And N Containing Patents (Class 585/4)
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Patent number: 6835288Abstract: A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically unsaturated compounds, wherein (i) an electronic signal which correlates with the concentration of the N-oxyl radicals in the mixture is obtained periodically or continuously, (ii) the electronic signal is compared with a reference value, and (iii) addition of a stabilizer to the mixture is controlled according to the comparison (ii). The signal is preferably obtained by ESR measurement. The process permits efficient use of the stabilizer.Type: GrantFiled: December 11, 2001Date of Patent: December 28, 2004Assignee: BASF AktiengesellschaftInventors: Heinz Friedrich Sutoris, Konrad Mitulla
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Patent number: 6833484Abstract: The present invention relates blended hydrocarbonaceous products comprising Fischer Tropsch derived products that resist oxidation and to methods of inhibiting oxidation in Fischer Tropsch products. The present invention also relates to Fischer Tropsch products containing an effective amount of a petroleum-derived hydrocarbonaceous product such that the Fischer Tropsch product resists oxidation.Type: GrantFiled: June 15, 2001Date of Patent: December 21, 2004Assignee: Chevron U.S.A. Inc.Inventor: Dennis J. O'Rear
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Publication number: 20040248307Abstract: System (50) for marking a fluid by a marker, the fluid flowing from a source to a destination, the system including a sensor (58) for determining a value of a fluid property and a fluid flow controller (54) for admitting a selected amount of the marker to the fluid, wherein the selected amount is determined according to the fluid value and a predetermined concentration of the marker in the fluid in the destination.Type: ApplicationFiled: March 8, 2004Publication date: December 9, 2004Inventors: Yair Grof, Moshe Sosehin, Uziel Ben-itzhak
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Patent number: 6761833Abstract: Vinyl monomers are stabilized by a composition which includes an alkyl hydroxyl amine and a sulfide compound or at least two alkyl hydroxyl amines and a phenolic compound.Type: GrantFiled: February 4, 2002Date of Patent: July 13, 2004Assignee: Atofina Chemicals, Inc.Inventors: Jianfeng Lou, Martin Nosowitz
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Patent number: 6717021Abstract: A solvating component for a solvated mesophase pitch. The solvated component includes a mixture of aromatic hydrocarbons having boiling points in the atmospheric equivalent boiling point range of about 285° to about 500° C. (about 550° F.-932° F.). At least 80% of the carbon atoms of the hydrocarbons are aromatic as characterized by carbon 13 NMR. The aromatic hydrocarbons are selected from a group consisting of aromatic compounds having 2 to 5 aromatic rings, substituted aromatic compounds having 2 to 5 aromatic rings wherein said substituents are alkyl groups having 1 to 3 carbons, hydroaromatic compounds having 2 to 5 rings, substituted aromatic compounds having 2 to 5 rings wherein said substituents are alkyl groups having 1 to 3 carbons, and mixtures thereof.Type: GrantFiled: June 4, 2001Date of Patent: April 6, 2004Assignee: ConocoPhillips CompanyInventors: H. Ernest Romine, John A. Rodgers, W. Mark Southard, Edward J. Nanni
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Publication number: 20040010169Abstract: A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon a pyrazinoporphyrazine dye having an absorption maximum from 700 nm to 900 nm.Type: ApplicationFiled: June 19, 2003Publication date: January 15, 2004Inventors: Rajiv Manohar Banavali, Kim Sang Ho
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Patent number: 6660181Abstract: A method is disclosed for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers a polymerization inhibiting amount of a mixture comprising A) a first inhibitor comprising 4-amino-2,2,6,6-tetramethylpiperidinyloxy, wherein said amino group is a primary, secondary, or tertiary amino group; and B) at least one other inhibitor having the structural formula: wherein: R1 and R4 are independently selected from the group consisting of hydrogen, alkyl, and heteroatom-substituted alkyl; R2 and R3 are independently selected from the group consisting of alkyl and heteroatom-substituted alkyl; X1 and X2 (1) are independently selected alkyl groups of 1 to 15 carbon atoms or (2) taken together, form a ring structure with the nitrogen.Type: GrantFiled: July 12, 2002Date of Patent: December 9, 2003Assignee: Crompton CorporationInventors: Brigitte Benage, Angela M. Edwards, Vilen Kosover, Gan Wang, Anthony Gentile, Jesus R. Fabian, Gerald J. Abruscato
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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: 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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Patent number: 6579442Abstract: Methods and compositions for inhibiting the polymerization of vinyl monomers are disclosed. Combinations of nitroxyl compounds and aliphatic amines are effective at inhibiting the polymerization of vinyl monomers under both processing and storage conditions.Type: GrantFiled: May 22, 2001Date of Patent: June 17, 2003Assignee: GE Betz, Inc.Inventor: Sherif Eldin
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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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Publication number: 20030071148Abstract: A fuel injector (1), especially for the direct injection of fuel into the combustion chamber of a mixture-compressing internal combustion engine having externally supplied ignition, comprising a swirl disk (35) having swirl channels (36) and a central recess (38), and having a guide compensator (41) inserted into the recess (38) whose center axis is able to be inclined relative to the center axis of the fuel injector (1) and which has a sealing fit with respect to the valve needle (3). Formed by a sealing-seat surface (39), disposed in the swirl disk (35), and a radial widening (40) of the guide compensator (41) is a sealing seat which tolerates an excursion of the center axis, preventing a swirl-free leakage flow in the same manner as the sealing fit between the valve needle (3) and the guide compensator (41).Type: ApplicationFiled: October 11, 2002Publication date: April 17, 2003Inventor: Guenther Hohl
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Patent number: 6545156Abstract: Oligomeric compounds and methods of making the compounds having the formula: T&Parenopenst;M—F&Parenclosest;i&Parenopenst;M—F′&Parenclosest;jM (III) wherein i and j are integers from about 0 to 300 and the sum of i and j is greater than 2, wherein the units F, F′ and T are derived from one or more multi-functional carbonyl compounds of general structure DO—CO—CRaRb—(—CRcRd—)n—NH—(Y)m—CO—OD (IV) wherein n is an integer from 1 to 15, m is either 0 or 1; Ra, Rb, Rc, and Rd, are each a hydrogen or a hydrocarbyl group; Y is CO—(CReRf)p, wherein Re and Rf are each a hydrogen or hydrocarbyl group and p is zero or an integer from 1 to 20 or CO—C6H4—, D is a hydrocarbyl group, and M is a moiety derived from one or more diamino or dihydroxy compounds that contain a 4-aminopiperidine radical.Type: GrantFiled: November 3, 2000Date of Patent: April 8, 2003Assignee: Cytec Technology Corp.Inventors: Thomas Patrick Sassi, Ram Baboo Gupta
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Publication number: 20030010676Abstract: Methods and compositions for inhibiting the polymerization of vinyl monomers are disclosed. Combinations of nitroxyl compounds and aliphatic amines are effective at inhibiting the polymerization of vinyl monomers under both processing and storage conditions.Type: ApplicationFiled: May 22, 2001Publication date: January 16, 2003Inventor: Sherif Eldin
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Patent number: 6506806Abstract: A composition for reducing surface tension comprising from about 0.1% to about 0.5% by weight of a hydrocarbon surfactant and from 0.0001% to about 0.3% by weight of a fluorocarbon surfactant, provided that the hydrocarbon surfactant is present at less than or equal to 0.08% by weight when the fluorocarbon surfactant is present at greater than or equal to 0.Type: GrantFiled: May 15, 2001Date of Patent: January 14, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Charles Kenneth Taylor, Kai Volker Schubert, Richard David Koehler
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Publication number: 20020193646Abstract: The present invention relates blended hydrocarbonaceous products comprising Fischer Tropsch derived products that resist oxidation and to methods of inhibiting oxidation in Fischer Tropsch products. The present invention also relates to Fischer Tropsch products containing an effective amount of a petroleum-derived hydrocarbonaceous product such that the Fischer Tropsch product resists oxidation.Type: ApplicationFiled: June 15, 2001Publication date: December 19, 2002Inventor: Dennis J. O'rear
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Publication number: 20020193645Abstract: The present invention relates to the use of antioxidants in Fischer Tropsch derived products. The antioxidants of the present invention are preferably temporary antioxidants that may be removed after the period in which oxidation is expected by techniques such as simple distillation. The temporary antioxidants of the present invention are typically sulfur-containing compounds generated from sweetening light hydrocarbon streams.Type: ApplicationFiled: June 15, 2001Publication date: December 19, 2002Inventor: Dennis J. O'Rear
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Patent number: 6475348Abstract: A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component (b1), one or more sparingly volatile nitroxyl compounds as component (b2), if required one or more aromatic nitro compounds as component (b3) and, if required, one or more iron compounds as component (b4). Stabilizers (B) contain the components (b1) and (b2), (b1) and (b2) and (b3), (b1) and (b2) and (b4), and (b1), (b2), (b3) and (b4), and the premature polymerization of vinyl-containing compounds during their purification or distillation is inhibited by a process in which a stabilizer (B) is added or the components of stabilizer (B) are added as individual substances or in at least two groups of the components.Type: GrantFiled: December 17, 1999Date of Patent: November 5, 2002Assignee: BASF AktiengesellschaftInventors: Heinz Friedrich Sutoris, Konrad Mitulla, Jacques Dupuis, Claus Kaliba
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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: 6395943Abstract: A process is disclosed for inhibiting the polymerization of vinyl aromatic compounds, such as styrene, during its distillation. The process involves adding a mixture of at least two inhibitors to the vinyl aromatic compound. One such combination is N,N′-di-2-butyl-N,N′,4-dinitroso-1,4-diaminobenzene and dinitrocresol. A stabilizer such as N,N′-di-2-butyl-1,4-diaminobenzene can also be added.Type: GrantFiled: August 10, 1999Date of Patent: May 28, 2002Assignee: UOP LLCInventors: Paul R. Kurek, Robert R. Frame
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Patent number: 6395942Abstract: Compounds that inhibit polymerization of vinyl aromatic compounds need to operate at temperatures of about 90° C. to about 150° C. A process for increasing the thermal stability of inhibitors such as N,N′-di-2-butyl-N,N′-dinitroso-1,4-diaminobenzene is disclosed. The process comprises adding to the inhibitor a stabilizer such as N,N′-di-2-butyl-1,4-diaminobenzene. The mixture of inhibitor and stabilizer is also used to inhibit polymerization of vinyl aromatic compounds.Type: GrantFiled: August 10, 1999Date of Patent: May 28, 2002Assignee: UOP LLCInventors: Paul R. Kurek, Robert R. Frame
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Patent number: 6379588Abstract: A monomer composition, which contains A) vinyl-containing monomers in which a heteroatom selected from the group consisting of the halogens, nitrogen, oxygen, sulfur and silicon is present on the vinyl group, and B) a compound or a mixture of compounds of the formula II where R4 is methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl, sec-butyl, tert-butyl or trimethylsilyl.Type: GrantFiled: March 23, 1999Date of Patent: April 30, 2002Assignee: BASF AktiengesellschaftInventors: Heinz Friedrich Sutoris, Andreas Koch, Alexander Aumüller, Jacques Dupuis, Manfred Niessner
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Publication number: 20020038063Abstract: 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: ApplicationFiled: February 20, 2001Publication date: March 28, 2002Inventors: John L. Przybylinski, Gordon T. Rivers
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Publication number: 20020011427Abstract: A solvating component for a solvated mesophase pitch. The solvated component includes a mixture of aromatic hydrocarbons having boiling points in the atmospheric equivalent boiling point range of about 285° to about 460° C. (about 550° F.-932° F.). At least 80% of the carbon atoms of the hydrocarbons are aromatic as characterized by carbon 13 NMR. The aromatic hydrocarbons are selected from a group consisting of aromatic compounds having 2 to 5 aromatic rings, substituted aromatic compounds having 2 to 5 aromatic rings wherein said substituents are alkyl groups having 1 to 3 carbons, hydroaromatic compounds having 2 to 5 rings, substituted aromatic compounds having 2 to 5 rings wherein said substituents are alkyl groups having 1 to 3 carbons, and mixtures thereof.Type: ApplicationFiled: June 4, 2001Publication date: January 31, 2002Inventors: H. Ernest Romine, John A. Rodgers, W. Mark Southard, Edward J. Nanni
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Patent number: 6342647Abstract: It has been discovered that the polymerization of vinyl aromatic compounds, such as styrene, may be inhibited by the addition of a composition that contains a hindered hydroxylamine, and, optionally, a synergist together with the hindered hydroxylamine.Type: GrantFiled: September 8, 1999Date of Patent: January 29, 2002Assignee: Baker Hughes IncorporatedInventors: Glenn L. Roof, Muslim D. Shahid
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Patent number: 6342648Abstract: The present invention provides compositions and methods inhibiting polymerization of vinyl aromatic compounds comprising a bisphenol compound and an oxidized p-phenylenediamine. In a specific, non-limiting embodiment, the polymerization of the vinyl aromatic compound styrene is inhibited by a composition comprising the bisphenol compound 4,4′-methylenebis(2,6-di-tert-butyphenol) and the oxidized p-phenylenediamine compound N-phenyl-N′-methyl-benzoquinonediimide.Type: GrantFiled: September 30, 1999Date of Patent: January 29, 2002Assignee: Baker Hughes IncorporatedInventor: Muslim D. Shahid
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Patent number: 6339051Abstract: Diesel engine cylinder oils of improved cleanliness and load carrying ability and reduced port deposit characteristics for use in marine and stationary slow speed diesel engines are based on medium heavy Group I or Group II neutral base oils, typically from 300 to 500 SUS using a liquid, oil-miscible polyisobutylene (PIB) in combination with the neutral base stock and an additive package comprising a detergent component or components, an antioxidant, an antiwear agent, and a dispersant. The detergent component preferably comprises one or more overbased phenates, phenylates, salicylates or sulfonates in order to confer the desired alkalinity characteristics on the finished oil. The oils are produced in the viscosity range of 15 to 25 cS (100° C.), usually with a nominal viscosity of 20 or 24 cS, i.e., from 18.5 to 21.9 cS or 21.9 to 26.1 cS (100° C.). The viscosity index of the improved oils is at least 95, typically from 105 to 120. Total Base Number of the oils is in the range 40 to 100.Type: GrantFiled: June 11, 1998Date of Patent: January 15, 2002Assignee: Mobil Oil CorporationInventors: Vincent M. Carey, John T. Fogarty
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Patent number: 6284936Abstract: It has been discovered that the polymerization of vinyl aromatic compounds, such as styrene, may be inhibited by the addition of a composition that contains an alkyl-dihydroxyarene, a hydrogen transfer agent, and a stable nitroxide. In another, preferred embodiment of the invention, these three components are blended in an organic amine.Type: GrantFiled: December 21, 2000Date of Patent: September 4, 2001Assignee: Baker Hughes IncorporatedInventor: Muslim D. Shahid
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Patent number: 6262323Abstract: It has been discovered that the polymerization of diene compounds, such as isoprene, may be inhibited by the addition of a composition that contains a at least one phenylenediamine, at least one sterically hindered phenol, and at least one hydroxylamine. This three-component composition exhibits synergistically improved results over the use of the components individually or in paired combinations. In one preferred embodiment, the polymerization inhibiting composition includes phenylenediamine (PDA), butylated hydroxytoluene (BHT), and N,N′-diethylhydroxylamine (DEHA).Type: GrantFiled: December 14, 1999Date of Patent: July 17, 2001Assignee: Baker Hughes IncorporatedInventor: Sherri Elder
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Patent number: 6231662Abstract: An additive for enhancing the performance of industrial pigments. The additive improves dispersibility and is the reaction product of an amine, a fatty amine, and a polybasic acid.Type: GrantFiled: October 25, 1999Date of Patent: May 15, 2001Inventor: George K. Atkinson
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Patent number: 6204420Abstract: The invention relates to a synergistic mixture of A from 5 to 99% by weight of a carboxylic acid having more than 4 carbon atoms, an ethercarboxylic acid containing C18-C22-alkyl, C18-C22-alkenyl or C6-C18-alkylaryl substituents, an amidocarboxylic acid, or mixtures thereof, B from 1 to 95% by weight of a phosphoric mono- or diester, or mixtures thereof, which is substituted by C18-C22-alkyl, C18-C22-alkenyl, C6-C18-alkylaryl or alkoxylated groups, where the sum of components A and B is 100% by weight, to crude oils containing such mixtures, and to a process for dispersing asphaltenes in crude oils.Type: GrantFiled: June 24, 1999Date of Patent: March 20, 2001Assignee: Clariant GmbHInventors: Dennis Miller, Axel Vollmer, Michael Feustel, Peter Klug
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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: 6143205Abstract: Mixtures contain(A) vinyl-containing monomers, and(B) an effective amount of a mixture inhibiting the premature polymerization of the vinyl-containing monomers during the purification or distillation and containing(i) from 0.05 to 4.5% by weight, based on the total mixture (B), of at least one N-oxyl compound of a secondary amine which carries no hydrogen atoms on the .alpha.-carbon atoms and(ii)from 99.95 to 95.5% by weight, based on the total mixture (B), of at least one nitro compound,and a mixture (B) is used for inhibiting the premature polymerization of monomers.Type: GrantFiled: August 3, 1998Date of Patent: November 7, 2000Assignee: BASF AktiengesellschaftInventors: Heinz Friedrich Sutoris, Alexander Aumuller, Hermann Uhr
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Patent number: 6024894Abstract: Synergistic composition and method of use are disclosed. The compositions comprise a quinone methide derivative and a hydroxylamine compound. These compositions demonstrate synergism at inhibiting the polymerization of a vinyl aromatic monomer. Preferably the quinone methide derivative is 2,6-di-tert-butyl-4-benzylidene-cyclo-2,5-dienone and the hydroxylamine compound is N,N-bis(hydroxypropyl)hydroxylamine.Type: GrantFiled: March 25, 1998Date of Patent: February 15, 2000Assignee: BetzDearborn Inc.Inventor: Graciela B. Arhancet
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Patent number: 6004361Abstract: A low emission diesel fuel suitable for use in underground diesel-engined mining equipment comprises a straight run distillate fuel having an end point not greater than 300.degree. C. (about 660.degree. F.), a cetane number in the range of 55 to 60 a specific gravity not greater than 0.83 a sulfur content not greater than 0.1 wt percent and an aromatics content of 18 to 30 wt. percent. The T.sub.90 of the fuels is typically in the range of 255.degree. to 270.degree. C. (about 490.degree. F. to 525.degree. F.), with an initial boiling points typically in the range of 170.degree. to 190.degree. C. (about 340.degree. to 374.degree. F.). Ten percent points (T.sub.10) are typically in the range from about 200.degree. to 220.degree. C. (about 390.degree. to 430.degree. F.). The API gravity of the fuel is at least 38 and is typically in the range of 38 to 42 and the specific gravity is typically in the range of 0.82 to 0.83.Type: GrantFiled: February 26, 1999Date of Patent: December 21, 1999Assignee: Mobil Oil CorporationInventors: Edward G. Barry, John N. Bennett, Dale B. Heck, Peter Heinze
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Patent number: 5990327Abstract: Use of aminotriarylmethanes of the formula ##STR1## where the ring A may be benzofused, andR.sup.1 and R.sup.2 are each substituted or unsubstituted C.sub.1 -C.sub.13 -alkyl or substituted or unsubstituted phenyl, or R.sup.1 and R.sup.2 are together with the nitrogen atom joining them together a heterocyclic radical, or else R.sup.1 is hydrogen,R.sup.3 and R.sup.4 are substituted or unsubstituted C.sub.1 -C.sub.20 -alkyl or else R.sup.3 is hydrogen, andX.sup.1 and X.sup.2 are each substituted or unsubstituted C.sub.1 -C.sub.13 -alkyl or a radical of the formula NR.sup.1 R.sup.2, or else one of X.sup.1 and X.sup.2 is hydrogen,for marking hydrocarbons, hydrocarbons comprising the abovementioned aminotriarylmethanes, a method for detecting the aminotriarylmethanes in hydrocarbons, and novel aminotriarylmethanes.Type: GrantFiled: November 30, 1995Date of Patent: November 23, 1999Assignee: BASF AktiengesellschaftInventors: Ulrike Schloesser, Karin Heidrun Beck
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Patent number: 5976201Abstract: A low emission diesel fuel suitable for use in underground diesel-engined mining equipment comprises a straight run distillate fuel having an end point not greater than 300.degree. C. (about 660.degree. F.), a cetane number in the range of 55 to 60 a specific gravity not greater than 0.83 a sulfur content not greater than 0.1 wt percent and an aromatics content of 18 to 30 wt. percent. The T.sub.90 of the fuels is typically in the range of 255.degree. to 270.degree. C. (about 490.degree. F. to 525.degree. F.), with an initial boiling points typically in the range of 170.degree. to 190.degree. C. (about 340.degree. to 374.degree. F). Ten percent points (T.sub.10) are typically in the range from about 200.degree. to 220.degree. C. (about 390.degree. to 430.degree. F.). The API gravity of the fuel is at least 38 and is typically in the range of 38 to 42 and the specific gravity is typically in the range of 0.82 to 0.83.Type: GrantFiled: October 28, 1996Date of Patent: November 2, 1999Assignee: Mobil Oil CorporationInventors: Edward G. Barry, John N. Bennett, Dale B. Heck, Peter Heinze
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Patent number: 5910232Abstract: Inhibition performance is improved in styrene processing through the addition of a stable nitroxide free radical compound to the styrene feed and to the reflux of at least one column.Type: GrantFiled: June 10, 1998Date of Patent: June 8, 1999Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventors: Zara Hyde, Vincent E. Lewis
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Patent number: 5869717Abstract: Applicants have developed a process for inhibiting the polymerization of vinyl aromatic compound during the distillation of the vinyl aromatic compounds. The process involves adding to the vinyl aromatic compound, e.g., styrene, a nitroso compound such as N-nitroso-N, N'-di-3-pentyl-p-phenylenediamine.Type: GrantFiled: September 17, 1997Date of Patent: February 9, 1999Assignee: UOP LLCInventors: Robert R. Frame, Paul R. Kurek
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Patent number: 5841010Abstract: This invention is directed toward a method for inhibiting the formation (nucleation, growth and agglomeration) of clathrate hydrates. The method comprises adding into a mixture comprising hydrate forming substituents and water, an effective amount of a hydrate inhibitor selected from the group consisting of anionic, cationic, non-ionic and zwitterionic hydrate inhibitors. The hydrate inhibitor has a polar head group and a nonpolar tail group not exceeding 12 carbon atoms in the longest carbon chain.Type: GrantFiled: June 2, 1995Date of Patent: November 24, 1998Assignee: Exxon Production Research CompanyInventors: Manese Rabeony, Dennis George Peiffer, Christine Ann Costello, Pamela Jean Wright, Karla Schall Colle, Larry Dalton Talley
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Patent number: 5824829Abstract: An inhibitor to suppress or inhibit the viscosity increase of a hydrocarbon, e.g. in a bottom section of an oil quench tower, featuring the use of a sulfonic acid and/or its salt as an effective inhibitor composition, which may optionally contain a polymerization inhibitor including one or more inhibitors selected from the group of aromatic amines, phenols and dialkyl hydroxyl amines. Furthermore, the method to inhibit the increasing viscosity of hydrocarbon, e.g. in a bottom section of a tower, may be accomplished by adding the hydrocarbon viscosity inhibitor to the feed oil, reflux oil or directly to the tower bottom oil in the tower. Such an oil quench tower is used for an olefin production process in which the hydrocarbon may include naphtha, light oil, natural gas, liquefied natural gas, etc. in the raw material.Type: GrantFiled: May 22, 1997Date of Patent: October 20, 1998Assignee: Baker Hughes IncorporatedInventors: Noriaki Maeda, Toru Taguchi, Seiji Tanizaki, Nobumitsu Kumazawa, Yutaka Takeuchi
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Patent number: 5773674Abstract: The polymerization of a vinyl aromatic monomer such as styrene is inhibited by the addition of a composition of a benzoquinone derivative and a hydroxylamine compound.Type: GrantFiled: December 31, 1996Date of Patent: June 30, 1998Assignee: BetzDearborn Inc.Inventors: Graciela B. Arhancet, Inge K. Henrici
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Patent number: 5744672Abstract: A method for inhibiting the polymerization of vinyl aromatics such as styrene with a mixture of 3,5-di-tert-butyl-4-hydroxy-N,N-dimethylbenzyl amine and carboxylic acids or anhydrides thereof, in the presence of air or oxygen. The weight ratio of said 3,5-Di-tert-butylhydroxy-N,N-dimethylbenzyl amine, carboxylic acid (or carboxylic acid anhydride) and the air is 1:1 to 0.05:0.05 to 15, respectively.Type: GrantFiled: January 23, 1996Date of Patent: April 28, 1998Inventors: Vladimir Anatolievich Kourbatov, Nataljya Pavlovna Boreyko, Valerii Pavlovich Zouev, Alexandr Grigorievich Liakumovich
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Patent number: 5672793Abstract: Hydrocarbon-containing fluid compositions are provided comprising at least one hydrocarbon fluid, at least one heteroaromatic, and at least one hydrazine additive. The resulting composition has reduced temporal formation of colored materials and/or gummy deposits. Additionally, antioxidant additives are combined with the above composition and provide a further reduction in the formation of colored materials and/or gummy deposits.Type: GrantFiled: June 7, 1995Date of Patent: September 30, 1997Assignee: Phillips Petroleum CompanyInventors: Joseph E. Bares, Byron G. Johnson, Frederick J. Cornforth
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Patent number: 5659095Abstract: 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: GrantFiled: March 13, 1996Date of Patent: August 19, 1997Assignee: Uniroyal Chemical Company, Inc.Inventors: Howard Stephen Friedman, Gerald John Abruscato, John Matthew DeMassa, Anthony Vincent Gentile, Anthony Vincent Grossi
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Patent number: 5648574Abstract: Compositions and methods for inhibiting the polymerization of vinyl aromatic monomers in oxygen-free processing systems are disclosed. The compositions comprise a hydroxylamine compound, a phenylenediamine compound and a vinyl aromatic monomer. The methods comprise adding to the monomer bis-N,N'(hydroxypropyl)hydroxylamine.Type: GrantFiled: March 26, 1996Date of Patent: July 15, 1997Assignee: BetzDearborn Inc.Inventors: Graciela B. Arhancet, Inge K. Henrici
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Patent number: 5648572Abstract: Compositions and methods for inhibiting vinyl aromatic monomer polymerization during processing are disclosed. The compositions comprise a dinitrosalicylic acid derivative and a hydroxylamine compound. The methods comprise adding the composition to the monomer during processing. The preferred composition comprises 3,5-dinitrosalicylic acid or 3,5-dinitrosalicylic methyl ester and bis-(hydroxypropyl)hydroxylamine.Type: GrantFiled: May 31, 1995Date of Patent: July 15, 1997Assignee: BetzDearborn Inc.Inventors: Graciela B. Arhancet, Inge K. Henrici, J. Frederick Martin
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Patent number: 5621154Abstract: Methods are provided for cleaning and inhibiting the formation of fouling deposits on jet engine components during the combustion of turbine combustion fuel oils. Methods are also provided for inhibiting the formation and emission of soot and smoke from jet engine exhaust during turbine combustion fuel oil combustion. The methods employ a derivative of polyalkenylthiophosphonic acid added to the turbine combustion fuel oil. The preferred derivative is pentaerythritol ester of polyisobutenylthio-phosphonic acid.Type: GrantFiled: January 3, 1995Date of Patent: April 15, 1997Assignee: BetzDearborn Inc.Inventors: Bruce E. Wright, William L. Witzig
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Patent number: 5616774Abstract: Ethylenically unsaturated monomers are protected from premature polymerization during manufacture and storage by the incorporation therein of an effective stabilizing amount of a 7-aryl quinone methide compound.Type: GrantFiled: April 14, 1995Date of Patent: April 1, 1997Assignee: Ciba-Geigy CorporationInventors: Samuel Evans, Matthew E. Gande, Peter Nesvadba, Volker H. von Ahn, Roland A. E. Winter
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Patent number: 5596130Abstract: Methods and compositions are provided for cleaning and inhibiting the formation of fouling deposits on jet engine components during the combustion of turbine combustion fuel oils. Methods and compositions are also provided for inhibiting the formation and emission of soot and smoke from jet engine exhaust during turbine combustion fuel oil combustion. The methods employ a derivative of (thio)phosphonic acid added to the turbine combustion fuel oil. The preferred derivative is pentaerythritol ester of polyisobutenylthiophosphonic acid.Type: GrantFiled: October 25, 1995Date of Patent: January 21, 1997Assignee: Betz Laboratories, Inc.Inventors: Bruce E. Wright, William L. Witzig, Alan E. Goliaszewski, William S. Carey, Jeffrey H. Peltier