Characterization of crude oil and its fractions by fluorescence spectroscopy analysis

Inactive Publication Date: 2016-07-07
SAUDI ARABIAN OIL CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017]Synchronous fluorescence spectrometry is the method of choice to improve the selectivity of the measurement by taking full advantage of the ability to vary both the excitation and the emission wavelength during analysis. Excitation and emission wavelengths are scanned simultaneously while maintaining a constant wavelength difference between the two modes. This method has been proved successful for materials like polycyclic aromatic hydrocarbons.
[0018]This invention discloses a system and method in which fluorescence spectroscopy analysis is employed to disclose physical and indicative properties (i.e., cetane number, pour point, cloud point, and aniline point) of gas oil fraction of crude oils, as well as the octane number of the naphtha fraction and the aromaticity of whole crude oils. The invention provides insight into the gas oil properties without fractionation/distillation (crude oil assays) and will help producers, refiners, and marketers to benchmark the oil quality and, as a result, valuate the oils without going thru costly and time consuming crude oil assays. Whereas a conventional crude oil assay method could take up to two months, this invention

Problems solved by technology

Due to the number of distillation cuts and the number of analyses involved, the crude oil assay work-up is both costly and time consuming.
To determine these properties of gas oil or naphtha fractions conventionally, these fractions have to be distilled from the crude oil and then measured/identified using

Method used

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  • Characterization of crude oil and its fractions by fluorescence spectroscopy analysis
  • Characterization of crude oil and its fractions by fluorescence spectroscopy analysis
  • Characterization of crude oil and its fractions by fluorescence spectroscopy analysis

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example 1

[0054]A set of constants K and X1-X7 was determined using linear regression for the indicative properties cetane number, pour point, cloud point, aniline point, octane number, and aromaticity. These constants were determined based on known actual distillation data for plural crude oil samples and their corresponding indicative properties. These constants are given in Table 3.

TABLE 3ConstantsCetane NumberPour PointCloud PointK−2.920657E+04−2.283807E+048.016178E+04X18.247657E+046.995129E+04−2.781445E+05X2−8.008823E+04−7.232753E+043.199487E+05X32.758504E+042.532512E+04−1.219746E+05X41.273387E+024.791017E+013.108188E+01X54.207752E−01−8.303909E−021.963374E−01X6−4.676128E−037.142002E−04−1.983566E−03X7−1.581570E+02−5.156225E+01−4.212763E+01ConstantsAniline PointOctane NumberWCO-AROMK−4.370054E+041.017323E+051.047903E+04X11.449824E+05−3.438191E+05−4.741776E+04X2−1.608909E+053.877252E+056.274074E+04X35.979962E+04−1.457003E+05−2.516125E+04X42.649713E+01−9.217455E+008.586987E+01X5−5.686953E−02...

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Abstract

A system and a method are provided for calculating the cetane number, pour point, cloud point, aniline point, aromaticity, and/or octane number of a crude oil and its fractions from the density and fluorescence spectroscopy of a sample of the crude oil.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application No. 62 / 099,703 filed Jan. 5, 2015, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]This invention relates to a method and process for the evaluation of samples of crude oil and its fractions by fluorescence spectroscopy analysis.BACKGROUND OF THE INVENTION[0003]Crude oil originates from the decomposition and transformation of aquatic, mainly marine, living organisms and / or land plants that became buried under successive layers of mud and silt some 15-500 million years ago. They are essentially very complex mixtures of many thousands of different hydrocarbons. Depending on the source, the oil predominantly contains various proportions of straight and branched-chain paraffins, cycloparaffins, and naphthenic, aromatic, and polynuclear aromatic hydrocarbons. These hydrocarbons can be gaseous, liquid, or solid under...

Claims

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Application Information

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IPC IPC(8): G01N33/28G01N21/64G01N33/30
CPCG01N33/2823G01N33/30G01N2201/12G01N21/64G01N33/2811G01N21/645G01N21/25G01N2021/6417
Inventor AL-HAJJI, ADNANKOSEOGLU, OMER REFA
Owner SAUDI ARABIAN OIL CO
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