**3.5. Purisol™**

The Purisol™ process is particularly suited to treat high-pressure, high CO2 synthesis gas from IGCC systems because of the high selectivity for H2 S. This technology is licensed by Lurgi AG and employs N-methyl pyrrolidone.

In the Purisol™ process, H2 S removal is not required prior to CO2 absorption occurring. The process can be operated at 50 bar and either at ambient temperature or with refrigeration down to about −15°C. The CO<sup>2</sup> desorption is accomplished by stripping with an inert gas [63].
