US4072629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of alkene disproportionation catalyst
Assignee: Shell USA Inc
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Filing: 1976-10-26
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Granted: 1978-02-07
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Expires: 1996-10-26
Abstract
Abstract Alkene disproportionation catalyst which has become deactivated by the deposition of organic material is regenerated by first contacting the catalyst with low molecular weight alkenes at an elevated temperature to partially remove a portion of the deposited organic material and then contacting the catalyst with an oxygen containing gas at temperatures below 650° C. in order to remove substantially all of the remaining deposited organic material.
Inventors
- 👤 Frank J. Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; B01J23/92; B01J37/00; B01J37/12; B01J37/14; C; C07; C07C; C07C6/00; C07C6/02; C07C6/04; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/70; C07C2523/76; C07C2523/84; C07C2523/85; C07C2523/88; C07C2523/882; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A process for the regeneration of solid alkene disproportionation catalysts selected from the group consisting of oxides of molybdenum, cobalt, tungsten, rhenium and mixtures thereof supported on alumina or silica which have been used to disproportionate alkene feeds containing at least thirty percent of the alkenes in said feed with carbon numbers of twelve or more and which catalysts have been deactivated by the deposition of organic material which process comprises first contacting the deactivated catalyst with a regenerating alkene or mixtures of alkenes having from 2 to about 5 carbon atoms per molecule at a temperature of from about 50° to about 350° C and then contacting the catalyst with an oxygen-containing gas at a temperature between about 100° and 650° C.
Claim 2
Dependent Claim
123 words
A process for the regeneration of solid alkene disproportionation catalysts selected from the group consisting of oxides of molybdenum, cobalt, tungsten, rhenium and mixtures thereof supported on alumina or silica which have been used to disproportionate alkene feeds containing at least thirty percent of the alkenes in said feed with carbon numbers of twelve or more and which catalysts have been deactivated by the deposition of organic material which process comprises first contacting the deactivated catalyst with a regenerating alkene or mixtures of alkenes having from 2 to about 5 carbon atoms per molecule at a temperature of from about 50° to about 350° C and then contacting the catalyst with an oxygen-containing gas at a temperature between about 100° and 650° C.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the regenerating alkene is selected from the group consisting of propylene, 2-butene and mixtures thereof.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the catalysts comprise oxides of molybdenum, cobalt, tungsten, rhenium and mixtures thereof supported on gamma-alumina.
Claim 5
Dependent Claim
40 words
The process of claim 1 wherein the catalyst is additionally contacted after contact with the regenerating alkenes and prior to contact with the oxygen-containing gas with an inert gas at a temperature of from about 250° to about 650° C.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the inert gas is nitrogen.
Claim 7
Dependent Claim
21 words
The process of claim 5 wherein the regenerating alkene is selected from the group consisting of propylene, 2-butene and mixtures thereof.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein the catalysts comprise oxides of molybdenum, cobalt, tungsten, rhenium and mixtures thereof supported on gamma-alumina.
References Cited (Backward Citations)
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |