Process for upgrading hydrocarbons
View Patent ↗A process for upgrading hydrocarbons comprising removal of C5 hydrocarbons from a feedstock, metathesizing said C5 hydrocarbons to C6+ and C4− hydrocarbons, and upgrading said C4− hydrocarbons is disclosed absent any dehydrogenation.
1. A process for upgrading hydrocarbons comprising:
a) separating a first hydrocarbon stream and a remaining hydrocarbon stream from a hydrocarbon feedstock in a first separation zone, wherein said first hydrocarbon stream comprises compounds having five carbon atoms per molecule (C5);
b) reacting said first hydrocarbon stream in a metathesis reaction zone to form a metathesis reaction product stream, wherein said metathesis reaction product stream comprises compounds having less than five carbon atoms per molecule (C4−), compounds having five carbon atoms per molecule (C5), and compounds having at least six carbon atoms per molecule (C 6+ );
c) separating a second hydrocarbon stream and a third hydrocarbon stream from said metathesis reaction product stream in a second separation zone, wherein said second hydrocarbon stream comprises compounds having less than six carbon atoms per molecule (C5−) and wherein said third hydrocarbon stream comprises compounds having at least six carbon atoms per molecule (C6+);
d) separating a fourth hydrocarbon stream and a fifth hydrocarbon stream from said second hydrocarbon stream in a third separation zone, wherein said fourth hydrocarbon stream comprising compounds having less than 5 carbon atoms per molecule (C4−) and said fifth hydrocarbon stream comprising compounds having 5 atoms per molecule (C5); and
e) reacting said fourth hydrocarbon stream in a hydrocarbon upgrading zone wherein said process does not comprise dehydrogenation reactions.
2. The process in according with claim 1 further comprising step selected from a list of steps consisting of i) passing said third hydrocarbon stream to a gasoline blending zone; ii) recycling said fifth hydrocarbon stream to said metathesis reaction zone; iii) passing said remaining hydrocarbon stream in first separation zone to said gasoline blending zone; and any combination thereof.
3. A process in accordance with claim 1 wherein said hydrocarbon upgrading zone is an alkylation reaction zone.
4. A process in accordance with claim 1 wherein said hydrocarbon upgrading zone is an oligomerization reaction zone.
5. A process in accordance with claim 1 wherein said metathesis reaction conditions include a reaction temperature in the range of from about 700° F. to about 800° F.
6. A process in accordance with claim 1 wherein said metathesis reaction conditions include a metathesis catalyst.
7. A process in accordance with claim 6 wherein said metathesis catalyst comprises silica, tungsten oxide, and magnesium oxide.
8. A process in accordance with claim 6 wherein said metathesis catalyst is regenerated with hydrogen.
9. A process in accordance with claim 1 wherein said hydrocarbon feedstock comprises compounds with 2 to 20 carbon atoms per molecule.
10. A process in accordance with claim 1 wherein said hydrocarbon feedstock contains less than 300 ppmw dienes.
11. A process in accordance with claim 1 wherein said hydrocarbon feedstock contains less than 100 ppmw dienes.
12. A process in accordance with claim 1 wherein said hydrocarbon feedstock contains less than 30 ppmw sulfur.
13. A process in accordance with claim 1 wherein said hydrocarbon feedstock contains less than 10 ppmw sulfur.
14. A process in accordance with claim 1 wherein said hydrocarbon feedstock contains less than 5 ppmw sulfur.
15. A process in accordance with claim 1 , wherein said fourth hydrocarbon stream is fed into an alkylation unit to provide high octane blendstocks.
16. A hydrocarbon product stream prepared by the steps of:
a) separating a first hydrocarbon stream and a remaining hydrocarbon stream from a hydrocarbon feedstock in a first separation zone, wherein said first hydrocarbon stream comprises compounds having five carbon atoms per molecule (C5);
b) reacting said first hydrocarbon stream in a metathesis reaction zone to form a metathesis reaction product stream, wherein said metathesis reaction product stream comprises compounds having less than five carbon atoms per molecule (C4−), compounds having five carbon atoms per molecule (C5), and compounds having at least six carbon atoms per molecule (C 6+ );
c) separating a second hydrocarbon stream and a third hydrocarbon stream from said metathesis reaction product stream in a second separation zone, wherein said second hydrocarbon stream comprises compounds having less than six carbon atoms per molecule (C5−) and wherein said third hydrocarbon stream comprises compounds having at least six carbon atoms per molecule (C6+);
d) separating a fourth hydrocarbon stream and a fifth hydrocarbon stream from said second hydrocarbon stream in a third separation zone, wherein said fourth hydrocarbon stream comprising compounds having less than 5 carbon atoms per molecule (C4−) and said fifth hydrocarbon stream comprising compounds having 5 atoms per molecule; and
e) Reacting said fourth hydrocarbon stream in a hydrocarbon upgrading zone wherein said process does not comprise dehydrogenation reactions do not occur.