CHARACTERIZATION OF CRUDE OIL AND ITS FRACTIONS BY FLUORESCENCE SPECTROSCOPY ANALYSIS
First Claim
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1. A system for evaluating a crude oil sample and calculating an indicative property of a naphtha or gas oil fraction of the crude oil sample without first distilling said naphtha or gas oil fraction, the system comprising:
- a fluorometer that outputs fluorescence spectroscopy data;
a non-volatile memory device that stores calculation modules and data, the data including density of the crude oil sample and fluorescence spectroscopy data indicative of absorbance units at predetermined increments between a predetermined range for the oil sample, as derived by an analysis of the crude oil sample by the fluorometer;
a processor coupled to the non-volatile memory;
a first calculation module that retrieves the fluorescence spectroscopy data from the non-volatile memory device, calculates a crude oil fluorescence spectroscopy index value of the fraction from the absorbance units of the fluorescence spectroscopy data, and transfers the calculated crude oil fluorescence spectroscopy index value into the non-volatile memory; and
a second calculation module that calculates the indicative property for the naphtha or gas oil fraction of the crude oil from a two-variable polynomial equation with predetermined constant coefficients developed using linear regression techniques, and that stores the indicative property into the non-volatile memory device;
wherein the two variables of the two-variable polynomial equation are the crude oil fluorescence spectroscopy index and the density of the crude oil sample.
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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.
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Citations
22 Claims
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1. A system for evaluating a crude oil sample and calculating an indicative property of a naphtha or gas oil fraction of the crude oil sample without first distilling said naphtha or gas oil fraction, the system comprising:
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a fluorometer that outputs fluorescence spectroscopy data; a non-volatile memory device that stores calculation modules and data, the data including density of the crude oil sample and fluorescence spectroscopy data indicative of absorbance units at predetermined increments between a predetermined range for the oil sample, as derived by an analysis of the crude oil sample by the fluorometer; a processor coupled to the non-volatile memory; a first calculation module that retrieves the fluorescence spectroscopy data from the non-volatile memory device, calculates a crude oil fluorescence spectroscopy index value of the fraction from the absorbance units of the fluorescence spectroscopy data, and transfers the calculated crude oil fluorescence spectroscopy index value into the non-volatile memory; and a second calculation module that calculates the indicative property for the naphtha or gas oil fraction of the crude oil from a two-variable polynomial equation with predetermined constant coefficients developed using linear regression techniques, and that stores the indicative property into the non-volatile memory device; wherein the two variables of the two-variable polynomial equation are the crude oil fluorescence spectroscopy index and the density of the crude oil sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for evaluating a crude oil sample and calculating an indicative property of a naphtha or gas oil fraction of the crude oil sample without first distilling said naphtha or gas oil fraction, the method comprising:
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obtaining density of the crude oil sample; providing a fluorometer that outputs fluorescence spectroscopy data subjecting said crude oil sample to fluorescence spectroscopy analysis using the fluorometer, and entering absorbance units of the fluorescence spectroscopy data into non-volatile memory of a computer; using a processor of the computer to calculate a crude oil fluorescence spectroscopy index value of the fraction from the absorbance units of the spectroscopy data; and using the processor to calculate and enter into the non-volatile memory the indicative property for the naphtha or gas oil fraction of the crude oil from a two-variable polynomial equation with predetermined constant coefficients developed using linear regression techniques; wherein the two variables of the two-variable polynomial equation are the crude oil fluorescence spectroscopy index and the density of the crude oil sample. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification