Bromine number

Bromine number

Bromine number is the amount of bromine in grams absorbed by 100 grams of a sample. The number indicates the degree of unsaturation.

The Bromine Number is useful as a measure of aliphatic unsaturation in gasoline samples. The ARB, 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.

ee also

* Iodine number


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  • Bromine — (pronEng|ˈbroʊmiːn/, /ˈbroʊmaɪn/, /ˈbroʊmɪn, el. βρῶμος, brómos , meaning stench (of he goats) Gemoll W, Vretska K: Griechisch Deutsches Schul und Handwörterbuch ( Greek German dictionary ), 9th ed., published by [http://www.oebvhpt.at/ öbvhpt] …   Wikipedia

  • bromine — Symbol: Br Atomic number: 35 Atomic weight: 79.909 Halogen element. Red volatile liquid at room temperature. Its reactivity is somewhere between chlorine and iodine. Harmful to human tissue in a liquid state, the vapour irritates eyes and throat …   Elements of periodic system

  • bromine — /broh meen, min/, n. Chem. an element that is a dark reddish, fuming, toxic liquid and a member of the halogen family: obtained from natural brines and ocean water, and used chiefly in the manufacture of gasoline antiknock compounds,… …   Universalium

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  • Bromine trifluoride — Chembox new ImageFile = Bromine trifluoride 3D vdW.png ImageSize = 150px ImageName = Bromine trifluoride Section2 = Chembox Properties Formula = BrF3 MolarMass = 136.90 g/mol Appearance = straw coloured liquid Density = 2.8 g/ml, liquid… …   Wikipedia

  • bromine — noun /ˈbrəʊmɪn,ˈbrəʊmaɪn,ˈbroʊmin/ a) A nonmetallic chemical element (symbol Br) with an atomic number of 35; one of the halogens b) A bromine atom in a molecule Syn: muride See Also: brome …   Wiktionary

  • bromine — A nonmetallic, reddish, volatile, liquid element; atomic no. 35, atomic wt. 79.904; valences 1–7, inclusive; it unites with hydrogen to form hydrobromic acid, and this reacts with many metals to form bromides, some of which are used in medicine.… …   Medical dictionary

  • bromine — [ brəʊmi:n] noun the chemical element of atomic number 35, a dark red toxic liquid halogen with a choking, irritating smell. (Symbol: Br) Origin C19: from Fr. brome, from Gk brōmos a stink , + ine4 …   English new terms dictionary

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