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specific mass of ethanol in vapor phase
3

specific mass of ethanol in vapor phase

specific mass of ethanol in vapor phase

(OP)
Hello, I'm looking for data on :
- the specific mass of ethanol in vapor phase at boiling temeperature.
- emissivity of ethanol,
- combustion rate of ethanol.
Could you please help me?
Thanks.

RE: specific mass of ethanol in vapor phase

TEMPERATURE DEG F         172.9252    
PRESSURE    PSIA          14.69600    
VAPOR FRACTION            1.000000    

PROPERTIES                 TOTAL        VAPOR                                      
-----------------------  ----------  ----------  
Ethanol
MOLECULAR WT.               46.0680     46.0680
ENTHALPY BTU/LBMOLE       2196.5766   2196.5766
ENTROPY  BTU/LBMO/R          3.9709      3.9709
CP       BTU/LBMOL/R                    17.9022
CV       BTU/LBMOL/R                    15.8045
CP/CV                                    1.1327
DENSITY  LB/FT3                        0.101325
Z-FACTOR                               0.984370
VISCOSITY   CP                         0.007293
TH.COND  BTU/FT/HR/F                   0.010062

Not familiar with combustion rate, do you mean flame rate at stochimetric?


RE: specific mass of ethanol in vapor phase


safetystudies:

As a point of interest to augment dcasto's response , the density of a gas can easily be calculated by using this equation derived from the universal gas law:

lb/ft3 = (MW)(P)/[(z)(10.73)(deg R)]

where:
MW = Molecular weight of the gas
P = absolute pressure of the gas, in psia
Z = compressibility factor
deg R = absolute gas temperature = 460 + deg F

For your ethanol at atmospheric pressure and 173 deg F:

lb/ft3 = (46.07)(14.696)/[(0.984)(10.73)(460 + 173) = 0.1013
 
=======================================

In SI metric units:

kg/m3 = (MW)(P)/[(z)(8.3144)(deg K)]

MW = Molecular weight of the gas
P = absolute pressure of the gas, in kPa
Z = compressibility factor
deg K = absolute gas temperature = 273.15 + deg C

For your ethanol at atmospheric pressure and 78.4 deg C:

kg/m3 = (46.07)(101.325 kPa)/[(0.984)(8.3144)(273.15 +78.4) = 1.623

Milton Beychok
(Visit me at www.air-dispersion.com)
.

RE: specific mass of ethanol in vapor phase


As for vapor density it seems dimers and tetramers don't seem to affect the estimated/reported values. Any comment ?

RE: specific mass of ethanol in vapor phase

(OP)
Thank you very much for your help, I've been searching hours without success for those data..
My main web source for chemical data is the Nist Webbook.
Do you know any other free source where I can find these kind of data?
Sincerely yours.
Cédric.

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