Total Sulphur in C3 and C4 products

[Jack Nicholson]

Hi everyone. I have a question.
In our fractionation plant, LPG stream is desulphrized in reactors and then headed to depropanizer and debutanizer towers where C3 and C4 will be recovered.
When we put fresh reactor in service, total Sulphur in C4 increase drastically while total Sulphur in C3 was remained constant!
IS there any explanation based on attached picture and the fact that in both C3 and C4 products, CH4S and C2H6S is present?
Thanks in advance.

P.S.: Unfortunately our lab department are not able to analyze each Sulphur components.

 

[Jack Nicholson]

Not any answer?

 

[YTMezoan]

Hi Jack,

I have a question about your numbers. Your graph shows that the total S level in your propane product stream is constant at 0 ppm over days 1-6, but your table states that your total content of CH4S + C2H6S in your C3/propane product stream is 7.4 ppm (so, without doing the math, your total content of S from these two components in your C3/propane product stream would be ~4 ppm). Am I misunderstanding your presentation?

 

[Jack Nicholson]

Total s (CH4S AND C2H6S) is 0 based on lab results (real state) and 7.4 ppm based on design data in C3 product