Preparing From Elemental Carbon, Inorganic Carbide, Carbon Disulfide, Or Carbon Oxide Patents (Class 570/240)
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Publication number: 20120157691Abstract: A practical and efficient method for halogenation of activated carbon atoms using readily available N-haloimides and a Lewis acid catalyst has been disclosed. This methodology is applicable to a range of compounds and any halogen atom can be directly introduced to the substrate. The mild reaction conditions, easy workup procedure and simple operation make this method valuable from both an environmental and preparative point of view.Type: ApplicationFiled: February 24, 2012Publication date: June 21, 2012Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Yanhua ZHANG, Hisashi YAMAMOTO, Kazutaka SHIBATOMI
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Patent number: 8188324Abstract: A process for the preparation of 11C methyl iodide comprises coating the internal surface of a first reaction vessel with a solution of lithium aluminum hydride, wherein the first reaction vessel has an internal diameter not greater than about 1.5 mm; introducing 11C carbon dioxide into the first reaction vessel such that it is reduced by the lithium aluminum hydride to give a reduction product; and reacting the reduction product with hydriodic acid.Type: GrantFiled: March 23, 2006Date of Patent: May 29, 2012Assignee: Hammersmith Imanet LimitedInventor: David Robert Turton
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Publication number: 20100041928Abstract: The fullerenic structures include fullerenes having molecular weights less than that of C60 with the exception of C36 and fullerenes having molecular weights greater than C60. Examples include fullerenes C50, C58, C130, and C176. Fullerenic structure chemically bonded to a carbon surface is also disclosed along with a method for tethering fullerenes to a carbon material. The method includes adding functionalized fullerene to a liquid suspension containing carbon material, drying the suspension to produce a powder, and heat treating the powder.Type: ApplicationFiled: October 19, 2009Publication date: February 18, 2010Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Anish Goel, Jack B. Howard, John B. Vander Sande
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Patent number: 7276635Abstract: A process is provided for the production of a methyl halide by reacting carbon monoxide, hydrogen, and hydrogen halide over a catalyst to give methyl halide and carbon dioxide. The reaction is carried out under anhydrous conditions by using a ratio of carbon monoxide to hydrogen of 2-2.5:1. The catalyst contains a metal from the group copper and zinc. High conversion and yields are obtained in the process.Type: GrantFiled: September 10, 2004Date of Patent: October 2, 2007Inventor: John E. Stauffer
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Patent number: 6958422Abstract: The present invention relates to the pyrolysis of hydrochlorofluorocarbons to form fluoromonomers such as tetrafluoroethylene, the pyrolysis being carried out in a reaction zone lined with nickel and mechanically supported by a jacket of other corrosion resistant metal, the nickel lining providing an improved yield of valuable reaction products.Type: GrantFiled: December 17, 2003Date of Patent: October 25, 2005Assignee: E. I. du Pont de Nemours and CompanyInventors: Charles Joseph Noelke, Velliyur Nott Mallikarjuna Rao
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Patent number: 6924403Abstract: The present invention relates to the process of pyrolyzing tetrafluoroethylene to hexafluoropropylene by carrying out the pyrolysis in a tubular reactor that is lined with either nickel or nickel alloy which contains no greater than 8 wt % chromium.Type: GrantFiled: May 7, 2003Date of Patent: August 2, 2005Assignee: E. I. du Pont de Nemours and CompanyInventors: John James Barnes, Kenneth Paul Kelch, Thomas D. Sandbrook, David John Van Bramer
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Patent number: 4962247Abstract: This invention relates to a process for continuously producing halogenated hydrocarbons by: (1) flowing a feed mixture containing CO, H2 and a halogen source into a reaction zone containing a catalyst bed; (2) removing from the reaction zone the resultant reaction product which contains the desired halogenated hydrocarbons; and (3) maintaining the halogen source content in the feed mixture at from about the stoichiometric amount to about twice the stoichiometric amount needed to produce the halogenated hydrocarbons.Type: GrantFiled: January 10, 1989Date of Patent: October 9, 1990Assignee: The Dow Chemical CompanyInventors: Michael T. Holbrook, Timothy Juhlke
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Patent number: 4845064Abstract: Catalysts for the preparation of alkyl halides produced by reacting (1) transition metal carbonyl complex capable of oxidatively adding H.sub.2 or HCl and (2) a Lewis acid from the group consisting of aluminum halides, antimony halides and mixtures thereof, with an adsorbent solid containing surface hydroxyl groups, in a solvent.Type: GrantFiled: January 6, 1987Date of Patent: July 4, 1989Assignee: University of FloridaInventors: Russell S. Drago, Cindy S. Goldstein
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Patent number: 4734535Abstract: Aliphatic chlorine compounds of the formulaX--R.sup.1 --Cl Iwhere R.sup.1 is alkylene which may be interrupted by one or more oxygen atoms and which may be substituted by halogen, alkyl or aryl, and X is hydrogen, chlorine or OR.sup.2, where R.sup.2 is alkyl, cycloalkyl, aryl or aralkyl, are prepared by decarboxylating chloroformic acid esters or diesters at elevated temperatures by decarboxylating in the presence of a quaternary ammonium or phosphonium salt as catalyst.Type: GrantFiled: March 25, 1987Date of Patent: March 29, 1988Assignee: BASF AktiengesellschaftInventors: Norbert Greif, Knut Oppenlaender
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Patent number: 4538011Abstract: Method of preparing methyl halides over mixtures of methyl halides with halogenated ethanes by reaction between carbon monoxide, hydrogen and a hydrogen halide in the presence of a metal carbonyl complex catalyst at a temperature below 200.degree. C.Type: GrantFiled: April 24, 1984Date of Patent: August 27, 1985Assignee: University of FloridaInventors: Russell S. Drago, James G. Miller, Keith D. Weiss