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US4276187A
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Oxidation-reduction reagents for a wet desulfurization process and a process for preparing same
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1979-04-04
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Granted: 1981-06-30
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Expires: 1999-04-04
Abstract
Abstract An oxidation-reducing reagent for a wet desulfurization process, which comprises (a) one or more compounds selected from the group consisting of salts of substituted anthraquinonesulfonic acids of the general formulas: <IMAGE> (I) and <IMAGE> (II) wherein M stands for a sodium atom, a potassium atom or an ammonium group, and n is an integer of 1 or 2, or (b) a mixture of a salt of anthraquinone-2,7-disulfonic acid and one or more compounds shown by the general formula (I) and/or (II), as well as a process for preparing the compounds of the general formulas (I) and (II).
Inventors
- 👤 Katsuya Sakai
- 👤 Ryuichi Mita
- 👤 Toshio Kato
- 👤 Chojiro Higuchi
- 👤 Hisamichi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:06
CPC Classifications
C; C07; C07D; C07D417/00; C07D417/02; C07D417/12; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; C07D401/00; C07D401/02; C07D401/12; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/128
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A composition containing an oxidation-reduction reagent for a wet desulfurization process, which comprises: (a) an alkaline aqueous solution of at least about 0.1% of one or more compounds selected from the group consisting of salts of substituted anthraquinonesulfonic acids of the general formulae ##STR13## wherein M stands for a sodium atom, a potassium atom or an ammonium group and n is an integer of 1 or 2; (b) sodium metavanadate of 1/1000-1/20 mol per liter of said aqueous solution; and (c) a sufficient amount of sodium carbonate to make the pH value of said aqueous solution range from 8.5 to 9.5.
Claim 2
Dependent Claim
101 words
A composition containing an oxidation-reduction reagent for a wet desulfurization process, which comprises: (a) an alkaline aqueous solution of at least about 0.1% of one or more compounds selected from the group consisting of salts of substituted anthraquinonesulfonic acids of the general formulae ##STR13## wherein M stands for a sodium atom, a potassium atom or an ammonium group and n is an integer of 1 or 2; (b) sodium metavanadate of 1/1000-1/20 mol per liter of said aqueous solution; and (c) a sufficient amount of sodium carbonate to make the pH value of said aqueous solution range from 8.5 to 9.5.
Claim 3
Dependent Claim
18 words
The composition as in claim 1 wherein said oxidation-reduction reagent is sodium, potassium or ammonium 2-carboxy-anthraquinone-6 or 7-sulfate.
Claim 4
Dependent Claim
15 words
The composition as in claim 1 wherein said wet desulfurization process is the "Stretford process".
Claim 5
Dependent Claim
32 words
The composition as in claim 1, wherein said oxidation-reduction reagent comprises (a) at least one compounds selected from the group consisting of salts of substituted anthraquinone-sulfonic acids of the general formulae ##STR14##
References Cited (Backward Citations)
US1917421A
Cited
US3089879A
Cited
US3280154A
Cited
CS149998B1
Cited
CS150000B1
Cited
CS149721B1
Cited
US3933917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |