Heavy hydrocarbon processing in NGL recovery system

摘要

A method for processing heavy hydrocarbons in an NGL recovery system is provided. In one embodiment, a feed stream is separated into a carbon dioxide recycle stream and a heavy hydrocarbon stream. The heavy hydrocarbon stream comprises carbon dioxide and natural gas liquids, and the heavy hydrocarbon stream comprises heavy hydrocarbons. The carbon dioxide recycle stream is separated into a purified carbon dioxide recycle stream and a natural gas liquids stream. The purified carbon dioxide recycle stream comprises the carbon dioxide, and the natural gas liquids stream comprises the natural gas liquids. In another embodiment, a set of process equipment comprises a first separator and a second separator. The first separator is configured to separate a feed stream into a recycle stream and a heavy hydrocarbons stream, and the second separator is configured to separate the recycle stream into a purified recycle stream and a natural gas liquids stream.

主权项

1. A method comprising:
separating a feed stream into a carbon dioxide recycle stream and a heavy hydrocarbon stream, wherein the carbon dioxide recycle stream comprises carbon dioxide and natural gas liquids, and wherein the heavy hydrocarbon stream comprises substantially all C9+hydrocarbons from the feed stream; separating the carbon dioxide recycle stream into a purified carbon dioxide recycle stream and a natural gas liquids stream, wherein the purified carbon dioxide recycle stream comprises the carbon dioxide, wherein the natural gas liquids stream comprises the natural gas liquids, and wherein the natural gas liquids stream is substantially free of C9+hydrocarbons; separating the natural gas liquids stream into an acid gas stream and a sweetened natural gas liquids stream; separating the sweetened natural gas liquids stream into a light natural gas liquids stream and a heavy natural gas liquids stream after the acid gas stream has been separated from the natural gas liquids stream; and combining the heavy natural gas liquids stream with the heavy hydrocarbon stream that comprises substantially all C9+, hydrocarbons from the feed stream to generate an upgraded natural gas liquids stream.