Characterization of crude oil by ultraviolet visible spectroscopy

Patent metadata

Field	Value
Publication number	US-2016187253-A1
Application number	US-201615060230-A
Country	US
Kind code	A1
Filing date	Mar 3, 2016
Priority date	Feb 21, 2012
Publication date	Jun 30, 2016
Grant date	—

Abstract

A system and a method for calculating and assigning an indicative value, such as cetane number, pour point, cloud point and aniline point, of a fraction of an oil sample based on an index calculated and assigned from ultraviolet visible spectroscopy data of the oil sample.

First claim

We claim:

1 . A system for assigning an indicative property to a fraction of an oil sample based upon ultraviolet visible spectroscopy data, the system comprising:
a non-volatile memory device that stores calculation modules and data, the data including ultraviolet visible spectroscopy data indicative of absorbance values at predetermined increments between a predetermined range for the oil sample; a processor coupled to the memory; a first calculation module that calculates a crude oil ultraviolet visible index value of the fraction from the sample's weight and the absorbance values of the spectroscopy data; a second calculation module that calculates and assigns the indicative property for the fraction of the crude oil as a function of the ultraviolet visible index and density of the oil sample.

2 . A system for assigning an indicative property to a fraction of an oil sample comprising:
an ultraviolet spectrometer that outputs ultraviolet visible spectroscopy data; a non-volatile memory device that stores calculation modules and data, the data including ultraviolet visible spectroscopy data indicative of absorbance values at predetermined increments between a predetermined range for the oil sample; a processor coupled to the memory; a first calculation module that calculates a crude oil ultraviolet visible index value of the fraction from the sample's weight and the absorbance values of the spectroscopy data; a second calculation module that calculates and assigns the the indicative property for the fraction of the crude oil as a function of the ultraviolet visible index and density of the oil sample.

3 . A method for operating a computer to assign an indicative property to a fraction of an oil sample based upon ultraviolet visible spectroscopy data, the method comprising:
entering into the computer ultraviolet visible spectroscopy data indicative of absorbance values at predetermined increments between a predetermined range for the oil sample; calculating and assigning a crude oil ultraviolet visible index value of the fraction from the sample's weight and the absorbance values of the spectroscopy data; and calculating and assigning the indicative property of a gas oil fraction as a function of the ultraviolet visible index and density of the oil sample.

4 . A method for assigning an indicative property to a fraction of an oil sample comprising:
obtaining ultraviolet visible spectroscopy data indicative of absorbance values at predetermined increments between a predetermined range for the oil sample; entering into a computer the obtained ultraviolet visible spectroscopy data; calculating and assigning a crude oil ultraviolet visible index value of the fraction from the sample's weight and the absorbance values of the spectroscopy data; and calculating and assigning the indicative property of a gas oil fraction as a function of the ultraviolet visible index and density of the oil sample.

5 . The system as in claim 1 wherein the oil sample is crude oil.

6 . The system as in claim 1 wherein the oil sample is obtained from an oil well, stabilizer, extractor, or distillation tower.

7 . The system as in claim 1 wherein the indicative property is a cetane number.

8 . The system as in claim 1 wherein the indicative property is a pour point.

9 . The system as in claim 1 wherein the indicative property is a cloud point.

10 . The system as in claim 1 wherein the indicative property is an aniline point.

11 . The method as in claim 3 wherein the oil sample is crude oil.

12 . The method as in claim 3 wherein the oil sample is obtained from an oil well, stabilizer, extractor, or distillation tower.

13 . The method as in claim 3 wherein the indicative property is a cetane number.

14 . The method as in claim 3 wherein the indicative property is a pour point.

15 . The method as in claim 3 wherein the indicative property is a cloud point.

16 . The method as in claim 3 wherein the indicative property is an aniline point.

17 . The method as in claim 3 wherein plural indicative properties are calculated including at least two indicative properties selected from the group consisting of cetane number, pour point, cloud point and aniline point.

18 . The method as in claim 3 wherein the indicative property is of a gas oil fraction boiling in the nominal range 180-370° C.

19 . The method as in claim 3 wherein the ultraviolet visible spectroscopy data is obtained from an ultraviolet visible spectroscopy analysis in a wavelength range from 220-400 nm.

20 . The method of claim 4 , further comprising preparing the sample for ultraviolet visible spectroscopy analysis by diluting the sample with a solvent mixture of paraffinic and polar solvents.

21 . The method of claim 20 , wherein the paraffinic solvent contains from 5-20 carbon atoms.

22 . The method of claim 20 , wherein the polar solvent is selected based on is Hildebrand solubility factor or by its two-dimensional solubility parameter.

23 . The method of claim 22 , wherein the polar solvent has a Hildebrand solubility rating of at least 19.

24 . The method of claim 22 , wherein the two-dimensional solubility factors of the polar solvent are the complexing solubility parameter and the field force solubility parameter.

25 . The method of claim 24 , wherein the polar solvent's complexing solubility parameter component describes the hydrogen bonding and electron donor acceptor interactions.

26 . The method of claim 24 , wherein the polar solvent's field force solubility parameter is based on the van der Waals and dipole interactions.

27 . The method of claim 20 , wherein the paraffinic-to-polar solvent ratio is 70:30 or greater.

28 . The method of claim 20 , wherein the paraffinic-to-polar solvent ratio is 90:10 or greater.

Assignees

• Saudi Arabian Oil Co

Inventors

• Koseoglu Omer Refa
• Al-Hajji Adnan
• Jamieson Gordon

Classifications

• G01N2201/12

  Circuits of general importance; Signal processing · CPC title

• G01N33/2811

  by measuring cloud point or pour point of oils · CPC title

• G01N21/33 Primary

  using ultraviolet light (G01N21/39 takes precedence) · CPC title

• G01N33/28

  Oils {, i.e. hydrocarbon liquids} (edible oils or edible fats G01N33/03) · CPC title