US4111832A
Expired / Lapsed
US
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Process for regenerating spent vanadium oxide containing oxidation catalysts
Assignee: Bayer AG
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Filing: 1976-11-22
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Granted: 1978-09-05
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Expires: 1996-11-22
Abstract
Abstract A process for regenerating a deactivated oxidation catalyst, especially one containing vanadium oxide, wherein the deactivated catalyst is treated with an aqueous solution of ammonia and/or an amine at an elevated temperature so as to dissolve at least a portion of the catalyst and the resultant solution or suspension is treated in a known manner to obtain the reactivated catalyst.
Inventors
- 👤 Klaus Rohbock
- 👤 Rudolf Wiemers
- 👤 Peter Woditsch
- 👤 Reinhard Thiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/90; B01J23/92; C07C51/31; C07C51/313; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A process for regenerating a deactivated V 2 O 5 : P 2 O 5 : CuO hydrocarbon oxidation catalyst which comprises contacting the deactivated oxidation catalyst with a solution consisting essentially of an aqueous solution of ammonia and/or an amine at a temperature of from 100° to 250° C., whereby to dissolve at least partially the catalytically effective constituents of of the catalyst, drying the resultant solution or suspension and calcining the same at temperatures between 300° and 650° C. in the presence of air, grinding the resultant solid and thereafter molding the same into a final catalyst form.
Claim 2
Dependent Claim
100 words
A process for regenerating a deactivated V 2 O 5 : P 2 O 5 : CuO hydrocarbon oxidation catalyst which comprises contacting the deactivated oxidation catalyst with a solution consisting essentially of an aqueous solution of ammonia and/or an amine at a temperature of from 100° to 250° C., whereby to dissolve at least partially the catalytically effective constituents of of the catalyst, drying the resultant solution or suspension and calcining the same at temperatures between 300° and 650° C. in the presence of air, grinding the resultant solid and thereafter molding the same into a final catalyst form.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein an aqueous ammonia solution is employed and the ammonia solution contains from 5 to 32 percent by weight of ammonia.
Claim 4
Dependent Claim
27 words
A process according to claim 2 in which an aqueous ammonia solution is employed and the ammonia solution contains 15 to 30 percent by weight of ammonia.
Claim 5
Dependent Claim
15 words
A process according to claim 1 wherein the temperature is from 130° to 180° C.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the process is carried out at a pressure up to 300 bars.
Claim 7
Dependent Claim
20 words
A process according to claim 5 wherein the process is carried out at a pressure of 5 to 50 bars.
Claim 8
Dependent Claim
41 words
A process according to claim 1 wherein an amine is used which amine has the formula ##STR2## wherein R 1 , R 2 and R 3 are independently selected from the group consisting of hydrogen, aliphatic, cycloaliphatic, araliphatic and aromatic radicals.
Claim 9
Dependent Claim
82 words
A process according to claim 7 wherein the aliphatic radical is a straight chain or branched alkyl radical having up to 10 carbon atoms, the cycloaliphatic radical is one having up to 10 carbon atoms, the araliphatic radical is one having up to 10 carbon atoms in which the aryl portion is phenyl and the aliphatic portion is alkyl having up to 4 carbon atoms in the chain and the aromatic radical is one having betweemn 6 and 10 ring carbon atoms.
Claim 10
Dependent Claim
43 words
A process according to claim 1 wherein an amine is employed said amine being selected from the group consisting of monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monopropylamine, dipropylamine, tripropylamine, monobutylamine, dibutylamine, tributylamine, monooctylamine, dioctylamine, trioctylamine, tert.-butylamine, benzylamine, aniline, diphenylamine, N,N,-dimethylaniline, pyridine and piperidine.
Claim 11
Dependent Claim
14 words
A process according to claim 1 wherein an aqueous solution of dimethylamine is employed.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |