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US3147069A
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US
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Continuous processing of the waste gases from the white calcium cyanamide manufacture
Assignee: Evonik Operations GmbH
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Filing: 1960-12-21
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Granted: 1964-09-01
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Expires: 1980-12-21
Abstract
No abstract record available.
Inventors
- 👤 Hoger Herwig
- 👤 Kaess Franz
- 👤 Kronacher Hermann
- 👤 Fischer Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:29
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/16; C01C3/18; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR THE CONTINUOUS PROCESSING OF THE WASTE GASES FROM THE WHITE CALCIUM CYANAMIDE MANUFACTURE WHICH GASES CONTAIN AMMONIA, HYDROCYANIC ACID, AND ABOUT 6 TO 11 PERCENT OF CARBON DIOXIDE, SAID METHOD COMPRISING CONTACTING THE GASES IN A SCRUBBING STAGE CONTAINING A NEUTRAL TO WEAKLY ACIDIC SOLUTION FOR A PERIOD OF 1 TO 10 SECONDS, THEREBY REMOVING SUBSTANTIALLY THE ENTIRE AMMONIA AND HYDROCYANIC ACID AND ONLY PART OF SAID CARBON DIOXIDE, WHICH PART DOES NOT EXCEED 10 PERCENT OF THE CARBON DIOXIDE PRESENT, SUBJECTING SAID SOLUTION TO DISTILLATIVE REGENERATION, THE VAPORS OF SAID DISTILLATION CONTAINING ESSENTIALLY SAID ABSORBED AMMONIA, HYDROCYANIC ACID, AND CARBON DIOXIDE, CONTINOUSLY RETURNING THE STRIPPED SCRUBBING SOLUTION TO THE SCRUBBING STAGE, COOLING SAID VAPORS TO A TEMPERATURE OF ABOUT 55 TO 65*C. SO AS TO CONDENSE THE MAJOR PART OF THE WATER
Claim 2
Independent Claim
136 words
A METHOD FOR THE CONTINUOUS PROCESSING OF THE WASTE GASES FROM THE WHITE CALCIUM CYANAMIDE MANUFACTURE WHICH GASES CONTAIN AMMONIA, HYDROCYANIC ACID, AND ABOUT 6 TO 11 PERCENT OF CARBON DIOXIDE, SAID METHOD COMPRISING CONTACTING THE GASES IN A SCRUBBING STAGE CONTAINING A NEUTRAL TO WEAKLY ACIDIC SOLUTION FOR A PERIOD OF 1 TO 10 SECONDS, THEREBY REMOVING SUBSTANTIALLY THE ENTIRE AMMONIA AND HYDROCYANIC ACID AND ONLY PART OF SAID CARBON DIOXIDE, WHICH PART DOES NOT EXCEED 10 PERCENT OF THE CARBON DIOXIDE PRESENT, SUBJECTING SAID SOLUTION TO DISTILLATIVE REGENERATION, THE VAPORS OF SAID DISTILLATION CONTAINING ESSENTIALLY SAID ABSORBED AMMONIA, HYDROCYANIC ACID, AND CARBON DIOXIDE, CONTINOUSLY RETURNING THE STRIPPED SCRUBBING SOLUTION TO THE SCRUBBING STAGE, COOLING SAID VAPORS TO A TEMPERATURE OF ABOUT 55 TO 65*C. SO AS TO CONDENSE THE MAJOR PART OF THE WATER
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |