Pre-purification, Enrichment, Extraction, Capture

If CO2 sources with low partial pressure ( 1 bar) are utilised an additional process step for the extraction or enrichment of the CO2 has to be applied upstream of the liquefaction unit. Most commonly an absorption process (CO2 scrubbing) is used but a pressure swing adsorption (PSA) process (cf Section 5.2.3.4) or a combination of partial condensation and wash unit can also be applied. [Pg.191]

The scrubbing unit consists of an absorption column, where the CO2 is absorbed in a wash liquid and a regeneration column, where the CO2 is stripped from the wash liquid. [Pg.191]

The feed gas enters the absorption column at the bottom and is absorbed in the lean wash liquid, which flows countercurrently from the top to the bottom of the column. On top of the column traces of wash liquid are removed from the residual gas by means of fresh water. [Pg.191]

This process is typical for a number of wash liquids but mainly amine solvents. Depending on the selected solvent some additional equipment is required, i.e. [Pg.191]

A large variety of wash liquids are available which can be divided into physical absorbents and chemical absorbents [6.17]. [Pg.191]

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