1963 Volume 36 Issue 6 Pages 629-632
The rate of iodine permeation through graphite has been studied and the following results were obtained:
(1) The process of iodine permeation through graphite has been found to consist mainly of a simple gas flow through the pore volumes, just as in the case of inert gases. The chemical interaction between iodine and graphite has been observed to be negligibly small.
(2) At tempeatures ranging from 90 to 160°C, and under a corresponding pressure of iodine vapor below 400 mmHg the rate of iodine permeation has been observed to be almost linearly proportional to the pressure of iodine. It has been concluded that the Knudsen flow was the predominant element of the total flow.
(3) The ratio of the flow rates for air and iodine, which were interpolated to the value under the same conditions, has been calculated to be 2.68∼2.85, close to the value 2.96, namely (MI2/Mair)1⁄2, as was expected from the Knudsen flow model.
(4) The rate of iodine permeation has been observed to decrease in the presence of argon gas, even in the region of Knudsen flow. It has been found that the rate is roughly inversely proportional to the pressure of argon gas. The “ dusty gas model ” discussed by Evans et al. has been adapted to give a reasonable explanation of this phenomena.
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