Facile method for determination of amine speciation in CO 2 capture solutions

Naser S. Matin, Joseph E. Remias, James K. Neathery, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

A simple and quantitatively reliable method for determination of amine speciation is introduced. The method employs three experimental methods that should be readily accessible. The results for CO 2 loaded aqueous solutions of 30 wt % monoethanolamine (MEA) are used for demonstration of the method and show promising agreement with the more complicated spectroscopic methods reported in the literature. The measurements were done at ambient temperature and atmospheric pressure, since theoretical calculations and experimental data from the open literature revealed no considerable difference in speciation at different temperatures. The procedure is based on acid and base titration of the CO 2 loaded amine solution along with the determination of total CO 2 loading. The quantitative results for the different species concentration in the example MEA solution is in agreement with other available spectroscopic methods, mainly NMR, particularly for the free amine, carbamate, and protonated amine concentrations. Aspen Plus was also used for further assessment of the experimental data.

Original languageEnglish
Pages (from-to)6613-6618
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume51
Issue number19
DOIs
StatePublished - May 16 2012

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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