A PROCESS FOR THE PRODUCTION OF PURIFIED TEREPHTHALIC ACID (PTA) FROM CRUDE TEREPHTHALIC ACID (CTA)

摘要

An improved process for the production of purified terephthalic acid (PTA) 5   from crude terephthalic acid (CTA) comprising mixing the CTA with an aqueous medium to form an aqueous CTA slurry, and heating the slurry to dissolve substantially all of the CTA in the aqueous medium by means of a hot liquid stream being introduced into the CTA slurry stream wherein the vapor pressure of the hot liquid stream is lower than the pressure of the CTA slurry.