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Contact process for H2SO4

  1. Dec 23, 2014 #1
    I have a doubt please look at this video
    At time 1:54 to 2:00 and from time 3:24 to 3:29 After looking at video at time i have mentioned ,one will find that H2SO4 is itself used in this process so my question is whats the point in making H2SO4 by this method,as the method itself requires H2SO4.What's the net advantage when we are using H2SO4 (along with many other chemical compounds such as SO2,V2O5)and then producing the same?
     
  2. jcsd
  3. Dec 23, 2014 #2

    DrDu

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    If I remember correctly, H2SO4 is used as a solvent. There is a net production of H2SO4 in that process as the acid serving as solvent can be recycled.
     
  4. Dec 23, 2014 #3
    OK one more question how impurities in SO2 and o2 reduces the efficiency of V2O5 (used as catalyst) in this process?
     
  5. Dec 23, 2014 #4

    DrDu

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    They get adsorbed on the catalys thus hindering the reactants to react at the surface.
     
  6. Dec 23, 2014 #5
    they means impurities ,right?
    at the surface of catalyst V2O5 ,right?
     
  7. Dec 23, 2014 #6

    DrDu

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    Yes, yes
     
  8. Dec 23, 2014 #7
    OK this explains only about when H2SO4 is used as a solvent but what about when H2SO4 is used as spray?look at this in the video At time 1:54 to 2:00 .how can this be recycled?
     
  9. Dec 23, 2014 #8

    DrDu

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    There are tons of information readily available on the net. Which ones did you check besides this video?
     
  10. Dec 23, 2014 #9
  11. Dec 23, 2014 #10
    So i have searched a lot but such type of in depth questions (as my post 7)can only be answered here.That's why i request you to answer my post 7.
    Regards.
     
  12. Dec 23, 2014 #11

    DrDu

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    The sulfuric acid is used to dissolve the SO3 formed which yields oleum. The latter is diluted to form H2SO4 again. So where is the problem?
     
  13. Dec 23, 2014 #12
    That's what the problem is,We are using H2SO4 to produce H2SO4 what's the net advantage?
     
  14. Dec 23, 2014 #13

    DrDu

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    That you get more H2SO4 than you put in.
     
  15. Dec 23, 2014 #14
    According to your post 2 that H2SO4 is recycled again,right?
     
  16. Dec 23, 2014 #15

    DrDu

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    Yes, but obviously not all of it.
     
  17. Dec 23, 2014 #16
    And H2SO4 when used as spray consume very less amount of H2SO4 as compared to high yield of end product H2SO4,right?
     
  18. Dec 23, 2014 #17

    Borek

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    Staff: Mentor

    Acid used in the process is not consumed, it is still present in the final product.
     
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