Process for production of purified terephthalic acid

A process for the production of purified terephthalic acid (PTA) from crude terephthalic acid (CTA) comprising mixing the CTA with an aqueous medium to form an aqueous CTA mixture, heating the mixture to dissolve substantially all of the CTA in the aqueous medium by introducing into the aqueous mixt...

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Bibliographic Details
Main Authors D. PARKER, J. A. TURNER, E. HINDMARSH
Format Patent
LanguageEnglish
Published 29.07.1998
Edition6
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
BLASTING
CHEMISTRY
HEAT EXCHANGE IN GENERAL
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACTWITHOUT CHEMICAL INTERACTION
HEATING
LIGHTING
MECHANICAL ENGINEERING
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
WEAPONS
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Summary:A process for the production of purified terephthalic acid (PTA) from crude terephthalic acid (CTA) comprising mixing the CTA with an aqueous medium to form an aqueous CTA mixture, heating the mixture to dissolve substantially all of the CTA in the aqueous medium by introducing into the aqueous mixture vapour having a temperature greater than that of said mixture and then chemically reducing impurities in the aqueous solution of CTA followed by recovery of PTA by a crystallisation process. The vapour is typically steam derived from the crystallisation process and may be introduced into the aqueous CTA mixture by means of an injection device (30) (Figures 2 and 3).
Bibliography:Application Number: CN19931008224