초록 ▼

A process and apparatus for mixing fluid catalytic cracking hydrocarbon feed and catalyst is disclosed. The invention passes lift gas through a first conduit which is axially aligned with a second conduit. A downstream end of the first conduit and an upstream end of the second conduit are located wi

A process and apparatus for mixing fluid catalytic cracking hydrocarbon feed and catalyst is disclosed. The invention passes lift gas through a first conduit which is axially aligned with a second conduit. A downstream end of the first conduit and an upstream end of the second conduit are located within a catalyst bed enclosed by a chamber. Furthermore, the second conduit axially injects catalyst and lift gas into an upstream end of an elongated fluid catalytic cracking riser while passing hydrocarbon feed into the riser through an annular zone about the upstream end of the riser. Preferably steam also passes through this annular zone. The process and apparatus achieves substantially uniform catalyst-to-oil ratio across a horizontal cross-section of the riser. A process and apparatus for control of the level of the catalyst bed in the enclosed chamber by employing a control gas stream is also disclosed.

대표청구항 ▼

An apparatus for mixing fluid catalytic cracking catalyst and hydrocarbon feedstock comprising: an enclosed chamber having an outlet end; an elongated tubular riser having an upstream end and a downstream end said upstream end being arranged in fluid communication with the outlet end of said chamber

An apparatus for mixing fluid catalytic cracking catalyst and hydrocarbon feedstock comprising: an enclosed chamber having an outlet end; an elongated tubular riser having an upstream end and a downstream end said upstream end being arranged in fluid communication with the outlet end of said chamber; a catalyst inlet conduit attached to and in fluid communication with the interior of said enclosed chamber; a first vertical conduit for introducing lift gas into the interior of said enclosed chamber, said first conduit having an upstream end and a downstream end; a second vertical conduit having an upstream end and a downstream end, said second conduit upstream end being within said enclosed chamber, said second conduit downstream end being in fluid communication with said riser, said second conduit being axially aligned with said riser and said first conduit; and means for passing said hydrocarbon feedstock in atomized form in annular flow from said outlet end of said enclosed chamber into said riser upstream end.