界面活性剤の標準試料に関する研究-1-Nekal型界面活性剤の親油性基分析

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Lipophilic group analysis of a Nekal-type anionic surfactant was investigated. Highly purified potassium 1, 4-diisopropyl-6-naphthalenesulfonate (KDNS) (purity : >99mol%), prepared as a sample, was desulfonated with concentrated phosphoric acid, or fused with solid alkali hydroxides, and their reaction products were undertaken to GLC analysis.<BR>As a result, the desulfonation with concentrated phosphoric acid was recognized unsuitable for the lipophilic group analysis of such Nekal-type surfactants because of various side reaction products. On the contrary, the alkali fusion method with potassium hydroxide, carried out in a nickel crucible under nitrogen for 1h at 270280°C, produced only 1, 4-diisopropyl-6-naphthol from KDNS in good yield, as a reaction product, and moreover no side reaction products were found by GLC.<BR>Consequently, it was appreciated that the present method connected with GLC was adoptable for the lipophilic group analysis of the Nekal-type surfactants.
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