Search for functions that model temperature dependencies of internal pressure of associated liquids

Abstract

This article considers three-parameter Morse and Rydberg functions as models for temperature dependencies of internal pressure of n-alcohols (n-propanol, n-butanol, n-decanol) 10–90 °С temperature range, diols (ethylene glycol, 1,3-propanediol) and monoethanolamine within the 5–60 °С temperature range. The Morse function models temperature dependencies for objects under analysis with deviation within the thermodynamic calculation error of internal pressure. The Rydberg function successfully models temperature dependencies of n-butanol, n-decanol, diols and monoethanolamine, but not n-propanol. To better model temperature dependencies of n-propanol the article states a modified variant of the Rydberg function.