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US 2020/0223784 A1Published application
Process for catalytic hydrogenation of halonitroaromatics
AssigneeMonsanto Technology LLC
InventorsJohn H. Ahn, Kam-To Wan
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Abstract
The present invention generally relates to processes for the catalytic hydrogenation of halonitroaromatics. In particular, the present invention includes processes for the catalytic hydrogenation of halonitroaromatics such as 2,5-dicloronitrobenzene to 2,5-dichloroaniline over a platinum-containing catalyst. The present invention also relates to processes for producing 3,6-dichloro-2-methoxybenzoic acid.
Claims21
1-63. (canceled)
A process for producing 2,5-dichloroaniline, the process comprising:
- feeding hydrogen and a feed mixture comprising 2,5-dichloronitrobenzene to a hydrogenation zone;
- and
- reacting the 2,5-dichloronitrobenzene with hydrogen in the presence of a heterogeneous hydrogenation catalyst comprising platinum on a support to produce a reaction product comprising 2,5-dichloroaniline, wherein the hydrogenation catalyst has been calcined at a temperature of at least about 500° C.
A process for preparing a haloaminoaromatic compound, the process comprising:
- feeding hydrogen and a feed mixture comprising a halonitroaromatic compound to a hydrogenation zone;
- and
- reacting the halonitroaromatic compound with hydrogen in the presence of a hydrogenation catalyst comprising platinum on a support to produce a reaction product comprising the haloaminoaromatic compound, wherein the hydrogenation catalyst has been calcined at a temperature of at least about 500° C.
Dependencies are inferred from the claim text.