USE OF THIN-LAYER CHROMATOGRAPHY (TLC) FOR IDENTIFICATION OF AIRCRAFT ENGINE OIL COMPONENTS.
NAVAL RESEARCH LAB WASHINGTON D C
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Thin-layer chromatography TLC using a silica gel adsorbent on a plastic backing, and n-heptane-acetone 955 developing solvent, permits useful separation of a esters derived from pentaerythritol, dipentaerythritol, and dibasic acids, b silicones, and c petroleum-based fluids. Esterification mixtures of both pentaerythritol and dipentaerythritol could not be resolved into their respective homologs. With benzene developing solvent, the caproate and valerate of pentaerythritol could be separated in other respects, the solvent was less satisfactory than n-heptane-acetone because of its tendency to cause streaked chromatograms. Dibasic acid and trimethylolpropane esters could not be differentiated except by saponification and resolution of the liberated acids with benzene-acetone solvent 8515. TLC shows some promise for rapid, specific separations, e.g., esters and silicones from petroleum-based oils and hydraulic fluids. Even with additional refinements of the method, however, results as precise or complete as those obtained with gas-liquid chromatography GLC or nuclear magnetic resonance NMR appear improbable. Author
- Organic Chemistry
- Physical Chemistry