Composite semipermeable membrane
US-2015014244-A1 · Jan 15, 2015 · US
Composite semipermeable membrane
US9827536B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9827536-B2 |
| Application number | US-201314429934-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 19, 2013 |
| Priority date | Sep 26, 2012 |
| Publication date | Nov 28, 2017 |
| Grant date | Nov 28, 2017 |
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Abstract
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Provided is a composite semipermeable membrane having a high salt removal rate and a high water permeability. The composite semipermeable membrane comprises a substrate, a porous support layer formed on the substrate, and a separation functional layer formed on the porous support layer, the hydrophilic macromolecule concentration on the substrate-side surface of the porous support layer being higher than that on the separation functional layer-side surface.
First claim
Opening claim text (preview).
The invention claimed is: 1. A composite semipermeable membrane comprising a substrate, a porous support layer formed on the substrate, and a separation functional layer formed on the porous support layer, the porous support layer being provided with a substrate-side surface and a separation function layer-side surface, the porous support layer having a higher concentration of hydrophilic macromolecules on the substrate-side surface than that on the separation functional layer-side surface. 2. The composite semipermeable membrane according to claim 1 , wherein the porous support layer is formed by applying a macromolecular solution A containing hydrophilic macromolecules for forming a first layer onto the substrate, at the same time applying a macromolecular solution B not containing hydrophilic macromolecules for forming a second layer, and subsequently bringing the substrate into contact with a coagulating bath for phase separation. 3. The composite semipermeable membrane according to claim 2 , wherein the hydrophilic macromolecule is polyvinylpyrrolidone or a copolymer containing polyvinylpyrrolidone as a hydrophilic site. 4. The composite semipermeable membrane according to any of claims 1 to 3 , wherein the separation functional layer contains cross-linked polyamide of 50% by weight or more. 5. The composite semipermeable membrane according to any of claims 1 to 3 , wherein the substrate is a filament non-woven fabric containing polyester of 50% by weight or more.
Assignees
Inventors
Classifications
by reverse osmosis · CPC title
by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125) · CPC title
- B01D71/56Primary
Polyamides, e.g. polyester-amides · CPC title
Seawater, e.g. for desalination · CPC title
Polysulfones; Polyethersulfones · CPC title
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- What does patent US9827536B2 cover?
- Provided is a composite semipermeable membrane having a high salt removal rate and a high water permeability. The composite semipermeable membrane comprises a substrate, a porous support layer formed on the substrate, and a separation functional layer formed on the porous support layer, the hydrophilic macromolecule concentration on the substrate-side surface of the porous support layer being h…
- Who is the assignee on this patent?
- Toray Industries
- What technology area does this patent fall under?
- Primary CPC classification B01D71/56. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 28 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).