FIELD: chemistry.
SUBSTANCE: invention relates to improved method of obtaining terephthalic acid, including a) interaction of 2,5-furanedicarboxylic acid, 2,5-furane dicarboxilate or their mixture with ethylene in presence of solvent with formation of bicyclic ether at temperature in the interval from 100°C to 250°C and pressure in the interval from approximately 10 lb/sq.inch (about 68.95 kPa) to 2000 lb/sq.inch (about 13.79 MPa) and b) dehydration of bicyclic ether.
EFFECT: method ensures effective obtaining terephthalic acid with reduced amount of admixtures, coloured admixtures and carbon oxides, which are formed in industry in case of liquid-phase oxidation of methyl-substituted benzoles, or without said admixtures at all.
16 cl, 1 tbl, 2 ex
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