Why so much o2 left after So2 to so3 conversion

[Roy art]

I've 12% of so2 & 12% of o2 (volume %)
This is what entering the v2o5 catalyst converter. After the last bed 4th bed we have only 560 ppm of so 2 , I.e 0.056% of so2 , but 10 % of o2 still remaining. If the equation says half mole of 02 required for 1 mole so2 . At least 6% of o2 must have consumed for 12% of so2.

 

[Bystander]

First, what's the composition of the rest of the feed? Second, what are you taking off as product? Third, what methods are you using for the O₂ and SO₂ assays?

 

[Roy art]

First, what's the composition of the rest of the feed? Second, what are you taking off as product? Third, what methods are you using for the O₂ and SO₂ assays?

Sir, a volume of gas 150knm3 contains 12% so2 , 12% of o2 & remaining nitrogen. This enters the catalytic converter has 4 beds. Catalyst is v2o5. The so2 % & o2 % entering the first bed is mentioned above. The conversation of so3 happens in each bed. Typical adiabatic conversion. We have done analysis of so2 & o2 in each bed outlet. Found so2 % is gradually decreasing as the conversion happens. At the outlet of 4th bed the so2 % is .056% & o2 % is 10 %.

 

[Roy art]

Sir, a volume of gas 150knm3 contains 12% so2 , 12% of o2 & remaining nitrogen. This enters the catalytic converter has 4 beds. Catalyst is v2o5. The so2 % & o2 % entering the first bed is mentioned above. The conversation of so3 happens in each bed. Typical adiabatic conversion. We have done analysis of so2 & o2 in each bed outlet. Found so2 % is gradually decreasing as the conversion happens. At the outlet of 4th bed the so2 % is .056% & o2 % is 10 %.

First, what's the composition of the rest of the feed? Second, what are you taking off as product? Third, what methods are you using for the O₂ and SO₂ assays?

First, what's the composition of the rest of the feed? Second, what are you taking off as product? Third, what methods are you using for the O₂ and SO₂ assays?

If 12 % of so2 completely converts into so3 it requires atleast 6%of o2. Almost 11.5% of so2 is converted into so3. But y still 4th bed outlet has 10% OF O2 is remaining.

 

[Bystander]

No water getting into the feed stream?

 

[Roy art]

No water getting into the feed stream?

No not at all

 

[Roy art]

No water getting into the feed stream?

Nowhere no oxygen & water is entering the stream

 

[Bystander]

Process temperature? How much V₂O₅ in the catalyst beds?

 

[Quantum Defect]

I've 12% of so2 & 12% of o2 (volume %)
This is what entering the v2o5 catalyst converter. After the last bed 4th bed we have only 560 ppm of so 2 , I.e 0.056% of so2 , but 10 % of o2 still remaining. If the equation says half mole of 02 required for 1 mole so2 . At least 6% of o2 must have consumed for 12% of so2.

Seems like something else is happening to the SO2, other than reaction with oxygen.

What else could you have in the system?

 

[Wellesley]

Either you have moisture in your gas/reactor and the SO3 is turning into H2SO4, or you have a leak and your gas is leaving. Either way, willing to bet your total flow IN is not equal to the total theoretical flow OUT. You're measuring everything in %s, which may not be comparable to initial and final conditions. Have to do stoichiometric material balances though, since mass/moles in does not equal out when it comes to reactions.