George M Melfi

6558531, May 6, 2003

Mar 13, 2001

09/804721

Todd R. Steffens - Centreville VA
Paul K. Ladwig - Centreville VA
George Melfi - Whippany NJ
John E. Asplin - Houston TX

ExxonMobil Chemical Patents Inc. - Houston TX

C10G 1100

208113, 208159, 502 45, 502 46, 502 49

The invention relates to a process for maintaining heat balance in a fluidized bed catalytic cracking unit. More specifically, the invention relates to a combustion control method capable of maintaining or restoring heat balance by conducting, under appropriate conditions, fuel and an oxygen-containing gas to a transfer line. The transfer line conducts effluent including spent catalyst and combustion products to the units catalyst regeneration zone.

52756416, Jan 4, 1994

Aug 26, 1992

7/935320

Robert F. Tammera - West Orange NJ
Donald F. Shaw - Denville NJ
Kenneth J. Reinman - Long Valley NJ
George Melfi - Whippany NJ

Exxon Research & Engineering Co. - Florham Park NJ

B01D 4512

95271

Accordingly, the present invention, in one embodiment, encompasses an apparatus for the fluidized catalytic cracking of a hydrocarbon feed comprising: a riser which is generally vertically positioned within a catalyst disengaging zone and which has a plurality of openings around the circumference of the riser at its discharge end. The openings in the riser have a vertical stub portion that extends tangentially outwardly from the riser and communicates with a first end of an upwardly sloping curvilinear tunnel that terminates at a second end. The second end of the tunnel opens into a tangential opening in the primary cyclone. The area of the opening of the first end of the tunnel is larger than the area of the opening of the second end of the tunnel.

51906503, Mar 2, 1993

Jun 24, 1991

7/720056

Robert F. Tammera - West Orange NJ
Donald F. Shaw - Denville NJ
Kenneth J. Reinman - Long Valley NJ
George Melfi - Whippany NJ

Exxon Research and Engineering Company - Florham Park NJ

B01J 818
B01D 2126

210256

Accordingly, the present invention, in one embodiment, encompasses an apparatus for the fluidized catalytic cracking of a hydrocarbon feed comprising: a riser which is generally vertically positioned within a catalyst disengaging zone and which has a plurality of openings around the circumference of the riser at its discharge end. The openings in the riser have a vertical stub portion that extends tangentially outwardly from the riser and communicates with a first end of an upwardly sloping curvilinear tunnel that terminates at a second end. The second end of the tunnel opens into a tangential opening in the primary cyclone. The area of the opening of the first end of the tunnel is larger than the area of the opening of the second end of the tunnel.