Patents Assigned to Chevron U.S.A.
-
Patent number: 11939527Abstract: Provided in one embodiment is a continuous process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and/or polypropylene, and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into offgas, a pyrolysis oil and optionally pyrolysis wax comprising a naphtha/diesel fraction and heavy fraction, and char. The pyrolysis oil and wax is passed to a refinery FCC feed pretreater unit. A heavy fraction is recovered and sent to a refinery FCC unit, from which a C3 olefin/paraffin mixture fraction is recovered, which is passed to a steam cracker for ethylene production. In another embodiment, a propane fraction (C3) is recovered from a propane/propylene splitter and passed to the steam cracker.Type: GrantFiled: October 30, 2022Date of Patent: March 26, 2024Assignee: Chevron U.S.A. Inc.Inventors: Hye-Kyung Timken, Cameron McCord
-
Patent number: 11939537Abstract: An improved reforming process for producing aromatic hydrocarbons is disclosed. The process includes two reformers arranged in parallel flow configuration, with the first reformer being a conventional reformer comprising a catalyst selective for reforming C8+ hydrocarbons to a reformate and the second reformer comprising a catalyst selective for reforming C7? hydrocarbons to a reformate. In certain embodiments, the first reformer catalyst comprises a conventional alumina catalyst and the second reformer catalyst comprises a ZSM-5 catalyst.Type: GrantFiled: April 21, 2020Date of Patent: March 26, 2024Assignee: Chevron U.S.A. Inc.Inventors: Cong-Yan Chen, Emmanuel Behraz
-
Publication number: 20240091750Abstract: A novel synthetic crystalline molecular sieve material, designated boron SSZ-41 is provided. The boron SSZ-41 is a boronzincosilicate molecular sieve having the framework structure of SSZ-41. It can be synthesized using 1,1?-(1,4-butanediyl)bis[4-aza-1-azoniabicyclo[2.2.2]octane] dications as a structure directing agent. The boronzincosilicate SSZ-41 may be used in organic compound conversion reactions and/or sorptive processes.Type: ApplicationFiled: August 30, 2023Publication date: March 21, 2024Applicant: Chevron U.S.A. Inc.Inventors: Stacey I. ZONES, Cong-Yan CHEN
-
Patent number: 11932547Abstract: An organotemplate-free synthetic process for synthesizing an aluminosilicate molecular sieve SSZ-122 is provided. The process includes (1) preparing a reaction mixture comprising: (a) a silicon atom source; (b) an aluminum atom source; (c) a source of an alkali metal [M]; (d) a source of hydroxide ions; (e) water; and (f) seed crystals; and (2) subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the aluminosilicate molecular sieve.Type: GrantFiled: March 10, 2022Date of Patent: March 19, 2024Assignee: CHEVRON U.S.A. INC.Inventor: Dan Xie
-
Publication number: 20240084204Abstract: An improved process for making a bright stock base oil from a base oil feedstream comprising an atmospheric resid feedstock, and, optionally, a base oil feedstock, via hydroprocessing. The process generally involves subjecting a base oil feedstream comprising the atmospheric resid to hydrocracking and dewaxing steps, and optionally to hydrofinishing, to produce base oil product(s) including a bright stock grade base oil product having a viscosity of at least about 22 cSt at 100° C. The invention is useful to make heavy grade base oil products such as bright stock, as well as Group II and/or Group III/III+ base oils.Type: ApplicationFiled: January 26, 2022Publication date: March 14, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Horacio TREVINO, Minghui ZHANG, Guan-Dao LEI, Thomas Ralph FARRELL
-
Publication number: 20240084205Abstract: Described herein is a hydrocracking catalyst and process that may be used to make middle distillates and unconverted oil having beneficial yield and product characteristics. The process generally comprises contacting a hydrocarbon feed with the hydrocracking catalyst under hydrocracking conditions to produce a product comprising middle distillates and unconverted oil products. The hydrocracking catalyst comprises an SSZ-91 molecular sieve and a modifying metal selected from one or more Group 6 metals, and, optionally, one or more Group 8 to 10 metals, or a modifying metal selected from Group 8 to 10 metals and combinations thereof, and, optionally, one or more Group 6 metals. The hydrocracking catalyst may comprise a matrix material and/or an additional zeolite.Type: ApplicationFiled: January 17, 2022Publication date: March 14, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Viorel DUMA, Theodorus Ludovicus Michael MAESEN, Hyungjae Alexander YOON
-
Patent number: 11928565Abstract: Methods and systems for building and maintaining model(s) of a physical process are disclosed. One method includes receiving training data associated with a plurality of different data sources, and performing a clustering process to form one or more clusters. For each of the one or more clusters, the method includes building a data model based on the training data associated with the data sources in the cluster, automatically performing a data cleansing process on operational data based on the data model, and automatically updating the data model based on updated training data that is received as operational data. For data sources excluded from the clusters, automatic building, data cleansing, and updating of models can also be applied.Type: GrantFiled: October 24, 2022Date of Patent: March 12, 2024Assignee: Chevron U.S.A. Inc.Inventors: Yining Dong, Alisha Deshpande, Yingying Zheng, Lisa Ann Brenskelle, Si-Zhao Qin
-
Publication number: 20240076563Abstract: Provided in one embodiment is an improved and more flexible process for preparing a finished base oil or a white oil product comprising passing a dewaxed base oil product to a distillation column and separating the dewaxed base oil product into fuel and base oil product streams. The base oil product streams are tested to determine if they meet desired specifications. Base oil product streams that meet the desired minimum base oil specifications are passed to a hydrofinishing reactor to prepare a white oil product, or passed to direct sale.Type: ApplicationFiled: December 24, 2021Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Kenneth John PEINADO, Jay PAREKH, Jifei JIA, Yihua ZHANG, Guan-Dao Lei, Guang ZHANG
-
Publication number: 20240076564Abstract: Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments, the processes relate to two stage (or more) hydrofinishing which advantageously provides base oils with lower aromatics than comparable one stage processes.Type: ApplicationFiled: January 18, 2022Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Subhasis BHATTACHARYA, Guan-Dao LEI
-
Publication number: 20240076560Abstract: Described herein is a process for hydroisomerising a hydrocarbon feed. The process may comprise: combining a hydrocarbon feed and a hydroisomerisation additive to provide a combined feed; and contacting the combined feed with a hydroisomerisation catalyst comprising zeolite SSZ-91, where the hydroisomerisation additive is a substituted or unsubstituted nitrogen heterocycle.Type: ApplicationFiled: December 20, 2021Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Guan-Dao LEI, Adeola Florence OJO
-
Publication number: 20240076555Abstract: Provided in one embodiment is a continuous process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and/or polypropylene, and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into offgas, a pyrolysis oil and optionally pyrolysis wax comprising a naphtha/diesel fraction and heavy fraction, and char. The pyrolysis oil and wax is passed to a refinery FCC feed pretreater unit. A heavy fraction is recovered and sent to a refinery FCC unit, from which a C3 olefin/paraffin mixture fraction is recovered, which is passed to a steam cracker for ethylene production. In another embodiment, a propane fraction (C3) is recovered from a propane/propylene splitter and passed to the steam cracker.Type: ApplicationFiled: October 30, 2022Publication date: March 7, 2024Applicant: Chevron U.S.A. Inc.Inventors: Hye-Kyung Timken, Cameron McCord
-
Publication number: 20240076565Abstract: Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments the processes comprise a step that reduces the amount of residual refractory sulfur compounds prior to or simultaneous with a hydrofinishing step which advantageously provides base oils with lower aromatics than comparable processes.Type: ApplicationFiled: January 18, 2022Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Guan-Dao LEI
-
Patent number: 11921256Abstract: Differential equations defining physics of a reservoir are modeled as a neural network. Measured data for the reservoir is used as boundary condition to calculate the different equation parameters. The result is a neural ordinary differential equation network that models reservoir characteristics (e.g., inter-well connectivities, response times for injection wells and production wells) using physics that are encoded into the network. The neural ordinary differential equation network provides a solution for the reservoir that is constrained by the physics of the reservoir.Type: GrantFiled: March 31, 2021Date of Patent: March 5, 2024Assignee: Chevron U.S.A. Inc.Inventors: Larry A. Bowden, Jr., Lokendra Jain, Irina V. Prestwood
-
Patent number: 11912947Abstract: A process involves (a) processing a lipid feedstock over a fluidized particulate catalyst in a gas-based stream in a fluid bed reactor to obtain a processed stream and spent catalyst comprising coke deposits, (b) continuously introducing the spent catalyst comprising the coke deposits to a catalyst regeneration unit, (c) continuously operating the catalyst regeneration unit to burn off the coke deposits from the spent catalyst to obtain a regenerated particulate catalyst, and (d) continuously introducing the regenerated particulate catalyst from the catalyst regeneration unit to the fluid bed reactor.Type: GrantFiled: June 8, 2023Date of Patent: February 27, 2024Assignee: Chevron U.S.A. Inc.Inventor: Sven Ivar Hommeltoft
-
Publication number: 20240059987Abstract: Provided is a process for preparing base oil from a waxy hydrocarbon feedstock by contacting the hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions. The reaction is in the presence of hydrogen and an inert gas, with the total pressure in the hydroisomerization zone being at least 400 psig. A product from the hydroisomerization zone is collected and separated into base oil products and fuel products. The inert gas can comprise any suitable inert gas, but is generally nitrogen, methane or argon. Nitrogen is used in one embodiment.Type: ApplicationFiled: December 24, 2021Publication date: February 22, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Kenneth John PEINADO, Jifei JIA, Guan-Dao LEI, Jay PAREKH, Yihua ZHANG
-
Publication number: 20240058802Abstract: An improved hydroisomerization catalyst and process for making a base oil product wherein the catalyst comprises a base extrudate that includes SSZ-91 molecular sieve and a high nanopore volume alumina. The catalyst and process generally involves the use of a SSZ-91/high nanopore volume alumina based catalyst to produce dewaxed base oil products by contacting the catalyst with a hydrocarbon feedstock. The catalyst base extrudate advantageously comprises an alumina having a pore volume in the 11-20 nm pore diameter range of 0.05 to 1.0 cc/g, with the base extrudate formed from SSZ-91 and the alumina having a total pore volume in the 2-50 nm pore diameter range of 0.12 to 1.80 cc/g. The catalyst and process provide improved base oil yield with reduced gas and fuels production.Type: ApplicationFiled: November 11, 2021Publication date: February 22, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Adeola Florence OJO, Guan Dao LEI
-
Publication number: 20240059986Abstract: Provided is a process for hydrocracking normal paraffins into lighter normal paraffins with minimal formation of iso-paraffins. The process comprises hydrocracking a hydrocarbon feedstock comprising normal paraffins under hydrocracking conditions. The reaction is run in the presence of a specific type of zeolite based catalyst which has been found to provide high conversion with minimal iso-paraffin products. In one embodiment, the zeolite is of the framework PWO. The reaction conducted in the presence of the zeolite based catalyst produces an n-paraffin rich product that needs no separation step before being fed to a steam cracker to produce lower olefins.Type: ApplicationFiled: December 29, 2021Publication date: February 22, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Joel SCHMIDT, Cong-Yan CHEN, Theodorus Ludovicus Michael MAESEN, Dan XIE
-
Patent number: 11905461Abstract: Disclosed are foam precursor compositions, foamed compositions, and methods of using these foamed compositions for the stimulation of unconventional reservoirs.Type: GrantFiled: July 7, 2020Date of Patent: February 20, 2024Assignee: CHEVRON U.S.A. INC.Inventors: Varadarajan Dwarakanath, Taimur Malik, Lin Zuo, Jimin Daniel Zhou, Nabijan Nizamidin, Gregory A. Winslow, Reza Banki, Mohamad Salman
-
Patent number: 11906505Abstract: A method of monitoring renewable carbon in fuel streams in a refinery or blend facility while co-processing a bio-feedstock with a fossil feedstock or blending a renewable product with a fossil product wherein the method provides for quantification of renewable C14 carbon content to adjust the total renewable content to a targeted renewable content in situ while lowering the limit of detection.Type: GrantFiled: February 10, 2022Date of Patent: February 20, 2024Assignee: CHEVRON U.S.A. INC.Inventors: Meir R. Hasbani, Michelle K. Young
-
Patent number: 11905466Abstract: Provided in one embodiment is a continuous process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and/or polypropylene, and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into offgas, a pyrolysis oil and optionally wax comprising a naphtha/diesel and heavy fraction, and char. The pyrolysis oil and wax is passed to a refinery FCC unit from which a liquid petroleum gas C3-C5 olefin/paraffin mixture fraction is recovered. The liquid petroleum gas C3-C5 olefin/paraffin mixture fraction is passed to a refinery alkylation unit, with a propane and butane fraction recovered from the alkylation unit. The propane and butane fraction is then passed to a steam cracker for ethylene production.Type: GrantFiled: October 30, 2022Date of Patent: February 20, 2024Assignee: Chevron U.S.A. Inc.Inventor: Hye-Kyung Timken