Analytical Sciences

Abstract − Analytical Sciences, 21(6), 721 (2005).

Determination of Sulfur Compounds in Hydrotreated Transformer Base Oil by Potentiometric Titration
Qiu CHAO,* Han SHENG,* Xingguo CHENG,** and Tianhui REN*
*School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
**Lanzhou Lube Oil R&D Institute of Petrochina, 369 Yumen Street, Lanzhou 730060, P. R. China
A method was developed to analyze the distribution of sulfur compounds in model sulfur compounds by potentiometric titration, and applied to analyze hydrotreated transformer base oil. Model thioethers were oxidized to corresponding sulfoxides by tetrabutylammonium periodate and sodium metaperiodate, respectively, and the sulfoxides were titrated by perchloric acid titrant in acetic anhydride. The contents of aliphatic thioethers and total thioethers were then determined from that of sulfoxides in solution. The method was applied to determine the organic sulfur compounds in hydrotreated transformer base oil.