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US4053532A
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Method for improving the fischer-tropsch synthesis product distribution
Assignee: Mobil Oil AS
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Filing: 1975-12-05
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Granted: 1977-10-11
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Expires: 1995-12-05
Abstract
Abstract The product of Fischer-Tropsch Synthesis is separated to recover a product boiling above about 400° F which is thereafter processed over a selective crystalline zeolite under hydrodewaxing conditions promoting the formation of fuel oil and gasoline products. Improving start up and operation of the process in the presence of a ZSM5 crystalline zeolite is described.
Inventors
- 👤 Henry R. Ireland
- 👤 Thomas R. Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:33
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/04; C10L1/06; C10G; C10G3/00; C10G3/42; C10G3/44; C10G3/48; C10G3/49; C10G3/50; C10G45/00; C10G45/58; C10G45/60; C10G45/64; C10G2300/00; C10G2300/10; C10G2300/1022; C10G2300/80; C10G2300/805; C10G2300/807; C10G2400/00; C10G2400/02; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y10; Y10S; Y10S208/00; Y10S208/95
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
In a process for hydrodewaxing a Fischer-Tropsch decant oil fraction boiling in the range of 400° F. to about 1000° F. wherein the heavy oil fraction is contacted in the presence of hydrogen with a crystalline zeolite catalyst having a pore diameter greater than about 5 Angstroms; a silica-to-alumina ratio of at least 12; a constraint index within the range of 1 to 12; the method for improving the catalyst selectivity and aging rate during said operation which comprises preconditioning said catalyst by, a. heating the catalyst gradually with hydrogen at 800° F. for two hours at a pressure of about 500 psig, b. sulfiding the hydrogen treated catalyst at a temperature within the range of 500° to 750° F., c. contacting the sulfided catalyst with a steam-hydrogen mixture at 800° F for 24 hours, and d. reducing the temperature of the steam treated catalyst to about 500° F before initially contacting the oil charge therewith under hydrodewaxing conditions.
Claim 2
Dependent Claim
159 words
In a process for hydrodewaxing a Fischer-Tropsch decant oil fraction boiling in the range of 400° F. to about 1000° F. wherein the heavy oil fraction is contacted in the presence of hydrogen with a crystalline zeolite catalyst having a pore diameter greater than about 5 Angstroms; a silica-to-alumina ratio of at least 12; a constraint index within the range of 1 to 12; the method for improving the catalyst selectivity and aging rate during said operation which comprises preconditioning said catalyst by, a. heating the catalyst gradually with hydrogen at 800° F. for two hours at a pressure of about 500 psig, b. sulfiding the hydrogen treated catalyst at a temperature within the range of 500° to 750° F., c. contacting the sulfided catalyst with a steam-hydrogen mixture at 800° F for 24 hours, and d. reducing the temperature of the steam treated catalyst to about 500° F before initially contacting the oil charge therewith under hydrodewaxing conditions.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein steam is added with the heavy oil fraction brought in contact with said crystalline zeolite catalyst.
Claim 4
Dependent Claim
39 words
The method of claim 1 wherein the crystalline zeolite is characterized as having a pore opening of at least 5 Angstroms, a silica-alumina ratio of at least 12 and a constraint index within the range of 1 to 12.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the crystalline zeolite catalyst comprises a hydrogenating component.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein the hydrodewaxing operation is accomplished over a temperature span in the range of 500° to 800° F. and the pressure is maintained within the range of 25 to 1500 psig.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |