MANUFACTURING PROCESS OF TEREPHTHALIC ACID AND ITS ISOMERS

Prepn. is of terephthalic acid (IA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate by hydrolysis in a countercurrent reactor with over 99% conversion and crystallisation to a solid prod.. The that (a) the sum (S + W) of stripping steam (S) and reaction water (W) is from L to 2L (L =...

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Bibliographische Detailangaben
Hauptverfasser: JOSTMANN THOMAS, KORTE HERMANN-JOSEF, SCHWARZ CHRISTOPH, SCHOENGEN ANTON
Format: Patent
Sprache:eng
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Zusammenfassung:Prepn. is of terephthalic acid (IA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate by hydrolysis in a countercurrent reactor with over 99% conversion and crystallisation to a solid prod.. The that (a) the sum (S + W) of stripping steam (S) and reaction water (W) is from L to 2L (L = the amt. of water needed to keep most of the TA produced in the reaction and present in the sump in soln.; and (b) the TA produced is crystallised in a crystallisation free from washing steps.