Patents by Inventor Krishniah Parimi
Krishniah Parimi 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: 8088338Abstract: Disclosed are a system and an apparatus for regenerating an ionic liquid catalyst, which has been deactivated by conjunct polymers during any type of reaction producing conjunct polymers as a by-product, for example, isoparaffin-olefin alkylation. The system and apparatus are designed such that solvent extraction of conjunct polymers, freed from the ionic liquid catalyst through its reaction with aluminum metal, occurs as soon as the conjunct polymers de-bond from the ionic liquid catalyst.Type: GrantFiled: March 18, 2010Date of Patent: January 3, 2012Assignee: Chevron U.S.A. Inc.Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Publication number: 20110303088Abstract: Provided is a method for contacting a gas with a liquid in a rotating packed bed. The method comprises providing a rotating packed bed comprising two sets of rotatable packing rings disposed within a chamber and defining an interior region. The rotating packed bed also comprises at least one liquid distributor with an inlet for accepting a liquid, the inlet in communication with an exit port for infusing the liquid into the interior region. The liquid distributor also comprises at least one gas outlet for accepting gas which has passed through the packed bed and for removing the gas from the interior region. The two sets of rotatable packing rings are caused to rotate. Liquid is infused into the interior region by way of the liquid inlet, and gas is injected through at least one gas inlet into the interior region, with the liquid and gas passing through each of the packing rings in countercurrent flow.Type: ApplicationFiled: June 9, 2010Publication date: December 15, 2011Applicant: Chevron U.S.A. Inc.Inventors: Marcus Dutra E Mello, Manuel Lim, Krishniah Parimi, David Brossard
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Patent number: 8067656Abstract: A process for separating an ionic liquid from hydrocarbons employs a coalescer material having a stronger affinity for the ionic liquid than the hydrocarbons. The coalescer material can be a high surface area material having a large amount of contact area to which ionic liquid droplets dispersed in the hydrocarbons may adhere. The process includes feeding a mixture comprising ionic liquid droplets dispersed in hydrocarbons to a coalescer comprising the coalescer material. The process further includes a capture step involving adhering at least a portion of the ionic liquid droplets to the coalescer material to provide captured droplets and a coalescing step involving coalescing captured droplets into coalesced droplets. After the capture and coalescence steps, the coalesced droplets are allowed to fall from the coalescer material to separate the ionic liquid from the hydrocarbons and provide a hydrocarbon effluent.Type: GrantFiled: November 26, 2008Date of Patent: November 29, 2011Assignee: Chevron U.S.A. Inc.Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Publication number: 20110282114Abstract: This application provides a process for the production of alkylate blending components, comprising introducing a hydrocarbon feed stream comprising an olefin to an orifice of a nozzle, at a close distance from the orifice; and wherein the nozzle dispenses a mixture of one or more recirculated streams and the hydrocarbon feed stream through a throat of the nozzle to make alkylate gasoline blending components. This application also provides a process unit for the production of alkylate gasoline, comprising: a) a nozzle having an orifice that dispenses one or more recirculated streams comprising ionic liquid catalyst into a chamber in the nozzle, b) a conduit for introducing a hydrocarbon feed stream comprising an olefin to the orifice at a close distance from the orifice; and c) a throat connecting the chamber in the nozzle to an alkylation zone.Type: ApplicationFiled: May 14, 2010Publication date: November 17, 2011Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Patent number: 7955999Abstract: Disclosed are a system and an apparatus for regenerating an ionic liquid catalyst, which has been deactivated by conjunct polymers during any type of reaction producing conjunct polymers as a by-product, for example, isoparaffin-olefin alkylation. The system and apparatus are designed such that solvent extraction of conjunct polymers, freed from the ionic liquid catalyst through its reaction with aluminum metal, occurs as soon as the conjunct polymers de-bond from the ionic liquid catalyst.Type: GrantFiled: December 28, 2007Date of Patent: June 7, 2011Assignee: Chevron U.S.A. Inc.Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Publication number: 20110081282Abstract: The invention is a fluid distribution device for coupling with a fluid distribution conduit or chimney for improving the distribution of downwardly flowing poly-phase mixture including at least one gas phase and at least one liquid phase, above at least one catalyst bed of granular solid catalytic material. The fluid distribution device for receiving the liquid and gas phases has one or more openings in the top and/or upper portion of its height through which a gas phase can enter and has a gas conduit that opens to a mixing cavity within the device. The fluid distribution device further comprises one or more lateral openings for liquid ingress. The lateral opening or openings allow the liquid to enter a liquid conduit that opens to the internal mixing cavity. The mixing cavity allows intimate contact between the liquid and gas phases. Therefore the flow distribution device of the invention provides improved tolerance for tray out of levelness.Type: ApplicationFiled: October 7, 2009Publication date: April 7, 2011Inventors: Krishniah Parimi, Steven X. Song, Ralph E. Killen, Ronald K. Meeker, Steven A. Souers
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Publication number: 20100278699Abstract: An apparatus for regenerating an ionic liquid catalyst comprising a reactive extraction column, the reactive extraction column comprising: (a) an upper feed port, wherein a slurry of an ionic liquid catalyst and an aluminum metal enter the reactive extraction column; (b) a lower feed port, wherein a solvent and optionally a hydrogen gas enter the reactive extraction column; (c) a moveable bed comprised of the aluminum metal between the upper and lower feed ports, wherein the ionic liquid catalyst and the aluminum metal reacts to free conjunct polymers from the ionic liquid catalyst and some of the freed conjunct polymers are extracted from the ionic liquid catalyst by the solvent to provide regenerated ionic liquid catalyst; (d) a lower exit port, wherein the regenerated ionic liquid catalyst exits the reactive extraction column; and (e) an upper exit port, wherein the solvent and freed conjunct polymers exit the reactive extraction column.Type: ApplicationFiled: March 17, 2010Publication date: November 4, 2010Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Publication number: 20100172806Abstract: Disclosed are a system and an apparatus for regenerating an ionic liquid catalyst, which has been deactivated by conjunct polymers during any type of reaction producing conjunct polymers as a by-product, for example, isoparaffin-olefin alkylation. The system and apparatus are designed such that solvent extraction of conjunct polymers, freed from the ionic liquid catalyst through its reaction with aluminum metal, occurs as soon as the conjunct polymers de-bond from the ionic liquid catalyst.Type: ApplicationFiled: March 18, 2010Publication date: July 8, 2010Applicant: Chevron U.S.A. Inc.Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Hyu Chang
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Patent number: 7732364Abstract: A regeneration process for re-activating an ionic liquid catalyst, which is useful in a variety of reactions, especially alkylation reactions, and which has been deactivated by conjunct polymers. The process includes a reaction step and a solvent extraction step. The process comprises (a) providing the ionic liquid catalyst, wherein at least a portion of the ionic liquid catalyst is bound to conjunct polymers; and (b) reacting the ionic liquid catalyst with aluminum metal to free the conjunct polymers from the ionic liquid catalyst in a stirred reactor or a fixed reactor. The conjunct polymer is then separated from the catalyst phase by solvent extraction in a stirred extraction or packed column.Type: GrantFiled: December 28, 2007Date of Patent: June 8, 2010Assignee: Chevron U.S.A. Inc.Inventors: Bong-Kyu Chang, Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Saleh Elomari
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Publication number: 20100130799Abstract: Disclosed herein are processes in which precipitation permits removal of metal halides (e.g. AlCl3) from ionic liquids. After precipitation, the precipitated metal halides can be physically separated from the bulk ionic liquid. More effective precipitation can be achieved through cooling or the combination of cooling and the provision of metal halide seed crystals. The ionic liquids can be regenerated ionic liquid catalysts, which contain excess metal halides after regeneration. Upon removal of the excess metal halides, they can be reused in processes using ionic liquid catalysts, such as alkylation processes.Type: ApplicationFiled: November 26, 2008Publication date: May 27, 2010Applicant: Chevron U.S.A. Inc.Inventors: Moinuddin Ahmed, Huping Luo, Krishniah Parimi, Bong-Kyu Chang, Sara Lindsay
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Publication number: 20100130800Abstract: A process for separating an ionic liquid from hydrocarbons employs a coalescer material having a stronger affinity for the ionic liquid than the hydrocarbons. The coalescer material can be a high surface area material having a large amount of contact area to which ionic liquid droplets dispersed in the hydrocarbons may adhere. The process includes feeding a mixture comprising ionic liquid droplets dispersed in hydrocarbons to a coalescer comprising the coalescer material. The process further includes a capture step involving adhering at least a portion of the ionic liquid droplets to the coalescer material to provide captured droplets and a coalescing step involving coalescing captured droplets into coalesced droplets. After the capture and coalescence steps, the coalesced droplets are allowed to fall from the coalescer material to separate the ionic liquid from the hydrocarbons and provide a hydrocarbon effluent.Type: ApplicationFiled: November 26, 2008Publication date: May 27, 2010Applicant: Chevron U.S.A. Inc.Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Publication number: 20090170687Abstract: Disclosed are a system and an apparatus for regenerating an ionic liquid catalyst, which has been deactivated by conjunct polymers during any type of reaction producing conjunct polymers as a by-product, for example, isoparaffin-olefin alkylation. The system and apparatus are designed such that solvent extraction of conjunct polymers, freed from the ionic liquid catalyst through its reaction with aluminum metal, occurs as soon as the conjunct polymers de-bond from the ionic liquid catalyst.Type: ApplicationFiled: December 28, 2007Publication date: July 2, 2009Applicant: Chevron U.S.A. Inc.Inventors: Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Bong-Kyu Chang
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Publication number: 20090170688Abstract: A regeneration process for re-activating an ionic liquid catalyst, which is useful in a variety of reactions, especially alkylation reactions, and which has been deactivated by conjunct polymers. The process includes a reaction step and a solvent extraction step. The process comprises (a) providing the ionic liquid catalyst, wherein at least a portion of the ionic liquid catalyst is bound to conjunct polymers; and (b) reacting the ionic liquid catalyst with aluminum metal to free the conjunct polymers from the ionic liquid catalyst in a stirred reactor or a fixed reactor. The conjunct polymer is then separated from the catalyst phase by solvent extraction in a stirred extraction or packed column.Type: ApplicationFiled: December 28, 2007Publication date: July 2, 2009Applicant: Chevron U.S.A. Inc.Inventors: Bong-Kyu Chang, Huping Luo, Moinuddin Ahmed, Krishniah Parimi, Saleh Elomari
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Publication number: 20090171133Abstract: Provided is a process for producing low volatility, high quality gasoline blending components which comprises recirculation of at least a portion of a recovered stream comprising primarily isoparaffins. Recirculation of the stream allows for an enhanced I/O ratio and a more cost effective process.Type: ApplicationFiled: December 28, 2007Publication date: July 2, 2009Applicant: Chevron U.S.A. Inc.Inventors: Huping Luo, Abdenour Kemoun, Krishniah Parimi, Moinuddin Ahmed, Bong-Kyu Chang, Hye-Kyung Timken
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Patent number: 7473405Abstract: The invention in one embodiment is a nozzle device for coupling with a fluid distribution conduit for improving the distribution of an upward or downwardly flowing poly-phase mixture including at least one gas phase and at least one liquid phase, above at least one packed bed of granular solid or fluidized bed. The fluid distribution conduit for receiving liquid and gas phases has one or more lateral openings for flow over an upper portion of its height through which a gas phase can enter and has fluid distribution conduit having one or more lateral openings for flow over at least a lower portion of its height through which a liquid phase can enter the fluid distribution conduit. It also has at least one lower cross section for flow through which a mixture of gas and liquid communicate with a packed bed of granular solid or a fluidized bed.Type: GrantFiled: October 13, 2004Date of Patent: January 6, 2009Assignee: Chevron U.S.A. Inc.Inventors: Abdenour Kemoun, Krishniah Parimi, Duyen T. Nguyen
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Publication number: 20060078483Abstract: The invention in one embodiment is a nozzle device for coupling with a fluid distribution conduit for improving the distribution of an upward or downwardly flowing poly-phase mixture including at least one gas phase and at least one liquid phase, above at least one packed bed of granular solid or fluidized bed. The fluid distribution conduit for receiving liquid and gas phases has one or more lateral openings for flow over an upper portion of its height through which a gas phase can enter and has fluid distribution conduit having one or more lateral openings for flow over at least a lower portion of its height through which a liquid phase can enter the fluid distribution conduit. It also has at least one lower cross section for flow through which a mixture of gas and liquid communicate with a packed bed of granular solid or a fluidized bed.Type: ApplicationFiled: October 13, 2004Publication date: April 13, 2006Inventors: Abdenour Kemoun, Krishniah Parimi, Duyen Nguyen
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Patent number: 6589415Abstract: The present invention is directed to a method for hydroprocessing Fischer-Tropsch products. The invention in particular relates to an integrated method for producing liquid fuels from a hydrocarbon stream provided by Fischer-Tropsch synthesis. The method involves separating the Fischer-Tropsch products into a light fraction with normal boiling points below 700° F. and including predominantly C5-20 components and a heavy fraction with normal boiling points above 650° F. and including predominantly C20+ components. The heavy fraction is subjected to hydrocracking conditions, preferably through multiple catalyst beds, to reduce the chain length. The light fraction is used as all or part of a quench fluid between each catalyst bed.Type: GrantFiled: April 4, 2001Date of Patent: July 8, 2003Assignee: Chevron U.S.A., Inc.Inventors: Ben D. Smith, Krishniah Parimi, Richard O. Moore, Jr.
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Publication number: 20030042126Abstract: A photocatalytic method and apparatus employing a Holl-type mill for the direct production of methanol from methane and water comprising forming a water/methane emulsion and contacting the emulsion with a photocatalyst under conditions to react the methane and water to form methanol.Type: ApplicationFiled: August 30, 2001Publication date: March 6, 2003Inventors: Duyen T. Nguyen, Krishniah Parimi
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Publication number: 20020144929Abstract: The present invention is directed to a method for hydroprocessing Fischer-Tropsch products. The invention in particular relates to an integrated method for producing liquid fuels from a hydrocarbon stream provided by Fischer-Tropsch synthesis. The method involves separating the Fischer-Tropsch products into a light fraction and a heavy fraction. The heavy fraction is subjected to hydrocracking conditions, preferably through multiple catalyst beds, to reduce the chain length. The products of the hydrocracking reaction following the last catalyst bed, optionally after a hydroisomerization step, are combined with the light fraction. The combined fractions are hydrotreated, and, optionally, hydroisomerized. The hydrotreatment conditions hydrogenate double bonds, reduce oxygenates to paraffins, and desulfurize and denitrify the products. Hydroisomerization converts at least a portion of the linear paraffins into isoparaffins.Type: ApplicationFiled: April 4, 2001Publication date: October 10, 2002Inventors: Richard O. Moore, Krishniah Parimi, Duyen T. Nguyen, Dennis R. Cash
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Patent number: 6387334Abstract: The invention comprises an OCR catalyst reactor which includes passive spheres and catalyst particles having substantially the same size and separated on opposite sides of a distributor cone by a screen. The use of passive spheres of substantially the same size to the catalyst particles provides for a more uniform distribution of the gas liquid reactants charged into the reactor vessel. The screen is configured such that it provides a separation of the catalyst and the passive spheres while being sized to prevent plugging.Type: GrantFiled: December 18, 1998Date of Patent: May 14, 2002Assignee: Chevron U.S.A. Inc.Inventors: William B. Krantz, David E. Earls, Harold J. Trimble, Julie Chabot, Krishniah Parimi