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. 2013 Jun 20:2013:819259.
doi: 10.1155/2013/819259. Print 2013.

Liquid-liquid equilibrium of poly(ethylene glycol) 6000 + sodium succinate + water system at different temperatures

Selvaraj Raja  1 , Vytla Ramachandra Murty
Affiliations

Liquid-liquid equilibrium of poly(ethylene glycol) 6000 + sodium succinate + water system at different temperatures

Selvaraj Raja et al. ScientificWorldJournal. .

Abstract

Phase diagrams and the compositions of coexisting phases of poly(ethylene glycol) (PEG) 6000 + sodium succinate + water system have been determined experimentally at 298.15, 308.15, and 318.15 K. The effects of temperature on the binodal curve and tie lines have been studied. The binodal curves were successfully fitted to a nonlinear equation relating the concentrations of PEG 6000 and sodium succinate, and the coefficients were estimated for the formentioned systems (low AARD, high R(2), and low SD). Tie-line compositions were estimated and correlated using Othmer-Tobias and Bancroft equations, and the parameters were reported. The effect of temperature on the phase-forming ability has been studied by fitting the binodal data to a Setschenow-type equation for each temperature. The effective excluded volume (EEV) values were also calculated from the binodal data, and it was found out that the values increased with an increase in the temperature. Furthermore, the effect of MW of PEG on the phase diagram has been studied and verified.

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Figures

Figure 1
Figure 1
Effect of the temperature on the location of binodal curves for the PEG 6000 (W PEG) + sodium succinate (W S) + water systems.
Figure 2
Figure 2
Effect of the cation on the binodal curves for the PEG 6000 (W PEG) + salt (W S) + water systems at 298.15 K.
Figure 3
Figure 3
Binodal curve and tie lines for PEG 6000 (W PEG) + sodium succinate (W S) + water system at 318.15 K.
Figure 4
Figure 4
Setschenow-type plots for the type of salt on binodal curves for the PEG 6000 + sodium succinate + water systems for various temperatures.
Figure 5
Figure 5
Effect of molecular weight of PEG on the binodal curve for the PEG (W PEG) + sodium succinate (W S) + water systems at 298.15 K.
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