Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

So2 removal from water

  1. Feb 21, 2007 #1
    hiii i want a method to saparate water from so2 ?
     
  2. jcsd
  3. Feb 21, 2007 #2

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    In water SO2 forms sulfurous acid. The most straightforward way to remove it is to pass the water/H2SO3 through an anion exchange column loaded with hydroxide. Pure water will be formed and the resin will trap the SO3-2.

    If the SO2 concentration is high, adding lime to the water will precipitate most of it out. Blowing air (containing CO2) through the solution will largely neutralize the water and precipitate most of the calcium out. It will also remove iron. The resulting water will be saturated in calcium carbonate and you might want to soften it... or not.
     
  4. Feb 21, 2007 #3

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    From the wording of the OP, it seems zooz wants to separate water (vapor?) from SO2, not vice versa.

    Zooz: you need to provide more specifics.
     
  5. Feb 21, 2007 #4
    yeah i meant removing so2 gas from water vapour
     
  6. Feb 21, 2007 #5

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Are you trying to dry an SO2 stream (remove water from SO2) or strip SO2 from water vapor (removing SO2 gas from water vapor)?
     
  7. Feb 21, 2007 #6
    removing SO2 gas from water vapour
     
  8. Feb 22, 2007 #7

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Pass the vapor through a heated column of a solid base such as barium hydroxide. Keep the temperature high enough so that water does not condense.

    SO2 scrubbers are used in coal-fired power plants to remove SO2 from the exhaust. The exhaust is sprayed with a slurry of calcium carbonate or lime or a liquid solution of sodium hydroxide. Heat is usually added to prevent condensation in the stack.
     
  9. Feb 22, 2007 #8

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Don't SO2 scrubbers typically use sodium hydroxide? Hadn't heard of a barium hydroxide column.
     
  10. Feb 23, 2007 #9
    ok thanx i will see if this works , is there is a chance that u know any thing about combination between sulfur and sulfuric acid production plant ?
     
  11. Feb 23, 2007 #10

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You could use NaOH for dry gasses. I recommended barium hydroxide because of its limited solubility in water. A more soluble base, like lime, would cake up and stop passing gas. Sodium hydroxide would be even more susceptible.
     
  12. Feb 26, 2007 #11

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member


    Actually this isn't true. Barium hydroxide is quite soluble in water.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: So2 removal from water
  1. Removing water (Replies: 1)

Loading...