The most valuable fractions for the chemical industry, and for producing petrol, are liquefied petroleum gas (LPG), naphtha, kerosine and gas oil. Thus the various fractions obtained from the distillation of crude oil and the associated gases have to be treated further in oil refineries to make them useful. Most of these are straight chain, saturated hydrocarbons which, except for burning, have relatively little direct use in the chemical industry or as fuel for cars. ![]() Oil, and the gases associated with it, consists of a mixture of hundreds of different hydrocarbons, containing any number of carbon atoms from one to over a hundred. We depend largely on crude, the gases associated with it and natural gas (mainly methane) as the source of liquid fuels (petrol, diesel) and the feedstock for the chemical industry.
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