US 12,169,192 B2
Methods of identifying a hydrocarbon fuel
Scott D. Schwab, Richmond, VA (US); and Dana Anderson, Williamsburg, VA (US)
Assigned to AFTON CHEMICAL CORPORATION, Richmond, VA (US)
Filed by Afton Chemical Corporation, Richmond, VA (US)
Filed on Nov. 2, 2020, as Appl. No. 17/087,127.
Prior Publication US 2022/0136968 A1, May 5, 2022
Int. Cl. G01N 33/28 (2006.01); C10L 1/00 (2006.01); G01N 1/40 (2006.01); G01N 21/64 (2006.01); C09B 11/08 (2006.01); C09B 11/24 (2006.01)
CPC G01N 33/2882 (2013.01) [C10L 1/003 (2013.01); G01N 1/4055 (2013.01); G01N 21/64 (2013.01); C09B 11/08 (2013.01); C09B 11/24 (2013.01); C10L 2200/0423 (2013.01); C10L 2230/16 (2013.01); G01N 2001/4061 (2013.01)] 21 Claims
 
1. A method for identifying a hydrocarbon fuel, the method comprising:
obtaining a sample of a hydrocarbon fuel containing a measurable amount of a marker compound, the marker compound having a fluorescence intensity and at least partially soluble in distilled or deionized water;
combining the hydrocarbon fuel with distilled or deionized water to form a fuel-and-water mixture and mixing the fuel-and-water mixture;
after the mixing, allowing the fuel-and-water mixture to separate into a water phase and a fuel phase to at least partially extract the marker compound into the water phase;
subjecting the water phase to light having a wavelength of 250 nm to 800 nm and observing the fluorescence emitted from the marker compound in the water phase; and
wherein the marker compound having a fluorescence intensity has a structure of Formula II:

OG Complex Work Unit Chemistry