IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ethanol with Mesitylene (1,3,5-trimethylbenzene) and Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Ethanol (ethyl alcohol); C2H6O; [64-17-5]  NIST Chemistry WebBook for detail
   (3) Mesitylene (1,3,5-trimethylbenzene); C9H12; [108-67-8]  NIST Chemistry WebBook for detail

Evaluator:
   A. Skrzecz, Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland (1997.05)

Critical Evaluation:

      A survey of reported compositions along the saturation curve (sat), and compositions of coexisting phases in equilibrium (eq.) for the system ethanol-mesitylene-water is given in Table 39.

Saturation Curve The ternary system ethanol-mesitylene-water forms a miscibility gap of type 1. Data for the system were reported in two references and are evaluated on the basis of the original papers. Only one binary system mesitylene-water forms a miscibility gap. This system was compiled and critically evaluated in a previously published SDS volume.³ The recommended value at 298 K is x'₂=7.4·10^–6; solubility of water in mesitylene was not reported. The miscibility gap reported by Bonner¹ at 273 K is larger than the one at 298 K, which is in agreement with general expectation. Experimental errors estimated by the evaluator are ±0.0005 mole fraction for data reported in Ref. 1. The authors of Ref. 2 estimated their errors at 0.005 mole fraction for the binodal curve and 0.01 mole fraction for tie line compositions. Mutual solubility data for the misytylene-water system reported at 298.2 K together with the ternary data,² are x'₂=0.000 and x"₂=0.999. They differ significantly from recommended values but are within the accuracy of experimental measurements. Data are consistent within each data set as well as between sets and are considered tentative. Data reported at 298.2 K by Letcher et al.² were described by the equation: x₁=0.935 36+0.113 49 ln(x₂)–0.889 03x₂–0.049 05x²₂. The parameters were calculated by the least-squares method and the standard error of estimate was 0.0082. Selected points on the saturation curve, calculated by the above equation together with the recommended value of Ref. 3 are presented in Table 40.

Phases in equilibrium Equilibrium data for the ternary system ethanol-mesitylene-water was reported at 298.2 only by Letcher et al.² They are consistent within the series. The plait point calculated by the authors (Ref. 2) was x₁=0.50, x₂=0.35, while the maximum concentration of ethanol on binodal curve was x₁=0.60. The plait point reported by Bonner at 273.2 K¹ was x₁=0.517, x₂=0.400. The experimental data for phase equilibria are treated as tentative and are presented together with experimental points on saturation curve in Fig. 20 .

Experimental Data: (Notes on the Nomenclature)

TABLE 39. Summary of experimental data for the system ethanol-mesitylene-water
Author	T/K	DataType	Reference
Bonner, 1909	273	sat. (10)	1
Letcher et al., 1992	298	sat. (15), eq. (7)	2

TABLE 40. Calculated compositions along the saturation curve at 298.2 K
T/K	Mole Fraction x₁	Mole Fraction x₂
298.2	0.0000	7.4 Ref. 3
298.2	0.1505	0.0010
298.2	0.4038	0.0100
298.2	0.4736	0.0200
298.2	0.5344	0.0400
298.2	0.5625	0.0600
298.2	0.5773	0.0800
298.2	0.5846	0.1000
298.2	0.5873	0.1200
298.2	0.5868	0.1400
298.2	0.5839	0.1600
298.2	0.5791	0.1800
298.2	0.5729	0.2000
298.2	0.5656	0.2200
298.2	0.5572	0.2400
298.2	0.5480	0.2600
298.2	0.5381	0.2800
298.2	0.5276	0.3000
298.2	0.5165	0.3200
298.2	0.5050	0.3400
298.2	0.4930	0.3600
298.2	0.4806	0.3800
298.2	0.4679	0.4000
298.2	0.4549	0.4200
298.2	0.4415	0.4400
298.2	0.4279	0.4600
298.2	0.4140	0.4800
298.2	0.3999	0.5000
298.2	0.3856	0.5200
298.2	0.3710	0.5400
298.2	0.3563	0.5600
298.2	0.3414	0.5800
298.2	0.3263	0.6000
298.2	0.3111	0.6200
298.2	0.2956	0.6400
298.2	0.2801	0.6600
298.2	0.2644	0.6800
298.2	0.2485	0.7000
298.2	0.2325	0.7200
298.2	0.2164	0.7400
298.2	0.2002	0.7600
298.2	0.1839	0.7800
298.2	0.1674	0.8000
298.2	0.1509	0.8200
298.2	0.1342	0.8400
298.2	0.1174	0.8600
298.2	0.1005	0.8800
298.2	0.0835	0.9000
298.2	0.0665	0.9200
298.2	0.0493	0.9400
298.2	0.0321	0.9600
298.2	0.0147	0.9800
298.2	0.0060	0.9900
298.2	0.0000	0.9990 Ref. 2

View Figure 1 for this Evaluation

Notes:
Table 39  Number of experimental points in parentheses.

References: (Click a link to see its experimental data associated with the reference)

   1  Bonner, W.D., J. Phys. Chem. 14, 738 (1909-1910).
   2  Letcher, T.M.; Siswana, P.M., Fluid Phase Equilib. 74, 203 (1992).
   3  Shaw, D.G., ed., Solubility Data Series, Vol. 37, Hydrocarbons with Water and Seawater, Part I: Hydrocarbons C8 to C36 (Pergamon, New York, 1989).