The process
through which crude oil is
purified and treated to remove
unusable substances is called
REFINING. This process is also used to
separate oil into different usable
petroleum products. All this takes
place in an oil refinery.
All refineries
perform three basic functions:
Refineries are highly automated and
technologically advanced. That is why a
typical refinery costs billions of dollars to
build. It also costs millions to operate,
employing hundreds of people and
running every day of the year.
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