Detection of marked mineral oils and novel azo dyes

Details Detection of marked mineral oils and novel azo dyes Detection of marked mineral oils and novel azo dyes

1994-10-12

1996-01-30

McAvoy, Ellen M.

Fuel and related compositions

Liquid fuels

Organic azide compound, or organic compound having acyclic...

534558, 534573, C10L 122

Patent

active

054877709

ABSTRACT:
Method for detecting marked mineral oils by treating the marked mineral oil with an extractant comprising water, a solvent and a base comprises using as marker an azo dye of the formula ##STR1## where ring A may be benzofused,

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patent: 2925333 (1960-02-01), Thompson
patent: 3690809 (1972-09-01), Orelup
patent: 3704106 (1972-11-01), Orelup
patent: 3764273 (1973-10-01), Turner et al.
patent: 4473376 (1984-09-01), Hansen et al.
patent: 4479899 (1984-10-01), Hamprecht
patent: 4904765 (1990-02-01), Derber et al.
patent: 5156653 (1992-10-01), Friswell et al.
patent: 5252106 (1993-10-01), Hallisy

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