf Ketal Chemicals (I) Private Limited
    Inventor: Mahesh Subramaniyam
  • Patent number: 7682491
    Abstract: A method of using substituted olefin polymers prepared by reacting one or more C2-C10 mono-olefin polymers having a number average molecular weight of about 300 to about 5,000 with C4-C10 monounsaturated dicarboxylic acid derivatives and compositions comprising the substituted olefin polymers for preventing fouling of hydrocarbon processing equipment, especially ethylene dichloride distillation units.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: March 23, 2010
    Assignee: Nalco Company
    Inventor: Allen R. Syrinek
  • Patent number: 7585403
    Abstract: Use of diaminopropanes, or of a composition thereof as a dispersing agent to prevent the formation or remove already formed deposits of ammonium salt in hydrocarbon process plants, such as petrochemical or refinery plants.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: September 8, 2009
    Assignee: Chimec S.p.A
    Inventors: Marco Buccolini, Andrea Zanotti, Milena Mantarro
  • Publication number: 20090159420
    Abstract: Methods for inhibiting corrosion in aqueous evaporative systems where soluble silica (SiO2) is maintained at residuals between 10 Mg/L and saturation, but more preferably maintained at greater than 300 mg/L as SiO2, to provide corrosion inhibiting silica films that protect system metals. Silica is provided by evaporation of water and subsequent concentration and transformation of silica naturally contained in source water. The methods of the present invention provide highly effective inhibition of corrosion for mild steel, copper, stainless steel, aluminum, zinc, galvanized steel and various alloys of such metals. The methods of the present invention comprise pretreatment removal of polyvalent metal ions from the makeup source water, maintenance of concentration of monovalent metal ions, and controlling pH at a minimum of 7.0 in the presence of an elevated temperature aqueous environment.
    Type: Application
    Filed: February 18, 2009
    Publication date: June 25, 2009
    Inventors: Dan A. Duke, John L. Kubis
  • Publication number: 20080164137
    Abstract: Naphthenic acid corrosivity of hydrocarbon feedstocks is correlated with the chemical composition of naphthenic acids, and especially with a ratio between an alpha fraction and a beta fraction of naphthenic acids. Contemplated plants, configurations, and methods are directed to reducing naphthenic acid corrosivity of hydrocarbon feedstocks by increasing the beta fraction over the alpha fraction.
    Type: Application
    Filed: July 1, 2004
    Publication date: July 10, 2008
    Applicant: FLUOR CORPORATION
    Inventors: Barry Messer, Bart Tarleton, Michael Beaton
  • Patent number: 7332070
    Abstract: A specific nonionic surfactant is added to a component mainly comprising hydrocarbons before passing through a heat exchanger in a petrochemical plant or a polyolefin production plant, whereby fouling of the heat exchanger can be efficiently prevented, that is, the performance of the heat exchanger can be prevented from being deteriorated, and long-term operation is feasible without sacrificing the speed of production. The nonionic surfactant is preferably a polyoxyalkylene compound represented by the general formula [I] below, more preferably a compound represented by the general formula [II] below. R1—O—[CH2—CH(R3)—O]k—R2[I] wherein R1, R2 and R3 are selected from a hydrogen atom, a C1 to C20 alkyl group, a C6 to C20 aryl group and a C1 to C20 acyl group, and may be the same or different from each other. HO—(CH2CH2O)m—[CH2CH(CH3)O]n—(CH2CH2O)pH[II] wherein m, n and p each represent the average number of repeating units, and m is in the range of 1 to 20, n is 2 to 50 and p is 1 to 20.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: February 19, 2008
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hiroto Nishida, Kouji Kishinami, Tomohiro Arase
  • Patent number: 7309403
    Abstract: The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream (10) which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine, trimethylamine, ammonia and methanol as components, where ammonia is separated off by pure distillation in a first column (1), the remaining components of the product stream obtained as bottoms (12) are fed to a second column (2). Trimethylamine (14) is separated off in the second column (2) by extractive distillation with introduction of water. The further of the product stream obtained as bottoms (15) from the second column (2) are fed to a third column (3), in which monomethylamine and dimethylamine are separated off at the top. The monomethylamine and dimethylamine are separated by distillation in a fourth column (4). To avoid corrosion alkali metal hydroxide is added to the second or third column (3).
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: December 18, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Reutemann, Theodor Weber, Karl-Heinz Ross, Manfred Julius
  • Patent number: 7205438
    Abstract: A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about 1000 ppm of N,N-disubstituted amide.
    Type: Grant
    Filed: March 9, 2005
    Date of Patent: April 17, 2007
    Assignee: Baker Hughes Incorporated
    Inventor: Marilyn Wood Blaschke
  • Patent number: 7182839
    Abstract: Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: February 27, 2007
    Assignee: Baker Hughes Incorporated
    Inventor: Marilyn Wood Blaschke
  • Patent number: 7097671
    Abstract: A methanol/water scrubbing solution containing colloidal metal sulfides formed from metal carbonyls and resulting from the scrubbing of industrial gases, such as synthesis gas, is subjected to agglomeration of the metal sulfides before the scrubbing solution to be separated enters the separating column which separates the methanol from the water containing precipitated metal sulfides. The agglomeration is carried out in a precipitation vessel and the scrubbing liquid is diluted before it enters the precipitation vessel. The result is minimal encrustation of the trays or other parts of the cleaning plant for the scrubbing solution.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: August 29, 2006
    Assignee: Lurgi AG
    Inventors: Manfred Meyer, Ulrich Wagner, Hans Kammerer
  • Patent number: 6881231
    Abstract: A composition for reducing deposition of a mineral salt from an aqueous supersaturated solution onto a solid surface in contact with the aqueous supersaturated solution which composition comprises a dispersion of either (i) seed crystals of the mineral salt in an aqueous solution of the mineral salt or (ii) seed crystals of a salt isomorphous with the mineral salt in an aqueous solution of the isomorphous salt wherein the dispersed seed crystals are of Mean particle size of less than 2.5 microns.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: April 19, 2005
    Assignees: BP Exploration Operating Company Limited, Asymptote Limited
    Inventors: Elizabeth Acton, George John Morris
  • Publication number: 20040026228
    Abstract: A process for cleaning apparatus in which (meth)acrylic acid-containing organic solvents have been treated and/or generated and contain fouling and/or polymer and residues of organic solvent, in which the apparatus contents are subjected to a steam distillation in the apparatus.
    Type: Application
    Filed: May 29, 2003
    Publication date: February 12, 2004
    Applicant: BASF Aktiengesellschaft
    Inventors: Volker Diehl, Ulrich Jager, Jurgen Schroder, Joachim Thiel
  • Publication number: 20030047439
    Abstract: Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of at least one inhibitor selected from the group consisting of C-nitrosoaniline and quinone imine oxime compounds.
    Type: Application
    Filed: January 16, 2002
    Publication date: March 13, 2003
    Inventors: Brigitte Benage, Gerald J. Abruscato, Andrew J. Eisenstein
  • Patent number: 6475347
    Abstract: Disclosed herein are compounds of the structure wherein R1, R2, and R3 are organic radicals of C1 to C20, such that the combination of the three contain at least twelve carbon atoms and R3 is bound to the methylene carbon atom between X and the aromatic ring by at least one saturated carbon atom, allowing it to be easily separated from the polymerizable monomer by distillation; R1 and R2 have sufficient steric bulk to protect the phenol from reacting with an alkoxy group or halogen bound to silicon; and X is a neutral heteroatomic radical of oxygen, nitrogen, or phosphorus; and their use as inhibitors for the polymerization of (meth)acryloxysilanes.
    Type: Grant
    Filed: August 8, 2001
    Date of Patent: November 5, 2002
    Assignee: Crompton Corporation
    Inventors: Robert E. Sheridan, Kenneth W. Hartman
  • Patent number: 6358372
    Abstract: A method of removing at least one inert reaction diluent and/or wash solvent from a waste stream from a catalyst precursor production unit is disclosed, where the waste stream includes at least one reaction diluent or wash solvent, at least one titanium alkoxide, at least one magnesium alkoxide, and at least one alkanol. At least one inert reaction diluent and/or wash solvent is removed by contacting the waste stream with a solubilization solvent, and then subjecting the resulting stream to distillation. The solubilization solvent: (i) is present in an amount sufficient to maintain solubility of residual titanium and magnesium alkoxide species; (ii) has a boiling point higher than that of the one or more reaction diluent and/or wash solvent; and optionally but preferably (iii) does not form an azeotrope with the one or more reaction diluent and/or wash solvent.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: March 19, 2002
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventor: Michael Philip Zum Mallen
  • Patent number: 6090240
    Abstract: A method of inhibiting calcium carbonate scaling in a multi-stage evaporation plant of black liquor by heat-treating calcium-containing liquor includes a first stage wherein the calcium-containing liquor is heated to about 110-145.degree. C. with direct contact with the heating medium; a second stage wherein the liquor is maintained at this temperature in a retention tank for 1-20 minutes to reduce the amount of calcium in the liquor by precipitating calcium carbonate; and a third stage wherein the heat-treated liquor is evaporated for combustion.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: July 18, 2000
    Assignee: Ahlstrom Machinery Oy
    Inventors: Henrik Eneberg, Jarmo Kaila, Erkki Kiiskila
  • Patent number: 5993607
    Abstract: In a process for the purification by distillation of chlorinated aromatic hydrocarbons originating from the chlorination of aromatic hydrocarbons in the presence of FeCl.sub.3, the crude reaction product is first partially degassed and then directly subjected to distillation in the presence of said FeCl.sub.3.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: November 30, 1999
    Assignee: Elf Atochem, S.A.
    Inventors: Raymond Commandeur, Dominique Audoux
  • Patent number: 5954924
    Abstract: Process technology is described making possible substantial improvements in the separation and recovery of highly pure vinyl aromatic monomers, notably styrene. A number of design, construction and operational features are made available for selection and use both for new plant facilities and for upgrading existing plant facilities. One major aspect of the invention is reduction in retention or residence times in the distillation towers.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: September 21, 1999
    Assignee: Yield Improvement Engineering, Inc.
    Inventor: Billie E. Art
  • Patent number: 5866011
    Abstract: A method of treating water to inhibit the formation of salt scale is disclosed. The method is particularly effective at inhibiting the formation and deposition of mineral salts in brine concentration and evaporation systems. The method comprises introducing into the system a polyepoxysuccinic acid of the general formula: ##STR1## where n ranges from about 2 to about 50, M is hydrogen or a water soluble cation such as Na.sup.+, NH.sub.4.sup.+ or K.sup.+ and R is hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: February 2, 1999
    Assignee: BetzDearborn Inc.
    Inventor: Gregory J. McGiffney
  • Patent number: 5858176
    Abstract: Methods and compositions for inhibiting fouling in vinyl monomers are disclosed. Alkylphosphonate esters or acids thereof are added to vinyl monomers, particularly ethylene dichloride, that are undergoing processing to inhibit fouling.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: January 12, 1999
    Assignee: BetzDearborn Inc.
    Inventor: Graciela B. Arhancet
  • Patent number: 5681432
    Abstract: Methods for inhibiting organic fouling of heat transfer surfaces in contact with an alcohol distillation stream are discussed. The methods include adding to the alcohol distillation stream an effective inhibiting amount of a treatment including a high molecular weight anionic polymer.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: October 28, 1997
    Assignee: BetzDearborn Inc.
    Inventors: William J. Palardy, Nancy A. DiAngelo
  • Patent number: 5676801
    Abstract: A radial-inflow large volume-rate low pressure-differential, single-stage compressor comprising 2 periphiral concentric sets of axial blades spaced circumferentially between two supporting rings and further strengthened against bending by intermediate rings if necessary. The outer set of blades rotates to impart energy to the working fluid and the inner set is stationary to recover kinetic energy. Stationary guide surfaces concentric with the blades direct the radially inward flow to axial. A diverging duct recovers further the kinetic energy. The compressor fills the pressure-ratio gap between blowers and turbo-compressors. Its use in desalination instead of the currently used centrifugal compressors, can scale-up the vapor-compression unit-size to more than three fold.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: October 14, 1997
    Inventor: Yehia El-Sayed
  • Patent number: 5659095
    Abstract: A polymerization inhibitor composition for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures comprising:(a) a benzofuroxan derivative of the formula ##STR1## wherein R is C.sub.1 -C.sub.4 alkyl or alkoxy; R.sup.1 is a nitro group; and m and n are each independently 0, 1, or 2; and(b) a solvent selected from the group consisting of toluene, xylene, ethylbenzene, vinyltoluene, divinylbenzene, alpha-methylstyrene, and a C.sub.12 -C.sub.18 hydrocarbon,and methods for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures using this composition.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: August 19, 1997
    Assignee: Uniroyal Chemical Company, Inc.
    Inventors: Howard Stephen Friedman, Gerald John Abruscato, John Matthew DeMassa, Anthony Vincent Gentile, Anthony Vincent Grossi
  • Patent number: 5641396
    Abstract: 2-amino-1-methoxypropane is used as a neutralizing amine in crude oil distillation units. The amine of the invention gives superior neutralization at the first initial condensate compared to other commonly used neutralizing amines.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: June 24, 1997
    Assignee: Nalco/Exxon Energy Chemicals L. P.
    Inventors: Veronica K. Braden, Tannon S. Woodson
  • Patent number: 5622605
    Abstract: A process and apparatus for desalinating seawater or brine and purifying water which contains minerals, salts, and other dissolved solids while simultaneously generating power. The salinous water is heated in a boiler to form steam and a concentrated brine. The concentrated brine is removed from the boiler, the steam produced in the boiler is washed with fresh water to remove trace salts and inorganic materials, and water bearing trace salts and inorganic materials are returned to the boiler. The washed steam is expanded across a turbine to generate electrical or mechanical power which is utilized as a product. The steam exhausted from the turbine is collected and condensed, and one portion of the condensed water is utilized as a fresh water product and another portion of the condensed water is used as the wash water to wash the steam produced in the boiler. Energy efficiency is improved by heat exchanging the hot concentrated brine against the salinous feed water or by flashing the brine to produce steam.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: April 22, 1997
    Inventors: Gary D. Simpson, Karl Lin
  • Patent number: 5616217
    Abstract: In the manufacture of MTBE from TBA and methanol, acidic by-products formed during the etherification reaction are removed by fractionating the etherification reaction product in a first MTBE distillation column to provide a first lower boiling distillation fraction comprising isobutylene, MTBE, methanol and acidic by-products and a first higher boiling distillation fraction comprising methanol, TBA and water, fractionating the first higher boiling distillation fraction in a recycle distillation column to provide a lower boiling TBA recycle fraction and a higher boiling water fraction, recycling the higher boiling water fraction to the MTBE distillation column at a charge point above the charge point for the etherification reaction product, and adding aqueous sodium hydroxide to the recycled higher boiling water fraction in an amount sufficient to neutralize the acidic by-products charged to the MTBE distillation column.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: April 1, 1997
    Assignee: Texaco Chemical Inc.
    Inventor: Mark E. Taylor
  • Patent number: 5578173
    Abstract: A method of removing dimethyl terephthalate (DMT) from a vapor stream. The vapor stream includes dimethyl terephthalate (DMT), methylhydroxyethyl terephthalate (MHET), glycols and methanol. A distillation column is held under an elevated pressure of 100 to 500 kPag and at a temperature of at least 85.degree. C. It has (i) a plurality of distillation trays; (ii) methanol liquid sprays between the trays; (iii) a main spray zone below the trays and (iv) a liquid pool of methanol in the bottom of the column. The vapor stream is directed into the distillation column, above the liquid pool and below the main spray zone, thereby forming a stream of liquid and vapor. The stream of liquid is directed away from the distillation column walls and into the liquid pool at the bottom of the column.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: November 26, 1996
    Assignee: Eastman Kodak Company
    Inventors: Walter E. Toot, Jr., Brian L. Simpson, Bruce R. Debruin, Andrius A. Naujokas, William J. Gamble
  • Patent number: 5556575
    Abstract: Disclosed are a method for inhibiting corrosion in crude oil distillation towers, an improvement in crude oil fractionation, a method for dispersing iron sulfide in a hydrocarbon stream and a hydrocarbon dispersion using the reaction product of hydrocarbyl succinic anhydride and an amine. The reaction product has a molecular weight of from 500-800, the hydrocarbyl substituent has 6-20 carbon atoms, and the amine is selected from EDA, DETA, TETA, TEPA, PEHA, AEP, piperazine, 1,2-PDA, 1,3-PDA, IBPA, MDA or HMDA. The imide product is a filming inhibitor used to treat metal surfaces subject to mineral acid corrosion and disperse iron sulfide particles by adding 3 to 24 ppm to sweet or sour crude contacting the metal surfaces.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: September 17, 1996
    Assignee: Nalco/Exxon Energy Chemicals L.P.
    Inventors: Elizabeth Babaian-Kibala, Veronica K. Braden, Michael K. Poindexter, Christopher J. Murphy