# US 4,400,538 A · Fixed bed catalyst for MNB and DNT hydrogenation

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- Number: US 4,400,538 A
- Document ID: US4400538A
- Status: Granted
- Kind: A
- Application number: 06/272,629
- Filed: 1981-06-11
- Granted: 1983-08-23
- Earliest claimed: 1981-06-11
- Assignees: Mobay Chemical Corporation
- Inventors: David H. Chadwick; Thomas E. Boyd
- Web page: https://patentgrep.com/patent/US4400538A

## CPC

- C07C 209/36: by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings {in presence of hydrogen-containing gases and a catalyst}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The instant invention is directed to a process for the production of an aromatic amino compound of the formula: ##STR1## wherein R is an alkyl substituent of from 1 to about 18 carbon atoms, m is an integer of from 1 to 3, and n is an integer of from 0 to 5, comprising subjecting a nitro compound of the formula: ##STR2## wherein R, m, and n are as defined above, to gaseous hydrogen in the presence of a catalyst, the improvement wherein said catalyst is an activated noble metal in the form of a screen or other coherent body.

## Claims

### Claim 1

In a process for the production of an aromatic amino compound of the formula: ##STR6## wherein R is an alkyl substituent of from 1 to about 18 carbon atoms,
m is an integer of from 1 to 3, and
n is an integer of from 0 to 5,
comprising subjecting a nitro compound of the formula; ##STR7## wherein R, m, and n are as defined above, to gaseous hydrogen in the presence of a catalyst, the improvement wherein said catalyst is an activated noble metal in the form of a screen.

### Claim 2 (depends on 1)

The process of claim 1, wherein said aromatic amino compound is aniline and said nitro compound is mononitrobenzene.

### Claim 3 (depends on 1)

The process of claim 1, wherein said aromatic amino compound is toluenediamine and said nitro compound is dinitrotoluene.

### Claim 4 (depends on 1)

The process of claim 1 wherein said catalyst is an activated platinum screen.