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US4172843A
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Conversion of synthesis gas to high octane predominantly olefinic naphtha
Assignee: Mobil Oil AS
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Filing: 1978-07-21
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Granted: 1979-10-30
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Expires: 1998-07-21
Abstract
Abstract An improved method is disclosed for converting synthesis gas to hydrocarbon mixtures wherein the syngas is contacted with a special catalyst comprising a crystalline zeolite having a silica-to-alumina ratio of greater than 200 (including zeolites containing essentially no alumina) and an (R2O+ M2/nO): SiO2 ratio of less than 1.1:1 where M is a metal other than a metal of Group IIIA, n is the valence of said metal, and R is an alkyl ammonium radical, said organosilicate being characterized by a specified x-ray diffraction pattern. In a specific embodiment of this invention, synthesis gas is contacted with a catalyst comprising an intimate mixture of said crystalline zeolite catalyst and iron-containing, Fischer-Tropsch catalyst to produce a liquid hydrocarbon product having a boiling range of less than 400 DEG F. at a 90 percent overhead and being a predominantly olefinic product, wherein the structure of the olefins is substantially branched chain with internally-positioned double bonds.
Inventors
- 👤 Francis G. Dwyer
- 👤 William E. Garwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:31
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/46; C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/043; C07C1/0435; C07C1/044; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/064; C07C2529/072
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
228 words
In the process of converting synthesis gas by contacting it at a temperature of 450°-750° F., a space velocity of 500-20,000 GHSV, and a pressure of from 50-1000 psig, with a catalyst comprising an intimate mixture of an iron-containing Fischer-Tropsch component and a volume excess of an acidic solid containing a crystalline zeolite, the improvement wherein the crystalline zeolite comprises a zeolite having a composition in its anhydrous state in terms of mole ratios of oxides as follows: (a) an Al 2 O 3 :SiO 2 ratio within the range of from 0 to less than 0.005 Al 2 O 3 to more than 1 SiO 2 and (b) an (xR 2 O+(l-x) M 2 / n O): SiO 2 ratio of less than 1.1:1 where M is sodium or sodium in combination with tin, calcium, nickel, or zinc, R is tetraalkylammonium and x is a number greater than 0 but not exceeding 1, said zeolite having the X-ray diffraction lines set forth in Table 1 or Table 2 of the specification and said contact producing an olefinic naphtha having a boiling range of less than 400° F. at 90 percent overhead with an aromatic content of less than about 20 weight percent, an olefin plus aromatic content of at least 50 weight percent, wherein the olefins have a predominantly branched chain structure and an internally-positioned double bond.
Claim 2
Dependent Claim
228 words
In the process of converting synthesis gas by contacting it at a temperature of 450°-750° F., a space velocity of 500-20,000 GHSV, and a pressure of from 50-1000 psig, with a catalyst comprising an intimate mixture of an iron-containing Fischer-Tropsch component and a volume excess of an acidic solid containing a crystalline zeolite, the improvement wherein the crystalline zeolite comprises a zeolite having a composition in its anhydrous state in terms of mole ratios of oxides as follows: (a) an Al 2 O 3 :SiO 2 ratio within the range of from 0 to less than 0.005 Al 2 O 3 to more than 1 SiO 2 and (b) an (xR 2 O+(l-x) M 2 / n O): SiO 2 ratio of less than 1.1:1 where M is sodium or sodium in combination with tin, calcium, nickel, or zinc, R is tetraalkylammonium and x is a number greater than 0 but not exceeding 1, said zeolite having the X-ray diffraction lines set forth in Table 1 or Table 2 of the specification and said contact producing an olefinic naphtha having a boiling range of less than 400° F. at 90 percent overhead with an aromatic content of less than about 20 weight percent, an olefin plus aromatic content of at least 50 weight percent, wherein the olefins have a predominantly branched chain structure and an internally-positioned double bond.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the SiO 2 :Al 2 O 3 ratio of the crystalline zeolite is greater than about 200:1.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the SiO 2 : Al 2 O 3 ratio of the crystalline zeolite is greater than about 500:1.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the SiO 2 : Al 2 O 3 ratio of the crystalline zeolite is greater than about 1300:1.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the crystalline zeolite has been exchanged with ammonium ions.
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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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |