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Separation of water from air at high temperature

  1. Jul 8, 2011 #1
    How might one try to separate water from air at high temperature (say, 75degC) - if the gas if fully saturated?
    I understand that you should try to cool it down first to do so, but other than putting it though a heat exchanger is there any other approach you can take?
  2. jcsd
  3. Jul 8, 2011 #2


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    One could introduce a material that reacts with and sequesters water (i.e., a desiccant).
  4. Jul 8, 2011 #3
    Hmm..thanks for the reply.
    If I'm interested in separating that water and re-using it in a loop (where at the outlet it will once again be a fully saturated gas), how do you think I could here use a desiccant/deliquescent material for the purpose of that separation?

    Hope I make sense.
  5. Jul 9, 2011 #4
    Watching ABC1 TV Science Doco [Catalyst] just last week, I will try to sum up:-

    By observing the incredible marvels of nature (o:)Praise God), have you noticed how beetles and other insects are always squeaky clean in a dusty, dirty and muddy environment?

    Having a close look at the surface of these insects, scientist have learnt the principles of how they collect water out of the air, - the water gathers into a bubble and runs off the body of the insect taking all impurities with it.

    So now they have developed a nano material which does the same thing, and have seriously proposed this technology as a water collecter in dry deserts - for human use.

    You will have to google this if you want to find out more.
  6. Jul 9, 2011 #5
    Why would the air be cooled first? Can't you just stick a cold spongy object in the hot, saturated air to suck the water out of it?
  7. Jul 10, 2011 #6
    I'm just saying that by cooling down the hot saturated gas, more water will condense at a lower temperature.

    Oh and thanks for the beetle example, although i'm not sure that kind of recent material technology will be available to me in my problem!
  8. Jul 11, 2011 #7
    Can a venturi scrubber be used to separate water particles from a hot air stream? I don't really know how these devices work but I know they can separate particles from gas.
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