Chemical, quasi‐chemical and perturbation theories for associating fluids

Ioannis Economou, Marc D. Donohue

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

Pure fluids and mixtures of species that hydrogen bond behave differently from systems that interact only through dispersion forces. The deviations from classical behavior often are sufficiently large that conventional equations of state and activity models cannot be used without the introduction of large, condition‐dependent empirical parameters. Consequently, three different classes of theories have been developed specifically to treat hydrogen‐bonding systems. The first is based on the assumption that when molecules hydrogen‐bond, they react to form new species and consequently is referred to as “chemical” theory. The second is based on lattice‐fluid theory that is used to describe different types of specific interactions and is known as “quasi‐chemical” theory. The last is based on the solution of integral equations using a potential function that mimics that of a hydrogen bond. It is shown here that these three approaches give essentially equivalent results. This allows one to relate the parameters in the perturbation theory to the equilibrium constant and hence greatly improves its utility for real systems. All three theories are compared with simulation data.

Original languageEnglish
Pages (from-to)1875-1894
Number of pages20
JournalAICHE Journal
Volume37
Issue number12
DOIs
Publication statusPublished - 1991
Externally publishedYes

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Hydrogen
Hydrogen bonds
Fluids
Equilibrium constants
Equations of state
Integral equations
Molecules

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Cite this

Chemical, quasi‐chemical and perturbation theories for associating fluids. / Economou, Ioannis; Donohue, Marc D.

In: AICHE Journal, Vol. 37, No. 12, 1991, p. 1875-1894.

Research output: Contribution to journalArticle

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