US3744642A
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Interface condensation desalination membranes
Assignee: Katalistiks International Inc
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Filing: 1970-12-30
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Granted: 1973-07-10
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Expires: 1990-12-30
Abstract
Abstract A desalination membrane-substrate composite, effective to permit the effusion of pure water and the rejection of dissolved impurities, comprising a semipermeable membrane layer of polymeric material in contact with at least one side of a porous substrate is made by in-situ interfacial condensation of two fast reacting organic compounds in the presence of a porous substrate.
Inventors
- 👤 D Ciliberti
- 👤 L Scala
- 👤 D Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:44
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D71/00; B01D71/06; B01D71/48; B01D71/56
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
54 words
contacting said first deposit with a solution of a second organic compound dissolved in a second solvent, said solvents being relatively immiscible in each other, said first organic compound being reactive with said second organic compound, to form a desalination membrane layer of polymeric material in-situ on the substrate by an interfacial condensation reaction.
Claim 2
Dependent Claim
21 words
The composite of claim 1 wherein the polymeric material has a uniform cross-section and comprises polymer chains having minute interstices therebetween.
Claim 3
Dependent Claim
47 words
The composite of claim 2 wherein the porous substrate comprises fibers, at least one side of which is in contact with the membrane layer, the membrane layer extends into said substrate pores, and the interstices between the membrane polymer chains are up to about 150 A diameter.
Claim 4
Dependent Claim
69 words
The composite of claim 2 wherein the membrane is formed on the substrate by in-situ interfacial condensation of a disulfonyl halide compound selected from the group consisting of aliphatic disulfonyl halides and carbocyclic disulfonyl halides and an amine compound selected from the group consisting of aliphatic primary diamines, aliphatic secondary diamines, carbocyclic primary diamines, aliphatic primary triamines, aliphatic secondary triamines and carbocyclic primary triamines, to provide a polysulfonamide membrane.
Claim 5
Dependent Claim
45 words
The composite of claim 2 wherein the membrane is formed on the substrate by in-situ interfacial condensation of a bisphenol compound and an acyl halide compound selected from the group consisting of aliphatic diacyl halides and carbocyclic diacyl halides, to provide a polyphenyl ester membrane.
Claim 6
Dependent Claim
69 words
The composite of claim 2 wherein the membrane is formed on the substrate by in-situ interfacial condensation of an acyl halide compound selected from the group consisting of aliphatic diacyl halides and carbocyclic diacyl halides with an amine compound selected from the group consisting of aliphatic primary diamines, aliphatic secondary diamines, carbocyclic primary diamines, aliphatic primary triamines, aliphatic secondary triamines and carbocyclic primary triamines, to provide a polyamide membrane.
Claim 7
Dependent Claim
30 words
The composite of claim 6, wherein the membrane layer is formed by in-situ interfacial condensation of an acyl halide selected from the group consisting of diacyl halides having the formula
Claim 8
Dependent Claim
13 words
The composite of claim 2 supported by a resin bonded particulate sand support.
Claim 9
Independent Claim
14 words
A method of making an interface condensation desalination membrane-substrate composite comprising the steps of:
Claim 10
Dependent Claim
33 words
The method of claim 9 wherein the first solvent is soluble in the second solvent up to about 1 wt. percent and the substrate has pores between about 0.03 to 8 microns diameter.
Claim 11
Dependent Claim
64 words
The method of claim 9, wherein one organic compound is a disulfonyl halide selected from the group consisting of aliphatic disulfonyl halides and carbocyclic disulfonyl halides and the other organic compound is an amine selected from the group consisting of aliphatic primary diamines, aliphatic secondary diamines, carbocyclic primary diamines, aliphatic primary triamines, aliphatic secondary triamines and carbocyclic primary triamines, to provide a polysulfonamide membrane.
Claim 12
Dependent Claim
41 words
The method of claim 9, wherein one organic compound is a bisphenol compound and the other organic compound is a diacyl halide selected from the group consisting of aliphatic diacyl halides and carbocyclic diacyl halides to provide a polyphenyl ester membrane.
Claim 13
Dependent Claim
64 words
The method of claim 9 wherein one organic compound is an amine selected from the group consisting of aliphatic primary diamines, aliphatic secondary diamines, carbocyclic primary diamines aliphatic primary triamines, aliphatic secondary triamines and carbocyclic primary triamines and the other organic compound is an acyl halide selected from the group consisting of aliphatic diacyl halides and carbocyclic diacyl halides, to provide a polyamide membrane.
Claim 14
Dependent Claim
19 words
The method of claim 13, wherein the amine is selected from the group consisting of diamines having the formula
Claim 15
Dependent Claim
33 words
The method of claim 14, wherein the solvent for the amine is water and the mole ratio of amine to acyl halide in the interfacial condensation reaction is between about 2:1 to 20:1.
Claim 16
Dependent Claim
27 words
The method of claim 15, wherein the solvent for the acyl halide is selected from the group consisting of trichloroethylene, cyclohexane, benzene, xylene, carbon tetrachloride and chloroform.
Claim 17
Dependent Claim
38 words
The method of claim 16, wherein the substrate is continuously passed through the diamine solution and the acyl halide solution, the substrate is dried between steps (1) and (2) and the membrane-substrate composite is washed after step (2).
Claim 18
Dependent Claim
36 words
The method of claim 16, wherein the concentration of the amine in solvent is between about 0.1 to 1.0 molar and the concentration of the acyl halide in solvent is between about 0.005 to 0.5 molar.
Claim 19
Dependent Claim
22 words
The method of claim 16, wherein the first organic compound is the amine and the second organic compound is the acyl halide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |