Determination of aromatics in hydrocarbons by near infrared spectroscopy and calibration therefor
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United States of America Patent
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Sep 8, 1992
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N/A
app pub date -
Dec 11, 1990
filing date -
Dec 11, 1990
priority date (Note) -
Expired
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Abstract
Mid-distillate hydrocarbon fuels, preferably having initial boiling points above 350.degree. 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.
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