investigating of carbon dioxide absorption process using ammonia activated tertiary alkanolamine

Considering the slow reaction kinetics of tertiary alkanolamines with carbon dioxide, in this study, ammonia additive (nh3) has been used as a rate promoter for co2 absorption by triethanolamine (tea) solvent. the experiments were performed in a t-shaped microchannel with a circular cross-section. effect of five independent variables including: temperature (20-40 ℃), ammonia concentration (0-5 wt.%), triethanolamine concentration (10-30 wt.%), gas flow rate (150-250 ml/min) and liquid flow rate (2-6 ml/min) on co2 absorption efficiency (η) was investigated. the results showed that in the ammonia concentration range of 0-4 wt.%, adding ammonia to tea leads to an increase in co2 absorption efficiency from 33.91% to 93.52%, but in higher concentrations (4-5 wt.%), the adding ammonia is accompanied by a decrease in co2 absorption efficiency.