Polymeric substrates and methods of making and using thereof

By creating PES substrates with highly interconnected pores through specific casting solutions and phase separation methods, the gas transport performance of composite membranes is enhanced, addressing the limitations of existing substrates in reducing mass and lateral diffusion resistances.

WO2025064987A1 Publication Date: 2025-03-27OHIO STATE INNOVATION FOUND
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Patent Information

Application Number
PCT/US2024/047959
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-22
Filing Date
2024-09-23
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

Existing composite membranes for gas separation, such as CO2 separation from flue gas, face challenges due to the limitations in the pore structure of the substrate layer, which affects the gas transport performance by increasing mass transfer resistance and lateral diffusion resistance.

Method used

The development of polyethersulfone (PES) substrates with highly interconnected pores, achieved through methods involving a casting solution with 3-methoxy propanol, N-methyl-2-pyrrolidone, lithium chloride, and polyvinylpyrrolidone, and phase separation techniques like vapor- and nonsolvent-induced phase separations, to enhance gas permeance.

Benefits of technology

The PES substrates with highly interconnected pores significantly reduce mass transfer and lateral diffusion resistances, resulting in improved CO2 permeance, with values ranging from 200,000 to 400,000 GPU at 57°C and 4 bar feed pressure, enhancing the overall gas separation performance of composite membranes.

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Abstract

Porous polymer membranes, methods of making porous polymer membranes, and methods of using the membranes are described herein. Generally, composite membranes used for gas separation include a dense top layer responsible for gas separation and a porous substrate layer that provides mechanical support. Although the major separation is achieved by the selective top layer, the pore structure of the substrate has a significant effect on the gas transport performance of the composite membrane
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