US4296266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of lower olefins from methanol/water mixtures
Assignee: Hoechst AG
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Filing: 1980-07-16
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Granted: 1981-10-20
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Expires: 2000-07-16
Abstract
Abstract Olefins having from 2 to 4 carbon atoms are manufactured from methanol and/or dimethyl ether in the presence of water and a manganese-containing aluminum silicate catalyst. Before or after application of the manganese, the aluminum silicate is washed with a solution of ethylene-diaminetetraacetic acid or tartaric acid adjusted to a pH of from 3 to 7 by means of a base.
Inventors
- 👤 Friedrich Wunder
- 👤 Ernst I. Leupold
- 👤 Horst Hachenberg
- 👤 Hans-Joachim Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/076; C; C07; C07C; C07C1/00; C07C1/20; B01J2229/00; B01J2229/30; B01J2229/37; C07C2529/00; C07C2529/04; C07C2529/06; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
Process for the manufacture of C 2 -C 4 -olefins from methanol and/or dimethyl ether in the presence of water, on an aluminum silicate catalyst containing manganese, which comprises washing the catalyst with a solution of ethylenediaminetetraacetic acid or tartaric acid with a pH of 3 to 7.
Claim 2
Dependent Claim
48 words
Process for the manufacture of C 2 -C 4 -olefins from methanol and/or dimethyl ether in the presence of water, on an aluminum silicate catalyst containing manganese, which comprises washing the catalyst with a solution of ethylenediaminetetraacetic acid or tartaric acid with a pH of 3 to 7.
Claim 3
Dependent Claim
14 words
Process as claimed in claim 1, wherein the solution has a pH of 4-5.
Claim 4
Dependent Claim
22 words
Process as claimed in claim 1, wherein the washing is carried out before the application of the manganese to the aluminum silicate.
Claim 5
Dependent Claim
18 words
Process as claimed in claim 1, wherein the washing is carried out with a solution of ethylenediaminetetraacetic acid.
Claim 6
Dependent Claim
15 words
Process as claimed in claim 1, wherein the pH is established with alkali metal hydroxide.
Claim 7
Dependent Claim
17 words
Process as claimed in claim 1, wherein the pH is established with sodium hydroxide or potassium hydroxide.
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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |