US4504688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of pure alkyl tert-alkyl ethers and hydrocarbon raffinates which are largely free from isoolefins and from alkanols
Assignee: Bayer AG
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Filing: 1984-03-07
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Granted: 1985-03-12
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Expires: 2004-03-07
Abstract
Abstract A process for the preparation of pure alkyl tertiary alkyl ethers and hydrocarbon raffinates which are substantially free from tertiary olefins and alkanols. An alkanol and a hydrocarbon mixture containing at least one tertiary olefin are contacted with the alkanol being present in a stoichiometric excess. The reaction product is removed from the reaction zone and excess alkanol in the reaction product or a partial stream thereof is absorbed on a synthetic ion exchanger containing groups which exchange cations or anions or mixtures of such ion exchangers. After absorption of at least a portion of the alkanol on the synthetic ion exchanger, the alkanol is desorbed by contacting the same with a hydrocarbon mixture containing at least one tertiary olefin.
Inventors
- 👤 Jens Herwig
- 👤 Hans-Volker Scheef
- 👤 Bernhard Schleppinghoff
- 👤 Peter M. Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:11
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/34; C07C41/36; C07C41/05; C07C41/06; C07C7/00; C07C7/148; C07C7/14875; C07C7/14891
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
140 words
A process for the preparation of pure alkyl tertiary alkyl ethers and hydrocarbon raffinates which are substantially free from tertiary olefins and alkanols which comprises: (a) contacting an alkanol and a hydrocarbon mixture containing at least one tertiary olefin in a reaction zone, said alkanol being present in a stoichiometric excess; (b) removing the reaction product from the reaction zone and absorbing excess alkanol in said reaction product or a partial stream thereof by absorption on a synthetic ion exchanger containing groups which exchange cations or anions or mixture of such ion exchangers, said absorbing conducted in the liquid phase; (c) following absorption of at least a portion of said alkanol on said synthetic ion exchanger, desorbing said alkanol by contacting the same with feed hydrocarbon mixture containing at least one tertiary olefin, said desorbing conducted in the liquid phase.
Claim 2
Dependent Claim
140 words
A process for the preparation of pure alkyl tertiary alkyl ethers and hydrocarbon raffinates which are substantially free from tertiary olefins and alkanols which comprises: (a) contacting an alkanol and a hydrocarbon mixture containing at least one tertiary olefin in a reaction zone, said alkanol being present in a stoichiometric excess; (b) removing the reaction product from the reaction zone and absorbing excess alkanol in said reaction product or a partial stream thereof by absorption on a synthetic ion exchanger containing groups which exchange cations or anions or mixture of such ion exchangers, said absorbing conducted in the liquid phase; (c) following absorption of at least a portion of said alkanol on said synthetic ion exchanger, desorbing said alkanol by contacting the same with feed hydrocarbon mixture containing at least one tertiary olefin, said desorbing conducted in the liquid phase.
Claim 3
Dependent Claim
47 words
A process according to claim 1, wherein the desorbed alkanol in admixture with said hydrocarbon mixture containing at least one tertiary olefin is thereafter charged to a reaction zone wherein said alkanol is reacted with said tertiary olefin, said reaction zone containing said alkanol in stoichiometric excess.
Claim 4
Dependent Claim
38 words
A process according to claim 2, wherein said desorbed alkanol and said hydrocarbon mixture containing at least tertiary olefin are recycled to the reaction zone from which unre-acted alkanol was removed and absorbed on said synthetic ion exchanger.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein said tertiary olefin is reacted with said alkanol on an acid cation exchanger.
Claim 6
Dependent Claim
24 words
A process according to claim 1, wherein absorption is carried out at 0° to 60° C. under a pressure of 0.1 to 20 bars.
Claim 7
Dependent Claim
24 words
A process according to claim 1, wherein desorption is carried out at 20° to 100° C. under a pressure of 3 to 30 bars.
Claim 8
Dependent Claim
20 words
A process according to claim 6, wherein said desorption is carried out at a pressure of 5 to 15 bars.
Claim 9
Dependent Claim
42 words
A process according to claim 2, wherein absorption is carried out at 0° to 60° C. under a pressure of 0.1 to 20 bars and desorption is carried out at 20° to 100° C. under a pressure of 3 to 30 bars.
Claim 10
Dependent Claim
80 words
A process according to claim 1, wherein said synthetic ion exchanger is in the form of at least 2 divided layers, a first divided layer of which is employed for absorption of alkanol, a second divided layer of which is employed thereafter for alkanol absorption when said first divided layer is undergoing desorption of previously absorbed alkanol and said second divided layer is thereafter desorbed of its absorbed alkanol while said first divided layer is again employed for alkanol absorption.
Claim 11
Dependent Claim
25 words
A process according to claim 1, wherein the rate of desorption is adjusted to 0.5 to ten times the value of the rate of absorption.
Claim 12
Dependent Claim
39 words
A process according to claim 9, wherein the absorption layer and the desorption layer are charged with a weight hourly space velocity (WHSV) of 0.1 to 100 kg of reaction mixture per kg of synthetic ion exchanger per hour.
Claim 13
Dependent Claim
22 words
A process according to claim 11, wherein a higher weight hourly space velocity is established for desorption than is employed for absorption.
Claim 14
Dependent Claim
23 words
A process according to claim 1, wherein the alkanol concentration, relative to the entire composition undergoing absorption, is 0.01 to 90% by weight.
Claim 15
Dependent Claim
63 words
A process according to claim 1, wherein the reaction mixture leaving the reaction zone is initially freed, on an absorber resin, of excess alcohol and is thereafter separated into alkyl tertiary alkyl ether and residual gas by distillation, at least one partial stream obtained by distillation containing an alkanol is thereafter treated to remove alkanol thereof by adsorption on said synthetic ion exchanger.
Claim 16
Dependent Claim
27 words
A process according to claim 1, wherein said synthetic ion exchanger comprises a styrene/divinylbenzene resin containing a sulphonic acid group in the free acid or sodium form.
Claim 17
Dependent Claim
19 words
A process according to claim 1, wherein said synthetic ion exchanger comprises a styrene/divinylbenzene resin containing dimethylbenzyl amino groups.
Claim 18
Dependent Claim
20 words
A process according to claim 1, wherein said synthetic ion exchanger comprises a macroporous cation exchanger doped with elementary palladium.
Claim 19
Dependent Claim
18 words
A process according to claim 1, wherein the synthetic cation exchanger comprises a strongly basic gelatinous styrene/divinylbenzene resin.
Claim 20
Dependent Claim
22 words
A process according to claim 1, wherein said synthetic ion exchanger comprises a condensation resin based on phenol/formaldehyde containing sulfonic acid groups.
Claim 21
Dependent Claim
27 words
A process according to claim 1, wherein said synthetic ion exchanger comprises a macroporous slightly acid cation exchanger of the acrylic acid type which has been cross-linked.
Claim 22
Dependent Claim
19 words
A process according to claim 1, wherein said synthetic ion exchanger comprises a styrene/divinylbenzene ion exchanger containing N-oxide groups.
Claim 23
Dependent Claim
16 words
A process according to claim 1, wherein desorption is carried out at 30° to 60° C.
Claim 24
Dependent Claim
29 words
A process according to claim 1, wherein desorption is carried out with the same hydrocarbon mixture containing at least one tertiary olefin that is directed to the reaction zone.
Claim 25
Dependent Claim
34 words
A process according to claim 1, wherein said absorption is conducted in a first column and said desorption is conducted in a second column, said first column and said second column being parallel thereto.
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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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |