A novel rate of the reaction between NaOH with CO2 at low temperature in spray dryer

- The effect of absorbent concentration, operating temperature and nozzle diameter is investigated.
- A new rate of the reaction between NaOH and CO2 is proposed.
- The proposed model satisfactorily simulates the experimental data and it is reliable.

Carbon dioxide (CO2) is an influential greenhouse gas that has a significant impact on global warming partly. Nowadays, many techniques are available to control and remove CO2 in different chemical processes. Since the spray dryer has high removal efficiency rate, a laboratory-scale spray dryer is used to absorb carbon dioxide from air in aqueous solution of NaOH. In the present study, the impact of NaOH concentration, operating temperature and nozzle diameter on removal efficiency of CO2 is explored through experimental study. Moreover, the reaction kinetic of NaOH with CO2 is studied over the temperature range of 50-100 °C in a laboratory-scale spray dryer absorber. In the present contribution, a simple reaction rate equation is proposed that shows the lowest deviation from the experimental data with error less than 2%.