Assignee: Chevron Chemical Company

Location: SanRamon, CA
No. of patents: 151

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Number	Title	Issue Date
6410491	Polyalkenyl sulfonates Provided is a polyalkenyl sulfonic acid composition comprising a mixture of polyalkenyl sulfonic acids derived from a mixture of polyalkenes comprising greater than 20 mole percent alkyl vinylidene and 1,1-dialkyl isomers, and a method for making the comp...	06/25/2002
6358892	Polyalkylene succinimides and post-treated derivatives thereof A succinimide composition is prepared by reacting a mixture of an alkenyl or alkylsuccinic acid derivative, an unsaturated acidic reagent copolymer, and a polyamine under reactive conditions; then treating the reaction product with either a cyclic carbona...	03/19/2002
6294506	Lubricating oils having carbonated sulfurized metal alkyl phenates and carbonated metal alkyl aryl sulfonates A lubricating oil composition has a major amount of an oil of lubricating viscosity, a minor amount of a carbonated sulfurized metal alkyl phenate and, a minor amount of a carbonated metal alkyl aryl sulfonate. The total base equivalents donated by the ph...	09/25/2001
6281404	Process for olefin isomerization A process for the double bond isomerization of olefinic feed compounds is provided comprising contacting the olefinic feed compounds and a catalyst under reaction conditions sufficient to produce double bond isomerization, wherein the catalyst is an alumi...	08/28/2001
6221116	Aminocarbamates of polyalkylphenoxyalkanols and fuel compositions containing the same Aminocarbamates of polyalkylphenoxyalkanols having the formula: ##STR1## wherein R is a polyalkyl group having an average molecular weight in the range of about 600 to 5,000; R1 and R2 are independently hydrogen or lower alkyl having 1 to...	04/24/2001
6207042	Reforming using a bound halided zeolite catalyst A catalytic reforming process comprising the catalytic conversion of hydrocarbons to aromatics, said process comprising treating a halided zeolite catalyst (hiz-cat) containing a Group VIII metal at commercial startup conditions and then reforming hydroca...	03/27/2001
6190539	Reforming using a bound halided zeolite catalyst A catalytic reforming process comprising the catalytic conversion of hydrocarbons to aromatics, said process comprising treating a halided zeolite catalyst (hiz-cat) containing a Group VIII metal at commercial startup conditions and then reforming hydroca...	02/20/2001
6159912	Low viscosity, chloride-free, low overbased alkyl-aryl-sulfonate, its application as an additive for lubricating oil, and methods of preparation A low overbased alkyl phenyl sulfonate prepared by the neutralization of sulfonic acid with a sulfurized high TBN calcium alkylphenate in the absence of chloride and in the absence of additional carboxylic acid....	12/12/2000
6156850	Process for making polyalkenyl derivative of an unsaturated acidic reagent A polyalkenyl derivative of an unsaturated acidic reagent prepared by the process of reacting a polyalkene having a Mn of at least 300 with an unsaturated acidic reagent at elevated temperatures in the absence of a strong acid until at least 25% of the po...	12/05/2000
6153553	Process for the polymerization of alpha olefins using a new aluminophosphate support Novel catalysts are provided for the polymerization of olefins such as ethylene. These catalysts comprise a novel amorphous aluminophosphate comprising, on a microlevel, sheets of aluminophosphate as well as spheres of aluminophosphate plus a chromium com...	11/28/2000
6146431	Polyalkylene polysuccinimides and post-treated derivatives thereof A polysuccinimide composition is prepared by reacting a mixture of an alkenyl or alkylsuccinic acid derivative, an unsaturated acidic reagent copolymer, and a polyamine under reactive conditions. The alkenyl or alkyl substituent of the alkenyl or alkylsuc...	11/14/2000
6136051	Method and composition for reduction of combustion chamber deposits A fuel composition has a major portion of hydrocarbons boiling in the gasoline range, at least 1,200 ppm by weight of a detergent, and at least 2,400 ppm by weight of a mineral carrier fluid. The detergent is a hydrocarbyl-substituted amine or polyamine h...	10/24/2000
6107450	Polyalkylene succinimides and post-treated derivatives thereof A succinimide composition is prepared by reacting a mixture of a polyalkenyl derivative, an unsaturated acidic reagent copolymer, and a polyamine under reactive conditions. The polyalkenyl derivative is produced by reacting an unsaturated acidic reagent w...	08/22/2000
6096936	L-type zeolite catalyst There are herein disclosed an L-type zeolite catalyst which is obtainable by supporting a platinum component, one or more halogen components and one or more metal components selected from the group Ib of the periodic table on an L-type zeolite, the suppor...	08/01/2000
6057487	Method for producing 2,6-DMN from mixed dimethylnaphthalenes by crystallization, adsorption and isomerization A method is disclosed to produce 2,6-dimethylnaphthalene (2,6-DMN), used for the production of polyethylene naphthalate, at high purity and high yield from a mixture of dimethylnaphthalene isomers without limitation to the specific isomers present in the ...	05/02/2000
6057013	Oxygen scavenging system including a by-product neutralizing material Provided is a system useful for oxygen scavenging which comprises at least two components, i.e., an oxygen scavenging material which forms at least one by-product upon reaction thereof with oxygen, and an effective amount of a neutralizing material capabl...	05/02/2000
6051128	Split-feed two-stage parallel aromatization for maximum para-xylene yield A full boiling hydrocarbon feed is reformed to enhance para-xylene and benzene yields. First, the hydrocarbon feed is separated into a C5- cut, a C6 -C7 cut, and a C8+ cut. The C6 -C7 cut ...	04/18/2000
6043181	Process for the polymerization of alpha olefins using a new aluminophosphate support Novel catalysts are provided for the polymerization of olefins such as ethylene. These catalysts comprise a novel amorphous aluminophosphate comprising, on a microlevel, sheets of aluminophosphate as well as spheres of aluminophosphate plus a chromium com...	03/28/2000
6031055	Olefin polymerization using aluminoxane/chromium catalysts A method of controlling the molecular weight distribution of a polyalpha-olefin during polymerization, comprising changing the aluminoxane to chromium ratio of a polymerization catalyst comprising chromium and at least one aluminoxane to thereby adjust th...	02/29/2000
6019943	Diffusion barriers for preventing high temperature hydrogen attack A method of protecting carbon and low-alloy steels from high temperature hydrogen attack. A carbon or low-alloy steel portion of a reactor system that is to be contacted with high pressure hydrogen at elevated temperatures is provided with an intermetalli...	02/01/2000
6015930	Method of making 2,6-dimethylnaphthalene from other dimethylnaphthalene isomers and from dimethyltetralins/dimethyldecalins with a methyl group on each ring The invention discloses a method of making 2,6-dimethylnaphthalene from any DMN with one methyl on each ring in a two-step hydroisomerization/dehydrogenation process. The catalyst used in the hydroisomerization step is an acidic catalyst such as a silica ...	01/18/2000
5993499	Fuel composition containing an aliphatic amine and a poly (oxyalkylene) monool A fuel composition comprising a major amount of hydrocarbons boiling in the gasoline or diesel range and (a) about 50 to 70 parts per million by weight of a fuel-soluble aliphatic hydrocarbyl-substituted amine having at least one basic nitrogen atom where...	11/30/1999
5994605	High viscosity polyalphaolefins A synthetic lubricant material is produced by forming a catalyst complex of a boron trifluoride catalyst and at least one alcohol promoter in the absence of olefinic monomer, then oligomerizing a C4-16 olefinic monomer by adding the olefinic mo...	11/30/1999
5985997	In situ process for making a bimodal HIPS having both high gloss and high impact strength A continuous bulk polymerization process for making a high gloss, high impact strength polystyrene based resin having a bimodal particle size distribution containing capsule particles having an average size of 0.2 to 0.6 microns and cellular particles hav...	11/16/1999
5968862	Transition metal-magnesium catalyst precursors for the polymerization of olefins Disclosed is a catalyst precursor, useful to make catalysts useful in the polymerization of olefins, comprising the product obtained by adding a preformed magnesium source to a solution comprising a solvent having dissolved therein a transition metal comp...	10/19/1999
5965783	Process for isomerizing olefins A process for producing a synthetic hydrocarbon product is provided comprising contacting under isomerization conditions an olefin feed comprising linear olefins with a catalyst comprising an intermediate pore size molecular sieve, wherein the catalyst is...	10/12/1999
5965675	Polymerization processes A polymerization process is provided comprising contacting under polymerization conditions a catalyst, a taming agent, ethylene and optionally a comonomer, wherein the catalyst comprises chromium oxide, titanium oxide and an inorganic refractory oxide, wh...	10/12/1999
5951723	Method to remedy engine intake valve sticking A method to prevent intake valve sticking, or to reduce or eliminate intake valve sticking when it has already occurred, in an internal combustion engine which comprises contacting the engine intake valves with a fuel composition comprising a major amount...	09/14/1999
5942476	Low-viscosity highly overbased phenate-carboxylate A low-viscosity overbased hydrocarbyl phenate-carboxylate is produced by contacting a mixture of a hydrocarbyl phenate, at least one solvent, metal hydroxide, aqueous metal chloride, and an alkyl polyhydric alcohol containing from one to five carbon atoms...	08/24/1999
5922922	Process for producing an alkylated, non-oxygen-containing aromatic hydrocarbon An alkylated aromatic hydrocarbon is produced having the following properties: (a) less than 40 wt. % of the alkylated aromatic hydrocarbon is 2-aryl; and (b) at least 20 wt. % of the alkylated aromatic hydrocarbon is a monoalkylate. That alkylated aromat...	07/13/1999
5914028	Reforming process with catalyst pretreatment A catalytic reforming process using a halided zeolite catalyst containing platinum in a metal-coated reactor system where, prior to catalyst loading and reforming, halide acid is removed from the catalyst. The process comprises providing a reforming react...	06/22/1999
5883031	Low temperature regeneration of coke deactivated reforming catalysts A process for regenerating a coke contaminated reforming catalyst comprising platinum on a molecular sieve, said process consisting essentially of contacting said catalyst with a halogen-free oxygen-containing gas at a temperature of less than 780° F. fo...	03/16/1999
5879538	Zeolite L catalyst in conventional furnace A process for catalytic reforming of feed hydrocarbons to form aromatics, comprising contacting the feed, under catalytic reforming conditions, with catalyst particles disposed in the tubes of a furnace, wherein the catalyst is a monofunctional, non-acidi...	03/09/1999
5880070	Cross-linked succinimides from an acid derivative, a polyamine, and a polycarboxylic acid derivative A polyalkylene succinimide composition prepared by reacting a mixture of an acid derivative, a polycarboxylic acid derivative; and a polyamine under reactive conditions. The acid derivative can be an alkenyl or alkylsuccinic acid derivative, a copolymer o...	03/09/1999
5877374	Low pressure hydrodealkylation of ethylbenzene and xylene isomerization A new process for the hydrodealkylation of ethylbenzene and the isomerization of xylenes at low pressure and at a low hydrogen to ethylbenzene mole ratio as well as a low hydrogen to hydrocarbon feed mole ratio using a catalyst comprising (a) HZSM-5 havin...	03/02/1999
5877367	Dehydrocyclization process with downstream dimethylbutane removal In the present invention, dimethylbutanes are removed from the raffinate component of the feed to a dehydrocyclization process. Thus, according to a preferred embodiment, a process is provided for producing aromatics by the following steps: (a) contacting...	03/02/1999
5872083	Post-treated derivatives of polyalkylene succinimides A succinimide composition is prepared by reacting a mixture of an alkenyl or alkylsuccinic acid derivative, an unsaturated acidic reagent copolymer, and a polyamine under reactive conditions. The alkenyl or alkyl substituent of the alkenyl or alkylsuccini...	02/16/1999
5869587	Process for the polymerization of alpha olefins using a new aluminophosphate support Novel catalysts are provided for the polymerization of olefins such as ethylene. These catalysts comprise a novel amorphous aluminophosphate comprising, on a microlevel, sheets of aluminophosphate as well as spheres of aluminophosphate plus a chromium com...	02/09/1999
5866743	Hydrodealkylation processes Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur....	02/02/1999
5866520	Lubricant composition suitable for direct fuel injected, crankcase-scavenged two-stroke cycle engines A lubricant composition is disclosed that is suitable for direct fuel injected, crankcase-scavenged two-stroke cycle engines. That lubricant composition has a major amount of at least one oil of lubricating viscosity, a minor amount of a lubricity additiv...	02/02/1999

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Assignee: Chevron Chemical Company