US3305308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for isolating hydrocyanic acid or mixtures of hydrocyanic acid with nitriles from gas mixtures containing ammonia
Assignee: Knapsack AG
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Filing: 1962-11-06
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Granted: 1967-02-21
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Expires: 1982-11-06
Abstract
No abstract record available.
Inventors
- 👤 Sennewald Kurt
- 👤 Vogt Wilhelm
- 👤 Kandler Joachim
- 👤 Sommerfeld Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:28
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/04; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A PROCESS FOR ISOLATING AND RECOVERING AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HYDROCYANIC AID AND NITRILES FROM AMMONIA-CONTAINING GAS MIXTURES, WHICH COMPRISES REMOVING IN A WASHING STEP AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HYDROCYANIC ACID AND NITRILES FROM THE AMMONIACONTAINING GAS MIXTURE SUED AS THE STARTING GAS MIXTURE BY WASHING SAID GAS MIXTURE WITH AT LEAST ONE LIQUID NITRILE SELECTED FROM THE GROUP CONSISTING OF B-METHOXYPROPIONITRILE, B-ETHOXYPROPIONITRILE, B-N-PROPOXYPROPIONITRILE, BI-PROPOXYPROPIONITRILE, B - N-BUTOXYPROPIONITRILE, B-I-BUTOXYPROPIONITRILE, B-PENTOXYPROPIONITRILE, B,B''-DICYANODIETHYLETHER, B - CYCLOPENTOXYPROPIONITRILE, B-CYCLOHEXOXYPROPIONITRILE, AND B-BENZOXYPROPIONITRILE AS THE WASH LIQUID HAVING A BOILING POINT SUFFICIENTLY DIFFERENT FROM THAT OF THE NITRILES WASHED OUT AND THEREBY PERMITTING THE NITRILES TO BE ISOLATED BY DISTILLATION, THE SAID HYDROCYANIC ACID AND THE SAID NITRILE BEING DISSOLVED THEREBY, DISTILLING AND THEREBY ISOLATING THE DISSOLVED SUBSTANCES WHICH ARE SELECTED FROM THE GROUP CONSISTING OF HYDROCYANIC ACID AND NITRILES FROM THE WASH LIQUID BY COMMON DISTILLATION, AND RECOVERING FREE AMMONIA CONTAINED IN THE OFF-GAS ESCAPING FROM THE WASHING STEP.
Claim 2
Dependent Claim
166 words
A PROCESS FOR ISOLATING AND RECOVERING AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HYDROCYANIC AID AND NITRILES FROM AMMONIA-CONTAINING GAS MIXTURES, WHICH COMPRISES REMOVING IN A WASHING STEP AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HYDROCYANIC ACID AND NITRILES FROM THE AMMONIACONTAINING GAS MIXTURE SUED AS THE STARTING GAS MIXTURE BY WASHING SAID GAS MIXTURE WITH AT LEAST ONE LIQUID NITRILE SELECTED FROM THE GROUP CONSISTING OF B-METHOXYPROPIONITRILE, B-ETHOXYPROPIONITRILE, B-N-PROPOXYPROPIONITRILE, BI-PROPOXYPROPIONITRILE, B - N-BUTOXYPROPIONITRILE, B-I-BUTOXYPROPIONITRILE, B-PENTOXYPROPIONITRILE, B,B''-DICYANODIETHYLETHER, B - CYCLOPENTOXYPROPIONITRILE, B-CYCLOHEXOXYPROPIONITRILE, AND B-BENZOXYPROPIONITRILE AS THE WASH LIQUID HAVING A BOILING POINT SUFFICIENTLY DIFFERENT FROM THAT OF THE NITRILES WASHED OUT AND THEREBY PERMITTING THE NITRILES TO BE ISOLATED BY DISTILLATION, THE SAID HYDROCYANIC ACID AND THE SAID NITRILE BEING DISSOLVED THEREBY, DISTILLING AND THEREBY ISOLATING THE DISSOLVED SUBSTANCES WHICH ARE SELECTED FROM THE GROUP CONSISTING OF HYDROCYANIC ACID AND NITRILES FROM THE WASH LIQUID BY COMMON DISTILLATION, AND RECOVERING FREE AMMONIA CONTAINED IN THE OFF-GAS ESCAPING FROM THE WASHING STEP.
References Cited (Backward Citations)
US2803642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |