Abstract
The effusion method was used to determine the vapour pressure of tetrachloroisophthalonitrile at 13 temperatures in the range 90-145 degrees C, with a minimum of two results at each temperature. Measured vapour pressures were in the range 1-135 mTorr and are expressed by the following equation for the solid phase of this compound: lg p=12.65-5652.84/T), where p is the vapour pressure in Torr and T is the absolute temperature in K. The 95% confidence limits for the respective constants of the equation are +or-0.3 and +or-122. The average difference between the raw data and the fitted values was 3.4%. Experimental conditions studied included effusion hole diameter and effusion time. The compound undergoes no phase change or decomposition below approximately 167 degrees C, at which temperature there is a solid phase transformation. All the results are for the phase stable below 167 degrees C.
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