Separation of lubricating base oils and additives by continuous elution column chromatography

ONO Yukio, TANAKA Shigeyuki

doi:10.2116/bunsekikagaku.24.694

A new elution method was developed for the separation of additives in lubricating oils and additives concentrates using silica gel or alumina as adsorbent. The experiment was carried out using soxhlet extractor equipped with a extracting tube, 30 mm od and 188 mm long, filled with 50 g of activated 100 to 200 mesh silica gel or alumina. A l g sample of oil is transfered to the top of the column and petroleum ether is circulated through the column continuously.<BR>In the case of silica gel, recoveries of base oils were more than 99% for neutral oils and about 98% for bright stock oils by circulation of petroleum ether for 16 hours. Adsorbed materials on silica gel were the same resinous constituents as found in the compositional analysis of lubricating base oils. However, adsorptivity of aromatic hydrocarbons on alumina was markedly increased. The recoveries of base oils for neutral oils were about 98% and for bright stock oils were 92% to 94%.<BR>Moreover, these methods were examined for the separation of 23 additives commercially available. Almost additives except viscosity index improvers such as polymethacrylate were separated from base oils by continuous elution column chromatography.<BR>It was found that the method was applicable to collective determination of base oils in lubricating oils and to concentration of the additives for the identification by instrumental methods.

Separation of lubricating base oils and additives by continuous elution column chromatography

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