Tagging and identifying organic liquids including fuels

Details Tagging and identifying organic liquids including fuels Tagging and identifying organic liquids including fuels

1998-05-20

1999-05-18

Warden, Jill

Chemistry: analytical and immunological testing

Tracers or tags

436 25, 436 27, 436 28, 436 29, C09B35/023

Patent

active

059050438

ABSTRACT:
A water-immiscible organic fluid is tagged and identified by tagging the organic fluid with between about 0.25 and about 100 ppm of a marker compound having the formula: ##STR1## where the OH groups are either ortho or para to the diazo moieties, and the Xs are the same or different and are selected from C.sub.1 -C.sub.12 -alkyl, Cl, Br, F, NH.sub.2, CN, NO.sub.2, NH(C.sub.1-3 -alkyl) and N(C.sub.1-3 -alkyl).sub.2, and the fluid is identified by extracting the tagged fluid with an alkaline aqueous extractant having a pH above about 12 and containing, based on 100 parts by weight of said extractant, between about 10 and about 60 parts by weight of an organic cosolvent having the formula:

REFERENCES:
patent: 5142030 (1992-08-01), Zimin et al.
patent: 5156653 (1992-10-01), Friswell et al.
patent: 5252106 (1993-10-01), Hallisy
patent: 5560855 (1996-10-01), Hinton et al.
patent: 5737871 (1998-04-01), Friswell

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