Fuel oil base and aviation fuel composition containing same
The aviation fuel oil base of the present invention is obtained by hydrotreating an oil to be treated containing an oxygen-containing hydrocarbon compound derived from an animal or vegetable oils and fat and a sulfur-containing hydrocarbon compound and then hydroisomerizing the resultant hydrotreated oil, wherein a yield of a fraction having a boiling range of 140 to 300° C. is 70 mass % or more; an isoparaffin content is 80 mass % or more; a content of isoparaffin having 2 or more branches is 17 mass % or more; an aromatic content is less than 0.1 vol %; an olefin content is less than 0.1 vol %; a sulfur content is less than 1 mass ppm; and an oxygen content is less than 0.1 mass %.
1. A method for manufacturing an aviation fuel oil base comprising:
hydrotreating an oil, containing an oxygen-containing hydrocarbon compound, which is derived from an animal or vegetable oil and fat and a sulfur-containing hydrocarbon compound with a catalyst prepared by supporting at least one metal selected from the elements of groups 6A and 8 of the periodic table on a support formed of a porous inorganic oxide composed of two or more elements selected from aluminum, silicon, zirconium, boron, titanium, and magnesium, under conditions of a hydrogen pressure of 2 to 13 MPa, a liquid hourly space velocity of 0.1 to 3.0 h −1 , a hydrogen/oil ratio of 150 to 1500 NL/L, and a reaction temperature of 150 to 480° C. in the presence of hydrogen to obtain a resultant hydrotreated oil,
adding a recycled oil being a part of the resultant hydrotreated oil to the oil to be hydrotreated in an amount of 0.5 to 5 times by mass relative to the oxygen-containing hydrocarbon compound derived from an animal or vegetable oil and fat, and then
hydroisomerizing the resultant hydrotreated oil with a catalyst prepared by supporting a metal selected from the elements of group 8 of the periodic table on a support formed of a porous inorganic oxide composed of a substance selected from aluminum, silicon, zirconium, boron, titanium, magnesium, and zeolite, under conditions of a hydrogen pressure of 1 to 5 MPa, a liquid hourly space velocity of 0.1 to 3.0 h −1 , a hydrogen/oil ratio of 250 to 1500 NL/L, and a reaction temperature of 200 to 360° C. in the presence of hydrogen.
2. The method for manufacturing an aviation fuel oil base as recited in claim 1 , wherein the oil to be hydrotreated contains a petroleum-based base oil.
3. The method for manufacturing an aviation fuel oil base according to claim 1 , wherein the aviation fuel oil base comprises:
a yield of a fraction having a boiling range of 140 to 300° C. of 70% by mass or more;
an isoparaffin content of 80% by mass or more;
a content of isoparaffin having 2 or more branches of 17% by mass or more;
an aromatic content of less than 0.1 vol %;
an olefin content of less than 0.1 vol %;
a sulfur content of less than 1 mass ppm; and
an oxygen content of less than 0.1% by mass.
4. The method for manufacturing an aviation fuel oil base according to claim 1 , wherein a sulfur content contained in the oil to be hydrotreated is 1 to 50 mass ppm in terms of a sulfur atom based on a total amount of the oil to be hydrotreated.