Distribution of Thioethers in Hydrotreated Transformer Base Oil by Oxidation and ICP-AES Analysis
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- 作者：Chao Qiu ; Sheng Han ; Xingguo Cheng ; and Tianhui Ren
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2005
- 出版时间：May 25, 2005
- 年：2005
- 卷：44
- 期：11
- 页码：4151 - 4155
- 全文大小：74K
- 年卷期：v.44,no.11(May 25, 2005)
- ISSN：1520-5045
文摘
A method was developed to analyze the distribution of thioether compounds in model sulfurcompounds by oxidation and ICP-AES analysis and then applied to analyze hydrotreated baseoil. Model thioethers were oxidized to the corresponding sulfoxides by tetrabutylammoniumperiodate and sodium metaperiodate, and the reduced periodate was quantitatively precipitatedin the form of silver iodate. The silver iodate was transformed to AgNO3 after calcination andthe addition of concentrated nitric acid. The concentration of Ag+ was determined by ICP-AES,and the concentration of thioethers was calculated with a relational equation. Aliphatic thioetherscould be oxidized to sulfoxides under reflux by tetrabutylammonium periodate, and all thioetherscould be oxidized to sulfoxides under reflux by sodium metaperiodate, and then the contents ofaliphatic thioethers and total thioethers were determined in sample oil. The thioethers inKelamayi hydrotreated transformer base oil were analyzed by the same method. Researchindicated that this method has a high sensitivity and good selectivity.