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US4777140A
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Measurement of vanadium content in a refinery stream by electron spin resonance spectroscopy
Assignee: Mobil Oil AS
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Filing: 1987-05-26
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Granted: 1988-10-11
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Expires: 2007-05-26
Abstract
Abstract In the control of a refinery process, vanadium content of the hydrocarbon streams is determined by measuring the intensity of the 5 isotropic and 6 anisotropic ESR spectral peaks. The ln of the sum of the intensities of these two peaks has a linear relationship to vanadium content.
Inventors
- 👤 Leslie R. Rudnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:14
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/60; G01R33/28; G01R33/30; Y; Y10; Y10T; Y10T436/00; Y10T436/12; Y10T436/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
In the method of controlling the severity of a refinery process the steps of: measuring the intensity of the no. 5 isotropic and no. 6 anisotropic peaks of the ESR spectra of hydrocarbons having known vanadium content; from the sum of the measured intensity of the no. 5 isotropic and no. 6 anisotropic peaks in said spectra, preparing a calibration of the vanadium content of hydrocarbon streams as a function of the intensity of the selected spectral peaks; feeding feedstocks to said refinery process; during the operation of said refinery process, measuring the intensity of said selected no. 5 isotropic and no. 6 anisotropic peaks in the ESR spectra of said feedstocks having unknown vanadium content and determining the sum of said intensities; and determining the vanadium content of said peaks and from the calibration of the sum of the intensities of said selected peaks with vanadium content.
Claim 2
Dependent Claim
148 words
In the method of controlling the severity of a refinery process the steps of: measuring the intensity of the no. 5 isotropic and no. 6 anisotropic peaks of the ESR spectra of hydrocarbons having known vanadium content; from the sum of the measured intensity of the no. 5 isotropic and no. 6 anisotropic peaks in said spectra, preparing a calibration of the vanadium content of hydrocarbon streams as a function of the intensity of the selected spectral peaks; feeding feedstocks to said refinery process; during the operation of said refinery process, measuring the intensity of said selected no. 5 isotropic and no. 6 anisotropic peaks in the ESR spectra of said feedstocks having unknown vanadium content and determining the sum of said intensities; and determining the vanadium content of said peaks and from the calibration of the sum of the intensities of said selected peaks with vanadium content.
Claim 3
Dependent Claim
40 words
The method recited in claim 1 wherein the step of calibrating includes determining the linear relationship between the natural logorithm of the sum of intensities of the no. 5 isotropric and no. 6 anisotropic peaks and the known vanadium content.
Claim 4
Dependent Claim
24 words
The method recited in claim 1 further comprising: controlling the mixture of said feedstocks in response to the determined vanadium content of said stream.
Claim 5
Dependent Claim
16 words
The method recited in claim 1 wherein the known vanadium content is determined by chemical means.
Claim 6
Independent Claim
181 words
The method of controlling the quality of coke in a refinery process comprising: measuring the intensity of the no. 5 isotropic and no. 6 anisotropic peaks of the ESR spectra of hydrocarbons having know vanadium content; from the sum of the measure intensity of the no. 5 isotropic and no. 6 anisotropic peaks in said spectra, preparing a calibration of the vanadium content of hydrocarbon streams as a function of the intensity of the selected spectral peaks; feeding feedstocks to a coking unit in said refinery process; measuring the intensity of the no. 5 isotropic and no. 6 anisotropic peaks of the ESR spectra of said hydrocarbon stream and determining the sum of said intensities; determining the vanadium content of said refinery stream from the sum of the measured intensities of said peaks and from the calibration of the sum of the intensities of said peaks with vanadium content; and controlling the flow of said feedstocks to said coking unit in response to the measured vanadium content of said feedstocks to control the quality of coke produced by said coking unit.
Claim 7
Independent Claim
181 words
The method of controlling the quality of coke in a refinery process comprising: measuring the intensity of the no. 5 isotropic and no. 6 anisotropic peaks of the ESR spectra of hydrocarbons having know vanadium content; from the sum of the measure intensity of the no. 5 isotropic and no. 6 anisotropic peaks in said spectra, preparing a calibration of the vanadium content of hydrocarbon streams as a function of the intensity of the selected spectral peaks; feeding feedstocks to a coking unit in said refinery process; measuring the intensity of the no. 5 isotropic and no. 6 anisotropic peaks of the ESR spectra of said hydrocarbon stream and determining the sum of said intensities; determining the vanadium content of said refinery stream from the sum of the measured intensities of said peaks and from the calibration of the sum of the intensities of said peaks with vanadium content; and controlling the flow of said feedstocks to said coking unit in response to the measured vanadium content of said feedstocks to control the quality of coke produced by said coking unit.
Claim 8
Dependent Claim
37 words
The method recited in claim 5 wherein the step of calibrating includes determining the linear relationship between the natural logorithm of the sum of the no. 5 isotropric and no. 6 anisotropic peaks and known vanadium content.
Claim 9
Dependent Claim
16 words
The method recited in claim 5 wherein the known vanadium content is determined by chemical means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |