Method for isomerizing aliphatic diamine, method for producing diisocyanate, method for producing polyurethane, and polyurethane
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsMasayoshi UENO, Akifumi IIDA, Kentaro NAGAMATSU
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Abstract
A method for isomerizing an aliphatic diamine represented by Formula (1) below in the presence of an imine compound obtained by dehydration condensation of an aliphatic diamine represented by Formula (1) below and an aldehyde and/or a ketone; and in the presence of an alkali metal. A ratio of a total amount of the alkali metal to a total amount of the aliphatic diamine is 0.5 mol % or greater and 6.0 mol % or less, and R represents a single bond or an unsubstituted aliphatic or alicyclic alkylene group having 1 to 8 carbon atoms, and n represents an integer from 0 to 5.
Claims15
A method for isomerizing an aliphatic diamine, the method comprising
- isomerizing an aliphatic diamine represented by Formula (1) in the presence of:
- an imine compound obtained by dehydration condensation of an aliphatic diamine represented by Formula (1) and an aldehyde and/or a ketone;
- and
- at least one selected from the group consisting of an alkali metal, an alkali metal-containing compound, an alkaline earth metal, and an alkaline earth metal-containing compound,
- wherein a ratio of a total amount of the alkali metal, the alkali metal-containing compound, the alkaline earth metal, and the alkaline earth metal-containing compound used to a total amount of the aliphatic diamine used is 0.5 mol % or greater and 6.0 mol % or less,
- wherein R represents a single bond or an unsubstituted aliphatic or alicyclic alkylene group having 1 to 8 carbon atoms, and n represents an integer from 0 to 5.
Dependencies are inferred from the claim text.