abstract |
(57) [Abstract] [Purpose] 2,6-dihydroxybenzoic acid can be easily and efficiently separated from a mixture of 2,6-dihydroxybenzoic acid and 2,4-dihydroxybenzoic acid to industrially favor 2, 6-Dihydroxybenzoic acid is produced. [Structure] An aqueous solution containing a mixture of 2,6-dihydroxybenzoic acid and 2,4-dihydroxybenzoic acid and having a pH of 4 or more is heat-treated to decompose 2,4-dihydroxybenzoic acid. |