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Analysis of fatty acid‐ethylene oxide adducts by countercurrent distribution
Author(s) -
Wetterau F. P.,
Olsanski V. L.,
Smullin C. F.,
Brandner J. D.
Publication year - 1964
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02654821
Subject(s) - ethylene oxide , fractionation , chemistry , ethylene glycol , fatty acid , solvent , stearate , chromatography , oxide , polyol , polymer , countercurrent distribution , organic chemistry , adduct , countercurrent exchange , copolymer , polyurethane , physics , thermodynamics
Countercurrent distribution (CCD) has been found to be a very satisfactory means for the direct determination of free polyol, monoester and diester in a wide range of fatty acid‐ethylene oxide adducts in which the average polyoxyethylene (POE) chain length varies from 1舑40 ethylene oxide units. A suggested procedure with three solvent systems, providing optimum separation over the entire scope of products, is presented in this paper. Several fatty acid‐ethylene oxide derivatives were analyzed and good separations were obtained as indicated by well‐defined wt distribution curves. The results on POE‐8‐stearate verify earlier conclusions that the product consists of unesterified POE glycols and POE glycol mono‐ and diesters in the approximate molar proportions of 1蝘2蝘1. CCD was also used to effect partial fractionation of the monoester according to POE chain length. The fractionation, although incomplete, is sufficient to permit estimation of polymer distribution.