US4051079A
Expired / Lapsed
US
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Regeneration of acidic cation exchange resin using acidified phenol-water mixture
Assignee: Chiyoda Corp
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Filing: 1976-06-22
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Granted: 1977-09-27
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Expires: 1996-06-22
Abstract
Abstract Acidic cation exchange resin whose activity has been reduced by fouling from phenolic tars and/or by contamination by metal ions, is regenerated by treating such resin with an acidified phenol/water wash.
Inventors
- 👤 Earl George Melby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:21
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01J31/10; B01J31/40; B01J31/4007; C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; B01J2231/00; B01J2231/30; B01J2231/34; B01J2231/341; B01J2231/347; B01J31/0201; B01J31/0202; B01J31/0215; B01J31/0225; C07C2601/00; C07C2601/12; C07C2601/14; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
Process for regenerating sulfonated acidic cation exchange resin that has been deactivated with phenol-derived organic tars or by contamination with metallic ions, or both, which process comprises passing a phenol-water mixture containing an acid having a pKa of less than about 3 through said resin, wherein the major component of said mixture is phenol.
Claim 2
Dependent Claim
54 words
Process for regenerating sulfonated acidic cation exchange resin that has been deactivated with phenol-derived organic tars or by contamination with metallic ions, or both, which process comprises passing a phenol-water mixture containing an acid having a pKa of less than about 3 through said resin, wherein the major component of said mixture is phenol.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the acid has a pKa of less than about 2.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the acid is an organic acid.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the acid is a sulfonic acid.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the sulfonic acid is benzenesulfonic acid or para-toluenesulfonic acid.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the resin is fouled with organic tars derived from a bisphenol-A process.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the resin is a macroreticular resin comprising the sulfonated product of a styrene/divinylbenzene copolymer.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the resin is fouled with organic tars derived from a phenol/carbonyl compound condensation process.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |