US3729899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of ethylene oxide from admixed inert gaseous components
Assignee: Shell USA Inc
•
Filing: 1971-06-23
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Granted: 1973-05-01
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Expires: 1991-06-23
Abstract
Abstract Ethylene oxide is separated from admixed inert gaseous components and recovered as a gaseous fraction by (a) contacting the gaseous mixture with a lean aqueous absorbant to produce an ethylene oxide-rich absorbate; (b) flashing the ethylene oxiderich absorbate at a temperature below about 65* C to produce a condensate lean in inerts; and (c) contacting, in an ethylene oxide stripping zone, the inerts-lean condensate with a stripping vapor at or slightly above atmospheric pressure to produce a gaseous overhead rich in ethylene oxide.
Inventors
- 👤 J Cunningham
- 👤 G Foster
- 👤 R Vanderwater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:41
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
The process of claim 1 wherein the inerts-rich, gaseous overhead is compressed and recycled back to the absorption zone, thereby recovering ethylene and ethylene oxide contained therein.
Claim 2
Dependent Claim
24 words
The process of claim 2 wherein the condensate resulting from cooling of the compressed gaseous overhead is recycled to the absorber bottoms flash zone.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the residence time of material within the absorber bottoms flash zone is about 20 seconds to about 10 minutes.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the stripping zone is maintained at a pressure of about 15 to about 35 psia.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the gaseous stripping zOne overhead is condensed by indirect heat exchange with ordinary cooling 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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |