FIELD: industrial organic synthesis. SUBSTANCE: invention relates to obtaining polymerization-suitable dicarboxylic acid crystallization products from solution containing at least one dicarboxylic acid by way of adding to solution, before or during crystallization, at least one anionic polyelectrolyte with molecular weight at least 2000, preferably between 100000 and 500000, in amounts from 0.01 to 200 ppm, preferably 0.1 to 150 ppm. EFFECT: improved looseness and homogeneity. 6 cl, 2 ex
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