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Co-oxidation of p-xylene and p-toluic acid to terephthalic acid in water solvent: Kinetics and additive effects

Paper ID Volume ID Publish Year Pages File Format Full-Text
42927 45947 2009 5 PDF Available
Title
Co-oxidation of p-xylene and p-toluic acid to terephthalic acid in water solvent: Kinetics and additive effects
Abstract

Co-oxidation of p-xylene (PX) and p-toluic acid (p-TA) to terephthalic acid (TA) in water with Mn acetate catalyst has been studied. Mn acetate showed better catalytic activity than Co acetate and no synergism was observed between two catalysts. During the reaction, PX was transformed to p-TA while p-TA was converted to TA by a radical reaction. In the co-oxidation, radicals generated from facile PX-to-p-TA conversion would assist more difficult p-TA to TA conversion. Addition of CO2 in the oxygen promoted the TA formation and suppressed the CO2 formation from the combustion of reactants. Additional transition metals such as Ni and Ti also promoted the catalytic activity of Mn catalyst. Furthermore, a synergism was observed between added CO2 and the added transition metal. Finally, the yield of terephthalic acid reached about 95% with Mn + (Ti, Ni or Cr) catalyst system and CO2 addition.

Graphical abstractIn co-oxidation of p-xylene (PX) and p-toluic acid (p-TA) to terephthalic acid (TA) in water with Mn acetate catalyst, PX was transformed to p-TA while p-TA was converted to TA. The radicals generated from facile PX-to-p-TA conversion would assist more difficult p-TA to TA conversion. The promotional effect of CO2 and co-catalysts was demonstrated.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Terephthalic acid; Co-oxidation; Water solvent; Manganese acetate; CO2 effect
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Co-oxidation of p-xylene and p-toluic acid to terephthalic acid in water solvent: Kinetics and additive effects
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 358, Issue 1, 30 April 2009, Pages 54–58
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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