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[popay73]

Hi, I have a following question: In Convertor, SO2 is converted to SO3. It should be 98 % conversion and it's done in 4 beds with V2O5 acting as a catalyst. After first bed we get ~ 75 %, after second ~ 92 % and so on. As the process starts, conversion is measured by reading SO2 concentration. After the 98 % conversion is achieved this instrument stops working and Temperatures in converter are used for controling conversion. Temperature of 600 °C is achieved in 1 st bed.
My question is: if temperatures are good enough for controling conversion, why can't we control it by temperatures in the beginig instead of the instrument ? Say, when temperature in 1 st bed reaches ~ 600 °C isn't that sign we have 98 % conversion ?
I'm a student of Che Eng and doing my educational practice in Sulphonation unit.
Thx in advance !