EP0304232A2
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EP
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Method for the direct determination of physical properties of hydrocarbon products
Assignee: ABB Eutech Ltd
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Filing: 1988-08-11
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Granted: —
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Expires: 2008-08-11
Abstract
Abstract The properties of a product and/or the yield of the product from a hydrocarbon conversion or separation process are determined from the NIR (Near Infra Red) spectrum of the feedstock by a method which comprises the following steps: (a) determining with an IR spectrometer the absorbance of the feedstock at a certain number of frequencies in the spectral range 16667 to 3840 cm⁻¹, preferably 12500 to 3840 cm⁻¹, most preferably 4760 to 4999 cm⁻¹ starting from a defined base line, and (b) determining the property by applying a correlation between the property and the absorbance values, the correlation being determined experimentally by multivariate regression, depending on the type of spectrometer used, the property required, and the frequencies used.
Inventors
- 👤 Alain Bp France Société Anonyme Espinosa
- 👤 Didier Charles Bp France Société Anonyme Lambert
- 👤 Andre Bp France Société Anonyme Martens
- 👤 Gilbert Bp France Société Anonyme Ventron
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 17:13
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/359; G01N21/3577; G01N33/00; G01N33/26; G01N33/28; G01N33/2829
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
112 words
A method for the determination of the properties of the product and/or the yield of the product in a hydrocarbon conversion or separation process characterised by the fact that the method comprises the following steps: (a) determining with an IR spectrometer the absorbance of the feedstock at a certain number of frequencies in the spectral range 16667 to 3840 cm⁻¹, starting from a defined base line, and (b) determining the property by applying a correlation between the property and yield of the product and the absorbance values of the feedstock, the correlation being determined experimentally by multivariate regression, depending on the type of spectrometer used, the property required, and the frequencies used.
Claim 2
Independent Claim
112 words
A method for the determination of the properties of the product and/or the yield of the product in a hydrocarbon conversion or separation process characterised by the fact that the method comprises the following steps: (a) determining with an IR spectrometer the absorbance of the feedstock at a certain number of frequencies in the spectral range 16667 to 3840 cm⁻¹, starting from a defined base line, and (b) determining the property by applying a correlation between the property and yield of the product and the absorbance values of the feedstock, the correlation being determined experimentally by multivariate regression, depending on the type of spectrometer used, the property required, and the frequencies used.
Claim 3
Dependent Claim
48 words
A method according to claim 1 wherein the processing equipment is computer controlled by a feedback control system for altering process conditions in response to variations in the property and/or yield of the product from the desired value, from the determination of the NIR spectrum of the feedstock.
Claim 4
Independent Claim
21 words
A method according to either of the preceding claims wherein the frequencies are in the spectral range 12500 to 3840 cm⁻¹.
Claim 5
Dependent Claim
18 words
A method according to claim 3 wherein the frequencies are in the spectral range 4760 to 4000 cm⁻¹.
Claim 6
Independent Claim
41 words
A method according to any of the preceding claims characterised by the fact that the frequencies used are selected from the following: 4670 cm⁻¹ 4640 4615 4585 4485 4405 4390 4385 4332 4305 4260 4210 4170 4135 4100 4070 4060 4040
Claim 7
Independent Claim
22 words
A method according to any of the preceding claims characterised by the fact that the base line is taken as 4780 cm⁻¹.
Claim 8
Independent Claim
26 words
A method according to any of the preceding claims wherein the spectrometer is linked to a signal processing device to permit numerical treatment of the spectrum.
Claim 9
Dependent Claim
13 words
A method according to claim 7 wherein the treatment is by Fourier transformation.
Claim 10
Independent Claim
18 words
A method according to any of the preceding claims wherein the method is on-line and in real time.
Claim 11
Independent Claim
20 words
A method according to any of the preceding claims wherein the correlation contains linear terms, quadratic terms and homographic terms.
Claim 12
Independent Claim
43 words
A method according to any of the preceding claims wherein the hydrocarbon conversion process is a catalytic reforming process and the properties are selected from the following: yields of gasoline (C₅⁺), hydrogen and gas, octane numbers (clear or leaded), vapour pressure and density.
Claim 13
Independent Claim
119 words
A method according to any of the preceding claims wherein the hydrocarbon conversion process is a catalytic reforming process, characterised by the fact that the method comprises the further steps of: (c) carrying out differential spectrum measurements in the same range and at the same frequencies on the feedstock and the product, (d) applying a correlation between the differential spectrum and the octane number gain, the correlation being determined experimentally by multivariate regression analysis, (e) comparing the sum of the two values thus determined (octane number and octane number gain) with a desired objective, and (f) modifying the operating conditions of the catalytic reformer until the determined octane number gain is in agreement with the desired octane number gain.
Claim 14
Independent Claim
28 words
A method according to either of claims 11 or 12 wherein the frequencies used are selected from the following: 4670 cm⁻¹ 4485 4332 4305 4210 4100 4060 4040
Claim 15
Independent Claim
31 words
A method according to any of claims 1 to 10 wherein the hydrocarbon conversion process is a selective hydrogenation process and the property is the maleic anhydride number of the product.
Claim 16
Independent Claim
41 words
A method according to any of claims 1 to 10 wherein the hydrocarbon conversion process is a catalytic hydrocracking process and the properties are selected from the following: the total conversion of the feedstock to product and the conversion to gasoline.
Claim 17
Dependent Claim
24 words
A method according to claim 15 wherein the frequencies used are selected from the following: 4585 cm⁻¹ 4390 4332 4260 4210 4170 4100 4070
Claim 18
Independent Claim
64 words
A method according to any of claims 1 to 10 wherein the hydrocarbon conversion process is a catalytic cracking process.and the properties are selected from the following: (i) the conversion of the feed to gasoline and the yield of residue in the product, (ii) the density, research octane number (RON) and motor octane number (MON) of clear and leaded gasoline from the cracking process.
Claim 19
Dependent Claim
21 words
A method according to claim 17 wherein the wavelengths are selected from the following: 4670 cm⁻¹ 4615 4485 4135 4100 4060
Claim 20
Independent Claim
47 words
A method according to any of claims 1 to 10 wherein the hydrocarbon conversion process is a visbreaking process and the properties are selected from the following: yield of the gas oil product, the viscosity, specific gravity and xylene equivalent of the residue, and the conversion limit.
Claim 21
Independent Claim
110 words
A method according to any of claims 1 to 10 wherein the hydrocarbon separation process is a distillation process and the properties are selected from the following: (i) the quantitative composition of a mixture of crude oils constituting the feedstock when the distilland is known to be a blend of crude oils, (ii) the yields of products obtained, (iii) the densities and viscosities of the products, (iv) the cetane number, aniline point, cloud point and KUOP characterisation factor of the gas oil product, (v) the n-paraffinic, isoparaffinic, cycloparaffinic and aromatic content of the gasoline and the research octane number (RON) and motor octane number (MON) of clear and leaded gasoline.
Claim 22
Dependent Claim
50 words
Apparatus for carrying out a method according to any of the previous claims comprising an infra red spectrometer and a computer characterised by the fact that the infra red spectrometer is linked to the computer program in such manner that the property may be determined continuously and in real time.
Claim 23
Dependent Claim
49 words
Apparatus according to claim 21 characterised by the fact that it comprises a feedback control system for computer control of the processing equipment in response to variations in the property and/or yield of the product from the desired value, from the determination of the NIR spectrum of the feedstock.
References Cited (Backward Citations)
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