US4162299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of sulfur oxides
Assignee: Toray Engineering Co Ltd
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Filing: 1978-01-04
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Granted: 1979-07-24
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Expires: 1998-01-04
Abstract
Abstract Sulfur oxides are removed from waste gases containing the same by scrubbing the waste gas with an aqueous scrubbing solution containing the aluminate of sodium, potassium or ammonium and an additional compound selected from the group consisting of aluminum sulfate and alum.
Inventors
- 👤 Tetsu Takeyama
- 👤 Akio Takahashi
- 👤 Kiichiro Matsumura
- 👤 Keiya Kitagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:43
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A process for removing sulfur oxides from a waste gas containing said sulfur oxides, comprising contacting said gas with an aqueous scrubbing solution containing aluminate and at least one additional compound selected from the group consisting of aluminum sulfate and alum and having a pH of from 2 to 4.5, the concentration of said additional compound in the scrubbing solution being within the range of from 1 to 30% by weight.
Claim 2
Dependent Claim
71 words
A process for removing sulfur oxides from a waste gas containing said sulfur oxides, comprising contacting said gas with an aqueous scrubbing solution containing aluminate and at least one additional compound selected from the group consisting of aluminum sulfate and alum and having a pH of from 2 to 4.5, the concentration of said additional compound in the scrubbing solution being within the range of from 1 to 30% by weight.
Claim 3
Dependent Claim
26 words
The process as claimed in claim 1, wherein said aluminate is selected from the group consisting of sodium, potassium and ammonium aluminate and any mixture thereof.
Claim 4
Dependent Claim
143 words
A process for removing sulfur oxides from a waste gas containing said sulfur oxides comprising the steps of: (a) contacting said gas with a circulating aqueous scrubbing solution containing aluminate and at least one additional compound selected from the group consisting of aluminum sulfate and alum, and having a pH of from 2 to 4.5, in an absorption column, the concentration of said additional compound in the scrubbing solution being within the range of from 1 to 30% by weight, whereby said sulfur oxides contained in the gas are absorbed into said scrubbing solution; (b) oxidizing at least a portion of the scrubbing solution by contacting the solution with air, oxygen or a gas containing oxygen, and; (c) withdrawing a portion of the oxidized scrubbing solution from the system and returning the remainder of the oxidized scrubbing solution to the circulating scrubbing solution.
Claim 5
Dependent Claim
143 words
A process for removing sulfur oxides from a waste gas containing said sulfur oxides comprising the steps of: (a) contacting said gas with a circulating aqueous scrubbing solution containing aluminate and at least one additional compound selected from the group consisting of aluminum sulfate and alum, and having a pH of from 2 to 4.5, in an absorption column, the concentration of said additional compound in the scrubbing solution being within the range of from 1 to 30% by weight, whereby said sulfur oxides contained in the gas are absorbed into said scrubbing solution; (b) oxidizing at least a portion of the scrubbing solution by contacting the solution with air, oxygen or a gas containing oxygen, and; (c) withdrawing a portion of the oxidized scrubbing solution from the system and returning the remainder of the oxidized scrubbing solution to the circulating scrubbing solution.
Claim 6
Dependent Claim
26 words
The process as claimed in claim 3, wherein said aluminate is selected from the group consisting of sodium, potassium and ammonium aluminate and any mixture thereof.
References Cited (Backward Citations)
US2434868A
Cited
US3943230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |