Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

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. This work pr...

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Bibliographic Details
Published in:Fuel processing technology 2017-07, Vol.162, p.37-44
Main Authors: Vargas, Vicmary, Castillo, Jimmy, Ocampo Torres, Ruben, Bouyssiere, Brice, Lienemann, Charles-Philippe
Format: Article
Language:English
Subjects:
Chemical Sciences
Chromatography
Crude oil
Crude oil analysis
Elution
Fractionation
GPC ICP MS
Inductively coupled plasma
Liquid chromatography
Mass spectrometry
Metallocompounds
Nickel compounds
Petroleum
Petroleum products
Polarity
Porphyrin extraction
Separation
Silica gel
Silicon dioxide
Speciation
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Summary: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. This work presents a methodology based on the following two-step approach: (1) A chromatographic column separation is first performed on a silica gel column to 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 complexes within the sample. This method reduces the complexity of petroleum matrices and produces simpler fractions that can be used for further studies. •A method for the separation of metallocompounds in crude oil is proposed.•Combination of GPC ICP MS and UV Vis spectroscopy is used.•Combination of the polarity and the size distribution of the aggregate is correlated.
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2017.03.027