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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

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Summary

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.

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Authors and Affiliations

  1. Institute of Inorganic and Analytical Chemistry, L. Eötvös University, Múzeum krt. 4/B, 1088, Budapest, Hungary

    M. Morvai & I. Molnár-Perl

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  1. M. Morvai
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  2. I. Molnár-Perl
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Morvai, M., Molnár-Perl, I. 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. Chromatographia 23, 925–928 (1987). https://doi.org/10.1007/BF02261472

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  • DOI: https://doi.org/10.1007/BF02261472

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