Exxonmobil Research and Engineering Company

Richard C Senior

David L Johnson

Jeffrey Scott Smith

Rathna P Davuluri

Christopher Gordon Smalley

James H Beech

Brian A Cunningham

Joseph S Famolaro

This invention relates to the catalytic cracking of a hydrocarbon feed. In particular, this invention relates to an apparatus and process utilizing a catalyst stripper section of a fluid catalytic cracking (FCC) reactor with chordal trays designed to provide improved stripping of hydrocarbons from spent FCC catalyst in an FCC reactor stripping zone.

FCC catalyst stripper configuration

A fluidized catalytic cracking system includes a riser for contacting catalyst and hydrocarbon feedstock. The riser has an inner surface that defines a central passage. The central passage acts as a flow path for the catalyst and the hydrocarbon feedstock. A plurality of ribs are disposed on the riser inner surface. The ribs increase the degree of mixing that occurs between the catalyst and the hydrocarbon feedstock within the central passage. In particular, each rib has a contoured inner wall. The contour of the inner wall forces a portion of the catalyst flow inward, toward the hydrocarbon-rich center of the central passage.

System for fluidized catalytic cracking of hydrocarbon molecules

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Mandeville, LA, United States of America

Richard C Senior