Patents by Inventor Sumit CHAKRABORTY
Sumit CHAKRABORTY 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: 20220251020Abstract: A process for direct esterification of an alkyl aldehyde with an alkyl alcohol to produce an alkyl ester is disclosed. The process comprises reacting an alkyl aldehyde with an alkyl alcohol in the presence of an Au/TiOa catalyst, a base and an enal or oxygen to form an ester and an aldehyde. The process avoids liberation of water and avoids the step of oxidation of the alkyl aldehyde to an alkyl acid.Type: ApplicationFiled: November 12, 2019Publication date: August 11, 2022Applicant: Eastman Chemical CompanyInventors: William Christopher Ketchie, Sumit Chakraborty, Leslie Sharon Depew
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Publication number: 20220169505Abstract: Methods for producing cyclododecasulfur are disclosed that include the steps of: reacting a metallasulfur derivative with a molecular halogen to produce cyclododecasulfur and a metallahalide derivative; and reacting the metallahalide derivative with a sulfide or polysulfide to produce the metallasulfur derivative and a halide.Type: ApplicationFiled: March 5, 2020Publication date: June 2, 2022Applicant: EASTMAN CHEMICAL COMPANYInventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, SUMIT CHAKRABORTY, MICHAEL RICHARD LANINGHAM, VICKIE HAGOOD OSBORNE, LESLIE SHARON DEPEW, ANNETTE ELIZABETH STEVENS, JOHN DEREK WOOLLINS, GUOXIONG HUA
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Publication number: 20220169506Abstract: Methods for producing cyclododecasulfur are disclosed, that include the steps of: oxidizing a bromide in aqueous solution to produce a mixture of molecular bromine, tribromide, and bromide; reducing water to produce hydrogen and a hydroxide; and reacting a metallasulfur derivative with the molecular bromine, to produce cyclododecasulfur and a metallabromide derivative.Type: ApplicationFiled: March 5, 2020Publication date: June 2, 2022Applicant: EASTMAN CHEMICAL COMPANYInventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, SUMIT CHAKRABORTY, MICHAEL RICHARD LANINGHAM, VICKIE HAGOOD OSBORNE, LESLIE SHARON DEPEW, ANNETTE ELIZABETH STEVENS, JOHN DEREK WOOLLINS, GUOXIONG HUA
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Publication number: 20220162068Abstract: Methods for producing cyclododecasulfur are disclosed that include the steps of: reacting a bromide with molecular chlorine to obtain molecular bromine and a chloride; oxidizing the chloride in aqueous solution with removal of electrons to obtain molecular chlorine; reducing water with electrons to obtain hydrogen and a hydroxide; and reacting a metallasulfur derivative with the molecular bromine, to produce cyclododecasulfur and a metallabromide derivative.Type: ApplicationFiled: March 5, 2020Publication date: May 26, 2022Applicant: EASTMAN CHEMICAL COMPANYInventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, SUMIT CHAKRABORTY, MICHAEL RICHARD LANINGHAM, VICKIE HAGOOD OSBORNE, LESLIE SHARON DEPEW, ANNETTE ELIZABETH STEVENS, JOHN DEREK WOOLLINS, GUOXIONG HUA
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Publication number: 20220162761Abstract: Method for producing molecular halogen are disclosed, that include the steps of: oxidizing a halide to produce a mixture comprising one or more of a molecular halogen, a trihalide, and a halide; reducing a polysulfide comprising a higher rank polysulfide dianion to produce a lower rank polysulfide dianion; and recovering molecular halogen from the mixture comprising one or more of a molecular halogen, a trihalide, and a halide.Type: ApplicationFiled: March 5, 2020Publication date: May 26, 2022Applicant: EASTMAN CHEMICAL COMPANYInventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, SUMIT CHAKRABORTY, MICHAEL RICHARD LANINGHAM, VICKIE HAGOOD OSBORNE, LESLIE SHARON DEPEW, ANNETTE ELIZABETH STEVENS, JOHN DEREK WOOLLINS, GUOXIONG HUA
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Patent number: 11059722Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.Type: GrantFiled: March 3, 2020Date of Patent: July 13, 2021Assignee: Eastman Chemical CompanyInventors: Scott Donald Barnicki, Robert Thomas Hembre, Elaine Beatrice Mackenzie, Joy Lynn Laningham, Michael Richard Laningham, Shane Kipley Kirk, Larry Wayne Blair, Sumit Chakraborty, Venkateswarlu Bhamidi, Guoxiong Hua, John Derek Woollins
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Patent number: 10829429Abstract: A process for the transesterification of methyl-2-ethylhexanoate with triethylene glycol to produce triethylene glycol di-2-ethylhexanoate is provided. In the process, methyl-2-ethylhexanoate is combined with triethylene glycol to form a first mixture. The first mixture is heated in the presence of a catalyst to form a second mixture comprising methanol and triethylene glycol di-2-ethylhexanoate. Methanol is separated from the second mixture to yield triethylene glycol di-2-ethylhexanoate. Na2CO3, Cs2CO3, K2CO3, Rb2CO3, sodium methoxide or titanium isopropoxide are suitable catalysts.Type: GrantFiled: November 13, 2018Date of Patent: November 10, 2020Assignee: Eastman Chemical CompanyInventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki, David Alan Jenkins
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Publication number: 20200216316Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.Type: ApplicationFiled: March 3, 2020Publication date: July 9, 2020Applicant: EASTMAN CHEMICAL COMPANYInventors: Scott Donald BARNICKI, Robert Thomas HEMBRE, Elaine Beatrice MACKENZIE, Joy Lynn LANINGHAM, Michael Richard LANINGHAM, Shane Kipley KIRK, Larry Wayne BLAIR, Sumit CHAKRABORTY, Venkateswarlu BHAMIDI, Guoxiong HUA, John Derek WOOLLINS
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Publication number: 20200207621Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.Type: ApplicationFiled: March 11, 2020Publication date: July 2, 2020Applicant: EASTMAN CHEMICAL COMPANYInventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, ELAINE BEATRICE MACKENZIE, JOY LYNN LANINGHAM, MICHAEL RICHARD LANINGHAM, SHANE KIPLEY KIRK, LARRY WAYNE BLAIR, SUMIT CHAKRABORTY, VENKATESWARLU BHAMIDI, GUOXIONG HUA, JOHN DEREK WOOLLINS
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Publication number: 20200148619Abstract: A process for the transesterification of methyl-2-ethylhexanoate with triethylene glycol to produce triethylene glycol di-2-ethylhexanoate is provided. In the process, methyl-2-ethylhexanoate is combined with triethylene glycol to form a first mixture. The first mixture is heated in the presence of a catalyst to form a second mixture comprising methanol and triethylene glycol di-2-ethylhexanoate. Methanol is separated from the second mixture to yield triethylene glycol di-2-ethylhexanoate. Na2CO3, Cs2CO3, K2CO3, Rb2CO3, sodium methoxide or titanium isopropoxide are suitable catalysts.Type: ApplicationFiled: November 13, 2018Publication date: May 14, 2020Applicant: Eastman Chemical CompanyInventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki, David Alan Jenkins
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Patent number: 10611637Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.Type: GrantFiled: June 1, 2018Date of Patent: April 7, 2020Assignee: Eastman Chemical CompanyInventors: Scott Donald Barnicki, Robert Thomas Hembre, Elaine Beatrice Mackenzie, Joy Lynn Laningham, Michael Richard Laningham, Shane Kipley Kirk, Larry Wayne Blair, Sumit Chakraborty, Venkateswarlu Bhamidi, Guoxiong Hua, John Derek Woollins
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Patent number: 10590062Abstract: A process for making methyl esters in high yields is provided. The process comprises contacting aliphatic or aromatic aldehydes and methanol with an iron catalyst, to catalyze the dehydrogenative coupling between aliphatic or aromatic aldehydes and methanol. The reaction is highly selective (<99.9%) toward the formation of methyl esters over homoesters and alcohols and operates at temperatures of less than 100° C. for 2-8 hours.Type: GrantFiled: November 13, 2018Date of Patent: March 17, 2020Assignee: Eastman Chemical CompanyInventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Leslie Sharon Depew
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Patent number: 10577305Abstract: A process for making methyl esters in high yields. The process comprises contacting aliphatic or aromatic aldehydes and methanol with a homogeneous dimeric ruthenium catalyst, to catalyze the dehydrogenative coupling between aliphatic or aromatic aldehydes and methanol. The reaction is highly selective (<99.9%) toward the formation of methyl esters over homoesters and alcohols and operates at temperatures of less than 100° C. for 2-8 hours.Type: GrantFiled: November 13, 2018Date of Patent: March 3, 2020Assignee: Eastman Chemical CompanyInventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki, David Alan Jenkins
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Patent number: 10570081Abstract: Disclosed is a process for recovering formic acid from a formate ester of a C3 to C4 alcohol. Disclosed is also a process for producing formic acid by carbonylating a C3 to C4 alcohol, hydrolyzing the formate ester of the alcohol, and recovering a formic acid product. The alcohol may be dried and returned to the reactor. The process enables a more energy efficient production of formic acid than the carbonylation of methanol to produce methyl formate.Type: GrantFiled: July 24, 2018Date of Patent: February 25, 2020Assignee: Eastman Chemical CompanyInventors: Scott Donald Barnicki, Robert Thomas Hembre, Sumit Chakraborty, Gerald Wayne Ollis, Randy Lynn Jennings, Stijn Van de Vyver
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Patent number: 10544077Abstract: Disclosed is a process for recovering formic acid from a formate ester that allows for recovery of a formic acid product comprising greater than 75 wt. % formic acid. Disclosed is also a process for producing formic acid by carbonylating a carrier alcohol, hydrolyzing the formate ester of the carrier alcohol, and recovering a formic acid product comprising greater than 70 wt. % formic acid. Discloses are carrier alcohols that enable more favorable hydrolysis equilibriums and/or distillation sequences.Type: GrantFiled: July 24, 2018Date of Patent: January 28, 2020Assignee: Eastman Chemical CompanyInventors: Scott Donald Barnicki, Robert Thomas Hembre, Sumit Chakraborty, Vickie Haygood Osborne, Michael Richard Laningham, Stijn Van de Vyver
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Patent number: 10435349Abstract: A process for preparing a variety of secondary and tertiary alkyl formate esters via the coupling of methanol and secondary (or tertiary) alcohols. Iron-based catalysts, supported by pincer ligands, are employed to produce these formate esters in high yields and unprecedentedly high selectivities (>99%). Remarkably, the coupling strategy is also applicable to bulkier tertiary alcohols, which afford corresponding tertiary formate esters in moderately high yields and high selectivities.Type: GrantFiled: July 24, 2018Date of Patent: October 8, 2019Assignee: Eastman Chemical CompanyInventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki, Michael Richard Laningham, Gerarld Wayne Ollis, Randy Lynn Jennings
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Patent number: 10266467Abstract: A transfer hydrogenation process for forming vicinal diols by hydrogenating 1,2-dioxygenated organic compounds using alcohols as the reducing agent instead of the traditional H2 gas. The transfer hydrogenation is carried out under milder conditions of temperature and pressure than is typical for ester hydrogenation with H2. The milder conditions of operation provide benefits, such as lower operating and capital costs for industrial scale production as well as savings in product purification due to the avoidance of by-products from exposure of reaction mixtures and products to high temperatures.Type: GrantFiled: July 24, 2018Date of Patent: April 23, 2019Assignee: Eastman Chemical CompanyInventors: Sumit Chakraborty, Robert Thomas Hembre
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Patent number: 10266466Abstract: Iron-based homogeneous catalysts, supported by pincer ligands, are employed in the transfer hydrogenation of esters using C2-C12 alcohols as sacrificial hydrogen donors to produce corresponding alcohols from the esters. No external H2 pressure is required. The reaction can be carried out under ambient pressure.Type: GrantFiled: July 24, 2018Date of Patent: April 23, 2019Assignee: Eastman Chemical CompanyInventors: Sumit Chakraborty, Vikram Seshadri, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki
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Publication number: 20190039984Abstract: Disclosed is a process for recovering formic acid from a formate ester of a C3 to C4 alcohol. Disclosed is also a process for producing formic acid by carbonylating a C3 to C4 alcohol, hydrolyzing the formate ester of the alcohol, and recovering a formic acid product. The alcohol may be dried and returned to the reactor. The process enables a more energy efficient production of formic acid than the carbonylation of methanol to produce methyl formate.Type: ApplicationFiled: July 24, 2018Publication date: February 7, 2019Applicant: Eastman Chemical CompanyInventors: Scott Donald Barnicki, Robert Thomas Hembre, Sumit Chakraborty, Gerald Wayne Ollis, Randy Lynn Jennings, Stijn Van de Vyver
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Publication number: 20190039977Abstract: Iron-based homogeneous catalysts, supported by pincer ligands, are employed in the transfer hydrogenation of esters using C2-C12 alcohols as sacrificial hydrogen donors to produce corresponding alcohols from the esters. No external H2 pressure is required. The reaction can be carried out under ambient pressure.Type: ApplicationFiled: July 24, 2018Publication date: February 7, 2019Applicant: Eastman Chemical CompanyInventors: Sumit Chakraborty, Vikram Seshadri, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki