Pilot-scale assessment of a phase-change CO2 capture solvent and process in the presence of sulfuric and nitric ions
Year: 2025
Type: article
Abstract: Phase-change solvents (PCS) are a promising alternative for reducing the high energy requirements of post-combustion CO 2 capture processes. This work presents the pilot-scale evaluation of the novel PCS N‐cyclohexyl‐1,3‐propanediamine (S 1 N)/N,N-dimethylcyclohexylamine (DMCA) for CO 2 absorption/desorption in the presence of sulfuric and nitric anions that are found in industrial flue gases. The testing is performed by dissolving a total of 1.7 wt% of sulfuric and nitric acid in the solvent bulk, which corresponds to a large concentration of pollutants that may accumulate in the solvent after long operation. Absorption and regeneration efficiency, cyclic capacity, reboiler duty, and regeneration energy requirements are investigated as key performance indicators (KPI) for the capture process. The performance of S 1 N/DMCA is investigated with and without the anions for 5, 9 and 12 vol% CO 2 concentrations in the flue gas and is compared with the benchmark aqueous monoethanolamine (MEA) 30 wt% in the presence of anions. The results indicate that the anion pollutants induced a 7.5 % reduction of absorption efficiency, 23 % reduction of cyclic capacity, up to 35 % increased reboiler duty, and up to 20 % increased regeneration energy requirements. However, the PCS still achieved 70 % higher cyclic capacity and 60 % lower energetic demands compared to MEA.
Source: Chemical Engineering Science
Authors: Evie Nessi, Thanos Psaroudas, Panagiotis Kazepidis, Spyros Voutetakis, Athanasios I. Papadopoulos, Panos Seferlis
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,050
OpenAlex ID: W7094957104