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So2 And Other Sulfur Sampling Analysis Difficulty

so2 sampling contamination sru

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#1 muzaffarumar3067


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Posted 18 February 2018 - 05:23 AM

We are carrying out sampling analysis of the acid gas at the inlet and outlet of the hydrogenation reactor catalyst at one of our SRU.


Since the start of the analysis we have not been able to attain proper analysis of SO2 at the inlet as well as the outlet


As per H&M balance, the inlet and outlet SO2 should be 0.2% and 0% respectively. This however is not seen in our lab analysis. 


We are suspected the following issues:


  1. Sampling contamination, as there is water vapor present in the acid gas and hence improrper sampling can lead to reaction between the SO2 and Water vapour producing and hence give wrong reading. 
  2. Strahman valve that is present for sample collection has an addtional fitting attached to it and hence that is causing sulfur/acid gas condensation and hence wrong reading.


Are the above assumptions right or is there any other thing that we should be looking at or there is other source of contamincation 


Also how easily can SO2 analysis be masked by contamination from Water vapor, impurities etc.







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Posted 10 March 2018 - 03:08 AM

which method you are using for SO2 analysis? .. West and gaeke?

#3 muzaffarumar3067


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Posted 27 March 2018 - 10:04 PM

We are doing GC based compositional analysis, i am more interested in correct way of sampling, 


We have now tried using teflon tube which shall be insterted into the process line to collect the sample, the sample then passes through the moisture adsorbent. 


Doing so we got reasonable results and SO2 also showed as readings as expected

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