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An ebulliometer for measurements of vapour pressure at low temperatures: the vapour pressures and the critical state of perfluoromethylcyclopentane

✍ Scribed by M.B. Ewing; J.C. Sanchez Ochoa

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 149 KB
Volume: 30
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1997.0290

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✦ Synopsis

Comparative ebulliometry has been used to determine the vapour pressures of Ž . Ž perfluoromethylcyclopentane between T s 260 K, p s 10.6 kPa and T s 434 K, p s . 1590 kPa . The measurements at low temperatures were made using a new stainless steel ebulliometer with a condenser that automatically adjusted its temperature to the required value. Another set of stainless steel ebulliometers, with conventional water condensers, were used at high pressures. In addition, the critical temperature T s 451.44 K and pressure c p s 2171.8 kPa were determined using the static method. The three sets of results were c correlated by an equation of the Wagner type with a standard deviation of 72 Pa in the vapour pressure.

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