Poly(ionic liquid)s for Selective Carbon Capture

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King Saud University, Saudi Arabia

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Presentation transcript:

Poly(ionic liquid)s for Selective Carbon Capture Peter Styring Professor of Chemical Engineering & Chemistry Chemical & Biological Engineering The University of Sheffield

CCS/CCU Process C-1 chemistry C-12 / C-18 T, p Storage CO2 Air pipeline CO2 Air Catalytic Reactor N2 EWP CO2 Municipal waste C-1 chemistry CO2 Capture H2 power water heat C-12 / C-18

Capture Current state of the Art is aqueous solutions of monoethanolamine (MEA) at concentrations of 15-30% (w/w) MEA has problems of toxicity, corrosion, reactive chemistry and evaporative loss Strong interaction between CO2 and basic NH2 group Mixture of physi- and chemisorption Energy requirement for desorption makes the process energy intensive Over 70% of the absorber is occupied by water which has implication on capital expenditure Need materials that show selective physisorption

Possible Adsorbents

Poly(ether) absobents O. Aschenbrenner & P. Styring, Energy Environ. Sci. 2010, 3, 1106 Poly(ether) absobents

CO2 / N2 Solubility Substance Solubility of CO2 (mmol/l) Solubility of N2 (mmol/l) Glycerol 391 333 Glycerol carbonate 251 220 Tetraglyme 111 52 PEGDME 150 158 91 PEG 200 343 359 PEG 300 344 189 PEG 600 197 190 Poly(ethylenimine) >71 233 Methanol 138 7 Water 34 1 Comparative molar solubilities of carbon dioxide and nitrogen at 25 °C for the pure gases in the test adsorbents under identical conditions

Desorption from PEG150

Ionic liquid & Poly(Ionic liquid) absobents O. Aschenbrenner, S. Supatitmongkol, M. Taylor & P. Styring, Green Chem. 2009, 11, 1217 Ionic liquid & Poly(Ionic liquid) absobents

Isothermal thermogrammes for [C2mim][ES] at 120 and 220 °C after an initial in situ drying procedure

Vapour Pressure Calibration by TGA

Vapour Pressures of Ionic liquids by TGA Detectable vapour pressures, higher than expected: e.g. [C2mim][ES] Vp = 2.0 Pa at 120 ⁰C Is it the IL vapour, impurities or decomposition products? TGA-MS analysis showed some evidence of IL Headspace MS at 100 & 200 ⁰C showed conclusive evidence.

Head Space MS [C2mim][ES]

CO2 Adsorption Capacity by TGA S. Supasitmongkol & P. Styring, Energy Environ. Sci. 2010, 3, 1961-1972

Selectivity (TGA)

Bench Scale Absorber

Bench Scale Absorption

Bench Scale Selectivity

[C2mim][ES] by TGA

PIL by TGA

[C2mim][ES]

ILm & PIL

Release Lower energy than amines IL monomer shows slow release (blue) PIL (red) releases CO2 rapidly Reduces materials requirements Negligible evaporative loss for PIL Relatively low material and operating costs (Design Projects)

Acknowledgements Dr Ortrud Aschenbrenner Somsak Supasitmongkol Dr Marie Taylor Nicole Tan Dr Jamil Khan Dr Francis Clegg (SHU) Simon Thorpe Royal Thai Government and National Metal and Materials Technology Center (MTEC) EPSRC “C-Cycle Consortium” (EP/E010318/1)

Carbon Capture and Utilisation in the green economy Using CO2 to manufacture fuel, chemicals and materials Authors Peter Styring (The University of Sheffield), Daan Jansen (ECN) Co-authors Heleen de Coninck (ECN), Hans Reith (ECN), Katy Armstrong (The University of Sheffield)

www.co2chem.com