Phase equilibria, volumetric and compressibility properties of (tetra-n-butylammonium bromide + trisodium citrate) system at temperatures (298.15 K-318.15 K) and atmospheric pressure

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• 作者：Hossein Hooshyar^a ; ^{hooshyar94@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Rahmat Sadeghi^b ; Salah Khanahmadzadeh^a
• 关键词：Aqueous biphasic systems ; Phase diagram ; Tetra-n-butylammonium bromide ; Trisodium citrate ; Apparent molar volume ; Isentropic compressibility
• 刊名：Fluid Phase Equilibria
• 出版年：2016
• 出版时间：15 June 2016
• 年：2016
• 卷：417
• 期：Complete
• 页码：158-165
• 全文大小：589 K

文摘

Liquid−liquid equilibrium data and phase diagram corresponding to new (salt + salt) aqueous biphasic system composed of tetra-n-butylammonium bromide and trisodium citrate were determined by varying temperature and atmospheric pressure. The effects of temperature and salt induced on the binodals and tie-lines of the investigated ATPS were also studied. It was found that an increase in temperature caused the expansion of the two-phase region and increased the slope and the length of the tie line. In order to obtain further evidence about the salting-out effect produced by the addition of trisodium citrate, Na₃Cit to an aqueous solution of water-miscible tetra-n-butylammonium bromide, volumetric and compressibility behavior have been measured at temperatures (298.15 K–318.15 K). The densities and speeds of sound data have been utilized to calculate apparent molar volumes, V_ϕ, the apparent molar isentropic compressibility, κ_ϕ, the values of the apparent molar quantity at infinite dilution, lineImage" height="17" width="17" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0378381216301005-si1.gif">$V_{\varphi }^o$, lineImage" height="17" width="15" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0378381216301005-si2.gif">${\kappa }_{\varphi }^o$ and partial molar characteristics include the volume and compressibility of transfer at infinite dilution, lineImage" height="17" width="34" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0378381216301005-si3.gif">${\Delta }_t{Y}_{\varphi }^o$, TBAB from pure water to the aqueous salt solution.