System for upgrading residuum hydrocarbons

Abstract

A process for upgrading residuum hydrocarbons is disclosed. The process may include: contacting a residuum hydrocarbon fraction and hydrogen with a first hydroconversion catalyst in a first ebullated bed hydroconversion reactor system; recovering a first effluent from the first ebullated bed hydroconversion reactor system; solvent deasphalting a vacuum residuum fraction to produce a deasphalted oil fraction and an asphalt fraction; contacting the deasphalted oil fraction and hydrogen with a second hydroconversion catalyst in a second hydroconversion reactor system; recovering a second effluent from the second hydroconversion reactor system; and fractionating the first effluent from the first ebullated bed hydroconversion reactor system and the second effluent from the second hydroconversion reactor system to recover one or more hydrocarbon fractions and the vacuum residuum fraction in a common fractionation system.

What is claimed: 
     
         1 . A system for upgrading residuum hydrocarbons, the system comprising:
 a first ebullated bed hydroconversion reactor system for contacting a residuum hydrocarbon fraction and hydrogen to produce a first effluent;   a second ebullated bed hydroconversion reactor system for contacting a deasphalted oil fraction and hydrogen to produce a second effluent; and   a first fractionation unit to fractionate the first effluent and the second effluent to recover one or more hydrocarbon fractions comprising a vacuum residuum fraction;   a solvent deasphalting unit to solvent deasphalt the vacuum residuum fraction to produce the deasphalted oil fraction and an asphalt fraction;   a third ebullated bed hydroconversion reactor system for contacting the asphalt fraction and hydrogen to produce a third effluent; and   a second fractionation unit to fractionate the third effluent to recover one or more hydrocarbon fractions.   
     
     
         2 . The system of  claim 1 , wherein the fractionation unit is fluidly coupled to at least one of the solvent deasphalting unit, a vacuum distillation system, the first ebullated bed hydroconversion reactor system, the second ebullated bed hydroconversion reactor system, and the third ebullated bed hydroconversion reactor system. 
     
     
         3 . The system of  claim 1 , wherein the first ebullated bed hydroconversion reactor system, the second ebullated bed hydroconversion reactor system, and the third ebullated bed hydroconversion reactor system operate at different severities. 
     
     
         4 . The system of  claim 1 , wherein the first fractionation unit further comprises a high pressure-high temperature separator. 
     
     
         5 . The system of  claim 1 , wherein the first fractionation unit further produces a heavy gas oil fraction which is sent to the solvent deasphalting unit. 
     
     
         6 . The system of  claim 1 , wherein the first fractionation unit and the second fractionation unit are a single unit. 
     
     
         7 . A system for upgrading residuum hydrocarbons, the system comprising:
 a first ebullated bed hydroconversion reactor system for contacting a residuum hydrocarbon fraction and hydrogen to produce a first effluent;   a solvent deasphalting unit to solvent deasphalt a vacuum residuum fraction to produce a deasphalted oil fraction and an asphalt fraction;   a second ebullated bed hydroconversion reactor system for contacting the deasphalted oil fraction and hydrogen to produce a second effluent; and   a separator to separate a combined fraction of the first effluent and the second effluent to recover a liquid fraction and a vapor fraction;   a first fractionation unit to fractionate the liquid fraction to recover the vacuum residuum fraction;   a fixed bed hydroconversion reactor system for contacting the vapor fraction to produce a third effluent;   a second fractionation unit to fractionate the third effluent to recover one or more hydrocarbon fractions;   a third ebullated bed hydroconversion reactor system for contacting the asphalt fraction and hydrogen to produce a third effluent; and   a third fractionation unit to fractionate the third effluent to recover one or more hydrocarbon fractions.   
     
     
         8 . The system of  claim 10 , wherein the first fractionation unit is a vacuum distillation unit. 
     
     
         9 . A system for upgrading residuum hydrocarbons, the system comprising:
 a first ebullated bed hydroconversion reactor system for contacting a residuum hydrocarbon fraction and hydrogen to produce a first effluent;   a solvent deasphalting unit to solvent deasphalt a vacuum residuum fraction to produce a deasphalted oil fraction and an asphalt fraction;   a second ebullated bed hydroconversion reactor system for contacting the deasphalted oil fraction and hydrogen to produce a second effluent; and   a first fractionation unit to fractionate the first effluent and the second effluent to recover one or more hydrocarbon fractions and the vacuum residuum fraction;   a third ebullated bed hydroconversion reactor system for contacting the asphalt fraction and hydrogen to produce a third effluent;   a separator to separate the third effluent and recover a liquid fraction and a vapor fraction;   a second fractionation unit to fractionate the liquid traction to recover the vacuum residuum fraction;   a fixed bed hydroconversion reactor system for contacting the vapor fraction to produce a fourth effluent; and   a third fractionation unit to fractionate the fourth effluent recover one or more hydrocarbon fractions.   
     
     
         10 . The system of claim  12 , wherein the second fractionation unit is an atmospheric distillation unit. 
     
     
         11 . The system of claim  12 , wherein the third fractionation unit is a vacuum distillation unit.