Journal
RSC ADVANCES
Volume 3, Issue 37, Pages 16264-16269Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra42256a
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Funding
- National Natural Science Foundation of China [21076101, 21176110]
- Jiangsu Province Industrial Extension Foundation [BE2010142]
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Six acid salt ionic liquids (ASILs), triethylbutylammonium dicarboxylates, have been synthesized to act as green materials for SO2 capture. The experimental results reveal that the ASILs can trap SO2 reversibly and chemically with a large capacity of 0.112 up to 0.232 (mass ratio) at 15.5 kPa and of 0.374 to 0.456 (mass ratio) at 100 kPa and 40 degrees C. Two of these ASILs are interestingly found to have a low viscosity that enables the fast mass transfer of SO2. A reaction mechanism is proposed to explain the chemical absorption based on FTIR spectra and structural calculations using the density functional theory. Thermodynamic analysis indicates the enthalpy of the reaction of SO2 with the ASILs is low (-29.9 and -42.2 kJ mol(-1) for [N-2224][dimaleate] and [N-2224][dimalonate], respectively). Additionally, the ASILs have a high thermal stability, which favors their potential application in flue gas desulfurization.
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