US4040803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet waste flue gas desulfurizing process using lime as absorbent
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1976-03-18
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Granted: 1977-08-09
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Expires: 1996-03-18
Abstract
Abstract A wet waste flue gas desulfurizing process using lime as absorbent, wherein a sulfur oxide-containing waste flue gas is washed with a liquid absorbent containing calcium hydroxide or calcium carbonate for the purpose of removing the sulfur oxide from said waste flue gas, characterized in that an absorbing device is divided into two stages, i.e. a former stage absorbing device and a latter stage absorbing device, arranged in tandem with respect to the flow of said waste flue gas, and the liquid absorbent is circulated in the former stage absorbing device at a lime available percentage of more than 96% and in the latter stage absorbing device at a lime available percentage of 85 - 95%.
Inventors
- 👤 Masumi Atsukawa
- 👤 Kazumi Kamei
- 👤 Naoharu Shinoda
- 👤 Hiroyuki Ushio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:40
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501; C; C01; C01F; C01F11/00; C01F11/46; C01F11/464
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
In a wet waste flue gas desulfurizing process using lime as absorbent, wherein a sulfur oxide-containing waste flue gas is washed with a liquid absorbent containing calcium hydroxide or calcium carbonate for the purpose of removing the sulfur oxide from said waste flue gas, the improvement wherein a liquid absorbent is circulated through an absorbing device divided into two stages arranged in tandem with respect to the flow of the waste flue gas, said liquid absorbent being circulated and controlled in both stages, such that in the first state absorbing device the liquid absorbent has a lime available percentage of more than 96% and controlled in the second stage absorbing device such that the liquid absorbent has a lime available percentage of 85-95%.
Claim 2
Dependent Claim
123 words
In a wet waste flue gas desulfurizing process using lime as absorbent, wherein a sulfur oxide-containing waste flue gas is washed with a liquid absorbent containing calcium hydroxide or calcium carbonate for the purpose of removing the sulfur oxide from said waste flue gas, the improvement wherein a liquid absorbent is circulated through an absorbing device divided into two stages arranged in tandem with respect to the flow of the waste flue gas, said liquid absorbent being circulated and controlled in both stages, such that in the first state absorbing device the liquid absorbent has a lime available percentage of more than 96% and controlled in the second stage absorbing device such that the liquid absorbent has a lime available percentage of 85-95%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |