Precipitating non-aqueous amine systems for absorption of carbon dioxide using 2-amino-2-methyl-1-propanol

Research output: Contribution to journalArticle

Abstract

The aim of this study was to find a solvent to replace N-methyl-2-pyrrolidone (NMP) in CO2 absorption systems containing the amine 2-amino-2-methyl-1-propanol (AMP), in order to reduce the health risks associated with handling, as NMP is reproductively toxic. Seven organic solvents were investigated: dimethyl sulfoxide (DMSO), 3-(dimethylamino)propionitrile (3DMAPN), 1-pentanol (1 P), propylene carbonate (PC), 4-heptanone (4 H), 1-methylimidazole (1MIMI) and cyclohexanol (CH). Henry's constant, the CO2 solubility and the differential heat of absorption were determined for the pure solvents, and in solvent mixtures containing 25 wt% AMP, at 25 °C and 40 °C. Three of the solvents were found to have promising absorption properties: DMSO, 3DMAPN and 1 P. In mixtures with AMP, precipitation was formed at both 25 and 40 °C, and the CO2 absorption capacity was similar to that in the AMP–NMP system, in terms of the CO2 loading for a given partial pressure of CO2. The results also indicated that the reaction of AMP and CO2 in these solvents can be described by the zwitterion reaction mechanism.

Details

Authors
Organisations
External organisations
  • RWTH Aachen University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Organic Chemistry

Keywords

  • AMP, Bi-phasic, CO capture, Heat of absorption, Non-aqueous, Precipitating, Solubility
Original languageEnglish
Pages (from-to)460-468
Number of pages9
JournalInternational Journal of Greenhouse Gas Control
Volume88
Publication statusE-pub ahead of print - 2019 Sep
Publication categoryResearch
Peer-reviewedYes