Patents by Inventor Veera Venkata Ramakrishna Tammana
Veera Venkata Ramakrishna Tammana has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240124317Abstract: A process of producing a mesoporous beta zeolite includes mixing a crystalline beta zeolite with one or more solvents, cetyltrimethylammonium bromide, and metal hydroxide to produce a solution, heating the solution at a temperature of from 50° C. to 150° C. to convert the crystalline beta zeolite to a non-crystalline material with reduced silica content relative to the crystalline beta zeolite, cooling the solution to a temperature of from 25° C. to 40° C., adjusting the pH of the solution to from 8 to 10 by adding an acid, and aging the solution at a temperature of from 50° C. to 150° C. for a time period sufficient to crystalize the non-crystalline material to produce beta zeolite particles.Type: ApplicationFiled: October 12, 2022Publication date: April 18, 2024Applicant: Saudi Arabian Oil CompanyInventors: Aaron Chi Akah, Veera Venkata Ramakrishna Tammana
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Patent number: 11896963Abstract: A process for upgrading a hydrocarbon feed includes contacting the hydrocarbon feed with steam in the presence of a cracking catalyst at reaction conditions sufficient to cause at least a portion of hydrocarbons in the hydrocarbon feed to undergo one or more cracking reactions to produce a steam catalytic cracking effluent comprising light olefins, light aromatic compounds, or both. The cracking catalyst is hierarchical mesoporous ZSM-5 zeolite. The hierarchical mesoporous ZSM-5 zeolite is made by providing a starting ZSM-5 zeolite, disintegrating the a portion of the starting ZSM-5 in the presence of a surfactant using sodium hydroxide, and then recrystallizing the zeolite constituents in the presence of the surfactant to produce recrystallized ZSM-5 zeolite. The recrystallized ZSM-5 zeolite is then recovered and calcined to produce the hierarchical mesoporous ZSM-5 zeolite.Type: GrantFiled: September 26, 2022Date of Patent: February 13, 2024Assignee: Saudi Arabian Oil CompanyInventors: Aaron Chi Akah, Veera Venkata Ramakrishna Tammana
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Patent number: 11857955Abstract: A process of producing a catalyst comprises forming mesoporous beta zeolite particles, impregnating mesoporous beta zeolite particles with a metal and phosphorus to produce a metal and phosphorus impregnated zeolite, and incorporating the metal and phosphorus impregnated zeolite with clay and alumina to produce the catalyst. The forming step comprises converting a crystalline beta zeolite to a non-crystalline material with reduced silica content relative to the crystalline beta zeolite, and crystalizing the non-crystalline material to produce mesoporous beta zeolite particles.Type: GrantFiled: October 12, 2022Date of Patent: January 2, 2024Assignee: Saudi Arabian Oil CompanyInventors: Aaron Chi Akah, Veera Venkata Ramakrishna Tammana
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Patent number: 11820948Abstract: A process for upgrading crude oil through steam enhanced catalytic cracking includes contacting crude oil with steam and a cracking catalyst at a mass ratio of steam to crude oil of 0.2-1. The cracking catalyst is a hierarchical mesoporous ZSM-5 zeolite impregnated with phosphorous, cerium, lanthanum, and iron. Contacting the crude oil with steam and the cracking catalyst cracks a portion of the crude oil to produce light olefins, light aromatic compounds, or both. The cracking catalyst is prepared by partially disintegrating a starting ZSM-5 zeolite in a first mixture comprising sodium hydroxide and a surfactant and, after the disintegrating, recrystallizing zeolite constituents in the presence of the surfactant to produce a recrystallized ZSM-5 zeolite having a hierarchical pore structure. The recrystallized ZSM-5 zeolite is recovered and calcined to produce the hierarchical mesoporous ZSM-5 zeolite, which is then impregnated with the phosphorous, lanthanum, cerium, and iron.Type: GrantFiled: September 29, 2022Date of Patent: November 21, 2023Assignee: Saudi Arabian Oil CompanyInventors: Aaron Chi Akah, Veera Venkata Ramakrishna Tammana
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Patent number: 11097262Abstract: A method of producing a hierarchical zeolite composite catalyst. The method including dissolving, in an alkaline solution and in the presence of a surfactant, a catalyst precursor comprising mesoporous zeolite to yield a dissolved zeolite solution, where the mesoporous zeolite comprises large pore mordenite and medium pore ZSM-5. The method also including condensing the dissolved zeolite solution to yield a solid zeolite composite from the dissolved zeolite solution and heating the solid zeolite composite to remove the surfactant. The method further including impregnating the solid zeolite composite with one or more active metals selected from the group consisting of molybdenum, platinum, rhenium, nickel, and combinations thereof to yield impregnated solid zeolite composite and calcining the impregnated solid zeolite composite to produce the hierarchical zeolite composite catalyst.Type: GrantFiled: April 20, 2018Date of Patent: August 24, 2021Assignee: Saudi Arabian Oil CompanyInventors: Veera Venkata Ramakrishna Tammana, Raed Hasan Abudawoud, Ahmad A. Jazzar, Ahmad Al Mahdi, Thamer A. Mohammad
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Patent number: 10981160Abstract: A method of producing a hierarchical zeolite composite catalyst is provided. The method includes dissolving, in an alkaline solution and in the presence of a surfactant, a catalyst precursor comprising mesoporous zeolite to yield a dissolved zeolite solution, where the mesoporous zeolite comprises large pore ZSM-12 and medium pore ZSM-5. The method also includes condensing the dissolved zeolite solution to yield a solid zeolite composite from the dissolved zeolite solution and heating the solid zeolite composite to remove the surfactant. The method further includes impregnating the solid zeolite composite with one or more active metals selected from the group consisting of platinum, rhenium, rhodium, molybdenum, nickel, tungsten, chromium, ruthenium, gold, and combinations thereof to yield impregnated solid zeolite composite and calcining the impregnated solid zeolite composite to produce the hierarchical zeolite composite catalyst.Type: GrantFiled: December 19, 2019Date of Patent: April 20, 2021Assignee: Saudi Arabian Oil CompanyInventors: Veera Venkata Ramakrishna Tammana, Raed Hasan Abudawoud, Ahmad A Jazzar, Mohammed Al Amer
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Patent number: 10927059Abstract: A method of making BTX (benzene, toluene, xylene) compounds by feeding a heavy reformate stream to a reactor, where the reactor includes a composite zeolite catalyst, that contains a mixture of a desilicated mesoporous mordenite and ZSM-5, and in which the desilicated mesoporous mordenite, the ZSM-5, or both, comprise one or more impregnated metals. The composite zeolite catalyst is able to catalyze the transalkylation reaction and the dealkylation reaction simultaneously to produce the BTX compounds.Type: GrantFiled: March 12, 2019Date of Patent: February 23, 2021Assignees: Saudi Arabian Oil Company, Universitat Politecnica De Valencia, Consejo Superior De Investigaciones CientificasInventors: Veera Venkata Ramakrishna Tammana, Raed Abudawoud, Avelino Corma Canos, M. Teresa Portilla Ovejero, M. Cristina Martinez Sanchez, Ibrahim M. Al-Zahrani
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Publication number: 20180361372Abstract: A method of producing a hierarchical zeolite composite catalyst. The method including dissolving, in an alkaline solution and in the presence of a surfactant, a catalyst precursor comprising mesoporous zeolite to yield a dissolved zeolite solution, where the mesoporous zeolite comprises large pore mordenite and medium pore ZSM-5. The method also including condensing the dissolved zeolite solution to yield a solid zeolite composite from the dissolved zeolite solution and heating the solid zeolite composite to remove the surfactant. The method further including impregnating the solid zeolite composite with one or more active metals selected from the group consisting of molybdenum, platinum, rhenium, nickel, and combinations thereof to yield impregnated solid zeolite composite and calcining the impregnated solid zeolite composite to produce the hierarchical zeolite composite catalyst.Type: ApplicationFiled: April 20, 2018Publication date: December 20, 2018Applicant: Saudi Arabian Oil CompanyInventors: Veera Venkata Ramakrishna Tammana, Raed Hasan Abudawoud, Ahmad A. Jazzar, Ahmad Al Mahdi, Thamer A. Mohammad
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Patent number: 9902677Abstract: Systems and methods for liquid-phase oxidation of an aromatic feedstock containing at least one oxidizable aromatic compound may incorporate an oxidation reactor, a separation apparatus in fluidic communication with the oxidation reactor, a solids treatment unit, and a product recovery unit in fluidic communication with the separation apparatus. The oxidation reactor may conduct liquid-phase oxidation of the oxidizable aromatic compound in the aromatic feedstock in the presence of a manganate salt to form a slurry containing liquid product and solid manganese dioxide. The separation apparatus may accept the slurry from the oxidation reactor and separate the liquid component from the solid component. The solids treatment unit accepts the solid component from the separation apparatus, treats the solid component with a basic liquid to oxidize the manganese dioxide in the solid component and form a regenerated manganate salt, which may be recycled back to the oxidation reactor.Type: GrantFiled: June 16, 2016Date of Patent: February 27, 2018Assignee: Saudi Arabian Oil CompanyInventors: Veera Venkata Ramakrishna Tammana, Kareemuddin M. Shaik, Guillaume Robert Jean-Francois Raynel
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Publication number: 20160289156Abstract: Systems and methods for liquid-phase oxidation of an aromatic feedstock containing at least one oxidizable aromatic compound may incorporate an oxidation reactor, a separation apparatus in fluidic communication with the oxidation reactor, a solids treatment unit, and a product recovery unit in fluidic communication with the separation apparatus. The oxidation reactor may conduct liquid-phase oxidation of the oxidizable aromatic compound in the aromatic feedstock in the presence of a manganate salt to form a slurry containing liquid product and solid manganese dioxide. The separation apparatus may accept the slurry from the oxidation reactor and separate the liquid component from the solid component. The solids treatment unit accepts the solid component from the separation apparatus, treats the solid component with a basic liquid to oxidize the manganese dioxide in the solid component and form a regenerated manganate salt, which may be recycled back to the oxidation reactor.Type: ApplicationFiled: June 16, 2016Publication date: October 6, 2016Applicant: Saudi Arabian Oil CompanyInventors: Veera Venkata Ramakrishna Tammana, Kareemuddin M. Shaik, Guillaume Robert Jean-Francois Raynel
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Patent number: 9388110Abstract: Systems and methods for liquid-phase oxidation of an aromatic feedstock containing at least one oxidizable aromatic compound may incorporate an oxidation reactor, a separation apparatus in fluidic communication with the oxidation reactor, a solids treatment unit, and a product recovery unit in fluidic communication with the separation apparatus. The oxidation reactor may conduct liquid-phase oxidation of the oxidizable aromatic compound in the aromatic feedstock in the presence of a manganate salt to form a slurry containing liquid product and solid manganese dioxide. The separation apparatus may accept the slurry from the oxidation reactor and separate the liquid component from the solid component. The solids treatment unit accepts the solid component from the separation apparatus, treats the solid component with a basic liquid to oxidize the manganese dioxide in the solid component and form a regenerated manganate salt, which may be recycled back to the oxidation reactor.Type: GrantFiled: December 12, 2013Date of Patent: July 12, 2016Inventors: Veera Venkata Ramakrishna Tammana, Kareemuddin M. Shaik, Guillaume Robert Jean-Francois Raynel
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Publication number: 20150166453Abstract: Systems and methods for liquid-phase oxidation of an aromatic feedstock containing at least one oxidizable aromatic compound may incorporate an oxidation reactor, a separation apparatus in fluidic communication with the oxidation reactor, a solids treatment unit, and a product recovery unit in fluidic communication with the separation apparatus. The oxidation reactor may conduct liquid-phase oxidation of the oxidizable aromatic compound in the aromatic feedstock in the presence of a manganate salt to form a slurry containing liquid product and solid manganese dioxide. The separation apparatus may accept the slurry from the oxidation reactor and separate the liquid component from the solid component. The solids treatment unit accepts the solid component from the separation apparatus, treats the solid component with a basic liquid to oxidize the manganese dioxide in the solid component and form a regenerated manganate salt, which may be recycled back to the oxidation reactor.Type: ApplicationFiled: December 12, 2013Publication date: June 18, 2015Applicant: SAUDI ARABIAN OIL COMPANYInventors: Veera Venkata Ramakrishna Tammana, Kareemuddin M. Shaik, Guillaume Robert Jean-Francois Raynel