Cat naphtha sulfur management: undercut or not?
Several processing options can create a high-sulfur heavy cat naphtha that concentrates FCC sulfur into one stream
New U.S. regulations will place intense investment
and economic pressures on refinery processing to meet tighter
sulfur specifications for gasoline.1 Fluid
catalytic cracking (FCC) unit naphtha (cat naphtha) is the
major contributor to gasoline sulfur. Approximately 90%, or
even more, of current gasoline sulfur originates from cat
naphtha. Efforts to reduce cat-naphtha-sulfur content
- Pretreat the FCC feed to remove
- Increase sulfur conversion to hydrogen sulfide
inside the FCC
- Post treat FCC product to remove
Where is the
sulfur? Since the 1940s, refiners have known that
the bulk of the sulfur concentrates in the heavy end of the
cat naphtha.11 - 14 Undercutting FCC naphtha is an
obvious way to reduce sulfur content. Undercutting includes
both dropping naphtha down to light cycle oil (LCO) and
taking a separate heavy-naphtha product.
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