US4539190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the treatment of exhaust gases
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1984-09-11
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Granted: 1985-09-03
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Expires: 2004-09-11
Abstract
Abstract A method for the wet treatment of combustion exhaust gases comprising SO 2 and HCl, the method comprising detecting an amount of HCl in the exhaust gas and feeding, to an exhaust gas treating tower, a sodium salt in an amount corresponding to at least the detected amount of HCl so that all the HCl is able to be converted into NaCl in the exhaust gas treating tower, along with CaCO 3 or Ca(OH) 2 used as an SO 2 absorbent.
Inventors
- 👤 Naoharu Shinoda
- 👤 Atsushi Tatani
- 👤 Kenji Inoue
- 👤 Susumu Okino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:34
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D53/30; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
A method for the wet treatment of a combustion exhaust gas comprising SO 2 and HCl, the method comprising detecting an amount of HCl in the exhaust gas, and feeding, to a circulating slurry in an exhaust gas treating tower, (a) a sodium salt in an amount corresponding to at least the detected amount of HCl so that all the HCl is able to be converted into NaCl in the exhaust gas treating tower and (b) CaCO 3 or Ca(OH) 2 serving as an absorbent for SO 2 .
Claim 2
Independent Claim
89 words
A method for the wet treatment of a combustion exhaust gas comprising SO 2 and HCl, the method comprising detecting an amount of HCl in the exhaust gas, and feeding, to a circulating slurry in an exhaust gas treating tower, (a) a sodium salt in an amount corresponding to at least the detected amount of HCl so that all the HCl is able to be converted into NaCl in the exhaust gas treating tower and (b) CaCO 3 or Ca(OH) 2 serving as an absorbent for SO 2 .
Claim 3
Dependent Claim
54 words
The method according to claim 1, wherein the sodium salt is added to the slurry in the absorption tower in an amount sufficient to satisfy the following equation [Na.sup.+ ]≧[Cl.sup.- ] in which [Na + ] represents a molar concentration of sodium ions, and [Cl - ] represents a molar concentration of chlorine ions.
References Cited (Backward Citations)
US3876750A
Cited
US4108959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |