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Supercritical Fluid Metal Halide Separation Process.
U S Pat 4 853 205 1989 Aug; :
A supercritical fluid is used to selectively separate, purify, and recover metal halides. Thus, 54.5 G of a mixture containing 15.9 pct ticl4 and 84.1 pct alcl3 was placed in an autoclave and supercritical co2 at 53 deg c and 1,550 psig was passed through the mixture for approximately 30 min. Supercritical co2 carrying dissolved ticl4 was removed continuously during the 30 min and was depressurized by expanding it through a needle valve. Liquid ticl4 was collected in a flask. At the end of the test, 3.15 G of liquid had collected, containing 99.3 pct ticl4 and 0.7 pct alcl3. The solid alcl3 residue in the autoclave contained no detectable ticl4.
U.S. Pat. 4,853,205, Aug. 1, 1989