Diesel fuel (D2, D6)

Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil.The important properties which are used to characterize diesel fuel include cetane number (or cetane index), fuel volatility, density, viscosity, cold behavior, and sulfur content. Diesel fuel specifications differ for various fuel grades and in different countries. Diesel fuel is a mixture of hydrocarbons with boiling points in the range of 150 to 380°C which are obtained from petroleum. Petroleum crude oils are composed of hydrocarbons of three major classes: (1) paraffinic, (2) naphthenic (or cycloparaffinic), and (3) aromatic hydrocarbons. Unsaturated hydrocarbons (olefins) rarely occur in the crude. In modern chemistry, the respective groups of hydrocarbons are called alkanes and cycloalkanes.
This fuel is relatively dense and oily, it is composed of a blend of different types of hydrocarbons, including paraffins, naphthenes, olefins, and aromatics. Different types of diesel fuel have different blend ratios, depending on what the fuel will be used for, the temperature of the area in which it will be used and regional governmental regulations. One of the main components addressed by governments is sulfur, which can lead to very harmful emissions when the fuel is used.In modern times, much of the diesel sold in the US and EU is Ultra-Low Sulfur Diesel (ULSD), which has most of the sulfur removed. This fuel has a wide range of uses, including in private vehicles, public transportation vehicles, and 18 wheelers and other large delivery trucks. Many off road vehicles also run on diesel, as do many boats. Its efficiency makes it popular for use in farm and military vehicles as well. Diesel is used to power machinery as well a lot of industrial and construction equipment runs on it.