Abrasion-proof filtration membrane and method of producing said membrane
AssigneeMN Beteiligungs GmbH
InventorsGisela Jung, Andreas Bareth, Ulrich Meyer-Blumenroth
Life of this patent
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Abstract
A filtration membrane (1) is provided that includes a porous support (4) and a membrane layer having a first and a second zone (2, 3). The first zone (2) has a thickness of 5 to 15 μm and an average pore opening size of smaller/equal 0.4 and the second zone (3) has a thickness of 5 to 40 μm and an average pore opening size of 0.5 to 5.0 μm. The filtration membrane (1) is produced by forming a single- or -double-layer coating on the porous support (4).
Claims18
A filtration membrane comprising a porous support, a membrane surface for receiving feed, and a membrane layer with a first and second zone, wherein the first zone has a thickness of 5 to 15 μm and a mean pore size of less than or equal to 0.4 μm and the second zone has a thickness of 5 to 40 μm and a mean pore size of 0.4 to 5.0 μm and wherein, said support is a textile nonwoven, wherein the filtration membrane has a clean water permeability of 200 to 2000 L/(m2·h·bar).
A flat filtration membrane comprising a nonwoven porous support and a membrane layer with a first and second zone and a membrane surface for receiving feed;
- wherein the first zone is placed next to said membrane surface and said second zone is placed between said first zone on one side and said nonwoven porous support on the side opposite said first zone such that said nonwoven porous support is placed away from said membrane surface;
- and
- wherein in the first zone, the mean pore size increases with a mean gradient of 20 to 80 nm per 1 μm distance from said membrane surface and in the second zone, the mean pore size increases with increasing distance from said membrane surface;
- and
- wherein the first zone has a thickness of 5 to 15 μm and a mean pore size of less than or equal to 0.4 μm and the second zone has a thickness of 5 to 40 μm and a mean pore size of 0.4 to 5.0 μm;
- and
- wherein the first zone and the second zone are comprised of polysulfone and polyvinylpyrrolidone, and the filtration membrane has a clean water permeability of 200 to 3000 L/(m2·h·bar).
Dependencies are inferred from the claim text.