Multi-stage catalytic process for high conversion of heavy...

Details Multi-stage catalytic process for high conversion of heavy... Multi-stage catalytic process for high conversion of heavy...

C - Chemistry, Metallurgy

10

G

196/130

C10G 45/00 (2006.01) C10G 65/02 (2006.01)

Patent

CA 1238005

ABSTRACT OF DISCLOSURE A process for high hydroconversion of heavy liquid hydrocarbons, such as petroleum resid feedstocks containing at least about 25 V % material boiling above about 975°F+, using multi-stage catalytic reactions at elevated temperature and pressure to produce increased yields of lower boiling hydrocarbon liquids and gas. In the process, the feedstock is fed in liquid phase with hydrogen at elevated temperature and pressure conditions into a staged catalytic reactor system, preferably containing ebullated catalyst beds. from which a vacuum bottoms fraction having a nominal boiling point above about 800°F is recycled to the last-stage reactor rather than to the first-stage, to improve conversion of the 975°F+ fraction to lower boiling liquid products. If desired, three stages of catalytic reaction can be used with the vacuum bottoms material fraction being recycled to the third stage reactor.

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