Simultaneous Determination of Water and Oil in Oil Sludge by Low-Field 1H NMR Relaxometry and Chemometrics

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• 作者：Xiaoyuan Zheng ; Yuqi Jin ; Yong Chi ; Mingjiang Ni
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：October 17, 2013
• 年：2013
• 卷：27
• 期：10
• 页码：5787-5792
• 全文大小：326K
• 年卷期：v.27,no.10(October 17, 2013)
• ISSN：1520-5029

文摘

In the process of oil sludge treatment, water and oil contents are of particular interest. In this study, the performance of a rapid, accurate analysis of water and oil in oil sludge through low-field ¹H NMR relaxometry, followed by using partial least-squares (PLS) regression models, is reported. In total, 13 oil sludge samples collected from the Hangzhou petroleum refinery are analyzed. Calibration models are developed by PLS regression with full cross-validation on the data obtained using azeotropic distillation by the Dean鈥揝tark method as a reference. The results indicate that calibration is satisfactory (R_cal² > 0.99) for both water and oil, when using the raw magnetization decay data for PLS regression; the root mean squared errors of cross-validation (RMSECV) are 0.78% and 0.82% for water and oil, respectively. This shows that low-field ¹H NMR relaxometry is a rapid, reliable, nondestructive, and solvent free alternative for determining the water and oil contents of oil sludge.