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 ▼

A process for mixing fluid catalytic cracking catalyst and hydrocarbon feedstock comprising the steps of: passing a first stream of said catalyst into a catalyst bed in an enclosed chamber; passing lift gas through a first vertical conduit into said enclosed chamber; axially passing said lift gas fr

A process for mixing fluid catalytic cracking catalyst and hydrocarbon feedstock comprising the steps of: passing a first stream of said catalyst into a catalyst bed in an enclosed chamber; passing lift gas through a first vertical conduit into said enclosed chamber; axially passing said lift gas from said first conduit into an upstream end of a second vertical conduit, said upstream end of said second conduit being immersed in said bed; passing said catalyst from said bed along with said lift gas into said second conduit; accelerating said catalyst through said second conduit; axially passing said catalyst and lift gas from said chamber, to an upstream end of a fluid catalytic cracking riser, through said second conduit, said riser comprising an elongated tubular vessel; atomizing said hydrocarbon feedstock and passing said atomized hydrocarbon feedstock in annular flow about an inner periphery of said riser upstream end; combining said hydrocarbon feedstock, catalyst and lift gas in said riser to form a mixture; and upwardly passing said mixture through said riser at fluid catalytic cracking conditions.