Processing vacuum residuum and vacuum gas oil in ebullated bed reactor systems
AssigneeLummus Technology Inc.
InventorsArun Arora, Marvin I. Greene
Life of this patent
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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.
Claims10
A system for upgrading residuum hydrocarbons and heavy distillate feedstocks, the system comprising:
- an ebullated bed hydroconversion reactor system configured to contact residuum hydrocarbons and hydrogen with a non-zeolitic base metal hydroconversion catalyst to produce a first effluent,
- a first separation unit configured to separate the first effluent to recover a first liquid product and a first vapor product;
- an absorption tower configured to concurrently contact counter-currently the first vapor product with a hydrocarbon stream, and 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 hydrocarbon;
- a first flowline configured to feed the first vapor product to the absorption tower;
- an ebullated bed hydrocracking reactor system configured to contact the second vapor product and a heavy distillate feedstock with a zeolitic selective hydrocracking catalyst to produce a second effluent;
- a second flowline configured to feed the second vapor product to the ebullated bed hydrocracking reactor system;
- and
- a third separation unit configured to separate the second effluent and recover one or more hydrocarbon fractions.
Dependencies are inferred from the claim text.