Patent US3847756A successfully refreshed from Google Patents.
US3847756A
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Recovery of diethyl ether from an olefin hydration product stream by extractive distillation with water
Assignee: Eastman Kodak Co
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Filing: 1972-11-09
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Granted: 1974-11-12
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Expires: 1992-11-09
Abstract
Abstract This invention relates to a process for the purification of diethyl ether whereby an impure stream of diethyl ether is fed into a distillation column at a point about one-third above the bottom of the column. An approximately equal volume of water is introduced in the column at a point about two-thirds above the bottom of the column. A stream of essentially pure diethyl ether is removed from the column at a point about five-sixths above the bottom of the column. Low boiling impurities are removed from the top of the column and water containing ethyl alcohol and high boiling impurities is removed from the bottom of the column.
Inventors
- 👤 M Statman
- 👤 R Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:29
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/34; C07C41/40; C07C41/42
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
8 words
A PROCESS FOR PURIFICATION OF DIETHYL WHICH COMPRISES:
Claim 2
Dependent Claim
8 words
A PROCESS FOR PURIFICATION OF DIETHYL WHICH COMPRISES:
Claim 3
Dependent Claim
48 words
FEEDING AN IMPURE STREAM COMPRISING DIETHYL ETHER, ETHYL ALCOHOL, WATER, BUTENE, SECONDARY BUTANOL AND OTHER IMPURITIES NORMALLY ASSOCIATED WITH CRUDE DIETHYL ETHER INTO AN EXTRACTIVE DISTILLATION COLUMN AT A POINT ABOUT ONE-THIRD OF THE WAY, IN TERMS OF THEORETICAL DISTILLATION TRAYS UP FROM THE BOTTOM OF THE COLUMN
Claim 4
Dependent Claim
48 words
FEEDING AN IMPURE STREAM COMPRISING DIETHYL ETHER, ETHYL ALCOHOL, WATER, BUTENE, SECONDARY BUTANOL AND OTHER IMPURITIES NORMALLY ASSOCIATED WITH CRUDE DIETHYL ETHER INTO AN EXTRACTIVE DISTILLATION COLUMN AT A POINT ABOUT ONE-THIRD OF THE WAY, IN TERMS OF THEORETICAL DISTILLATION TRAYS UP FROM THE BOTTOM OF THE COLUMN
Claim 5
Dependent Claim
48 words
FEEDING A QUANTITY OF WATER ABOUT EQUAL TO FORM ABOUT 75 PERCENT TO ABOUT 300 PERCENT OF THE QUANTITY OF THE CRUDE FEED STREAM INTO THE COLUMN AT A POINT ABOUT TWO-THIRDS OF THE WAY, IN TERMS OF THERORETICAL DISTILLATION TRAYS, UP THE COLUMN FROM THE BOTTOM; AND
Claim 6
Dependent Claim
48 words
FEEDING A QUANTITY OF WATER ABOUT EQUAL TO FORM ABOUT 75 PERCENT TO ABOUT 300 PERCENT OF THE QUANTITY OF THE CRUDE FEED STREAM INTO THE COLUMN AT A POINT ABOUT TWO-THIRDS OF THE WAY, IN TERMS OF THERORETICAL DISTILLATION TRAYS, UP THE COLUMN FROM THE BOTTOM; AND
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the purification column is operated at atmospheric pressure.
Claim 8
Dependent Claim
48 words
feeding a quantity of water about equal to from about 75 percent to about 300 percent of the quantity of the crude feed stream into the column at a point about two-thirds of the way, in terms of theoretical distillation trays, up the column from the bottom; and
Claim 9
Dependent Claim
48 words
feeding a quantity of water about equal to from about 75 percent to about 300 percent of the quantity of the crude feed stream into the column at a point about two-thirds of the way, in terms of theoretical distillation trays, up the column from the bottom; and
Claim 10
Dependent Claim
29 words
recovering a substantially pure stream of wet diethyl ether from a point about five-sixths of the way, in terms of theoretical distillation trays, up the column from the bottom.
Claim 11
Dependent Claim
29 words
recovering a substantially pure stream of wet diethyl ether from a point about five-sixths of the way, in terms of theoretical distillation trays, up the column from the bottom.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein the purification column is operated at a pressure greater than atmospheric.
Claim 13
Dependent Claim
8 words
RECOVERING A SUBSTANTIALLY PURE STREAM OF WET DIETHYL
Claim 14
Dependent Claim
8 words
RECOVERING A SUBSTANTIALLY PURE STREAM OF WET DIETHYL
Claim 15
Dependent Claim
24 words
The process of claim 1 wherein the quantity of water is about equal to 100 percent of the quantity of the crude feed stream.
Claim 16
Dependent Claim
22 words
The process of claim 1 wherein the distillation column is operated at a reflux ratio of from about 1.5:1 to about 4:1.
Claim 17
Dependent Claim
12 words
The process of claim 5 wherein the reflux ratio is about 2.5:
Claim 18
Dependent Claim
34 words
The process of claim 1 wherein the low boiling impurities are removed from the top of the distillation column and water containing high boiling impurities is removed from the bottom of the distillation column.
References Cited (Backward Citations)
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Cited
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Cited
US2610141A
Cited
US2648711A
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US2806816A
Cited
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Cited
US3445345A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |