Patent US3060384A successfully refreshed from Google Patents.
Patent US3980758A successfully refreshed from Google Patents.
US3980758A
Expired / Lapsed
US
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Process for the combustion of chlorine containing wastes
Assignee: Hoechst AG
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Filing: 1975-04-29
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Granted: 1976-09-14
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Expires: 1995-04-29
Abstract
Abstract A process for the combustion of chlorine containing residues and wastes with simultaneous recovery of the hydrogen chlorine thereby obtained, which comprises burning the chlorine containing residues with an excess of air and simultaneous addition of azeotropically boiling hydrochloric acid formed in the work-up of the combustion gases.
Inventors
- 👤 Reinhard Krumbock
- 👤 Wenzel Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:48
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D2257/00; B01D2257/20; B01D2257/204; B01D2257/2045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
128 words
A process for the combustion of chlorine-containing residues or wastes with simultaneous recovery of the hydrogen chloride gas formed by said combustion, which comprises: a. burning the chlorine-containing residues or wastes at temperatures of from 600° to 1500°C in a combustion zone in the presence of excess air, b. simultaneously with said burning injecting azeotropic hydrochloric acid into the combustion zone and cooling same, c. washing the hydrogen chloride gas-containing combustion gases with azeotropic hydrochloric acid whereby the hydrogen chloride gas is absorbed by the azeotropic hydrochloric acid yielding hydrochloric acid of higher than azeotropic concentration, d. recovering hydrogen chloride gas and azeotropic hydrochloric acid from the hydrochloric acid of higher than azeotropic concentration, and e. recycling the recovered azeotropic hydrochloric acid to steps (b) and (c) above.
Claim 2
Dependent Claim
128 words
A process for the combustion of chlorine-containing residues or wastes with simultaneous recovery of the hydrogen chloride gas formed by said combustion, which comprises: a. burning the chlorine-containing residues or wastes at temperatures of from 600° to 1500°C in a combustion zone in the presence of excess air, b. simultaneously with said burning injecting azeotropic hydrochloric acid into the combustion zone and cooling same, c. washing the hydrogen chloride gas-containing combustion gases with azeotropic hydrochloric acid whereby the hydrogen chloride gas is absorbed by the azeotropic hydrochloric acid yielding hydrochloric acid of higher than azeotropic concentration, d. recovering hydrogen chloride gas and azeotropic hydrochloric acid from the hydrochloric acid of higher than azeotropic concentration, and e. recycling the recovered azeotropic hydrochloric acid to steps (b) and (c) above.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the temperature of step (a) is 1000°-1200°C.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |