Polymer Bulletin

, Volume 76, Issue 1, pp 103–118 | Cite as

Calcium alginate gel and hard beads for the removal of total organic acid anions and heavy metal ions from industrial lean methyldiethanolamine solvent

  • Priyabrata PalEmail author
  • Anjali Achazhiyath Edathil
  • Fawzi BanatEmail author
Original Paper


Bio-polymeric adsorbents such as calcium alginate gel (CAG) and hard (CAH) beads were prepared to remove both the total organic acid anions (formate, acetate, propionate, etc.) and the heavy metal ions (chromium and iron) simultaneously from industrial lean methyldiethanolamine (MDEA) solvent used in the natural gas sweetening industry. These are undesirable products accumulated in the process which leads to solvent losses and contribute operational problems such as corrosion, fouling and foaming. The adsorbents were characterized using TGA, FTIR and SEM analyses. Kinetic and equilibrium studies at different temperatures including regeneration of the adsorbents were carried out. The maximum uptake capacity for the total organic acid anions using the CAG and CAH adsorbents at 23 °C was found to be 322.58 and 19.72 mg/g, respectively. Based on the high uptake, feasibility and recyclability, calcium alginate beads exhibit a great potential for MDEA solvent purification.


Natural gas sweetening Adsorption Biopolymers Organic acid anions Metal ions 



The authors are grateful to the Gas Processing and Materials Science Research Center (GRC), Khalifa University, Abu Dhabi, for funding the project under grant number GRC006. Sincere thanks to the GASCO Company (Abu Dhabi) for their continued cooperation and support. We would like to thank Dr. Mark Wyatt, for checking the English language of the manuscript.

Supplementary material

289_2018_2376_MOESM1_ESM.docx (2.5 mb)
Supplementary material 1 (DOCX 2604 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKhalifa University of Science and TechnologyAbu DhabiUnited Arab Emirates

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