petroleum





petroleum



What is petroleum? It is a black viscous  liquid mixture which is present  in rock strata and can be extracted and refined to produce fuel, kerosene, diesel.

           FORMATION OF PETROLEUM
Petroleum  was formed  over millions of years by decomposition  of millions  of dead microscopic marine algae, animals and plants which under great pressure heat and bacterial activity is converted to crude oil and natural gases. 

    COMPOSITION OF PETROLEUM

*Natural gases contains many methane and some ethane, propane and butane while  crude oil contains  alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, sulphur, nitrogen compound, oxygen compound, halogen. 

Types of crude oil
Crude oil can be classified by their density or by their sulphur content. 
We have 
*crude oil with low sulphur and it is said to  be sweet 
*crude oil with high sulphur and it is said to be soured. 
We also have light crude, medium crude,heavy crude ,extra heavy. 
Light crude contains  31.1
Medium crude  between 22.3& 31
Heavy crude 22.0
Extra heavy 10.0

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