Abstract:
Petroleum products are marked with a marker such as thymolphthalein or cresolphthalein. When the marked petroleum products are contacted with a developing reagent, a color develops.
Abstract:
Carbonyl compounds, such as ketones, aldehydes, esters, amides, anhydrides and carboxylic acids are added to a material, particularly a liquid material as markers. Subsequently the carbonyl compound(s) are identified by measuring the absorbency peak(s) of the carbonyl compounds in the mid-IR range. Carbonyl compounds soluble in non-polar solvents and substantially insoluble in water are particularly suitable for tagging and identifying petroleum fuels. For use in petroleum fuels, the carbonyl compound(s) preferably contains no element other than carbon, hydrogen, oxygen and nitrogen. Digital carbonyl marker systems, i.e., systems containing two or more carbonyl compounds in predetermined ratios, can be determined quantitatively with instruments, such as SpecTrace.TM. which measure absorbance in the mid-IR region.
Abstract:
Liquid petroleum products and industrial liquids are marked with highly soluble silent fluorescent markers having the formula: ##STR1## where R is selected from a linear or branched C.sub.1 -C.sub.18 alkylcarboxy radical.
Abstract:
This invention provides a method for imparting invisible markings for identification purposes to petroleum hydrocarbons by incorporating one or more infrared fluorescing compounds therein. Certain infrared fluorophores from the classes of squaraines (derived from squaric acid), phthalocyanines and naphthalocyanines are useful in providing invisibly marked petroleum hydrocarbons such as crude oil, lubricating oils, waxes, gas oil (furnace oil), diesel oil, kerosene and in particular gasoline. The near infrared fluorophores are added to the hydrocarbons at extremely low levels and are detected by exposing the marked hydrocarbon compositions to near infrared radiation having a wavelength in the 670-850 nm range and then detecting the emitted fluorescent light via near infrared light detection means.
Abstract:
Petroleum fuels are tagged with markers having the formula: ##STR1## where R.sup.1 and R.sup.2 are selected from H, methyl, ethyl, methoxy, halogen, cyano and nitro and R.sup.3 is selected from methyl, methoxy methoxyethoxy and morpholino.
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,m is from 1 to 4,X.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl, cyano or nitro,X.sup.2 is hydrogen, C.sub.1 -C.sub.4 -alkyl, cyano, nitro, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.16 -alkoxycarbonyl,X.sup.3 is hydrogen, C.sub.1 -C.sub.4 -alkyl, cyano or C.sub.1 -C.sub.16 -alkoxycarbonyl, andX.sup.4 is hydrogen, hydroxyl, substituted or unsubstituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.4 -alkoxy, amino, C.sub.1 -C.sub.4 -dialkylamino or substituted or unsubstituted C.sub.1 -C.sub.16 -monoalkylamino,as solvent a partially or completely water-miscible organic solvent, and as base an alkali or alkaline earth metal hydroxide, an alkali metal carbonate or a quaternary ammonium hydroxide, the use of azo dyes as markers for mineral oils, and novel azo dyes.
Abstract:
Liquid petroleum products are marked with markers having the formula: ##STR1## wherein the R.sub.1 's and the R.sub.2 's are the same or different and are each selected from --H and C.sub.1 -C.sub.7 alkyls; provided that at least one, and preferably both, R.sub.1 's are a C.sub.3 -C.sub.7 alkyl; and provided that the R.sub.3 's are the same or different and are selected from --H, --NO.sub.2, --Br, --F, --CN, and --Me; and provided that at least one R.sub.3 is selected from --NO.sub.2, --Cl, --Br, --F, and --CN.
Abstract:
Method of determining the presence of one or more liquid hydrocarbons in a liquid hydrocarbon mixture, the method having the step of adding to the hydrocarbon or hydrocarbons to be detected a minor amount of an alkylated isodibenzanthrone.
Abstract:
A new alkylated quinizarin, 2(2-ethylhexyl) quinizarin, useful for marking water immiscible organic liquids; marked water immiscible organic liquids; and a method of marking said liquids with an additive which may be subsequently extracted from said liquid and easily identified by visual inspection. The method comprises dissolving in the liquid to be marked an additive selected from the group consisting of an alkylated quinizarin, the reaction product of diazotized ortho tolidine and pnonylphenol and of diazotized xylidine and p-nonylphenol. The additive is detected by extraction from the marked liquid by means of a water soluble polar organic solvent containing a base and from 0 to about 75 percent by weight of water to yield a distinctively colored extract which is identified by visual inspection. The identification may be further corroborated by chromatographic separation of the additive or by spectrophotometric analysis.