Critical properties phosgene

I he critical properties of phosgene have been determined expert menially. , x M The method of Vow les has been used to esilmatr the other critical temperatures with a probable ei for of less than 5 C. and live critical densities within 0.01 gramcmilliliter The critical pressures w-erc estimated by the method ol Lvdeison. C [Pg.26]

The critical properties of phosgene have been reviewed elsewhere [1136,1347a,1613, 1614]. The temperature of disappearance of the meniscus was determined to be 181.8 C the temperature of reappearance, 181.6 "C [744]. Although the value was rounded off to 182 C, it is reasonable to assign the value 181.7 "C. The value of 183 C reported by earlier researchers [860] is considered [1613,1614] to have been derived using a method of inferior accuracy on a sample whose purity was not established. 

Only a few of the physical properties of COBrF have been measured. Carbonyl bromide fluoride (relative molecular mass 126.91) is a colourless gas, with an odour similar to, but distinguishable from, phosgene [1195]. The melting point at atmospheric pressure of COBrF has been reported as -120 2 C [1196a], and the boiling point as -20.6 "C [1196a]. Its critical temperature occurs at +124 C, and its critical pressure is ca. 6.18 MPa [656a,1751]. 

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