US4330679A
Expired / Lapsed
US
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Process for the preparation of alkyl tert.-alkyl ethers
Assignee: Erdoelchemie GmbH
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Filing: 1981-06-24
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Granted: 1982-05-18
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Expires: 2001-06-24
Abstract
Abstract In a process for the preparation of an alkyl tert.-alkyl ether by reaction of an isoolefin branched at the double bond and an alkanol in the presence of a cation exchanger, the improvement which comprises: (a) Employing as the cation exchanger a macroporous or gelatinous acid cation exchanger in the H + form which has been charged with 0.1 to 5 grams, per one liter of dry cation exchanger, of an elementary form of a metal of sub-groups VI, VII or VIII of the periodic table of elements (Mendeleev) which cation exchanger is crosslinked with the degree of crosslinking of 2 to 65% and has a specific surface area of 5 to 750 square meters per gram on the basis of dry cation exchange resin; and (b) The reaction is carried out in the liquid phase at a temperature of 30° to 140° C. at a pressure of 2 to 100 bars employing a molar ratio of isoolefin to alkanol of 0.1 to 5.
Inventors
- 👤 Hans-Dieter Kohler
- 👤 Bernhard Schleppinghoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:33
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01J31/10; C; C07; C07C; C07C41/00; C07C41/01; C07C41/05; C07C41/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
164 words
In a process for the preparation of an alkyl tert.-alkyl ether by reaction of an isoolefin branched at the double bond and an alkanol in the presence of a cation exchanger, the improvement which comprises: (a) employing as the cation exchanger a macroporous or gelatinous acid cation exchanger in the H + form which has been charged with 0.1 to 5 grams, per one liter of dry cation exchanger, of an elementary form of a metal of sub-groups VI, VII or VIII of the periodic table of elements (Mendeleev) which cation exchanger is crosslinked with the degree of crosslinking of 2 to 65% and has a specific surface area of 5 to 750 square meters per gram on the basis of dry cation exchange resin; and (b) the reaction is carried out in the liquid phase at a temperature of 30° to 140° C. at a pressure of 2 to 100 bars employing a molar ratio of isoolefin to alkanol of 0.1 to 5.
Claim 2
Dependent Claim
164 words
In a process for the preparation of an alkyl tert.-alkyl ether by reaction of an isoolefin branched at the double bond and an alkanol in the presence of a cation exchanger, the improvement which comprises: (a) employing as the cation exchanger a macroporous or gelatinous acid cation exchanger in the H + form which has been charged with 0.1 to 5 grams, per one liter of dry cation exchanger, of an elementary form of a metal of sub-groups VI, VII or VIII of the periodic table of elements (Mendeleev) which cation exchanger is crosslinked with the degree of crosslinking of 2 to 65% and has a specific surface area of 5 to 750 square meters per gram on the basis of dry cation exchange resin; and (b) the reaction is carried out in the liquid phase at a temperature of 30° to 140° C. at a pressure of 2 to 100 bars employing a molar ratio of isoolefin to alkanol of 0.1 to 5.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein the reaction is carried out in the presence of a solvent.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein the metal of sub-groups VI, VII or VIII is selected from the group consisting of chromium, rhenium, palladium, platinum and, iron and mixtures thereof.
Claim 5
Dependent Claim
43 words
A process according to claim 1, wherein said cation exchanger is one prepared by depositing said metal of sub-groups VI, VII and VIII on said cation exchange resin in ionic form and thereon converting the same to elementary form by contact with hydrogen.
Claim 6
Dependent Claim
29 words
A process according to claim 4, wherein said metal is converted into the elementary form at 50° to 140° C. employing a hydrogen pressure of 2 to 50 bars.
Claim 7
Dependent Claim
18 words
A process according to claim 1, wherein the molar ratio of isoolefin to alkanol is 0.9 to 1.1.
Claim 8
Dependent Claim
20 words
A process according to claim 1, wherein the process is carried out at a space velocity of 0.1 to 10.
Claim 9
Dependent Claim
20 words
A process according to claim 1, wherein the reaction is carried out at a temperature of 50° to 130° C.
Claim 10
Dependent Claim
20 words
A process according to claim 1, wherein the process is carried out at a pressure of 3 to 30 bars.
Claim 11
Dependent Claim
27 words
A process according to claim 1, wherein the process is carried out employing a saturated, branched and/or unbranched hydrocarbon of at least 4 carbon atoms as solvent.
Claim 12
Dependent Claim
30 words
A process according to claim 1, wherein a recycle stream in a weight ratio of 0.1 to 10:1, relative to the feed stream, is additionally fed in for the etherification.
Claim 13
Dependent Claim
20 words
A process according to claim 1, wherein the process is carried out at a pressure of at least 5 bars.
Claim 14
Dependent Claim
20 words
A process according to claim 1, wherein the process is carried out at a pressure of at least 8 bars.
Claim 15
Dependent Claim
20 words
A process according to claim 1, wherein the process is carried out at a pressure of at least 10 bars.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |