1 / 23

Transport of Small Molecules in Polymers: Overview of Research Activities

Transport of Small Molecules in Polymers: Overview of Research Activities. Benny D. Freeman Department of Chemical Engineering University of Texas at Austin, Office: CPE 3.404 and CEER 1.308B Tel.: (512)232-2803, e-mail: freeman@che.utexas.edu

terrypmartin
Download Presentation

Transport of Small Molecules in Polymers: Overview of Research Activities

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Transport of Small Molecules in Polymers: Overview of Research Activities Benny D. Freeman Department of Chemical Engineering University of Texas at Austin, Office: CPE 3.404 and CEER 1.308B Tel.: (512)232-2803, e-mail: freeman@che.utexas.edu http://www.che.utexas.edu/graduate_research/freeman.htm http://membrane.ces.utexas.edu 1

  2. Freeman Research Group Focus Develop fundamental structure/function rules to guide the preparation of high performance polymers or polymer-based materials for gas and liquid separations as well as barrier packaging applications.

  3. Freeman Research Group Profile • 15 Ph.D. students: • Gas Separations: Qiang Liu, Kevin Stevens, Grant Offord, Tom Murphy, Katrina Czenkusch, David Sanders, Zach Smith* • Liquid Separations: Wei Xie, Dan Miller*, Joe Cook, Geoff Geise, Michelle Oh, Albert Lee, Peach Kasemset* • Barrier Materials: Kevin Tung • 2 Postdocs: Dr. Claudio Ribeiro*, Dr. Chaoyi Ba • Sponsors: • NSF - 5 projects • DOE – 2 projects • Office of Naval Research - 1 project • Industrial sponsors: PSTC, Air Liquide, Kuraray, Kraton Polymers, ConocoPhillips, Statkraft, Dow Water Solutions * = group members who have won major fellowships to support their work from either the US govt. (NSF, DOE) or their home govt.

  4. Recent Graduates (within last 18 months)

  5. Current Projects - 1 • Gas Separations • Thermally-Rearranged Polymers for Gas Separation • CO2/CH4 Separation for Natural Gas Purification • Physical Aging in Glassy Polymers • Physical Aging in Microlayered Polymers • CO2/O2 Separation for Food Packaging Applications • Melt Processing Strategies to Prepare Thin Membranes for Gas Separations • Bioethanol Purification (Ethanol/Water Separation)

  6. Current Projects - 2 • Liquid Separations • Chlorine-Tolerant Desalination Membranes • Desalination Membranes Based on Novel Block Copolymers • Fundamental Studies of Ion and Water Transport in Polymers • Melt Processing Strategies to Prepare Desalination Membranes • Bio-inspired Surface Modification of Water Purification Membranes to Improve Fouling Resistance

  7. Current Projects - 3 • Others • Fundamental Studies of Oxygen Scavenging Polymers for High Oxygen Barrier Packaging • Hydrocarbon/Hydrocarbon Pervaporation for Refinery Separations

  8. Fouling: A Major Limitation in Liquid Filtration Membranes Feed flow External fouling 2000x decrease Internal fouling Membrane

  9. Mimicking Mussel Adhesion (“Bio-Glue”) H. Lee, S.M. Dellatore, W.M. Miller, and P.B. Messersmith., Mussel-Inspired Surface Chemistry for Multifunctional Coatings. Science, 318, 426-430 (2007).

  10. Polydopamine: Novel Fouling Resistant Membrane Coating Polydopamine

  11. Polydopamine as Surface “Primer” to Graft PEG to Membrane Surfaces Proposed Polydopamine Structure: PEG ad-layer Michael Addition/ Schiff Base Reaction Polydopamine

  12. Oily Water Filtration Using Pegylated Polydopamine Treated Teflon Microfiltration Membranes Modification: 60 min PDOPA deposition time followed by 60 min 5KDa PEG-NH2 (1mg/mL, 60 °C) Conditions: DP=0.3 atm, crossflow=120 L/h (Re=2500)1500 ppm soybean oil/DC193-water emulsion (non-ionic)

  13. Field Validation - Visual • Two identical UF PAN membranes that are highly hydrophilic • One coated and one non-coated, both processed high fouling water stream from a bio-reactor with a lot of sludge. • 10 minute filtration followed by 1 min backwash cycle for 48+ hours. • Both membranes were taken out and flushed with a hose / water • Modified membrane washes clean • Non-modified retains sludge film • Membrane housings (hydrophobic) also showed significantly better anti-stick, fouling resistant surface

  14. Field Validataion: Ultrafiltration of Bioreactor Effluent Unmodified Modified 2X More Water Processed Between Cleanings 40% Lower Energy • Pressure increases during single filtration/back-flush cycle due to fouling • Almost twice the volume of water could be processed for same end-point pressures • Unmodified shows pressure increase at a rate of 1.55 psi/hr vs. 1.1 psi/hr for modified membrane

  15. Natural Gas Processing • 100 trillion scf of natural gas used worldwide per year • All requires pretreatment • Amine absorption is the leading technology • Membranes have < 5% market share R.W. Baker, K. Lokhandwala, Natural gas processing with membranes: An overview, Industrial & Engineering Chemistry Research. 47 (2008) 2109-2121.

  16. Science, vol. 318, 12 October 2007, pp. 254-258.

  17. CO2/CH4 Separation Performance 1: PIOFG-1 2: TR-1-350 3: TR-1-400 4: TR-1-450 5-19: OTHER TR POLYMERS H.B. Park, C.H. Jung, Y.M. Lee, A.J. Hill, S.J. Pas, S.T. Mudie, E. van Wagner, B.D. Freeman, & D.J. Cookson, Polymers with Cavities Tuned for Fast, Selective Transport of Small Molecules and Ions, Science, 318, 254-258 (2007).

  18. Cavity Size Distribution from Positron Annihilation Lifetime Spectroscopy (a) PIOFG-1 (b) TR-1-350 (c) TR-1-400 (d) TR-1-450

  19. Beating the Permeability-Selectivity Tradeoff for H2 Purification Lin et al., Science, 311, pp. 639-642 (2006).

  20. Reduction to Practice 20

  21. CO2 Selective Materials

  22. Using Nanocomposites to Enhance Membrane Separations

  23. Using Nanolayering to Enhance Gas Barrier Properties

More Related