Monolayer, composite, gas separation material, filter, gas separation device and method for manufacturing composite
US-12128366-B2 · Oct 29, 2024 · US
Hollow fiber filtration membrane
US2017304780A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017304780-A1 |
| Application number | US-201515523513-A |
| Country | US |
| Kind code | A1 |
| Filing date | Nov 4, 2015 |
| Priority date | Nov 4, 2014 |
| Publication date | Oct 26, 2017 |
| Grant date | — |
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- Title
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Abstract
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A hollow fiber filtration membrane in which even when a relatively small contaminant having a size close to that of a permeation effective component is present in a filtration solution, Flux decrease over time during filtration is suppressed, and a useful component can be efficiently recovered, the hollow fiber filtration membrane including a polysulfone-based polymer and a hydrophilic polymer and having a large number of pores, the hollow fiber filtration membrane having a gradient asymmetric porous structure in which an average pore diameter of the pores increases from an outer surface portion toward an inner surface portion of the membrane, a content of the hydrophilic polymer of the membrane being from 6.0 to 10.0% by mass, a ratio between a content of the hydrophilic polymer at the inner surface portion and the content of the hydrophilic polymer of the membrane being in the range of from 0.50 to 0.80.
First claim
Opening claim text (preview).
1 . A hollow fiber filtration membrane comprising a polysulfone-based polymer and a hydrophilic polymer and having a large number of pores, wherein the hollow fiber filtration membrane has a gradient asymmetric porous structure in which an average pore diameter of the pores increases from an outer surface portion toward an inner surface portion of the membrane, a content of the hydrophilic polymer of the membrane is from 6.0 to 10.0% by mass, and a ratio between a content of the hydrophilic polymer at the inner surface portion and the content of the hydrophilic polymer of the membrane is in the range of from 0.50 to 0.80. 2 . The hollow fiber filtration membrane according to claim 1 , wherein a content of the hydrophilic polymer at the outer surface portion is higher than the content of the hydrophilic polymer of the membrane. 3 . The hollow fiber filtration membrane according to claim 1 , wherein the hollow fiber filtration membrane has a pure water permeation rate of from 80 to 240 L/(hr·m 2 ·bar). 4 . The hollow fiber filtration membrane according to claim 1 , wherein the hollow fiber filtration membrane has a dense layer having a thickness of from 2 to 10 μm. 5 . The hollow fiber filtration membrane according to claim 1 , wherein the polysulfone-based polymer is polyethersulfone. 6 . The hollow fiber filtration membrane according to claim 1 , wherein the hydrophilic polymer is a copolymer comprising a vinylpyrrolidone unit.
Assignees
Inventors
Classifications
Specific pressure applied · CPC title
Hollow fibre membranes (manufacture of hollow fibres D01D5/24, D01F1/08) · CPC title
Drying · CPC title
characterised by their properties · CPC title
from other polycondensation products · CPC title
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- What does patent US2017304780A1 cover?
- A hollow fiber filtration membrane in which even when a relatively small contaminant having a size close to that of a permeation effective component is present in a filtration solution, Flux decrease over time during filtration is suppressed, and a useful component can be efficiently recovered, the hollow fiber filtration membrane including a polysulfone-based polymer and a hydrophilic polymer …
- Who is the assignee on this patent?
- Asahi Kasei Medical Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B01D71/68. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Oct 26 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).