Patents by Inventor Majid Keyvani
Majid Keyvani 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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Patent number: 11926587Abstract: Disclosed herein is a process for upgrading a raffinate butene (C4 Raffinate) stream to propylene which can produce polymer grade propylene (PGP) by a metathesis process, without consuming fresh ethylene as a feedstock. By recycling ethylene byproduct in the metathesis equilibrium, propylene selectivity can be further improved without negatively impacting butene conversion. Additionally, upon PGP separation, this technology can provide an effluent acceptable for alkylate production by achieving a balanced butene conversion and heavies coproduction. The disclosed process is a relatively low temperature process which can be deployed as a drop-in option for conventional ethylene/butene metathesis unit and provide additional flexibility to existing operations to balance the supply and demand of C2-C4 light olefins.Type: GrantFiled: September 14, 2021Date of Patent: March 12, 2024Assignee: Lyondell Chemical Technology, L.P.Inventors: Lei Zhang, Pranit S. Metkar, Majid Keyvani, Daniel F. White
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Publication number: 20220081376Abstract: Disclosed herein is a process for upgrading a raffinate butene (C4 Raffinate) stream to propylene which can produce polymer grade propylene (PGP) by a metathesis process, without consuming fresh ethylene as a feedstock. By recycling ethylene byproduct in the metathesis equilibrium, propylene selectivity can be further improved without negatively impacting butene conversion. Additionally, upon PGP separation, this technology can provide an effluent acceptable for alkylate production by achieving a balanced butene conversion and heavies coproduction. The disclosed process is a relatively low temperature process which can be deployed as a drop-in option for conventional ethylene/butene metathesis unit and provide additional flexibility to existing operations to balance the supply and demand of C2-C4 light olefins.Type: ApplicationFiled: September 14, 2021Publication date: March 17, 2022Applicant: Lyondell Chemical Technology, L.P.Inventors: Lei Zhang, Pranit S. Metkar, Majid Keyvani, Daniel F. White
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Publication number: 20210331989Abstract: A low temperature on-purpose propylene production method is described. The method includes autometathesis of butene streams without an initial ethylene feedstock stream using supported autometathesis catalysts that are active at low temperatures. The low temperature allows for liquid phase reactions, which increases the selective production of propylene. The lack of an initial ethylene feedstock stream and low reaction temperature also reduces coking on the autometathesis catalysts, thus extending its lifetime.Type: ApplicationFiled: April 20, 2021Publication date: October 28, 2021Applicant: Lyondell Chemical Technology, L.P.Inventors: Lei Zhang, Majid Keyvani, Daniel F. White
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Patent number: 10829425Abstract: Systems and methods for purifying crude propane streams are provided herein. For example, in some embodiments, methods are provided including passing a crude propane stream to a fixed bed reactor containing a Beta zeolite configured to reduce the propylene oxide content of the crude propane stream and produce a propylene-treated stream and contacting the propylene-treated stream with an acetaldehyde scavenger to produce a treated propane stream. In some embodiments, methods are provided including passing a crude propane stream through a water wash system to provide a treated propane stream having a lower propylene oxide content, a lower acetaldehyde content, or both.Type: GrantFiled: March 18, 2020Date of Patent: November 10, 2020Assignee: Lyondell Chemical Technology, L.P.Inventor: Majid Keyvani
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Publication number: 20200216375Abstract: Systems and methods for purifying crude propane streams are provided herein. For example, in some embodiments, methods are provided including passing a crude propane stream to a fixed bed reactor containing a Beta zeolite configured to reduce the propylene oxide content of the crude propane stream and produce a propylene-treated stream and contacting the propylene-treated stream with an acetaldehyde scavenger to produce a treated propane stream. In some embodiments, methods are provided including passing a crude propane stream through a water wash system to provide a treated propane stream having a lower propylene oxide content, a lower acetaldehyde content, or both.Type: ApplicationFiled: March 18, 2020Publication date: July 9, 2020Applicant: Lyondell Chemical Technology, L.P.Inventor: Majid Keyvani
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Patent number: 10640437Abstract: Systems and methods for purifying crude propane streams are provided herein. For example, in some embodiments, methods are provided including passing a crude propane stream to a fixed bed reactor containing a Beta zeolite configured to reduce the propylene oxide content of the crude propane stream and produce a propylene-treated stream and contacting the propylene-treated stream with an acetaldehyde scavenger to produce a treated propane stream. In some embodiments, methods are provided including passing a crude propane stream through a water wash system to provide a treated propane stream having a lower propylene oxide content, a lower acetaldehyde content, or both.Type: GrantFiled: April 24, 2019Date of Patent: May 5, 2020Assignee: Lyondell Chemical Technology, L.P.Inventor: Majid Keyvani
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Publication number: 20200103165Abstract: Systems and methods for debottlenecking propane feed, including a propylene separation system and C3 distillation column are provided herein. In some embodiments, the method includes providing a dry feed stream including propane and propylene to a propylene separation system including a membrane configured to separate the C3 feed stream into a retentate stream and a permeate stream, and providing at least a portion of the permeate stream and at least a portion of the propylene discharge stream to a propylene refrigeration system.Type: ApplicationFiled: September 18, 2019Publication date: April 2, 2020Applicants: Equistar Chemicals, L.P., Lyondell Chemical Technology, L.P.Inventors: Carl D. Harry, Rob D. Fox, Majid Keyvani
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Publication number: 20190330128Abstract: Systems and methods for purifying crude propane streams are provided herein. For example, in some embodiments, methods are provided including passing a crude propane stream to a fixed bed reactor containing a Beta zeolite configured to reduce the propylene oxide content of the crude propane stream and produce a propylene-treated stream and contacting the propylene-treated stream with an acetaldehyde scavenger to produce a treated propane stream. In some embodiments, methods are provided including passing a crude propane stream through a water wash system to provide a treated propane stream having a lower propylene oxide content, a lower acetaldehyde content, or both.Type: ApplicationFiled: April 24, 2019Publication date: October 31, 2019Applicant: Lyondell Chemical Technology, L.P.Inventor: Majid Keyvani
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Patent number: 10343959Abstract: The present disclosure relates to processes for the removal of paraffins. The processes generally include providing a C4 containing stream including isobutylene, 1-butene, 2-butene, n-butane and isobutane, introducing the C4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process is selected from extractive distillation utilizing a solvent including an organonitrile, passing the C4 containing stream over a semi-permeable membrane and combinations thereof; and recovering the olefin rich stream from the paraffin removal process, wherein the olefin rich stream includes less than 5 wt. % paraffins.Type: GrantFiled: July 26, 2017Date of Patent: July 9, 2019Assignee: Lyondell Chemical Technology, L.P.Inventors: Majid Keyvani, Gary A. Sawyer, Arsam Behkish
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Publication number: 20180029958Abstract: The present disclosure relates to processes for the removal of paraffins. The processes generally include providing a C4 containing stream including isobutylene, 1-butene, 2-butene, n-butane and isobutane, introducing the C4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process is selected from extractive distillation utilizing a solvent including an organonitrile, passing the C4 containing stream over a semi-permeable membrane and combinations thereof; and recovering the olefin rich stream from the paraffin removal process, wherein the olefin rich stream includes less than 5 wt. % paraffins.Type: ApplicationFiled: July 26, 2017Publication date: February 1, 2018Applicant: Lyondell Chemical Technology, L.P.Inventors: Majid Keyvani, Gary A. Sawyer, Arsam Behkish
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Patent number: 7550065Abstract: A method for recovering a solvent from its mixture containing oligomers extracted from grafted polyolefins is disclosed. The method includes distilling the solvent from the mixture in the presence of a naphthalene compound. The method of the invention significantly increases the solvent recovering yield without causing the vessel fouling.Type: GrantFiled: April 21, 2005Date of Patent: June 23, 2009Assignee: Lyondell Chemical Technology, L.P.Inventors: Majid Keyvani, Jude T. Ruszkay, Edward P. Carey
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Publication number: 20060237299Abstract: A method for recovering a solvent from its mixture containing oligomers extracted from grafted polyolefins is disclosed. The method comprises distilling the solvent from the mixture in the presence of a naphthalene compound. The method of the invention significantly increases the solvent recovering yield without causing the vessel fouling.Type: ApplicationFiled: April 21, 2005Publication date: October 26, 2006Inventors: Majid Keyvani, Jude Ruszkay, Edward Carey
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Publication number: 20040064001Abstract: The present invention is directed to a process for preparing ethylene oxide-capped polyols which involves combining a double-metal cyanide-catalyzed polyol with a basic catalyst. The present invention is also directed to a process for preparing ethylene oxide-capped polyols which involves combining a double-metal cyanide-catalyzed polyol with a base-catalyzed polyol. The present invention is also directed to a process for preparing ethylene oxide-capped polyols in which removal of catalyst residues or salts formed by the neutralization of the basic catalyst is not required. The polyols produced by the processes of the present invention have a relatively high content of primary hydroxyl groups.Type: ApplicationFiled: September 30, 2002Publication date: April 1, 2004Inventors: Stephan Ehlers, Jose F. Pazos, Christian Steinlein, Michael Schneider, Jorg Hofmann, Majid Keyvani, John E. Hayes
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Patent number: 5962728Abstract: The present invention relates to a process for isolating aliphatic isocyanate monomer(s) from a liquid or viscous paste composition comprising polymeric isocyanate residues and the aliphatic isocyanate monomer(s), and for isolating solid polymeric isocyanate residue from said composition. Also disclosed is the aliphatic isocyanate monomer(s) and the solid polymeric isocyanate byproduct produced by this process.Type: GrantFiled: October 31, 1997Date of Patent: October 5, 1999Assignee: Arco Chemical Technology, L.P.Inventors: Robert W. Mason, Farhad Fadakar, Joseph P. Bridges, Larry K. Butler, Majid Keyvani
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Patent number: 5693862Abstract: The present invention is directed to a process for transporting toluenediamine (TDA) from a first site to a second site. The process of the invention comprises the steps of (a) providing a molten mass of TDA isomers at the first site; (b) cooling the molten mass to a temperature below the melting point, the molten mass thereby forming flowable particles of solid TDA in an inert gas; (c) providing an airtight storage vessel lined with a chemically inert liner; (d) storing the flowable particles of solid TDA in the lined storage vessel; (e) charging the storage vessel with inert gas; (f) transporting the storage vessel from the first site to the second site; and (g) remelting the TDA flowable particles in inert gas with TDA liquid that is superheated above the melting point to produce a molten TDA isomer mixture in inert gas having substantially the same isomer ratio as that of the molten mass.Type: GrantFiled: December 18, 1996Date of Patent: December 2, 1997Assignee: Arco Chemical Technology, L.P.Inventors: Majid Keyvani, Rekha Menon, James L. Meyer, Thomas W. Offill