A segment contribution method for the vapor pressure of tall-oil chemicals

Costas P. Bokis, Chau Chyun Chen, Hasan Orbey

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


A segment-contribution method for the estimation of vapor pressure of large, oligomeric molecules encountered in oleochemical industry is described. The method makes use of segment composition, number of segments, and four parameters per segment to estimate vapor pressure as a function of temperature. For major components that occur in crude tall-oil (CTO) distillation, the optimum parameters are reported and the method is shown to be accurate. The open architecture of this segment contribution approach permits the use of new segments, or the treatment of whole molecules as segments if necessary.

Original languageEnglish
Pages (from-to)193-203
Number of pages11
JournalFluid Phase Equilibria
Issue number2
StatePublished - Feb 25 1999


  • Oleochemicals
  • Oligomers
  • Segment-contribution method
  • Tall-oil
  • Vapor pressure


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