| abstract |
The hydrocarbon charging containing less desirable organosulfur compound is realized to carry out deep desulfuration as follows, produce and there is low levels, namely, the hydrocarbon product of the sulphur of 15ppmw or lower: this charging of hydrotreatment under moderate condition, and the effluent of this hydrotreatment is separated into rich aromatic fraction (compound of its sulfur-bearing be obstructed with space comprising the aromatics difficult degradation of primary amount) and poor aromatic fraction.This rich aromatic fraction is contacted with isomerization catalyst, and this isomerized rich aromatic fraction is recycled to medium hydroprocessing process. |