Residuum / Resid
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  • General term for any refinery fraction that is left behind in a distillation.
  • Atmospheric resid, sometimes called long resid or atmospheric tower bottoms (ATB), is the undistilled fraction in an atmospheric pressure distillation of crude oil.
  • Likewise, vacuum resid, short resid, or vacuum tower bottoms (VTB), is the undistilled fraction in a vacuum distillation.
  • Also see Residuum Upgrading

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