Cracking with spent catalyst
US5372704A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1992 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Mar 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G51/026
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process and apparatus for low cracking or recracking of liquid hydrocarbons with FCC catalyst containing 0.2 to 1.5 wt % coke is disclosed. FCC naphtha, or a thermally or hydrocracked naphtha, contacts spent FCC catalyst in a naphtha recracking reactor for limited conversion to lighter products and an increase in octane number. Spent catalyst from the recracking reactor can be recycled to the FCC reactor without stripping or regeneration. Naphtha recracking products are preferably cooled, then used as an absorbent to recover gasoline boiling range products from the FCC main column overhead vapor. Use of spent catalyst and controlled conversion conditions minimizes overcracking of the light liquid and minimizes formation of heavy ends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.