Production of non-carcinogenic brightstock extracts

摘要

Provided are multiple correlations for relationships between MI value for a brightstock extract and the distillation cut point temperature used for separation of the vacuum resid that is used to form the brightstock extract. Based on these correlations, a BSE having a desired MI value can be formed based on an adjustment of the distillation cut point temperature. A first correlation establishes a relationship between a fractional weight boiling temperature for a vacuum resid fraction and a distillation cut point temperature for separating the vacuum resid fraction from at least one distillate fraction in a feedstock. A second correlation establishes a relationship between a fractional weight boiling temperature for a brightstock extract derived from the vacuum resid fraction, and the fractional weight boiling temperature for the vacuum resid fraction. A third correlation has been established between the fractional weight boiling temperature for the brightstock extract and a mutagenicity index value.

主权项

1. A method for producing a brightstock extract, comprising:
establishing a first correlation between
a) a fractional weight boiling temperature for a brightstock extract derived from a resid fraction, andb) a fractional weight boiling temperature of the resid fraction, the resid fraction comprising a vacuum resid fraction separated from a feedstock, the feedstock comprising the vacuum resid fraction and at least one distillate fraction,where the first correlation has a linear correlation slope of 0.95 or less; establishing a second correlation between the fractional weight boiling temperature for a brightstock extract and a mutagenicity index value; selecting, based on the first correlation and the second correlation, a distillation cut point temperature corresponding to a mutagenicity index for a brightstock extract of 0.5 or less; distilling a feedstock at the selected distillation cut point temperature to separate one or more distillate fractions from a resid fraction; deasphalting the separated resid fraction to form a deasphalted oil fraction; and performing a solvent extraction on the deasphalted oil to form a brightstock extract fraction having the mutagenicity index of 0.5 or less.