METHOD FOR PREVENTING DISCOLORATION OF 6-HYDROXY-2-NAPHTHOIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a method for effectively preventing discoloration of 6-hydroxy-2-naphthoic acid. SOLUTION: The method for preventing discoloration of 6-hydroxy-2-naphthoic acid is a method for preventing discoloration of 6-hydroxy-2-naphthoic acid during storage and/or treatment of the crude reaction solution of 6-hydroxy-2-naphthoic acid. The crude reaction solution of 6-hydroxy-2-naphthoic acid is in an inert gas atmosphere in at least a part of a period in the storage and/or the treatment. A period in which at least the crude solution of 6-hydroxy-2-naphthoic acid is exposed to≥40°C is preferable as the period in the inert gas atmosphere. A reaction mixture obtained by reaction using Kolbe Schmitt reaction is preferable as the crude reaction solution of 6-hydroxy-2-naphthoic acid. COPYRIGHT: (C)2004,JPO&NCIPI