Studies on vacuum condensing point (V. C. P.) in sublimatography (1).

Sublimatographic separation of mixed system. I.

Abstract

V. C. P. in sublimatography was studied to establish the sublimatographic separation of mixed systems. When sublimed vapor condensed and crystallized on the wall of a glass tube with temperature gradient, a certain critical point of condensation had been obtained. The ratio γ=P_h/P_c, where P_h was the pressure of vapor phase and P_c. was the saturated vapor pressure at the critical point temperature had a significance and showed a characteristic value for each substance.
The mean values of γ for mercuric chloride, mercuric bromide, mercuric iodide, stannic iodide, arsenic trioxide and phosphorus pentoxide were 1.50, 1.40, 1.72, 1.42, 1.79 and 1.99, respectively.