75-45-6Relevant articles and documents
2-Chloro-2,2-difluoracetamide (ClF2CC(O)NH2). Thermal decomposition, vapour infrared, mass spectrometry, low-temperature NMR, and theoretical studies. Solvent effects on conformational preferences
Iriarte, Ana G.,Cutin, Edgardo H.,Auergello, Gustavo A.
, p. 1366 - 1372 (2011)
Gas-phase thermal decomposition of 2-chloro-2,2-difluoracetamide (CDFA) was studied at temperatures between 270 and 290°C. The rate constant for the decomposition follows the Arrhenius equation. k = (5.5 ± 0.3) · 1016s-1 exp [-(104±4)kj mol-1/RT] Mass spectrometry was used to analyze the decomposition pattern of the title compound. The FT-IR spectrum of the vapour phase and the infrared spectra of CDFA in protic and aprotic solvents were recorded. Potential energy surfaces were studied by theoretical calculations performed at the density functional theory level (PBEPBE and B3LYP methods) using the 6-31G*, 6-31+G*, 6-311+G**, aug-cc-pVDZ, and aug-cc-pVTZ basis sets. CSIRO 2011.
Selective reduction of a C–Cl bond in halomethanes with Et3GeH at nanoscopic Lewis acidic Aluminium fluoride
Mei?ner, Gisa,Feist, Michael,Braun, Thomas,Kemnitz, Erhard
, p. 234 - 241 (2017/09/12)
The selective activation of C–Cl bonds of hydrochlorofluoromethanes and chloromethanes at moderate reaction conditions using ACF in a combination with Et3GeH is presented. The reactions of the chloromethanes (CH3Cl, CH2Cl2, CHCl3 and CCl4) in the presence of Et3GeH and ACF as catalyst led to the activation of only one C–Cl bond resulting in the hydrodechlorination. Friedel-Crafts reactions with benzene as solvent are suppressed by Et3GeH. A selective hydrodechlorination of hydrochlorofluoromethanes was achieved, because a transformation of a C–F bond into a C–H bond by the combination of ACF with Et3GeH did not occur. Supporting PulseTA experiments illustrated the interaction between the solid catalyst and Et3GeH, the solvent benzene or CH2Cl2.
A trifluoro methane resource utilization method
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Paragraph 0019; 0028-0063, (2017/08/25)
The invention discloses a method for resource utilization of fluoroform. The method is characterized by mixing fluoroform with one or a plurality of halohydrocarbon, converting the mixture into a product containing monochlorodifluoromethane in the presence of a catalyst, and reacting unreacted fluoroform with other reaction products in a reactor. According to the method, chlorofluorocarbon containing chlorine or bromine or chlorofluorocarbon which contains chlorine or bromine and needs to be processed during a production process is utilized as reaction material to perform chlorine/fluorine exchange reaction with fluoroform to prepare monochlorodifluoromethane, better economic benefits and social benefits are provided; and in products, monochlorodifluoromethane can be recycled though separation, remained waste gas does not need to be processed, and can still enter the reactor as gas reacted with fluoroform, the conversion rate of reactants is improved, and zero-discharge is realized.
A combination of three fluoromethane cracking process for preparing
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Paragraph 0025; 0026; 0030, (2017/02/24)
The invention provides a technique for preparing monochlorodifluoromethane by decomposing trifluoromethane. The technique comprises the steps of: feeding the raw materials trifluoromethane and methane chloride into a reactor filled with a catalyst in the mol ratio of 0.1-10, and carrying out a decomposition reaction at a temperature ranging from 150 to 350 DEG C for 3-30 seconds to obtain a mixture of trifluoromethane, methane chloride, dichloromonofluoromethane and monochlorodifluoromethane; obtaining monochlorodifluoromethane directly through separation, reacting dichloromonofluoromethane separated out with hydrogen fluoride to produce monochlorodifluoromethane, and separating out and recovering trifluoromethane and methane chloride in the mixture as the reaction mixture continuously. The method has the advantage that the harm on the environment caused by trifluoromethane emission is greatly avoided.
The use of active carbon pretreated at 2173 K as a support for palladium catalysts for hydrodechlorination reactions
Bonarowska, Magdalena,Raróg-Pilecka, Wioletta,Karpiński, Zbigniew
body text, p. 223 - 231 (2012/02/03)
A commercial active carbon was heat-treated at 2173 K in argon and then subjected to steam gasification, yielding a series of very pure, turbostratic carbon materials, characterized by different specific surface areas and pore volume. These materials served as supports for palladium catalysts. Their pore structure, apparent absence of oxygen containing functional groups and hydrophobic character have a great effect on the dispersion of palladium introduced by impregnation. The use of an acetone solution of palladium acetate rather than an aqueous solution of palladium chloride (a typical Pd precursor) for the impregnation gives better results for preparing more metal dispersed Pd/C catalysts, especially for carbons with smaller micropore volumes. All preheated carbon-supported palladium catalysts showed very good activity and selectivity to CH2F2 in CCl2F2 (CFC-12) hydrodechlorination, up to 90% at the highest reaction temperature. In contrast, untreated or only HCl-washed carbons showed inferior catalytic properties. Residual phosphorus in the active carbons which were present in the active carbons which have not been subjected to thermal treatment, appears to be responsible for deterioration of catalytic properties of Pd/C. After reaction the presence of interstitial carbon (originating from the CFC-12 molecule) in the Pd lattice was found in the catalysts characterized by lower and medium metal dispersions.
Process for the manufacture of hydrochlorofluorocarbons using trifluoromethane as fluorinating agent
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Page/Page column 5-6, (2010/04/25)
The present invention provides a process for the manufacture of hydrochlorofluorocarbons comprising treating a hydrocarbon substituted with one or more chlorine atoms and optionally one or more fluorine atoms under elevated temperature with GHF3.
PROCESS FOR THE MANUFACTURE OF CHLORODIFLUOROMETHANE
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Page/Page column 20-22, (2008/06/13)
A process is disclosed for the manufacture of CHClF2 which involves contacting CHCl3, HF and pentavalent antimony catalyst in the liquid phase; passing reactor vapor effluent to a reflux column to produce a reflux column vapor effluent of CHClF2 and HCl; passing the reflux column vapor effluent to a condenser to produce a condenser liquid effluent of CHClF2 and a condenser vapor effluent of CHClF2 and HCl; passing the condenser liquid effluent to the reflux column upper end; and recovering CHClF2 from the condenser vapor effluent. The concentration of CHCl2F and CHF3 in the condenser vapor effluent is controlled by: (i) controlling the temperature at a point within the lower third of the theoretical stages of the reflux column by controlling the heat input to the reactor liquid phase; (ii) controlling the pressure in the reactor, reflux column and condenser by controlling the rate at which the condenser vapor effluent is removed from the condenser; (iii) maintaining the reflux ratio of the condenser at a substantially constant value; and (iv) maintaining the reactor liquid phase at substantially the maximum mass that does not result in entrainment or flooding of the reflux column. Also disclosed is CHClF2 which is a product of this process. Also disclosed is a refrigerant comprising CHClF2 and a method for its manufacture, a polymer foam blowing blend comprising CHClF2 and a method for its manufacture, fluoromonomers tetrafluoroethylene and hexafluoropropylene produced by using CHClF2 and a method for their manufacture, and a fluoropolymer produced by using CHClF2 as a fluoromonomer precursor and a method for its manufacture; all involving the manufacture of CHClF2 in accordance with the above process.
Methane and methyl chloride as selective reducing agent in the transformation of hydrochlorofluorocarbons or chlorofluorocarbons to hydrofluorocarbons
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Page/Page column 6-7, (2008/06/13)
A gas phase reaction process for producing a hydrofluorocarbon from a hydrochlorofluorocarbon or chlorofluorocarbon reactant by contacting, in the presence of a catalyst, the hydrochlorofluorocarbon or chlorofluorocarbon reactant with a reducing agent selected from methane, methyl chloride and mixtures thereof, to produce the hydrofluorocarbon.
Nitrogen trifluoride as an oxidative co-reagent in high temperature vapor phase hydrofluorinations
Belter, Randolph K.,Sweval, Mark S.,Iikubo, Yuichi
, p. 816 - 820 (2008/03/27)
Nitrogen trifluoride (NF3) has proven to be a useful additive in high temperature vapor phase hydrofluorination reactions of chlorocarbons. The activity of chromium-based catalysts is maintained by introducing a co-stream of NF3 into the reagent chlorocarbon and HF stream. NF3 is a desirable additive instead of O2 as there is no water generation due to its use.
PYROLYSIS PROCESS
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Page/Page column 4-5, (2008/06/13)
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.
