Low temperature swing process for CO₂ absorption-desorption using phase separation CO₂ capture solvent

We have developed a phase separation solvent which transforms into two liquid phases after CO₂ absorption, in order to establish an energy-saving CO₂ capture process. The CO₂ loading changes strongly with temperature increase during the phase separation, which enables us to reduce the temperature difference between absorber and desorber. The low temperature swing process economizes the energy requirement for the CO₂ capture process with highly-effective reaction-heat recovery. We evaluated the energy consumption of the CO₂ capture process with our novel phase separation solvent based on the CO₂ solubility. The energy requirement was estimated to be as low as 1.6 GJ/ton-CO₂.