Determination of aromatics in hydrocarbons by near infrared spec

Details Determination of aromatics in hydrocarbons by near infrared spec Determination of aromatics in hydrocarbons by near infrared spec

1990-12-11

1992-09-08

Hill, Jr., Robert J.

Chemistry: analytical and immunological testing

Composition for standardization, calibration, simulation,...

2502521, 250301, 250304, 250339, 436 52, 436 55, 436 60, 436140, 436164, 436171, G01N 2100, G01N 3326

Patent

active

051457857

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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"Nondestructive Analytical Proc. for Simultaneous Estimation of the Major Classes of Hydrocarbon Constituents of Finished Gasolines," Kelly et al., Anal. Chem. 1990, 62, pp. 1444-1451.

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