2,5-Dihydroxyterephthalic acid → 4,6-Diamino-1,3-benzenediol 2,5-dihydroxyterepthalic acid

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Reaction Steps

7 Parts by weight of 4,6-diamino-1,3-benzenediol dihydrochloride was dissolved in 33 parts by weight of water deaerated with nitrogen. 6.180 Parts by weight of 2,5-dihydroxyterephthalic acid was dissolved in 64 parts by weight of a 1M sodium hydroxide aqueous solution, followed by deaeration with nitrogen. The 4,6-diamino-1,3-benzenediol dihydrochloride aqueous solution was dropwise added to the 2,5-dihydroxyterephthalic acid disodium salt aqueous solution over 10 minutes to form a white precipitate of 4,6-diamino-1,3-benzenediol/2,5-dihydroxyterepthalic acid salt. In this case, the reaction temperature was maintained at 90° C. The resultant salt was recovered by filtering and dispersed in, and mixed with, 3,000 parts by weight of water deaerated with nitrogen, followed by re-filtering. Procedures of the above dispersing/mixing and filtering were repeated 3 times.

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