Integration of residue hydrocracking and hydrotreating

A system for upgrading residuum hydrocarbons, the system comprising:

• a first ebullated bed hydroconversion reactor system for contacting a residuum hydrocarbon fraction and hydrogen with a first hydroconversion catalyst to produce a first effluent;
• a second hydroconversion reactor system for contacting the first effluent and hydrogen with a second hydroconversion catalyst to produce a second effluent;
• a second ebullated bed hydroconversion reactor system for contacting the second effluent and hydrogen with a third hydroconversion catalyst to produce a third effluent and
• a fractionation unit to fractionate the third effluent to recover one or more hydrocarbon fractions and the vacuum residuum fraction.

A process for upgrading residuum hydrocarbons, the process comprising:

• 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;
• contacting the first effluent and hydrogen with a second hydroconversion catalyst in a second hydroconversion reactor system;
• recovering a second effluent from the second hydroconversion reactor system;
• contacting the second effluent and hydrogen with a third hydroconversion catalyst in a third hydroconversion reactor system;
• recovering a third effluent from the third hydroconversion reactor system;
• combining the second effluent and the third effluent to form a combined feed;
• feeding the combined feed to a separator to produce a vapor fraction and a liquid fraction;
• fractionating the liquid fraction to recover the vacuum residuum fraction in a first fractionation system;
• contacting the vapor fraction with a fourth hydroconversion catalyst in a fourth hydroconversion reactor system;
• recovering a fourth effluent from the third hydroconversion reactor system;
• fractionating the fourth effluent to recover one or more hydrocarbon fractions in a second fractionation system.

A system for upgrading residuum hydrocarbons, the system comprising:

• a first ebullated bed hydroconversion reactor system for contacting a residuum hydrocarbon fraction and hydrogen with a first hydroconversion catalyst to produce a first effluent;
• a second hydroconversion reactor system for contacting the first effluent and hydrogen with a second hydroconversion catalyst to produce a second effluent;
• a second ebullated bed hydroconversion reactor system for contacting the second effluent and hydrogen with a third hydroconversion catalyst to produce a third effluent;
• and
• a separator for separating a combined fraction of the second effluent and the third effluent to recover a liquid fraction and a vapor fraction;
• a fractionation unit to fractionate the liquid to recover the vacuum residuum fraction;
• a fourth hydroconversion reactor system for contacting the vapor fraction with a fourth hydroconversion catalyst to produce a fourth effluent;
• and
• a fractionation unit to fractionate the fourth effluent to recover one or more hydrocarbon fractions.