Systems and methods of renewable natural gas processing
Example gas recovery systems include a source gas conditioning assembly configured to condition and compress the inlet source gas to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO 2 ) plant assembly fluidly coupled to the recovery stream configured to provide a carbon dioxide product stream and an enriched recycle stream, a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream, and wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream.
1. A carbon dioxide recovery system, comprising:
a primary recovery system comprising a plurality of membranes;
a carbon dioxide (CO 2 ) plant assembly fluidly coupled to a permeate of a membrane of the plurality of membranes, the CO 2 plant assembly configured to provide a liquid CO 2 product stream and a non-condensable stream; and
a standalone membrane assembly fluidly coupled to the non-condensable stream, and configured to separate the non-condensable stream into a hydrocarbon enriched stream and a CO 2 enriched stream, wherein the CO 2 plant assembly is fluidly coupled to the CO 2 enriched stream.
2. The carbon dioxide recovery system of claim 1 , wherein the membrane of the plurality of membranes comprises a first sequential membrane.
3. The carbon dioxide recovery system of claim 1 , wherein the membrane of the plurality of membranes comprises a second sequential membrane.
4. The carbon dioxide recovery system of claim 1 , further comprising:
wherein the primary recovery system comprises an adsorption component; and
wherein the adsorption component is at least selectively coupled to the CO 2 enriched stream as a flush gas.
5. The carbon dioxide recovery system of claim 1 , further comprising:
wherein the primary recovery system is fluidly coupled to the hydrocarbon enriched stream as a recycle gas.
6. The carbon dioxide recovery system of claim 1 , wherein the non-condensable stream is not pressurized between the CO 2 plant assembly and the standalone membrane assembly.