Novel Inverse Supported Ionic Liquid Absorbents for Acidic Gas Removal from Flue Gas

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• 作者：D. S. Karousos ; E. Kouvelos ; A. Sapalidis ; K. Pohako-Esko ; M. Bahlmann ; P. S. Schulz ; P. Wasserscheid ; E. Siranidi ; O. Vangeli ; P. Falaras ; N. Kanellopoulos ; G. Em. Romanos
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：55
• 期：19
• 页码：5748-5762
• 全文大小：884K
• 年卷期：0
• ISSN：1520-5045

文摘

This work reports on the astonishing high capacity of inverse supported ionic liquid absorbents, hereinafter denoted as “inverse SILPs” to remove acidic gases (SO₂ and CO₂) from flue gas streams. These nonconventional SILPs are easily prepared in the form of flowing powder via a phase inversion technique and consist of tiny ionic liquid (IL) droplets enclosed into an ultrathin, porous solid sleeve of pyrogenic silica nanoparticles. The CO₂/N₂ and SO₂/CO₂ separation performance and regeneration efficiency of inverse SILPs developed from six different ILs and two IL/chitosan ionogels was examined via gravimetric CO₂, N₂ absorption isotherms and via SO₂, CO₂, O₂ breakthrough curves from gas mixtures in fixed beds. The involved ILs varied from chemisorbing ones, composed of alkyl- or alkanol-ammonium cations and amino acid anions, to physisorbing ones including ether functionalized anions and 1-alkyl-3-methylimidazolium cations. It is noteworthy that the best performing inverse SILP consisted of a very common IL, the 1-butyl-3-methylimidazolium chloride [BMIM][Cl], the absorption capacity of which was slightly enhanced by dissolving 5 wt % of chitosan to form the respective ionogel. The material’s performance was stable in repeated cycles of absorption and regeneration at 60 °C under helium flow, exhibiting SO₂/CO₂ selectivity of above 300, while the SO₂ and CO₂ absorption capacity was 1.6 and 0.6 mmol/g respectively at 25 °C, in a gas stream of 1 bar composed of 0.13 vol % SO₂, 13 vol % CO₂, 11.5 vol % O₂ and N₂ (balance).