FIELD: gas systems.
SUBSTANCE: invention relates to a process for treating a feed gas, where a feed gas stream is provided and the feed gas stream is directed to an extraction plant for extracting natural gas liquids; in the extraction unit, the feed gas stream is cooled and preferably at least partially liquefied, at least one stream obtained from the cooled feed gas stream is expanded in the expansion unit and separated in the separation column, and after separation, the treated gas stream and the stream of natural gas liquids are recovered; compressing the treated gas stream in at least one compressor of the compression unit to obtain a compressed treated gas stream; in a fractional unit, a natural gas liquid stream is separated into a plurality of hydrocarbon fractions. And a recycle stream is taken from the compressed treated gas stream; and reintroducing the recycle stream without cooling it into the feed gas stream upstream of the extraction unit, into the cooled feed gas stream or into the stream obtained from the cooled feed gas stream upstream of the expansion means. The invention also relates to a plant for processing the feed stream.
EFFECT: recovery of natural gas liquids contained in the feed gas with very different contents, recovery of light natural gas compounds in relation to heavier compounds, which may not be desirable, low investment and operating costs.
15 cl, 3 dwg, 3 tbl
