Investigating of carbon dioxide absorptionprocess using ammonia activated tertiaryalkanolamine

Considering the slow reaction kinetics of tertiary alkanolamines with carbon dioxide, inthis study, ammonia additive (NH۳) has been used as a rate promoter for CO۲absorption by triethanolamine (TEA) solvent. The experiments were performed in a Tshapedmicrochannel with a circular cross-section. Effect of five independent variablesincluding: temperature (۲۰-۴۰ ℃), ammonia concentration (۰-۵ wt.%), triethanolamineconcentration (۱۰-۳۰ wt.%), gas flow rate (۱۵۰-۲۵۰ ml/min) and liquid flow rate (۲-۶ml/min) on CO۲ absorption efficiency (η) was investigated. The results showed that inthe ammonia concentration range of ۰-۴ wt.%, adding ammonia to TEA leads to anincrease in CO۲ absorption efficiency from ۳۳.۹۱% to ۹۳.۵۲%, but in higherconcentrations (۴-۵ wt.%), the adding ammonia is accompanied by a decrease in CO۲absorption efficiency.

کلیدواژه ها:

CO۲ ، absorption ، Microcontactor ، Aqueous ammonia ، Triethanolamine