This paper presents a summary of technical-economic studies. It allows evaluating, in the French context, the production cost of electricity derived from coal and gas power plants with the capture of CO 2 , and the cost per ton of CO 2 avoided. Three systems were studied: an Integrated Gasification Combined Cycle (IGCC), a conventional combustion of Pulverized Coal (PC) and a Natural Gas Combined Cycle (NGCC). Three main methods were envisaged for the capture of CO 2 : pre-combustion, post-combustion and oxy-combustion.For the IGCC, two gasification types have been studied: a current technology based on gasification of dry coal at 27 bars (Shell or GE/Texaco radiant type) integrated into a classical combined cycle providing 320 MWe, and a future technology (planned for about 2015-2020) based on gasification of a coal -water mixture (slurry) that can be compressed to 64 bars (GE/Texaco slurry type) integrated into an advanced combined cycle (type H with steam cooling of the combustion turbine blades) producing a gross power output of 1200 MWe.

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The kinetics of CO 2 absorption by aqueous solutions of methyl diethanol amine (MDEA) were measured in the temperature range (296-343) K and MDEA concentration range (830-4380) mol‚m -3 (10-50 mass %). A thermoregulated constant interfacial area Lewis-type cell was operated by recording the pressure drop during batch absorption. The kinetic results are in agreement with a fast regime of absorption according to film theory. MDEA depletion at the interface has a significant effect on the kinetics at the CO 2 pressures (100 to 200 kPa) studied in this work, especially at low temperatures and low MDEA concentrations. Considering only the reaction between CO 2 and MDEA, the CO 2 absorption appears as a first-order reaction with respect to MDEA. The activation energy found for the reaction between CO 2 and MDEA is 45 kJ‚mol -1 , but this value depends significantly (by about 10% in the worst case) on the vapor-liquid equilibrium data used.