METHOD OF PURIFIED TEREPHTHALIC ACID PRODUCTION AND APPARATUS FOR WATER STEAM INJECTION USED IN METHOD OF PURIFIED TEREPHTHALIC ACID PRODUCTION

摘要

FIELD: production of purified terephthalic acid out of nonpurified raw terephthalic acid. SUBSTANCE: production of purified terephthalic acid out of nonpurified raw terephthalic acid provides for mixing of raw terephthalic acid with water medium and formation of raw terephthalic acid mixture with water, heating of the mixture for practically full solubility of raw terephthalic acid in water medium using steam with temperature above temperature of the mixture passing through the mixture with chemical reduction of impurities in raw terephthalic acid water solution with following raw terephthalic acid separation by crystallization. Used steam is usually water steam produced in process of crystallization and it is introduced in the mixture of raw terephthalic acid with water by apparatus for injection(30). EFFECT: improved quality of purified terephthalic acid. 2 dwg