Pressure cascaded two-stage hydrocracking unit
US8343334B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 2009 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Apr 12, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2400/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method and apparatus for hydrocracking an oil feedstock to produce a light oil stream without build-up of heavy polynuclear aromatic (HPNA) hydrocarbons in the recycle stream is provided. The method includes the steps of (1) hydrocracking the oil feedstock with a hydrotreating catalyst in a first reactor to produce an effluent stream; (2) fractionating the effluent stream into first, second and third product streams, wherein the first product stream includes C1-C4, naphtha and diesel boiling in the range of 36-370° C., the second product stream includes hydrocarbon components with an initial nominal boiling point of 370° C. and a final boiling point ranging from 420-480° C., and the third product stream that includes HPNA hydrocarbons and other hydrocarbons boiling above about 420° C. to about 480° C., depending upon the final boiling point of the second product stream; (3) cracking the second product stream in a second reactor; and (4) cracking the third product stream in a third reactor at a higher operational pressure than the second reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.