Acetone Vapor pressure vs boiling point
Acetone Vapor pressure vs boiling point
(OP)
The following data is of Acetone Boiling Point at different pessures.
-59.4 1 torr
-40.5 5 torr
-31.1 10 torr
-9.4 40 torr
-2 60 torr
7.7 100 torr
22.7 200 torr
39.5 400 torr
46 500 torr
51 600 torr
55 700 torr
At my location ATM pressure is 727 mmHg. when I apply vacuum and gauge display 680 mmHg that would mean 47 mmHHg pressure remains. Acetone should boil between -9.4 to -2 oC. whereas it does not do so.
To boil acetone at 680 mmHg we keep Temp between 50-55 oC.
Are we supplyng more heat than required?
Am I missing something.
Even If we take Latent heat(29.48 Kj/mol at 680 mmHg) in consideration , Can't we vaporize acetone at room temperature(25-30 oC)?
Thanks
Saleda.
-59.4 1 torr
-40.5 5 torr
-31.1 10 torr
-9.4 40 torr
-2 60 torr
7.7 100 torr
22.7 200 torr
39.5 400 torr
46 500 torr
51 600 torr
55 700 torr
At my location ATM pressure is 727 mmHg. when I apply vacuum and gauge display 680 mmHg that would mean 47 mmHHg pressure remains. Acetone should boil between -9.4 to -2 oC. whereas it does not do so.
To boil acetone at 680 mmHg we keep Temp between 50-55 oC.
Are we supplyng more heat than required?
Am I missing something.
Even If we take Latent heat(29.48 Kj/mol at 680 mmHg) in consideration , Can't we vaporize acetone at room temperature(25-30 oC)?
Thanks
Saleda.





RE: Acetone Vapor pressure vs boiling point
RE: Acetone Vapor pressure vs boiling point
The value of 680 mm Hg shown on the gauge is absolute pressure, that is why it matches up with the boiling point data points you typed in.
There is no correction factor to be added or subtracted here.
Regards
StoneCold
RE: Acetone Vapor pressure vs boiling point
RE: Acetone Vapor pressure vs boiling point
Good luck,
Latexman
RE: Acetone Vapor pressure vs boiling point
Now that is what confusing me....
If you have refered to the data I have typed above then as the reading in Gauge decreses with that boiling point decreases, then why should I install heavy Vacuum Pump and achieve maximum vacuum achiievable.
At 680 mmHg boiling is at 50-55 oC
At 400 mmHg boiling is at 40-42 oC ? ?
Please clearify...
Thanks
Saleda
RE: Acetone Vapor pressure vs boiling point
Good luck,
Latexman
RE: Acetone Vapor pressure vs boiling point
log Psat = A - B/(T+C)
P in torr, T in oC
A=7.11714
B =1210.595
C = 229.664
Range of applicability: from -13 to +55oC.