US4591439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange process and apparatus
Assignee: EIDP Inc
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Filing: 1985-08-13
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Granted: 1986-05-27
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Expires: 2005-08-13
Abstract
Abstract A device and process are disclosed for continuously removing cations from an aqueous solution by means of two compartment ion exchanger wherein one compartment cation exchange membrane material serves to separate the compartments and particulate cation exchange material serves as a cation absorber in the compartment opposite the cations to be removed.
Inventors
- 👤 Walther G. Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:16
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/12; B01J39/00; B01J39/04; B01J49/00; B01J49/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A nonelectrolytic cation exchange device having at least two compartments separated by a cation exchange membrane, at least a first one of the compartments being substantially filled with a particulate cation exchange resin and at least a second one of the compartments being substantially free from particulate cation exchange resin, means for continuously passing an ion-containing solution into and through the first compartment and means for continuously passing a regenerant solution into and through the second compartment.
Claim 2
Dependent Claim
77 words
A nonelectrolytic cation exchange device having at least two compartments separated by a cation exchange membrane, at least a first one of the compartments being substantially filled with a particulate cation exchange resin and at least a second one of the compartments being substantially free from particulate cation exchange resin, means for continuously passing an ion-containing solution into and through the first compartment and means for continuously passing a regenerant solution into and through the second compartment.
Claim 3
Dependent Claim
17 words
A cation exchange device of claim 1 wherein the cation exchange membrane is a sulfonated fluoropolymer derivative.
Claim 4
Dependent Claim
17 words
A cation exchange device of claim 1 wherein the cation exchange resin is a sulfonated crosslinked polystyrene.
Claim 5
Dependent Claim
92 words
A nonelectrolytic process for continuously removing cations from an aqueous solution by continuously passing an aqueous cation solution into and through a cation exchange device having at least two compartments separated by cation exchange membrane, at least a first one of the compartments being substantially filled with a granular cation exchange resin and at least a second one of the compartments being substantially free from particulate cation exchange resin, the aqueous solution being passed into and through the first compartment, and continuously passing a regenerant solution into and through the second compartment.
Claim 6
Dependent Claim
92 words
A nonelectrolytic process for continuously removing cations from an aqueous solution by continuously passing an aqueous cation solution into and through a cation exchange device having at least two compartments separated by cation exchange membrane, at least a first one of the compartments being substantially filled with a granular cation exchange resin and at least a second one of the compartments being substantially free from particulate cation exchange resin, the aqueous solution being passed into and through the first compartment, and continuously passing a regenerant solution into and through the second compartment.
Claim 7
Dependent Claim
14 words
A process of claim 4 wherein the regenerant solution consists essentially of sulfuric acid.
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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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |