Which fraction has the highest viscosity

Properties of fractions

Properties of fractions

Each crude oil fraction contains a mixture of hydrocarbons. The hydrocarbons in a fraction are mostly hydrocarbons called alkanes. They have similar (but not identical):

numbers of hydrogen and carbon atoms in their molecules boiling points ease of ignition viscosity

For example, the gases fraction contains hydrocarbons with one to four carbon atoms. These have:

boiling points below room temperature they are very flammable have a low viscosity

The hydrocarbons in different fractions differ in these properties. For example, the bitumen fraction contains hydrocarbons with more than 35 carbon atoms. These have:

boiling points well above room temperature are very difficult to ignite have a high viscosity

Hydrocarbon fuels can undergo complete combustion or incomplete combustion, depending on the amount of oxygen available.

Complete combustion

Complete combustion of a hydrocarbon fuel happens when there is a good supply of air. Carbon and hydrogen atoms in the fuel react with oxygen in an exothermic reaction:

carbon dioxide and water are produced the maximum amount of energy is given out In a Bunsen burner, this occurs when the air hole is fully open.

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Atissue is a group of connected cells that have a similar function within an organism.