US4747955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of liquids with treated polyester fibers
Assignee: Marmon Industrial Water LLC
•
Filing: 1987-04-13
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Granted: 1988-05-31
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Expires: 2007-04-13
Abstract
Abstract A method for removing impurities from a liquid utilizing a filter bed having polyester fibers which have been treated with a hot caustic solution to increase the hydrophilicity of the polyester fibers. The caustic solution preferably contains a surfactant to increase the initial wetting of the polyester fibers.
Inventors
- 👤 Robert Kunin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:43
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; B; B01; B01D; B01D39/00; B01D39/02; B01D39/04; B01J; B01J47/00; B01J47/12; B01J47/133; C02F1/285
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
43 words
A method for removing impurities from a liquid comprising: passing said liquid through a filter bed comprising a mixture of oppositely charged polyester fibers, wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Claim 2
Independent Claim
43 words
A method for removing impurities from a liquid comprising: passing said liquid through a filter bed comprising a mixture of oppositely charged polyester fibers, wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Claim 3
Dependent Claim
19 words
The method as defined in claim 1 wherein said caustic solution is a 2% to 4% sodium hydroxide solution.
Claim 4
Dependent Claim
22 words
The method as defined in claim 2 wherein said polyester fibers are treated with said caustic solution for at least one hour.
Claim 5
Dependent Claim
27 words
The method as defined in claim 1 wherein the temperature of said caustic solution is above 90° F. and below the softening temperature of said polyester fibers.
Claim 6
Dependent Claim
22 words
The method as defined in claim 1 wherein the caustic solution contains a surfactant to increase the wetting of said polyester fibers.
Claim 7
Dependent Claim
16 words
The method as defined in claim 5 wherein said surfactant is a low foaming nonionic surfactant.
Claim 8
Dependent Claim
20 words
The method as defined in claim 1 wherein said polyester fibers have been rinsed after treatment with said caustic solution.
Claim 9
Dependent Claim
81 words
The method as defined in claim 1 wherein 5% to 95% of said polyester fibers having been treated in aqueous suspension with a cationic polyelectrolyte to produce a positive surface charge bonding to the surface of said polyester fibers and wherein the remainder of said polyester fibers having been treated in aqueous suspension with a cationic polyelectrolyte and then with an anionic polyelectrolyte to produce a negative surface charge by bonding to said polyester fibers previously treated with said cationic polyelectrolyte.
Claim 10
Dependent Claim
23 words
The method as defined in claim 8 wherein said caustic treatment of said polyester fibers precedes said polyelectrolyte treatment of said polyester fibers.
Claim 11
Independent Claim
65 words
A method for removing impurities from a liquid comprising: passing said liquid through a filter bed comprising a mixture of ion exchange resin particles and treated polyester fibers, said ion exchange resin particles and said treated polyester fibers having opposite surface charges in aqueous suspension, and wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Claim 12
Independent Claim
65 words
A method for removing impurities from a liquid comprising: passing said liquid through a filter bed comprising a mixture of ion exchange resin particles and treated polyester fibers, said ion exchange resin particles and said treated polyester fibers having opposite surface charges in aqueous suspension, and wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Claim 13
Dependent Claim
19 words
The method as defined in claim 10 wherein said caustic solution is a 2% to 4% sodium hydroxide solution.
Claim 14
Dependent Claim
22 words
The method as defined in claim 11 wherein said polyester fibers are treated with said caustic solution for at least one hour.
Claim 15
Dependent Claim
27 words
The method as defined in claim 10 wherein the temperature of said caustic solution is above 90° F. and below the softening temperature of said polyester fibers.
Claim 16
Dependent Claim
22 words
The method as defined in claim 10 wherein said caustic solution contains a surfactant to increase the wetting of said polyester fibers.
Claim 17
Dependent Claim
16 words
The method as defined in claim 14 wherein said surfactant is a low foaming nonionic surfactant.
Claim 18
Dependent Claim
20 words
The method as defined in claim 10 wherein said polyester fibers have been rinsed after treatment with said caustic solution.
Claim 19
Dependent Claim
27 words
The method as defined in claim 10 wherein said polyester fibers having been treated with a cationic polyelectrolyte to produce a positive surface charge by bonding thereon.
Claim 20
Dependent Claim
31 words
The method as defined in claim 10 wherein said polyester fibers are present in an amount from 20% to about 80%, based on the weight of said ion exchange resin particles.
Claim 21
Dependent Claim
18 words
The method as defined in claim 18 wherein said ion exchange resin particles comprise cation exchange resin particles.
Claim 22
Dependent Claim
18 words
The method as defined in claim 18 wherein said ion exchange resin particles comprise anion exchange resin particles.
Claim 23
Dependent Claim
26 words
The method as defined in claim 18 wherein said ion exchange resin particles comprise a mixture of cation exchange resin particles and anion exchange resin particles.
Claim 24
Dependent Claim
33 words
The method as defined in claim 21 wherein said polyester fibers, said cation exchange resin particles and said anion exchange resin particles are present in approximately equal amounts based on the weight thereof.
Claim 25
Dependent Claim
38 words
The method as defined in claim 21 wherein approximately 10% to 20% of the cation exchange resin particles and the anion exchange resin particles have been ball milled to a particle size of approximately 10 to 30 microns.
Claim 26
Independent Claim
64 words
A method for removing impurities from a liquid comprising: passing said liquid through a filter bed comprising a mixture of an active particulate material and treated polyester fibers, said active particulate material and said treated polyester fibers having opposite surface charges in aqueous suspension, and wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Claim 27
Independent Claim
64 words
A method for removing impurities from a liquid comprising: passing said liquid through a filter bed comprising a mixture of an active particulate material and treated polyester fibers, said active particulate material and said treated polyester fibers having opposite surface charges in aqueous suspension, and wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Claim 28
Dependent Claim
19 words
The method as defined in claim 24 wherein said caustic solution is a 2% to 4% sodium hydroxide solution.
Claim 29
Dependent Claim
22 words
The method as defined in claim 25 wherein said polyester fibers are treated with said caustic solution for at least one hour.
Claim 30
Dependent Claim
27 words
The method as defined in claim 24 wherein the temperature of said caustic solution is above 90° F. and below the softening temperature of said polyester fibers.
Claim 31
Dependent Claim
22 words
The method as defined in claim 27 wherein said caustic solution contains a surfactant to increase the wetting of said polyester fibers.
Claim 32
Dependent Claim
27 words
The method as defined in claim 24 wherein said polyester fibers having been treated with a cationic polyelectrolyte to produce a positive surface charge by bonding thereon.
Claim 33
Dependent Claim
32 words
The method as defined in claim 24 wherein said active particulate material is selected from the group consisting of zeolites, bentonite, zirconium oxide, zirconium phosphate, iron sulfide, activated carbon, and diatomaceous earth.
References Cited (Backward Citations)
US4238334A
Cited
US4664812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |