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US-2015360170-A1 · Dec 17, 2015 · US
Carbon molecular sieve membranes made from 6FDA and DETDA-based precursor polymers
US9527045B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9527045-B2 |
| Application number | US-201414581167-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 23, 2014 |
| Priority date | Dec 26, 2013 |
| Publication date | Dec 27, 2016 |
| Grant date | Dec 27, 2016 |
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Abstract
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A carbon molecular sieve (CMS) membrane is made by pyrolyzing a film or hollow fiber membrane made of a polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units. At least 50% of the dianhydride-derived units are derived from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane (6FDA). At least 50% of the diamine-derived units are derived from 2,5-diethyl-6-methyl-1,3-diamino benzene (DETDA).
First claim
Opening claim text (preview).
What is claimed is: 1. A method for producing a carbon molecular sieve (CMS) membrane, comprising the steps of forming films or hollow fibers made of a polyimide polymer or copolymer to produce a precursor membrane, and pyrolyzing the precursor membrane under conditions sufficient to form a CMS membrane, wherein: the polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units; each dianhydride-derived unit being the dianhydride-derived moiety of formula (I): at least 50% but not all of the diamine-derived units are the diamine-derived moiety of formula (A) with the balance of the diamine-derived units being the diamine-derived moiety of formula (H): each R a is a —COOH group; X 1 and X 3 are ethyl groups; X 2 is a methyl group; X 4 is H. 2. The CMS membrane made according to the method of claim 1 .
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Classifications
Ageing features · CPC title
characterised by specific membranes · CPC title
Specific ratios of components used · CPC title
Nonporous membranes · CPC title
by carbonisation or pyrolysis · CPC title
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- What does patent US9527045B2 cover?
- A carbon molecular sieve (CMS) membrane is made by pyrolyzing a film or hollow fiber membrane made of a polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units. At least 50% of the dianhydride-derived units are derived from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane (6FDA). At least 50% of the diamine-derived units are …
- Who is the assignee on this patent?
- L'Air Liquide Soc Anonyme Pour L'Etude Et Expl Des Procedes Georges Claude, Georgia Tech Res Inst, L'Air Liquide Société Anonyme Pour L'Étude Et L'Exploitation Des Procedes Georges Claude
- What technology area does this patent fall under?
- Primary CPC classification B01D71/021. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 27 2016 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).