| 摘要 |
The invention relates to a process for recovering one or more monomers from a gas stream (1), comprising the following steps: within one and the same first extraction column C1, a) a step of extraction by bringing into contact, in an extraction column (C1) the gas stream (1) with an organic extraction solvent (2), in which said extraction solvent (2) absorbs said monomer or monomers, and b) a step of stripping or of desorption with an inert gas in the extraction column (C1) via the feed at the bottom of the column (C1), and below the feed of the monomer-laden gas stream (1), via a stream of inert gas, preferably of nitrogen or a stream of nitrogen-enriched gas (12), a liquid stream (3) comprising the extraction solvent and the monomer or monomers being recovered at the bottom of the column (C1), an outgoing gas stream (4) being recovered at the top of the column (C1), then within a second recovery column C2, c) a step of recovering said monomer or monomers in which said monomer or monomers are separated from the extraction solvent by distillation in a recovery column (C2) fed by the liquid stream (3) recovered at the bottom of the column (C1), a stream comprising the concentrated monomer(s) (5) being recovered at the top of the column (C2), and a liquid stream (2) comprising the extraction solvent being recovered at the bottom of the column (C2) then recycled to the top of the column (C1), the monomer or monomers being chosen from dienes, vinyl aromatics and isobutene.
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