Color gasoline

The analytical procedure was modified from that of the previous study. Since the octane is colorless, a dye was added. The dye chosen was Red LS672, a red dye used to color gasoline for market. It was found to be stable and have no measurable solubility in the water phase. The colored octane was then analyzed colorimetrically in a similar manner to that used for the heavy crude oil. The dye was obtained from Tricon Colors, Inc., Elmwood Park, N. J. 

Solvent Red 27 is a disazo dye used to color gasoline. Its formula indicates that it is made by diazotizing aminoazoxylene and coupling to beta-naphthol. 

Dyes. Dyes are added to gasoline to impart color for a number of reasons. Originally, these compounds were used to identify leaded gasoline so that it would not be used for other inappropriate purposes, such as solvents. Dyes are used to identify different gasoline grades so that pipeline companies can separate tenders, and so that service stations can easily check that the correct grade was placed in the underground tanks (aq). Dyes are usually based on a2o chemistry and are added in concentrations below 10 ppm (see Azo dyes). 

Detergent Additives. Diesel engine deposits ate most troublesome in the fuel dehvery system, ie, the fuel pump and both fuel side and combustion side of the injectors. Small clearances and high pressures mean that even small amounts of deposits have the potential to cause maldistribution and poor atomization in the combustion chamber. The same types of additives used in gasoline ate used in diesel fuel. Low molecular weight amines can also provide some corrosion inhibition as well as some color stabilization. Whereas detergents have been shown to be effective in certain tests, the benefit in widespread use is not fully agreed upon (77). 

Solvent Dyes. These water-iasoluble dyes ate devoid of polar solubilizing groups such as sulfonic acid, catboxyHc acid, or quaternary ammonium. They ate used for coloring plastics, gasoline, oUs, and waxes. The dyes ate ptedomiaandy azo and anthraquiaone, but phthalocyaniaes and ttiaryHnethane dyes ate also used. 

Observable Characteristics - Pf sicaZ State (as normally shipped) Liquid Color Dark green Odor Like gasoline slight aromatic. 

Observable Characteristics - Physical State (as shipped) Liquid Color. Yellow to brown Odor Like gasoline and petroleum. 

Chemical Designations - Synonyms No common synonyms Chemical Formula Not pertinent. Observable Characteristics - Physical State (as shipped) Liquid Color. Colorless Odor Gasoline. Physical and Chemical Properties - Physical State at 15 XI and I atm. Liquid Molecular Weight Not pertinent Boiling Point at I atm. 58 - 275, 14 - 135, 287 - 408 Freezing Point Not pertinent Critical Temperature Not pertinent Critical Pressure Not pertinent Specific Gravity 0.71 - 0.75 at 15°C, (liquid) Vapor (Gas) Specific Gravity 3.4 Ratio cf Specific Heats cf Vapor (Gas) Not pertinent Latent Heat of Vaporization 130 - 150, 71 -81, 3.0 - 3.4 Heat of Combustion -18,720, -10,400, -435.4 Heat of Decomposition Not pertinent. 

A.7 State whether the following properties are extensive or intensive (a) the temperature at which ice melts (b) the color of nickel chloride (c) the energy produced when gasoline burns ... 

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