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An analytical expression for the fugacity coefficient of supercritical fluids

Parsafar, G. A ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1068/htjr122
  3. Publisher: Old City Publishing , 2003
  4. Abstract:
  5. An analytical expression for the fugacity coefficient of supercritical fluids has been derived from the equation of state. Here, the equation of state known as the linear isotherm regularity, LIR, is used to obtain this expression. We have inverted the LIR equation of state to obtain an appropriate expression for fugacity calculation. The inverted LIR (ILIR) works well at high pressures; but at high temperatures, Tr = T/Tc ≥2, ILIR is valid for the entire pressure range. ILIR is valid over a wide temperature range. Unlike LIR, ILIR is also valid at temperatures above twice the Boyle temperature. Like LIR, the inverted equation is a general equation of state which is valid for all types of fluids. The derived expression for the fugacity coefficient obeys well the principle of corresponding states. Therefore we may calculate the fiigacity of a gas in any thermodynamic state if its critical pressure and temperature along with its potential parameters are known. However, for Tr ≥ 2, at which the ILIR works well over the entire pressure range, only the critical parameters are needed for such a calculation
  6. Keywords:
  7. Effluent treatment ; Temperature ; Supercritical fluids
  8. Source: High Temperatures - High Pressures ; Volume 35-36, Issue 5 , 2003 , Pages 529-539 ; 00181544 (ISSN)