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In chemistry, the iodine value (IV; also iodine absorption value, iodine number or iodine index) is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the degree of unsaturation in fats , oils and waxes .
Biofuels include bioethanol, an alcohol made by fermentation—often used as a gasoline additive, and biodiesel, which is usually used as a diesel additive. Specific energy is energy per unit mass, which is used to describe the chemical energy content of a fuel, expressed in SI units as joule per kilogram (J/kg) or equivalent units. [1]
Biodiesel fuels can also be produced using other alcohols, for example using ethanol to produce fatty acid ethyl esters, however these types of biodiesel are not covered by EN 14214 which applies only to methyl esters i.e. biodiesel produced using methanol. This European Standard exists in three official versions - English, French, German.
Bromine number – Mass of bromine absorbed by 100 grams of a given substance; EN 14214 – Fuel standard for biodiesel; Epoxy value – Measure of the epoxy content of a substance; Hydroxyl value – Mass of KOH needed to neutralize 1 gram of acetylized substance; Iodine value – Mass of iodine absorbed by 100 grams of a given substance
Basically, iodine number is a measure of the iodine adsorbed in the pores and, as such, is an indication of the pore volume available in the activated carbon of interest. Typically, water-treatment carbons have iodine numbers ranging from 600 to 1100. Frequently, this parameter is used to determine the degree of exhaustion of a carbon in use.
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The National Standards of Canada for biodiesel are published by the Canadian General Standards Board (CGSB): [1] CAN/CGSB-3.520 Diesel Fuel Containing Low Levels of Biodiesel (B1 - B5) CAN/CGSB-3.522 Diesel Fuel Containing Biodiesel (B6-B20) CAN/CGSB-3.524 Biodiesel (B100) for Blending in Middle Distillate Fuels