interfacial polymerization...
TRANSCRIPT
Demonstration ofInterfacial Polymerization
Demonstrated by Dr. Bill Mickols
Compiled by Wei Xie & Hua Li
Presented by Benny Freeman Research Group
The University of Texas at Austin
Feb. 2010
Protocol 2
• 2. Mount polysulfone support on a frame.
Protocol 2: Mount polysulfone support on a frame
Protocol 3
• 3. Immerse in 3.0% MPD for over 1 hour.
Protocol 4
• 4. Place a piece of paper towel on the PMMA plate. Place the MPD imbibed polysulfone support on top. Roll water soaked rubber roller over top to remove water droplets.
Protocol 4:Roll rubber roller over top to remove water droplets
Protocol 5
• 5. Place 1/4 inch thick silicone sheet with hole cut in on the support membrane and the PMMA frame on top. Clamp with strong clamps.
Protocol 5:Place silicone gasket and frame on top
Protocol 6
• 6. Pour 75 ml of 5 mM TMC (in dry dodecane) over the surface. Let react for 1 min.
Protocol 6: react with TMC-dodecane solution
Protocol 7
• 7. Pour excess off. Disassemble frame. Mount back on PMMA frame.Rinse the surface with 75 ml of hexane. Allow to evaporate for 1 min.
Protocol 7:Disassemble frame and rinse with hexane
Protocol 8
• 8. Place in water until testing.
Dye test on IP membranes
Rejection: 98.7%, Flux: 35.8 LMH Rejection: 78.4%, Flux: 45.9 LMH
Experimental conditions: cross-flow filtration, pressure = 225 psig, feed = 2000ppm NaCl water solution, feed flow rate = 0.5 gpm.
ATTENTION!!! – Expert’s alarm!
• 1) MPD has a reasonable vapor pressure. Never breath the fumes and use it in a hood.
• 2) TMC does not have a vapor pressure but it readily degrades to TMA and HCL GAS. Opening a sealed bottle will give off HCL gas and could cause lung damage if you breathed a large quantity.
• 3) Hexane is very volatile, so no flames or sparks.
• 4) Never handle the surface of the polysulfone.
• 5) The pictures show a good example of the little bubbles. These are due to the nipping (rubber roller) operation. Clean up the drops of MPD behind the polysulfone. Then put a fresh paper towel between the sheet and the support to absorb the MPD drops.