US4134926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ethylene from ethanol
Assignee: Lummus Technology LLC
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Filing: 1977-04-18
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Granted: 1979-01-16
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Expires: 1997-04-18
Abstract
Abstract Ethanol is dehydrated to ethylene at dehydration reaction conditions in the presence of a dehydration catalyst, with the reaction being effected in a fluidized bed of the dehydration catalyst. The use of a fluidized bed has been found to improve overall yields, with it being possible to achieve yields of 99+%.
Inventors
- 👤 Utah Tsao
- 👤 Howard B. Zasloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:30
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/12; C07C2521/16; C07C2529/00; C07C2529/04; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A process for producing ethylene from ethanol, comprising: introducing ethanol into a reactor containing a dehydrating catalyst for dehydrating ethanol to ethylene, said ethanol maintaining said catalyst in a fluidized state in said reactor, said reactor being maintained at a temperature of at least 700° F; withdrawing an ethylene containing effluent from the reactor; withdrawing a portion of the catalyst from the reactor; introducing withdrawn catalyst into a regenerator wherein the catalyst is heated in a fluidized state by heated gas, said heating effecting regeneration of the catalyst; and recycling heated catalyst from the regenerator to the reactor, said heated catalyst providing heat requirements for dehydration of ethanol to ethylene.
Claim 2
Dependent Claim
110 words
A process for producing ethylene from ethanol, comprising: introducing ethanol into a reactor containing a dehydrating catalyst for dehydrating ethanol to ethylene, said ethanol maintaining said catalyst in a fluidized state in said reactor, said reactor being maintained at a temperature of at least 700° F; withdrawing an ethylene containing effluent from the reactor; withdrawing a portion of the catalyst from the reactor; introducing withdrawn catalyst into a regenerator wherein the catalyst is heated in a fluidized state by heated gas, said heating effecting regeneration of the catalyst; and recycling heated catalyst from the regenerator to the reactor, said heated catalyst providing heat requirements for dehydration of ethanol to ethylene.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein ethanol is converted in said reactor at a conversion of at least 99% to provide ethylene in a yield of at least 99%.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the catalyst is selected from the group consisting of alumina, silica-alumina, activated clays and zeolites.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the catalyst is silica-alumina cracking catalyst.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |