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US 10,329,238 B2Granted
Isomerization of MDACH
AssigneeBASF SE
InventorsAndreas Weickgenannt, Sandra Kramp, Jan-Oliver Weidert, Alexander Panchenko, Artur Kozicki, Ralph Busch
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Abstract
A method for isomerizing a starting mixture comprising 2,4-diamino-1-methylcyclohexane, 2,4-MDACH for short, 2,6-diamino-1-methylcyclohexane, 2,6-MDACH for short, or mixtures thereof, wherein the isomerization is carried out in the presence of a supported catalyst with zirconium dioxide as support and ruthenium as active metal.
Claims8
An isomerization method, comprising:
- hydrogenating a composition comprising at least one of 2,4-diaminotoluene and 2,6-diaminotoluene, to obtain a starting mixture comprising at least one of 2,4-diamino-1-methylcyclohexane and 2,6-diamino-1-methylcyclohexane;
- separating the starting mixture to obtain a cis-enriched or trans-enriched mixture comprising at least one of the 2,4-diamino-1-methylcyclohexane and the 2,6-diamino-1-methylcyclohexane;
- and
- isomerizing the cis-enriched or trans-enriched mixture in the presence of a supported catalyst with zirconium dioxide as support and ruthenium as active metal, to obtain a product mixture,
- wherein the isomerizing is a cis/trans isomerization that alters the cis/trans ratio of the product mixture relative to the cis-enriched or trans-enriched mixture.
2 more elements
Dependencies are inferred from the claim text.