Propylene Glycol

SMD Posted By SMD, Mar 14, 2019 at 12:02 PM

  1. SMD

    SMD
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    Hi,

    I'm looking into a high temperature application for my Woodgun E250. I want to fill the boiler with about 80/20 propylene glycol to water mix. Then run it at 300F, circulating the hot glycol through pans to boil water. (Maple sap for a maple syrup operation.)

    Does anyone have experience running proplyene glycol in their boiler at high temperature?

    Thanks,

    Andrew
     
  2. peakbagger

    peakbagger
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  3. SMD

    SMD
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    Thanks, that's excellent information. Is the high limit 300F?
     
  4. peakbagger

    peakbagger
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    Looks to me to be 350 F. There are some exotic heat transfer fluids that will go higher.
     
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  5. NateB

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    What if you used your Woodgun to get the temp up to 180 - 190 with water, and a fuel and burner to do the rest? Putting a poisons liquid through a pipe that is in a edible liquid would make me very nervous. What would be cool is a wood gas burner.
     
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  6. maple1

    maple1
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    I guess I will say it in this thread too. I am about 95% sure doing something like this will lead to disappointment of some sort. And now talking about glycol in such close contact with a food product is extra bad mojo.
     
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  7. peakbagger

    peakbagger
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    Polypropylene Glycol is relatively safe compared Ethylene glycol. Its used as food additive and any one that ever have colonoscopy had to chug down a gallon of it. Not sure on the toxicity of the inhibitors.
     
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  8. maple1

    maple1
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    Dont think I'd want it any where near my maple. :confused:
     
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  9. S.Whiplash

    S.Whiplash
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    This is a better method IMO, it uses the wood boiler within the constraints of it's design and does not void the warranty. I have seen a Polar G-3 used in conjunction with a NG boiler to purify honey in this way and the whole operation works very well and does not contravene safety standards in any way.
     
  10. SMD

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    Propylene glycol is edible. Really, though, if the glycol is getting into the syrup, that means a ruptured heat exchanger, and I have problems way beyond glycol in my syrup!

    Thanks all for the input, very helpful.
     
  11. maple1

    maple1
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    Making maple syrup takes waaay more energy than purifying honey. Huge amounts more. Which is why this whole thing IMO would end in disappointment.
     
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  12. NateB

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    Chances are your HX will not rupture, but will get a pin hole leak, and will mix in to your maple syrup slowly. By the time you figure out it is leaking, how many gallons have you processed? I know the government says its ok to eat, but I would not want it in my syrup, and are you will to list it as an ingredient on the label when you have a leak?
     
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  13. maple1

    maple1
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    If maple syrup gets to the public with anything like that in it, you would have problems way beyond a leaky HX.
     
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  14. SMD

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    I couldn't agree more on comments on glycol in syrup. Absolutely unacceptable.

    This is a research project, and the conclusion may very well be that it's a bad idea.

    Again, thanks all for you input!
     

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