Process to upgrade partially converted vacuum residua
Processes for upgrading partially converted vacuum residua hydrocarbon feeds are disclosed. The upgrading processes may include: steam stripping the partially converted vacuum residua to generate a first distillate and a first residuum; solvent deasphalting the first residuum stream to generate a deasphalted oil and an asphaltenes fraction; vacuum fractionating the deasphalted oil to recover a deasphalted gas oil distillate and a heavy deasphalted residuum; contacting the first distillate and the deasphalted gas oil distillate and hydrogen in the presence of a first hydroconversion catalyst to produce a product; contacting the heavy deasphalted residuum stream and hydrogen in the presence of a second hydroconversion catalyst to produce an effluent; and fractionating the effluent to recover a hydrocracked atmospheric residua and a hydrocracked atmospheric distillate.
1. A system for upgrading partially converted residuum hydrocarbons, the system comprising:
a mass transfer device to strip a partially converted residuum hydrocarbon stream into a first distillate stream and a first residuum stream;
a solvent deasphalting unit for recovering a deasphalted oil stream and an asphaltenes stream from the first residuum stream;
a vacuum fractionation unit to fractionate the deasphalted oil stream to recover a deasphalted gas oil stream and a heavy deasphalted residuum stream;
an ebullated bed hydroconversion reactor system for contacting the heavy deasphalted residuum stream and hydrogen with a first hydroconversion catalyst to produce a first effluent;
an atmospheric fractionation unit to fractionate the first effluent to recover a hydrocarbon atmospheric distillate stream and a hydrocarbon atmospheric residuum stream;
a fixed bed hydroconversion reactor system for contacting at least one of the first distillate stream, the deasphalted gas oil stream, and the hydrocarbon atmospheric distillate stream to produce a second effluent.
2. The system of claim 1 , further comprising a gasification system for converting the asphaltenes stream to a synthesis gas.
3. The system of claim 1 , further comprising an upstream conversion unit to convert a residuum stream to the partially converted residuum hydrocarbon stream.
4. The system of claim 3 , wherein the upstream conversion unit is selected from the group consisting of a hydrocracking unit, a vac resid coking unit, a hydrothermolysis unit, a hydropyrolysis unit, a pyrolysis unit, an oil shale retorting unit, a biomass pyrolysis unit, a biomass hydropyrolysis unit, a biomass hydrothermolysis unit, a tar sands extraction unit, a steam assisted gravity drainage process, a toe to heel air injection process, an in situ petroleum extraction processes, or a combination thereof.
5. The system of claim 1 , wherein the mass transfer device comprises a stripping tower.
6. The system of claim 4 , wherein the hydrocracking unit comprises an ebullated bed, a fixed-bed or a moving-bed hydrocracking unit.
7. The system of claim 1 , further comprising a high temperature/high pressure separator upstream of the steam stripper to produce the partially converted residuum hydrocarbon stream.
8. The system of claim 7 , wherein a vapor fraction from the high temperature/high pressure separator is fed to the fixed bed hydroconversion reactor system.
9. The system of claim 1 , further comprising a high temperature/high pressure separator upstream of the atmospheric fractionation unit to recover a vapor fraction and a liquid fraction from the first effluent of the ebullated bed hydroconversion reactor system.
10. The system of claim 9 , wherein the vapor fraction from the high temperature/high pressure separator is fed to the fixed bed hydroconversion reactor system.
11. The system of claim 9 , wherein the liquid fraction from the high temperature/high pressure separator is fed to the atmospheric fractionation unit.