IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Heptane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Heptane; C7H16; [142-82-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Connolly, J.F., J. Chem. Eng. Data 1966, 11, 13-6.

Variables:
   Temperature = 295-355 °C
   Pressure = 170-700 atm

Prepared By:
   M.C. Haulait-Pirson

Experimental Data:   (Notes on the Nomenclature)

Solubility of heptane in water
t/°C	Pressure [atm]	Pressure (compiler) [MPa]	g₁/100 g solution	Mole Fraction x₁ (compiler)
295	170	17.22	1.1	0.0020
295	250	25.32	1.1	0.0020
295	500	50.65	1.1	0.0020
295	700	70.91	1.1	0.0020
330	200	20.26	3.3	0.0061
330	300	30.39	3.3	0.0061
330	500	50.65	3.3	0.0061
350	195	19.75	3.7	0.0069
350	210	21.27	5.7	0.0107
350	260	26.34	9.6	0.0187
350	280	28.36	10.0	0.0196
350	310	31.40	9.6	0.0187
350	370	37.48	8.1	0.0156
350	550	55.72	5.7	0.0107
355	230	23.30	10.3	0.0202
355	240	24.31	13.5	0.0273
355	250	25.32	19.5	0.0417
355	245	24.82	24.7	0.0557
355	320	32.42	41.7	0.1139
355	310	31.40	35.7	0.0885
355	300	30.39	29.3	0.0693
355	300	30.39	24.8	0.0559
355	305	30.90	19.5	0.0417
355	345	34.95	13.5	0.0273
355	390	39.51	10.3	0.0202

Method/Apparatus/Procedure:
   The cloud point method was used. Measurements were carried out in a 100 mL stainless-steel cell. The cell was loaded with 15 g (2) and brought to temperature. Mixing was started and (1) was injected, until either a cloud or a small portion of a second phase appeared at the top of the cell. Then mercury was injected to change the pressure, more (1) was injected and the procedure was repeated.

Source and Purity of Materials:
   (1) Phillips reagent grade; better than 99.8%; used as received.
   (2) distilled and deaerated.

Estimated Errors:
   Solubility: ± 2 atm (accuracy)
   Temperature: ± 0.02 K