The relation between the conventional analysis for quality of a commercial E-caprolactam and the gas chromatographic analysis has been studied. Impurities affecting the quality are, among others, aniline, 0-and p-toluidine, pentylacetamide, methylvalerolactam and octahydrophenazine. Correlations between the relevant impurity concentrations and the parameters defined as permanganate number, volatile basis, and ultraviolet are proposed. Color and alkalinity do not seem to have any relation with the aforementioned impurities.
SynopsisAnalysis of an industrial c-caprolactam by gas-liquid chromatography has been carried out using different stationary phases and operating conditions. The impurities in the 6-caprolactam are identified and hypotheses about their formation are presented. In some cases the presence either in cyclohexane or cyclohexanone of the possible impurity-producing compounds is shown.
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