Ultrafast Semi-Solid Processing of Highly Durable ZIF-8 Membranes for Propylene/Propane Separation

Area of Science:

• Materials Science
• Chemical Engineering
• Separation Technology

Background:

• Zeolitic imidazolate framework-8 (ZIF-8) membranes show promise for C3H6/C3H8 separation due to precise molecular sieving.
• Scalable synthesis, reproducibility, durability, and cost remain challenges for industrial ZIF-8 membrane application.

Purpose of the Study:

• To develop a scalable, reproducible, and cost-effective method for fabricating ZIF-8 membranes.
• To evaluate the performance and stability of ZIF-8 membranes for C3H6/C3H8 separation.

Main Methods:

• A semi-solid process was employed for ultrafast, high-yield synthesis of ZIF-8 membranes.
• ZIF-8 membranes were prepared on commercial flat-sheet ceramic substrates.
• Dimethylacetamide (DMAC) entrapped ZIF-8 crystals were utilized to enhance adsorptive selectivity.

Main Results:

• The semi-solid process demonstrated outstanding scalability and reproducibility.
• The fabricated ZIF-8 membranes exhibited excellent C3H6/C3H8 separation performance across wide temperature and pressure ranges.
• Membranes maintained remarkable stability for over 6 months, with a 300 cm2 module demonstrating efficient separation.

Conclusions:

• The semi-solid process offers a viable route for scalable and reproducible ZIF-8 membrane fabrication.
• ZIF-8 membranes with DMAC entrapment provide enhanced adsorptive selectivity for C3H6/C3H8 separation.
• This advancement addresses key limitations, paving the way for industrial application in C3H6/C3H8 separation.