Integrated processes and systems for conversion of methane to multiple higher hydrocarbon products
Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products.
1. A method of producing a plurality of hydrocarbon products, the method comprising:
using an oxidative coupling of methane (OCM) catalytic reactor to convert methane and a source of oxidant to a first product gas comprising ethylene;
introducing separate portions of the first product gas into a first catalytic reaction system and a second catalytic reaction system, wherein:
the first catalytic reaction system comprises a dimerization reactor configured to convert ethylene into a second product gas comprising butene, and
the second catalytic reaction system comprises a metathesis reactor configured to convert ethylene and butene into a third product gas comprising propylene.
2. The method of claim 1 , further comprising introducing an additional portion of the first product gas into a third catalytic reaction system.
3. The method of claim 2 , further comprising introducing a further additional portion of the first product gas into a fourth catalytic reaction system.
4. The method of claim 1 , wherein the OCM catalytic reactor comprises nanowire catalyst materials.
5. The method of claim 1 , wherein the first product gas comprises less than 5 mol % of ethylene.
6. The method of claim 1 , wherein the first product gas comprises less than 3 mol % of ethylene.
7. The method of claim 1 , wherein the f product gas further comprises one or more gases selected from CO 2 , CO, H 2 , H 2 O, C 2 H 6 , CH 4 and C 3+ hydrocarbons.
8. The method of claim 1 , further comprising: prior to introducing the separate portions of the first product gas into the first catalytic reaction system and the second catalytic reaction system, generating an effluent stream from the first product gas, which effluent stream has a higher concentration of ethylene than the first product gas.
9. The method of claim 1 , further comprising introducing an effluent gas from the first catalytic reaction system or the second catalytic reaction system into the OCM catalytic reactor.
10. A processing system, the processing system comprising:
an oxidative coupling of methane (OCM) catalytic reactor comprising an OCM catalyst, wherein the OCM catalytic reactor is fluidly connected at an input, to a source of methane and configured to convert at least a portion of methane from the source of methane to a first product gas comprising ethylene;
a first catalytic reaction system comprising a dimerization reactor configured to convert ethylene to butene;
a second catalytic reaction system comprising a metathesis reactor configured to convert ethylene and butene into propylene, wherein the second catalytic reaction system is arranged in parallel to the first catalytic reaction system; and
a selective coupling between the OCM catalytic reactor and the first and the second catalytic reaction systems, wherein the selective coupling is configured to selectively direct a portion or all of the first product gas from the OCM catalytic reactor to each of the first and the second catalytic reaction systems.
11. The system of claim 10 , wherein the OCM catalyst comprises a nanowire catalyst.
12. The system of claim 10 , further comprising an ethylene recovery system fluidly coupled to the OCM catalytic reactor and the first and the second catalytic reaction systems, the ethylene recovery system configured to produce an effluent stream from the first product gas, wherein the effluent stream has a higher concentration of ethylene than the first product gas.
13. The method of claim 1 , further comprising introducing at least a portion of the second product gas into the second catalytic reaction system.
14. The method of claim 1 , wherein the second product gas comprises substantially all butene, and the third product gas comprises substantially all propylene.
15. The method of claim 14 , wherein a propylene yield of the third product gas is about 90 wt %.
16. The method of claim 1 , wherein the source of oxidant comprises oxygen (O 2 ).
17. The method of claim 1 , wherein the OCM catalytic reactor is operated at a reactor inlet temperature of 400° C. to 600° C.
18. The method of claim 17 , wherein the OCM catalytic reactor achieves a methane conversion of at least 10% per process pass.
19. The method of claim 17 , wherein the OCM catalytic reactor achieves a C 2+ selectivity of at least 50%.
20. The method of claim 1 , wherein the OCM catalytic reactor is operated at a reactor inlet pressure of 15 psig to 150 psig.
21. The method of claim 20 , wherein the OCM catalytic reactor achieves a methane conversion of at least 10% per process pass.
22. The method of claim 20 , wherein the OCM catalytic reactor achieves a C 2+ selectivity of at least 50%.
23. The method of claim 1 , wherein the OCM catalytic reactor comprises an isothermal reactor system or an adiabatic reactor system.
24. The method of claim 7 , further comprising separating ethane from the first product gas and recycling the ethane to the OCM catalytic reactor.