75-43-4Relevant articles and documents
Hydrogenolysis of carbon-chlorine bonds in carbon tetrachloride and trichlorofluoromethane in the presence of catalytic quantities of tris(triphenylphosphine) ruthenium(II) dichloride
Xie, Shaofeng,Georgiev, Emil M.,Roundhill, D. Max,Troev, Koljo
, p. 39 - 44 (1994)
The hydrogenolysis of carbon tetrachloride to chloroform, and of trichlorofluoromethane to hydrodichlorofluoromethane, are catalyzed by the complexes RuCl2(PPh3)3 and RuCl2(dppe)2.The conversion of carbon tetrachloride into chloroform is more complete than the conversion of trichlorofluoromethane into hydrodichlorofluoromethane.Key words: Ruthenium; Hydrogenolysis; Carbon-chlorine bonds; Homogeneous catalysis
Chain photoreduction of CCl3F induced by TiO2 particles
Calhoun,Winkelmann,Mills
, p. 9739 - 9746 (2001)
Fluorotrichloromethane (CFC 11) is dehalogenated through a reductive chain reaction upon illumination of aqueous, air-free suspensions of TiO2 particles in the presence of formate ions. The reduction takes place with large photonic efficiencies at pH a?￥ 5 even at high photon fluxes, producing mainly Cl- and dichlorofluoromethane (HCFC 21), while F- is only a minor byproduct. In the proposed mechanism .CO2- and .CCl2F radicals are the chain carriers, Cl- as well as HCFC 21 result from propagation steps, and cross-termination of the chain carriers forms F-. Simple steady-state assumptions, that regard propagations as the dominant steps, yield kinetic equations consistent with the data of the initial fast Cl- formation step. The subsequent evolution of rates and postirradiation effects are consequences of the slow removal of electrons from the semiconductor.
Interaction of trichloromethane and tetrachloromethane with nitrogen trifluoride
Mukhortov,Pashkevich,Blinov,Kambur,Kambur,Petrov,Kurapova
body text, p. 420 - 426 (2011/08/04)
Interaction of nitrogen trifluoride with trichloromethane and tetrachloromethane at temperatures in the range from 20 to 200°C and pressures of up to 6.0 MPa in the gas and liquid phases was studied.
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.
