Saturated Vapor Pressure of Hydrogen Fluoride in the Region of Low Temperatures

Modeling of heat transfer during the desublimation of substances into refrigerated containers

“…3), in case, when the container is filled by 80%. When the container is cooled by the air with the temperature of 135 K, the surface temperature of the desublimate is 145 K. The saturated vapor pressure of hydrogen fluoride is 0.34 Pa [1], which corresponds to the density of hydrogen fluoride of . The mass concentration of hydrogen fluoride in the process stream in the container is reduced by about 300 times.…”

“…To implement the considered separation method, we have used the developed air refrigerating machine. The temperature dependence of the saturated vapor pressure of hydrogen fluoride on temperature was drawn from the experiments [1].…”

Properties of anhydrous hydrogen fluoride in the temperature range from 140 K to 190 K

“…Fig. 3 shows the calculation results on the HF saturated vapor pressure according to the formulas from [3][4][5][6] in the temperature range from 140 K to 160 K. According to the figure, the saturated vapor pressure calculated by the formulas [3][4][5] significantly overestimates the values obtained from the experiments and approximated by the formula (5) [6].…”

“…To determine the pressure of the saturated HF vapor over its solid surface, we have carried out the measurements on the specially designed stand [6]. The obtained formula to determine the dependence of the HF saturated vapor pressure on the pressure in the temperature range of 140K ÷ 190K is:…”

“…Fig. 2 shows the calculation result of the HF saturated vapor pressure by the formulas from [3][4][5][6] in the temperature range of their derivation. It is noteworthy that the slope of the lines 1, 2, 3 is practically the same, but the slope of the line 4 is different.…”