Absorption of CO2 from natural gas using different amino acid salt solutions and regeneration using hollow fiber membrane contactors

Nihmiya Abdul Rahim, Nayef Ghasem, Mohamed Al-Marzouqi

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Natural gas consists primarily of methane but it also contains considerable amounts of contaminating compounds mainly carbon dioxide (CO2). In the present work, the absorption/Stripping performance of four different amino acid salt (AAS) aqueous solutions was compared with MEA and NaOH solutions by using homemade PVDF hollow fiber gas-liquid membrane contactor modules. Compared to MEA, AAS have enhanced CO2 absorption/stripping performance. The experimental results show that the absorption performance can be enhanced by increasing liquid flow rate. However, the gas flow rate has negative effect on the removal efficiency although flux increases. Furthermore, it has been observed that AAS shows negligible effect of temperature on absorption performance. To improve the stripping performance, enhanced CO2 desorption (based on pH-shift) was studied by using asymmetric solutions of AAS. Higher molar ratios of amino acid shows better stripping and reduced absorption performance because lower pH shifts the CO2 reaction equilibrium towards the release of CO2. Also it has been observed AAS solutions have lower potential of membrane wetting due to its high surface tension. Further it has been proved AAS solutions have good recyclability.

Original languageEnglish
Pages (from-to)108-117
Number of pages10
JournalJournal of Natural Gas Science and Engineering
Volume26
DOIs
Publication statusPublished - Sep 1 2015

Keywords

  • Amino acid salts
  • CO absorption/stripping
  • Flux
  • Membrane contactors
  • Removal efficiency

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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