US4554076A
Expired / Lapsed
US
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Method of modifying membrane surface with oriented monolayers of amphiphilic compounds
Assignee: SPEAKER LOIS M
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Filing: 1982-08-18
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Granted: 1985-11-19
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Expires: 2002-08-18
Abstract
Abstract A method of improving the separatory properties of membranes by the deposition of a fluorinated amphiphilic compound in an oriented Langmuir-Blodgett layer on the membrane surface so as to increase membrane selectivity and counteract membrane surface properties leading to fouling during liquid-liquid separations and enhance gas selectivities of membranes used for gas-gas separations. The use of a fluorinated long-chain pyridinium bromide is specifically disclosed.
Inventors
- 👤 Lois M. Speaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:56
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D69/00; B01D69/12; B01D69/122; B05; B05D; B05D1/00; B05D1/18; B05D1/20; B05D1/202; B82; B82Y; B82Y30/00; B82Y40/00; C; C23; C23F; C23F15/00; C23F15/005
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
41 words
A method of modifying a surface of a separatory material comprising the step of depositing on said surface a layer of a fluorinated amphiphilic molecule which is oriented such that the fluorinated portion of said molecule extends outwardly from said surface.
Claim 2
Independent Claim
41 words
A method of modifying a surface of a separatory material comprising the step of depositing on said surface a layer of a fluorinated amphiphilic molecule which is oriented such that the fluorinated portion of said molecule extends outwardly from said surface.
Claim 3
Dependent Claim
16 words
A method as claimed in claim 1 wherein said molecule is a fluorinated aromatic heterocyclic bromide.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1 wherein said molecule is fluorinated pyridinium bromide.
Claim 5
Dependent Claim
15 words
A method as claimed in claim 1 wherein said layer is a monomolecular Langmuir-Blodgett layer.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 1 wherein said molecule is neutral in charge.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1 wherein said molecule has the same electrical charge as said membrane surface.
Claim 8
Dependent Claim
31 words
A method as claimed in claim 1 wherein said layer of said molecule is deposited on said surface at a deposition pressure ranging from 30 to 35 mN M -1 .
Claim 9
Dependent Claim
28 words
A method as claimed in claim 1 wherein said layer of said molecule is deposited on said surface at a deposition temperature ranging from 1° to 10° C.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 1 wherein the molecular weight of said molecule ranges from 350 to 700.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 1 wherein said molecule is water-insoluble at a deposition pressure ranging from 30 to 35 mN M -1 and a deposition temperature of 1° to 10° C.
Claim 12
Dependent Claim
15 words
A method as claimed in claim 1 wherein said separatory material is a semipermeable membrane.
Claim 13
Dependent Claim
15 words
A method as claimed in claim 11 wherein said membrane is a liquid-liquid separatory membrane.
Claim 14
Dependent Claim
15 words
A method as claimed in claim 11 wherein said membrane is a gas-gas separatory membrane.
Claim 15
Dependent Claim
15 words
A method as claimed in claim 1 wherein said separatory material is a resin particle.
Claim 16
Independent Claim
95 words
A method of treating the surfaces of semipermeable membranes which separates a component of a fluid, comprising the steps of: (a) placing a film of molecules of a fluorinated amphiphilic compound on the surface of a body of water; (b) compressing said film into an oriented monomolecular layer; and (c) moving said membrane vertically into and out of said film spread on a water surface a selected number of times whereby said monolayer is transferred onto an exterior surface of said membrane such that the fluorinated portion of said compound is directed toward said fluid.
Claim 17
Independent Claim
95 words
A method of treating the surfaces of semipermeable membranes which separates a component of a fluid, comprising the steps of: (a) placing a film of molecules of a fluorinated amphiphilic compound on the surface of a body of water; (b) compressing said film into an oriented monomolecular layer; and (c) moving said membrane vertically into and out of said film spread on a water surface a selected number of times whereby said monolayer is transferred onto an exterior surface of said membrane such that the fluorinated portion of said compound is directed toward said fluid.
Claim 18
Dependent Claim
14 words
A method as claimed in claim 15 wherein said compound is fluorinated pyridinium bromide.
Claim 19
Independent Claim
47 words
A method of enhancing the selectivity of a selective semipermeable membrane for a component of a mixture introduced to a surface of said membrane, comprising the step of depositing on said surface an oriented monolayer of a fluorinated amphiphilic compound which exhibits an affinity for said component.
Claim 20
Independent Claim
47 words
A method of enhancing the selectivity of a selective semipermeable membrane for a component of a mixture introduced to a surface of said membrane, comprising the step of depositing on said surface an oriented monolayer of a fluorinated amphiphilic compound which exhibits an affinity for said component.
Claim 21
Dependent Claim
12 words
A method as claimed in claim 17 wherein said compound is surface-active.
Claim 22
Independent Claim
34 words
A method of modifying the surface of a semipermeable membrane comprising the step of depositing on said surface an oriented monolayer of a fluorinated amphiphilic compound which has the same charge as said surface.
Claim 23
Independent Claim
34 words
A method of modifying the surface of a semipermeable membrane comprising the step of depositing on said surface an oriented monolayer of a fluorinated amphiphilic compound which has the same charge as said surface.
Claim 24
Dependent Claim
47 words
An improvement in a semipermeable membrane of the type having a surface in contact with a fluid to be separated, the improvement comprising a flourinated amphiphilic compound being deposited on said surface in an oriented monomolecular Langmuir-Blodgett layer so as to impart non-fouling characteristics to said membrane.
Claim 25
Dependent Claim
47 words
An improvement in a semipermeable membrane of the type having a surface in contact with a fluid to be separated, the improvement comprising a flourinated amphiphilic compound being deposited on said surface in an oriented monomolecular Langmuir-Blodgett layer so as to impart non-fouling characteristics to said membrane.
Claim 26
Dependent Claim
14 words
An improvement as claimed in claim 20 wherein said compound is fluorinated pyridinium bromide.
Claim 27
Dependent Claim
26 words
An improvement as claimed in claim 20 wherein said layer is oriented with the fluorinated portion of said compound directed toward said fluid to be separated.
Claim 28
Dependent Claim
17 words
An improvement as claimed in claim 20 wherein said layer is an x-layer of fluorinated pyridinium bromide.
Claim 29
Independent Claim
46 words
A method of preventing the fouling of a semipermeable membrane used for separating dissolved materials from liquids, comprising the step of depositing on the surface of said membrane an oriented monololecular layer of fluorinated pyridinium bromide prior to the use of said surface in said separating.
Claim 30
Independent Claim
46 words
A method of preventing the fouling of a semipermeable membrane used for separating dissolved materials from liquids, comprising the step of depositing on the surface of said membrane an oriented monololecular layer of fluorinated pyridinium bromide prior to the use of said surface in said separating.
Claim 31
Dependent Claim
44 words
An improvement in a semipermeable membrane of the type used for separating dissolved materials from liquids, the improvement comprising fluorinated pyridinium bromide being deposited in an oriented monomolecular layer on the surface of said membrane that is to be in contact with said liquid.
Claim 32
Dependent Claim
44 words
An improvement in a semipermeable membrane of the type used for separating dissolved materials from liquids, the improvement comprising fluorinated pyridinium bromide being deposited in an oriented monomolecular layer on the surface of said membrane that is to be in contact with said liquid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |