CESAR1 solvent degradation in pilot and laboratory scale

• 35 compounds identified in a sample from pilot-scale post-combustion operation. • 14 compounds not previously identified. • All main nitrogen containing degradation compounds identified. A sample of CESAR1 solvent, aqueous solution of 3 M 2-amino-2-methyl-propanol (AMP) and 1.5 M piperazine, which had been subjected to a series of test campaigns with industrial flue gases was analysed for identified degradation compounds with newly developed analytical techniques. A total of 35 degradation compounds were found in the solvent sample, whereof 14 have not previously been identified in CESAR1 from pilot-scale CO 2 capture operation. Three new major degradation compounds were found among the ten most abundant degradation species. By comparing the quantified solvent amines and degradation compounds with the total concentration of nitrogen in the sample, it was found that all major nitrogen containing degradation compounds are accounted for, and that the nitrogen containing species in the solvent have been identified and quantified within the analytical uncertainty. This contributes to closing one of the major knowledge gaps associated with CO 2 capture operations with the CESAR1 solvent, which is a target of the Horizon Europe project AURORA.