Patent US3725495A successfully refreshed from Google Patents.
US3725495A
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Catalytic steam cracking of hydrocarbons and catalysts therefor
Assignee: Fluor Corp
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Filing: 1970-12-17
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Granted: 1973-04-03
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Expires: 1990-12-17
Abstract
Abstract Steam cracking of saturated hydrocarbons to form unsaturated hydrocarbons, such as ethylene, propylene, butylenes, butadiene, and aromatics, is carried out in the presence of a catalyst comprising a major proportion of oxides of zirconium or hafnium associated with active alumina together with oxides of chromium, manganese or iron and promoted with compounds of alkali metals and alkaline earth metals. High conversion efficiences are achieved at high space velocities and without carbon deposition.
Inventors
- 👤 J Wrisberg
- 👤 K Andersen
- 👤 E Mogensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:04
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/16; C; C07; C07C; C07C4/00; C07C4/02; C07C4/06; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/16; C07C2523/24; C07C2523/26; C07C2523/32; C07C2523/34; C07C2523/70; C07C2523/74; C07C2523/745; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
19 words
A process according to claim 1, wherein the reaction is carried out at a temperature in the range 200*-900*C.
Claim 2
Dependent Claim
23 words
A process according to claim 2, wherein the reaction is carried out at a pressure of 1-15 atm.abs. measured at the reactor outlet.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the reaction is carried out at a temperature in the range 500*-850*C.
Claim 4
Dependent Claim
21 words
A process according to claim 1, wherein the feedstock consists entirely of a saturated hydrocarbon or a mixture of saturated hydrocarbons.
Claim 5
Dependent Claim
23 words
A process according to claim 1, wherein the feedstock comprises a major proportion of saturated hydrocarbons and a minor proportion of unsaturated hydrocarbons.
Claim 6
Dependent Claim
17 words
A process according to claim 1, wherein the reaction is carried out in the presence of sulfur.
Claim 7
Dependent Claim
29 words
A process according to claim 7, wherein the sulfur is added to the feedstock in the form of free sulfur, hydrogen sulfide, carbon disulfide or an organic sulfur compound.
Claim 8
Dependent Claim
26 words
A process according to claim 7, wherein sufficient steam is added to give a weight ratio of steam to hydrocarbon feedstock in the reactor of 0.1-1.0.
Claim 9
Dependent Claim
26 words
A process according to claim 1, wherein sufficient steam is added to give a weight ratio of steam to hydrocarbon feedstock in the reactor of 0.01-10.
Claim 10
Dependent Claim
16 words
A process according to claim 10, wherein the ratio of steam to hydrocarbon feedstock is 0.1-1.0.
Claim 11
Dependent Claim
95 words
A process for the manufacture of unsaturated hydrocarbons by a gaseous catalytic reaction wherein a feedstock substantially comprising saturated hydrocarbons is contacted at a temperature in the range 500*-850*C and a pressure in the range 1-15 atm.abs. measured at the reactor outlet in the preseNce of added steam with a catalyst comprising 50-80 wt.% zirconium and/or hafnium oxide, together with 5-30 wt.% active alumina, as well as 5-40 wt.% of at least one oxide of chromium manganese and/or iron and 0.3-7.0 wt.% of at least one compound of an alkali metal and/or alkaline earth metal.
Claim 12
Dependent Claim
21 words
A process according to claim 12, wherein the feedstock consists entirely of a saturated hydrocarbon or a mixture of saturated hydrocarbons.
Claim 13
Dependent Claim
23 words
A process according to claim 12, wherein the feedstock comprises a major proportion of saturated hydrocarbons and a minor proportion of unsaturated hydrocarbons.
Claim 14
Dependent Claim
17 words
A process according to claim 12, wherein the reaction is carried out in the presence of sulfur.
Claim 15
Dependent Claim
29 words
A process according to claim 15, wherein the sulfur is added to the feedstock in the form of free sulfur, hydrogen sulfide, carbon disulfide or an organic sulfur compound.
Claim 16
Dependent Claim
26 words
A process according to claim 15, wherein sufficient steam is added to give a weight ratio of steam to hydrocarbon feedstock in the reactor of 0.1-1.0.
Claim 17
Dependent Claim
26 words
A process according to claim 12, wherein sufficient steam is added to give a weight ratio of steam to hydrocarbon feedstock in the reactor of 0.01-10.
Claim 18
Dependent Claim
16 words
A process according to claim 18, wherein the ratio of steam to hydrocarbon feedstock is 0.1-1.0.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |