Refining is Boiling Oil A large part of refining involves separating the different fractions of crude oil and other intermediate streams. While water boils at a single temperature, crude oil boils over a wide range of temperatures. By controlling the temperature using very tall distillation columns, different fractions of the crude oil can be separated. At the top of the column, fuel gas and liquefied petroleum gas (or LPG) is produced. A little lower down the column, gasoline (or, more pre1144
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