US3593494A
Expired / Lapsed
US
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Process for the separation of gaseous mixtures of cyanogen chloride and hydrogen chloride
Assignee: Novartis Corp
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Filing: 1968-08-08
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Granted: 1971-07-20
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Expires: 1988-08-08
Abstract
Abstract Process for the separation of hydrogen chloride from gaseous mixtures incorporating the same in admixture with cyanogen chloride, involving absorption of the hydrogen chloride in water followed by stripping of the aqueous bottoms from the absorber to remove residual cyanogen chloride from the HC1-containing stream and thus facilitate the recovery of HC1 in economically attractive concentrations. The process permits such recovery without substantial concomitant loss of the cyanogen chloride product by hydrolysis.
Inventors
- 👤 William S Durrell
- 👤 Robert J Eckert Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:20
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/004; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456; C01B; C01B7/00; C01B7/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
The process as defined in claim 3, wherein the cyanogen chloride/hydrogen chloride gaseous mixture contains from about 25 to about 75 mole percent cyanogen chloride and from about 25 to about 75 mole percent hydrogen chloride.
Claim 2
Dependent Claim
39 words
The process as defined in claim 1, in which the absorption step (a) is carried out at temperatures of from about 15* to 25* C. and while maintaining gas-liquid contact times of from about 0.3 to about 3.0 seconds.
Claim 3
Dependent Claim
55 words
The process as defined in claim 1, wherein the gaseous mixture of cyanogen chloride and hydrogen chloride and the aqueous liquid stream are passed countercurrent to one another in said absorption zone, and wherein the aqueous hydrogen chloride-containing bottoms stream from said zone is fed countercurrent to a chlorine-containing vapor stream in said stripping zone.
Claim 4
Dependent Claim
25 words
The process as defined in claim 1 wherein stripping of the residual cyanogen chloride from the aqueous effluent is effected by the use of chlorine.
Claim 5
Dependent Claim
26 words
The process as defined in claim 5, wherein the HCl-containing bottoms stream removed from the stripping zone is subsequently heated to remove any dissolved chlorine therefrom.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |