Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products
Abstract
The separation, quantification and identification of V, Ni and S and their compounds in crude oils or their refining
fractions is a subject of great interest for the oil industry. Such elements and heterocompounds are harmful to industry
catalysts and might be toxic to living organisms. Thiswork presents amethodology based on the following
two-step approach: (1) A chromatographic columnseparation is first performed on a silica gel columnto produce
six fractions from the initial crude oils or petroleum products, such as vacuum residues (VRs). This separation is
achieved by varying the polarity of the elution solvent systems used. (2) The separated fractions are then studied
using gel permeation chromatography (GPC) coupled to an inductively coupled plasma high-resolution mass
spectrometry (ICP-HRMS).
Additionally, the use of ultraviolet (UV)-visible spectroscopy allows for the identification of fractions containing
porphyrinic-type compounds by detecting the Soret band at 405nm. The objective of this two-step approach is to
deduce both the distribution and nature of Ni and V complexeswithin the sample. This method reduces the complexity
of petroleum matrices and produces simpler fractions that can be used for further studies.
Origin : Files produced by the author(s)
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