Utilization of tertiary amine solutions and ultrasound irradiation for CO₂ desorption at low temperature in a CCS process

Abstract

This study used three tertiary amine solutions as a CO2 absorbent. Ultrasound can desorb CO2 from CO2(aq) and H2CO3 species at low temperature. Tertiary amine solution with lower pKa created CO2 adsorption equilibrium at lower pH related to a higher CO2 desorption amount using 28 kHz ultrasound because the lower pH environment would increase the existence ratio of CO2(aq). Triethanolamine (TEA) with lowest pKa (7.85) showed the highest CO2 desorption ratio of 48% for 30 min irradiation at 25 °C. The CO2 absorption–desorption capacity of TEA by reuse was evaluated and found to keep the first capacity for three cycles.

CO2 desorption using ultrasound at low temperature from CO2-loaded amine solution under pressure conditions

“…In our previous work, tertiary amines were demonstrated to have a good CO 2 desorption performance by ultrasound after pressurized CO 2 loading under 0.5 MPa. 28,32) Moreover, except tertiary amine, Lv illustrated that the CO 2 absorption in primary amine MEA solution started with the formation of carbamate, and was followed by the hydrolysis of carbamate to form HCO 3 − /CO 3 2− when CO 2 loading was high of 0.4 mol/mol. 33) Yamada also found out that when the CO 2 loading ratio was more than 0.5 mol/mol-amine, a secondary amine 2-(Ethylamino)ethanol (EAE) would form HCO 3 /CO 3 2− instead of carbamate.…”

Synthesis of Pd/WO3 and Pt/WO3 composite particles by sonochemical reactions and evaluation of their photocatalytic performance

“…When these cavitation bubbles expand and contract repeatedly and then collapse suddenly, hot spots of high temperature and high pressure exceeding several thousand degrees Celsius and more than a thousand atmospheres are generated locally, thereby causing chemical and physical effects. 21,22) Research is being conducted in various fields, including organic and inorganic material synthesis, [23][24][25][26] environmental conservation, 27,28) waste treatment, [29][30][31][32] and disease treatment, 33) by applying these cavitation effects induced by ultrasound (US) irradiation in liquids. For example, when an aqueous solution containing organic compounds is irradiated with US, the H 2 O molecules in the solvent are decomposed into OH radicals and H radicals,…”

Study on the efficiency of a transducer for sonochemistry by calorimetry

“…Sonochemistry, which uses ultrasound in water to induce or enhance chemical reactions, has been applied to synthesis, [1][2][3][4][5][6] decomposition, [7][8][9] dispersion, [10][11][12] aggregation, 13,14) agitation, 15) extraction, 16) cleaning, 17,18) atomization, [19][20][21][22] CO 2 capture and storage, 23,24) and wastewater treatment. 25) The performance of a sonochemical reactor can be evaluated through dosimetry measurements of the amount of substance in the reacted material.…”