specific mass of ethanol in vapor phase 3

[safetystudies]

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.

 

[dcasto]

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?

 

[mbeychok]

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)
.

 

[25362]

For assessment of data with pool fires the following calculator may be of help:

http://users.wpi.edu/~ierardi/FireTools/pool_fires.html

 

[25362]

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

 

[safetystudies]

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.