Study of Degradation and Heat of Dissolution of Solids in Aqueous Blend of AMP and KSAR Loaded with CO2

An example of a novel precipitating solvent system (NPSS) developed at SINTEF [1] has been further characterized in this work. Chemical stability under thermal and oxidative conditions have been measured to respectively 12% and 8% loss of amine and aminoacid. The results were compared with literature data for single solvent components (AMP, sarcosine) or blends containing one of the components. Further, in order to estimate heat requirements for the dissolution of precipitate formed in the absorber, heat of dissolution of solids in water and in unloaded AMP-KSAR solution has been measured at 40 oC in a reaction calorimeter CPA202. The results show that about 2 times less heat is required to dissolve the precipitate formed with NPSS, AMP bicarbonate, compared to potassium bicarbonate crystals when dissolution is in water. At the same time, heat of dissolution of the NPSS precipitate into the unloaded AMP-KSAR solution is about 2 times lower than heat of its dissolution in water.