Phase stability analysis using interval Newton method with NRTL model

Hatice Gecegormez, Yasar Demirel

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


The Gibbs energy minimization using activity coefficient models and nonlinear equation solution techniques are commonly applied for phase stability problems. However, dependence on the initial estimates and multiple solutions for these highly nonlinear equations are common drawbacks for some of the conventional approaches. We have used interval Newton method with the local composition model of NRTL for the phase stability analysis of 10 binary systems and 2 ternary systems at various feed compositions to locate all the stationary points. Results indicate that the interval Newton method is reliable and efficient.

Original languageEnglish (US)
Pages (from-to)48-58
Number of pages11
JournalFluid Phase Equilibria
Issue number1-2
StatePublished - Oct 25 2005
Externally publishedYes


  • Interval Newton method
  • NRTL model
  • Phase stability

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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