US4148695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation and recovery of ethers
Assignee: Huntsman Specialty Chemicals Corp
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Filing: 1978-07-27
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Granted: 1979-04-10
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Expires: 1998-07-27
Abstract
Abstract Methyl t-butyl ether may be recovered from etherification reaction effluent by extractive distillation in the presence of n-butanol.
Inventors
- 👤 Kung-You Lee
- 👤 Richard V. Kessler
- 👤 Uygur Kokturk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:12
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/34; C07C41/40; C07C41/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
The method which comprises distilling a reaction mixture containing (i) a lower alkanol and (ii) an ether of said lower alkanol and t-butyl alcohol or t-amyl alcohol in an extractive distillation operation in the presence of, as an extractive distillation medium, a C 2 -C 8 aliphatic alcohol having a higher boiling point than said lower alkanol and being substantially miscible therewith thereby forming (iii) extractive distillation overhead containing said ether and (iv) extractive distillation bottoms containing said lower alkanol and extractive distillation medium; recovering said extractive distillation overhead containing said ether; distilling said extractive distillation bottoms in a distillation operation thereby forming distillation operation overhead containing lower alkanol and distillation operation bottoms containing said extractive distillation medium; recovering said distillation operation overhead containing lower alkanol; recovering said distillation operation bottoms containing said extractive distillation medium; and passing said distillation operation bottoms containing said extractive distillation medium to said extractive distillation operation.
Claim 2
Independent Claim
152 words
The method which comprises distilling a reaction mixture containing (i) a lower alkanol and (ii) an ether of said lower alkanol and t-butyl alcohol or t-amyl alcohol in an extractive distillation operation in the presence of, as an extractive distillation medium, a C 2 -C 8 aliphatic alcohol having a higher boiling point than said lower alkanol and being substantially miscible therewith thereby forming (iii) extractive distillation overhead containing said ether and (iv) extractive distillation bottoms containing said lower alkanol and extractive distillation medium; recovering said extractive distillation overhead containing said ether; distilling said extractive distillation bottoms in a distillation operation thereby forming distillation operation overhead containing lower alkanol and distillation operation bottoms containing said extractive distillation medium; recovering said distillation operation overhead containing lower alkanol; recovering said distillation operation bottoms containing said extractive distillation medium; and passing said distillation operation bottoms containing said extractive distillation medium to said extractive distillation operation.
Claim 3
Dependent Claim
28 words
The method claimed in claim 1 wherein said extractive distillation medium has a boiling point at least 10° F. higher than the boiling point of said lower alkanol.
Claim 4
Dependent Claim
15 words
The method claimed in claim 1 wherein said extractive distillation medium is a monohydroxy alcohol.
Claim 5
Dependent Claim
19 words
The method claimed in claim 1 wherein said extractive distillation medium is a C 4 to C 6 alcohol.
Claim 6
Dependent Claim
14 words
The method claimed in claim 1 wherein said extractive distillation medium is a butanol.
Claim 7
Dependent Claim
13 words
The method claimed in claim 1 wherein said extractive distillation medium is n-butanol.
Claim 8
Dependent Claim
14 words
The method claimed in claim 1 wherein said extractive distillation medium is a hexanol.
Claim 9
Dependent Claim
14 words
The method claimed in claim 1 wherein said extractive distillation medium is an octanol.
Claim 10
Dependent Claim
14 words
The method claimed in claim 1 wherein said lower alkanol is methanol or ethanol.
Claim 11
Independent Claim
108 words
The method which comprises distilling a reaction mixture containing (i) methanol and (ii) an ether of said methanol and t-butyl alcohol or t-amyl alcohol in an extractive distillation operation in the presence of n-butanol thereby forming extractive distillation overhead containing said ether and extractive distillation bottoms containing said methanol and n-butanol; recovering said extractive distillation overhead containing said ether; distilling said extractive distillation bottoms in a distillation operation thereby forming distillation operation overhead containing methanol and distillation operation bottoms containing n-butanol; recovering said distillation operation overhead containing methanol; recovering said distillation operation bottoms containing n-butanol; and passing said distillation operation bottoms containing n-butanol to said extractive distillation operation.
Claim 12
Independent Claim
108 words
The method which comprises distilling a reaction mixture containing (i) methanol and (ii) an ether of said methanol and t-butyl alcohol or t-amyl alcohol in an extractive distillation operation in the presence of n-butanol thereby forming extractive distillation overhead containing said ether and extractive distillation bottoms containing said methanol and n-butanol; recovering said extractive distillation overhead containing said ether; distilling said extractive distillation bottoms in a distillation operation thereby forming distillation operation overhead containing methanol and distillation operation bottoms containing n-butanol; recovering said distillation operation overhead containing methanol; recovering said distillation operation bottoms containing n-butanol; and passing said distillation operation bottoms containing n-butanol to said extractive distillation operation.
Claim 13
Independent Claim
91 words
The method which comprises distilling a reaction mixture containing (i) a lower alkanol and (ii) an ether of said lower alkanol and t-butyl alcohol or t-amyl alcohol in an extractive distillation operation in the presence of, as an extractive distillation medium, a C 2 -C 8 aliphatic alcohol having a higher boiling point than said lower alkanol and being substantially miscible therewith thereby forming extractive distillation overhead containing said ether and extractive distillation bottoms containing said lower alkanol and extractive distillation medium; and recovering said extractive distillation overhead containing said ether.
Claim 14
Independent Claim
91 words
The method which comprises distilling a reaction mixture containing (i) a lower alkanol and (ii) an ether of said lower alkanol and t-butyl alcohol or t-amyl alcohol in an extractive distillation operation in the presence of, as an extractive distillation medium, a C 2 -C 8 aliphatic alcohol having a higher boiling point than said lower alkanol and being substantially miscible therewith thereby forming extractive distillation overhead containing said ether and extractive distillation bottoms containing said lower alkanol and extractive distillation medium; and recovering said extractive distillation overhead containing said ether.
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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |