Impact of flue gas contaminants on monoethanolamine thermal degradation

Quanzhen Huang, Jesse Thompson, Saloni Bhatnagar, Payal Chandan, Joseph E. Remias, John P. Selegue, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The buildup of flue gas contaminants in amine-based postcombustion CO 2 capture processes is an important concern due to its potential impact on solvent degradation and reclaiming. In this research, in order to explore the impact of flue gas contaminants on solvent thermal degradation, sodium nitrite, fly ash, sodium sulfate, and sodium thiosulfate were each added into carbon-loaded 5.0 M monoethanolamine (MEA) solution and the solutions were exposed to high-temperature degradation conditions. MEA degrades significantly more in the presence of nitrite (5000 ppm) than MEA alone at the same amine mole concentration. The MEA degradation activation energy of MEA-nitrite solution is calculated and found to be approximately one-seventh of that of MEA solution without nitrite. Addition of nitrite not only enhanced generation of several MEA thermal degradation products but also induced formation of diethanolamine (DEA) and N-(2-hydroxyethyl)piperazin-3-one (HEPO), which have been known to form during MEA oxidative degradation. Interestingly, fly ash was observed to inhibit nitrite-induced MEA degradation and greatly increase the MEA degradation activation energy of MEA-nitrite solution. This led to a reduction in accumulation of several degradation products. Fly ash, sodium sulfate, and sodium thiosulfate by themselves were not shown to impact MEA thermal degradation rate.

Original languageEnglish
Pages (from-to)553-563
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Volume53
Issue number2
DOIs
StatePublished - Jan 15 2014

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Industrial and Manufacturing Engineering

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