Liquid−Liquid Equilibrium in the System Poly(ethylene glycol) + MgSO₄ + H₂O at 298 K

Abstract

The liquid−liquid equilibrium for the ternary systems PEG1000 + MgSO4 + H2O, PEG3350 + MgSO4 + H2O and PEG8000 + MgSO4 + H2O has been obtained experimentally. The results are fitted to a three-parameter equation which fits the results to within ±2%. Tie lines have also been measured, along with the viscosity and density in both phases. The tie-line compositions have been fitted to Bancroft's potential equation.

Liquid‐Liquid Equilibrium of Poly(Ethylene Glycol) 6000 + Sodium Succinate + Water System at Different Temperatures

“…The tie-line compositions of the PEG 6000 + sodium succinate + water fitted with Othmer-Tobias equation (4) and Bancroft equation (5) [30, 31] $\begin{array}{c}\left(\frac{\mathrm{1}-W_{\text{PEG}}^t}{W_{\text{PEG}}^t}\right)=K_{\text{OT}}{\left(\frac{\mathrm{1}-W_{\text{S}}^b}{W_{\text{S}}^b}\right)}^n,\end{array}$ $\begin{array}{c}\left(\frac{W_{\text{W}}^b}{W_{\text{S}}^b}\right)=K_B{\left(\frac{W_{\text{W}}^t}{W_{\text{PEG}}^t}\right)}^r,\end{array}$ where W W is the weight fraction of water and K OT , n , K B , and r are the fitted parameter coefficients. For the present system, these values are calculated and given in the Table 6.…”

(Liquid+liquid) equilibrium of (NaNO3+PEG 4000+H2O) ternary system at different temperatures

“…The binodal curve was determined using a turbidimetric method [28], adding small quantities of NaNO 3 or PEG (0.001 g, approximately) to the respective aqueous solution then this solution is shaken and sets to constant temperature by some minutes, this procedure is repeated until the characteristic change in turbidity appeared, indicative of the formation of a second liquid phase. All the solutions were maintained at working temperatures (±0.1 K) in a temperature controlled bath.…”

(Liquid+liquid) equilibrium of (NaClO4+PEG 4000+H2O) ternary system at different temperatures

“…The binodal curve was determined using a turbidimetric method [25], adding small quantities of NaClO 4 or PEG (0.001 g, approximately) to shaken 10 g solutions of each phase until the characteristic change in turbidity appeared, indicative of the formation of a second liquid phase. All the solutions were maintained at working temperatures (±0.1 K) in a temperature controlled bath.…”