Cochin laboratory

ASTM COLOR (D 1500, IP 196, ISO 2049)

This test method covers the visual determination of the color of a wide variety of petroleum products such as lubricating oils, heating oils, diesel fuel oils, and petroleum waxes

GARDNER COLOR (D 1544)

This test method covers the measurement of the color of transparent liquids by means of comparison with arbitrarily numbered glass standards. It applies to drying oils, varnishes, fatty acids, polymerized fatty acids, and resin solutions

PLATINUM-COBALT COLOR (D 1209)

This test method describes a procedure for the visual measurement of the color of essentially light colored liquids. It is applicable only to materials in which the color-producing bodies present have light absorption characteristics nearly identical with those of the platinum-cobalt color standards used.

SAYBOLT COLOR (P 14, D 156)

This test method covers the determination of the color of refined oils such as undyed motor and aviation gasoline, jet propulsion fuels, naphtha and kerosene, and, in addition, petroleum waxes and pharmaceutical white oils. For determining the color of petroleum products darker than Say bolt Color −16

CH Ratio

Combustion energy for carbon is 393.5 kJ per mole and of hydrogen is 285 kJ per mole. eqn. of combustion of hydrocarbons is: CxHy + (x+y/4)O2 = xCO2 + y/2H2O and C has 12 times mass than H so the proportion which gives more energy per mole and has less molecular weight makes a better fuel.

The Carbon hydrogen ratio of petroleum product can be calculated from the following formula