| 摘要 |
A dual riser FCC process for converting C<SUB>3</SUB>/C<SUB>4</SUB>-containing feedstocks to aromatics. First and second hydrocarbon feeds ( 5, 6 ) are supplied to the respective first and second risers ( 2, 4 ) in a dual-riser FCC unit with a gallium enriched catalyst to make an effluent rich in ethylene, propylene and aromatics. The first riser ( 2 ) is operated at less severe conditions than the second riser ( 4 ) and can receive a relatively heavy feed such as gas oil. The feed to the second riser ( 4 ) includes propane, for example LPG, propane recycle from the C3 splitter ( 72 ), etc. The FCC catalyst can include gallium to promote aromatics formation.
|
