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Liquid-Liquid and Liquid-Liquid-Solid Equilibrium of the Poly(ethylene glycol) Dimethyl Ether 2000 + Sodium Sulfate + Water System
2008 (English)In: Journal of Chemical and Engineering Data, ISSN 0021-9568, E-ISSN 1520-5134Article in journal (Refereed) Published
Abstract [en]

The phase diagram for the poly(ethylene glycol) dimethyl ether (PEGDE) + Na2SO4 + H2O system at298.15 K using PEGDE with a molar mass of 2000 was determined. Compositions of the liquid-liquid and the liquid-liquid-solid equilibria were determined using calibration curves of refractive index of the solutions, and atomic absorption (AA) and X-ray diffraction analyses were made on the solids. The solid phase in equilibrium with the biphasic region was anhydrous Na2SO4. An empirical nonlinear three-parameter expression developed by Merchuk was used for reproducing the experimental binodal data at T ) (288.15,298.15, 308.15, and 318.15) K, and the fitting parameters were obtained for the corresponding temperatures.The effects of temperature on the binodal curve were also studied, and it was observed that the area of the biphasic region increased slightly with an increase in temperature. The experimental tie-line compositions at the aforementioned temperatures were fitted to both the Othmer-Tobias and Bancroft and Setschenowtypeequations. Correlation coefficients for all equations are reported.

Place, publisher, year, edition, pages
2008.
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:ltu:diva-61919OAI: oai:DiVA.org:ltu-61919DiVA: diva2:1073223
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2017-02-09

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Nikjoo, Dariush
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