US3793801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of chlorinated hydrocarbon
Assignee: Lummus Technology LLC
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Filing: 1972-09-28
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Granted: 1974-02-26
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Expires: 1992-09-28
Abstract
Abstract A chlorinated hydrocarbon, such as dichloroethane, is recovered from an oxychlorination reaction effluent by cooling the effluent to condense chlorinated hydrocarbon and water, combining the remaining gas with hydrogen chloride in an amount to produce, in the subsequent cooling step, an aqueous hydrogen chloride condensate which does not freeze, and cooling the combined stream to condense remaining chlorinated hydrocarbon and aqueous hydrogen chloride.
Inventors
- 👤 U Tsao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:31
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D53/70; C07C17/093; C07C17/15; C07C17/152; C07C17/156; Y; Y02; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
The process of claim 1 wherein the aqueous hydrogen chloride solution provided in step (d) contains at least about 10 percent, by weight, of hydrogen chloride.
Claim 2
Dependent Claim
24 words
The process of claim 2 wherein the remaining stream in step (d) is cooled to a temperature which is about 25*F. to about -25*F.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein said cooling of step (d) is effected by passing said remaining stream and added hydrogen chloride from step (c) downwardly through a cooling zone.
Claim 4
Dependent Claim
41 words
The process of claim 4 wherein the cooling in step (d) is effected to a temperature which is at about 25*F. to about -25*F. and said aqueous hydrogen chloride solution contains at least about 10 percent, by weight, of hydrogen chloride.
Claim 5
Dependent Claim
56 words
The process of claim 1 and further comprising recovering aqueous hydrogen chloride from step (d), concentrating the aqueous hydrogen chloride to produce an aqueous hydrogen chloride having a hydrogen chloride concentration of at least about 20 weight percent and employing said aqueous hydrogen chloride having a concentration of at least 20 weight percent in step (c).
Claim 6
Dependent Claim
142 words
In an oxychlorination process to produce a gaseous effluent comprising chlorinated hydrocarbon and water, an improved process for recovering chlorinated hydrocarbon, comprising: a. cooling said gaseous effluent to a temperature above the freezing point of water to condense water and a major portion of the chlorinated hydrocarbon; b. separating the condensed portion from the remaining gaseous stream; c. adding hydrogen chloride to said remaining gaseous stream in an amount sufficient to provide in step (d) an aqueous hydrogen chloride solution which is above its freezing point at the tempeRature of step (d); and d. cooling the remaining stream from step (c) to a temperature from about 25*F. to about -25*F., said cooling condensing further chlorinated hydrocarbon and water, said condensed water combining with the added hydrogen chloride to provide an aqueous hydrogen chloride solution having a freezing point below said cooling temperature.
Claim 7
Dependent Claim
30 words
The process of claim 7 wherein the cooling of step (d) is effected by passing said remaining stream and added hydrogen chloride from step (c) downwardly through a cooling zone.
Claim 8
Dependent Claim
17 words
The process of claim 7 wherein the hydrogen chloride added in step (c) is anhydrous hydrogen chloride.
Claim 9
Dependent Claim
11 words
The process of claim 9 wherein the chlorinated hydrocarbon is 1,2-dichloroethane.
Claim 10
Dependent Claim
53 words
The process of claim 10 wherein the cooling in step (d) is to a temperature from about 0*F. to about -25*F. and the hydrogen chloride is added in step (c) to provide an aqueous hydrogen chloride solution in step (d) having from about 15 percent to about 25 percent, by weight, hydrogen chloride.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |