Oxidation reaction of high molecular weight carboxylic acids in supercritical water

Fangming Jin, Takehiko Moriya, Heiji Enomoto

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Stearic acid, being a model compound of high molecular weight carboxylic acids, was oxidized in a batch reactor by changing the oxygen supply with an insufficient oxygen supply at a constant reaction time at 420 °C. On the basis of the intermediate products identified by GC/MS, NMR, and HPLC analyses and the free-radical reaction mechanism, the oxidation pathways of high molecular weight carboxylic acids in supercritical water are discussed. The reaction of carboxylic acids in supercritical water proceeds with the consecutive oxidation of higher molecular weight carboxylic acids to lower molecular weight carboxylic acids through several major pathways. The attack of the hydroxyl radical occurs not only at the carbons in α-, β-, γ-positions to a -COOH group but also at the carbons ((ω-1)-carbon and/or ω-carbon) far in the alkyl chain from a -COOH group, which may lead to the formation of dicarboxylic acids.

Original languageEnglish
Pages (from-to)3220-3231
Number of pages12
JournalEnvironmental Science and Technology
Volume37
Issue number14
DOIs
Publication statusPublished - 2003 Jul 15

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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