Oxidative coupling of methane methods and systems
The present disclosure provides natural gas and petrochemical processing systems including oxidative coupling of methane reactor systems that integrate process inputs and outputs to cooperatively utilize different inputs and outputs of the various systems in the production of higher hydrocarbons from natural gas and other hydrocarbon feedstocks.
1. A method for producing methanol (MeOH) and hydrocarbon compounds containing at least two carbon atoms (C 2+ compounds), comprising:
(a) directing methane (CH 4 ) and oxygen (O 2 ) into an oxidative coupling of methane (OCM) reactor to produce a product stream comprising the C 2+ compounds, carbon monoxide (CO), hydrogen (H 2 ), carbon dioxide (CO 2 ), and un-reacted CH 4 ;
(b) generating a first effluent stream comprising the CO 2 from the product stream, wherein a concentration of the CO 2 in the first effluent stream is greater than a concentration of CO 2 in the product stream;
(c) generating a second effluent stream comprising H 2 , CO, and un-reacted CH 4 from the product stream;
(d) generating a third effluent stream comprising C 2+ compounds; and
(e) directing the first effluent stream and the second effluent stream to an MeOH reactor to produce MeOH.
2. The method of claim 1 , wherein a concentration of the un-reacted CH 4 in the second effluent stream is greater than a concentration of the un-reacted CH 4 in the product stream.
3. The method of claim 2 , further comprising directing at least a portion of the second effluent stream to a steam methane reformer (SMR) that produces hydrogen (H 2 ) and CO.
4. The method of claim 3 , further comprising directing the CO and H 2 produced in the SMR to the MeOH reactor.
5. The method of claim 4 , wherein all of the CO and H 2 from the product stream and all of the CO and H 2 from the SMR is converted to MeOH in the MeOH reactor.
6. The method of claim 3 , wherein at least a portion of the second effluent stream is provided as fuel to the SMR.
7. The method of claim 3 , wherein the at least a portion of the second effluent stream is provided as feedstock to the SMR, and wherein the SMR converts the un-reacted CH 4 in the second effluent stream into H 2 and CO for conversion to MeOH in the MeOH reactor.
8. The method of claim 3 , wherein at least about 95% of the methane is converted into MeOH and C 2+ compounds.
9. The method of claim 1 , further comprising providing the third effluent stream comprising C 2+ compounds to a cracker that cracks or refines the C 2+ compounds.
10. The method of claim 3 , wherein at least 80% of the methane consumed by the SMR is from the second effluent stream.
11. The method of claim 3 , further comprising directing a portion of the second effluent stream to a cracker.
12. The method of claim 11 , wherein at least 80% of the methane consumed by the SMR and the cracker is from the second effluent stream.
13. The method of claim 11 , further comprising directing at least a portion of the second effluent stream to a methane-consuming process, and wherein at least 80% of the methane consumed by the SMR, the cracker, and the methane-consuming process is from the second effluent stream.