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Amine Grafted Adsorbents for Efficient CO 2 Capture

Amine Grafted Adsorbents for Efficient CO 2 Capture. Dr Joe Wood School of Chemical Engineering University of Birmingham, UK. Midlands Energy Consortium International Showcase 5 th October 2011. Overview. Step-change Adsorbents For Carbon Capture

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Amine Grafted Adsorbents for Efficient CO 2 Capture

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  1. Amine Grafted Adsorbents for Efficient CO2 Capture Dr Joe Wood School of Chemical Engineering University of Birmingham, UK Midlands Energy Consortium International Showcase 5th October 2011

  2. Overview • Step-change Adsorbents For Carbon Capture • Nottingham, Birmingham, UCL, Liverpool. Sponsors EPSRC & E.ON • Post-combustion capture • Hydrotalcite clays • Amine grafting • TGA studies of CO2 uptake • Next Generation of Activated Carbon Adsorbents for the Pre-Combustion Capture of CO2 UK-China CCS Call • Nottingham, Birmingham, UCL, Warwick, Tsinghua Universities, Chinese Inst. Coal Chemistry. UK Sponsor EPSRC • Pre-combustion capture • CO2 breakthrough curves • gProms modelling

  3. Post-Combustion Technology Hydrotalcite solid adsorbent Absorption in to liquid amines Moving bed adsorption schematic

  4. Step Change Adsorbents for Carbon Dioxide Capture • Aim: To develop advanced adsorbents capable of capturing > 3 mmol/g CO2 • Adsorbents should also have desirable kinetics, stability and ability to be regenerated Proposed operating conditions for capture plant based on a temperature swing adsorption process (Drage et al, J. Materials Chem 2011).

  5. Hydrotalcite Clays • Hydroxycarbonate of Mg and Al • Brucite (Mg(OH)2) layers • Mg2+ ions substituted by other metals • (CO3)2- ions in the interlayer

  6. Improved exfoliation method Mg2+ or Al3+ OH NH2 Adding certain amount of water (eg. 0.3ml/g) Si 90oC,24h Toluene US Dodecyl sulfate Brucite like layer Harlick, P. and Sayari, A. Ind. Eng. Chem. Res. 2007, 46, 446-458.

  7. Different Types of Aminosilanes • (3-Aminopropyl)triethoxysilane (N1) • N-(2-Aminoethyl-3-aminopropyl) trimethoxysilane (N2) • N-3-(Trimethoxysilyl)propyl) diethylenetriamine (N3)

  8. CO2 Adsorption by TGA Switch from N2 to CO2 CO2 adsorbed

  9. Samples Prepared With Water –CO2 adsorption at 80 oC

  10. Next Generation of Activated Carbon Adsorbents for Pre-Combustion CO2 capture

  11. Experimental Work

  12. Experimental Work Cycle 1 adjusted by 20% and cycle 2 by 10% Zeolite X adsorbent

  13. Modelling and Simulation • Equations • Component Mass Balance • Adsorption rate equation • Approximated Langmuir equation • Assumptions • Ideal gas law; Pressure drop by Darcy’s equation; Isothermal operation; Bed in thermal equilibrium; No variation in radial direction

  14. Modelling and Simulation Decreasing Bed Length

  15. Acknowledgements • EPSRC and E.ON • Dr Jiawei Wang • Dr Trevor Drage, Prof. Colin Snape and STEPCAP project partners • Simon Caldwell, Dr Bushra Al-Duri

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