United States Patent Office Faiented Vay 27, 1958 2 Substantially All of the Hydrogen Chioride Is Removed Therefrom
2,336,622 United States Patent Office Faiented Vay 27, 1958 2 substantially all of the hydrogen chioride is removed therefrom. With respect to the reactants usei in this process, the 2,336,622 phosgene car be preformed or it can be formed in situ PREPARATION OF CARBONY, FIUOR);E from carbon monoxide and chlorine which, as is weli Charles W. Tullock, Winnington, Dei., assig or its E. H. known, combine readily at elevated temperature to give iil Pont de Nemours and Conpany, Wii Saiigioia, Bei, phosgene. When this is done, the carbon monoxide is a corporation of Delaware preferably, though not necessarily, used in excess over the amount calculated to react with the chlorine. Simi No Drawing. Appication February 13, 1955 :) larly, the hydrogen fluoride can be used preformed, as the Seria No. 489,294 substantially anhydrous material, or if desired, it can be prepared in situ by employing approximately equivalent 10 Claims. (C. 260-544) amounts of a strong, substantially anhydrous acid such as sulfuric acid or hydrogen chloride and of an alkaline or This invention relates to a new process for preparing alkaline earth metal fluoride, such as Sodium or calcium fluorine-containing organic compounds. in particular, it fuoride. This embodiment is not preferred, however, be relates to a new process for preparing carbonyl fluoride. cause of the additional difficulties encountered in mixing It has recently been discovered that valuable fluorocar the reactants and in separating the reaction product from bons, including tetrafluoroethylene, can be synthesized in solid by-products. Another method of forming both very good yields by reacting carbonyl fluoride with car d phosgene and hydrogen fluoride in situ involves reacting bon at high temperatures, for exampie, by bringing car together formaldehyde, chlorine and a metal fluoride, bonyl fluoride in contact with the carbon electrodes of e.g., calcium fluoride.
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