Preparation of Very Pure Hexafluorobenzene (>99.99 Percent) by Directional Freezing
Hexafluorobenzene of higher purity than the commercially available material was required for gas solubility measurements of a precision of ±0.3%. We considered that a final purity of greater than 99.5% would be satisfactory, Because hexafluorobenzene is costly, we felt that the yield of purified material should be at least 80%. Minimum batch quantities of 300 ml were required for our studies so that the purification procedure was designed to start with 500 ml of the commercial material.
Evans, F. D.,
& Battino, R.
(1968). Preparation of Very Pure Hexafluorobenzene (>99.99 Percent) by Directional Freezing. Analytical Chemistry, 40 (1), 224-226.