In an atmospheric distillation tower, the maximum flash zone temperature without cracking is 700-800°F. The atmospheric residuum, commonly known as reduced crude, contains a large volume of distillable oils that can be recovered by vacuum distillation at the maximum permissible flash zone temperature. The TBP cut point between vacuum gas oil and vacuum resid is approximately 1075-1125°F. The cut point is generally optimized, depending on the objectives of the vacuum distillation, into asphalt operation and pitch operation.
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