Method for producing 1,2-diamino-3-methylcyclohexane and/or 1,2-diamino-4-methylcyclohexane
AssigneeBASF SE
InventorsFriederike Osswald, Karl Heinz Brauch, Arnd Bottcher, Jochem Henkelmann, Frederik van Laar, Till Gerlach
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Abstract
A process for preparing 1,2-diamino-3-methylcyclohexane and/or 1,2-diamino-4-methylcyclohexane by reacting 2,3- and/or 3,4-diaminotoluene with hydrogen at elevated pressure and elevated temperature in the presence of a heterogeneous rhodium catalyst, wherein a mixture comprising 2,3- and/or 3,4-diaminotoluene, a dialkyl ether and/or alicyclic ether as a solvent and ammonia is initially charged in an autoclave in the presence of the catalyst and subsequently hydrogenated while supplying hydrogen.
Claims15
A process for preparing 1,2-diamino-3-methylcyclohexane and/or 1,2-diamino-4-methylcyclohexane, comprising the steps of
- (a) charging an autoclave with a mixture comprising 2,3- and/or 3,4-diaminotoluene, a dialkyl ether and/or alicyclic ether as a solvent, ammonia, and a heterogeneous rhodium catalyst;
- and
- (b) hydrogenating said 2,3- and/or 3,4-diaminotoluene by supplying hydrogen to said autoclave at elevated pressure and elevated temperature to form 1,2-diamino-3-methylcyclohexane and/or 1,2-diamino-4-methylcyclohexane;
- wherein said process is performed batchwise.
Dependencies are inferred from the claim text.