PROCESS FOR THE PREPARATION OF TEREPHTHALIC ACID AND ITS ISOMERS

PROCESS FOR THE PREPARATION OF TEREPHTHALIC ACID AND ITS ISOMERS

The invention relates to a process for the preparation of terephthalic acid (TA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate product by hydrolysis in a countercurrent reactor at a conversion of greater than 99 % and crystallization to give the solid product, which is characterized...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KORTE, HERMANN-JOSEF, JOSTMANN, THOMAS, SCHWARZ, CHRISTOPH, SCHOENGEN, ANTON
Format: Patent
Sprache:eng ; fre
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:The invention relates to a process for the preparation of terephthalic acid (TA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate product by hydrolysis in a countercurrent reactor at a conversion of greater than 99 % and crystallization to give the solid product, which is characterized in that the sum of the stripping steam (S) and reaction water (W) satisfies the relationship L wherein (L) represents the amount of water necessary to keep the terephthalic acid (TA) produced largely in solution during the reaction and in the bottom of the reactor, and the terephthalic acid produced is crystallized in a crystallization which is free from washing stages.