With new catalyst systems, hydroprocessing efforts more efficiently
reduce complex sulfur compounds and lower blended fuels’ sulfur content
Removing sulfur in its various complex forms is an uphill battle.
Current regulatory trends for refined products are headed directly
toward "sulfur-free" fuels. Beginning in 2004, U.S. gasoline sulfur
regulations will phase in sulfur reductions and require an average
gasoline sulfur level of 30 ppm with a cap of 80 ppm. To meet these
stringent demands will require FCC feed sulfur contents reminiscent
of what used to be considered diesel sulfur specs. The Canadian
fuels sulfur situation also parallels the U.S. trend.
Highway diesel, indeed, will truly be ultra-low sulfur diesel
(ULSD.) New regulations mandate the sulfur content to be less than
that of gasoline-capped at 15 ppm
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