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| Number | Title | Issue Date |
| 7943809 | Composition and method for inhibiting polymerization and polymer growth A method for inhibiting the premature polymerization and the polymer growth of ethylenically unsaturated monomers is disclosed wherein the method comprises adding to said monomers an effective amount of at least one hydrogen donor or electron acceptor. In a preferre... | 05/17/2011 |
| 7381319 | Multi-amine neutralizer blends Amine and amine blend compositions neutralize acid environments in distillation overheads of hydrocarbon processing facilities. The neutralizers are composed of certain combinations of amines which are relatively stronger bases and more resistant to hydrochloride sa... | 06/03/2008 |
| 7381689 | Methods for inhibiting hydrate blockage in oil and gas pipelines using amide compounds A method and an amide composition used therein for inhibiting, retarding, mitigating, reducing, controlling and/or delaying formation of hydrocarbon hydrates or agglomerates of hydrates. The method may be applied to prevent or reduce or mitigate plugging of conduits... | 06/03/2008 |
| 7332070 | Method of preventing heat exchanger fouling 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 ... | 02/19/2008 |
| 7297823 | Additives for inhibiting the formation of gas hydrates The invention relates to the use of polymers which contain between 1 and 99 mol-% structural units of formula 1, wherein R1 represents hydrogen or C1-C6 alkyl, R2 represents C | 11/20/2007 |
| 7291685 | Process for producing low polymer of α-olefin There is disclosed a process for producing an α-olefin oligomer by subjecting an α-olefin to oligomerization reaction in the presence of a catalyst and an organic solvent which comprises the step of spraying a solvent containing the organic solvent in the form of ... | 11/06/2007 |
| 7282136 | Method of dispersing hydrocarbon foulants in hydrocarbon processing fluids A method of dispersing, dissolving, or reducing the viscosity of hydrocarbon foulants including heavy oil, tars, asphaltenes, polynuclear aromatic hydrocarbons, coke, polymers, light oil, oxidized hydrocarbon and thermal decomposition products, and the like in fluid... | 10/16/2007 |
| 7208648 | Minimizing corrosion in a methanol-to-olefin effluent processing system The present invention is directed toward reducing corrosion in a methanol-to-olefin (MTO) effluent processing system, and particularly in the condensate removal system thereof, by injecting a neutralization agent into one or more target regions of the MTO effluent p... | 04/24/2007 |
| 7202391 | Process for inhibiting polymerization of an aromatic vinyl compound 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 l... | 04/10/2007 |
| 7164051 | Gas hydrate inhibitors A method for inhibiting formation of hydrocarbon hydrates in mixtures of water and a hydrate-forming guest molecule involves adding a reaction product to the mixtures in an effective amount to inhibit formation of the hydrocarbon hydrates under conditions otherwise ... | 01/16/2007 |
| 7160437 | Method for determining the source of fouling in thermal conversion process units The present invention relates to a method for determining the source of fouling in petroleum thermal conversion process units. More particularly, the invention distinguishes whether fouling occurs due to feed entrainment of small feed droplets or vapor phase condens... | 01/09/2007 |
| 7154016 | Atomized polysulfide used in ethylene steam cracker Dialkyl polysulfides can be added to hydrocarbon gas fed streams for alkene steam crackers for the petrochemical industry. The polysulfides act as sulfiding agents for surfaces of the steam crackers and thereby reduce coking and CO generation. A preferred polysulfid... | 12/26/2006 |
| 7141711 | Catalyst fines handling process The present invention is a process for removing catalyst fines from a reactor effluent stream that has catalyst fines therein. The process comprises withdrawing the reactor effluent stream from the reactor. The reactor effluent stream is transported in a first condu... | 11/28/2006 |
| 7128826 | Polymerization inhibitor for styrene dehydrogenation units Quinone methide derivatives such as 4-benzylidene-2,6-di-tert-butyl-cyclohexa-2,5 dienone are used to inhibit styrene monomer polymerization in the dehydrogenator portion of a styrene monomer production system. The inhibitor contacts the dehydrogenation effluent and... | 10/31/2006 |
| 7125475 | Nitrosophenols and C-nitrosoanilines as polymerization inhibitors Inhibitor blends that include both nitrosophenols and nitrosoanilines, optionally in combination with air or oxygen, reduce the premature polymerization of ethylenically unsaturated monomers. unsaturated monomers. ... | 10/24/2006 |
| 7049477 | Process for pyrolysis of hydrocarbon The present invention relates to a process for pyrolysis of hydrocarbons for olefin preparation, and particularly to a process for pyrolysis of hydrocarbons comprising pyrolyzing paraffin hydrocarbons in the presence of steam to prepare olefins, where the pyrolysis ... | 05/23/2006 |
| 7022220 | C-nitrosoaniline compounds and their blends as polymerization inhibitors 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 o... | 04/04/2006 |
| 7008466 | Method for inhibiting hydrate formation A method for inhibiting the formation of gas hydrates within a fluid comprising a gaseous hydrocarbon phase, a liquid hydrocarbon phase and an aqueous phase which method comprises mixing a polymeric emulsifier and optionally a non-ionic non-polymeric co-emulsifier w... | 03/07/2006 |
| 6984766 | Method for side-chain alkylation or alkenylation In a process for reducing the formation of polymers during side-chain alkylation or side-chain alkenylation of alkylaromatic compounds by reaction with olefins or diolefins in the presence of an alkali metal catalyst followed by distillation in order to isolate the ... | 01/10/2006 |
| 6926820 | Inhibition of viscosity increase and fouling in hydrocarbon streams including unsaturation A method of inhibiting fouling and viscosity increase in hydrocarbon streams including ethylenically unsaturated monomers is disclosed. The method includes the step of adding to the hydrocarbon stream an effective amount of one or more quinone methides of the formul... | 08/09/2005 |
| 6908543 | Method for retarding fouling of feed heaters in refinery processing A method of minimizing the formation of polymers and other heavy molecular weight products upon heating of a hydrocarbon stream in a hydroconversion process is described. Specifically, sufficient hydrogen-containing gas is added to the hydrocarbon stream before heat... | 06/21/2005 |
| 6902663 | C-nitrosoaniline compounds and their blends as polymerization inhibitors 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 o... | 06/07/2005 |
| 6899806 | C-nitrosoaniline compounds and their blends as polymerization inhibitors Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of: A) at least one first inhibitor selected from the group consisting of C-nitrosoaniline co... | 05/31/2005 |
| 6894007 | Additives for inhibiting gas hydrate formation The invention relates to the use of compounds of the formula (1) in which R1 is C1- to C24-alkyl, C2- to C24-alkenyl or a C6- to C18 | 05/17/2005 |
| 6867262 | Grafted polymers as gas hydrate inhibitors Graft polymers are used as gas hydrate inhibitors. ... | 03/15/2005 |
| 6824672 | Use of austenitic stainless steels in applications requiring anti-coking properties 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; ... | 11/30/2004 |
| 6790547 | Process for reducing coke formation in hydrocarbon processing by application of radio frequency electromagnetic radiation utility 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 m... | 09/14/2004 |
| 6787024 | Process for reducing coke agglomeration in coking processes 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. ... | 09/07/2004 |
| RE38532 | Hydrodealkylation processes Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur. ... | 06/08/2004 |
| 6685823 | C-nitrosoaniline compounds and their blends as polymerization inhibitors 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 quin... | 02/03/2004 |
| 6652660 | Method for treating hazardous and corrosion-inducing sulfur compounds 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... | 11/25/2003 |
| 6623625 | Naphthene ring opening over group VIII metal catalysts containing cracking moderators 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 selec... | 09/23/2003 |
| 6602483 | Increasing production in hydrocarbon conversion processes 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 co... | 08/05/2003 |
| 6596911 | Composition and method for inhibition of formation of gas hydrates 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. The method and composition are particularly useful for oil and g... | 07/22/2003 |
| 6566309 | Additives for inhibiting gas hydrate formation The invention relates to the use of compounds of the formula (1) ##STR1## in which R1 is C1 -C30 -alkyl, C2 -C30 -alkenyl or a group of the formula --CH2 --CO--NR2 R3 or a ... | 05/20/2003 |
| 6482311 | Methods for suppression of filamentous coke formation 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 ad... | 11/19/2002 |
| 6464858 | Method for improving the yield of heavy hydrocarbons in a thermal cracking process 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.... | 10/15/2002 |
| 6458292 | Composition of an anti-scale-forming agent 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: ##STR1## By integrating both characteristics into a ... | 10/01/2002 |
| 6454995 | Phosphine coke inhibitors for EDC-VCM furnaces 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... | 09/24/2002 |
| 6451892 | Method for preventing or retarding the formation of gas hydrates 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 molecu... | 09/17/2002 |
