Process for introducing fine and coarse additives for hydroconversion of heavy hydrocarbons
View Patent ↗A process for slurry-phase hydrocracking of a heavy hydrocarbon feedstock in a reactor, such as an upflow bubble column reactor, includes separately introducing additive in two size ranges into the feedstock. A fine size particle additive is introduced upstream of a coarse size particle additive.
1. A process for slurry-phase hydrocracking of a heavy hydrocarbon feedstock in a slurry phase hydrocracking reactor, the process comprising:
introducing a first additive to the feedstock upstream of a feed charge pump and upstream of a pre-heat exchanger to form a fines-loaded feedstock, the first additive comprising fines particles having a median particle size between 100 microns and 200 microns;
separately introducing a second additive to the fines-loaded feedstock downstream of the feed charge pump and upstream of the slurry phase hydrocracking reactor, the second additive comprising coarse particles having a median particle size between 400 microns and 2,000 microns; and
removing reaction products from the slurry phase hydrocracking reactor.
2. The process of claim 1 , wherein the slurry phase hydrocracking reactor is an upflow bubble column reactor.
3. The process of claim 1 , wherein the slurry phase hydrocracking reactor is a circulating ebullated bed reactor.
4. The process of claim 1 , wherein the heavy hydrocarbon feedstock comprises of a mineral oil, synthetic oil, heavy oil, residual oil, waste oil, shale oil, used oil, tar sand oil, coal oil, coal tar, vacuum residue, atmospheric residue, deasphalted bottoms, comminuted coal, biomass-derived materials, and mixtures thereof.
5. The process of claim 1 , wherein the heavy hydrocarbon feedstock comprises vacuum residue.
6. The process of claim 1 , wherein the first additive is introduced to the feedstock in a feed mixing vessel.
7. The process of claim 1 , wherein the second additive is introduced to the fines-loaded feedstock immediately upstream of the pre-heat exchanger in a feed preheat train.
8. The process of claim 1 , wherein the second additive is introduced to the fines-loaded feedstock immediately upstream of a feed furnace in a feed preheat train.
9. The process of claim 1 , wherein the second additive is introduced immediately upstream of the slurry phase hydrocracking reactor.
10. The process of claim 1 , wherein the second additive is introduced at a feed inlet of the slurry phase hydrocracking reactor.
11. The process of claim 1 , wherein the second additive is introduced at a feed inlet of a second or subsequent slurry phase hydrocracking reactor when multiple reactors in series are employed.
12. The process of claim 1 , wherein the first additive comprises 0.1-5 wt % of said fines-loaded feedstock.
13. The process of claim 1 , wherein the first additive comprises less than 2.5 wt % of said fines-loaded feedstock.
14. The process of claim 1 , wherein the first additive comprises less than 1 wt % of said fines-loaded feedstock.
15. The process of claim 1 , wherein the first additive comprises activated carbon.
16. The process of claim 1 , wherein the first additive comprises modified activated carbon.
17. The process of claim 1 , wherein the second additive comprises activated carbon.
18. The process of claim 1 , wherein the second additive comprises modified activated carbon.
19. The process of claim 1 , wherein the first additive comprises of one or more of hydrotreating catalyst, spent catalyst, red mud, iron (III) oxide, blast furnace dust, activated coke from hard coal or lignites, carbon black (soot), ashes from gasification processes of crude oil, silicon oxides, other inorganic minerals containing iron, and mixtures thereof.
20. The process of claim 1 , wherein the second additive comprises of one or more of hydrotreating catalyst, spent catalyst, red mud, iron (III) oxide, blast furnace dust, activated coke from hard coal or lignites, carbon black (soot), ashes from gasification processes of crude oil, silicon oxides, other inorganic minerals containing iron, and mixtures thereof.
21. The process of claim 1 , wherein the second additive comprises a median particle size between 800 microns and 1,200 microns.
22. The process of claim 1 , wherein the first additive comprises between 60 wt % and 90 wt % of total first and second additives.
23. The process of claim 1 wherein the heavy oil feedstock comprises a vacuum residue and between 1 wt % and 30 wt % lignin.