Abstract
This research introduces zeolite carbon composite (ZCC) as a new filler on polymeric membranes based on the BTDA-TDI/MDI (P84) co-polyimide for the air separation process. The separation performance was further improved by a polydimethylsiloxane (PDMS) coating to cover up the surface defect. The incorporation of 1 wt% ZCC into P84 co-polyimide matrix enhanced the O2 permeability from 7.12 to 18.90 Barrer (2.65 times) and the O2/N2 selectivity from 4.11 to 4.92 Barrer (19.71% improvement). The PDMS coating on the membrane further improved the O2/N2 selectivity by up to 60%. The results showed that the incorporation of ZCC and PDMS coating onto the P84 co-polyimide membrane was able to increase the overall air separation performance.
Highlights
The development of gas separation by membrane technology has increased rapidly in the last two decades
They are polymers with good thermal properties (Tg~300 ◦ C). They are low cost, have high mechanical properties, and can be modified to different configurations. These polymers belong to a family of precursors that are optimal for the preparation of carbon molecular sieve membranes [2,10]
As other polymeric membranes, this membrane suffers from the trade-off between selectivity and permeability, known as “upper-bound”, as proposed by Robeson, who stated that “the gas separation properties of the polymeric membranes follow distinct trade-off relations, where more selective membranes are generally less permeable and vice versa” [11,12,13]
Summary
The development of gas separation by membrane technology has increased rapidly in the last two decades. Polymeric membranes are the most used materials for gas separation membranes They have some limitations, such as poor thermal and low chemical resistance [2]. They are polymers with good thermal properties (Tg~300 ◦ C) They are low cost, have high mechanical properties, and can be modified to different configurations (flat, hollow fiber, and supported membranes). These polymers belong to a family of precursors that are optimal for the preparation of carbon molecular sieve membranes [2,10]. As other polymeric membranes, this membrane suffers from the trade-off between selectivity and permeability, known as “upper-bound”, as proposed by Robeson, who stated that “the gas separation properties of the polymeric membranes follow distinct trade-off relations, where more selective membranes are generally less permeable and vice versa” [11,12,13]
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