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Solvent Development for CO 2 Capture. Ugochukwu E. Aronu and Hallvard F. Svendsen Norwegian University of Science and Technology (NTNU) Trondheim, NORWAY. J, 2008 U. Outline. Research Plan Overview CO2 Capture Amine Solvent Review Structure – pKa Relationship VLE Experiment Summary.

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J, 2008 U

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  1. Solvent Development for CO2 Capture Ugochukwu E. Aronu and Hallvard F. Svendsen Norwegian University of Science and Technology (NTNU) Trondheim, NORWAY J, 2008 U

  2. Outline • Research Plan Overview • CO2 Capture Amine Solvent Review • Structure – pKa Relationship • VLE Experiment • Summary

  3. Research Plan Overview • Review of CO2 capture solvents -Properties of an ideal solvent -Suggested/Future amine solvents • Screening Tests - Amine systems will be screened for absorption capacity and absorption rate • VLE Experiments -VLE experiment on selected system -Thermodynamic model of VLE results • Kinetics Experiments - Rate determination - Kinetics model • Physicochemical Properties Determination -pKa, Solubility, Viscousity, Activity Coefficient, Density • Simulations-HSYS

  4. Objective Objective of this project is to develop solvent(s) that will be able to meet considerably the present and/or future requirements of an ideal solvent for carbon dioxde capture. Some of the key requirements of the solvent(s) include: • High absorption capacity • High absorption rate • Low regeneration energy • Chemically stable • Non-corrosive • Cheap • Environmentally friendly

  5. CO2 Capture Solvents Review • Ideal Solvent Properties of Interest Here we look at the desired properties of an ideal solvent and how such property is related to CO2 capture process - Dissociation Constant (pKa) - Heat of reaction - Solubility - Molecular weight - Degradation - Corrosion - Foaming - Vapour Pressure - Reaction Kinetics - Cost - Toxicity/Environmental properties • Solvent Collection • Commercial Solvent • Single Solvent • Blended Solvent

  6. Commercial Amine Processes & Solvents

  7. Some Single Amine Solvents

  8. Structure - pKa RelationshipChain Length Effect

  9. Structure - pKa relationshipMultifunctional Amine Group Effect

  10. Structure - pKa relationshipAlkyl Group Effect

  11. Structure - pKa RelationshipHydroxyl Group Effect-Primary Alkanolamine

  12. VLE Apparatus

  13. VLE Test Result

  14. Summary • Several amines solvents have been suggested for CO2 Capture • It appears there is relationship between amines structures and their pKa value • Effort is to explain this relationship using electron donation and withdrawal through bonds and solvation effect • To know the benefit that could be derived from this relationship in CO2 capture process, particularly in solvent selection • VLE Experiments continues

  15. Thank You

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