Abstract
Understanding the solid-liquid phase boundaries for CO2 capture solvents are important for the prevention of solid formation doing process operation. Solid formation in e.g. absorber, and stripper may lead to costly shut-downs. The objectives of this study has been to determine the solid-liquid equilibrium (SLE) of 2-amino-2-methyl-1-propanol (AMP)-water and AMP-CO2-water and to create a deeper understanding of the interactions between AMP and water and AMP, CO2, and water. The aim is to generate a deeper understanding of the AMP-water and the AMP-CO2-water interactions in order to create better thermodynamic modelling of the CO2 capture process. The presented results is based on newly published data [1] for the aqueous AMP system and additional unpublished results for the AMP-CO2-water system. We have used experimental techniques such as powder x-ray diffraction (PXRD), freezing point depression, and solid phase boundary equilibrium determinations. We found a new crystal structure, AMP tetrahydrate (AMP·4H2O) and several eutectic points in the AMP-water system. We extended our work compared to the recent publication, saturating a 30 wt% aqueous AMP solution with CO2. We found a new crystal structure using powder x-ray diffraction (PXRD). The new structure is an AMPH-HCO3 hydrate.
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