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

1992-09-08

1994-09-20

Myers, Helane

Mineral oils: processes and products

Refining

Sulfur removal

208 12, 208177, 208DIG1, 436 55, C10G 4500

Patent

active

053486455

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. Also similar techniques measure sulfur through correlation with the benzothiophenic band and its overtones and combination bands, or possibly directly.

REFERENCES:
patent: 5062976 (1991-11-01), Audeh
patent: 5145785 (1992-09-01), Maggard
patent: 5171691 (1992-12-01), Kline et al.

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