Application of rejection enhancing agents (REAs) that do not have cloud point limitations on desalination membranes
US-9216385-B2 · Dec 22, 2015 · US
Composite polyamide membrane including dissolvable polymer coating
US9533262B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9533262-B2 |
| Application number | US-201414758575-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 28, 2014 |
| Priority date | Mar 14, 2013 |
| Publication date | Jan 3, 2017 |
| Grant date | Jan 3, 2017 |
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- Title
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Abstract
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A thin film composite membrane including a thin film polyamide layer positioned between a porous support and an outer coating, and a humectant; wherein the membrane has an A-value of at least 8 l/m 2 hr/bar when tested at 25 l/m 2 hr with pure water at 25° C. for one hour, and wherein the outer coating comprises a dissolvable cellulose polymer provided at coverage of at least 10 mg/m 2 that substantially dissolves from the membrane after one hour of continuous cross-flow of water at 25 l/m 2 hr and 25° C.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of preserving a thin film composite hyperfiltration membrane in a dry state wherein the membrane comprises a thin film polyamide layer having a thickness of from 0.01 to 0.1 μm and comprising a reaction product of m-phenylene diamine (mPD) and trimesoyl chloride (TMC) positioned between a porous support, wherein the method comprises the steps of: i) adding a humectant to the membrane, ii) coating the thin film polyamide layer of the membrane with a dissolvable cellulose polymer provided at coverage of at least 10 mg/m 2 which, after drying, would substantially dissolve from the membrane after one hour of continuous soaking in water at 25° C., iii) and drying the membrane so that its water content less than 5 g/m 2 . 2. The method of claim 1 wherein the cellulose polymer is carboxymethyl cellulose.
Assignees
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Classifications
Cellulose derivatives · CPC title
- B01D67/0088Primary
Physical treatment with compounds, e.g. swelling, coating or impregnation · CPC title
Impregnation · CPC title
Degradation or stability over time · CPC title
Drying · CPC title
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- What does patent US9533262B2 cover?
- A thin film composite membrane including a thin film polyamide layer positioned between a porous support and an outer coating, and a humectant; wherein the membrane has an A-value of at least 8 l/m 2 hr/bar when tested at 25 l/m 2 hr with pure water at 25° C. for one hour, and wherein the outer coating comprises a dissolvable cellulose polymer provided at coverage of at least 10 mg/m 2 that …
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- What technology area does this patent fall under?
- Primary CPC classification B01D67/0088. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Jan 03 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).