SOLID TEREPHTHALIC ACID COMPOSITION Russian patent published in 2015 - IPC C07C63/26 C07C63/06 C07C51/21 

FIELD: chemistry.

SUBSTANCE: invention relates to a solid terephthalic acid composition intended for producing pure terephthalic acid without using catalytic hydrogenation. The composition contains terephthalic acid, para-toluic acid and 4-carboxybenzaldehyde and has 4-carboxybenzaldehyde content of less than 100 ppmw and para-toluic acid content of more than 19600 ppmw. The composition is obtained using a solvent which includes a carboxylic acid with 1-7 carbon atoms and dialkylimidazole ionic liquid with weight ratio of liquid to acid ranging from about 1:10 to about 10:1.

EFFECT: obtaining pure terephthalic acid without using catalytic hydrogenation.

7 cl, 1 tbl, 9 ex