Claims
- 1. A process for preparing a benzaldehyde of the formula ##STR4## wherein R represents a methoxy or tert.butyl group, which process comprises oxidizing a compound of the formula ##STR5## wherein R is defined as above, in the presence of oxygen or oxygen-containing gases and a uranium-free metal oxide catalyst consisting essentially of the composition
- MoMe.sub.a.sup.1 Me.sub.b.sup.2 O.sub.x
- wherein Me.sup.1 stands for copper or silver and Me.sup.2 stands for one or more of the elements iron, cerium, zinc, tin, and zirconium, a denotes 0.2 to 1.0, b denotes 0 to 0.5 and x denotes the number of oxygen atoms required to satisfy the valencies of the other elements present, at temperatures of 350.degree. to 600.degree. C.
- 2. A process according to claim 1, wherein the catalyst additionally contains talc or silicon dioxide having a large specific surface.
- 3. A process according to claim 1, wherein Me.sup.1 stands for copper.
- 4. A process according to claim 1, wherein Me.sup.2 stands for tin.
- 5. A process according to claim 1, wherein R represents tert.butyl.
- 6. A process according to claim 1, wherein the reaction is carried out at a temperature of about 400.degree. C. to about 500.degree. C.
- 7. A process according to claim 1, wherein the reaction is carried out at a temperature of about 430.degree. C. to about 470.degree. C.
- 8. A process according to claim 1, wherein the reaction is carried out at atmospheric pressure.
- 9. A process according to claim 1, wherein there is used a catalyst which is fixed on an inert carrier material.
- 10. A process according to claim 1, wherein the contact time amounts to approximately 0.1 to approximately 10 seconds.
- 11. A process according to claim 1, wherein the reaction is carried out in an atmosphere comprising air to which optionally there may be added one or more of nitrogen and exhaust gases from the reactor.
- 12. A process for preparing a benzaldehyde of the formula ##STR6## wherein R represents a methoxy or tert.butyl group, which process comprises oxidizing at temperatures of 350.degree. to 600.degree. C. a compound of the formula ##STR7## wherein R is defined as above, in the presence of oxygen or oxygen-containing gases and a metal oxide catalyst of the composition
- MoMe.sub.a.sup.1 Me.sub.b.sup.2 O.sub.x
- wherein Me.sup.1 stands for copper and Me.sup.2 stands for tin, a denotes 0.2 to 1.0, b denotes 0 to 0.5 and x denotes the number of oxygen atoms required to satisfy the valencies of the other elements present.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2597 |
Feb 1982 |
CHX |
|
1029 |
Feb 1983 |
CHX |
|
Parent Case Info
This is a continuation of application Ser. No. 485,547 filed Apr. 15, 1983 abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
1636854 |
Craver |
Jul 1927 |
|
3423466 |
Guyer et al. |
Jan 1969 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
0009239 |
Apr 1980 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
485547 |
Apr 1983 |
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