A FRACTIONATION SYSTEM AND FRACTIONATION METHOD USING THEREOF

摘要

PURPOSE: A fractional distillation equipment, and a method of fractional distillation thereof are provided to comprise a heating unit which heats a first lower stream and a second lower stream by heat-exchanging a third lower stream with the first and second lower streams. CONSTITUTION: A fractional distillation equipment comprises: a first distillation column (200), a second distillation column (300), a third distillation column (400), and a heating unit (50). The first distillation column discriminates a processed material to ethane intensified first overhead stream flow (210) and a first lower stream flow (230) intensified with a material which is closer to a medium quality than ethane. The second distillation column discriminates the first lower stream to propane intensified second overhead steam flow (310), and a second lower steam flow (330) intensified with a material which is closer to the medium quality than propane. The third distillation column discriminates the second lower stream flow to butane intensified third overhead steam flow (430) and a third lower stream flow (430) intensified with a material which is closer to the medium quality than butane. The heating unit heats at least one between the first and second lower streams by heat-exchanging the third lower stream with at least one between the first and second lower streams.