Patent ID: 8784645

Claim:
A method for manufacturing a hydrocarbon oil, comprising: a first step wherein a plurality of reaction zones filled with a catalyst which contains a porous inorganic oxide comprising two or more elements selected from aluminum, silicon, zirconium, boron, titanium and magnesium and one or more metals selected from Group 6A and Group 8 elements of the periodic table supported on the porous inorganic oxide is disposed in series and a feedstock oil containing an oxygen-containing hydrocarbon compound derived from an animal or vegetable oil is supplied and hydrotreated under the conditions of a hydrogen pressure of 1 MPa or more and less than 10 MPa in each of the reaction zones, and a ratio of hydrogen to oil (hydrogen/oil ratio) in the range of 100 to 1500 NL/L; and a second step wherein hydrogen, hydrogen sulfide, carbon dioxide and water are removed from a product to be treated obtained in the first step to obtain a hydrocarbon oil, wherein, among the plurality of reaction zones, the inlet temperature of the reaction zone disposed on the most upstream side is 150° C. or more and 250° C. or less, the inlet temperature of the second most upstream reaction zone or below is equal to or higher than the condensation temperature of water, the outlet temperature of the reaction zone disposed on the most downstream side is 260° C. or more and 360° C. or less, wherein if the number of the reaction zones in the first step is represented by n, where n is an integer of 2 or more, and the inlet temperature and the outlet temperature of the k th reaction zone from the most upstream side are re resented respectively by t k and T k where k is an integer of 2 to n, the relation between the partial pressure PW (in MPa) of the water produced as a by-product and the temperature t k (in ° C.) at that time satisfies the conditions represented b the following formula: PW < 6.11 ×10^{7.5× t k ÷( t k +237.3)}×10 −4 , and wherein the feedstock oil contains: a recycled oil in which a part of the hydrocarbon oil obtained in the second step is recycled and supplied in an amount of 0.5- to 5-fold by mass to the oxygen-containing hydrocarbon compound contained in the feedstock oil; and 1 to 50 ppm by mass of a sulfur-containing hydrocarbon compound in terms of the sulfur atom to the oxygen-containing hydrocarbon compound contained in the feedstock oil, wherein the sulfur-containing hydrocarbon compound is at least one selected from a sulfide, a disulfide, a polysulfide, a thiol, a thiophene, a benzothiophene, a dibenzothiophene, and a derivative thereof.