Supercritical Fluid Fractionation of a Nonionic Surfactant

Charles A. Eckert, Michael P. Ekart, Barbara L. Knutson, Kirk P. Payne, David L. Tomasko, Charles L. Liotta, Neil R. Foster

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Supercritical fluid extraction (SFE) is demonstrated for the removal of unreacted dodecanol (lauryl alcohol) from nonionic surfactants (poly(oxyethylene) dodecyl ethers, C1En) and fractionation based on polymer chain length. Carbon dioxide, pure and with 1.0 and 3.5 mol % methanol cosolvent, propane, and ammonia were used as supercritical solvents. Experimental solvent loadings and distribution coefficients were used to develop a batch extraction model and continuous stagewise extraction model. Propane and ammonia exhibited higher loadings while the CO2/methanol mixtures showed greater selectivity for removing the dodecanol and C1E1. Conclusions regarding the choice of solvent for specific separations are discussed.

Original languageEnglish
Pages (from-to)1105-1110
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Issue number4
StatePublished - 1992

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Industrial and Manufacturing Engineering


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