Gas chromatographic analysis of aromatic carboxylic acids in the presence of C1-C22 fatty acids and C2-C16 dicarboxylic acids esterified in aqueous solutions as the n-propyl esters

M. Morvai, I. Molnár-Perl

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Abstract

The direct esterification and gas chromatographic analysis of aromatic carboxylic acids as n-propyl esters is described. Derivatization is performed in aqueous solution with n-propanol in the presence of sulfuric acid. The n-propyl esters of benzoic, phthalic, trimellitic and pyromellitic acids permit their gas chromatographic separation from each other and from fatty acids and aliphatic dicarboxylic acids. At mode ratios of [H2O]/[n-PrOH]≤0.03 the water present does not interfere with the esterification reaction. At mole ratios above 0.03 anhydrous sodium sulfate is used for binding the water, at mole ratios of [Na2SO4anh.]/[H2O]=0.51-1.52 and of [H2SO4]/[Na2SO4anh.]=0.43-1.28, respectively.

Original languageEnglish
Pages (from-to)925-928
Number of pages4
JournalChromatographia
Volume23
Issue number12
DOIs
Publication statusPublished - Dec 1 1987

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Keywords

  • Esterification in aqueous solution
  • Gas chromatography
  • n-Propyl esters of aromatic polycarboxylic acids

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry
  • Organic Chemistry

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