Results of RITE's Advanced Liquid Absorbents Develop for Low Temperature CO2 Capture

Abstract In the present paper, we investigated CO 2 capture with six amine based absorbents, including three formulated solvents. Aqueous solutions of the amines (mass fraction; 30% for single amine and >30% for blended solvents) were used to evaluate the performance for CO 2 capture. Gas scrubbing, vapor-liquid equilibrium (VLE), and reaction calorimetry experiments were conducted in the laboratory to obtain the absorption rate, the amount of CO 2 absorbed, cyclic CO 2 capacity, and heat of reaction for each absorbent. The results of these absorbents were compared with the conventional amine absorbents (MEA, AMP, DEA, and MDEA). Three high performing formulated absorbents (RN-1, RN-2, and RN-3) were developed, and these had lower heats of reaction, higher cyclic capacities, and comparable absorption rates compared with MEA. Some blended solvents were already demonstrated with real blast furnace gas at pilot test plants with capacities of 1 ton-CO 2 /day and 30 ton-CO 2 /day and showed promising results in terms of reducing absorbent regeneration energy.