Measurement and correlation of liquid-liquid equilibria for dextranpoly(ethylene glycol)water aqueous two-phase systems at 20°C

Takeshi Furuya, Yoshio Iwai, Yoshiaki Tanaka, Hirohisa Uchida, Sunao Yamada, Yasuhiko Arai

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The liquid-liquid equilibria (LLE) for the dextranpoly(ethylene glycol)water aqueous two-phase systems with various polymer molecular weights were measured at 20°C. The molecular weight distributions of dextran (DEX) and poly(ethylene glycol) (PEG) in the PEG-rich phase (top phase) and DEX-rich phase (bottom phase) were also measured. To take into account deviations from random mixing, the interaction term of the conventional Flory-Huggins equation was empirically modified. The molecular weight distribution of DEX was expressed by a Γ distribution function because the DEX sample used showed a wide molecular weight distribution though the PEG samples were almost monodispersed. LLE and molecular weight distributions were correlatet successfully using a continuous thermodynamic approach.

Original languageEnglish
Pages (from-to)119-141
Number of pages23
JournalFluid Phase Equilibria
Volume103
Issue number1
DOIs
Publication statusPublished - Jan 16 1995

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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