| 摘要 |
The invention relates to a process for separating carbon dioxide, CO2, from combustion gas, in which process: the combustion gases entering the process are brought to a high pressure, and they are washed (10.1) with a solvent, to transfer the CO2 from the combustion gases to the solvent, and the combustion gases are removed from the process after washing, and the solvent is led from the washing process to a lower pressure evaporation process (12, 13), in which the CO2 is separated from the solvent and led out of the process, and the solvent is pumped back into the dissolution process, and a solvent, such as methanol, which has a strong CO2 solubility pressure gradient, deviating from Henry's law, over a suitable temperature range, is selected as the washing liquid. The dissolution and evaporation are carried out nearly isothermally in the said temperature range near the condensation point of CO2 at the partial pressure of CO2 used in the process, and thermodynamically in nearly reversible conditions. |
