Method for producing aviation fuel oil base and aviation fuel oil composition
A method for producing an aviation fuel oil base, including: a first step of obtaining a first generated oil by hydrotreating a feedstock by bringing a feedstock which includes an oxygen-containing hydrocarbon compound derived from an animal or vegetable oils and fat into contact with a first dual functional catalyst which has dehydrogenation and hydrogenation functions and which includes a metal of group 6B of the periodic table, a metal of group 8, and an amorphous solid acidic substance, in the presence of hydrogen; and a second step of obtaining a second generated oil including an aviation fuel oil base by hydroisomerizing the first generated oil by bringing the first generated oil into contact with a second dual functional catalyst which has dehydrogenation and hydrogenation functions and which includes a metal of the group 8 of the periodic table and a crystalline solid acidic substance, in the presence of hydrogen.
1. A method for producing an aviation fuel oil base, comprising:
first obtaining a first generated oil by hydrotreating a feedstock which contains an oxygen-containing hydrocarbon compound derived from an animal or vegetable oils and fat by bringing the feedstock into contact with a first dual functional catalyst which has dehydrogenation and hydrogenation functions and which comprises a metal of group 6B of the periodic table, a metal of group 8, and an amorphous solid acidic substance, in the presence of hydrogen, wherein the feedstock contains 1 to 100 mass ppm in terms of sulfur atoms of a sulfur-containing hydrocarbon compound, and wherein the sulfur content included in the first generated oil is 10 mass ppm or less; and
then obtaining a second generated oil comprising an aviation fuel oil base by hydroisomerizing the first generated oil by bringing the first generated oil into contact with a second dual functional catalyst which has dehydrogenation and hydrogenation functions and which comprises a metal of group 8 of the periodic table and a crystalline solid acidic substance, in the presence of hydrogen;
wherein the cracking ratio is no greater than 20 mass % when obtaining the second generated oil by hydroisomerizing the first oil.
2. The method for producing an aviation fuel oil base according to claim 1 , wherein the metal of group 6B of the periodic table in the first dual functional catalyst is molybdenum and/or tungsten, and
the metal of group 8 of the periodic table in the first dual functional catalyst is cobalt and/or nickel, and
wherein the method comprises sulfiding the first dual functional catalyst, before the bringing the feedstock into contact with a first dual functional catalyst.
3. The method for producing an aviation fuel oil base according to claim 1 , wherein the crystalline solid acidic substance in the second dual functional catalyst is a crystalline substance comprising at least one crystal selected from the group consisting of a one-dimensional, 10-member ring aluminosilicate having an MEL structure, a TON structure, an MTT structure, and an MRE structure, and a silicoaluminophosphate having an AEL structure.
4. The method for producing an aviation fuel oil base according to claim 1 , wherein
the crystalline solid acidic substance in the second dual functional catalyst comprises a one-dimensional, 10-member ring aluminosilicate and/or a silicoaluminophosphate, and
a total content of the one-dimensional, 10-member ring aluminosilicate and the silicoaluminophosphate is 65 to 85 mass %.
5. The method for producing an aviation fuel oil base according to claim 3 , wherein the one-dimensional, 10-member ring aluminosilicate comprises at least one selected from the group consisting of ZSM-11, ZSM-22, ZSM-23, and ZSM-48, and
the silicoaluminophosphate comprises at least one selected from the group consisting of SAPO-11 and SAPO-34.
6. The method for producing an aviation fuel oil base according to claim 1 , wherein a hydroisomerization ratio exceeds 90 mass %.
7. An aviation fuel oil composition, containing a first aviation fuel oil base obtained by the method for producing an aviation fuel oil base according to claim 1 and a second aviation fuel oil base produced from a petroleum-based feedstock, wherein
a content of the first aviation fuel oil base is 5 to 50 mass % and a content of the second aviation fuel oil base is 50 to 95 mass %.
8. The method for producing an aviation fuel oil base according to claim 4 , wherein the one-dimensional, 10-member ring aluminosilicate comprises at least one selected from the group consisting of ZSM-11, ZSM-22, ZSM-23, and ZSM-48, and
the silicoaluminophosphate comprises at least one selected from the group consisting of SAPO-11 and SAPO-34.
9. An aviation fuel oil composition, containing a first aviation fuel oil base obtained by the method for producing an aviation fuel oil base according to claim 1 and a second aviation fuel oil base produced from a petroleum-based feedstock, wherein
a content of the first aviation fuel oil base is 5 to 50 mass % and a content of the second aviation fuel oil base is 50 to 95 mass %.