The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 2009
Filed:
Aug. 11, 2006
Curtis N. Eng, Houston, TX (US);
Rik B. Miller, Stillwater, OK (US);
Curtis N. Eng, Houston, TX (US);
Rik B. Miller, Stillwater, OK (US);
Kellogg Brown & Root LLC, Houston, TX (US);
Abstract
A dual riser FCC process is disclosed wherein first and second hydrocarbon feeds () are supplied to the respective first and second risers () 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 () can be added to one or both of the hydrocarbon feeds () 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 () 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.