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US 11,472,765 B2Granted
Production method for 1,4-cyclohexanedicarboxylic acid derivative, 1,4-dicyanocyclohexane and 1,4-bis(aminomethyl)cyclohexane
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsAkifumi Iida, Aoi Yamazoe
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Abstract
A production method for producing a 1,4-cyclohexanedicarboxylic acid derivative, involves subjecting an aqueous ammonia solution of 1,4-cyclohexanedicarboxylic acid to heat concentration, thereby precipitating a 1,4-cyclohexanedicarboxylic acid derivative as a crystal.
Claims17
A method for producing a 1,4-cyclohexanedicarboxylic acid derivative, the method comprising:
- heat concentrating an aqueous ammonia solution comprising 1,4-cyclohexanedicarboxylic acid, thereby precipitating a 1,4-cyclohexanedicarboxylic acid derivative as a crystal,
- wherein the 1,4-cyclohexanedicarboxylic acid derivative is an ammonium salt of 1,4-cyclohexanedicarboxylic acid and/or 4-carboxamidocyclohexane-1-carboxylic acid, and
- a content of trans isomer of the 1,4-cyclohexanedicarboxylic acid derivative is 70.0 to 99.9 wt. %.
Dependencies are inferred from the claim text.