Specific Volume water antifreeze mix

[andyhol]

What is the expansion change of a 50-50 mix of water and antifreeze as the mixture goes from liquid to gas. If possible both Propylene glycol and Ethylene glycol; but, I am not picky, either would be extremely appreciated.

Many Thanks
Andy

 

[berkeman]

What is the expansion change of a 50-50 mix of water and antifreeze as the mixture goes from liquid to gas. If possible both Propylene glycol and Ethylene glycol; but, I am not picky, either would be extremely appreciated.

Many Thanks
Andy

Welcome to the PF.

What is the context of the question? What is the application? Or is this for schoolwork?

 

[hilbert2]

Ethylene glycol can not boil at normal atmospheric pressure. If you heat it enough, it just gives off a huge amount of smoke and decomposes to form other compounds. You might get it in gas phase with vacuum distillation, though.

 

[andyhol]

Berkeman -
It is not for school work, I'm too old for that :-) It is for an idea/concept that I have, that I would prefer not to post here.
If water froze at a lower temp it would be ideal in my application. My application will go from liquid to steam, do to heat, be reclaimed cooled too liquid and then the process repeats. I need the expansion rate close to water (1600 times) and it needs to be a quick change. Was hoping a 50/50 mix with antifreeze might come close.

Hilbert2- I saw a materiel spec sheet that said it flashed at something like 480 F. If mixed with water does it still burn/decompose?

 

[hilbert2]

Hilbert2- I saw a materiel spec sheet that said it flashed at something like 480 F. If mixed with water does it still burn/decompose?

If the mixture is heated, the water boils off first and when there's only glycol left, it starts decomposing.