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Bromine number
 
 
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Bromine number is the amount of bromine
Bromine

Bromine , , meaning "stench " ), is a chemical element with the symbol Br and atomic number 35. A halogen element, bromine is a reddish-brown Volatility liquid at Standard conditions for temperature and pressure that is intermediate in reactivity between chlorine and iodine....
 in grams absorbed by 100 grams of a sample. The number indicates the degree of unsaturation
Saturation (chemistry)

In chemistry, saturation has five different meanings:#In physical chemistry, saturation is the point at which a solution of a substance can dissolve no more of that substance and additional amounts of it will appear as a Precipitation ....
.

The Bromine Number is useful as a measure of aliphatic unsaturation in gasoline
Gasoline

File:GasCan.jpgGasoline or petrol is a petroleum-derived liquid mixture, primarily used as fuel in internal combustion engines.It consists mostly of aliphatic hydrocarbons, enhanced with iso-octane or the aromatic hydrocarbons toluene and benzene to increase its octane rating....
 samples. The ARB
California Air Resources Board

The California Air Resources Board, also known as is the "clean air agency" in the government of California. Established in 1967 in the Mulford-Carrell Act, combining the Bureau of Air Sanitation and the Motor Vehicle Pollution Control Board, the ARB is a department within the Cabinet -level California Environmental Protection Agency....
, in its Motor Vehicle Fuels Compliance Assistance Program, indicated that every unit mass of Bromine Number is equivalent to twice the percentage point of olefin content in gasoline.






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Bromine number is the amount of bromine
Bromine

Bromine , , meaning "stench " ), is a chemical element with the symbol Br and atomic number 35. A halogen element, bromine is a reddish-brown Volatility liquid at Standard conditions for temperature and pressure that is intermediate in reactivity between chlorine and iodine....
 in grams absorbed by 100 grams of a sample. The number indicates the degree of unsaturation
Saturation (chemistry)

In chemistry, saturation has five different meanings:#In physical chemistry, saturation is the point at which a solution of a substance can dissolve no more of that substance and additional amounts of it will appear as a Precipitation ....
.

The Bromine Number is useful as a measure of aliphatic unsaturation in gasoline
Gasoline

File:GasCan.jpgGasoline or petrol is a petroleum-derived liquid mixture, primarily used as fuel in internal combustion engines.It consists mostly of aliphatic hydrocarbons, enhanced with iso-octane or the aromatic hydrocarbons toluene and benzene to increase its octane rating....
 samples. The ARB
California Air Resources Board

The California Air Resources Board, also known as is the "clean air agency" in the government of California. Established in 1967 in the Mulford-Carrell Act, combining the Bureau of Air Sanitation and the Motor Vehicle Pollution Control Board, the ARB is a department within the Cabinet -level California Environmental Protection Agency....
, in its Motor Vehicle Fuels Compliance Assistance Program, indicated that every unit mass of Bromine Number is equivalent to twice the percentage point of olefin content in gasoline. So, a gasoline with Bromine Number 30 would have an olefin content of not more than 15 percent by volume. One refinery compiled a year's worth of data on Bromine Number and the corresponding olefin content of gasoline. The data showed that the Bromine Number of gasoline is about 2.4 times the olefin content. A gasoline with Bromine Number of 30 would then have an olefin content of about 12.5 percent by volume, which is slightly lower than ARB's assumption, but still is higher than the CaRFG maximum limit of 10 percent by volume.

The Bromine Number is usually determined by electrochemical titration, where bromine is generated in situ with the redox process of potassium bromide and bromate in an acidic solution, using a mercury catalyst to ensure the complete bromination of all olefins.

it is similar to 12 value and useful for oils containing fatty acids with conjugated system of double bonds.it can be calculated asan equivalent 12 value by multiplying result by: M.Wt of I2/M.Wt ofBr2*167.9/79.2