EP0181850A1
Expired / Lapsed
EP
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Composite fluid separation membranes
Assignee: Monsanto Co
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Filing: 1985-08-12
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Granted: —
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Expires: 2005-08-12
Abstract
Abstract Membranes which have a non-porous intermediate layer (8) between a separating layer (2) and a porous support (4) are taught wherein the in situ-formed non-porous intermediate layer (8) positioned between a porous support (4) and an in s i tu-formed separating layer (2), results in composite fluid separation membranes having improved permeability for the separation of fluids. The highly permeable intermediate layer (8) provides spacing between the separating layer (2) and the porous support (4) which creates a funnel effect (12, 14) for the fluid from the separating layer (2) to the pores (6) of the porous substrate (4).
Inventors
- 👤 Menahem Alfred Kraus
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 14:01
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/1216; B01D53/00; B01D53/22; B01D53/228; B01D69/06; B01D69/08; B01D69/10; B01D2325/00; B01D2325/02; B01D2325/04; B01D2325/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A composite fluid separation membrane comprising: (a) a porous support having pores extending there through; (b) an in situ-formed intermediate non-porous layer which is in contact with the porous support on the first side; (c) an in situ-formed separating layer in contact with a second side of the non-porous intermediate layer, the intermediate layer having a determined intrinsic separation factor for one fluid relative to at least one other fluid of the mixture fluid which is less than the determined intrinsic separation factor of the material of the separating layer for the one fluid, wherein the composite porous support has an effective mean pore size which is greater than the actual pore size of the porous support, and the composite fluid separation membrane has a greater permeability for the one fluid than the permeability for the one fluid of a composite fluid separation membrane comprised of the porous support and the separating layer.
Claim 2
Dependent Claim
153 words
A composite fluid separation membrane comprising: (a) a porous support having pores extending there through; (b) an in situ-formed intermediate non-porous layer which is in contact with the porous support on the first side; (c) an in situ-formed separating layer in contact with a second side of the non-porous intermediate layer, the intermediate layer having a determined intrinsic separation factor for one fluid relative to at least one other fluid of the mixture fluid which is less than the determined intrinsic separation factor of the material of the separating layer for the one fluid, wherein the composite porous support has an effective mean pore size which is greater than the actual pore size of the porous support, and the composite fluid separation membrane has a greater permeability for the one fluid than the permeability for the one fluid of a composite fluid separation membrane comprised of the porous support and the separating layer.
Claim 3
Dependent Claim
29 words
A composite fluid separation membrane according to Claim 1 wherein the square of the effective pore size increases as a function of the square of the intermediate layer thickness.
Claim 4
Dependent Claim
57 words
A composite gas separation membrane according to Claim 1 wherein the gas is selected from the group consisting of carbon monoxide, nitrogen, argon, methane, ethane, carbon dioxide, hydrogen sulfide, acid gases, and hydrogen, the effective separating thickness of the composite gas separation membrane varies from about 200 x 10- 10 to about 15,000 x 10 -10 meters.
Claim 5
Dependent Claim
26 words
A composite fluid separation membrane according to Claim 3 wherein the effective pore size increases as a function of the square of the intermediate layer thickness.
Claim 6
Dependent Claim
44 words
The composite gas separation membrane of Claim 3 in which the ratio of the separation factors for the one gas of the in situ-formed intermediate non-porous layer relative to the in situ-formed separating layer is within the range of about 0.01 to about 0.8.
Claim 7
Dependent Claim
43 words
The composite gas separation membrane of Claim 3 in which the permeability exhibited by the composite gas separation membrane is at least about 25% greater than the permeability of a composite gas separation membrane comprised of the porous support and the separating layer.
Claim 8
Dependent Claim
50 words
The composite gas separation membrane of Claim 6 in which, with respect to at least one gas of a pair of gases of the gaseous mixture, the material of the in situ-formed intermediate non-porous layer has a higher permeability constant than does the material of the in situ-formed separating layer.
Claim 9
Dependent Claim
27 words
The composite gas separation membrane of Claim 3 in which the porous support first side surface area is comprised of from about 2 to about 50% pores.
Claim 10
Dependent Claim
16 words
The composite gas separation membrane of Claim 3 in which the composite membrane is a film.
Claim 11
Dependent Claim
17 words
The composite gas separation membrane of Claim 2 in which the composite membrane is a hollow fiber.
Claim 12
Dependent Claim
34 words
The composite gas separation membrane of Claim 3 wherein the in situ-formed intermediate non-porous layer has an average dimensional thickness of at least twice that of the average dimensional thickness of the separating layer.
Claim 13
Dependent Claim
57 words
The composite gas separation membrane of Claim 3 wherein the composite gas separation membrane has an additional in situ-formed non-porous layer of the material of the intermediate layer or a different polymeric material layer having permeability for the one gas substantially greater than the permeability of the separating layer and deposited on top of the separating layer.
Claim 14
Dependent Claim
33 words
The composite gas separation membrane of Claim 3 wherein the intermediate non-porous layer has an average dimensional thickness which is equal to or greater than the average pore size of the porous support.
References Cited (Backward Citations)
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