IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ethanol with 2,4,4-Trimethyl-1-pentene (alpha-diisobutylene) and Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 2,4,4-Trimethyl-1-pentene (alpha-diisobutylene); C8H16; [107-39-1]  NIST Chemistry WebBook for detail
   (3) Ethanol (ethyl alcohol); C2H6O; [64-17-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Kretschmer, C.B.; Wiebe, R., Ind. Eng. Chem. 37, 1130 (1945).

Variables:
   Temperature = 228 K - 298 K

Prepared By:
   A. Skrzecz

Experimental Remarks:

   Water tolerance (S) was described with probable error <0.5% at the range -45-25 °C by the equation: log(S)=a-b/(T/K). The parameters (a,b) were determined from plots. Water tolerance was defined as: S=H₂O% by volume · (100 - Hydrocarbon % by volume in the blend)/100.

vol % hydrocarbon            a               b
75                 1.400        340.3
50                 1.842       355.4

Experimental Data:   (Notes on the Nomenclature)

Compositions along the saturation curve
t/°C	T/K	Mass Fraction w₁ (compiler)	Mass Fraction w₂ (compiler)	Mole Fraction x₁ (compiler)	Mole Fraction x₂ (compiler)
-45.0	228.2	0.5127	0.4619	0.6682	0.2471
-45.0	228.2	0.2671	0.7219	0.4515	0.5010
0.0	273.2	0.5021	0.4523	0.6242	0.2309
0.0	273.2	0.2648	0.7158	0.4355	0.4832
25.0	298.2	0.4954	0.4463	0.5984	0.2213
25.0	298.2	0.2634	0.7120	0.4258	0.4725

Method/Apparatus/Procedure:
   A glass tube with stirrer containing the ternary mixture was immersed in a bath, the temperature of which could be varied. Mixtures were prepared directly in the tube, by special pipettes at 15.5°C. Precautions to exclude moisture and to prevent evaporation were observed. No correction was made for the slight expansion in volume when alcohol was mixed with hydrocarbon. In the paper the experimental results were expressed as the water tolerance of the alcohol-hydrocarbon blend. For practical purposes water tolerance was defined as the volume percent of water which can be added before separation occurs.

Source and Purity of Materials:
   (1) Source not specified; anhydrous ethanol.
   (2) Source not specified.
   (3) Source not specified.

Estimated Errors:
   Solubility: Not reported.
   Temperature: Temp. within about 0.3°C (duplicate determinations); composition <0.2% relative of volume fraction.