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Chevron Chemical Company Patents
Assignee:
Chevron Chemical Company
Address:
San Ramon, CA
No. of patents:
156
Patents:


1 2 3 4










Patent Number Title Of Patent Date Issued
6358892 Polyalkylene succinimides and post-treated derivatives thereof March 19, 2002
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 carbonate or a linear mono- or polycarbo
6294506 Lubricating oils having carbonated sulfurized metal alkyl phenates and carbonated metal alkyl ar September 25, 2001
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 phenate is more than 85% of the tot
6221116 Aminocarbamates of polyalkylphenoxyalkanols and fuel compositions containing the same April 24, 2001
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;R.sub.1 and R.sub.2 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms; andA is a polyamine moiet
6153553 Process for the polymerization of alpha olefins using a new aluminophosphate support November 28, 2000
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 compound. These new catalysts are
6139909 Using hydrocarbon streams to prepare a metallic protective layer October 31, 2000
A process for producing a metallic protective layer whereby a metal-containing plating, cladding, paint or other coating is applied to at least a portion of a reactor system and then contacted with a gaseous stream containing hydrocarbons, such as impure hydrogen, thereby producing a
6136051 Method and composition for reduction of combustion chamber deposits October 24, 2000
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 having at least one basic nitr
6057487 Method for producing 2,6-DMN from mixed dimethylnaphthalenes by crystallization, adsorption and May 2, 2000
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 feed by a series of fractionation
6057013 Oxygen scavenging system including a by-product neutralizing material May 2, 2000
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 capable of neutralizing at least a port
6051128 Split-feed two-stage parallel aromatization for maximum para-xylene yield April 18, 2000
A full boiling hydrocarbon feed is reformed to enhance para-xylene and benzene yields. First, the hydrocarbon feed is separated into a C.sub.5- cut, a C.sub.6 -C.sub.7 cut, and a C.sub.8+ cut. The C.sub.6 -C.sub.7 cut has less than 5 lv. % of C.sub.8+ hydrocarbon, and the C.sub.8+ cut
6043181 Process for the polymerization of alpha olefins using a new aluminophosphate support March 28, 2000
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 compound. These new catalysts are
6031055 Olefin polymerization using aluminoxane/chromium catalysts February 29, 2000
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 the molecular weight distributi
6019943 Diffusion barriers for preventing high temperature hydrogen attack February 1, 2000
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 intermetallic, diffusion barrier layer th
6015930 Method of making 2,6-dimethylnaphthalene from other dimethylnaphthalene isomers and from dimethy January 18, 2000
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 aluminum catalyst with a hydr
6015776 Polyalkylene polysuccinimides and post-treated derivatives thereof January 18, 2000
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 alkylsuccinic acid derivative has a Mn of
5994605 High viscosity polyalphaolefins November 30, 1999
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 C.sub.4-16 olefinic monomer by adding the olefinic monomer to a reaction vessel containing t
5993499 Fuel composition containing an aliphatic amine and a poly (oxyalkylene) monool November 30, 1999
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 wherein the hydrocarbyl group has a nu
5985997 In situ process for making a bimodal HIPS having both high gloss and high impact strength November 16, 1999
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 having an average particle size of 1
5968862 Transition metal-magnesium catalyst precursors for the polymerization of olefins October 19, 1999
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 compound and an alkyl halide.
5965783 Process for isomerizing olefins October 12, 1999
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 substantially free of Group
5965675 Polymerization processes October 12, 1999
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, wherein the taming agent is sel
5951723 Method to remedy engine intake valve sticking September 14, 1999
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 of hydrocarbons boiling in the
5942476 Low-viscosity highly overbased phenate-carboxylate August 24, 1999
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 with carbon dioxide under ov
5922922 Process for producing an alkylated, non-oxygen-containing aromatic hydrocarbon July 13, 1999
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 aromatic hydrocarbon is produced by
5914028 Reforming process with catalyst pretreatment June 22, 1999
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 reactor system having a metal coating;
5883031 Low temperature regeneration of coke deactivated reforming catalysts March 16, 1999
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.degree. F. for a sufficient period o
5880070 Cross-linked succinimides from an acid derivative, a polyamine, and a polycarboxylic acid deriva March 9, 1999
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 of a first unsaturated acidic
5879538 Zeolite L catalyst in conventional furnace March 9, 1999
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-acidic catalyst and comprises a Group
5877374 Low pressure hydrodealkylation of ethylbenzene and xylene isomerization March 2, 1999
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 having a particle size less than 1
5877367 Dehydrocyclization process with downstream dimethylbutane removal March 2, 1999
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 fresh paraffins rich feed hydroca
5872083 Post-treated derivatives of polyalkylene succinimides February 16, 1999
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 alkylsuccinic acid derivative has a Mn of
5869587 Process for the polymerization of alpha olefins using a new aluminophosphate support February 9, 1999
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 compound. These new catalysts are
5866743 Hydrodealkylation processes February 2, 1999
Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur.
5866520 Lubricant composition suitable for direct fuel injected, crankcase-scavenged two-stroke cycle en February 2, 1999
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 additive, a polyalkyl amide, an imid
5863418 Low-sulfur reforming process January 26, 1999
Disclosed is a method for reforming hydrocarbons comprising contacting the hydrocarbons with a catalyst in a reactor system of improved resistance to carburization and metal dusting under conditions of low sulfur.
5859145 Compositions having ethylenic backbone and benzylic, allylic, or ether-containing side-chains, o January 12, 1999
Disclosed is a process for esterifying and/or transesterifying a polymer having a polyethylenic backbone and pendant acid and/or ester moieties comprising contacting a melt of the polymer with a transesterifying compound so that the polymer undergoes esterification and/or transesteri
5853434 Fuel compositions having polyalkylene succinimides and preparation thereof December 29, 1998
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 alkylsuccinic acid derivative has a Mn of
5851965 Dispersant compositions having polyalkylene succinimides December 22, 1998
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 alkylsuccinic acid derivative has a Mn of
5851493 Injection system and method for feeding particulate to a process vessel December 22, 1998
An injection system and method for feeding a particulate material to a process vessel, including a valve with at least one cavity adapted for receipt of a predetermined volume of particulate and a sweep stream source for providing a sweep stream having flow in a direction generally towar
5851379 Reforming process using monofunctional catalyst containing bismuth December 22, 1998
A catalytic reforming process is disclosed using a catalyst containing a Group VIII metal, low amounts of bismuth, and a zeolite L. The catalyst is a non-acidic, monofunctional reforming catalyst. Preferably, the catalyst contains one or more halogens. Preferably, the feed includes C.sub
5851242 Fuel additive compositions containing polyalkylphenoxy-aminoalkanes and poly (oxyalkylene) amine December 22, 1998
A fuel additive composition comprising:(a) a polyalkylphenoxyaminoalkane having the formula: ##STR1## or a fuel soluble salt thereof, wherein R is a polyalkyl group having an average molecular weight in the range of about 600 to 5,000;R.sub.1 and R.sub.2 are independently hydrogen or low
5849969 Hydrodealkylation processes December 15, 1998
Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of sulfur.
5849676 Post-treated derivatives of polyalkylene succinimides December 15, 1998
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 alkylsuccinic acid derivative has a Mn of
5849675 Hydraulic system using an improved antiwear hydraulic fluid December 15, 1998
A hydraulic system containing a piston-type pump having wear surfaces containing copper or a copper alloy, and, optionally, a vane-type pump having wear surfaces containing steel, uses an antiwear hydraulic fluid having an oil of lubricating viscosity and minor amounts of zinc dithio
5837779 Process for producing ionomers employing ethylene terpolymers November 17, 1998
A process for the production of an ionomers containing ethylenically-unsaturated structural units comprising contacting:(a) a terpolymer containing structural units produced from (i) at least one .alpha.-olefin having from 2 to 8 carbon atoms; (ii) at least one ester of alpha, beta-ethyl
5833838 Cracking processes November 10, 1998
Methods for cracking hydrocarbons in reactor systems having improved resistances to carburization and coking. The reactor system comprises a steel portion having provided thereon a Group VIB metal protective layer to isolate the steel portion from hydrocarbons, applied to a thickness
5830244 Poly (oxyalkyene) benzyl amine ethers and fuel compositions containing the same November 3, 1998
A fuel additive having the formula: ##STR1## wherein R.sub.1 and R.sub.2 are independently hydrogen or lower alkyl; R.sub.3 and R.sub.4 are independently hydrogen or lower alkyl and each R.sub.3 and R.sub.4 is independently selected in each --O--CHR.sub.3 --CHR.sub.4 -- unit; R.s
5821205 Polyalkylene succinimides and post-treated derivatives thereof October 13, 1998
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 alkylsuccinic acid derivative has a Mn of
5817899 Polyalphaolefin dimers having low kinematic viscosities October 6, 1998
A dimer composition has an improved low temperature viscosity if it has less than a certain amount of normal paraffin. A 1-octene dimer should have less than 0.50 wt. % normal hexadecane, a 1-decene dimer should have less than 0.05 wt. % normal eicosane, a 1-dodecene dimer should have le
5807842 Hydrocarbon processing in equipment having increased halide stree-corrosion cracking resistance September 15, 1998
A hydrocarbon conversion process wherein austenitic stainless steel portions that are subject to halide stress-corrosion cracking conditions, such as the colder portions of the process equipment including effluent coolers, knockout drums, accumulation drums, and piping low points, are
5807814 Bis(thio)ethylene ashless wear inhibitors and lubricating oils and greases September 15, 1998
Oil soluble compounds having the formula: ##STR1## wherein R and R.sup.1 are independently cyano, alkoxycarbonyl, aryloxycarbonyl, alkenyloxycarbonyl, alkylcarbonyl, arylcarbonyl, alkenylcarbonyl, alkylsulfonyl, arylsulfonyl, alkenylsulfonyl, substituted aminocarbonyl, alkylphosp
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