Patent US4591490A successfully refreshed from Google Patents.
US4591490A
Expired / Lapsed
US
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Removal of mercury from gases
Assignee: Phillips Petroleum Co
•
Filing: 1984-10-19
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Granted: 1986-05-27
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Expires: 2004-10-19
Abstract
Abstract Mercury is removed from a gas stream using anion exchange resins.
Inventors
- 👤 Robert L. Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:50
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/64; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
28 words
A method for removing mercury from a gas comprising contacting said gas with a basic anion exchange resin where said resin has been treated with a polysulfide solution.
Claim 2
Independent Claim
28 words
A method for removing mercury from a gas comprising contacting said gas with a basic anion exchange resin where said resin has been treated with a polysulfide solution.
Claim 3
Dependent Claim
21 words
A method according to claim 1 where said anion exchange resin has an HCl uptake capacity of 2.3-2.5 milli-equivalents per gram.
Claim 4
Dependent Claim
27 words
A method according to claim 1 where said anion exchange resin is a cross-linked copolymer of styrene and divinylbenzene onto which quaternary ammonium groups have been incorporated.
Claim 5
Dependent Claim
14 words
A method according to claim 1 where said polysulfide solution is a (pseudo-) tetrasulfide.
Claim 6
Dependent Claim
12 words
A method according to claim 1 where said gas is natural gas.
Claim 7
Dependent Claim
14 words
A method according to claim 1 further comprising regenerating said treated anion exchange resin.
Claim 8
Dependent Claim
21 words
A method according to claim 6 where said treated anion exchange resin is regenerated by contacting said resin with polysulfide solution.
Claim 9
Dependent Claim
15 words
A method according to claim 7 where said polysulfide solution is a (pseudo-) tetrasulfide solution.
Claim 10
Dependent Claim
22 words
A method according to claim 8 where said (pseudo-) tetrasulfide solution has a molar concentration ranging from about 0.5 to about 2.
Claim 11
Dependent Claim
22 words
A method according to claim 6 where said treated anion exchange resin is regenerated by contacting said resin with dilute nitric acid.
Claim 12
Dependent Claim
21 words
A method according to claim 1 where said polysulfide solution has a molar concentration ranging from about 0.5 to about 2.
Claim 13
Dependent Claim
31 words
A method according to claim 1 where said polysulfide solution is present in an amount ranging from about 0.1 to about 30 weight percent, based on the weight of said resin.
References Cited (Backward Citations)
US3183185A
Cited
US3085859A
Cited
US3661509A
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US3617563A
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US3790535A
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US4044098A
Cited
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 |