Abstract
To develop a novel chemical CO2 solvent showing high efficiency for the separation of CO2 from high-pressure exhaust gases, such as integrated gasification combined cycle (IGCC) produced gases, tertiary amine solutions were evaluated from CO2 absorption and desorption rates, and CO2 recovery under the pressure of 1.6 MPa-CO2. Our novel developed solvent RH-2b shows a high CO2 recovery and high CO2 absorption and desorption rates; these values are approximately three times higher than those with a methyldiethanolamine solution, thus meaning that our solvent can recover CO2 with low energy under high pressure. The total energy for CO2 separation and capture including the compression process, was calculated using the measured values of CO2 recovery and reaction heat of RH-2b. RH-2b is able to reduce the total energy by approximately 19% from that with a methyldiethanolamine solution. Additionally, the pressurized desorption process to 4.0 MPa-CO2 is estimated to reduce the total energy for CO2 separation and capture including the compression process to 1.6 GJ/t-CO2.
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