Ethanol-Water Properties

Physical Properties

Ok .... heres my collection of Ethanol-Water physical properties, and some of the correlations that I have derived from them. If you can contribute any usefull data, please e-mail me : Tony.Ackland@comalco.riotinto.com.au

Here's what I've got so far ...(with absolutely bloody no guarantees about its accuracy or correctness !!!)

Basic Data for Ethanol-Water Binary Mix

Physical Properties

Value	Units	Ethanol	Water	Reference
Liquid density	g/mL	0.789	1.000	Perry 3.2
Vapour density @ 90C	g/mL	0.0015	0.001	PV=nRT
Molecular weight	g/mol	46.0634	18.0152	Perry 3.2
Liquid Heat Capacity	J/gK	2.845	4.184	Perry 3-183
Heat of Vapourisation	J/g	855	2260	Perry 3-178
Vapour Pressure @ 90C	torr	1187	525	Perry 13-4
Liquid Viscosity	kg/ms	0.00037	0.00032	Perry 3-252
Vapour Viscosity	kg/ms	108 x 10^-7	125 x 10^-7	Perry 3-311
Surface Tension @ 20C	mN/m	22.39	72.75	Kay & Laby
Vapour Diffusivity ethanol/water	m²/s	?		?
Vapour Diffusivity ethanol/air	m²/s	102 x 10^-7		Perry 3-319
Liquid Diffusivity ethanol/water	m²/s	128 x 10^-11		Perry 3-319

Perry = Perry's Chemical Engineers' Handbook, 6th Ed, 1987, Robert H. Perry & Don Green
Kaye & Laby = Tables of Physical & Chemical Constants, Kaye & Laby, 16th Ed, 1995

Vapour Pressure

log (P_sat) = A - B/(T+C) : P_sat [torr], T [C]
torr x 133.22 = Pa

Perry 13-4

Species	A	B	C
Ethanol	8.1122	1592.864	226.184
Water	8.07131	1730.63	233.426

Heat of Vapourisation

Hv = Ho * ( (1-T/Tc)/(1-To/Tc) ) ^ (A +B(1-T/Tc))

Value	Ethanol	Water
Ho	38743.84	40799.86
Tc	513.9	647.3
A	0.32	0.19
B	-0.14	0.21

Surface Tension

st [mN/m] = 24.05 - 0.0832 x T [^oC] in range 10-70 ^oC

Equilibrium Data

The molar data is from Perry 13-12, I've done the conversions to mass fraction and volume fraction, using the density and molecular weight data above.

Temperature	Mole Fraction		Mass Fraction (g/g)		Volume Fraction (mL/mL)
(C)	Liquid (x)	Vapour (y)	Liquid (x)	Vapour (y)	Liquid (x)	Vapour (y)
95.5	0.019	0.170	0.0472	0.3437	0.0591	0.3990
89	0.072	0.389	0.1657	0.6196	0.2012	0.6736
86.7	0.097	0.438	0.2147	0.6654	0.2573	0.7160
85.3	0.124	0.470	0.2654	0.6943	0.3141	0.7422
84.1	0.166	0.509	0.3374	0.7260	0.3923	0.7705
82.7	0.234	0.545	0.4381	0.7535	0.4971	0.7948
82.3	0.261	0.558	0.4743	0.7635	0.5334	0.8036
81.5	0.327	0.583	0.5544	0.7811	0.6119	0.8189
80.7	0.397	0.612	0.6269	0.8014	0.6804	0.8365
79.8	0.508	0.656	0.7252	0.8301	0.7698	0.8609
79.7	0.520	0.660	0.7346	0.8322	0.7782	0.8628
79.3	0.573	0.684	0.7745	0.8470	0.8132	0.8753
78.74	0.676	0.739	0.8423	0.8784	0.8713	0.9015
78.24	0.747	0.782	0.8831	0.9014	0.9055	0.9206
78.15	0.894	0.894	0.9558	0.9558	0.9648	0.9648

Correlations

Converting these to something useful...

Vapour-Liquid Equilibrium

%vap = -94.7613*x ^ 8 + 450.932 * x ^ 7 - 901.175 * x ^ 6 + 985.803 * x ^ 5 - 644.997 * x ^ 4 + 259.985 * x ^ 3 - 64.5050 * x ^ 2 + 9.71706 * x

where %vap = % of ethanol in vapour if condensed (mL per mL), and x = % of ethanol in liquid (mL per mL).

Temperature

T (in C) = 60.526 * %liq ^ 4 - 163.16 * %liq ^ 3 + 163.96 * %liq ^ 2 - 83.438 * %liq + 100

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At C	Ethanol : J/mol	Water : J/mol
	Ethanol : J/g	Water : J/g