Fluorides of Group 16 elements

Although it was not identified as such at the time, the first report of a material which could have been carbonyl chloride fluoride appeared in 1919 [992]. The reaction (oft explosive) between phosgene and difluorine at 200 C, in the presence of calcium fluoride, produced a liquid which boiled at ca. -42 C [992]. The product was thought, at the time [992], to be a mixture of COF and dichlorine, but the proximity if its boiling point to that of COCIF is too close for coincidence. 

A mixture of calcium fluoride ( fluorspar 0.08 mol), potassium chloride (0.1 mol) and phosgene (0.14 mol), maintained at 500 C and about 3.4 MPa over a period of 63 h, gave a mixture consisting of COCIF, COFj and unconverted COCl. The solid residue consisted of a CaClj.KCl phase no CaFj.CaCl was detected, and 79% of the CaF was converted. Under similar conditions, maintained over 24 h, 67% of the CaF was converted and, after 4 h. 

66% COCIF, 2.8% COFj and 31.2% COClj. The solid residue was found to be substantially 

The passage of gaseous phosgene (1.4 1 h ) through a tubular reactor containing CaF, 

THE REACTION OF PHOSGENE WITH CaFj/KCl IN A FLOW-SYSTEM [1561] 

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