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Specific Volume water antifreeze mix

  1. Oct 29, 2013 #1
    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
     
  2. jcsd
  3. Oct 29, 2013 #2

    berkeman

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    Welcome to the PF.

    What is the context of the question? What is the application? Or is this for schoolwork?
     
  4. Oct 29, 2013 #3

    hilbert2

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    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.
     
  5. Oct 29, 2013 #4
    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?
     
  6. Oct 29, 2013 #5

    hilbert2

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