Supplying FCC lift gas directly from product vapors

Patent · Tue Jan 29 04:00:00 EST 1991

OSTI ID:5212530

Sechrist, P A; Lomas, D A; Myers, D N

This paper describes a process for the fluidized catalytic cracking (FCC) of hydrocarbons in a riser conversion zone. It comprises: contacting regenerated catalyst in an upstream portion of the riser conversion zone with a lift gas; discharging an effluent mixture; collecting the effluent mixture in a separator, separating spent catalyst from the effluent mixture and withdrawing the rest of the effluent mixture from the reactor vessel; passing the spent catalyst downwardly from the reactor vessel into a stripper vessel; passing steam and hydrocarbons desorbed from the surface of the catalyst upwardly into the reactor vessel and withdrawing a gaseous mixture, having a temperature of at least 850{degrees}F; cooling the gaseous mixture by indirect heat exchange with a feed water stream to generate steam and produce a cooled mixture having a temperature of less than 650{degrees}F; contacting the cooled mixture with a water stream to produce a quenched mixture having a temperature of less than 300{degrees}F and scrub solid particles from the quenched mixture; separating condensed liquid from the quenched mixture to remove liquid and solids and produce a separator gas stream; compressing the separator gas stream to a pressure of between 15 to 50 psig; and combining the separator gas with steam to produce the lift gas.

• Assignee: UOP, Des Plaines, IL (USA)
• Patent Number(s): A; US 4988430
• Application Number: PPN: US 7-457763
• OSTI ID: 5212530
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
CHEMICAL REACTORS
CRACKING
DECOMPOSITION
FLUID FLOW
GAS FLOW
HYDROCARBONS
ORGANIC COMPOUNDS
PYROLYSIS
THERMOCHEMICAL PROCESSES