Upgrading naphtha in a multiple riser fluid catalytic cracking operation employing a catalyst mixture
US4830728A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Feb 19, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2208/0053
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalytic cracking process is provided featuring multiple risers in which a variety of hydrocarbon conversion reactions take place, a stripping unit in which entrained hydrocarbon material is removed from catalyst and a regeneration zone in which spent cracking catalyst is regenerated, which comprises: PA1 (a) converting a relatively high boiling hydrocarbon charge material in a first riser in the presence of a first catalyst component which is an amorphous cracking catalyst and/or a large pore crystalline zeolite cracking catalyst to provide lighter products; PA1 (b) converting an ethylene-rich charge material introduced to a second riser at a lower level thereof in the presence of a second catalyst component which is a shape selective medium pore crystalline silicate zeolite catalyst to provide heavier products and to increase the temperature of the catalyst in said region; and, PA1 (c) converting a naphtha charge material introduced to the second riser at a higher level thereof in the presence of said second catalyst component to provide a relatively high octane gasoline product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.