Research on oxygen solubility in aqueous amine solvents with common additives used for CO2 chemical absorption

Thomas B. Jorgensen, Keemia Abad, Moushumi Sarma, Marcelo I. Guzman, Jesse G. Thompson, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Oxidative degradation in amine based post-combustion carbon capture (PCCC) leads to solvent losses and decreased solvent performance. Oxygen (O2) in the flue gas is dissolved into the aqueous solvent and can reactively degrade the amine component. Advanced aqueous amine solvents are designed to contain additional surfactant and anti-foam additives as well as two types of corrosion inhibitors. These additives contribute to improve the solvent performance while reducing foaming and corrosion of expensive equipment. This work examines the impact of these additives on oxygen solubility (or dissolved oxygen - DO) in various aqueous amines used in PCCC including ethanolamine (MEA), 1-amino-2-propanol (A2P), 2-amino-1-propanol (2A1P), 2-(methylamino)-ethanol (NMEA), 2-(ethylamine)-ethanol (2EAE), diethanolamine (DEA), methyl-diethanolamine (MDEA), dimethylethanolamine (DMEA), piperazine (PZ), 1,2-ethyldiamine (EDA), and 1,6 hexadiamine (HDA). The impact of carbon loading on oxygen solubility with and without these additives was also examined. The surfactant and anti-foam additives had minimal impact on DO for all the solvents investigated. The two anti-corrosion additives had opposite effects in the measured DO, 2- mercaptobenzothiazole (MBT) decreased the DO concentration, and sodium metavanadate showed an increase. These results indicate that several of these common additives can be expected to minimally affect DO related oxidative degradation in these advance amine solvents.

Original languageEnglish
Article number103646
JournalInternational Journal of Greenhouse Gas Control
Volume116
DOIs
StatePublished - May 2022

Bibliographical note

Funding Information:
The authors would like to thank the U.S. Department of Energy for primary financial support for this project (DE-FE0031660).

Publisher Copyright:
© 2022

Keywords

  • Additives
  • Amine solvent
  • Dissolved oxygen
  • Dissolved oxygen sensor
  • O solubility
  • Oxidative degradation

ASJC Scopus subject areas

  • Pollution
  • Energy (all)
  • Management, Monitoring, Policy and Law
  • Industrial and Manufacturing Engineering

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