Hydrotreating method
To provide a method for hydrotreating a synthetic hydrocarbon oil, which removes olefins and oxygen-containing compounds by hydrotreatment with the gasification rate restrained and can efficiently convert the synthetic hydrocarbon oil generated by the FT process to a liquid fuel suitable as a fuel for diesel-powered vehicles. A hydrotreating method is disclosed in which a synthetic hydrocarbon oil generated by FT synthesis is hydrotreated using a catalyst in which a definite catalytic metal is allowed to be carried on a support, under definite reaction conditions, with the gasification rate restrained to a definite value or less, thereby removing the olefins and the oxygen-containing compounds.
1. A hydrotreating method, wherein a synthetic hydrocarbon oil generated by Fischer-Tropsch synthesis and containing 50% or more by mass of normal paraffin having 4 to 100 carbon number, 0.01% or more by mass of oxygen-containing compounds, by the oxygen mass ratio on an anhydrous basis, and 0.1% or more by mass of olefins and having a boiling point range of 30 to 360° C. is treated, using a catalyst in which nickel and optionally one or both of platinum and palladium are contained on a support comprising diatomaceous earth and optionally one or more of silica-magnesia, alumina and activated carbon, wherein the catalyst has a specific surface area of 100 m 2 /g or more, and a pore volume of from 0.05 to 1.2 mL/g under conditions of a hydrogen partial pressure of 0.1 to 20 MPa, a liquid hourly space velocity of 0.1 to 3 h −1 , a hydrogen/oil ratio of 50 to 2000 L/L and a gasification rate of 10% or less by mass, thereby removing the olefin and the oxygen-containing compound,
wherein
the nickel is contained in the support in an amount of 45-75% by mass, in terms of metal, on a catalyst basis, and
the synthetic hydrocarbon oil is treated at a temperature from 150 to 250° C.
2. The hydrotreating method according to claim 1 , wherein the support comprises alumina in addition to diatomaceous earth, and platinum is contained on the support in addition to nickel.
3. The hydrotreating method according to claim 1 , wherein the support comprises alumina in addition to diatomaceous earth, and palladium is contained on the support in addition to nickel.
4. The hydrotreating method according to claim 1 , wherein the support comprises silica-magnesia in addition to diatomaceous earth, and the synthetic hydrocarbon oil is treated at a temperature from 150 to 200° C.
5. The hydrotreating method according to claim 1 , wherein the support comprises activated carbon in addition to diatomaceous earth, and palladium is contained on the support in addition to nickel.
6. The hydrotreating method according to claim 1 , wherein platinum is contained on the support in addition to nickel, the platinum is contained in the support in an amount from 0.1-10% by mass, in terms of metal, on a catalyst basis, and the synthetic hydrocarbon oil is treated at a temperature from 180 to 240° C.
7. The hydrotreating method according to claim 1 , wherein palladium is contained on the support in addition to nickel, the palladium is contained in the support in an amount of 0.1-10% by mass, in terms of metal, on a catalyst basis, and the synthetic hydrocarbon oil is treated at a temperature from 180 to 240° C.