Dow Global Technolgoies LLC

Rohm and Haas Company

Rohm and Haas Chemicals LLC

Warren E Smith

Clark H Cummins

Brian A Jazdzewski

William L Winniford

Robert J Wright

Zahid Asif

Jeremy Chris Reyes

Raymond John Swedo

George David Green

Ronda L Gras

Jim C Luong

A method for marking a petroleum hydrocarbon or a liquid biologically derived fuel; said method comprising adding to said petroleum hydrocarbon or liquid biologically derived fuel at least one compound that is a R, R, R, R, R, R, R, R, Rand R-substituted diaryl ether, wherein R, R, R, R, R, R, R, R, Rand Rindependently are hydrogen, hydrocarbyl or hydrocarbyloxy; wherein each compound having formula (I) is present at a level from 0.01 ppm to 20 ppm.

Diaryl ethers as fuel markers

A method for marking a petroleum hydrocarbon or a liquid biologically derived fuel; said method comprising adding to said petroleum hydrocarbon or liquid biologically derived fuel at least one compound that is a R, R, R, R, R, R, Rand R&#x2014;substituted dibenzofuran, wherein R, R, R, R, R, R, Rand Rindependently are hydrogen, hydrocarbyl, hydrocarbyloxy, aryl or aryloxy; provided that R, R, R, R, R, R, Rand Rcollectively have at least two carbon atoms; wherein each compound having formula (I) is present at a level from 0.01 ppm to 20 ppm.

Substituted dibenzofurans as fuel markers

A method for marking a petroleum hydrocarbon or a liquid biologically derived fuel; said method comprising adding to said petroleum hydrocarbon or liquid biologically derived fuel at least one compound that is a R, R, R, R, R, R, R, R, Rand R-substituted xanthene, wherein R, R, R, R, R, R, R, R, Rand Rindependently are hydrogen, hydrocarbyl, hydrocarbyloxy, aryl or aryloxy; wherein each compound of formula (I) is present at a level from 0.01 ppm to 20 ppm.

Xanthenes as fuel markers

A compound having formula C{Ph(R)(OR)}{Ph(R)(OR)}{Ph(R)(OR)}, wherein Ph represents a benzene ring, R, Rand Rindependently are C-Calkyl; R, Rand Rindependently are C4-C12 alkyl, i, m, n, o, and p independently are zero, one or two; j is one or two.

Tetrarylmethane ethers

A method for marking a petroleum hydrocarbon or a liquid biologically derived fuel by adding to the petroleum hydrocarbon or liquid biologically derived fuel a compound having formula C{Ph(R)(OR)}{Ph(R)(OR)}{Ph(R)(OR)}, wherein Ph represents a benzene ring, R, Rand Rindependently are C-Calkyl or C-Cheteroalkyl; R, Rand Rindependently are C-Calkyl or C-Cheteroalkyl, i, j, m, n, o and p independently are zero, one or two. Each compound having formula C{Ph(R)(OR)}{Ph(R)(OR)}{Ph(R)(OR)} is present at a level from 0.01 ppm to 20 ppm.

Tetrarylmethane ethers as fuel markers

A gas chromatographic method for detecting a marker compound in a fuel by (a) introducing a sample of fuel into a first capillary column coated with a stationary phase based on polydimethylsiloxane and allowing the sample to flow through the first column to produce a first effluent; (b) allowing the first effluent to pass through a detector and identifying a retention time range in it which includes a retention time of the marker compound; (c) introducing only a portion of the first effluent stream which is within the retention time range into a second capillary column coated with either (i) an ionic sorbent or (ii) a polyethylene glycol, and allowing said portion to flow through the second capillary column to produce a second effluent stream; and (d) allowing the second effluent to pass through a detector; wherein the marker compound has formula Ar(R)(OR)and is present in the fuel at a level from 0.01 ppm to 100 ppm.

Analytical method for detecting fuel markers

A gas chromatographic method for detecting a first marker and a second marker in a fuel in two channels: (i) a first capillary column coated with polysiloxane and a second capillary column coated with polyethylene glycol; and (ii) a third capillary column coated with polymethylphenylsiloxane and a fourth deactivated capillary column. The steps are: (a) introducing a first sample into the first column to produce a first effluent; (b) introducing only a portion of the first effluent into the second column to produce a second effluent; (c) allowing the second effluent to pass through a mass spectrometer; (d) introducing a second sample into the third column to produce a third effluent; (e) introducing only a portion of the third effluent into the fourth column to produce a fourth effluent; (f) allowing the fourth effluent to pass through a mass spectrometer.

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Buckinghamshire, United Kingdom

Warren E Smith