Abstract
Telephthalic acid crystals grown by vapor deposition at 160–190 °C and atmospheric pressure assume respectively polygonal, branched and unbranched-dendritic and columnar habits depending on the conditions of the experiments. Preliminary experiments. Preliminary experiments on terephthalic acid purification by vapor-phase recrystallization indicate that the volatile impurities, initially in the terephthalic acid crystal lattice, are preferentially entrained and their concentration (mass fraction) in the deposits is up to 80 times higher than in the source material. About 60% (mass) of the volatile impurity is removed from the crude acid after a 70 min treatment and the purification effects seem independent of the initial impurity loading.
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