2 replies to this topic

[kalovon]

Hi!
My boss just asked me to find out whether the frozen condensate in a vessel will melt when you put metanol at room temperature inside. Thats all the information I've got.
Please help me, because I'm not sure about this and don't want to tell him something wrong.

[engprocess]

Hi!
My boss just asked me to find out whether the frozen condensate in a vessel will melt when you put metanol at room temperature inside. Thats all the information I've got.
Please help me, because I'm not sure about this and don't want to tell him something wrong.

Hi,
Take a look to this:
Freezing Point of methanol alcohol mixed with water

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Take your Methanol \ Water Mixtures Conctrate to determen the freezing point of your mixture. Winter is here and you should make sure your not going to have a freezzig problem.


Methanol (METHYL ALCOHOL) Conc.
Vol.% ---Freezing Point,F ---Flash Point,F

0----------32f--------No Flash
13---------20f --------130f
24---------0f ---------110f
35---------15f---------95f
46 --------40f---------85f
56---------65f---------75f
66---------95f---------70f
75---------115f--------60f
83---------125f--------55f
92---------130f--------55f
100--------144f--------55f
Other tid bits
Boiling Point: 147F,64C
Melting/Freezing Point: : -144F,-98C
Vapor Pressure: 760 Vapor Density: 1.1
Specific Gravity: 0.8


another information ,
physical properties methanol:
Methanol is a colorless liquid, completely miscible with water and organic solvents and is very hydroscopic. It boils at 64.96° C (148.93° F) and solidifies at -93.9° C (-137° F). It forms explosive mixtures with air and burns with a nonluminous flame. It is a violent poison; drinking mixtures containing methanol has caused many cases of blindness or death. Methanol has a settled odor. Methanol is a potent nerve poison. Key physical properties are:

Melting Point : -97.7 0C

Boiling Point : 65 0C

Relative Density : 0.79

Formula: CH3OH

Molecular weight: 32.042 kg/kmol

Heat of Formation -201.3 MJ/kmol

Gibbs Free Energy -162.62 MJ/kmol

Freezing point: -97.7 °C

Boiling point: 64.6 °C (at atmospheric pressure)

Critical properties:

Critical temperature 512.6 K

Critical pressure 81 bar abs

Critical volume 0.118 m³/kmol

Liquid Properties:

Density 791 kg/m³ at 20 °C

Heat of Vaporization 35278 kJ/kmol

Viscosity:

a = 555.3 b = 260.6

where log(viscosity) = a * ( 1/T - 1/b )

viscosity: mNs/m² T: °K

Vapor Properties:

Heat capacity:

a = 21.152 b = 0.07092 c = 2.59E-05 d = -2.85E-08

where Cp = a + b*T + c*T² + d*T³

Cp: kJ/kmol.K T: °K

Vapour pressure:

a = 18.5875 b = 3626.55 c = -34.29

where ln(P) = a - b/(T+c) P: mmHg; T: °K

within range -16 to 91°C

hope these information will help you

[Zauberberg]

No, the condensate will not melt. Methanol is freezing inhibitor if you mix it with water prior to cooling/chilling. Once when ice is formed, methanol will not help.

The same applies for hydrate inhibition in natural gas processing: injection of hydrate inhibitor should be provided prior to hydrate/ice formation point, and definitely not after.