Claims
- 1. A process for the preparation of 3-methylpiperidine which comprises: hydrogenating 2-methylglutarodinitrile in the liquid phase at from 180.degree. to 300.degree. C. and under a pressure of 150 to 320 bar in the presence of a molded metallic iron catalyst which is obtained from anisometric iron oxide particles by reduction with hydrogen at 500.degree. C., such molded iron catalyst having a content of 1 to 5% by weight of graphite and an indentation hardness of .gtoreq.300 kp/cm.sup.2, and concomitant use of from 1 to 15 parts by volume of crude hydrogenation mixture per part by volume of 2-methylglutarodnitrile, such crude hydrogenation mixture containing principally 3-methylpiperidine together with small amounts of 2-methyl-1,5-diaminopentane, 2-methylglutarodinitrile, ammonia and unspecified amines.
- 2. The process of claim 1, wherein the metallic iron particles exhibit a degree of reduction of .gtoreq.95%.
- 3. The process of claim 1, wherein the molded metallic iron catalyst has an indentation hardness of from 600 to 800 kp/cm.sup.2.
- 4. The process of claim 1, wherein anisometric .gamma.-iron(III)-oxidenhydroxide is used as starting material for the catalyst.
- 5. The process of claim 1, wherein a temperature of 200.degree. to 260.degree. C. is maintained.
- 6. The process of claim 1, wherein from 6 to 10 parts by volume of crude hydrogenation mixture are concomitantly used per part by volume of 2-methylglutarodinitrile.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3329692 |
Aug 1983 |
DEX |
|
Parent Case Info
This application is a continuation of application Ser. No. b 641,858, filed on Aug. 17, 1984, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1486890 |
Sep 1977 |
GBX |
1488335 |
Oct 1977 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
641858 |
Aug 1984 |
|