Terephthalic acid synthesis at higher concentrations in high-temperature liquid water. 1. effect of oxygen feed method

Mitsumasa Osada, Phillip E. Savage

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We conducted terephthalic acid (IPA) synthesis from p-xylene in high-temperature liquid water (HTW) at 300°C. The p-xylene concentration at the reaction condition was 0.2 mol L -1, which is the highest to date in research that achieved at least 80 mol % yields of TPA in HTW. Pure oxygen gas was the oxidant. Increasing the MnBr 2 catalyst concentration increased the rate of TPA formation only slightly. In contrast, whether oxygen was fed in small, quick, discrete bursts, or fed continuously significantly affected the p-xylene conversion and the TPA selectivity. Adding oxygen in quick bursts and small increments led to high selectivities (>90 mol %) of TPA. Continuous addition of oxygen failed to do so. In addition to identifying the sensitivity of this synthesis to the oxygen feed method, these results also demonstrate the feasibility of HTW for TPA synthesis at higher concentrations, and hence high TPA production per unit reactor volume.

Original languageEnglish (US)
Pages (from-to)710-716
Number of pages7
JournalAIChE Journal
Volume55
Issue number3
DOIs
StatePublished - Mar 1 2009

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Oxygen
Xylene
Temperature
Acids
Water
Liquids
Oxidants
Gases
terephthalic acid
Catalysts
Research
4-xylene

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Biotechnology
  • Environmental Engineering

Cite this

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abstract = "We conducted terephthalic acid (IPA) synthesis from p-xylene in high-temperature liquid water (HTW) at 300°C. The p-xylene concentration at the reaction condition was 0.2 mol L -1, which is the highest to date in research that achieved at least 80 mol {\%} yields of TPA in HTW. Pure oxygen gas was the oxidant. Increasing the MnBr 2 catalyst concentration increased the rate of TPA formation only slightly. In contrast, whether oxygen was fed in small, quick, discrete bursts, or fed continuously significantly affected the p-xylene conversion and the TPA selectivity. Adding oxygen in quick bursts and small increments led to high selectivities (>90 mol {\%}) of TPA. Continuous addition of oxygen failed to do so. In addition to identifying the sensitivity of this synthesis to the oxygen feed method, these results also demonstrate the feasibility of HTW for TPA synthesis at higher concentrations, and hence high TPA production per unit reactor volume.",
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Terephthalic acid synthesis at higher concentrations in high-temperature liquid water. 1. effect of oxygen feed method. / Osada, Mitsumasa; Savage, Phillip E.

In: AIChE Journal, Vol. 55, No. 3, 01.03.2009, p. 710-716.

Research output: Contribution to journalArticle

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