Patents by Inventor Thanikavelu Manimaran
Thanikavelu Manimaran 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: 20170237129Abstract: An electrolyte solution and a flow cell battery are included herein. The electrolyte solution generally includes a zinc bromide electrolyte solution including one or more class A quat halides. The flow cell battery includes an electrolyte solution including one or more class A quat halides.Type: ApplicationFiled: July 10, 2015Publication date: August 17, 2017Inventors: Zhongxin Ge, Thanikavelu Manimaran, Joseph M. O'Day
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Publication number: 20170162898Abstract: An electrolyte solution and a flow cell battery are included herein. The electrolyte solution generally includes a electrolyte solution including one or more class A quat halides. The flow cell battery includes an electrolyte solution including one or more class A quat halides.Type: ApplicationFiled: February 16, 2017Publication date: June 8, 2017Inventors: Zhongxin Ge, Thanikavelu Manimaran, Joseph M. O'Day
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Patent number: 8921624Abstract: A process for the production of an aliphatic bromide in which the bromine atom is attached to a terminal carbon atom, which process comprises continuously feeding olefin having a terminal double bond, gaseous hydrogen bromide, and a molecular oxygen-containing gas into a liquid phase reaction medium comprised of aliphatic bromide to cause anti-Markovnikov addition of HBr to terminal olefin, the feeds being proportioned and maintained to provide a molar excess of hydrogen bromide relative to terminal olefin in the range of about 1 to about 5 percent, and a molar ratio of molecular oxygen to terminal olefin of less than 0.005. The process is especially suited for production of n-propyl bromide.Type: GrantFiled: April 11, 2007Date of Patent: December 30, 2014Assignee: Albemarle CorporationInventors: James E. Torres, Alvin E. Harkins, Jr., Thanikavelu Manimaran, B. Gary McKinnie
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Publication number: 20090054709Abstract: A process for the production of an aliphatic bromide in which the bromine atom is attached to a terminal carbon atom, which process comprises continuously feeding olefin having a terminal double bond, gaseous hydrogen bromide, and a molecular oxygen-containing gas into a liquid phase reaction medium comprised of aliphatic bromide to cause anti-Markovnikov addition of HBr to terminal olefin, the feeds being proportioned and maintained to provide a molar excess of hydrogen bromide relative to terminal olefin in the range of about 1 to about 5 percent, and a molar ratio of molecular oxygen to terminal olefin of less than 0.005. The process is especially suited for production of n-propyl bromide.Type: ApplicationFiled: April 11, 2007Publication date: February 26, 2009Applicant: ALBEMARLE CORPORATIONInventors: James E. Torres, Alvin E. Harkins, JR., Thanikavelu Manimaran, B. Gary McKinnie
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Publication number: 20080279757Abstract: The present invention relates to a method for recovering antimony catalysts wherein the formation of insoluble solids is reduced.Type: ApplicationFiled: July 18, 2008Publication date: November 13, 2008Applicant: Albemarle CorporationInventors: Thanikavelu Manimaran, Alvin E. Harkins, JR.
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Patent number: 7432332Abstract: The present invention relates to a method for recovering antimony catalysts wherein the formation of insoluble solids is reduced.Type: GrantFiled: March 24, 2006Date of Patent: October 7, 2008Assignee: Albermarle CorporationInventors: Thanikavelu Manimaran, Alvin E. Harkins, Jr.
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Publication number: 20080166280Abstract: A process for converting molybdenum technical oxide into a purified molybdenum trioxide product is provided, generally comprising the steps of: combining molybdenum technical oxide with an oxidizing agent and a leaching agent in a reactor under suitable conditions to effectuate the oxidation of residual MoS2, MoO2 and other oxidizable molybdenum oxide species to MoO3, as well as the leaching of any metal oxide impurities; precipitating the MoO3 species in a suitable crystal form; filtering and drying the crystallized MoO3 product; and recovering and recycling any solubilized molybdenum.Type: ApplicationFiled: November 16, 2007Publication date: July 10, 2008Applicant: ALBEMARLE NETHERLANDS B.V.Inventors: Pieter Johannes Daudey, Harmannus Willem Homan Free, Bas Tappel, Parmanand Badloe, Johan Van Oene, Christopher Samuel Knight, Thanikavelu Manimaran
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Publication number: 20080124269Abstract: A process for converting molybdenum technical oxide, partially oxidized MoS2 or off-spec products from MoS2 oxidation processes into a purified molybdenum trioxide product is provided, generally comprising the steps of: combining molybdenum technical oxide with an oxidizing agent and a leaching agent in a reactor under suitable conditions to effectuate the oxidation of residual MoS2, MoO2 and other oxidizable molybdenum oxide species to MoO3, as well as the leaching of any metal oxide impurities; precipitating the MoO3 species in a suitable crystal form; filtering and drying the crystallized MoO3 product; and recovering and recycling any solubilized molybdenum.Type: ApplicationFiled: November 16, 2007Publication date: May 29, 2008Applicant: ALBEMARLE NETHERLANDS B.V.Inventors: PIETER JOHANNES DAUDEY, Harmannus Willem Homan Free, Bas Tappel, Parmanand Badloe, Johan Van Oene, Christopher Samuel Knight, Thanikavelu Manimaran
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Publication number: 20060223949Abstract: The present invention relates to a method for recovering antimony catalysts wherein the formation of insoluble solids is reduced.Type: ApplicationFiled: March 24, 2006Publication date: October 5, 2006Inventors: Thanikavelu Manimaran, Alvin Harkins
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Patent number: 6992148Abstract: A process for brominating a styrenic polymer in an organic solvent in the presence of an antimony trihalide catalyst such that a reaction mass containing brominated styrenic polymer in an organic phase is formed is improved by mixing hydrochloric acid or hydrobromic acid, or both, with said reaction mass at least once to extract antimony catalyst residues from said reaction mass as an acidic aqueous phase. Preferably, catalyst residues are recovered from the acidic aqueous phase and still more preferably, recovered antimony trihalide catalyst residues are recycled to constitute at least a portion of the antimony trihalide catalyst used in preparing the brominated styrenic polymer.Type: GrantFiled: December 31, 2003Date of Patent: January 31, 2006Assignee: Albemarle CorporationInventors: Thanikavelu Manimaran, Alvin E. Harkins, Jr., Samuel H. Dubois, Thomas J. Callender
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Publication number: 20050143528Abstract: A process for brominating a styrenic polymer in an organic solvent in the presence of an antimony trihalide catalyst such that a reaction mass containing brominated styrenic polymer in an organic phase is formed is improved by mixing hydrochloric acid or hydrobromic acid, or both, with said reaction mass at least once to extract antimony catalyst residues from said reaction mass as an acidic aqueous phase. Preferably, catalyst residues are recovered from the acidic aqueous phase and still more preferably, recovered antimony trihalide catalyst residues are recycled to constitute at least a portion of the antimony trihalide catalyst used in preparing the brominated styrenic polymer.Type: ApplicationFiled: December 31, 2003Publication date: June 30, 2005Inventors: Thanikavelu Manimaran, Alvin Harkins, Samuel Dubois, Thomas Callender
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Patent number: 6313355Abstract: Tetrabromobisphenol-A is produced in a bromination process where no bromine or only a very small proportion of bromine is fed to the reactor. In the process aqueous hydrobromic acid, is the sole source or a major source of the bromine. In the process there are at least three concurrent continuous feeds to the reactor. One is composed of bisphenol-A and/or underbrominated bisphenol-A and a water-miscible organic solvent. The second is gaseous hydrogen bromide or preferably, aqueous hydrobromic acid, and the third is aqueous hydrogen peroxide. Optionally a small additional continuous feed of bromine can be employed. The feeds are proportioned to maintain a liquid phase containing (i) from above about 15 to about 85 wt % water, based upon the amount of water and water-miscible organic solvent in such liquid phase, and (ii) an amount of unreacted bromine that is in excess over the stoichiometric amount theoretically required to convert the bisphenol-A and/or underbrominated bisphenol-A to tetrabromobisphenol-A.Type: GrantFiled: July 12, 2000Date of Patent: November 6, 2001Inventors: Thanikavelu Manimaran, Richard A. Holub, Randall S. Barton
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Patent number: 6300527Abstract: This invention relates, inter alia, to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A and/or underbrominated bisphenol-A, which process features: a water and water-miscible organic solvent reaction medium; a relatively high reaction temperature; and the presence, in the reaction medium, of both (i) excess unreacted Br2 during the feed of bisphenol-A to the reactor, and (ii) sufficient HBr to protect the tetrabromobisphenol-A produced against undesirable color formation. Tetrabromobisphenol-A precipitates from the reaction mass and is easily recovered. Product of high purity (97% or more) and very low color (APHA of 50 or less) can be produced, even when using large excesses of bromine in the reaction.Type: GrantFiled: July 12, 2000Date of Patent: October 9, 2001Assignee: Albemarle CorporationInventors: Thanikavelu Manimaran, Hassan Y. Elnagar, Richard A. Holub, Alvin E. Harkins, Jr., Bonnie G. McKinnie
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Patent number: 6235946Abstract: Tetrabromobisphenol-A is produced in a bromination process where no bromine or only a very small proportion of bromine is fed to the reactor. In the process aqueous hydrobromic acid, is the sole source or a major source of the bromine. In the process there are at least three concurrent continuous feeds to the reactor. One is composed of bisphenol-A and/or underbrominated bisphenol-A and a water-miscible organic solvent. The second is gaseous hydrogen bromide or preferably, aqueous hydrobromic acid, and the third is aqueous hydrogen peroxide. Optionally a small additional continuous feed of bromine can be employed. The feeds are proportioned to maintain a liquid phase containing (i) from above about 15 to about 85 wt % water, based upon the amount of water and water-miscible organic solvent in such liquid phase, and (ii) an amount of unreacted bromine that is in excess over the stoichiometric amount theoretically required to convert the bisphenol-A and/or underbrominated bisphenol-A to tetrabromobisphenol-A.Type: GrantFiled: October 12, 1999Date of Patent: May 22, 2001Assignee: Albemarle CorporationInventors: Thanikavelu Manimaran, Richard A. Holub, Randall S. Barton
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Patent number: 6218584Abstract: This invention relates, inter alia, to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A and/or underbrominated bisphenol-A, which process features: a water and water-miscible organic solvent reaction medium; a relatively high reaction temperature; and the presence, in the reaction medium, of both (i) excess unreacted Br2 during the feed of bis-phenol-A to the reactor, and (ii) sufficient HBr to protect the tetrabromobisphenol-A produced against undesirable color formation. Tetrabromobisphenol-A precipitates from the reaction mass and is easily recovered. Product of high purity (97% or more) and very low color (APHA of 50 or less) can be produced, even when using large excesses of bromine in the reaction.Type: GrantFiled: June 10, 1999Date of Patent: April 17, 2001Assignee: Albemarle CorporationInventors: Thanikavelu Manimaran, Hassan Y. Elnagar, Richard A. Holub, Alvin E. Harkins, Jr., Bonnie G. McKinnie
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Patent number: 6147264Abstract: Bisphenol-A or preferably, a mixture of bisphenol-A and underbrominated bisphenol-A, is brominated in a liquid phase reaction medium in which tetrabromobisphenol-A is relatively insoluble, using a stoichiometric deficiency of bromine to thereby form in the reaction mass a precipitate (i.e., a solids phase) composed of 50-95 wt % of tetrabromobisphenol-A and 50-5 wt % of underbrominated bisphenol-A. The precipitate is separated from the reaction mass, preferably during the bromination, and tetrabromobisphenol-A is recovered from the precipitate. Preferably underbrominated bisphenol-A is recycled as feed to the bromination. The process technology of this invention has the capability of producing high quality tetrabromobisphenol-A (high purity, good color, low ionic halide content) with efficient raw material utilization, minimized waste product formation, and minimized waste disposal costs.Type: GrantFiled: April 8, 1999Date of Patent: November 14, 2000Assignee: Albemarle CorporationInventors: Thanikavelu Manimaran, Richard A. Holub, Randall S. Barton
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Patent number: 5847202Abstract: Optically active carboxylic acids, salts or esters, such as the profen-type compounds, are racemized in the presence by nitrogenous bases such as methylbenzylamine by heating an aqueous solution of such optically active compounds in the presence of a suitable excess of an alkali metal hydroxide relative to the amount optically active carboxylic compound present in the solution. The process not only enables conversion of inactive or undesirable enantiomers of compounds such as naproxen or ibuprofen into a usable, desirable enantiomers in an efficient and economical manner, but avoids conversion of the nitrogenous base into amide. Thus the deleterious consequences of amide formation are avoided.Type: GrantFiled: October 22, 1997Date of Patent: December 8, 1998Assignee: Albemarle CorporationInventors: Robert E. Young, Hao V. Phan, Thanikavelu Manimaran, Ronald C. Zumstein
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Patent number: 5498800Abstract: A process is disclosed for obtaining a compound of the formulaAr-Z IIwhere Ar, R.sub.1 and R.sub.2 are defined in the specification and Z is --C(R.sub.3).dbd.CH.sub.2 or --CH(R.sub.3)CHO where R.sub.3 is defined in the specification. The process utilizes a heterogeneous mixture of the compound of formula I and an alkali or alkaline earth metal in dimethylformamide. The mixture is subjected to ultrasonic vibrations for a time and at a temperature sufficient to produce a compound of formula II: ##STR1## where Ar, R.sub.1, and R.sub.2 are defined above and X is the halo group.Type: GrantFiled: January 9, 1995Date of Patent: March 12, 1996Assignee: Albemarle CorporationInventor: Thanikavelu Manimaran
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Patent number: 5442117Abstract: A process for obtaining a substantially pure enantiomer of an hydrocarbyl amine is described. The process utilizes first an enantiomerically enriched mixture the of hydrocarbyl amine obtained from kinetic resolution, diastereomeric crystallization or asymmetric synthesis processes. This enriched mixture is reacted with an inorganic acid producing a salt that has the following properties:1) has at least one eutectic point;2) a composition that is not at the eutectic point; and3) a eutectic composition that is closer to the racemiccomposition than is the eutectic composition of saidhydrocarbyl, or be a solid where the salt is a liquid. A substantially pure, enantiomeric salt is separated, leaving a mother liquor comprising the solvent and the hydrocarbyl amine enriched in the other enantiomer.Type: GrantFiled: December 13, 1993Date of Patent: August 15, 1995Assignee: Albemarle CorporationInventors: G. Patrick Stahly, Thanikavelu Manimaran
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Patent number: 5315027Abstract: A process for preparing alkyl esters of ibuprofen is provided. A 1-halo-1-(4-isobutylphenyl)ethane is reacted in an anhydrous medium with carbon monoxide in the presence of an alkoxide source at a temperature between about 10.degree. C. and about 200.degree. C. An excess of several moles of alcohol is preferred. An acid such as hydrogen chloride may also be added. As catalyst, a palladium compound having at least one acid-stable ligand is present; however, an excess of ligand over palladium is advantageous.Type: GrantFiled: May 11, 1993Date of Patent: May 24, 1994Assignee: Ethyl CorporationInventors: Thanikavelu Manimaran, Tse-Chong Wu, Felix M. Orihuela