Patents by Inventor Diwaker Singh
Diwaker Singh 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: 11820841Abstract: A polymerization process may include: polymerizing a monomer having 4 or less carbons and a comonomer having 6 or more carbons in the presence of an inert isomer/saturate of the comonomer to yield a product stream comprising a polymer, unreacted monomer, unreacted comonomer, and the inert isomer/saturate of the comonomer; separating the product stream into (a) a polymer stream and (b) an unreacted components stream; and separating the unreacted components stream in a distillation column into (a) an overhead stream comprising the unreacted monomer and (b) a bottoms stream comprising the comonomer and the inert isomer/saturate of the comonomer, wherein a concentration of C5? hydrocarbons in the overhead stream is higher than a concentration of the C5? hydrocarbons in the unreacted components stream, and wherein a concentration of C6+ hydrocarbons in the bottoms stream is higher than a concentration of the C6+ hydrocarbons in the unreacted components stream.Type: GrantFiled: May 1, 2020Date of Patent: November 21, 2023Assignee: ExxonMobil Chemical Patents Inc.Inventors: Steven P. Haynie, Giyarpuram N. Prasad, Diwaker Singh, Gautam Swamynathan, Stacy N. Apugo
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Patent number: 11618793Abstract: Gas phase polymerization processes include contacting an input stream comprising a monomer and an induced condensing agent in the presence of an inert gas with a catalyst in a fluidized bed reactor to produce a polymer, unreacted monomer, and an output gas; recycling a recycle stream of the unreacted monomer from the reactor to the input stream; venting at least a portion of the output gas from the reactor; and maintaining a partial pressure of the inert gas in the reactor above a reference inert gas pressure to decrease losses of the recycle stream with the vented output gas. The processes may include controlling the inert gas partial pressure to vary the total reactor pressure up to the maximum safe pressure, without causing carry-over of product polymer.Type: GrantFiled: July 30, 2021Date of Patent: April 4, 2023Assignee: ExxonMobil Chemical Patents Inc.Inventors: Michael D. Lucas, Anne Bernard-Brunel, Ryan W. Impelman, Keng-Hua Beh, Diwaker Singh, Sr., Rui Hoong Chong, Corrine L. Brandl, Luis A. Sotomayor
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Publication number: 20220064343Abstract: Gas phase polymerization processes include contacting an input stream comprising a monomer and an induced condensing agent in the presence of an inert gas with a catalyst in a fluidized bed reactor to produce a polymer, unreacted monomer, and an output gas; recycling a recycle stream of the unreacted monomer from the reactor to the input stream; venting at least a portion of the output gas from the reactor; and maintaining a partial pressure of the inert gas in the reactor above a reference inert gas pressure to decrease losses of the recycle stream with the vented output gas. The processes may include controlling the inert gas partial pressure to vary the total reactor pressure up to the maximum safe pressure, without causing carry-over of product polymer.Type: ApplicationFiled: July 30, 2021Publication date: March 3, 2022Inventors: Michael D. Lucas, Anne Bernard-Brunel, Ryan W. Impelman, Keng-Hua Beh, Diwaker Singh, Rui Hoong Chong, Corrine L. Brandl, Luis A. Sotomayor
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Publication number: 20200255564Abstract: A polymerization process may include: polymerizing a monomer having 4 or less carbons and a comonomer having 6 or more carbons in the presence of an inert isomer/saturate of the comonomer to yield a product stream comprising a polymer, unreacted monomer, unreacted comonomer, and the inert isomer/saturate of the comonomer; separating the product stream into (a) a polymer stream and (b) an unreacted components stream; and separating the unreacted components stream in a distillation column into (a) an overhead stream comprising the unreacted monomer and (b) a bottoms stream comprising the comonomer and the inert isomer/saturate of the comonomer, wherein a concentration of C5? hydrocarbons in the overhead stream is higher than a concentration of the C5? hydrocarbons in the unreacted components stream, and wherein a concentration of C6+ hydrocarbons in the bottoms stream is higher than a concentration of the C6+ hydrocarbons in the unreacted components stream.Type: ApplicationFiled: May 1, 2020Publication date: August 13, 2020Inventors: Steven P. Haynie, Giyarpuram N. Prasad, Diwaker Singh, Gautam Swamynathan, Stacy N. Apugo
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Publication number: 20140098798Abstract: A user equipment (UE) may employ Timing Advance (TA) reporting to detect possible error conditions during communication between a base station and the UE. In some instances, the UE receives commands to change a timing advance value. The UE declares an error condition when a timing advance value compared with a reference timing advance value changes more than a threshold amount during a specified time period.Type: ApplicationFiled: October 9, 2013Publication date: April 10, 2014Applicant: QUALCOMM IncorporatedInventors: Aamod Dinkar KHANDEKAR, Surendra BOPPANA, Insung KANG, Diwaker SINGH
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Patent number: 7714083Abstract: The present invention provides a method and apparatus for separating unreacted monomer from a polymerization process effluent stream, wherein the effluent stream comprises unreacted monomer and polymer particles. The method comprises passing the effluent stream of a fluidized-bed reactor into at least one container, feeding a high-pressure olefin through an ejector, and vacuuming at least a portion of the effluent stream from the at least one container through the ejector. The apparatus comprises a fluidized-bed reactor having a first conduit connected to a first tank, an ejector having a second conduit connected to the first tank, and a third conduit connected to the fluidized-bed reactor.Type: GrantFiled: March 8, 2006Date of Patent: May 11, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventor: Diwaker Singh
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Patent number: 7696289Abstract: The present invention relates to a continuous gas phase process comprising passing a recycle stream through a fluidized bed in a gas phase fluidized bed reactor, wherein the recycle stream comprises a low molecular weight dew point increasing component and a high molecular weight component, polymerizing an alpha-olefin monomer in the presence of a catalyst, and controlling an amount of the low molecular weight dew point increasing component in the recycle stream such that a dew point approach temperature of the recycle stream is less than the dew point approach temperature when operating with the higher molecular weight dew point increasing component alone.Type: GrantFiled: May 12, 2006Date of Patent: April 13, 2010Assignee: ExxonMobil Chemical Patents Inc.Inventors: D. Brett Fischbuch, Robert O. Hagerty, Sandy C. Hinds, Douglas R. Holroyd, Ai Vey Ng, Diwaker Singh
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Publication number: 20070265400Abstract: The present invention relates to a continuous gas phase process comprising passing a recycle stream through a fluidized bed in a gas phase fluidized bed reactor, wherein the recycle stream comprises a low molecular weight dew point increasing component and a high molecular weight component, polymerizing an alpha-olefin monomer in the presence of a catalyst, and controlling an amount of the low molecular weight dew point increasing component in the recycle stream such that a dew point approach temperature of the recycle stream is less than the dew point approach temperature when operating with the higher molecular weight dew point increasing component alone.Type: ApplicationFiled: May 12, 2006Publication date: November 15, 2007Inventors: D. Fischbuch, Robert Hagerty, Sandy Hinds, Douglas Holroyd, Ai Vey Ng, Diwaker Singh
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Publication number: 20070213478Abstract: The present invention provides a method and apparatus for separating unreacted monomer from a polymerization process effluent stream, wherein the effluent stream comprises unreacted monomer and polymer particles. The method comprises passing the effluent stream of a fluidized-bed reactor into at least one container, feeding a high-pressure olefin through an ejector, and vacuuming at least a portion of the effluent stream from the at least one container through the ejector. The apparatus comprises a fluidized-bed reactor having a first conduit connected to a first tank, an ejector having a second conduit connected to the first tank, and a third conduit connected to the fluidized-bed reactor.Type: ApplicationFiled: March 8, 2006Publication date: September 13, 2007Inventor: Diwaker Singh
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Publication number: 20050182207Abstract: A continuous gas fluidized bed polymerization process for the production of a polymer from a monomer including continuously passing a gaseous stream comprising the monomer through a fluidized bed reactor in the presence of a catalyst under reactive conditions; withdrawing a polymeric product and a stream comprising unreacted monomer gases; cooling said stream comprising unreacted monomer gases to form a mixture comprising a gas phase and a liquid phase and reintroducing said mixture into said reactor with sufficient additional monomer to replace that monomer polymerized and withdrawn as the product, wherein said liquid phase is vaporized, and wherein the stream comprises at least two inert condensing agents selected from the group consisting of alkanes, cycloalkanes, and mixtures thereof, each of the inert condensing agents having a normal boiling point less than 40° C.Type: ApplicationFiled: December 22, 2004Publication date: August 18, 2005Inventors: Diwaker Singh, Sandy Hinds, Brett Fischbuch, Ng Ai Vey
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Publication number: 20040127655Abstract: The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.Type: ApplicationFiled: October 10, 2003Publication date: July 1, 2004Inventors: Thomas Redden Veariel, George Varcelia Yenetchi, Sandy Clay Hinds, Diwaker Singh, Thierry Polchlopek