Details

Autor(en) / Beteiligte

• Lim, Hyunji
• Kim, Kwanghwi
• Kim, Jieun
• Park, Hyun Sic
• Kang, Jo Hong
• Park, Jinwon
• Song, Hojun

Titel

Experimental study of hollow fiber membrane contactor process using aqueous amino acid salt-based absorbents for efficient CO2 capture

Ist Teil von

• Journal of environmental chemical engineering, 2024-10, Vol.12 (5), p.113338, Article 113338

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Gas–liquid membrane contactors are a promising alternative to packed columns that suffer from channeling, bubble formation, and flooding problems. In this study, potassium serinate + piperazine (PSZ) and potassium alaninate + piperazine (PAZ), which are amino acid salts with good CO2 absorption performances and high surface tensions, are investigated to determine the effects of the operating parameters on the CO2 removal efficiency, CO2 absorption flux, CO2 loading, and overall mass-transfer coefficient in the membrane contactor process. The experimental results demonstrate that the 2.5 M PSZ and 2.5 M PAZ absorbents outperform 2.5 M monoethanolamine (MEA) under various operating conditions, including the gas flow rate, liquid flow rate, CO2 concentration, and CO2-loaded absorbent. Based on these results, an expression for predicting the CO2 loading from the pH is proposed. The amount of cross-over confirmed that amino acids with high surface tension have better resistance to membrane wetting than 2.5 M MEA. In addition, empirical correlation expressions were established from the results of several operating parameters. The absolute average deviation (AAD) values were 6.50 %, 2.95 %, and 4.71 % for 2.5 M MEA, 2.5 M PSZ, and 2.5 M PAZ, respectively, suggesting good agreement between the theoretical and experimental results. [Display omitted] •Amino acid salt-based absorbents were applied in a membrane contactor.•Various operating parameters were examined during the membrane contactor process.•Cross-over was measured to explain membrane wetting.•Expression for predicting CO2 loading from pH is proposed.•Empirical correlation equation for CO2 removal efficiency is established.