bottoms fraction containing predominantly the less volatile components ranging from isobutane (having four carbon atoms) to decanes (ten carbon atoms).

Such a distillation column is typically called a depropanizer.

The designer would designate the key components governing the separation design to be propane as the so-called and isobutane as the so-called . In that context, a lighter component means a component with a lower boiling point (or a higher vapor

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