Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Reexamination Certificate
2006-08-11
2009-02-17
Caldarola, Glenn (Department: 1797)
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
C208S071000, C208S073000, C208S079000, C208S080000, C208S155000, C208S159000, C208S164000, C208S288000, C208S288000, C585S648000, C585S649000, C585S650000, C585S651000, C585S653000
Reexamination Certificate
active
07491315
ABSTRACT:
A dual riser FCC process is disclosed wherein first and second hydrocarbon feeds (5, 6) are supplied to the respective first and second risers (2, 4) to make an effluent rich in ethylene, propylene and/or aromatics. Where the hydrocarbon feeds are different, the respective risers can have different conditions to favor conversion to ethylene and/or propylene. A minor amount of a coke precursor (80, 82) can be added to one or both of the hydrocarbon feeds (5, 6) to reduce or eliminate the amount of supplemental fuel needed to heat balance the system. The different feeds, including the coke precursor and any recycle streams (36, 44) can be segregated by type to improve olefin yields, including an embodiment where the paraffinic feeds are supplied to one riser and the olefinic feeds to the other.
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Eng Curtis N.
Miller Rik B.
Caldarola Glenn
KBR IP Legal
Kellogg Brown & Root LLC
Singh Prem C.
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