2005
DOI: 10.1021/ie0401354
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Group-Type Analysis of Heavy Crude Oils Using Vibrational Spectroscopy in Combination with Multivariate Analysis

Abstract: Twenty heavy and/or particle-rich crude oils have been quantitatively fractionated into saturates, aromatics, resins, and asphaltenes (SARA) by asphaltene precipitation in n-hexane and highperformance liquid chromatography (HPLC). The newly developed and fully automated HPLC method has a sample capacity corresponding to 0.6 g of heavy crude oil. The crude oils have been characterized by vibrational spectroscopy in the near-infrared (NIR) and infrared (IR) regions. Principal component analyses (PCA) of the data… Show more

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Cited by 94 publications
(87 citation statements)
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“…Instead, hydrocarbon group type analysis is commonly employed [38][39][40][41][42][43][44][45][46] . The traditional SARA-separation is an example of such group type analysis, separating the crude oils in four main chemical classes based on differences in solubility and polarity.…”
Section: Structurementioning
confidence: 99%
“…Instead, hydrocarbon group type analysis is commonly employed [38][39][40][41][42][43][44][45][46] . The traditional SARA-separation is an example of such group type analysis, separating the crude oils in four main chemical classes based on differences in solubility and polarity.…”
Section: Structurementioning
confidence: 99%
“…The SARA fractions were determined according to Hannisdal et al 32 Analytical grade sodium chloride (NaCl for analysis > 99.5 %) and xylene (AnalaR NORMAPUR®, mixture of 3 isomers + ethyl benzene: minimum 98.5 %) were received from Aldrich Chemical Company and VWR International.…”
Section: Methodsmentioning
confidence: 99%
“…PLSR, PCA, etc.). Previous work (Hannisdal et al, 2005) shows that IR spectra are able to predict both the aliphatic and resin contents of crude oil very well. Similar prediction could not be achieved here for resins because, unlike in the previous work where samples were initially separated into SARA fractions which made it easy to make predictions on each SARA fraction, here IR spectra were obtained for the bulk crude oils.…”
Section: Partial Least Square Regression (Plsr)mentioning
confidence: 97%
“…Although the relationship between the crude oils and the generated spectra is not a completely simple one; there are some complications. Especially with regards to the peaks in the 3000-2800cm -1 region where absorption peaks for different groups tend to overlap (Aske et al, 2001;Hannisdal et al, 2005). Figure 2(a-c) shows the Infrared spectra obtained for some of the samples with the wavenumbers in cm -1 plotted against absorbance.…”
Section: Ftirmentioning
confidence: 99%
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