| 摘要 |
Known processes for removing CO2 from gas mixtures through absorption in KOH or NaOH solutions are carried out until all hydroxil ions are converted into carbonates. The new process should reduce energy and equipment requirements for carbon dioxide removal thanks to a continuous and cost-effective regeneration of the washing solution. A high hydroxil ion concentration in the washing medium is crucial to achieve a good separation rate and thus low energy and equipment costs when absorbing CO2 in KOH or NaOH solutions. The presence of other ions plays only a secondary role. By adding alkaline earth oxides or hydroxides to the washing solution, carbonate ions may be partially precipitated and hydroxyil ions may be partially regenerated. A KOH/K2CO3 or NaOH/Na2CO3 solution with a high hydroxil ion concentration is thus obtained for absorbing CO2. The invention is useful to remove carbon dioxide from gas mixtures with low energy consumption. |
