Development of method for analyzing additives in synthetic lubricant by mass spectrometry technique

Abstract

Additives in synthetic lubricants (Exxon, Shell, BP, Castrol and Mobil) were extracted with methanol. The crude MeOH extract was obtained. Column chromatography with a silica gel adsorbent was used for separating the additives in the crude MeOH extract. The structures of the additives were established by mass spectral evidence. By this method Phenolic compounds, Alkylated diphenylamines, High molecular weight phenolics, Long chain ester, Diester, Phthalate esters, Long chain carboxylic acids, Long chain alcohols and Phosphate esters were identified Molecular weight of base oil were analyzed by GPC-Evaporative Mass Detector technique.