FLUID CAT CRACKING WITH HIGH OLEFINS PROUDUCTION
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United States of America Patent
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Issued Date -
Jan 10, 2002
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1998
priority date (Note) -
Abandoned
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Abstract
The propylene production of a fluid catalytic cracking unit employing a large pore zeolite cracking catalyst, produces more propylene by adding a naphtha cracking riser and a medium pore zeolite catalytic component to the unit, and recycling at least a portion of the naphtha crackate to the naphtha riser. The large pore size zeolite preferably comprises a USY zeolite and the medium pore size is preferably ZSM-5. Propylene production per unit of naphtha feed to the naphtha riser is maximized, by using the 60-300.degree. F. naphtha crackate as the feed.
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