US3956112A
Expired / Lapsed
US
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Membrane solvent extraction
Assignee: Honeywell International Inc
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Filing: 1975-03-13
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Granted: 1976-05-11
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Expires: 1995-03-13
Abstract
Abstract A membrane solvent extraction system is utilized to separate two substantially immiscible liquids and extract a solute through a solvent swollen membrane from one solvent liquid phase to the extracting solvent liquid without direct contact between the liquid phases. The membrane extraction method has advantages over conventional solvent extraction and may be applied as the mechanism in separation, purification, pollutant removal and recovery processes.
Inventors
- 👤 Lester T. C. Lee
- 👤 Win-Sow Ho
- 👤 Kang-Jen Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/246; B01D61/2461; B01D11/00; B01D11/04; B01D11/0415; C; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B21/00; C01B21/20; C01B21/38; C01B21/46; C01B25/00; C01B25/16; C01B25/46; C01B25/461; C01B25/462; C01B7/00; C01B7/01; C01B7/07; C01B7/0706; C01B7/0731; C01B7/0737; C01B7/09; C01B7/096; C01B7/19; C01B7/191; C01B7/195
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
153 words
A solvent extraction process which comprises the steps of contacting one side of a polymeric substantially non-porous membrane with a first solvent liquid B containing a solute material A and contacting the other side of said membrane with an extracting second solvent liquid C which is substantially immiscible with liquid B, said membrane being swollen by the respective solvents thereby forming an intermediary zone and allowing the diffusion through the swollen membrane of the solute material A while preventing direct phase to phase contact between solvent liquids B and C, and wherein the diffusivity of A in the membrane from B and C is in the range of about 1 × 10.sup. -9 to about 1 × 10.sup. -4 cm 2 /sec., and maintaning the separation of liquids B and C by said membrane until said solute A has been substantially extracted from liquid B through a solvent swollen membrane into liquid C.
Claim 2
Dependent Claim
153 words
A solvent extraction process which comprises the steps of contacting one side of a polymeric substantially non-porous membrane with a first solvent liquid B containing a solute material A and contacting the other side of said membrane with an extracting second solvent liquid C which is substantially immiscible with liquid B, said membrane being swollen by the respective solvents thereby forming an intermediary zone and allowing the diffusion through the swollen membrane of the solute material A while preventing direct phase to phase contact between solvent liquids B and C, and wherein the diffusivity of A in the membrane from B and C is in the range of about 1 × 10.sup. -9 to about 1 × 10.sup. -4 cm 2 /sec., and maintaning the separation of liquids B and C by said membrane until said solute A has been substantially extracted from liquid B through a solvent swollen membrane into liquid C.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein liquid B is inorganic and liquid C is organic.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein liquid B is acid.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein liquid B is basic.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said liquid B contains a plurality of solutes.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein said membrane is a composite non-porous solvent swollen membrane.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein the extraction of the solute is effected at a temperature of from about the freezing point of the solutions to about 200°C.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said membrane has a solvent content of from about 10 to about 95%.
Claim 10
Dependent Claim
26 words
The process of claim 1 wherein said membrane is a hollow fiber with O.D. 40 μm to 500 μm and I.D. 30 μm to 490 μm.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein A is ε-caprolactam; B is water and C is chloroform.
Claim 12
Dependent Claim
16 words
The process of claim 1 wherein A is dichloroethane; B is water and C is n-heptane.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein A is dinitrotoluene; B is water and C is toluene.
Claim 14
Dependent Claim
16 words
The process of claim 1 wherein A is ε-caprolactam; B is water and C is tetrachloroethane.
Claim 15
Dependent Claim
17 words
The process of claim 1 wherein A is ε-caprolactam; B is aqueous sulfuric and C is chloroform.
Claim 16
Dependent Claim
18 words
The process of claim 1 wherein A is ε-caprolactam; B is aqueous sulfuric acid and C is tetrachloroethane.
Claim 17
Dependent Claim
17 words
The process of claim 1 wherein A is toluene diamine; B is water and C is dinitrotoluene.
Claim 18
Dependent Claim
16 words
The process of claim 1 wherein A is phenol; B is water and C is toluene.
Claim 19
Dependent Claim
30 words
The process of claim 1 wherein A is phenol; B is water and C is a long chain amine having a carbon chain of from 4 to 30 carbon atoms.
Claim 20
Dependent Claim
31 words
The process of claim 1 wherein A is phenol; B is water and C is a solution of a long chain amine having from 4 to 30 carbon atoms in toluene.
Claim 21
Dependent Claim
16 words
The process of claim 1 wherein A is toluene; B is water and C is n-alkane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |