GAS OIL COMPOSITION AND METHOD FOR PRODUCING THE SAME
A gas oil composition comprising at least 20.0% by volume total aromatic content, at least 1.0% by volume bicyclic aromatic content, at least 0.2% by volume trior higher cyclic aromatic content, no more than 18.0% by mass naphthenobenzenes, and no more than 10 ppm by mass sulfur content, and having a density (15° C.) of at least 0.8200 g/cm3, and an ASTM colour of at least 0.2, characterised in that the gas oil composition is obtained by hydrogenation-desulfurisation of the stock oil described below, which contains cracked gas oil fraction: stock oil comprising at least 25.0% by volume total aromatic content, at least 15.0% by mass total naphthene content, at least 4.0% by mass bicyclic naphthene content, at least 1.0% by mass tricyclic naphthene content, and at least 0.50% by mass sulfur content, and having a 90% distillation temperature of at least 340.0° C. The gas oil composition of the present invention has excellent oxidative stability.
1 . A gas oil composition comprising
a total aromatic content of at least 20.0% by volume, a bicyclic aromatic content of at least 1.0% by volume, a tri- or higher cyclic aromatic content of at least 0.2% by volume, no more than 18.0% by mass of naphthenobenzenes, and a sulfur content of no more than 10 ppm by mass, and
having a density (15° C.) of at least 0.8200 g/cm 3 , and an ASTM color of at least 0.2, and
being obtained by hydrogenation-desulfurization of a stock oil containing a cracked gas oil fraction, the stock oil including a total aromatic content of at least 25.0% by volume, a total naphthene content of at least 15.0% by mass, a bicyclic naphthene content of at least 4.0% by mass, a tricyclic naphthene content of at least 1.0% by mass, and a sulfur content of at least 0.50% by mass, and the stock oil having a 90% distillation temperature of at least 340.0° C.
2 . The gas oil composition according to claim 1 , wherein the cracked gas oil fraction is a directly-desulfurized gas oil, and the stock oil contains from 5 to 30% by volume of the directly-desulfurized gas oil,
the directly-desulfurized gas oil including a total aromatic content of at least 25.0% by volume, a total naphthene content of at least 15.0% by mass, a bicyclic naphthene content of at least 4.0% by mass, a tricyclic naphthene content of at least 1.0% by mass, and a sulfur content of at least 0.01% by mass, and having a 90% distillation temperature of no higher than 380.0° C., and a density (15° C.) of no higher than 0.8700 g/cm 3 .
3 . The gas oil composition according to claim 1 , wherein the cracked gas oil fraction is a light cycle oil, and the stock oil contains from 1 to 10% by volume of the light cycle oil,
the light cycle oil including a total aromatic content of at least 60.0% by volume, a total naphthene content of at least 15.0% by mass, a bicyclic naphthene content of at least 3.0% by mass, a tricyclic naphthene content of at least 1.0% by mass, and a sulfur content of at least 0.07% by mass, and having a 90% distillation temperature of no higher than 370.0° C., and a density (15° C.) of no higher than 0.9800 g/cm 3 .
4 . A method for producing a gas oil composition comprising a total aromatic content of at least 20.0% by volume, a bicyclic aromatic content of at least 1.0% by volume, a tri- or higher cyclic aromatic content of at least 0.2% by volume, no more than 18.0% by mass of naphthenobenzenes, and a sulfur content of no more than 10 ppm by mass, and having a density (15° C.) of at least 0.8200 g/cm 3 , and an ASTM color of at least 0.2, comprising
hydrogenation-desulfurizing a stock oil containing a cracked gas oil fraction, the stock oil including a total aromatic content of at least 25.0% by volume, a total naphthene content of at least 15.0% by mass, a bicyclic naphthene content of at least 4.0% by mass, a tricyclic naphthene content of at least 1.0% by mass, and a sulfur content of at least 0.50% by mass, and the stock oil having a 90% distillation temperature of at least 340.0° C.
5 . The method for producing the gas oil composition according to claim 4 , wherein the cracked gas oil fraction is a directly-desulfurized gas oil, and the stock oil contains from 5 to 30% by volume of the directly-desulfurized gas oil,
the directly-desulfurized gas oil including a total aromatic content of at least 25.0% by volume, a total naphthene content of at least 15.0% by mass, a bicyclic naphthene content of at least 4.0% by mass, a tricyclic naphthene content of at least 1.0% by mass, and a sulfur content of at least 0.01% by mass, and having a 90% distillation temperature of no higher than 380.0° C., and a density (15° C.) of no higher than 0.8700 g/cm 3 .
6 . The method for producing the gas oil composition according to claim 4 , wherein the cracked gas oil fraction is a light cycle oil, and the stock oil contains from 1 to 10% by volume of the light cycle oil,
the light cycle oil including a total aromatic content of at least 60.0% by volume, a total naphthene content of at least 15.0% by mass, a bicyclic naphthene content of at least 3.0% by mass, a tricyclic naphthene content of at least 1.0% by mass, and a sulfur content of at least 0.07% by mass, and having a 90% distillation temperature of no higher than 370.0° C., and a density (15° C.) of no higher than 0.9800 g/cm 3 .