So2 removal from water

  • Thread starter zooz
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  • #1
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hiii i want a method to saparate water from so2 ?
 

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  • #2
chemisttree
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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.
 
  • #3
Gokul43201
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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.
 
  • #4
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yeah i meant removing so2 gas from water vapour
 
  • #5
chemisttree
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Are you trying to dry an SO2 stream (remove water from SO2) or strip SO2 from water vapor (removing SO2 gas from water vapor)?
 
  • #6
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removing SO2 gas from water vapour
 
  • #7
chemisttree
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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.
 
  • #8
Gokul43201
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Don't SO2 scrubbers typically use sodium hydroxide? Hadn't heard of a barium hydroxide column.
 
  • #9
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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 ?
 
  • #10
chemisttree
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Don't SO2 scrubbers typically use sodium hydroxide? Hadn't heard of a barium hydroxide column.
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.
 
  • #11
chemisttree
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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.

Actually this isn't true. Barium hydroxide is quite soluble in water.
 

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