**3.4. Fluor™**

Fluor™ process is the most suitable physical absorption process to be applied for high CO2 partial pressure syngas streams and has been in use since the late 1950s. Fluor™ is licensed by Fluor Daniel, Inc. and employs propylene carbonate (C4 H6 O3 ) as solvent (available as JEFFSOL™ PC solvent), which has a lower vapor pressure than those used by Rectisol™ and Selexol™. The solvent requires neither a low nor no presence of H2 S and can be applied in large CO2 removal applications [60, 61].

In the Fluor™ process, physical absorption occurs at moderate to high-pressure, ranging between 30 and 80 bar, and at ambient temperature. The flue gas must be dehydrated before the gas enters into the absorption column to prevent water build-up in the solvent. As indicated before, H2 S must also be removed before the CO2 absorption occurs. After CO2 is absorbed, the CO2 loaded solvent is flashed to release CO<sup>2</sup> and recovers its original capacity. The lean solvent is recycled back to the absorber, whereas the high purity CO2 exits the regeneration stages to be compressed and stored [62].
