Activity coefficients phthalate

Bendova, M., Rehak, K.. Matous, J., and Novak, J.P. Liquid + liquid equilibrium in the ternary systems water + ethanol + dialkyl phthalate (dimethyl, diethyl, and dibutyl phthalate) at 298.15 K, /. Chem. Eng. Data, 46(6) 1605-1609, 2001. Benes M. andDohnal, V. Limiting activity coefficients ofsome aromatic and aliphatic nitrocompounds in water, / Chem. Eng. Data, 44(5) 1097-1102, 1999. 

Illustrative Example 5.1 Deriving Liquid Aqueous Solubilities, Aqueous Activity Coefficients, and Excess Free Energies in Aqueous Solution from Experimental Solubility Data Problem Calculate the Cf (L), yf 1 and G of (a) di-n-butyl phthalate, (b) y-1,2,3,4,5,6-hexachlorocyclohexane (y-HCH, lindane), and (c) chloroethene (vinyl chloride) at 25 °C using the data provided in Appendix C. 

Table 11.2 contains some data that exemplify the above comments. It cites values of the activity coefficient for an ester (benzyl acetate), an alcohol (heptan-2-ol) and a terpene (limonene) in different environments encompassing a range of polarities water (highly polar), an aqueous surfactant (as used in shampoos) and a moderately polar solvent used in perfumery (diethyl phthalate, DEP). It can be seen that heptanol and limonene have values of y in DEP, which are similar and also greater than that of benzyl acetate, but in water limonene has a very large activity coefficient. Limonene is not able to participate in any strong cohesive interactions with water molecules, and the high y is a consequence... 

Liu et al. prepared a procaine-sensitive FET transducer by coating a suitable electrode with sodium tetraphenylborate-procaine active material, 5% of poly(vinylchloride), and dibutyl phthalate in tetrahydrofliran [71]. The optimum operating pH was determined to be between 2 and 7. The transducer was applied in the potentiometric titrimetric determination of procaine in injection solution, where the recovery was 100.7% and the coefficient of variation (n = 2) was 1.4%. 

Table n.. Mean Soleent Activity Coeffidents at Indicated Volume FractionB NP of Squalane (SO) Dinonyl Phthalate (DNP) at 30 Ct Calculated from End-Point n-Alkane Solute Partition Coefficients of TaUe I and Equation 2Z... 

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