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MOLECULAR SIEVES

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MOLECULAR SIEVES  

 

  • APPLICATION:
    • In dehydration of ethanol, 3A Zeolite is used to absorb the water content from the ethanol.
      • Ethanol molecules are 4.4 Angstroms in diameter.
      • Water molecules are 2.8 Angstroms in diameter.
  • It is this size-sorting property of the zeolite that is responsible for the “sieve” term.

Robert Warren Wrote :

  • So, the thing you need to know next for making E85 is that you will need to remove the last 5 or 10% of water by a process called a molecular sieve.
  • I know this sounds technical, but it is pretty simple, and cheap, too.
  • A sieve is a strainer. The finer the screen, the finer the final product will be, as when you are sifting flower to remove any clumps or large particles.
  • You can buy Zeolyle, which is a granulated product that will absorb water but not the slightly larger ethanol molecules.
  • You need to specify that you want to buy the 3 A size (3 angstrom), as this is what you need for making 200 proof ethanol.
  •  Buy Type 3A in 10lb bags (looks like a small pea gravel) it is only a couple of bucks and it works very well to dehydrate the ethanol.
  • We mix about 5 lbs in a 5 gallon can and let it sit with the ethanol overnight and pour the dehydrated ethanol through a screen, into another can the next day.
  • To get the water out of the zeolite we just broil it on the backyard grill - it is reusable indefinitely.
  • Or, you can dry it in the sun by spreading it on a tarp in the summer months.
  • Finally, you measure that you do really have 200 proof with a hydrometer.
  • If you still have some water in your alcohol, it will separate out and settle to the bottom when you mix it with gasoline.
  • Also, you should strain your 200 proof through a fine screen just to make sure you don’t have any zeolite particles that will clog up your fuel filter.
    • Robert Warren

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2006 Gilles Desormeaux