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Resins were extracted from crude oils by adsorption onto various particles followed by desorption using various solvent combinations in a two-step desorption procedure. The extracted resins were analyzed using infrared spectroscopy, followed by local principal component analysis on the polar and aromatic absorption bands. It was found that the adsorption and desorption processes can be related to...
The present study presents a multivariate procedure to reveal light hydrocarbon components which significantly distinguish between source rock thermal extracts. The two source rocks included in this study are the marine shales of the Late Jurassic Spekk Formation and the coals and paralic shales of the Early Jurassic 9re Formation offshore Mid-Norway.Because of the large number of components in...
Porous poly(para-divinylbenzene) and poly(meta-divinylbenzene) particles were synthesised from para-divinylbenzene and meta-divinylbenzene monomers with toluene and 2-ethylhexanoic acid as porogens. The residual vinyl groups in the particles were thereafter reacted using aluminium chloride with dichlorobenzene as a catalyst. The conversion of vinyl groups was followed by analysing polymer particles...
The application of eigenstructure tracking analysis (ETA) for the detection of an impurity under a chromatographic peak is discussed. A window of size three seems to be the most adequate for this problem. Some guidelines for interpretation of the ETA plots are given. A new normalization of spectra is proposed to remove heteroscedastic noise. The effect of this new normalization is compared with...
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