Patent ID: 8986537
Filing Date: 2015-03-24
Classification: C10G,G01N

Abstract:
1. A method for producing a brightstock extract, comprising: establishing a first correlation between 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.