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(Vapour + liquid) equilibria of (water + dimethylformamide): application of the headspace-gas chromatography for the determination of thermodynamic interactions

✍ Scribed by C. Barth; R. Horst; B.A. Wolf

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
180 KB
Volume
30
Category
Article
ISSN
0021-9614

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✦ Synopsis

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Isothermal measurements of the partial vapour pressures have been carried out on water q Ž .4 dimethylformamide DMF at temperatures between T s 305.15 K and T s 323.15 K using an apparatus composed of a headspace sampler and a normal gas chromatograph. These data Ž were simultaneously evaluated in one step with respect to the composition dependent, . integral Flory-Huggins interaction parameter g by means of a new method which minimizes the Gibbs energy of mixing and does not require chemical potentials. The expression for g given by Koningsveld and Kleintjens, originally designed for polymer solutions, describes the present results best.

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