PROCESS FOR THE OXIDATIVE PURIFICATION OF TEREPHTHALIC ACID

摘要

DISCLOSED IS A PROCESS TO PRODUCE A PURIFIED CARBOXYLIC ACID SLURRY (190). THE PROCESS COMPRISES REMOVING IMPURITIES FROM A CRYSTALLIZED PRODUCT (160) IN A SOLID LIQUID DISPLACEMENT ZONE (180) TO FROM THE PURIFIED CARBOXYLIC ACID SLURRY (190). THE PURIFIED CARBOXYLIC ACID SLURRY (190) IS FURTHER COOLED IN A COOLING ZONE (200) AND SUBSEQUENTLY FILTERED AND DRIED IN A FILTRATION AND DRYING ZONE. THE PROCESS PRODUCES PURIFIED CARBOXYLIC ACID PRODUCT (230) HAVING GOOD COLOR AND LOW IMPURITY LEVELS WITHOUT THE USE OF PURIFICATION STEPS LIKE HYDROGENATION OR FILTRATE PURGE.