Diesel fuel oil composition

Abstract

To provide a diesel fuel oil composition that combines excellent ignition performance, combustion performance at low temperature, low-temperature fluidity, and fuel consumption performance.SOLUTION: A diesel fuel oil composition comprises a hydrotreated vegetable oil and at least one base material selected from desulfurized straight-run gas oil, dewaxed gas oil, and desulfurized kerosene, wherein a content of the hydrotreated vegetable oil based on a total amount of the composition is 0.1 volume percent or more and less than 70.0 volume percent, and the diesel fuel oil composition satisfies all of the following requirements: (1) a cetane number exceeding 58.0, (2) a pour point of -17.5°C or lower, (3) a cold filter plugging point of -10°C or lower, and (4) a gross calorific value exceeding 37000 J / cm3. A method for producing the diesel fuel oil composition is also provided.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a diesel fuel oil composition. [Background technology]

[0002] In recent years, efforts toward carbon neutrality have been accelerating, and attention has been drawn to the use of oil types other than fossil fuel-derived light oil fractions in fuel oil compositions, particularly diesel fuel oil compositions (also referred to as "light oil compositions"). As such oil types not derived from fossil fuels, diesel fuel oil compositions (light oil compositions) using biofuels such as fatty acid methyl esters (FAME) and oil types obtained by hydrogenating animal and vegetable oils have been proposed (see, for example, Patent Documents 1 and 2).

[0003] Patent Document 1 discloses a diesel fuel oil composition containing a fuel base stock A obtained by hydrodeoxygenating and isomerizing a feedstock containing animal and vegetable oils and / or components derived from animal and vegetable oils, and a fuel base stock B obtained by hydrotreating a blend of straight-run diesel and cracked diesel. Patent Document 2 also discloses a diesel oil composition containing an environmentally friendly diesel base stock produced from animal and vegetable oils and triglyceride-containing hydrocarbons, which are animal and vegetable-derived components, and which has a sulfur content, total acid number, filter plugging point, and other specified properties. [Prior art documents] [Patent documents]

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-089935 Patent Document 2: Japanese Patent Application Laid-Open No. 2009-040856 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, practical performance required of a diesel fuel oil composition includes, for example, ignition performance at engine start (hereinafter also simply referred to as "ignition performance") and low-temperature flow performance. Poor ignition performance can lead to events such as engine starting failure and diesel knock, while poor low-temperature flow performance can lead to problems such as solidification of wax in piping systems and even filter clogging. Therefore, ignition performance and low-temperature flow performance are extremely important performances of a diesel fuel oil composition.

[0006] The diesel fuel oil composition described in Patent Document 1 has a high cetane number of 58.5 to 65.4, resulting in excellent ignition performance, and a pour point of -22.5 to -20.0°C and a low filter plugging point of -15.0 to -14.0°C, resulting in excellent low-temperature flow performance. However, although isomerized jatropha oil (HBD: hydrogenated biodiesel) and desulfurized blended diesel oil (straight-run diesel and cracked diesel) are envisioned as the main oil types, no other oil types have been considered. From the perspective of ensuring a stable supply of diesel fuel oil compositions, it is important to develop diesel fuel oil compositions that incorporate a wider variety of oil types.

[0007] The diesel oil composition described in Patent Document 2 has a high cetane number of 59 to 60, giving it excellent ignition performance, but it has a high pour point of -7.5°C and a high plugging point of -7 to -5°C, so it cannot be said to be a composition with excellent low-temperature flow performance.

[0008] Another important practical requirement for diesel fuel oil compositions is low-temperature combustion performance. Hydrotreated vegetable oil (HVO) is a type of biofuel, and has an extremely high cetane number. Isomerized versions, in particular, have low pour points and filter plugging points, and are therefore generally known as base oils that combine ignition performance and low-temperature flow performance. The present inventors conducted more detailed research into the properties of hydrotreated vegetable oil and found that it is extremely effective in improving not only the ignition performance and low-temperature flow performance, but also combustion performance at low temperatures. In contrast, the compositions described in Patent Documents 1 and 2 do not address low-temperature combustion performance at all, nor do they consider the use of hydrotreated vegetable oil (HVO).

[0009] Furthermore, fuel economy is also an important practical performance required of a diesel fuel oil composition. To improve fuel economy, a high gross calorific value is required, but the diesel fuel oil compositions and light oil compositions described in Patent Documents 1 and 2 do not mention gross calorific values, and it is unclear what kind of fuel economy they have.

[0010] Regarding the gross calorific value, since hydrotreated vegetable oil (HVO) cannot be said to have a large gross calorific value, diesel fuel oil compositions containing hydrotreated vegetable oil (HVO) often face the challenge of increasing the gross calorific value and improving fuel economy. In other words, when hydrotreated vegetable oil is used as one of the base oils for a diesel fuel oil composition, there is a trade-off between obtaining excellent ignition performance and low-temperature flow performance and obtaining excellent fuel economy.

[0011] As described above, no conventional diesel fuel oil composition has been found to have excellent ignition performance, combustion performance at low temperatures, flow performance at low temperatures, and fuel economy performance, and there is an increasing demand for a composition that has all of these properties. The present inventors have investigated various oils that can be used in combination with hydrotreated vegetable oil and have found that by using at least one type of diesel oil, namely, desulfurized straight-run diesel oil and dewaxed diesel oil, it is possible to improve fuel economy while minimizing deterioration in ignition performance and low-temperature flow performance. Furthermore, the use of hydrotreated vegetable oil also makes it possible to improve combustion performance at low temperatures.

[0012] An object of the present invention is to provide a diesel fuel oil composition that combines excellent ignition performance, combustion performance at low temperatures, low-temperature flow performance, and fuel economy performance. [Means for solving the problem]

[0013] As a result of extensive research into solving the above problems, the present inventors have found that the problems can be solved by the following invention: That is, the present invention provides a diesel fuel oil composition having the following composition.

[0014] 1. A diesel fuel oil composition comprising a hydrotreated vegetable oil and at least one base material selected from desulfurized straight-run diesel oil, dewaxed diesel oil and desulfurized kerosene, wherein the content of the hydrotreated vegetable oil based on the total amount of the composition is 0.1% by volume or more and less than 70.0% by volume, and wherein the diesel fuel oil composition satisfies all of the following (1) to (4): A diesel fuel oil composition comprising a hydrotreated vegetable oil and at least one diesel oil selected from desulfurized straight-run diesel oil and dewaxed diesel oil, and wherein the diesel fuel oil composition satisfies all of the following (1) to (4): (1) Cetane number exceeds 58.0 (2) Pour point is -17.5°C or less (3) Clogging point is -10°C or less (4) Total calorific value is 37,000 J / cm 3 super 2. The diesel fuel oil composition according to the above item 1, wherein the hydrotreated vegetable oil satisfies all of the following (a1) to (a4): (a1) Cetane number is 60.0 or more and 85.0 or less (a2) Pour point is -60.0℃ or higher and 0.0℃ or lower (a3) The clogging point is between -50.0°C and 0.0°C. (a4) Total heat output is 36000J / cm 3 End 3. The diesel fuel oil composition according to 1 or 2 above, wherein the desulfurized straight-run diesel oil satisfies all of the following (b1) to (b4): (b1) Cetane number is 40.0 or more and 70.0 or less (b2) Pour point is -20.0℃ or more and 5.0℃ or less (b3) The clogging point is between -15.0°C and 5.0°C. (b4) Total heat output is 37500 J / cm 3 End 4. A diesel fuel oil composition as set forth in any one of 1 to 3 above, wherein the dewaxed light oil satisfies all of the following (c1) to (c4): (c1) Cetane number is 40.0 or more and 70.0 or less (c2) Pour point is -25.0℃ or more and -5.0℃ or less (c3) Clogging point is between -25.0°C and -5.0°C (c4) Total heat output is 38,000 J / cm 3 End 5. A diesel fuel oil composition according to any one of the above items 1 to 4, wherein the desulfurized kerosene satisfies all of the following (d1) to (d4): (d1) Cetane number is 30.0 or more and 60.0 or less (d2) Pour point is -70.0°C or higher and -20.0°C or lower (d3) Clogging point is -70.0°C or higher and -20.0°C or lower (d4) Total heat output is 36,300 J / cm 3 End 6. The diesel fuel oil composition according to any one of the above 1 to 5, further comprising a flow improver. 7. A method for producing a diesel fuel oil composition, which comprises mixing a hydrotreated vegetable oil with at least one base material selected from desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene so that the content of the hydrotreated vegetable oil in the total composition is 0.1% by volume or more but less than 70.0% by volume, and which satisfies all of the following (1) to (4): (1) Cetane number exceeds 58.0 (2) Pour point is -17.5°C or less (3) Clogging point is -10°C or less (4) Total calorific value is 37,000 J / cm 3 super [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a diesel fuel oil composition that combines excellent ignition performance, combustion performance at low temperatures, low-temperature flow performance, and fuel economy performance. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a diesel fuel oil composition according to an embodiment of the present invention (hereinafter, sometimes simply referred to as "the present embodiment") will be specifically described. Note that the present invention is not limited to the following embodiment, and can be practiced with any modifications within the scope that does not impair the effects of the invention. In addition, in this specification, the numerical values ​​associated with "greater than or equal to," "less than or equal to," and "to" in describing a numerical range are numerical values ​​that can be arbitrarily combined. For example, when a certain numerical range is described as "A to B" and "C to D," the numerical ranges "A to D" and "C to B" are also included.

[0017] [Diesel fuel oil composition] A diesel fuel oil composition according to an embodiment of the present invention (hereinafter sometimes simply referred to as this embodiment) comprises a hydrotreated vegetable oil and at least one base material selected from desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene, wherein the content of the hydrotreated vegetable oil based on the total amount of the composition is 0.1% by volume or more and less than 70.0% by volume, and the diesel fuel oil composition satisfies all of the following (1) to (4): (1) Cetane number exceeds 58.0 (2) Pour point is -17.5°C or less (3) Clogging point is -10°C or less (4) Total calorific value is 37,000 J / cm 3 super

[0018] First, the properties of the diesel fuel oil composition of this embodiment will be described.

[0019] (1) Cetane number The cetane number of the diesel fuel oil composition of this embodiment is greater than 58.0. If it is 58.0 or less, excellent ignition performance will not be exhibited. From the viewpoint of improving ignition performance, the cetane number is preferably 58.5 or more, more preferably 59.5 or more, even more preferably 61.0 or more, and still more preferably 66.0 or more, with the upper limit usually being 75.0 or less, preferably 70.0 or less. In this specification, the cetane number is a value determined in accordance with JIS K 2280-4:2013 (Petroleum products -- Determination of octane number, cetane number and cetane index -- Part 4: Cetane number).

[0020] (2) Pour point The pour point of the diesel fuel oil composition of this embodiment is −17.5° C. or lower. If the pour point exceeds −17.5° C., excellent low-temperature flow performance will not be exhibited. From the viewpoint of improving low-temperature flow performance, the pour point is preferably −20.0 or lower, more preferably −25.0 or lower, and there is no particular lower limit, but it is usually −40.0 or higher. In this specification, the pour point is a value measured in accordance with JIS K 2269:1987 (Testing method for pour point and cloud point of crude oil and petroleum products).

[0021] (3) Clogging point The plugging point of the diesel fuel oil composition of this embodiment is -10°C or lower. If it exceeds -10°C, excellent low-temperature flow performance will not be exhibited. From the viewpoint of improving low-temperature flow performance, the plugging point is preferably -13°C or lower, more preferably -15°C or lower, and even more preferably -21°C or lower, and there is no particular lower limit, but it is usually -40°C or higher. In this specification, the pour point is a value measured in accordance with JIS K2288:2011 (Petroleum products - Light oil - Test method for clogging point).

[0022] (4) Total heat generation The total calorific value of the diesel fuel oil composition of this embodiment is 37000 J / cm 3 It is over 37000J / cm 3If it is less than this, excellent fuel economy performance cannot be obtained. From the viewpoint of improving fuel economy performance, the total calorific value is preferably 37100 J / cm 3 More preferably, 37150 J / cm 3 More preferably, 37350 J / cm 3 There is no particular upper limit, and it is usually 39,000 J / cm 3 The following is the result. In this specification, the gross calorific value is a value measured in accordance with JIS K2279:2003 (Crude oil and petroleum products - Calorific value test method and method for estimating by calculation) and estimated (using the calculation formula for crude oil, kerosene, diesel, heavy oil A and heavy oil B specified in "6. Gross calorific value estimation method, 6.3 e)1)").

[0023] In addition to the properties (1) to (4) above, the diesel fuel oil composition of this embodiment preferably satisfies at least one selected from the following properties (5) to (13), and more preferably satisfies all of the following properties (5) to (13):

[0024] (5) Density at 15°C The density of the diesel fuel oil composition of this embodiment at 15°C is preferably 0.8000 g / cm 3 More preferably, 0.8020 g / cm 3 More preferably, 0.8100 g / cm 3 The upper limit is preferably 0.8600 g / cm 3 or less, more preferably 0.8400 g / cm 3 More preferably, 0.8380 g / cm or less 3 or less, even more preferably 0.8250 g / cm 3 If the density at 15°C is within the above range, fuel economy is improved. In this specification, the density at 15°C is a value measured in accordance with JIS K 2249-1:2011 (Crude oil and petroleum products - Determination of density - Part 1: vibration method).

[0025] (6) Kinematic viscosity at 30°C The kinematic viscosity of the diesel fuel oil composition of this embodiment at 30°C is preferably 2.500 mm 2 / s or more, preferably 3,000 mm 2 / s or more, more preferably 3,500 mm 2 / s or more, and even more preferably 4,000 mm 2 / s or more, and the upper limit is preferably 4.700 mm 2 / s or less, preferably 4.600 mm 2 / s or less, more preferably 4.550 mm 2 If the kinematic viscosity at 30°C is within the above range, the composition is more easily adapted to the range of use of various devices such as pumps and flow meters, and the lubricity is improved. In this specification, the kinematic viscosity at 30°C is a value measured in accordance with JIS K 2283:2000 (Testing method for kinematic viscosity of crude oil and petroleum products).

[0026] (7) Sulfur content The sulfur content of the diesel fuel oil composition of this embodiment is preferably as low as possible, more specifically, preferably 0.0010% by mass or less, more preferably 0.0008% by mass or less, and even more preferably 0.0006% by mass or less, and there is no particular lower limit, but it is usually 0.00001% by mass or more. If the sulfur content is within the above range, the burden on the environment can be reduced, thereby improving environmental performance, and sulfur oxides in exhaust gas can be reduced, thereby making it possible to suppress corrosion. In this specification, the sulfur content is a value measured in accordance with JIS K 2541-6:2013 (Crude oil and petroleum products - Determination of sulfur content - Part 6: ultraviolet fluorescence method).

[0027] (8) Flash point The flash point of the diesel fuel oil composition of this embodiment is preferably 55.0° C. or higher, more preferably 60.0° C. or higher, and even more preferably 75.0° C. or higher, and there is no particular upper limit, but it is usually 85.0° C. or lower. If the flash point is within the above range, safety in handling can be improved. In this specification, the flash points of oils other than the hydrotreated vegetable oils described below are values ​​measured in accordance with JIS K 2265-3:2007 (Crude oil and petroleum products - Flash point test method - Part 3: Pensky-Martens closed-circuit method).

[0028] (9) Cloud point The cloud point of the diesel fuel oil composition of this embodiment is preferably −5° C. or lower, more preferably −10° C. or lower, and even more preferably −18° C. or lower, and there is no particular lower limit, but it is usually −30° C. or higher. When the cloud point is within the above range, low-temperature flow performance is improved, and it becomes possible to suppress filter clogging due to precipitated wax without the need for equipment measures such as heat retention. In this specification, the cloud point is a value measured in accordance with JIS K 2269:1987 (Testing method for pour point and cloud point of crude oil and petroleum products).

[0029] (10) Saturated content The saturated matter content of the diesel fuel oil composition of this embodiment is preferably 70.0% by volume or more, more preferably 76.0% by volume or more, and even more preferably 80.0% by volume or more, with the upper limit being preferably 91.0% by volume or less, more preferably 89.0% by volume or less, and even more preferably 88.0% by volume or less. When the saturated matter content is within the above range, a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance is achieved. In this specification, the saturated content and aromatic content are values ​​measured by the High Performance Liquid Chromatography method in Petroleum Products - Hydrocarbon Type Testing Method, as specified in JPI-5S-49-2007.

[0030] (11) Aromatic content The saturated content of the diesel fuel oil composition of this embodiment is preferably 8.0% by volume or more, more preferably 10.0% by volume or more, and even more preferably 12.0% by volume or more, with the upper limit being preferably 28.0% by volume or less, more preferably 24.0% by volume or less, and even more preferably 20.0% by volume or less. When the aromatic content is within the above range, a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance is achieved.

[0031] (12) Distillation properties Regarding the distillation properties of the diesel fuel oil composition of this embodiment, the 10% by volume distillation temperature is preferably 175.0°C or higher, more preferably 200.0°C or higher, and even more preferably 230.0°C or higher, with the upper limit being preferably 260.0°C or lower, more preferably 250.0°C or lower, and even more preferably 245.0°C or lower. The 50% by volume distillation temperature is preferably 240.0°C or higher, more preferably 260.0°C or higher, and even more preferably 275.0°C or higher, with the upper limit being preferably 310.0°C or lower, more preferably 230.0°C or lower, and even more preferably 290.0°C or lower. The 90% by volume distillation temperature is preferably 300.0°C or higher, more preferably 310.0°C or higher, and even more preferably 330.0°C or higher, with the upper limit being preferably 370.0°C or lower, more preferably 360.0°C or lower, and even more preferably 350.0°C or lower. When the distillation properties of the diesel fuel oil composition of this embodiment are the above-mentioned 10% by volume distillation temperature, 50% by volume distillation temperature, and 90% by volume distillation temperature, the effects of low-boiling point components and high-boiling point components are suppressed, and combustion performance is improved. In this specification, the 10% by volume distillation temperature, 50% by volume distillation temperature, and 90% by volume distillation temperature of the distillation properties are values ​​measured in accordance with JIS K2254:2018 (Petroleum products - Determination of distillation properties - (atmospheric pressure method)).

[0032] (13) Average THC concentration at -10°C The average THC (total hydrocarbon) concentration at -10°C of the diesel fuel oil composition of this embodiment (hereinafter also simply referred to as "THC concentration") is preferably 1100 ppm by mass or less, more preferably 950 ppm by mass or less, even more preferably 800 ppm by mass or less, still more preferably 600 ppm by mass or less, and particularly preferably 525 ppm by mass or less, with no particular lower limit, and typically 350 ppm by mass or more. The average THC concentration at -10°C of the diesel fuel oil composition of this embodiment (THC concentration) falls within the above range, and the composition has excellent combustion performance at low temperatures. The average THC concentration (THC concentration) at -10°C is the average value of the concentration of all hydrocarbons in the exhaust gas during the accelerated test, and is a measurement value measured using the following measurement method. (THC measurement method) A vehicle (see "Vehicle Specifications" below) was used and placed on a chassis dynamometer. After soaking, the vehicle was run at idle for two hours to allow total hydrocarbons to accumulate in the aftertreatment catalyst, and then accelerated to maintain a constant speed (100 km / h, accelerator opening: 50%). During the acceleration test at a constant speed, total hydrocarbons were measured for the emitted exhaust gas (exhaust gas after passing through the aftertreatment device) using an engine exhaust gas measuring device ("META-ONE (product name)" manufactured by Horiba, Ltd.), and white smoke was visually observed by passing the exhaust gas through a white smoke observation box. The running test was terminated when white smoke could no longer be visually confirmed. Vehicle specifications; Year: 2018 Displacement: 3,000cc Exhaust gas regulations: Post-new long-term Authentication mode: JC08 mode Compression ratio: 15.0

[0033] [Hydrotreated vegetable oil (HVO)] The hydrotreated vegetable oil (also referred to as "HVO: Hydrotreated Vegetable Oil") contained in the diesel fuel oil composition of this embodiment is one type of biofuel obtained by hydrodeoxygenating a raw material containing at least one selected from animal and vegetable oils and components derived from animal and vegetable oils. The hydrotreated vegetable oil used in this embodiment may also be one that has been further isomerized.

[0034] (Raw material containing at least one selected from animal and vegetable oils and components derived from animal and vegetable oils) In this specification, animal and vegetable oils and fats refer to oils and fats obtained by squeezing animal and vegetable raw materials or extracting them with organic solvents, and those obtained from plants are called vegetable oils and fats, and those obtained from animals are called animal oils and fats, and these are collectively called animal and vegetable oils and fats. Examples of animal and vegetable fats and oils and components derived from animal and vegetable fats and oils include vegetable oils such as coconut oil, palm kernel oil, palm oil, cocoa butter, linseed oil, safflower oil, sesame seed oil, tung oil, cottonseed oil, rapeseed oil, sesame oil, corn oil, soybean oil, sunflower oil, kapok oil, olive oil, mustard oil, peanut oil, castor oil, camellia oil, jatropha oil, camelina oil, carinata oil, mandari oil, and oils derived from microalgae; and animal fats and oils such as cow's milk fat, goat's milk fat, buffalo milk fat, beef tallow, lard, mutton tallow, fish oil, liver oil, and cow's foot oil. These can be used alone or in combination of two or more. Furthermore, the animal and vegetable oils and components derived therefrom also include waste oils obtained after using these animal and vegetable oils and components derived therefrom for consumer, industrial, edible, etc. In this case, it is preferable to use the waste oil from which impurities have been removed.

[0035] As the animal and vegetable oils and components derived from ...

[0036] Furthermore, as the animal and vegetable oils and fats and components derived from animal and vegetable oils and fats, oils derived from microalgae can also be preferably used. The term "microalgae" in the context of microalgae-derived oils refers to algae that have the ability to convert some of their nutrients into hydrocarbons or oils, such as Aurantiochytrium, Botryococcus braunii, Pseudochoricystis ellipsoidea, Pseudococomyxa, Chlorella, Cassia gracilis, Spirulina, Euglena, Solaris, and Nannochloropsis.

[0037] The animal and vegetable oils and components derived from animal and vegetable oils are primarily composed of at least one fatty acid and its derivative selected from fatty acid triglycerides, fatty acid diglycerides, fatty acid monoglycerides, (free) fatty acids, and fatty acid esters. The number of carbon atoms in the fatty acid moiety of these fatty acids and their derivatives is preferably 12 or more, more preferably 16 or more, with the upper limit being preferably 24 or less, more preferably 18 or less. When the carbon number is within the above range, a high cetane index and excellent low-temperature flow performance can be obtained, and diesel fuel specifications can be easily met. Furthermore, the yield of fuel base stock can be increased by hydrodeoxygenation treatment.

[0038] (hydrodeoxygenation treatment) The hydrodeoxygenation catalyst used in the hydrodeoxygenation treatment of the raw material is preferably a catalyst support having at least one metal selected from elements of Group 6A and Group 8 supported thereon. Phosphorus may also be supported on the catalyst support, or phosphorus may be contained in the active metal impregnation solution. Preferred examples of the at least one metal selected from the elements of Group 6A and Group 8 include nickel, cobalt, molybdenum, and tungsten, and preferred examples of combinations thereof include Ni-Mo, Ni-W, Co-Mo, and Ni-Co-Mo.

[0039] The amount of nickel or cobalt supported in the hydrodeoxygenation catalyst is preferably 1% by mass or more and 10% by mass or less, the amount of molybdenum or tungsten supported in the hydrodeoxygenation catalyst is preferably 10% by mass or more and 40% by mass or less, and the amount of phosphorus supported in the hydrodeoxygenation catalyst is preferably 1% by mass or more and 10% by mass or less, based on the oxides.

[0040] The catalyst support preferably contains 50 mass % or more of alumina, and the alumina is preferably γ-alumina. The catalyst support may further contain titania.

[0041] As a method for supporting at least one metal selected from the elements of Groups 6A and 8 on a catalyst support, an impregnation method is preferably used. When a metal is supported by impregnation, preferred compounds include nickel compounds such as nickel carbonate, basic nickel carbonate, and nickel nitrate; cobalt compounds such as cobalt carbonate, basic cobalt carbonate, and cobalt nitrate; molybdenum compounds such as molybdenum trioxide and ammonium molybdate; tungsten compounds such as tungsten trioxide and ammonium tungstate; and phosphorus compounds such as phosphorus pentoxide and orthophosphoric acid. These compounds may be used alone or in combination.

[0042] Before using the hydrodeoxygenation catalyst, the hydrodeoxygenation catalyst may be reduced under hydrogen. The conditions for reduction under hydrogen are preferably a reduction temperature of 300°C or higher and 400°C or lower, and a reduction time of 1 hour or higher and 36 hours or lower.

[0043] The hydrodeoxygenation catalyst may be sulfurized in the reaction system before use. Examples of methods for sulfurizing the hydrodeoxygenation catalyst include liquid-phase sulfurization, in which a sulfiding agent such as dimethyl disulfide is mixed with the raw material and the mixture is fed to the catalyst, and gas-phase sulfurization, in which an H2S mixed gas is fed.

[0044] From the viewpoint of the energy efficiency of the hydrodeoxygenation treatment, the pressure in the hydrodeoxygenation treatment is preferably 2 MPa or more, more preferably 3 MPa or more, and the upper limit is preferably 8 MPa or less, more preferably 7 MPa or less. The reaction temperature is preferably 250°C or more, more preferably 330°C or more, and the upper limit is preferably 450°C or less, more preferably 400°C or less.

[0045] From the same viewpoint, the liquid hourly space velocity (LHSV) is preferably 0.2 hr -1 More than 0.3 hours, preferably 0.3 hours -1 The upper limit is preferably 3.0 hours. -1 More preferably, it is 2.0 hours or less. -1 The hydrogen / oil ratio is preferably 1000 Nm 3 / kL or more, preferably 1500Nm 3 / kL or more, more preferably 1800Nm 3 / kL or more, and the upper limit is preferably 3000 Nm 3 / kL or less, preferably 2500Nm 3 / kL or less, more preferably 2200Nm 3 / kL or less.

[0046] (Isomerization treatment) As mentioned above, a hydrodeoxygenated feedstock may be isomerized for use. Isomerization refers to a process in which an isomerization reaction is carried out to branch the long-chain hydrocarbon moiety derived from the fatty acid moiety of the fatty acid derivative contained in the feedstock. This process can improve the low-temperature performance of the hydrodeoxygenated feedstock.

[0047] The isomerization catalyst used in the isomerization treatment is preferably a catalyst carrier having at least one metal selected from the elements of Groups 8 to 10 supported thereon. As the elements of Groups 8 to 10 used in the isomerization catalyst, the platinum group elements ruthenium, rhodium, palladium, osmium, iridium, and platinum are preferred, and among these, palladium and platinum of Group 10 are more preferred.

[0048] The amount of the metal element supported in the isomerization catalyst is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, with the upper limit being preferably 5% by mass or less, more preferably 1.5% by mass.

[0049] The catalyst support is preferably a support having acidic properties, and examples thereof include alumina, zeolite, silica alumina, alumina boria, alumina titania, silica zirconia, silicoaluminophosphate, etc. These supports may be used alone or in combination of two or more. The catalyst carrier may be in the form of a powder or a molded body such as a cylinder, a three-leaf leaf, or a four-leaf leaf.

[0050] As a method for supporting at least one metal selected from the elements of Groups 8 to 10 on a catalyst support, an impregnation method is preferably used. Compounds containing the above metal element components used in the impregnation method include various metal salts such as hydrochlorides, sulfates, nitrates, complex compounds, and chlorides. For example, ruthenium compounds such as ruthenium chloride, ruthenium nitrate, ruthenium nitrosylnitrate, and tris(acetylacetonato)ruthenium; rhodium compounds such as rhodium chloride, rhodium nitrate, rhodium acetate, and rhodium sulfate; palladium compounds such as palladium chloride, sodium chloropalladate, palladium nitrate, palladium sulfate, palladium acetate, and palladium propionate; palladium compounds such as osmium chloride and hexachloroosmate; iridium compounds such as iridium chloride and hexachloroiridate; and platinum compounds such as platinum nitrate, platinum sulfate, chloroplatinic acid, tetrachloroplatinic acid, tetraammineplatinum chloride, tetraammineplatinum nitrate, tetraammineplatinum acetate, tetraammineplatinum carbonate, dichlorotetraammineplatinum, dinitrodiammineplatinum, dinitrodiammineplatinum nitrate, and potassium hexachloroplatinate may be used. These compounds may be used alone or in combination.

[0051] Before using the isomerization catalyst, the isomerization catalyst may be reduced under hydrogen. The conditions for reduction under hydrogen are that the reduction temperature is preferably 200°C or higher, more preferably 250°C or higher, and the upper limit is preferably 500°C or lower, more preferably 400°C or lower. The reduction time is preferably 1 hour or longer and 36 hours or shorter.

[0052] Although the isomerization reaction proceeds substantially without hydrogen, it is preferable to carry out the isomerization reaction in the presence of hydrogen in order to prevent coke deterioration of the isomerization catalyst. From the viewpoints of obtaining excellent low-temperature flow performance and energy efficiency of the isomerization treatment, the pressure in the isomerization treatment is preferably 1.5 MPa or more, more preferably 2 MPa or more, with an upper limit of preferably 7 MPa or less, more preferably 5 MPa or less. The reaction temperature is preferably 200°C or more, more preferably 250°C or more, with an upper limit of preferably 460°C or less, more preferably 360°C or less.

[0053] From the same viewpoint, the liquid hourly space velocity (LHSV) is preferably 0.2 hr -1 More than 0.3 hours, preferably 0.3 hours -1 The upper limit is preferably 3.0 hours. -1 More preferably, it is 2.0 hours or less. -1 The hydrogen / oil ratio is preferably 150 Nm 3 / kL or more, preferably 500Nm 3 / kL or more, more preferably 900Nm 3 / kL or more, and the upper limit is preferably 1500 Nm 3 / kL or less, preferably 1300Nm 3 / kL or less, more preferably 1100Nm 3 / kL or less.

[0054] The properties of the hydrotreated vegetable oil (HVO) preferably satisfy all of the following (a1) to (a4). (a1) Cetane number is 60.0 or more and 85.0 or less (a2) Pour point is -60.0℃ or higher and 0.0℃ or lower (a3) The clogging point is between -50.0°C and 0.0°C. (a4) Total heat output is 36000J / cm 3 End

[0055] (a1) Cetane number The cetane number of the hydrotreated vegetable oil (HVO) is preferably 60.0 or more, more preferably 65.0 or more, and even more preferably 70.0 or more, and there is no particular upper limit, but it is usually 85.0 or less. When the cetane number of the hydrotreated vegetable oil (HVO) is within the above range, the cetane number of the diesel fuel oil composition of this embodiment is likely to exceed 58.0, and excellent ignition performance can be obtained.

[0056] (a2) Pour point The pour point of the hydrotreated vegetable oil (HVO) is preferably 0.0° C. or lower, more preferably −15.0° C. or lower, even more preferably −30.0° C. or lower, and even more preferably −45.0° C. or lower, and there is no particular lower limit, but it is usually −60.0° C. or higher. When the pour point of the hydrotreated vegetable oil (HVO) is within the above range, the pour point of the diesel fuel oil composition of this embodiment is likely to be −17.5° C. or lower, and excellent low-temperature flow performance can be obtained.

[0057] (a3) Clogging point The filter plugging point of the hydrotreated vegetable oil (HVO) is preferably 0.0° C. or lower, more preferably −15.0° C. or lower, and even more preferably −30.0° C. or lower, and there is no particular lower limit, but it is usually −50.0° C. or higher. When the filter plugging point of the hydrotreated vegetable oil (HVO) is within the above range, the filter plugging point of the diesel fuel oil composition of this embodiment is likely to be −10° C. or lower, and excellent low-temperature flow performance can be obtained.

[0058] (a4) Total heat generation The gross calorific value of the hydrotreated vegetable oil (HVO) is preferably 36000 J / cm 3 More preferably, 36100 J / cm 3 More preferably, 36250 J / cm 3 There is no upper limit, and it is usually 37500J / cm3 When the gross calorific value of the hydrotreated vegetable oil (HVO) is within the above range, the gross calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easy to achieve super high fuel efficiency.

[0059] Furthermore, the hydrotreated vegetable oil contained in the diesel fuel oil composition of this embodiment has the following properties (a5) to (a6) in addition to the properties (a1) to (a4) described above: 13 ) and preferably satisfies at least one of the following (a5) to (a 13 ) is more preferably satisfied.

[0060] (a5) Density at 15°C The density of the hydrotreated vegetable oil (HVO) at 15°C is preferably 0.7600 g / cm 3 More preferably, 0.7700 g / cm 3 More preferably, 0.7750 g / cm 3 The upper limit is preferably 0.8000 g / cm 3 or less, more preferably 0.7900 g / cm 3 or less, and more preferably 0.7850 g / cm 3 If the density of the hydrotreated vegetable oil (HVO) at 15°C is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easier to achieve ultra-low fuel consumption, improving fuel efficiency.

[0061] (a6) Kinematic viscosity at 30°C The kinematic viscosity of the hydrotreated vegetable oil (HVO) at 30°C is preferably 2.500 mm 2 / s or more, preferably 3,000 mm 2 / s or more, more preferably 3,500 mm 2 / s or more, and the upper limit is preferably 5,000 mm 2 / s or less, preferably 4.700 mm 2 / s or less, more preferably 4,500 mm 2If the kinematic viscosity at 30°C of the hydrotreated vegetable oil (HVO) is within the above range, the diesel fuel oil composition of this embodiment will be more easily suited to the ranges of use of various devices such as pumps and flow meters, and will also have improved lubricity.

[0062] (a7) Sulfur content The lower the sulfur content of the hydrotreated vegetable oil (HVO), the better, and more specifically, it is preferably 0.0003% by mass or less, more preferably 0.0002% by mass or less, even more preferably 0.0001% by mass or less, and even more preferably less than 0.0001% by mass. When the sulfur content of the hydrotreated vegetable oil (HVO) is within the above range, the environmental load of the diesel fuel oil composition of this embodiment can be reduced, thereby improving environmental performance, and sulfur oxides in exhaust gas can be reduced, making it possible to suppress corrosion.

[0063] (a8) Flash point The flash point of the hydrotreated vegetable oil (HVO) is preferably 65.0° C. or higher, more preferably 70.0° C. or higher, and even more preferably 75.0° C. or higher, with no particular upper limit, and is usually 90.0° C. or lower. When the flash point of the hydrotreated vegetable oil (HVO) is within the above range, the safety of handling the diesel fuel oil composition of this embodiment can be improved.

[0064] (a9) Cloud point The cloud point of the hydrotreated vegetable oil (HVO) is preferably −15° C. or lower, more preferably −20° C. or lower, and even more preferably −30° C. or lower, and there is no particular lower limit, but it is usually −50° C. or higher. When the cloud point of the hydrotreated vegetable oil (HVO) is within the above range, the low-temperature flow performance of the diesel fuel oil composition of this embodiment is improved, and it becomes possible to suppress filter clogging due to precipitated wax without the need for equipment measures such as heat retention.

[0065] (a 10 )Saturate content The saturated content of the hydrotreated vegetable oil (HVO) is preferably 80.0% by volume or more, more preferably 90.0% by volume or more, and even more preferably 95.0% by volume or more. When the saturated content of the hydrotreated vegetable oil (HVO) is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0066] (a 11 ) Aromatic content The aromatic content of the hydrotreated vegetable oil (HVO) is preferably 5.0% by volume or less, more preferably 1.0% by volume or less, and even more preferably 0.1% by volume or less. When the aromatic content of the hydrotreated vegetable oil (HVO) is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0067] (a 12 ) Normal paraffin concentration and isoparaffin concentration The normal paraffin concentration of the hydrotreated vegetable oil (HVO) is preferably 15.0% by volume or less, more preferably 12.5% ​​by volume or less, and even more preferably 10.0% by volume or less, with no particular lower limit and usually 1.0% by volume or more. The isoparaffin concentration is preferably 85.0% by volume or more, more preferably 87.5% by volume or more, and even more preferably 90.0% by volume or more, with no particular upper limit and usually 99.0% by volume or less. When the normal paraffin concentration and isoparaffin concentration of the hydrotreated vegetable oil (HVO) are within the above ranges, the hydrotreated vegetable oil (HVO) is more likely to satisfy the properties (a1) to (a4) above, and further, depending on the combination with other oil types, the diesel fuel oil composition of the present embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance. In this specification, the normal paraffin and isoparaffin concentrations were analyzed using a GC-FID with a nonpolar column, with GC conditions adjusted to match the measurement of HVO, in accordance with ASTM D5442. Splitless injection was used as the injection method, and concentrations were calculated by area distribution.

[0068] (a 13 ) Distillation properties As distillation properties of the hydrotreated vegetable oil (HVO), the 10% by volume distillation temperature is preferably 240.0°C or higher, more preferably 250.0°C or higher, with the upper limit being preferably 290.0°C or lower, more preferably 280.0°C or lower. The 50% by volume distillation temperature is preferably 250.0°C or higher, more preferably 265.0°C or higher, with the upper limit being preferably 320.0°C or lower, more preferably 300.0°C or lower. Furthermore, the 90% by volume distillation temperature is preferably 270.0°C or higher, more preferably 280.0°C or higher, with the upper limit being preferably 340.0°C or lower, more preferably 315.0°C or lower, and even more preferably 350.0°C or lower. When the hydrotreated vegetable oil (HVO) has the above-mentioned 10% by volume distillation temperature, 50% by volume distillation temperature, and 90% by volume distillation temperature, the effects of the low-boiling point components and high-boiling point components of the diesel fuel oil composition of this embodiment are suppressed, and combustion performance is improved.

[0069] (Hydrogenated vegetable oil (HVO) content) The content of hydrotreated vegetable oil (HVO) in the diesel fuel oil composition of this embodiment is 0.1% by volume or more and less than 70.0% by volume, based on the total amount of the composition. If the content of hydrotreated vegetable oil (HVO) is not within this range, a fuel oil composition that combines ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy cannot be obtained. From the viewpoint of improving the ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy of the diesel fuel oil composition of this embodiment in a balanced manner depending on the combination with other oil types, the content of hydrotreated vegetable oil (HVO) in the total amount of the composition is preferably 1.0% by volume or more, more preferably 2.5% by volume or more, even more preferably 5.0% by volume or more, still more preferably 15.0% by volume or more, and particularly preferably 25.0% by volume or more, with the upper limit being preferably 60.0% by volume or less, more preferably 55.0% by volume or less, and even more preferably 52.5% by volume or less.

[0070] [Desulfurized straight-run diesel] The diesel fuel oil composition of this embodiment contains at least one base material selected from the group consisting of desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene. Desulfurized straight-run diesel oil is a fraction obtained by desulfurizing a diesel fraction obtained by atmospheric distillation of crude oil in an atmospheric distillation unit. It is preferable that the desulfurized straight-run gas oil has properties that satisfy all of the following (b1) to (b4). (b1) Cetane number is 40.0 or more and 70.0 or less (b2) Pour point is -20.0℃ or more and 5.0℃ or less (b3) The clogging point is between -15.0°C and 5.0°C. (b4) Total heat output is 37500 J / cm 3 End

[0071] (b1) Cetane number The cetane number of the desulfurized straight-run diesel oil is preferably 40.0 or higher, more preferably 45.0 or higher, and even more preferably 50.0 or higher, with no particular upper limit, and is usually not higher than 70.0. When the cetane number of the desulfurized straight-run diesel oil is within the above range, the cetane number of the diesel fuel oil composition of this embodiment is likely to exceed 58.0, and excellent ignition performance can be obtained.

[0072] (b2) Pour point The pour point of the desulfurized straight-run gas oil is preferably 5.0° C. or lower, more preferably 0.0° C. or lower, and even more preferably −5.0° C. or lower, with no particular lower limit, and is usually −20.0° C. or higher. When the pour point of the desulfurized straight-run gas oil is within the above range, the pour point of the diesel fuel oil composition of this embodiment is likely to be −17.5° C. or lower, and excellent low-temperature flow performance can be obtained.

[0073] (b3) Clogging point The filter plugging point of the desulfurized straight-run gas oil is preferably 5.0° C. or lower, more preferably 0.0° C. or lower, and even more preferably −2.5° C. or lower, and there is no particular lower limit, but it is usually −15.0° C. or higher. When the filter plugging point of the desulfurized straight-run gas oil is within the above range, the filter plugging point of the diesel fuel oil composition of this embodiment is likely to be −10° C. or lower, and excellent low-temperature flow performance can be obtained.

[0074] (b4) Total heat generation The total calorific value of the desulfurized straight-run gas oil is preferably 37500 J / cm 3 More preferably, 37750 J / cm 3 More preferably, 37950 J / cm 3 There is no upper limit, and it is usually 38500J / cm 3 When the total calorific value of the desulfurized straight-run diesel oil is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easy to achieve super high fuel efficiency.

[0075] Furthermore, the desulfurized straight-run gas oil contained in the diesel fuel oil composition of this embodiment has the following properties (b5) to (b6) in addition to the properties (b1) to (b4) described above: 12 ) and preferably satisfies at least one of the following (b5) to (b 12 ) is preferably satisfied.

[0076] (b5) Density at 15°C The density of the desulfurized straight run gas oil at 15°C is preferably 0.8100 g / cm3 More preferably, 0.8200 g / cm 3 More preferably, 0.8250 g / cm 3 The upper limit is preferably 0.8500 g / cm 3 or less, more preferably 0.8400 g / cm 3 More preferably, it is 0.8350 g / cm or less. 3 If the density of the desulfurized straight-run diesel oil at 15°C is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easy to achieve super high fuel efficiency.

[0077] (b6) Kinematic viscosity at 30°C The kinematic viscosity of the desulfurized straight run gas oil at 30°C is preferably 2.500 mm 2 / s or more, preferably 3,000 mm 2 / s or more, more preferably 3,500 mm 2 / s or more, and the upper limit is preferably 5,000 mm 2 / s or less, preferably 4.700 mm 2 / s or less, more preferably 4,500 mm 2 If the kinematic viscosity at 30°C of the desulfurized straight-run diesel oil is within the above range, the diesel fuel oil composition of this embodiment will be more easily suited to the ranges of use of various devices such as pumps and flow meters, and will also have improved lubricity.

[0078] (b7) Sulfur content The lower the sulfur content of the desulfurized straight-run diesel oil, the better, and more specifically, it is preferably 0.0015% by mass or less, more preferably 0.0010% by mass or less, and even more preferably 0.0008% by mass or less. If the sulfur content of the desulfurized straight-run diesel oil is within the above range, the environmental load of the diesel fuel oil composition of this embodiment can be reduced, improving environmental performance, and sulfur oxides in exhaust gas can be reduced, making it possible to suppress corrosion.

[0079] (b8) Flash point The flash point of the desulfurized straight-run gas oil is preferably 60.0° C. or higher, more preferably 65.0° C. or higher, and even more preferably 70.0° C. or higher, with no particular upper limit, and is usually 90.0° C. or lower. If the flash point of the desulfurized straight-run gas oil is within the above range, the safety of handling the diesel fuel oil composition of this embodiment can be improved.

[0080] (b9) Cloud point The cloud point of the desulfurized straight-run gas oil is preferably −0° C. or lower, more preferably −1° C. or lower, and there is no particular lower limit, but it is usually −20° C. or higher. When the cloud point of the desulfurized straight-run gas oil is within the above range, the low-temperature flow performance of the diesel fuel oil composition of this embodiment is improved, and it becomes possible to suppress filter clogging due to precipitated wax without the need for equipment measures such as heat retention.

[0081] (b 10 )Saturate content The saturated matter content of the desulfurized straight-run diesel oil is preferably 60.0% by volume or more, more preferably 65.0% by volume or more, and even more preferably 70.0% by volume or more, with the upper limit being preferably 80.0% by volume or less. When the saturated matter content of the desulfurized straight-run diesel oil is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0082] (b 11 ) Aromatic content The aromatic content of the desulfurized straight-run diesel oil is preferably 10.0% by volume or more, more preferably 20.0% by volume or more, with the upper limit preferably being 30.0% by volume or less. When the aromatic content of the desulfurized straight-run diesel oil is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0083] (b 12 ) Distillation properties As the distillation properties of the desulfurized straight-run diesel oil, the 10% by volume distillation temperature is preferably 180.0°C or higher, more preferably 210.0°C or higher, with the upper limit being preferably 250.0°C or lower, more preferably 240.0°C or lower. The 50% by volume distillation temperature is preferably 250.0°C or higher, more preferably 265.0°C or higher, with the upper limit being preferably 320.0°C or lower, more preferably 300.0°C or lower. Furthermore, the 90% by volume distillation temperature is preferably 300.0°C or higher, more preferably 320.0°C or higher, with the upper limit being preferably 360.0°C or lower, more preferably 350.0°C or lower. When the desulfurized straight-run diesel oil has the above-mentioned 10% by volume distillation temperature, 50% by volume distillation temperature, and 90% by volume distillation temperature, the effects of the low-boiling point components and high-boiling point components of the diesel fuel oil composition of this embodiment are suppressed, and combustion performance is improved.

[0084] (Desulfurized straight-run diesel content) When the diesel fuel oil composition of this embodiment contains desulfurized straight-run light oil, the content of the desulfurized straight-run light oil based on the total amount of the composition is preferably 5.0% by volume or more, more preferably 10.0% by volume or more, even more preferably 15.0% by volume or more, and even more preferably 20.0% by volume or more, with the upper limit being preferably 60.0% by volume or less, more preferably 55.0% by volume or less. When the content of desulfurized straight-run light oil is within the above range, the ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy of the diesel fuel oil composition of this embodiment are improved in a balanced manner depending on the combination with other oil types.

[0085] [Dewaxed diesel] The diesel fuel oil composition of this embodiment contains at least one base material selected from the group consisting of desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene. Dewaxed diesel oil is a fraction obtained by dewaxing a diesel fraction (straight-run diesel fraction) obtained by atmospheric distillation of crude oil in an atmospheric distillation unit to selectively crack heavy paraffins. It is preferable that the dewaxed gas oil has properties that satisfy all of the following (c1) to (c4). (c1) Cetane number is 40.0 or more and 70.0 or less (c2) Pour point is -25.0℃ or more and -5.0℃ or less (c3) Clogging point is between -25.0°C and -5.0°C (c4) Total heat output is 38,000 J / cm 3 End

[0086] (c1) Cetane number The cetane number of the dewaxed diesel fuel is preferably 40.0 or higher, more preferably 45.0 or higher, and even more preferably 50.0 or higher, with no particular upper limit, and is usually not higher than 70.0. When the cetane number of the dewaxed diesel fuel is within the above range, the cetane number of the diesel fuel oil composition of this embodiment is likely to exceed 58.0, and excellent ignition performance is obtained.

[0087] (c2) Pour point The pour point of the dewaxed diesel oil is preferably −5.0° C. or lower, more preferably −10.0° C. or lower, and even more preferably −15.0° C. or lower, with no particular lower limit, and is usually −25.0° C. or higher. When the pour point of the dewaxed diesel oil is within the above range, the pour point of the diesel fuel oil composition of this embodiment is likely to be −17.5° C. or lower, and excellent low-temperature flow performance can be obtained.

[0088] (c3) Clogging point The filter plugging point of the dewaxed gas oil is preferably −5.0° C. or lower, more preferably −10.0° C. or lower, and even more preferably −15.0° C. or lower, with no particular lower limit, and is usually −25.0° C. or higher. When the filter plugging point of the dewaxed gas oil is within the above range, the filter plugging point of the diesel fuel oil composition of this embodiment is likely to be −10° C. or lower, and excellent low-temperature flow properties can be obtained.

[0089] (c4) Total heat generation The total calorific value of the dewaxed gas oil is preferably 38000 J / cm 3 or more, more preferably 38150 J / cm 3 More preferably, 38,300 J / cm 3 There is no upper limit, and it is usually 39,000 J / cm 3 When the total calorific value of the dewaxed light oil is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less.3 This makes it easy to achieve super high fuel efficiency.

[0090] The dewaxed light oil contained in the diesel fuel oil composition of this embodiment has the following properties (c5) to (c6) in addition to the properties (c1) to (c4) described above: 12 ) and preferably satisfies at least one of the following (c5) to (c 12 ) is preferably satisfied.

[0091] (c5) Density at 15°C The density of the dewaxed gas oil at 15°C is preferably 0.8200 g / cm 3 More preferably, 0.8250 g / cm 3 More preferably, 0.8350 g / cm 3 The upper limit is preferably 0.8600 g / cm 3 or less, more preferably 0.8500 g / cm 3 or less, and more preferably 0.8450 g / cm 3 If the density of the dewaxed light oil at 15°C is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easy to achieve super high fuel efficiency.

[0092] (c6) Kinematic viscosity at 30°C The kinematic viscosity of the dewaxed diesel fuel at 30°C is preferably 3.500 mm 2 / s or more, preferably 4,000 mm 2 / s or more, more preferably 4,500 mm 2 / s or more, and the upper limit is preferably 6,000 mm 2 / s or less, preferably 5.500 mm 2 / s or less, more preferably 5,000 mm 2 If the kinematic viscosity at 30°C of the dewaxed light oil is within the above range, the diesel fuel oil composition of this embodiment will be more easily suited to the range of use of various devices such as pumps and flow meters, and will also have improved lubricity.

[0093] (c7) Sulfur content The lower the sulfur content of the dewaxed diesel oil, the better, and more specifically, it is preferably 0.0015% by mass or less, more preferably 0.0010% by mass or less, and even more preferably 0.0008% by mass or less. If the sulfur content of the dewaxed diesel oil is within the above range, the environmental load of the diesel fuel oil composition of this embodiment can be reduced, improving environmental performance, and sulfur oxides in exhaust gas can be reduced, making it possible to inhibit corrosion.

[0094] (c8) Flash point The flash point of the dewaxed diesel fuel is preferably 65.0° C. or higher, more preferably 70.0° C. or higher, and even more preferably 75.0° C. or higher, with no particular upper limit, and is usually 90.0° C. or lower. If the flash point of the dewaxed diesel fuel is within the above range, the safety of handling the diesel fuel composition of this embodiment can be improved.

[0095] (c9) Cloud point The cloud point of the dewaxed diesel oil is preferably −3° C. or lower, more preferably −5° C. or lower, and even more preferably −10° C. or lower, and there is no particular lower limit, but it is usually −25° C. or higher. When the cloud point of the dewaxed diesel oil is within the above range, the low-temperature flow performance of the diesel fuel oil composition of this embodiment is improved, and it becomes possible to suppress filter clogging due to precipitated wax without the need for equipment measures such as heat retention.

[0096] (c 10 )Saturate content The saturated matter content of the dewaxed diesel oil is preferably 60.0% by volume or more, more preferably 65.0% by volume or more, and even more preferably 70.0% by volume or more, with the upper limit being preferably 80.0% by volume or less. When the saturated matter content of the dewaxed diesel oil is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0097] (c 11 ) Aromatic content The aromatic content of the dewaxed diesel oil is preferably 10.0% by volume or more, more preferably 20.0% by volume or more, with the upper limit preferably being 30.0% by volume or less. When the aromatic content of the dewaxed diesel oil is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0098] (c 12 ) Distillation properties As distillation properties of the dewaxed diesel oil, the 10% by volume distillation temperature is preferably 190.0°C or higher, more preferably 220.0°C or higher, with the upper limit being preferably 260.0°C or lower, more preferably 250.0°C or lower. The 50% by volume distillation temperature is preferably 270.0°C or higher, more preferably 295.0°C or higher, with the upper limit being preferably 330.0°C or lower, more preferably 310.0°C or lower. Furthermore, the 90% by volume distillation temperature is preferably 310.0°C or higher, more preferably 330.0°C or higher, with the upper limit being preferably 370.0°C or lower, more preferably 360.0°C or lower. When the dewaxed diesel oil has the above-mentioned 10% by volume distillation temperature, 50% by volume distillation temperature, and 90% by volume distillation temperature, the effects of the low-boiling point components and high-boiling point components of the diesel fuel oil composition of this embodiment are suppressed, and combustion performance is improved.

[0099] (Dewaxed diesel content) When the diesel fuel oil composition of this embodiment contains dewaxed light oil, the content of the dewaxed light oil based on the total amount of the composition is preferably 5.0% by volume or more, more preferably 20.0% by volume or more, even more preferably 40.0% by volume or more, with the upper limit being preferably 97.5% by volume or less, more preferably 95.0% by volume or less, even more preferably 85.0% by volume or less, and still more preferably 70.0% by volume or less. When the content of dewaxed light oil is within the above range, the ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy of the diesel fuel oil composition of this embodiment are improved in a balanced manner, depending on the combination with other oil types.

[0100] [Desulfurized kerosene] The diesel fuel oil composition of this embodiment contains at least one base material selected from the group consisting of desulfurized straight-run light oil, dewaxed light oil, and desulfurized kerosene. Desulfurized kerosene is a fraction obtained by desulfurizing a straight-run kerosene fraction having a boiling point of about 140°C to 290°C obtained by fractional distillation of crude oil in an atmospheric distillation unit. It is preferable that the desulfurized kerosene has properties that satisfy all of the following (d1) to (d4). (d1) Cetane number is 30.0 or more and 60.0 or less (d2) Pour point is -70.0°C or higher and -20.0°C or lower (d3) Clogging point is -70.0°C or higher and -20.0°C or lower (d4) Total heat output is 36,300 J / cm 3 End

[0101] (d1) Cetane number The cetane number of the desulfurized kerosene is preferably 30.0 or more, more preferably 35.0 or more, and even more preferably 40.0 or more, and there is no particular upper limit, but it is usually 60.0 or less. When the cetane number of the desulfurized kerosene is within the above range, the cetane number of the diesel fuel oil composition of this embodiment is likely to exceed 58.0, and excellent ignition performance can be obtained.

[0102] (d2) Pour point The pour point of the desulfurized kerosene is preferably −20.0° C. or lower, more preferably −30.0° C. or lower, and even more preferably −45.0° C. or lower, and there is no particular lower limit, but it is usually −70.0° C. or higher. When the pour point of the desulfurized kerosene is within the above range, the pour point of the diesel fuel oil composition of this embodiment is likely to be −17.5° C. or lower, and excellent low-temperature flow performance can be obtained.

[0103] (d3) Clogging point The filter plugging point of the desulfurized kerosene is preferably −20.0° C. or lower, more preferably −30.0° C. or lower, and even more preferably −45.0° C. or lower, and there is no particular lower limit, but it is usually −70.0° C. or higher. When the filter plugging point of the desulfurized kerosene is within the above range, the filter plugging point of the diesel fuel oil composition of this embodiment is likely to be −10° C. or lower, and excellent low-temperature flow performance can be obtained.

[0104] (d4) Total heat generation The total calorific value of desulfurized kerosene is preferably 36300 J / cm 3 More than 36450 J / cm 3 More preferably, 36550 J / cm 3 There is no upper limit, and it is usually 40,000 J / cm 3 When the total calorific value of the desulfurized kerosene is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easy to achieve super high fuel efficiency.

[0105] Furthermore, the desulfurized kerosene contained in the diesel fuel oil composition of this embodiment has the following properties (d5) to (d6) in addition to the properties (d1) to (d4) described above: 12 ) and preferably satisfies at least one of the following (d5) to (d 12 ) is preferably satisfied.

[0106] (d5) Density at 15°C The density of the desulfurized kerosene at 15°C is preferably 0.7700 g / cm 3 More preferably, 0.7800 g / cm 3 or more, more preferably 0.7850 g / cm 3 The upper limit is preferably 0.8100 g / cm 3 or less, more preferably 0.8000 g / cm 3 or less, and more preferably 0.7950 g / cm 3 If the density of the desulfurized kerosene at 15°C is within the above range, the total calorific value of the diesel fuel oil composition of this embodiment is 37,000 J / cm or less. 3 This makes it easy to achieve super high fuel efficiency.

[0107] (d6) Kinematic viscosity at 30°C The kinematic viscosity of the desulfurized kerosene at 30°C is preferably 1.000 mm 2 / s or more, preferably 1.100 mm 2 / s or more, more preferably 1.2500 mm2 / s or more, and the upper limit is preferably 1.7500 mm 2 / s or less, preferably 1.500 mm 2 / s or less, more preferably 51.350 mm 2 If the kinematic viscosity at 30°C of the desulfurized kerosene is within the above range, the diesel fuel oil composition of this embodiment will be more easily suited to the range of use of various devices such as pumps and flow meters, and will also have improved lubricity.

[0108] (d7) Sulfur content The lower the sulfur content of the desulfurized kerosene, the better, and more specifically, it is preferably 0.0015% by mass or less, more preferably 0.0010% by mass or less, and even more preferably 0.0008% by mass or less. When the sulfur content of the desulfurized kerosene is within the above range, the environmental load of the diesel fuel oil composition of this embodiment can be reduced, thereby improving environmental performance, and sulfur oxides in exhaust gas can be reduced, making it possible to suppress corrosion.

[0109] (d8) Flash point The flash point of the desulfurized kerosene is preferably 25.0° C. or higher, more preferably 30.0° C. or higher, and even more preferably 35.0° C. or higher, and there is no particular upper limit, but it is usually 60.0° C. or lower. When the flash point of the desulfurized kerosene is within the above range, the safety of handling the diesel fuel oil composition of this embodiment can be improved.

[0110] (d9) Cloud point The cloud point of the desulfurized kerosene is preferably −30° C. or lower, more preferably −35° C. or lower, and even more preferably −40° C. or lower, and there is no particular lower limit, but it is usually −65° C. or higher. When the cloud point of the desulfurized kerosene is within the above range, the low-temperature flow performance of the diesel fuel oil composition of this embodiment is improved, and it becomes possible to suppress filter clogging due to precipitated wax without the need for equipment measures such as heat retention.

[0111] (d 10 )Saturate content The saturated content of the desulfurized kerosene is preferably 65.0% by volume or more, more preferably 70.0% by volume or more, and even more preferably 75.0% by volume or more, with the upper limit being preferably 90.0% by volume or less. When the saturated content of the desulfurized kerosene is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0112] (d 11 ) Aromatic content The aromatic content of the desulfurized kerosene is preferably 5.0% by volume or less, more preferably 10.0% by volume or more, and even more preferably 15.0% by volume or more, with the upper limit being preferably 25.0% by volume or less. When the aromatic content of the desulfurized kerosene is within the above range, the diesel fuel oil composition of this embodiment will have a good balance of ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance, depending on the combination with other oil types.

[0113] (d 12 ) Distillation properties As distillation properties of the desulfurized kerosene, the 10% by volume distillation temperature is preferably 120.0°C or higher, more preferably 150.0°C or higher, with the upper limit being preferably 190.0°C or lower, more preferably 180.0°C or lower. The 50% by volume distillation temperature is preferably 160.0°C or higher, more preferably 175.0°C or higher, with the upper limit being preferably 220.0°C or lower, more preferably 200.0°C or lower. Furthermore, the 90% by volume distillation temperature is preferably 190.0°C or higher, more preferably 210.0°C or higher, with the upper limit being preferably 250.0°C or lower, more preferably 240.0°C or lower. When the desulfurized kerosene has the above-mentioned 10% by volume distillation temperature, 50% by volume distillation temperature, and 90% by volume distillation temperature, the effects of the low-boiling point components and high-boiling point components of the diesel fuel oil composition of this embodiment are suppressed, and combustion performance is improved.

[0114] (Desulfurized kerosene content) When the diesel fuel oil composition of this embodiment contains desulfurized kerosene, the content of the desulfurized kerosene based on the total amount of the composition is preferably 2.5% by volume or more, more preferably 5.0% by volume or more, and even more preferably 10.0% by volume or more, with the upper limit being preferably 40.0% by volume or less, more preferably 30.0% by volume or less, and even more preferably 20.0% by volume or less. When the content of desulfurized kerosene is within the above range, the ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy of the diesel fuel oil composition of this embodiment are improved in a balanced manner, depending on the combination with other oil types.

[0115] Among the combinations of the hydrotreated vegetable oil (HVO) contained in the diesel fuel oil composition of this embodiment and base stock, the combinations of hydrotreated vegetable oil (HVO) and desulfurized straight-run diesel oil, hydrotreated vegetable oil (HVO) and dewaxed diesel oil, hydrotreated vegetable oil (HVO), dewaxed diesel oil and desulfurized kerosene, and hydrotreated vegetable oil (HVO), desulfurized straight-run diesel oil and dewaxed diesel oil are preferred, with the combination of hydrotreated vegetable oil (HVO) and dewaxed diesel oil being more preferred. These combinations can further improve ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy.

[0116] (Other additives) The diesel fuel oil composition of this embodiment can be blended with various additives, such as antioxidants, flow improvers, lubricity improvers, cetane number improvers, combustion promoters, detergents, sludge dispersants, and antifungal agents, as needed, within a range that maintains the above-mentioned properties. Among these, the use of a flow improver is preferred. The diesel fuel oil composition of this embodiment is a fuel oil composition with excellent low-temperature flow performance, as shown in the examples, and the use of a flow improver can easily improve low-temperature flow performance. Furthermore, coumarin may be blended from the perspective of diesel oil delivery tax.

[0117] A flow improver refers to an additive incorporated for the purpose of lowering the pour point, etc., and examples of such an additive include surfactant-based flow improvers, ethylene-vinyl acetate copolymers, ethylene-alkyl acrylate copolymers, chlorinated polyethylene, polyalkyl acrylates, alkenyl succinamide compounds, etc. The amount of flow improver added is not particularly limited, but in consideration of the balance between effect and economic efficiency, it is preferably added in the range of 10 to 1,000 ppm by mass, more preferably 100 to 700 ppm by mass, and even more preferably 150 to 500 ppm by mass.

[0118] [Method for producing diesel fuel oil composition] The method for producing a diesel fuel oil composition according to this embodiment is a method for producing a diesel fuel oil composition that satisfies all of the following (1) to (4), by mixing a hydrotreated vegetable oil with at least one base material selected from desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene so that the content of the hydrotreated vegetable oil is 0.1% by volume or more and less than 70.0% by volume based on the total volume of the composition. The diesel fuel oil composition of this embodiment can be easily produced by the production method of this embodiment. That is, the production method of this embodiment makes it possible to easily produce a diesel fuel oil composition of this embodiment that satisfies all of the following (1) to (4). (1) Cetane number exceeds 58.0 (2) Pour point is -17.5°C or less (3) Clogging point is -10°C or less (4) Total calorific value is 37,000 J / cm 3 super

[0119] In the method for producing a diesel fuel oil composition of this embodiment, the hydrotreated vegetable oil and at least one base material selected from desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene are the same as those described above as being included in the diesel fuel oil composition of this embodiment. The properties of these oil types and the properties of the diesel fuel oil composition obtained by the production method of this embodiment are also the same as those described above for the diesel fuel oil composition of this embodiment. Furthermore, the contents of these oil types are also the same as those described above for the diesel fuel oil composition of this embodiment. Furthermore, various additives can be mixed as needed, as described above in connection with the diesel fuel oil composition of this embodiment.

[0120] There are no particular restrictions on the order in which the hydrotreated vegetable oil and at least one base material selected from desulfurized straight-run diesel, dewaxed diesel, and desulfurized kerosene are mixed. For example, the base material selected from desulfurized straight-run diesel, dewaxed diesel, and desulfurized kerosene, and various additives may be added sequentially to the hydrotreated vegetable oil and mixed; the hydrotreated vegetable oil, at least one base material selected from desulfurized straight-run diesel, dewaxed diesel, and desulfurized kerosene, and various additives as needed may be mixed simultaneously (lump-mixing); or multiple oil types selected from desulfurized straight-run diesel, dewaxed diesel, and desulfurized kerosene may be mixed in advance, and then the hydrotreated vegetable oil and various additives may be added and mixed. [Example]

[0121] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0122] [Performance evaluation criteria] The following performance ratings 1 to 4 were evaluated, and the worst rating was used as the overall rating. A rating of C indicates failure. The ratings for each performance are shown in Table 2.

[0123] 1.Ignition performance Based on the cetane number of the fuel oil compositions of the Examples and Comparative Examples, the ignition performance was evaluated according to the following criteria. A: Cetane number 59.5 or higher B: Cetane number greater than 58.0 and less than 59.5 C: Cetane number 58.0 or less

[0124] 2. Combustion performance at low temperatures Based on the THC concentration of the fuel oil compositions of the Examples and Comparative Examples, combustion performance at low temperatures was evaluated according to the following criteria. A: THC concentration is 600 ppm by mass or less B: THC concentration is more than 600 mass ppm and less than 1100 mass ppm C: THC concentration is over 1100 ppm by mass

[0125] 3-1.Low temperature flow performance Based on the pour points of the fuel oil compositions of the Examples and Comparative Examples, the low-temperature flow performance was evaluated according to the following criteria. A: Pour point is -19.5℃ or less B: Pour point is greater than -19.5°C and less than -17.5°C C: Pour point is above -17.5°C

[0126] 3-2.Low temperature flow performance Based on the plugging points of the fuel oil compositions of the Examples and Comparative Examples, the low-temperature flow performance was evaluated according to the following criteria. A: Clogging point is -16.5°C or less B: Clogging point is above -16.5°C and below -10.0°C C: Clogging point is above -10.0°C

[0127] 4. Fuel efficiency Based on the total calorific value of the fuel oil compositions of the Examples and Comparative Examples, fuel economy performance was evaluated according to the following criteria. A: Total calorific value is 37380J / cm 3 End B: Total calorific value is 37000J / cm 3 More than 37380J / cm 3 less than C: Total calorific value is 37000J / cm 3 less than

[0128] [Examples 1 to 7, Comparative Examples 1 to 4] Various base materials having the properties shown in Table 1 were mixed in the proportions shown in Table 2 to prepare fuel oil compositions of Examples 1 to 7 and Comparative Examples 1 to 4. In Example 4, 200 ppm by mass of a low-temperature flow improver ("Infineum R240", manufactured by Infinium Japan) was further added. The properties of the various base materials shown in Table 1 were measured according to the methods described above. The resulting fuel oil compositions were evaluated for ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance using the methods described above. The results are shown in Table 2.

[0129] [Table 1]

[0130] [Table 2]

[0131] It was confirmed that the diesel fuel oil compositions of Examples 1 to 7 were compositions that combined excellent ignition performance, low-temperature combustion performance, low-temperature fluidity, and fuel economy. Furthermore, it was confirmed that the composition of Example 4, in which a flow improver was added to the diesel fuel oil composition of Example 3, had improved pour point and plugging point, and improved low-temperature fluidity.

[0132] On the other hand, the compositions of Comparative Examples 1 to 3 were found to have poor combustion performance at low temperatures because they did not contain hydrotreated vegetable oil (HVO), and to have poor ignition performance because their cetane numbers were low. Furthermore, the composition of Comparative Example 1 had poor low-temperature flow performance even when a flow improver was added, and it was found that without the addition of hydrotreated vegetable oil (HVO), good low-temperature flow performance could not be obtained even with the addition of a flow improver. Furthermore, Comparative Example 4 was a composition that contained hydrotreated vegetable oil (HVO) and dewaxed kerosene, but the content of hydrotreated vegetable oil (HVO) was 70.0% by volume, outside the range of less than 70.0% by volume, and the low gross calorific value confirmed poor fuel economy.

[0133] Furthermore, the results of Examples 1 to 7 and Comparative Examples 1 to 4 show that the average THC concentration (THC concentration) at -10°C decreases and low-temperature combustion performance improves as the content of hydrotreated vegetable oil (HVO) increases. On the other hand, the results of Comparative Example 4 show that if the content of hydrotreated vegetable oil (HVO) is too high, fuel economy performance decreases, and therefore the content of hydrotreated vegetable oil (HVO) is important in achieving both low-temperature combustion performance and fuel economy. From the above, it has been confirmed that the diesel fuel oil composition of this embodiment contains a specified oil type, has a specified content of hydrotreated vegetable oil (HVO), and has the properties (1) to (4), thereby becoming a composition that combines excellent ignition performance, low-temperature combustion performance, low-temperature flow performance, and fuel economy performance.

Claims

1. A diesel fuel oil composition comprising a hydrotreated vegetable oil and at least one base material selected from the group consisting of desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene, wherein the content of the hydrotreated vegetable oil based on the total amount of the composition is 0.1% by volume or more but less than 70.0% by volume, and the composition satisfies all of the following (1) to (4): (1) Cetane number exceeding 58.0 (2) Pour point is -17.5°C or less (3) Clogging point is -10°C or less (4) Total heat output is 37,000 J / cm ３ super

2. The hydrotreated vegetable oil is １ ) to (a ４ 2. The diesel fuel oil composition according to claim 1, wherein all of the above conditions are satisfied. (a １ ) Cetane number is 60.0 or more and 85.0 or less (a ２ ) Pour point is -60.0°C or higher and 0.0°C or lower (a ３ ) Clogging point is between -50.0°C and 0.0°C (a ４ ) Total heat output is 36,000 J / cm ３ End

3. The desulfurized straight-run gas oil is １ ) to (b ４ 3. The diesel fuel oil composition according to claim 1, wherein all of the above conditions are satisfied. (b １ ) Cetane number is 40.0 or more and 70.0 or less (b ２ ) Pour point is -20.0°C or higher and 5.0°C or lower (b ３ ) Clogging point is between -15.0°C and 5.0°C (b ４ ) Total heat output is 37,500 J / cm ３ End

4. The dewaxed light oil is １ ) to (c ４ 4. The diesel fuel oil composition according to claim 1, wherein all of the above conditions are satisfied. (c １ ) Cetane number is 40.0 or more and 70.0 or less (c ２ ) Pour point is -25.0°C or higher and -5.0°C or lower (c ３ ) Clogging point is between -25.0°C and -5.0°C (c ４ ) Total heat output is 38,000 J / cm ３ End

5. The desulfurized kerosene is １ ) to (d ４ 5. The diesel fuel oil composition according to claim 1, wherein all of the above conditions are satisfied. (d １ ) Cetane number is 30.0 or more and 60.0 or less (d ２ ) Pour point is -70.0°C or higher and -20.0°C or lower (d ３ ) Clogging point is between -70.0°C and -20.0°C (d ４ ) Total heat output is 36,300 J / cm ３ End

6. The diesel fuel oil composition according to any one of claims 1 to 5, further comprising a flow improver.

7. A method for producing a diesel fuel oil composition, which comprises mixing a hydrotreated vegetable oil with at least one base material selected from desulfurized straight-run diesel oil, dewaxed diesel oil, and desulfurized kerosene so that the content of the hydrotreated vegetable oil in the total composition is 0.1% by volume or more but less than 70.0% by volume, and which satisfies all of the following (1) to (4): (1) Cetane number exceeding 58.0 (2) Pour point is -17.5°C or less (3) Clogging point is -10°C or less (4) Total heat output is 37,000 J / cm ３ super

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