Investigation of foaming tendency of aqueous mixture of MDEA+IPAE for carbon dioxide absorption. (August 2022)

• Record Type: Journal Article
• Authors: Edalatpour, Anis; Abbasi, Mojgan; Riahi, Siavash; Sanaye Mozaffari Sabet, Nava; Tavakoli, Omid
• Is Part Of: Journal of CO₂ utilization. Volume 62(2022)
• Publication Date: 2022-08
• Subjects: Foaming -- MDEA -- IPAE -- Formaldehyde -- Formic acid -- Silicon-based antifoam; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.102079
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: This paper provides an experimental study on the foam behavior of aqueous solutions of MDEA and IPAE by the modified standard ASTM D892. The effect of different operating parameters, including temperature, amine concentration, and flow rate, in the range of 25–35 °C, 20–40 wt%, and 1–3 L/min, respectively, were studied using the response surface method. The physical properties of solutions such as viscosity, density, and surface tension were measured. At first, foam tests were performed only with MDEA, a conventional amine in gas purification, to obtain the effect of different operating conditions and their interactions on the foam volume and break time. A specific operating condition was selected based on obtained responses, and IPAE was added to MDEA. The mixture of MDEA and IPAE had better foam behavior than pure MDEA. Foam tests in the presence of formaldehyde and formic acid proved that IPAE acts as a defoamer even in the presence of impurities. A silicone antifoam was used, and there was no definite trend for foam volume, but with increasing antifoam concentration, the break time increases from 22.67 s to 150 s. Finally, 0.1 wt% antifoam was added to the combination of 15 wt% MDEA + 5 wt% IPAE + 1 wt% formaldehyde or formic acid to investigate its effect in the presence of impurities. The foam volume decreased by about 18 % in the formaldehyde-containing mixture, and the break time increased by about 61 %. Also, the foam volume was reduced by about 6 % in the formic acid mixture, and the break time increased significantly by 207 %. Highlights: Increased the foam of MDEA+IPAE in the presence of formaldehyde and formic acid. Achieved lower foam volume and better foam behavior of MDEA in the presence of IPAE. Obtained the best performance of silicon antifoam at 0.1 wt% for MDEA+IPAE mixture.