US 12,138,599 B2
Porous polybenzimidazole membrane supports for composite membranes
David Philip Hopkinson, Morgantown, WV (US); and Lingxiang Zhu, Bethel Park, PA (US)
Assigned to Battelle Memorial Institute, Columbus, OH (US)
Filed by Battelle Memorial Institute, Columbus, OH (US)
Filed on Jul. 16, 2021, as Appl. No. 17/378,632.
Prior Publication US 2023/0024915 A1, Jan. 26, 2023
Int. Cl. B01D 53/22 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/62 (2006.01)
CPC B01D 71/62 (2013.01) [B01D 53/228 (2013.01); B01D 67/0013 (2013.01); B01D 67/0016 (2013.01); B01D 67/0095 (2013.01); B01D 69/02 (2013.01); B01D 69/105 (2013.01); B01D 69/122 (2013.01); B01D 2325/025 (2013.01); B01D 2325/04 (2013.01); B01D 2325/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A porous PBI membrane, comprising:
a fabric layer;
a PBI layer bonded to the fabric layer;
and further characterizable by:
wherein the PBI layer comprises a pore size of less than 50 nm, and a surface porosity of at least 8%; or
wherein the PBI layer comprises finger-like pores observed from the cross-section under microscope, and wherein at least 50 vol % of the pores in the PBI layer have an aspect ratio of at least 2, wherein aspect ratio is defined as maximum length divided by average diameter of each pore, and where length is perpendicular to the surface of the fabric layer.