I am not sure that I understand what you are proposing. Perhaps you are defining terms in a different way.   Adsorptive desulfurization is not usually  a practical refinery process process and Bitumen does not usually contain very much material in the diesel boiling range.

The most common way to upgrade bitumen is similar to any other crude fractionation followed by carbon rejection processes (delayed coking unit (DCU), Fluid Bed Catalytic Cracking (FCCU) and/or Hydrogen addition processes Ebulated bed Hydrocracking ( H-Oil and LC-Fining),  Hydrocracking and Hydrotreating.

Adsorptive desulfurization  is not practical because :

* Hydrotreating is a much better proven technology that works reliably and efficiently

* It is very difficult to remove S down to the 15 wppm ULSD specification with extractive distillation

* The loss of product would be large because S containing compounds in this boiling range are typical  and 85% HC and 15% S ,

For example if the bitumen contains 2.5% S in the diesel boiling range that would represent about 20% of the compounds in the diesel boiling range extracting these compound would result in a net yield around 80% instead of 98-100% for hydrotreaing and you would probably need to hydrotreat both the extract and raffinate anyway to meet specs.

I hope this helps a little but I think you need to clarify your question.

Best Regards

Rick

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Let think about adsorptive desulfurization process with the aid of activated carbon.Goal is to produce Ultra low sulfur diesel.After adsorption, we will get  ULSD and intermediate product by filtration.Now my question is how can I produce bitumen using these intermediate product? I am doing research ...So I need to generate ideas...

Ok lets talk about adsorptive distillation first and forget about bitumen for now. How do you expect adsorptive distillation to work?  Lets say you have a relatively clean diesel as a feed with about 1 -1.5% S in the feed.  That corresponds to about 10 wt% of the compounds having S in them.  To get to ULSD spec (15 wppm S) you most selectively extract all of them about 10% of the feed. That is improbable with activated carbon but let say you succeed.  Now what do you propose to do with all of that sulfur containing "active carbon" with sulfur compounds on it material?sulfu

Is this what you mean by intermediate product?  Activated carbon with high sulfur diesel boiling range material adsorbed on to it?  Why do you want to downgrade this material to make bitumen?

I guess you could make a case for using activated carbon to "correct" sulfur that is slightly off spec say between 16 and 20 WPPM that needs to be corrected to

It would be better for you If I could show you overall process diagram.Anyway I am trying to explain it.Above mentioned intermediate product means semi solid  with high sulfur content which is obtained after filtration.I would like to have these high sulfur activated carbon for bitumen production.Because bitumen is useful product as u know that and other hand semi solid  with sulfur content which is wastage after desulfurization. 

The word Bitumen can have several meanings.  But it typically means a very heavy oil or asphalt.  Very heavy oils are usually not very valuable Asphalt can have high value seasonally but it general needs to meet specification for viscosity and penetration.  Your high sulfur semi solid could potentially be used as an additive to road asphalt in some places but we will need to know a lot more about the quality of the material. 

I am still very confused about your proposed ULSD process.  Can you share some information about the quality of the feed and product from your ULSD process?  Are you proposing desulfurizing high sulfur diesel to 15 WPPM ULSD with activated carbon filtration alone?