Patent US4579986A successfully refreshed from Google Patents.
US4579986A
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Process for the preparation of hydrocarbons
Assignee: Shell USA Inc
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Filing: 1985-03-26
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Granted: 1986-04-01
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Expires: 2005-03-26
Abstract
Abstract Syngas is subjected to Fischer-Tropsch synthesis over a Co/Zr/SiO 2 catalyst and the C 20 + fraction of the synthesized product is converted into linear C 10 -C 20 olefins by mild thermal cracking.
Inventors
- 👤 Swan T. Sie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:42
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/75; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/864; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/043; C07C1/0435; C07C1/0445; C07C1/0485; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2521/12; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26; C07C2523/70; C07C2523/74; C07C2523/75; C07C2523/76; C07C2523/84; C07C2523/85; C07C2523/86; Y; Y10; Y10S; Y10S208/00; Y10S208/95
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A process for the preparation of linear C 10 -C 20 olefins, which comprises preparing a mixture of hydrocarbons substantially consisting of linear paraffins by: (a) Contacting a mixture of carbon monoxide and hydrogen at elevated temperature and pressure with a catalyst comprising 3-60 pbw of cobalt and 0.1-100 pbw of at least one other metal chosen from the group formed by zirconium, titanium and chromium per 100 pbw of silica, alumina or silica-alumina carrier, which catalyst has been prepared by kneading and/or impregnation, (b) Separating from the paraffin mixture thus prepared a heavy fraction which consists substantially of C 20 + paraffins, and (c) Converting at least this heavy fraction by mild thermal cracking into a mixture of hydrocarbons which consists substantially of linear olefins and contains the desired C 10 -C 20 olefins.
Claim 2
Dependent Claim
135 words
A process for the preparation of linear C 10 -C 20 olefins, which comprises preparing a mixture of hydrocarbons substantially consisting of linear paraffins by: (a) Contacting a mixture of carbon monoxide and hydrogen at elevated temperature and pressure with a catalyst comprising 3-60 pbw of cobalt and 0.1-100 pbw of at least one other metal chosen from the group formed by zirconium, titanium and chromium per 100 pbw of silica, alumina or silica-alumina carrier, which catalyst has been prepared by kneading and/or impregnation, (b) Separating from the paraffin mixture thus prepared a heavy fraction which consists substantially of C 20 + paraffins, and (c) Converting at least this heavy fraction by mild thermal cracking into a mixture of hydrocarbons which consists substantially of linear olefins and contains the desired C 10 -C 20 olefins.
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein a H 2 /CO mixture is used which has been obtained, starting from light hydrocarbons, by steam reforming or partial oxidation.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein H 2 /CO mixture is used which has been obtained starting from natural gas.
Claim 5
Dependent Claim
68 words
The process of claim 1, wherein a cobalt catalyst is used which satisfies the relation (3+4R)>L/S>(0.3+0.4R), wherein L=the total quantity of cobalt present on the catalyst, expressed as mg Co/ml catalyst, S=the surface area of the catalyst, expressed as m 2 /ml catalyst, and R=the weight ratio of the quantity of cobalt deposited on the catalyst by kneading to the total quantity of cobalt present on the catalyst.
Claim 6
Dependent Claim
64 words
The process of claim 1, wherein a cobalt catalyst is used which, per 100 pbw of carrier, comprises 15-50 pbw of cobalt and either 0.1-5 pbw of the other metal when during the preparation cobalt was deposited first and the other metal next, or 5-40 pbw of the other metal when during the preparation the other metal was deposited first and the cobalt next.
Claim 7
Dependent Claim
21 words
The process of claim 1, wherein a cobalt catalyst is used which comprises zirconium as other metal and silica as carrier.
Claim 8
Dependent Claim
23 words
The process of claim 1, wherein step (a) is carried out at a temperature of 125°-350° C. and a pressure of 5-100 bar.
Claim 9
Dependent Claim
23 words
The process of claim 1, wherein step (a) is carried out at a temperature of 175°-275° C. and a pressure of 10-75 bar.
Claim 10
Dependent Claim
30 words
The process of claim 1, wherein the mild thermal cracking of the heavy fraction of the product prepared over the cobalt catalyst is carried out in the presence of steam.
Claim 11
Dependent Claim
52 words
The process of claim 1, wherein the mild thermal cracking is carried out at a temperature of 535°-675° C., a pressure of 1-5 bar abs., a residence time of 0.5-15 seconds and in the presence of a quantity of steam which amounts to at most 40 %w, calculated on the hydrocarbon feed.
Claim 12
Dependent Claim
44 words
The process of claim 1, wherein the mild thermal cracking is carried out at a temperature of 540°-600° C., a residence time of 2-10 seconds and in the presence of a quantity of steam which amounts to 3-20 %w, calculated on the hydrocarbon feed.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |