C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/162
C10G 11/18 (2006.01) C10G 11/00 (2006.01)
Patent
CA 1233425
Abstract An improved liquid hydrocarbon feed method is disclosed wherein substantially all of the liquid is converted to mist sized particles over a wide angled dispersion pattern without a concurrent shroud of steam or water. Such dispersion promotes vapor phase catalytic reaction between hydrocarbon vapors and fluidized catalyst in a reaction time of 1 to 3 seconds. In a preferred form, the liquid feed is introduced into the transition section of a riser reactor. The misting nozzle is characterized by a swirl chamber to which the full hydrocarbon feed is supplied for centrifugal rotation by vane members and the flow is released through a reduced area orifice having a short throat to maintain a low pressure drop through the nozzle and a cylindrically confined stream flow into the riser reactor produces a wide angled conical dispersion pattern. Introduction of such a hydrocarbon dispersion into the reactor riser at high flow rate is maintained so that the liquid is substan- tially instantaneous vaporized. Coking of the feed nozzle is thus avoided without requiring assistance of steam or water flow therearound. Generation of misted hydrocarbon particles without steam or water substan- tially improves the economics of processing the resul- ting fluidized catalyting cracking products distilled from the evolved vapors by reducing sour (acid) water disposal. Coking in the feed nozzle is avoided by maintaining high liquid velocities in the nozzle. The large open area of the ports and exit orifice minimize the opportunity for physical plugging of the nozzle by coke or other foreign materials. Short straight cylindrical flow from the orifice allows the nozzle to be recessed out of the flowing catalyst stream. This keeps the nozzle cooler and minimizes mechanical ero- sion of the nozzle by the heated catalyst.
443269
Chessmore Donald O.
Pettersen Frederick A.
Chevron Research And Technology Company
Smart & Biggar
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