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
include:
Pretreat the FCC feed to remove
sulfur
Increase sulfur conversion to hydrogen sulfide
inside the FCC
Post treat FCC product to remove
sulfur.2-10
Where is the
sulfur? Since the 1940s, refiners have
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