Processing vacuum residuum and vacuum gas oil in ebullated bed reactor systems
AssigneeLummus Technology Inc.
InventorsArun Arora, Marvin I. Greene
Life of this patent
Estimating the term…
Abstract
A process for upgrading vacuum residuum and vacuum gas oil hydrocarbons is disclosed. The process may include: contacting a heavy distillate hydrocarbon fraction and hydrogen with a zeolite selective hydrocracking catalyst in a first ebullated bed hydrocracking reaction zone to convert at least a portion of the vacuum gas oil to lighter hydrocarbons. Contacting a residuum hydrocarbon fraction and hydrogen with a non-zeolite base metal hydroconversion catalyst in a second ebullated bed hydroconversion reaction zone may produce a vapor stream containing unconverted hydrogen, acid gases and volatilized hydrocarbons which may be fed along with the vacuum gas oil in the first ebullated bed hydrocracking zone.
Claims15
A process for upgrading residuum hydrocarbons and heavy distillate feedstocks, the process comprising:
- contacting residuum hydrocarbons and hydrogen with a non-zeolitic base metal hydroconversion catalyst in an ebullated bed hydroconversion reactor system to produce a first effluent;
- recovering the first effluent from the ebullated bed hydroconversion reactor system;
- fractionating the first effluent to recover a first liquid product and a first vapor product;
- contacting counter-currently the first vapor product with a hydrocarbon stream in an absorption tower to produce a second vapor product and a second liquid product, wherein the second vapor product is lean in middle distillate content and comprises gasoil range hydrocarbons;
- separating the second vapor product from the second liquid product;
- contacting the second vapor product and a heavy distillate feedstock with a zeolitic selective hydrocracking catalyst in an ebullated bed hydrocracking reactor system to produce a second effluent;
- recovering the second effluent from the ebullated bed hydrocracking reactor system;
- and
- fractionating the second effluent to recover one or more hydrocarbon fractions.
A process for upgrading heavy distillate feedstocks, the process comprising:
- contacting a first vapor fraction with a hydrocarbon stream in an absorption tower in counter current fashion to form a second vapor fraction and a second liquid fraction;
- contacting the second vapor fraction, heavy distillate feedstocks, and hydrogen with a zeolitic selective hydrocracking catalyst in an ebullated bed hydrocracking reactor system to produce an effluent;
- recovering the effluent from the ebullated bed hydrocracking reactor system;
- and
- fractionating the effluent from the ebullated bed hydrocracking reactor system to recover one or more hydrocarbon fractions.
Dependencies are inferred from the claim text.