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Reduction of the energy penalty and cost of CO 2  capture from concentrated gas streams using amine-based solutions can be achieved by minimizing the energy penalty in the solvent regeneration process. High concentration 2-Amino-2-methyl-1-propanol (AMP) solution precipitates as a carbonate when enough CO 2  has been absorbed. By sending the separated carbonate to the stripper, the sensible heat of regeneration can be reduced. However, previous testing using 50 weight percent AMP solution mixed with Piperazine (PZ) with solid-liquid separation showed that the CO 2  recovery rate was limited to 65% due to the lack of PZ regeneration. To improve the CO 2  recovery rate, a novel solution and injection process were developed. N-Methyl-1,3-diaminopropane (MAPA) was selected as an alternative promoter based on reaction rate testing. Various tests were employed to characterize the behaviour of the AMP/MAPA solution under CO 2  capture and recovery conditions. The injection point was relocated to avoid the inhibition of CO 2  absorption observed when CO 2  semi-lean liquid was sent to the upper portion of the absorber. The CO 2  recovery rate and the precipitation quantity were simulated using a model built in Aspen Plus®. The novel solution and injection set-up were evaluated experimentally by a bench-scale apparatus.

Performance Evaluation of Phase Separation Process Using High-concentration AMP Promoted by MAPA for CO2 Capture

Performance Evaluation of Phase Separation Process Using High-concentration AMP Promoted by MAPA for CO₂ Capture