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Controlling the performance of silicalite-1 membranes
Gora1, Jansen, Maschmeyer
1Laboratory for Applied Organic Chemistry and Catalysis, DelftChemTech, Delft University of Technology, The Netherlands. L.Gora@tnw.tudelft.nl
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 29, 2000
Summary
Optimized silicalite membranes achieve high performance in separating n- and i-butane. Fine-tuning synthesis resulted in superior selectivity and flux, demonstrating excellent structural integrity for advanced membrane applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Separation Technology
Background:
- Silicalite membranes are crucial for gas separation.
- Optimizing their synthesis is key to enhancing performance.
Purpose of the Study:
- To optimize the synthesis of self-supported silicalite membranes for n- and i-butane separation.
- To investigate the relationship between synthesis parameters and membrane characteristics.
Main Methods:
- Screening nine silica sources and various reaction conditions.
- Utilizing mass balances to determine membrane thickness.
- Evaluating membrane performance through permselectivity and flux measurements.
Main Results:
- Membrane thickness was found to be dependent on synthesis volume and silica source.
- Achieved a permselectivity of 31 for n-butane with a flux of 10 mmol m(-2)s(-1).
- For 50/50 mixtures, selectivity reached 48 with a flux of 3.8 mmol m(-2)s(-1).
- Reported theoretical fluxes are the highest ever for the achieved selectivities, indicating superior functionality.
Conclusions:
- Fine-tuning synthesis is critical for optimizing silicalite membrane performance.
- High structural integrity is essential for achieving superior functionality in membrane separations.
- The developed membranes show exceptional promise for efficient n- and i-butane separation.