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process for purification of di - (hydroxyalkyl) - terephthalaten, particularly bis - (amp; beta; - n-hexadecyl-n-2-hydroxyethylammonio) terephthalate
process for purification of di - (hydroxyalkyl) - terephthalaten, particularly bis - (amp; beta; - n-hexadecyl-n-2-hydroxyethylammonio) terephthalate