Experimental and statistical analysis of CO₂ absorption in DEA/water nanofluid containing silicon dioxide nanoparticle

Abstract

In this investigation, the equilibrium absorption of CO₂ in diethanolamine (DEA)/water solutions has been measured in the presence and absence of SiO₂ nanoparticles using the isochoric saturation method. Experiments have been performed at the temperature range of 276.1–333.1 K, initial pressure range of 4–15 bars, DEA concentrations of 10, 15, 20, and 25 wt.%, and nanoparticle concentrations of 0.5, 1.0, and 1.5 wt.%. To understand the effect of operating variables with fewer number of experiments, design of experiment has been performed using Qualitek-4 software and Taguchi algorithm. Totally, 16 experiments were suggested. According to the results, increasing the initial pressure and DEA concentration improved the solubility of CO₂ in the solvent. The optimum concentration of SiO₂ nanoparticle was 0.5 wt.%. More increase in nanoparticle concentration deteriorates the solubility of CO₂ in the solvent.

Keywords:

• Gas absorption
• nanoparticle
• SiO₂
• DEA
• ANOVA

Disclosure statement

No potential conflict of interest was reported by the author(s).