公开(公告)号：EP0561789B1

公开(公告)日：1996-04-17

申请号：EP91917609.9

申请日：1991-08-29

申请人： ASHLAND OIL, INC.

发明人： MAGGARD, Steven, M. ,  WELCH, William, T.

IPC分类号： G01N21/35

CPC分类号： G01N21/359 ,  G01N21/3577 ,  G01N33/287 ,  Y10S208/01 ,  Y10T436/10 ,  Y10T436/117497 ,  Y10T436/12 ,  Y10T436/212

摘要： Mid-distillate hydrocarbon fuels, preferably having initial boiling points above 350 °F, are separated e.g. by prep-HPLC into non-aromatic and aromatic fractions which are used to set 0 % aromatics (the non-aromatics) and 100 % aromatics (the aromatics) on an NIR spectrophotometer. From NIR aromatic band absorbances of unknown samples, their percent aromatics is determined using this two-point calibration and the Beer-Lambert equation. Preferred NIR bands of 1650-1700 and 2120-2256 exhibit excellent correlation with aromatics content.

公开(公告)号：EP0663997A1

公开(公告)日：1995-07-26

申请号：EP92922726.0

申请日：1992-10-07

申请人： ASHLAND OIL, INC.

发明人： MAGGARD, Steven, M.

IPC分类号： G01N21 ,  G01D18

CPC分类号： G01N21/274

摘要： A calibrated spectrometer can indirectly determine a physical or chemical property of a sample based upon spectral responses measured by the spectrometer with respect to the particular sample. This invention is directed to a method for calibrating or recalibrating a second spectrometer in light of a first spectrometer, or itself, respectively. The calibration employs a unique selection and manipulation of spectral data obtained from both the first and the second instrument. The recalibration employs a unique selection and manipulation of spectral data from the same first instrument, that is obtained both before and after the need for recalibration arises. Instead of modifiying the respective responses of the first and second instrument, or the first instrument before and after the need for calibration arises, this invention modifies the calibration equation of the second, or recalibrated instrument, to yield consistent results to those obtained by the first instrument, or the first instrument before it goes out of calibration. A calibration equation is an equation which transforms spectral data of a particular sample at a variety of wavelengths to a calculated value for a chemical or physical property. Generally, the form of such calibration equations is that of a linear combination of absorbances or mathematical transforms of absorbances measured by the first and second instrument for each sample. Surprisingly, and confirmed statistically, the accuracy of the calibrated or recalibrated instrument is maintained and in some instances improved.

公开(公告)号：EP0555216B1

公开(公告)日：1995-02-15

申请号：EP91906149.9

申请日：1991-03-05

申请人： ASHLAND OIL, INC.

发明人： MAGGARD, Steven, M.

IPC分类号： G01N33/28

CPC分类号： G01N21/359 ,  G01N21/3577 ,  G01N33/2829 ,  G01N2201/129

摘要： Certain selected wavelengths in the near infrared spectra permit analysis of weight percent, volume percent, or even mole percent of each component, e.g. PIANO (paraffin, isoparaffin, aromatic, naphtenes, and olefins), octane (preferably research, motor or pump), and percent of various hydrocarbons, e.g. alpha olefins. Analysis can be nearly continuous anlysis on-line or at-line, as well as batch analysis, e.g. in a quality control laboratory. Preferably the NIR data is converted to a second derivative of the spectra and multiple linear regression performed to model the individual PIANO concentrations, and to predict physical properties of fuel blending components, e.g. research octane of reformate, etc.

公开(公告)号：EP0561789A1

公开(公告)日：1993-09-29

申请号：EP91917609.0

申请日：1991-08-29

申请人： ASHLAND OIL, INC.

发明人： MAGGARD, Steven, M. ,  WELCH, William, T.

IPC分类号： G01N21 ,  G01N33

CPC分类号： G01N21/359 ,  G01N21/3577 ,  G01N33/287 ,  Y10S208/01 ,  Y10T436/10 ,  Y10T436/117497 ,  Y10T436/12 ,  Y10T436/212

摘要： On sépare des combustibles hydrocarbures à distillat moyen, dont les points d'ébullition initiaux se situent de préférence à une température supérieure à 350 °F, à l'aide par exemple d'une chromatographie liquide initiale à haute performance produisant des fractions aromatiques et non aromatiques qui sont utilisées pour produire des aromatiques à 0 % (les fractions non aromatiques) et des aromatiques à 100 % (les fractions aromatiques) sur un spectrophotomètre à infrarouge proche. On détermine le pourcentage d'aromatiques présents dans des échantillons inconnus à partir des absorbances des bandes aromatiques dans l'infrarouge proche, en utilisant cet étalonnage à deux données et l'équation de Beer-Lambert. Les bandes préférées 1650-1700 et 2120-2256 dans l'infrarouge proche présentent une excellente corrélation avec le contenu des aromatiques.