Vacuum Bottom | Source: Petroluk

Vacuum residue (VR) is the remaining fraction of a crude oil after removing the fuel and oil fractions by successive atmospheric and vacuum distillation. It is the non-volatile bottoms product of the vacuum distillation unit (VDU), which itself processes the atmospheric residue (AR) left after the primary crude distillation column. Vacuum residue is, literally, the bottom of the barrel.

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