First at all, please be aware that there is not a single value and following information is from my own experience developed chart. I have found that H2S wt% of total mass can be determined from 0.21 to 0.41 times Coker feed S(wt%); however it is not linear and only valid for a limited S(wt%) range of 3.3-4.1.
As an example, 3.5 wt% S in Coker feed would result in 0.28-0.30 times or about 1wt% total feed mass.
Great input Lucky, thanks. I have a feed pretty high in S content though, 5.7 wt% so while it lies outside of your developed chart: could you predict what kind of h2s release I would be looking at (if some kind of prediction could be given?)
Also, I’m looking at only partially coking/cracking the heavy oil feed. Around a 30% conversion to be precise, and about 40% of the S in the feed is sulfides (the S molecules easily removed from oils by coking) if this is of any relevance.