C4 Raffinate is the remaining mixture following the extraction of 1,3-Bitadene from Mixed C4, and utilized as the raw material for MTBE and polybutene plant.

• First Extractive Distillation Unit

  This unit fractionates acetylenes, that dissolve well in DMF (Dimethyl Formamide), an extractant, among mixed C4, butane that does not dissolve in BD, and C4 Raffinate-1 containing butene.

• Second Extractive Distillation Unit

  This unit uses the extractant (DMF) to fractionate crude BD and acetylene from the BD and acetylenes fractionated along with solvents in the first extractive distillation unit.

• BD Fractionation Unit

  This unit produces high-purity 1,3-butadiene in the two continuous separation columns using the differences in boiling points. Light acetylene is recovered as Off Gas and used as fuel, while heavy butene-2 and acetylene are fractionated as C4 Raffinate-2.

C4 Raffinate 1

* The above specifications represent standards may differ from the actual subject matter.