Prevention Or Removal Of Corrosion Or Solid Deposits Patents (Class 585/950)
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Patent number: 6867262Abstract: Graft polymers are used as gas hydrate inhibitors.Type: GrantFiled: July 11, 2000Date of Patent: March 15, 2005Assignee: BASF AktiengesellschaftInventors: Maximilian Angel, Karin Neubecker, Axel Sanner
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Patent number: 6824672Abstract: An austenitic stainless steel with a composition comprising: at most 0.15% of C; 2% to 10% of Mn; at most 2% of Ni; at most 4% of Cu; 0.1% to 0.4% of N; 10% to 20% of Cr; at most 1% of Si; at most 3% of Mo; and at most 0.7% of Ti; is used to manufacture equipment, for example furnaces, reactors or ducts, or elements of this equipment, or to coat the internal walls of this equipment, said equipment being used to implement petrochemical processes conducted at temperatures of 350° C. to 1100° C. and in which coke can be formed.Type: GrantFiled: January 15, 2002Date of Patent: November 30, 2004Assignees: Institute Francais du Petrole, USINORInventors: Philippe Lecour, Xavier Longaygue, François Ropital, Laurent Antoni
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Publication number: 20040211702Abstract: Compositions and methods for inhibiting polymerization of ethylenically unsaturated monomers are provided. The compositions include a water-soluble phenylenediamine composition.Type: ApplicationFiled: April 24, 2003Publication date: October 28, 2004Applicant: GENERAL ELECTRIC COMPANYInventors: John Link, Sherif Eldin
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Publication number: 20040200756Abstract: A method for reducing the amount of acid corrosion and products of acid corrosion in an olefin production plant using ethylenediamine.Type: ApplicationFiled: April 10, 2003Publication date: October 14, 2004Inventor: Robert J. Haynal
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Patent number: 6790547Abstract: The present invention provides a process for suppressing the formation of metal-containing coke during processing of a hydrocarbonaceous material, such as for example a hydrocarbon conversion processes. Electromagnetic radiation is applied to the hydrocarbonaceous material while heating the hydrocarbonaceous material to a temperature above 700 degrees F. The frequency of the electromagnetic radiation is preferably below 300 MHz. The process is particularly useful in the reforming of a hydrocarbon material for operation in a fuel cell.Type: GrantFiled: September 27, 2001Date of Patent: September 14, 2004Assignee: Chevron U.S.A. Inc.Inventors: Gunther H. Dieckmann, Michael E. Moir
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Patent number: 6787024Abstract: In an embodiment, the invention relates to a method for mitigating filter fouling from a coker gas oil by decomposing oligomers present in the gas oil.Type: GrantFiled: July 10, 2002Date of Patent: September 7, 2004Assignee: ExxonMobil Research and Engineering CompanyInventors: Michael Siskin, Simon R. Kelemen
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Publication number: 20040147797Abstract: According to the present invention, there is provided a process for inhibiting the polymerization of an aromatic vinyl compound which is capable of efficiently inhibiting the polymerization of an aromatic vinyl compound not only in an initial stage but also over a long term in the stage of producing, purifying, storing or transporting the aromatic vinyl compound, and which is excellent in handling.Type: ApplicationFiled: October 24, 2003Publication date: July 29, 2004Inventors: Seiji Tanizaki, Junichi Nakajima
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Publication number: 20040104146Abstract: 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: ApplicationFiled: November 10, 2003Publication date: June 3, 2004Applicant: Uniroyal Chemical Company, Inc.Inventors: Brigitte Benage, Gerald J. Abruscato, Andrew J. Eisenstein
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Publication number: 20040089586Abstract: 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: ApplicationFiled: November 10, 2003Publication date: May 13, 2004Applicant: Uniroyal Chemical Company, Inc.Inventors: Brigitte Benage, Gerald J. Abruscato, Andrew J. Eisenstein
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Patent number: 6685823Abstract: 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. Also disclosed is a composition of matter comprising: A) an ethylenically unsaturated monomer and B) an effective inhibiting amount, sufficient to prevent premature polymerization during distillation or purification of said ethylenically unsaturated monomer, of at least one inhibitor selected from the group consisting of C-nitrosoaniline and quinone imine oxime compounds used together with an effective amount of oxygen or air to enhance the inhibiting activity of said inhibitor.Type: GrantFiled: January 16, 2002Date of Patent: February 3, 2004Assignee: Uniroyal Chemical Company, Inc.Inventors: Brigitte Benage, Gerald J. Abruscato, Andrew J. Eisenstein
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Patent number: 6652660Abstract: A method for treating compounds which contain reactive sulfur is disclosed, wherein the treatment produces compounds which contain sulfur in a non reactive form. The method is based on the use of an oxidizing compound selected from the group consisting of water soluble inorganic persulfates, water soluble inorganic and organic adducts of hydrogen peroxide and mixtures thereof. The method is particularly useful in preventing stress corrosion cracking of stainless steel and in preventing auto-ignition of pyrophoric iron sulfide.Type: GrantFiled: January 23, 2003Date of Patent: November 25, 2003Assignee: United Laboratories Intl., LLCInventor: Jack G. Frost
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Publication number: 20030205503Abstract: A method for inhibiting and dissolving the deposits formed on caustic or alkaline scrubbers used in scrubbing acidic gases such as carbon dioxide, hydrogen sulfide, which are formed during the pyrolytic cracking of naphtha, ethane, and propane. The cracking operations produce certain oxygenated compounds such as vinyl acetate or acetaldehyde, which undergo polymerization under alkaline condition. The vinyl acetate on hydrolysis releases acetaldehyde under alkaline conditions. Amino acids such as 6 amino caproic acid and lactams such as epsilon caprolactam not only prevent but also dissolve the polymers formed by aldol condensation.Type: ApplicationFiled: April 29, 2002Publication date: November 6, 2003Inventors: Mahesh Subramaniyam, Bankar Prashant
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Patent number: 6623625Abstract: Disclosed is a process for opening naphthenic rings of naphthenic ring-containing compounds, along with catalysts which can be used in that process. The naphthene ring opening catalyst is a catalyst which comprises at least one of a Group VIII metal selected from Ir, Pt, Pd, Rh, and Ru in an amount effective to ring open naphthene rings on naphthene ring-containing compounds, the metal being supported on a substrate comprising at least one Group IB, IIB, and IVA metal in an amount effective to moderate cracking of a naphthene ring-containing feed to form methane.Type: GrantFiled: July 2, 2001Date of Patent: September 23, 2003Assignee: ExxonMobil Research and Engineering CompanyInventors: William C. Baird, Jr., Jingguang G. Chen, Gary B. McVicker
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Patent number: 6602483Abstract: A improved hydrocarbon conversion process, comprising applying a plating, cladding, paint or other coating to at least a portion of a hydrocarbon conversion reactor system which is used to convert hydrocarbons to products in the presence of steam, said coating being effective to reduce the amount of undesirable by-products in said process; and operating the hydrocarbon conversion process at a steam to hydrocarbon ratio that is lower than the steam to hydrocarbon ratio at which said process was operated prior to applying said coating. Preferred hydrocarbon conversion process includes steam cracking of hydrocarbons to produce ethylene and dehydrogenation of ethylbenzene to styrene.Type: GrantFiled: June 21, 2001Date of Patent: August 5, 2003Assignee: Chevron Phillips Chemical Company LPInventors: John V. Heyse, Daniel P. Hagewiesche, Paul M. Spindler
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Patent number: 6596911Abstract: A method and a composition used therein are disclosed for inhibiting formation of hydrocarbon hydrates. The composition comprises an onium compound, an amine salt and, optionally, a solvent.Type: GrantFiled: February 20, 2001Date of Patent: July 22, 2003Assignee: Baker Hughes IncorporationInventors: John L. Przybylinski, Gordon T. Rivers
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Publication number: 20030121823Abstract: A process for substantially decreasing fouling in a refinery unit. The process comprises preheating a feed to said refinery unit reactor zone and thereafter introducing the feed into said refinery unit reactor zone for reaction. The feed is preheated for a time and at a temperature sufficient to cause an effective amount of any polymers and/or oligomers contained in feed to decompose or unzip to substantially reduce fouling in the refinery unit.Type: ApplicationFiled: December 3, 2002Publication date: July 3, 2003Inventors: Michael Siskin, Simon Robert Kelemen
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Patent number: 6585883Abstract: A method for removing or reducing coke deposits in a refinery reactor unit utilizing a reactant gas, preferably steam, and catalyst.Type: GrantFiled: October 10, 2000Date of Patent: July 1, 2003Assignee: ExxonMobil Research and Engineering CompanyInventors: Simon Robert Kelemen, Michael Siskin, Glen Edward Phillips, Nicholas Charles Nahas
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Publication number: 20030109760Abstract: It has been discovered that the polymerization of unsaturated compounds, such as butadiene, may be inhibited by the addition of a diene and/or alkanolamine inhibitor. The inhibitor is believed to catalytically destroy peroxides present, such as hydrogen peroxide, which may be present in trace amounts. Particularly useful inhibitors include, but are not limited to, ethylenediamine (EDA) and monoethanolamine (MEA).Type: ApplicationFiled: January 3, 2003Publication date: June 12, 2003Inventor: Muslim D. Shahid
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Patent number: 6566309Abstract: The invention relates to the use of compounds of the formula (1) in which R1 is C1-C30-alkyl, C2-C30-alkenyl or a group of the formula —CH2—CO—NR2R3 or a C6-C18-aryl radical which may be substituted by a C1-C12-alkyl group, R2, R3 independently of one another, are hydrogen, C1-C6-alkyl or C5-C7-cycloalkyl, or R2 and R3, including the nitrogen atom to which they are bonded, form a ring of 4 to 8 ring atoms, it being possible for the ring also to contain oxygen or nitrogen atoms in addition to carbon atoms, A is a C2-C4-alkylene radical and n is an integer from 1 to 20, as gas hydrate inhibitors.Type: GrantFiled: May 2, 2000Date of Patent: May 20, 2003Assignee: Clariant GmbHInventors: Peter Klug, Michael Feustel
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Patent number: 6482311Abstract: Materials and methods for inhibiting the formation of filamentous coke on heated metal surfaces. Organoselenium compounds, including diarylselenides, diaryldiselenides, alkylarylselenides, and alkylaryldiselenides, are employed as hydrocarbon feedstock additives or as hydrocarbon fuel additives to inhibit filamentous coke formation on hydrocarbon processing systems, including reactors, furnaces, engines and parts thereof and in particular to inhibit filamentous coke formation on heat-exchangers in such systems.Type: GrantFiled: August 1, 2000Date of Patent: November 19, 2002Assignee: TDA Research, Inc.Inventors: David T. Wickham, Jeffrey Engel, Michael E. Karpuk
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Patent number: 6464858Abstract: The incremental yield of hydrocarbons having five or more carbon atoms in a cracked product from a thermal cracking process is increased by contacting or treating the tubes of a thermal cracking furnace with a composition comprising tin and silicon.Type: GrantFiled: August 25, 1994Date of Patent: October 15, 2002Assignee: Phillips Petroleum CompanyInventors: Ronald E. Brown, Larry E. Reed, James P. Degraffenried, Timothy P. Murtha, Gil J. Greenwood, Timothy P. Harper, Mark D. Scharre
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Publication number: 20020139710Abstract: The present invention is directed to the use of hydroxylamine, its acid salts or mixtures thereof to increase carbonyl extraction during the basic washing of hydrocarbons containing oxygenated compounds. More specifically, oxygenated compounds such as carbonyl containing organics are typically an impurity and have a tendency to polymerize, producing fouling elements during processing. The hydroxylamine and its salts are quite effective for increasing the extraction of the carbonyl impurities during the caustic washing of hydrocarbon streams.Type: ApplicationFiled: February 2, 2001Publication date: October 3, 2002Inventors: John F. Martin, Sherif Eldin, Terry Kelly
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Patent number: 6458292Abstract: A composition for an anti-scale-forming agent includes oil-based polyalkylenes, amines phosphorous and oxygen in a polymer for providing dispersivity and anti-oxidation and having the following formula: By integrating both characteristics into a single polymer, the anti-scale-forming agent in accordance with the present invention can be used as an anti-scale-forming agent for a manufacturing process in a petroleum refinery plant or the like chemistry factory. R1, R2 and x are defined herein.Type: GrantFiled: October 12, 2000Date of Patent: October 1, 2002Assignee: Chinese Petroleum Corp.Inventors: Jiang-Jen Lin, Jann-Chen Lin, Wen-Hen L{dot over (o)}, Wen-Shwong Hwang, Kun-Hai Lin
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Patent number: 6454995Abstract: A method of reducing the formation of coke deposits on the heat-transfer surfaces of an ethylene dichloride to vinyl chloride pyrolysis furnace comprising exposing the heat transfer surfaces of said pyrolysis furnace to a phosphine selected from the group consisting of phosphines with the general formula: wherein R1, R2 and R3 are selected from the group consisting of hydrogen, chlorine, alkyl, aryl, alkylaryl and arylalkyl, wherein R1, R2 and R3 can be the same or different.Type: GrantFiled: August 14, 2000Date of Patent: September 24, 2002Assignee: Ondeo Nalco Energy Services, L.P.Inventor: Youdong Tong
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Patent number: 6451892Abstract: A composition for preventing or retarding the formation of gas hydrates during the transport of a fluid comprising water and a hydrocarbon through a conduit. The composition is a homopolymer of vinyl caprolactam, or copolymers thereof, having a low molecular weight in the range of 500 to 2500, which is made in a polymerization solvent, preferably a glycol ether, most preferably 2-butoxyethanol and also including a carrier solvent, preferably monoethylene glycol.Type: GrantFiled: July 13, 1999Date of Patent: September 17, 2002Assignee: ISP Investments Inc.Inventors: Kirill N. Bakeev, Kevin Harris, Carl B. Argo, Michael A. Drzewinski, David E. Graham
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Patent number: 6444852Abstract: A novel amine is provided with improved water dispersibility which is useful to modify the formation of hydrates in streams containing low-boiling hydrocarbons and water.Type: GrantFiled: June 21, 2000Date of Patent: September 3, 2002Assignee: Goldschmidt Chemical CorporationInventors: Charles R. Milburn, Gary M. Sitz
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Patent number: 6436877Abstract: A method of inhibiting or retarding formation of hydrates from water and a lower alkane, such as methane or ethane, involves adding additives which comprise (i) a corrosion inhibitor and (ii) a salt which is of formula [R1(R2)XR3]+Y−, wherein each of R1, R2 and R3 is bonded directly to X, each of R1 and R2, which may be the same or different is an alkyl group of at least 4 carbons, X is S, NR4 or PR4, wherein each of R3 and R4 which may be the same or different represents hydrogen or an organic group, with the proviso that at least one of R3 and R4 is an organic group of at least 4 carbons, and Y is an anion, the additives being added in an amount effective to inhibit or retard hydrate formation, to a medium susceptible to hydrate formation.Type: GrantFiled: April 4, 2000Date of Patent: August 20, 2002Assignee: BP Exploration Operating Co., Ltd.Inventors: Simon Neil Duncum, Christopher George Osborne, Antony Roland Edwards
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Patent number: 6432355Abstract: Described herein is a process of corrosion inhibition of a steel pipeline during transport of water and gas, or water and an oil, or mixtures thereof, therethrough, including introducing a copolymer of vinyl caprolactam and vinylpyridine into said pipeline.Type: GrantFiled: October 12, 1999Date of Patent: August 13, 2002Assignee: ISP Investments Inc.Inventors: Kirill N. Bakeev, Jui-Chang Chuang, Thomas Winkler, Michael A. Drzewinski, David E. Graham
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Patent number: 6417417Abstract: In order to improve the transport of oilfield effluents comprising water, a gas and possibly a liquid hydrocarbon phase under thermodynamic conditions which can lead to the formation of hydrates, a formulation containing at least two additives, one of which behaves as a hydrate crystal nucleation agent, is added to the effluent to be transported.Type: GrantFiled: April 28, 2000Date of Patent: July 9, 2002Assignee: Institut Francais du PetroleInventors: Anne Sinquin, Marie Velly, Béatrice Cingotti, Jean-Pierre Durand
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Publication number: 20020084210Abstract: A method of inhibiting and/or removing deposits from coke oven gas handling equipment is disclosed which comprises the addition of a treatment combination of a heterocyclic nitrogenous compound such as quinoline and 2-butoxyethanol to the flushing liquor used to cool coke oven effluent gases.Type: ApplicationFiled: January 30, 2002Publication date: July 4, 2002Applicant: BetzDearborn Inc.Inventors: Patrick J. Doyle, Terrence W. Mattioli, Gary S. Thundercliffe
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Patent number: 6409887Abstract: A monomer composition, stabilized against premature polymerization, comprising: a) an ethylenically unsaturated monomer or mixture of monomers polymerizable by free radical initiation, and b) an effective amount, sufficient to inhibit premature polymerization of component (a) of a mixture of: i) 1 to 99% by weight, based on the total weight of components (i) and (ii), of a mixture of at least one aromatic amine and at least one organic acid in a molar ratio of 10:1 to 1:10, and ii) 99 to 1% by weight, based on the total weight of components (i) and (ii), of at least one stable radical compound.Type: GrantFiled: April 13, 2001Date of Patent: June 25, 2002Assignee: AAH Marks and Company LimitedInventors: Anthony Pryce, Robert Charles Callin
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Patent number: 6406613Abstract: A method for mitigating the condensation of liquid hydrocarbons and subsequent coke deposition in refinery reactor units by dew point suppression.Type: GrantFiled: October 10, 2000Date of Patent: June 18, 2002Assignee: ExxonMobil Research and Engineering Co.Inventors: Nicholas Charles Nahas, Dean Clise Draemel, Richard Edwards Walter, Michael Siskin, Glen Edward Phillips
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Patent number: 6388155Abstract: The fouling in a styrene production process involving the dehydrogenation of ethylbenzene is reduced by removing polymerizable components of the gaseous dehydrogenation effluent prior to the condensation of the effluent in the main condenser system. This involves the scrubbing of the gaseous effluent with organic condensate from the main condenser system to remove styrene, divinylbenzene and other polymer precursors which may be present and sometimes some of the ethylbenzene. The scrubber may include a reboiler and stripping section and function as a full fractionator thereby reducing the need for downstream distillation.Type: GrantFiled: August 1, 2000Date of Patent: May 14, 2002Assignee: ABB Lummus Global Inc.Inventors: Angel S. Sy, Gautam M. Phanse
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Patent number: 6380451Abstract: The specification discloses a method for cleaning an oligomerization reactor after making a higher olefin in the reactor. An olefin is reacted in the presence of a catalyst comprising an aluminum alkyl to form an olefin reaction product. For example, ethylene can be trimerized in the reaction to produce 1-hexene. The reaction also causes a co-product residue of the catalyst to form on the interior surface of the reactor. The interior surface of the reactor is then contacted with an alcohol under conditions effective to remove at least a substantial amount of the catalyst residue from the interior surface of the reactor. The catalyst-removing step can be carried out by combining an alcohol with the process medium used in the reactor. The combined medium can be used to remove both the accumulated polymer co-product and the accumulated catalyst residue from the reactor.Type: GrantFiled: December 29, 1999Date of Patent: April 30, 2002Assignee: Phillips Petroleum CompanyInventors: Bruce E. Kreischer, Warren M. Ewert, Ronald D. Knudsen
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Publication number: 20020045076Abstract: The present invention provides a process for suppressing the formation of metal-containing coke during processing of a hydrocarbonaceous material, such as for example a hydrocarbon conversion processes. Electromagnetic radiation is applied to the hydrocarbonaceous material while heating the hydrocarbonaceous material to a temperature above 700 degrees F. The frequency of the electromagnetic radiation is preferably below 300 MHz. The process is particularly useful in the reforming of a hydrocarbon material for operation in a fuel cell.Type: ApplicationFiled: September 27, 2001Publication date: April 18, 2002Inventors: Gunther Dieckmann, Michael Moir
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Patent number: 6372121Abstract: This invention is a method to inhibit the polymerization of carbonyl compounds in a basic wash unit operation in a hydrocarbon cracking process, wherein a compound selected from the group consisting of alpha-amino acids and esters thereof and amides thereof and salts thereof and mixtures thereof or Mercaptoacetic acid and alkyl esters thereof, is added either to a stream comprising a carbonyl compound or to the basic wash unit operation; wherein the compound is selected such that it remains water-soluble and base-soluble and does not flocculate in the stream or in the basic wash unit operation; and wherein the stream is contacted with the compound either before or at the same time as the stream enters the basic wash unit operation; or wherein the compound is added to the basic wash unit operation before or while the stream enters the basic wash unit operation.Type: GrantFiled: October 31, 2000Date of Patent: April 16, 2002Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventors: Robert D. McClain, Natu R. Patel, Raymond M. Glath
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Patent number: 6368494Abstract: A method of reducing the formation of coke deposits on the heat-transfer surfaces of an ethylene dichloride to vinyl chloride pyrolysis furnace comprising exposing the heat transfer surfaces of said pyrolysis furnace to a phosphite selected from the group consisting of phosphites with the general formula: wherein A1, A2 and A3 are selected from the group consisting of —OR1, —SR2 and Cl, wherein R1 and R2 are selected from the group consisting of alkyl, aryl, alkylaryl and arylalkyl, wherein A1, A2 and A3 may be the same or different, provided that at least one of A1, A2, and A3 is not Cl.Type: GrantFiled: August 14, 2000Date of Patent: April 9, 2002Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventor: Youdong Tong
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Patent number: 6359047Abstract: A gas hydrate inhibitor includes, by weight, a copolymer including about 80 to about 95% of polyvinyl caprolactam (VCL) and about 5 to about 20% of N,N-dialkylaminoethyl(meth)acrylate or N-(3-dimethylaminopropyl) methacrylamide.Type: GrantFiled: March 20, 2001Date of Patent: March 19, 2002Assignee: ISP Investments Inc.Inventors: Vu Thieu, Kirill N. Bakeev, Jenn S. Shih
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Publication number: 20010052481Abstract: Popcorn polymer growth is inhibited in unstabilized materials comprising olefinically unsaturated organic compounds by adding thereto an effective amount of an aliphatic alcohol of the formula IType: ApplicationFiled: March 2, 1999Publication date: December 20, 2001Inventors: MAIK ARON, MICHAEL BACHTLER, JURGEN KANAND
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Patent number: 6331508Abstract: A method for controlling the formation of gas hydrate crystals in a fluid mixture by admixing with said fluid mixture a polyoxyalkylenediamine in an amount effective to prevent and/or inhibit crystal growth.Type: GrantFiled: February 2, 1998Date of Patent: December 18, 2001Assignee: BJ Service Company, U.S.A.Inventor: Marek K. Pakulski
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Patent number: 6313367Abstract: It has been discovered that various ester and ether reaction products are excellent asphaltene deposition inhibitors or dispersants for use in hydrocarbons such as crude oils. The asphaltene inhibiting compounds may be (1) esters formed from the reaction of polyhydric alcohols with carboxylic acids; (2) ethers formed from the reaction of glycidyl ethers or epoxides with polyhydric alcohols; and (3) esters formed from the reaction of glycidyl ethers or epoxides with carboxylic acids.Type: GrantFiled: January 25, 2000Date of Patent: November 6, 2001Assignee: Baker Hughes IncorporatedInventor: Patrick J. Breen
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Patent number: 6281274Abstract: A composition for preventing or retarding the formation of gas hydrates during the transport of a fluid comprising water and a hydrocarbon through a conduit. The composition is a copolymer of vinyl caprolactam and vinyl pyridine, and terpolymers thereof, with vinyl pyrrolidone, preferably including 70-97% by weight vinyl caprolactam. Suitably such polymers have a molecular weight in the range of 500 to 2500, and are made in a polymerization solvent, preferably a glycol ether, most preferably, 2-butoxyethanol; and also including a carrier solvent, preferably monoethylene glycol.Type: GrantFiled: October 12, 1999Date of Patent: August 28, 2001Assignee: ISP Investments Inc.Inventors: Kirill N. Bakeev, Jui-Chang Chuang, Thomas Winkler, Michael A. Drzewinski, David E. Graham
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Publication number: 20010009968Abstract: Methods and compositions for inhibiting the polymerization of ethylenically unsaturated hydrocarbons are disclosed. Combinations of aminophenol compound and either of phenylenediamine or hydroxylamine compounds are effective at inhibiting this polymerization under both processing and storage conditions.Type: ApplicationFiled: January 24, 2001Publication date: July 26, 2001Applicant: BETZDEARBORN INC.Inventor: Sherif Eldin
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Patent number: 6251836Abstract: A hydrate inhibitor comprising a blend of an additive (i) and at least one of an additive (ii) and an additive (iii) wherein additive (i) is a polymer of an ethylenically unsaturated N-heterocyclic carbonyl compound, with 6-8 ring atoms in the heterocyclic ring, additive (ii) is a corrosion inhibitor and additive (iii) is a salt of formula (I):[R1(R2)XR3]+Y− 1/v, I wherein each of R1, R2 and R3 is bonded directly to X, each of R1 and R2, which may be the same or different is an alkyl group of at least 4 carbons, X is S, NR4 or PR4, wherein each of R3 and R4 which may be the same or different represents hydrogen or an organic group, with the proviso that at least one of R3 and R4 is an organic group of at least 4 carbons, especially at least 5 carbons, and Y is an anion of valency v, wherein v is an integer of 1-4.Type: GrantFiled: November 18, 1997Date of Patent: June 26, 2001Assignee: BP Exploration Operating Company LimitedInventors: Simon Neil Duncum, Antony Roland Edwards, Keith James, Christopher George Osborne
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Patent number: 6245955Abstract: There is provided a method to separate sub-sea and/or liquid hydrocarbons from the commingled stream of gas, water, oil, and or hydrocarbon condensate produced from subterranean wells comprising collecting a subterranean well product from at least one subterranean well, wherein said subterranean well product comprises hydrocarbon liquid, gas and water; forcing the water and gas to form hydrates; and separating the hydrates from the hydrocarbon liquid.Type: GrantFiled: August 31, 1999Date of Patent: June 12, 2001Assignee: Shell Oil CompanyInventor: David Randolph Smith
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Patent number: 6242518Abstract: A composition for preventing or retarding the formation of gas hydrates during the transport of a fluid comprising water and a hydrocarbon through a conduit. The composition is a homopolymer of vinyl caprolactam, or copolymers thereof, having a low molecular weight in the range of 500 to 4000, which is made by polymerization of the monomer or monomers in a polymerization solvent which is a mixture of a glycol ether and water, preferably 2-butoxyethanol and water, at a pH of about 8-12.Type: GrantFiled: April 21, 2000Date of Patent: June 5, 2001Assignee: ISP Investments Inc.Inventors: Kirill N. Bakeev, Randall Myers, Jui-Chang Chuang, Thomas Winkler, Allen Krauss
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Patent number: 6232273Abstract: Disclosed herein are clathrate hydrate inhibitors and the method of inhibiting the formation, agglomeration, and deposition of clathrate hydrate using the inhibitors. The clathrate hydrate inhibitor comprises a macromolecular compound in which 3-15 membered ring pendant is connected to the polymer main chain via a specific spacer group such as homo- or co-polymer of (meth)acryloyl pyrrolidine, pyrrolidinocarbonylethyl (meth)acrylate, 2-oxo-pyrrolidino-ethyl (meth)acrylate, glyoxyloyl pyrrolidine, pyrrolidinocarbonyl aspartate.Type: GrantFiled: May 7, 1998Date of Patent: May 15, 2001Assignee: Nippon Shokubai Co., Ltd.Inventors: Takashi Namba, Yoshikazu Fujii, Takuya Saeki, Hiyora Kobayashi
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Patent number: 6228253Abstract: A method and apparatus for decoking and suppressing coke formation during pyrolysis has been discovered that does not require complete shut down of the pyrolysis furnace. For the decoking step, the hydrocarbon feed is cut off to one or more coils for usually less than about three hours during which a decoking additive is added to the steam flow in that coil. This additive is comprised of an aqueous solution of a group IA metal salt and a group IIA metal salt and catalyzes the coke removal. The hydrocarbon feed continues in the other coils during this procedure. After decoking, a suppression additive also comprising group IA and IIA metals is added to the steam and hydrocarbon feed. This suppression additive will melt onto the inner surfaces of the pyrolysis furnace coils, coating the coils with a glass layer which inhibits coke formation.Type: GrantFiled: September 17, 1998Date of Patent: May 8, 2001Inventor: Zalman Gandman
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Patent number: 6200460Abstract: Substance mixtures comprising (A) vinyl-containing compounds, (B) an active amount of a mixture inhibiting the premature polymerization of the vinyl-containing compounds, comprising (i) at least one N-oxyl compound of a secondary amine which carries no hydrogen atoms on the &agr;-C atoms, and (ii) at least one iron compound, (C) if appropriate nitro compounds, and (D) if appropriate costabilizers, a process for inhibiting the premature polymerization of vinyl-containing compounds (A) and the use of mixture (B), if appropriate as a mixture with nitro compounds (C) and/or costabilizers (D), for inhibiting the premature polymerization of free radical polymerizable compounds and for stabilizing organic materials against the damaging action of free radicals.Type: GrantFiled: December 16, 1998Date of Patent: March 13, 2001Assignee: BASF AktiengesellschaftInventors: Heinz Friedrich Sutoris, Hermann Uhr, Konrad Mitulla, Jürgen Schröder, Roland Merger, Knut Kessel
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Patent number: RE38532Abstract: Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur.Type: GrantFiled: December 6, 1999Date of Patent: June 8, 2004Assignee: Chevron Phillips Chemical Company LPInventors: John V. Heyse, Bernard F. Mulaskey, Robert A. Innes, Daniel P. Hagewiesche, William J. Cannella, David C. Kramer