JP2004075901A - Gas oil composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas oil composition which has a sulfur content of ≤50 mass ppm, does not plug filters at low temperature, and satisfies a practical performance and an exhaust gas-cleaning performance. <P>SOLUTION: This gas oil composition is characterized by having a sulfur content of ≤50 mass ppm, a slow cooling clouding point of -8°C, a 27C normal paraffin content of <0.003 mass % in the composition, a temperature difference of ≤55°C between a 90% distillation temperature and a 50% distillation temperature, a temperature difference of ≤120°C between a 90% distillation temperature and a 10% distillation temperature, a pour point of ≤-7.5°C, a cloud filter plugging point of ≤-5°C, a cetane index of ≥45.0, a dynamic viscosity of 2.5 to 6.0 mm<SP>2</SP>/s at 30°C, a 90% distillation temperature of ≤350°C, an HFRR WS 1.4 value of ≤460μm, a flash point of ≥50°C, and a residual carbon content of ≤0.1 mass % in 10% residual oil. <P>COPYRIGHT: (C)2004,JPO

Description

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[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a low sulfur gas oil composition having a sulfur content of 50 mass ppm or less, which achieves both effective reduction of exhaust gas and good low temperature performance in a diesel vehicle.
[0002]
[Prior art]
In recent years, from an environmental point of view, large emission of environmental pollutants such as PM (particulate matter), NOx (nitrogen oxide), HC (hydrocarbon) and CO (carbon monoxide) in exhaust gas from diesel vehicles Reduction is required. To this end, improvements in the engine and refinement of fuel injection control have been pursued, and exhaust gas emissions from diesel vehicles have been reduced by adopting post-treatment devices such as oxidation catalysts, NOx reduction catalysts, and DPFs (diesel particulate filters). ing. On the other hand, light oil is required to further reduce the sulfur content in order to effectively exert the performance of these post-treatment devices and maintain durability.
[0003]
When reducing the sulfur content of gas oil, it is effective to make the straight-run gas oil base material lighter in order to secure the life of the desulfurization catalyst. However, by making the base material lighter, the wax deposition rate at the time of cooling is increased. That is, when the temperature is lowered, the wax is precipitated at a stretch.
Further, in order to reduce the sulfur content of the straight-run gas oil, a high-level hydrorefining treatment is generally required, but as the hydrogenation of the base material proceeds, the low-temperature fluidity tends to deteriorate.
Furthermore, in order to produce a low-sulfur gas oil, the blending of a cracking base material having a relatively high sulfur content (such as a gas oil fraction (MHC-GO) obtained from a mild hydrocracking apparatus) is limited. In general, a decomposed base material is excellent in low-temperature fluidity. Therefore, if the amount of the decomposed base material in light oil is limited for low sulfur, the low-temperature fluidity may be deteriorated.
[0004]
2. Description of the Related Art In diesel vehicles, high-precision fuel injection system control is being promoted in order to make the function of a post-processing device more effective. As the injection system becomes more precise, it becomes necessary to remove finer dust in the fuel, so that a finer filter is provided. Such a fine-grained filter is liable to be clogged by wax precipitated from light oil at a low temperature.
Further, in diesel vehicles that perform such precise injection control, the fuel injection pressure is increased to prevent exhaust gas. As the fuel injection pressure increases, the amount of fuel passing through the filter increases, so that filter clogging due to wax precipitated from light oil at low temperatures tends to occur.
[0005]
Therefore, in a combination of a low-sulfur gas oil and a diesel vehicle equipped with a post-processing device and performing more precise injection control, the problem of filter blockage due to deposition of wax in the gas oil at low temperatures is an important issue.
According to JIS K2204 "Diesel oil", diesel oil is classified into five grades of No. 1, No. 2, No. 3, and No. 3 based on low-temperature fluidity and the like. We have seasonal usage guidelines. According to these guidelines, it is desirable to use No. 2 gas oil when the minimum temperature in each region and each month is -10 ° C. However, in the combination of low-sulfur gas oil and a diesel vehicle that carries out more precise injection control by installing a post-treatment device, even if the minimum temperature of -10 ° C. is satisfied even if the specification of JIS No. 2 gas oil is satisfied. In this case, there is a concern that the filter may be blocked.
[0006]
On the other hand, because diesel vehicles are mobile, and generally have a certain period of time between when diesel is manufactured and refueled and used up, diesel has low-temperature fluidity at the lowest temperature at which it is used. At the same time, it is required that it can be used without problems in practical performance even in an environment at a higher temperature than it can be used.
[0007]
In low sulfur gas oils with a sulfur content of 50 mass ppm or less, especially in areas and months where it is desirable to use No. 2 gas oils of the JIS guidelines, low-temperature filter clogging does not occur and practical performance and exhaust gas purification performance are improved. As a satisfying gas oil composition, there is a gas oil composition containing normal paraffin having 27 carbon atoms in an amount of 0.003% by mass or more and various properties specified in a specific range (Japanese Patent Application No. 2002-233985).
[0008]
[Problems to be solved by the invention]
In the present invention, in the case of low sulfur gas oil having a sulfur content of 50 mass ppm or less, particularly when the content of normal paraffin having 27 carbon atoms is less than 0.003 mass%, the use of No. 2 gas oil of the JIS guidelines is particularly preferable. An object of the present invention is to provide a light oil composition which does not cause low-temperature filter blockage in a desired area or month, and satisfies practical performance and exhaust gas purification performance.
[0009]
[Means for Solving the Problems]
As a result of intensive studies, the present inventors have found that a gas oil composition that satisfies all of the specific properties specified below can solve the above-described problems, and has completed the present invention.
That is, according to the present invention, the sulfur content is 50 mass ppm or less, the slow cooling cloud point is -8.0 ° C. or less, the content of normal paraffin having 27 carbon atoms in the composition is less than 0.003 mass%, and 90% The difference between the exit temperature and the 50% distillation temperature is 55 ° C or less, the difference between the 90% distillation temperature and the 10% distillation temperature is 120 ° C or less, the pour point is -7.5 ° C or less, and the clogging point is -5 ° C. Hereinafter, the cetane index is 45.0 or more, and the kinematic viscosity at 30 ° C. is 2.5 to 6.0 mm. ² / S, 90% distillation temperature is 350 ° C or less, WS1.4 value of HFRR is 460µm or less, flash point is 50 ° C or more, and residual carbon content of 10% residual oil is 0.1% by mass or less. And a light oil composition.
[0010]
In the gas oil composition of the present invention, the difference between the 95% distillation temperature and the 90% distillation temperature is preferably 15 ° C or less, and the difference between the distillation end point and the 95% distillation temperature is preferably 15 ° C or less.
[0011]
Further, the light oil composition of the present invention preferably contains 25 to 500 mg / L of a lubricity improver.
[0012]
Further, the present invention relates to (A) a base material having a sulfur content of 50 mass ppm or less, a 90% distillation temperature of 300 ° C. or more and 350 ° C. or less, and a content of normal paraffin having 27 carbon atoms of less than 0.006 mass%. 50 to 100% by volume based on the total amount of the composition, (B) a sulfur content of 50 mass ppm or less, a 90% distillation temperature of 200 ° C or more and less than 300 ° C, and a total amount of normal paraffins having 20 or more carbon atoms of 0.02% by mass. The present invention relates to the above-mentioned method for producing a gas oil composition, wherein the following base material is blended in an amount of 0 to 50% by volume based on the total amount of the composition.
[0013]
Further, the present invention provides a method for hydrodesulfurizing a raw material oil containing at least 50% by volume of a straight-run gas oil having a 90% distillation temperature of 305 ° C or more and 340 ° C or less as the base material (A1). The obtained hydrodesulfurized gas oil base material having a 90% distilling temperature of 330 ° C. or less is obtained in an amount of 50 to 100% by volume based on the total amount of the composition, and (A2) a sulfur content of 15 mass ppm or less obtained from a hydrocracking apparatus. The present invention relates to a method for producing a gas oil composition, characterized in that 0 to 50% by volume of the hydrocracked gas oil is blended based on the total amount of the composition.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the contents of the present invention will be described in more detail.
The gas oil composition of the present invention needs to have a sulfur content of 50 mass ppm or less. If the sulfur content in the gas oil composition is more than 50 ppm by mass, the exhaust gas purification performance of a post-treatment device for a diesel vehicle is undesirably deteriorated. In addition, the sulfur content is preferably 30 mass ppm or less, more preferably 15 mass ppm or less, still more preferably 10 mass ppm or less, and still more preferably 5 mass ppm or less from the viewpoint of exhaust gas purification performance of a post-treatment device for a diesel vehicle. It is preferably at most 1 ppm by mass. In addition, the sulfur content here means the content of the sulfur content measured by JIS K2541 “Sulfur content test method”.
[0015]
The light oil composition of the present invention needs to have a slow cooling cloud point of −8.0 ° C. or less. If the slow cooling cloud point is higher than -8.0 ° C, it is not preferable in that the filter may block the diesel vehicle. From the same viewpoint, the slow cooling cloud point is preferably -9.0 ° C or less, The temperature is more preferably -10.0 ° C or lower, further preferably -11.0 ° C or lower, and most preferably -12.0 ° C or lower. Further, the slow cooling cloud point of the present light oil composition is preferably -20.0 ° C or more from the viewpoint of securing the stability of engine rotation during idling, fuel consumption rate, engine output, and startability at high temperatures, The temperature is more preferably -18.0 ° C or higher, further preferably -16.0 ° C or higher, and most preferably -15.0 ° C or higher. Here, the slow cooling cloud point is defined as a cloud point obtained by detecting at a temperature of 10 ° C. or more higher than the cloud point and gradually cooling at 0.5 ° C./min until a cloud point is detected, and detecting the cloud point in 0.1 ° C. units. It is a point. The method of detecting the slowly cooling cloud point is to irradiate the sample with light and reduce the reflected light on the aluminum surface at the bottom of the sample container by a predetermined amount (the reflected light of the light irradiated from a height of 3 mm from the bottom of the sample liquid having a thickness of 15 mm). Is reduced to 7/8 or less).
[0016]
The content of the normal paraffin having 27 carbon atoms in the gas oil composition of the present invention needs to be less than 0.003% by mass from the viewpoint of preventing filter clogging of a diesel vehicle and facilitating desulfurization in a manufacturing process. . Further, from the viewpoint of preventing filter clogging of a diesel vehicle and facilitating desulfurization in the production process, the content of normal paraffin having 27 carbon atoms in the present gas oil composition is preferably 0.002% by mass or less, and 0.1% by mass or less. More preferably, the content is 001% by mass or less.
The content of normal paraffin having 27 carbon atoms is a content determined by a gas chromatograph equipped with a nonpolar column and a FID (flame flame ionization detector) and operated by a predetermined temperature program. Is an analytical technique for separating and quantitatively analyzing each composition by using physical properties (boiling point, polarity, etc.) of each composition in a sample. The content of normal paraffin having 27 carbon atoms was determined by separating the peak of normal paraffin having 27 carbon atoms in the sample by gas chromatography and measuring the area of the obtained normal paraffin having 27 carbon atoms including components other than normal paraffin. By dividing by the total area of all components, it can be obtained in mass%.
[0017]
In the gas oil composition of the present invention, it is necessary that the difference between the 90% distillation temperature and the 50% distillation temperature of the distillation properties is 55 ° C. or less. If the difference between the 90% distilling temperature and the 50% distilling temperature is higher than 55 ° C., it may not be possible to achieve both low-temperature prevention of diesel vehicle filter blockage and practical performance and exhaust gas purification performance. The difference between the 90% distillation temperature and the 50% distillation temperature is preferably 50 ° C. or less, more preferably 50 ° C. or less, from the viewpoint of preventing the filter blockage of the diesel vehicle at a low temperature and achieving both the practical performance and the exhaust gas purification performance. The temperature is 45 ° C. or lower, more preferably 40 ° C. or lower, even more preferably 35 ° C. or lower, and most preferably 30 ° C. or lower. Here, the distillation property means a value measured in accordance with JIS K2254 "Petroleum products-distillation test method".
[0018]
In the gas oil composition of the present invention, it is necessary that the difference between the 90% distillation temperature and the 10% distillation temperature of the distillation properties is 120 ° C. or less. If the difference between the 90% distilling temperature and the 10% distilling temperature is higher than 120 ° C., it may not be possible to achieve both low-temperature prevention of filter blocking of diesel vehicles at low temperatures and practical performance and exhaust gas purification performance. The difference between the 90% distillation temperature and the 10% distillation temperature is preferably 115 ° C. or less, more preferably 115 ° C. or less, from the viewpoint of preventing the filter clogging of the diesel vehicle at a low temperature and achieving both practical performance and exhaust gas purification performance. The temperature is 110 ° C. or lower, more preferably 105 ° C. or lower, and most preferably 100 ° C. or lower.
[0019]
The pour point of the gas oil composition of the present invention needs to be −7.5 ° C. or lower, preferably −10 ° C. or lower, and preferably −12.5 ° C., from the viewpoint of ensuring fluidity in the fuel line. C. or lower, more preferably -15.degree. C. or lower. The pour point here means a value measured according to JIS K2269 "Pour point of crude oil and petroleum products and cloud point of petroleum products".
[0020]
The clogging point of the gas oil composition of the present invention needs to be −5 ° C. or less from the viewpoint of preventing filter clogging of diesel vehicles. In addition, from the viewpoint of preventing filter clogging of diesel vehicles, the clogging point of the present diesel fuel composition is preferably -8C or lower, more preferably -10C or lower, and -11C or lower. Is more preferable, and most preferably -12 ° C or lower. The term "clogging point" as used herein means a value measured according to JIS K2288 "Light oil-clogging point test method".
[0021]
The cetane index of the gas oil composition of the present invention is required to be 45.0 or more, preferably 50.0 or more, more preferably 51.0 or more, from the viewpoint of engine ignitability. , More preferably 52.0 or more, even more preferably 53.0 or more, even more preferably 54.0 or more, and most preferably 55.0 or more. The cetane index as used herein means a value measured according to JIS K2280 "Petroleum products-fuel oil-Octane number and cetane number test method and cetane index calculation method".
[0022]
The kinematic viscosity at 30 ° C. of the gas oil composition of the present invention is 2.5 to 6.0 mm. ² / S. Kinematic viscosity at 30 ° C is 2.5mm ² When it is used at a relatively high temperature, the engine may fail to start, the engine rotation during idling may become unstable, and the durability of the fuel injection pump may be reduced. Problems can arise. The kinematic viscosity at 30 ° C. is 2.7 mm from the viewpoints of starting performance at high temperatures, securing the stability of engine rotation during idling, and securing the durability of the fuel injection pump. ² / S or more, preferably 3.0 mm ² / S or more is more preferable. The kinematic viscosity at 30 ° C. is 6.0 mm ² / S is not preferable because black smoke increases. From the viewpoint of preventing black smoke from increasing, the kinematic viscosity at 30 ° C. is 5.5 mm. ² / S or less, preferably 5.0 mm ² / S or less, more preferably 4.5 mm ² / S or less. Here, the kinematic viscosity at 30 ° C. means a value measured according to JIS K2283 “Crude oil and petroleum products—Kinematic viscosity test method and viscosity index calculation method”.
[0023]
The 90% distillation property of the light oil composition of the present invention must be 350 ° C or lower. If the 90% distillation temperature is higher than 350 ° C., particulate matter (PM) discharged from the engine may increase. From the viewpoint of preventing an increase in PM discharged from the engine, the 90% distillation temperature is preferably 340 ° C or lower, more preferably 330 ° C or lower, further preferably 325 ° C or lower, and still more preferably 320 ° C. Or less, most preferably 315 ° C. or less. Further, the 90% distillation temperature of the present gas oil composition is preferably 280 ° C. or more, and more preferably 290 ° C. or more, from the viewpoints of startability at a high temperature, stability of engine rotation during idling, and fuel consumption rate. More preferably, it is more preferably 300 ° C. or higher, most preferably 305 ° C. or higher.
[0024]
The WS1.4 value of HFRR of the gas oil composition of the present invention needs to be 460 μm or less, preferably 420 μm or less, and more preferably 400 μm or less from the viewpoint of ensuring lubricity of the fuel injection pump. Most preferred. The HFRR WS1.4 value referred to herein means a value measured by the Japan Petroleum Institute standard JPI-5S-50-98 "Light oil-lubricity test method" issued by the Japan Petroleum Institute.
[0025]
The flash point of the gas oil composition of the present invention is required to be 50 ° C. or higher, and preferably 60 ° C. or higher, from the viewpoint of ensuring safety during handling. The flash point here means a value measured according to JIS K2265 "Crude oil and petroleum product flash point test method".
[0026]
Further, the residual carbon content of the 10% residual oil of the gas oil composition of the present invention needs to be 0.1% by mass or less from the viewpoint of reducing combustion deposits. Here, the residual carbon content of the 10% residual oil means a value measured according to JIS K2270 "Crude oil and petroleum products-Test method for residual carbon content".
[0027]
The difference between the 95% distillation temperature and the 90% distillation temperature of the distillation properties of the gas oil composition of the present invention is from the viewpoints of preventing filter clogging of diesel vehicles at low temperatures and achieving both practical performance and exhaust gas purification performance. It is preferably at most 15 ° C, more preferably at most 12 ° C, still more preferably at most 10 ° C, even more preferably at most 9 ° C, even more preferably at most 8 ° C. Preferably, it is 7 ° C. or less, most preferably.
[0028]
Further, the difference between the distillation end point and the 95% distillation temperature of the gas oil composition of the present invention is 15 ° C. or less from the viewpoint of preventing filter clogging of a diesel vehicle at a low temperature and achieving both practical performance and exhaust gas purification performance. It is preferably at most 14 ° C, more preferably at most 13 ° C, even more preferably at most 12 ° C, even more preferably at most 11 ° C. It is most preferred that:
[0029]
Further, the difference between the distillation end point and the 90% distillation temperature of the gas oil composition of the present invention is 30 ° C. or less from the viewpoint of preventing filter clogging of diesel vehicles at low temperatures and achieving both practical performance and exhaust gas purification performance. It is preferably at most 25 ° C, more preferably at most 22 ° C, even more preferably at most 20 ° C, even more preferably at most 18 ° C, and at most 17 ° C. It is most preferred that:
[0030]
Although the initial boiling point of the distillation properties of the gas oil composition of the present invention is not particularly limited, if the initial boiling point is too low, some light fractions are vaporized and the spray range is too wide, and The initial boiling point is preferably 140 ° C. or higher, from the viewpoint that there is a concern that HC entrained in the exhaust gas as fuel may increase, and that starting performance at high temperatures and stability of engine rotation during idling are ensured. It is preferably at least 150 ° C, more preferably at least 155 ° C, most preferably at least 160 ° C. On the other hand, if the initial boiling point is too high, there is a possibility of causing a problem in low-temperature startability and low-temperature operability, so the initial boiling point is preferably 240 ° C. or lower.
[0031]
If the 10% distillation temperature of the distillation properties of the gas oil composition of the present invention is too low, as in the case where the initial boiling point is too low, there is a concern that HC entrained in the exhaust gas may increase, and starting at high temperatures From the viewpoint of ensuring the stability of engine rotation during idling, the 10% distillation temperature is preferably 180 ° C or higher, more preferably 190 ° C or higher, further preferably 200 ° C or higher, and most preferably 210 ° C or higher. is there. On the other hand, if the 10% distillation temperature is too high, there is a possibility of causing a problem in low-temperature startability and low-temperature operability, so the 10% distillation temperature is preferably 265 ° C. or lower.
[0032]
The 50% distillation temperature of the distillation properties of the gas oil composition of the present invention is preferably 250 ° C. or more from the viewpoints of ensuring fuel consumption, engine output, startability at high temperatures, and stability of engine rotation during idling. , More preferably at least 255 ° C, even more preferably at least 260 ° C, even more preferably at least 265 ° C, most preferably at least 270 ° C. On the other hand, the 50% distillation temperature is preferably 310 ° C. or lower, more preferably 300 ° C. or lower, still more preferably 295 ° C. or lower, and most preferably 290 ° C. or lower, from the viewpoint of preventing PM discharged from the engine from increasing. It is.
[0033]
The 95% distillation temperature of the distillation properties of the gas oil composition of the present invention is preferably 285 ° C. or more, more preferably 285 ° C. or more, from the viewpoints of startability at high temperatures, stability of engine rotation during idling, and fuel consumption rate. Is at least 295 ° C, more preferably at least 300 ° C, still more preferably at least 305 ° C, most preferably at least 310 ° C. On the other hand, the 95% distillation temperature is preferably 365 ° C or lower, more preferably 350 ° C or lower, still more preferably 335 ° C or lower, even more preferably 330 ° C or lower, from the viewpoint of preventing PM from increasing from the engine. Most preferably, it is 325 ° C or lower.
[0034]
The end point of the distillation properties of the gas oil composition of the present invention is preferably 300 ° C. or higher, more preferably 310 ° C. or higher, from the viewpoints of startability at a high temperature, stability of engine rotation during idling, and fuel consumption rate. , Most preferably 315 ° C or higher. On the other hand, the distillation end point is preferably 380 ° C. or lower, more preferably 360 ° C. or lower, further preferably 350 ° C. or lower, still more preferably 345 ° C. or lower, from the viewpoint of preventing the PM discharged from the engine from increasing. Preferably it is 340 ° C or lower, most preferably 335 ° C or lower.
[0035]
Although the density at 15 ° C. of the gas oil composition of the present invention is not particularly limited, it is 850 kg / m 2 from the viewpoint of preventing an increase in PM discharged from the engine. ³ Preferably 845 kg / m ³ 840 kg / m is more preferable. ³ And more preferably 838 kg / m ³ Even more preferably 835 kg / m ³ It is most preferred that: On the other hand, the density is 810 kg / m2 from the viewpoint of ensuring the fuel consumption rate, engine output, startability at high temperatures, and stability of engine rotation during idling. ³ 815 kg / m ³ More preferably, it is 820 kg / m ³ More preferably, it is 822 kg / m ³ It is most preferred that this is the case. The density at 15 ° C. here means a value measured according to JIS K2249 “Crude oil and petroleum products—Density test method and density / mass / volume conversion table”.
[0036]
Although the aromatic content of the gas oil composition of the present invention is not particularly limited, the total aromatic content is preferably 30% by volume or less from the viewpoint of preventing the increase in PM discharged from the engine. %, More preferably 25% by volume or less, and most preferably 23% by volume or less. On the other hand, the total aromatic content is preferably 5% by volume or more, more preferably 7% by volume or more, and preferably 10% by volume or more, from the viewpoint of the swelling characteristics of the fuel system rubber member and the fuel consumption rate. More preferably, it is even more preferably 12% by volume or more, and most preferably 15% by volume or more. In addition, the content of the polycyclic aromatic compound having two or more rings is preferably 6% by volume or less, more preferably 3% by volume or less, and more preferably 2% by volume or less, from the viewpoint of preventing the PM discharged from the engine from increasing. It is most preferred that: The whole aromatics and polycyclic aromatics as used herein are measured by the Japan Petroleum Institute, Japan Standard, JPI-5S-49-97, "Hydrocarbon Type Test Method-High Performance Liquid Chromatography". Mean value.
[0037]
The slope of the linear regression line determined from the content of normal paraffin having 20 to 25 carbon atoms of the gas oil composition of the present invention is preferably 0.29 or less from the viewpoint of preventing filter clogging of diesel vehicles at low temperatures, It is more preferably 0.25 or less, further preferably 0.21 or less, still more preferably 0.18 or less, still more preferably 0.15 or less, and 0.13 or less. It is most preferred that:
Note that the slope of the linear regression line obtained from the content of normal paraffins having 20 to 25 carbon atoms can be obtained by the following method. First, normal paraffin components in a sample are separated and measured as peaks having 20 to 25 carbon atoms by gas chromatography. The obtained area of normal paraffin of each carbon number is divided by the total area of all components including components other than normal paraffin, and the content of normal paraffin of each carbon number is determined by mass%. Next, the content of each of these is set on the Y axis, and the X axis is set to 5 carbon atoms, 5 carbon atoms, 21 carbon atoms, 3 carbon atoms, 22 carbon atoms, 2 carbon atoms, 2 carbon atoms, and 1 carbon atoms. , And determining the linear regression line for these plots, the slope of the linear regression line for the substrate can be specified.
[0038]
The light oil composition of the present invention preferably contains a lubricity improver from the viewpoint of ensuring lubricity in the injection pump.
The kind of the lubricity improver is not particularly limited, but one or more of lubricity improvers such as ester type, carboxylic acid type, alcohol type, phenol type and amine type can be used. . Among them, from the viewpoint of versatility, use of an ester-based or carboxylic acid-based lubricity improver is preferred. Further, an ester-based lubricity improver is preferred from the viewpoint that the effect of addition to the addition concentration is unlikely to reach saturation and the WS1.4 value of HFRR can be further reduced. Carboxylic acid-based lubricity improvers are preferred from the viewpoint that there is a possibility that the addition amount of carboxylic acid can be reduced.
[0039]
Examples of the ester-based lubricity improver include carboxylate esters of glycerin. The carboxylic acid constituting the carboxylic acid ester may be one kind or two or more kinds, and specific examples thereof include linoleic acid, oleic acid, salicylic acid, palmitic acid, myristic acid, and hexadecenoic acid. . Examples of the carboxylic acid-based lubricity improver include linoleic acid, oleic acid, salicylic acid, palmitic acid, myristic acid, hexadecenoic acid and the like, and one or more of these can be used arbitrarily. is there.
[0040]
When the lubricity improver is added, the addition amount is preferably from 25 to 500 mg / L, more preferably from 25 to 300 mg / L, even more preferably from 25 to 200 mg / L. Thus, the HFRR is preferably added so that the WS1.4 value is preferably 460 μm or less, more preferably 420 μm or less, and most preferably 400 μm or less. Commercially available products referred to as lubricity improvers are generally obtained in a state where active ingredients contributing to lubricity are diluted with an appropriate solvent. When such a commercially available product is added to the gas oil composition of the present invention, the above-mentioned addition amount means the addition amount as an active ingredient.
In addition, when the gas oil composition of the present invention contains a low-temperature fluidity improver and the low-temperature fluidity improver also has a lubricity improving effect, the low-temperature flowability improver and the lubricity improver are combined. Thus, the lubricity can be improved.
[0041]
The light oil composition of the present invention reduces the pour point, suppresses the rise of the clogging point when mixed with another light oil composition containing a low-temperature fluidity improver, and prevents the filter blockage of diesel vehicles. From the viewpoint, if necessary, a low-temperature fluidity improver can be contained.
The type of the low-temperature fluidity improver is not particularly limited, for example, ethylene-unsaturated ester copolymer represented by ethylene-vinyl acetate copolymer, alkenyl succinamide, dibehenate of polyethylene glycol Linear nitrogen compounds such as phthalic acid, ethylenediaminetetraacetic acid, and reaction products of hydrocarbyl-substituted amines with acids or anhydrides thereof such as nitriloacetic acid; alkyl fumarate or alkyl itaconate-unsaturated ester One or more low-temperature fluidity improvers such as a comb-shaped polymer made of a copolymer or the like can be used. Among these, from the viewpoint of versatility, ethylene-vinyl acetate copolymer additives can be preferably used. When the low-temperature fluidity improver is added, the addition amount is preferably from 50 to 500 mg / L, particularly preferably from 50 to 300 mg / L. In addition, since the active ingredient which contributes to low temperature fluidity may be diluted with a suitable solvent, the product marketed as a low temperature fluidity improver may be used in the light oil composition of the present invention. In the case of adding, the above addition amount means the addition amount as an active ingredient.
[0042]
In the light oil composition of the present invention, any additive other than the lubricity improver and the low-temperature fluidity improver can be appropriately compounded without departing from the properties specified in the present invention. As these additives, nitrate esters represented by 2-ethylhexyl nitrate, cetane improvers such as organic peroxides, alkenyl succinic acid derivatives, detergents such as amine salts of carboxylic acids, phenols, Antioxidants such as amines, metal deactivators such as salicylidene derivatives, antifreezing agents such as polyglycol ether, corrosion inhibitors such as aliphatic amines and alkenyl succinates, anionic, cationic and amphoteric interfaces Examples include an antistatic agent such as an activator, a coloring agent such as an azo dye, and a defoaming agent such as a silicon type. These other additives can be added alone or in combination of several kinds. The addition amount is also optional, but it is usually 0.5% by mass or less, preferably 0.2% by mass or less based on the total amount of the gas oil composition based on the total amount of other additives.
[0043]
In the light oil composition of the present invention, the total insoluble content after the oxidation stability test is preferably 2.0 mg / 100 mL or less, more preferably 1.0 mg / 100 mL or less, from the viewpoint of storage stability. , More preferably 0.5 mg / 100 mL or less, even more preferably 0.3 mg / 100 mL or less, even more preferably 0.2 mg / 100 mL or less, and 0.1 mg / 100 mL or less. Most preferably. The oxidation stability test referred to herein is a test carried out at 95 ° C. for 16 hours under oxygen bubbling according to ASTM D2274-94. Further, from the viewpoint of storage stability and compatibility with members, the peroxide value after this oxidation stability test is preferably 10 ppm by mass or less, more preferably 5 ppm by mass or less, and 3 ppm by mass or less. It is still more preferably at most 2 ppm by mass, still more preferably at most 2 ppm by mass, most preferably at most 1 ppm by mass. Here, the peroxide value means a value measured according to the Japan Petroleum Institute standard JPI-5S-46-96. In order to reduce the total insoluble content and the peroxide value, additives such as an antioxidant and a metal deactivator can be appropriately added to the light oil composition of the present invention.
[0044]
The conductivity of the gas oil composition of the present invention is not particularly limited, but is preferably 50 pS / m or more from the viewpoint of safety. An antistatic agent and the like can be appropriately added to the light oil composition of the present invention in order to improve the electrical conductivity. Here, the electrical conductivity means a value measured in accordance with JIS K2276 "Petroleum products-aviation fuel oil test method".
[0045]
The cetane number of the light oil composition of the present invention is preferably 50.0 or more, more preferably 52.0 or more, still more preferably 54.0 or more, from the viewpoint of engine ignitability. Most preferably, it is not less than 0.0. In particular, when the cetane index of the light oil composition of the present invention is less than 50.0, and particularly when the cetane index is less than 47.0, the cetane number is adjusted to 50.0 or more by adding a cetane number improver. Is preferred. In addition, even when the cetane index is 50.0 or more, the ignitability of the engine is further improved by adding a cetane number improver to improve the engine startability at a low temperature and to reduce white smoke at the start. Can be. Here, the cetane number and the cetane index mean values measured and calculated according to JIS K2280 "Petroleum products-fuel oil-Octane number and cetane number test method and cetane index calculation method". In addition, the cetane index in the above JIS is not applied to light oil to which a cetane number improver is added, but in the present invention, the cetane index of the light oil to which a cetane number improver is added also means a value calculated by the above JIS. .
[0046]
Although the method for producing the gas oil composition of the present invention is not particularly limited, (A) a sulfur content of 50 mass ppm or less, a 90% distillation temperature of 300 ° C. or more and 350 ° C. or less, and the content of normal paraffin having 27 carbon atoms A base material having an amount of less than 0.006% by mass, 50 to 100% by volume based on the total amount of the composition, (B) a sulfur content of 50% by mass or less, a 90% distillation temperature of 200 ° C or more and less than 300 ° C, and a carbon number It is preferable that a base material having a total amount of 20 or more normal paraffins of 0.02% by mass or less is mixed with 0 to 50% by volume based on the total amount of the composition.
[0047]
Further, as the base material (A), (A1) a 90% distilling temperature is obtained by hydrodesulfurizing a raw oil containing 50% by volume or more of a straight-run gas oil having a 305 ° C to 340 ° C or less. % Of a hydrodesulfurized gas oil base material having a distillation temperature of 330 ° C. or less, based on the total amount of the composition, and 50 to 100% by volume, and (A2) a hydrocracking apparatus having a sulfur content of 15 mass ppm or less obtained from a hydrocracking apparatus. It is more preferable to produce a light oil by blending 0 to 50% by volume based on the total amount of the composition.
[0048]
The base material of (A1) is hydrodesulfurized light oil obtained by hydrodesulfurization treatment. The feedstock preferably contains at least 50% by mass of straight-run gas oil obtained from atmospheric distillation of crude oil, more preferably at least 70% by volume, even more preferably at least 80% by volume, and at least 85% by volume. Most preferably. The 90% distillation temperature of the straight-run gas oil is preferably 340 ° C or lower, more preferably 335 ° C or lower, further preferably 330 ° C or lower, most preferably 325 ° C or lower, from the viewpoint of ease of desulfurization. On the other hand, the lower limit of the 90% distilling temperature of the straight-run gas oil is not particularly limited. However, from the viewpoints of startability at a high temperature, stability of engine rotation at idling, and fuel consumption rate, 305 ° C. or higher is required. Preferably, 310 ° C. or higher is most preferable.
[0049]
Examples of the base material to be mixed with the straight-run gas oil and subjected to hydrodesulfurization treatment include a catalytic cracking gas oil (LCO) obtained from a fluid catalytic cracking device, a gas oil fraction (MHC-GO) obtained from a mild hydrocracking device, and the like. . The 90% distillation temperature of the LCO to be mixed is usually 300 ° C. or higher, preferably 360 ° C. or lower, more preferably 350 ° C. or lower, still more preferably 340 ° C. or lower, and more preferably 330 ° C. or lower in terms of ease of desulfurization. Even more preferred is 325 ° C. or less. Further, the mixing amount of LCO is preferably 30% by volume or less, more preferably 20% by volume or less, and most preferably 15% by volume or less, from the viewpoint of easiness of desulfurization and prevention of decrease in cetane index. The 90% distillation temperature of the MHC-GO to be mixed is usually 300 ° C. or higher, preferably 360 ° C. or lower, more preferably 350 ° C. or lower, still more preferably 340 ° C. or lower, and more preferably 330 ° C. from the viewpoint of ease of desulfurization. The following is even more preferable, and the temperature is most preferably 325 ° C or lower. From the viewpoint of preventing a decrease in the cetane index, the mixing amount of MHC-GO is preferably 30% by volume or less, more preferably 20% by volume or less, and most preferably 15% by volume or less. .
[0050]
The catalyst for the hydrodesulfurization treatment is not particularly limited, but a Co-Mo-based, Ni-Mo-based, Ni-Co-Mo-based, or Ni-W-based catalyst can be used. From the viewpoint, Co-Mo-based and Ni-Mo-based catalysts are preferred.
The conditions of the hydrodesulfurization treatment are not particularly limited, but generally, the hydrogen partial pressure is preferably 3.0 MPa or more, more preferably 3.5 MPa or more, still more preferably 3.8 MPa or more, and more preferably 4.0 MPa or more. Is most preferred. On the other hand, in general, the hydrogen partial pressure is preferably 10.0 MPa or less, more preferably 8.0 MPa or less, and most preferably 6.5 MPa. In general, the reaction temperature is preferably 300 ° C. or higher, more preferably 330 ° C. or higher, still more preferably 340 ° C. or higher, and most preferably 350 ° C. or higher. On the other hand, in general, the reaction temperature is preferably 420 ° C. or lower, more preferably 400 ° C. or lower, still more preferably 390 ° C. or lower, and most preferably 380 ° C. or lower. Further, in general, the liquid hourly space velocity is preferably 4.0 / h or less, more preferably 2.0 / h or less, and most preferably 1.8 / h or less. On the other hand, in general, the liquid hourly space velocity is preferably 0.3 / h or more, more preferably 0.4 / h or more, and most preferably 0.5 / h or more.
In addition, if necessary, an aromatic hydrogenation process, a hydrodewaxing process, or the like can be combined with the hydrodesulfurization process.
[0051]
The sulfur content of the base material (A1) obtained by the hydrodesulfurization treatment is preferably 50 mass ppm or less, and more preferably 30 mass ppm or less from the viewpoint of exhaust gas purification performance of a post-treatment device for a diesel vehicle. Is more preferably 15 mass ppm or less, still more preferably 10 mass ppm or less, still more preferably 5 mass ppm or less, and most preferably 1 mass ppm or less. .
[0052]
The 90% distillation temperature of the base material (A1), which is a hydrodesulfurized gas oil, is preferably 330 ° C. or lower, more preferably 325 ° C. or lower, and most preferably 320 ° C. or lower, from the viewpoint of suppressing an increase in PM discharged from the engine. . On the other hand, the 90% distillation temperature of the base material (A1) is preferably 300 ° C. or higher, and most preferably 305 ° C. or higher, from the viewpoints of startability at a high temperature, securing the stability of engine rotation during idling, and fuel consumption rate. .
[0053]
Further, the content of normal carbon having 27 carbon atoms in the base material (A1), which is a hydrodesulfurized gas oil, is preferably less than 0.006% by mass, from the viewpoint of preventing filter blockage of diesel vehicles, and is preferably 0.004% by mass. % By mass, more preferably 0.003% by mass or less, even more preferably 0.002% by mass or less, and most preferably 0.001% by mass or less.
[0054]
The difference between the 90% distillation temperature and the 50% distillation temperature of the distillation properties of the base material (A1), which is a hydrodesulfurized gas oil, is the balance between prevention of filter blockage in diesel vehicles at low temperatures, and practical performance and exhaust gas purification performance. From the viewpoint, it is preferably 55 ° C. or lower, more preferably 45 ° C. or lower, still more preferably 40 ° C. or lower, even more preferably 35 ° C. or lower, and still more preferably 30 ° C. or lower. And most preferably at 25 ° C. or less.
[0055]
Further, the difference between the 90% distillation temperature and the 10% distillation temperature of the distillation properties of the base material (A1), which is a hydrodesulfurized gas oil, is due to the prevention of filter clogging of diesel vehicles at low temperatures and the practical performance and exhaust gas purification performance. From the viewpoint of compatibility, it is preferably 120 ° C. or lower, more preferably 100 ° C. or lower, still more preferably 80 ° C. or lower, even more preferably 60 ° C. or lower, and still more preferably 55 ° C. Or less, most preferably 50 ° C. or less.
[0056]
Furthermore, the difference between the 95% distillation temperature and the 90% distillation temperature of the distillation properties of the base material (A1), which is a hydrodesulfurized gas oil, is due to the prevention of filter clogging of diesel vehicles at low temperatures and the practical performance and exhaust gas purification performance. From the viewpoint of compatibility, the temperature is preferably 15 ° C. or lower, more preferably 12 ° C. or lower, still more preferably 10 ° C. or lower, even more preferably 9 ° C. or lower, and 8 ° C. or lower. Is even more preferable, and the temperature is most preferably 7 ° C. or lower.
[0057]
Furthermore, the difference between the distillation end point and the 95% distillation temperature of the base material (A1), which is a hydrodesulfurized gas oil, is based on the viewpoint of preventing filter clogging of diesel vehicles at low temperatures and achieving both practical performance and exhaust gas purification performance. Therefore, the temperature is preferably 15 ° C. or lower, more preferably 13 ° C. or lower, further preferably 11 ° C. or lower, still more preferably 10 ° C. or lower, and further preferably 9 ° C. or lower. It is even more preferable, and most preferably 8 ° C. or lower.
[0058]
The slope of the linear regression line obtained from the content of normal paraffin having 20 to 25 carbon atoms of the base material (A1), which is a hydrodesulfurized gas oil, is 0.35 or less from the viewpoint of preventing filter blockage of diesel vehicles at low temperatures. It is preferably, more preferably 0.30 or less, further preferably 0.25 or less, and most preferably 0.20 or less.
[0059]
The base material (A2) is hydrocracked gas oil obtained from the hydrocracker. Hydrocracking equipment is used to pass heavy feedstocks such as heavy gas oil and vacuum gas oil over a catalyst that has a dual function of cracking and hydrogenation under high-temperature and high-pressure hydrogen conditions. It is a device that performs denitrification and the like. The resolution of the catalyst is mainly due to the porous solid acid carrier, and its components are used in an amorphous system such as silica-alumina, silica-magnesia, silica-zirconia, and silica-titania. The modified zeolite is used. Hydrogenation ability is exhibited by supporting two or three kinds of metals such as Ni, Co, Mo, W, Pd, and Pt in combination. Among them, a combination of Co-Mo, Ni-Mo, and Ni-W is preferable. preferable. The hydrogenolysis apparatus has a hydrogen pressure of 8 MPa or more, preferably 10 MPa or more and 25 MPa or less, a reaction temperature of 300 ° C. or more, preferably 350 ° C. or more and 500 ° C. or less, 0.1 / h or more and 2.0 / h or less. It is operated at a liquid hourly space velocity of preferably 1.0 / h or less, and a decomposition rate of 40% or more, preferably 50% or more, more preferably 60% or more is obtained.
[0060]
The sulfur content of the base material (A2), which is hydrocracked gas oil, is preferably 15 ppm by mass or less, more preferably 10 ppm by mass or less, from the viewpoint of exhaust gas purification performance of a post-treatment device for a diesel vehicle. Is more preferably 3 ppm by mass or less, still more preferably 2 ppm by mass or less, and still more preferably 1 ppm by mass or less.
[0061]
The 90% distillation temperature of the base material (A2), which is a hydrocracked gas oil, is preferably 350 ° C. or less from the viewpoint of suppressing an increase in PM discharged from the engine. On the other hand, the 90% distillation temperature of the base material (A2) is preferably 300 ° C. or higher, more preferably 310 ° C. or higher, from the viewpoints of startability at a high temperature, stability of engine rotation during idling, and fuel consumption rate. , 320 ° C or higher is most preferable.
[0062]
In addition, the content of normal carbon having 27 carbon atoms in the base material (A2), which is a hydrocracked gas oil, is preferably less than 0.006% by mass, from the viewpoint of preventing filter clogging of diesel vehicles, and is preferably 0.004% by mass. % By mass, more preferably 0.003% by mass or less, even more preferably 0.002% by mass or less, and most preferably 0.001% by mass or less.
[0063]
The difference between the 90% distillation temperature and the 50% distillation temperature in the distillation properties of the base material (A2), which is a hydrocracked gas oil, is the balance between the prevention of filter clogging of diesel vehicles at low temperatures and the practical performance and exhaust gas purification performance. In view of this, the temperature is preferably 55 ° C or lower, more preferably 50 ° C or lower, still more preferably 45 ° C or lower, still more preferably 40 ° C or lower, and most preferably 35 ° C or lower.
[0064]
In addition, the difference between the 90% distillation temperature and the 10% distillation temperature of the distillation properties of the base material (A2), which is hydrocracked gas oil, is due to the prevention of filter clogging of diesel vehicles at low temperatures and the practical performance and exhaust gas purification performance. From the viewpoint of compatibility, it is preferably 120 ° C. or lower, more preferably 100 ° C. or lower, still more preferably 80 ° C. or lower, even more preferably 70 ° C. or lower, and still more preferably 60 ° C. or lower. Or less, most preferably 55 ° C. or less.
[0065]
Furthermore, the difference between the 95% distillation temperature and the 90% distillation temperature of the distillation properties of the base material (A2), which is a hydrocracked gas oil, is due to the prevention of filter blockage of diesel vehicles at low temperatures and the practical performance and exhaust gas purification performance. From the viewpoint of compatibility, the temperature is preferably 15 ° C. or lower, more preferably 12 ° C. or lower, still more preferably 10 ° C. or lower, even more preferably 9 ° C. or lower, and 8 ° C. or lower. Is even more preferable, and the temperature is most preferably 7 ° C. or lower.
[0066]
Furthermore, the difference between the distillation end point and the 95% distillation temperature of the base material (A1), which is a hydrodesulfurized gas oil, is based on the viewpoint of preventing filter clogging of diesel vehicles at low temperatures and achieving both practical performance and exhaust gas purification performance. Therefore, the temperature is preferably 15 ° C. or lower, more preferably 13 ° C. or lower, further preferably 11 ° C. or lower, still more preferably 10 ° C. or lower, and further preferably 9 ° C. or lower. It is even more preferable, and most preferably 8 ° C. or lower.
[0067]
The slope of the linear regression line obtained from the content of normal paraffin having 20 to 25 carbon atoms of the base material (A1), which is a hydrodesulfurized gas oil, is 0.35 or less from the viewpoint of preventing filter blockage of diesel vehicles at low temperatures. It is preferably, more preferably 0.30 or less, further preferably 0.25 or less, and most preferably 0.20 or less.
[0068]
The sulfur content of the base material (B) is preferably 50 mass ppm or less, more preferably 30 mass ppm or less, and preferably 15 mass ppm or less, from the viewpoint of exhaust gas purification performance of a post-treatment device for a diesel vehicle. Is still more preferably 10 ppm by mass or less, still more preferably 5 ppm by mass or less, even more preferably 1 ppm by mass or less.
[0069]
Further, the 90% distillation temperature of the base material (B) is preferably 200 ° C. or more, and more preferably 220 ° C. or more, from the viewpoint of suppressing the increase in HC discharged from the engine and ensuring safety when handling the gas oil composition. More preferably, it is most preferably 230 ° C. or higher. On the other hand, the 90% distillation temperature of the base material (B) is preferably 300 ° C. or lower, more preferably 280 ° C. or lower, and more preferably 270 ° C. or lower, from the viewpoint of preventing filter blockage of diesel vehicles. Is still more preferably 265 ° C. or less, and most preferably 260 ° C. or less.
Further, the 95% distillation temperature of the base material (B) is preferably 310 ° C. or lower, more preferably 300 ° C. or lower, and more preferably 270 ° C. or lower, from the viewpoint of preventing filter clogging of diesel vehicles. Is still more preferably 268 ° C or less, and most preferably 265 ° C or less.
[0070]
The total amount of normal paraffins having 20 or more carbon atoms of the base material (B) is preferably 0.02% by mass or less, and more preferably 0.01% by mass or less, from the viewpoint of preventing filter blockage of diesel vehicles. Preferably, it is 0.005% by mass or less, still more preferably 0.003% by mass or less, and most preferably 0.001% by mass or less.
[0071]
Specific examples of the base material (B) include hydrodesulfurized kerosene obtained by hydrorefining straight-run kerosene obtained from atmospheric distillation of crude oil, and hydrocracked kerosene obtained from a hydrocracking apparatus. Can be
[0072]
The light oil composition of the present invention can be produced by blending (B) as needed with the base material (A). The amount of the base material (A) is preferably from 50 to 100% by volume, more preferably from 60 to 100% by volume, and most preferably from 70 to 100% by volume, based on the total amount of the composition. When the base material (A1) is compounded as one of the base materials (A), the amount of the base material (A1) is preferably 50 to 100% by volume, more preferably 70 to 100% by volume, based on the total amount of the composition. preferable. When the base material (A2) is compounded as one of the base materials (A), the amount of the base material (A2) is preferably 0 to 50% by volume, and 0 to 30% by volume based on the total amount of the composition. Is more preferred. In addition, as the base material (A), both the base material (A1) and the base material (A2) can be blended. On the other hand, the amount of the base material (B) is preferably 0 to 50% by volume, more preferably 0 to 40% by volume, and most preferably 0 to 30% by volume.
[0073]
Further, the light oil composition of the present invention can also contain other base materials other than the base materials (A) and (B). As the other substrate, for example, a substrate having a sulfur content obtained from a mild hydrocracking apparatus of more than 50 mass ppm and not more than 120 mass ppm and a 90% distillation temperature of 280 ° C. or more and 310 ° C. or less is defined in the present invention. Within a range not departing from the range described above, 0 to 40% by volume based on the total amount of the composition can be blended. A mild hydrocracking device is a device that uses a reduced pressure gas oil as a raw material and has a hydrogen partial pressure of 3.5 MPa or more and 10.0 MPa or less, more generally less than 8.0 MPa, a reaction temperature of 350 ° C. or more and 420 ° C. or less, and a liquid hourly space velocity of 0.2. It is a device that performs desulfurization and the like while decomposing at a decomposition ratio of 15% or more and less than 40% under the condition of / h to 2.5 / h.
[0074]
【The invention's effect】
The gas oil composition of the present invention does not cause filter clogging at a low temperature even though it is a low sulfur gas oil composition having a sulfur content of 50 mass ppm or less, and also satisfies practical performance and exhaust gas purification performance. Is what you do.
[0075]
【Example】
[Examples 1 to 5 and Comparative Examples 1 and 2]
A 90% distillation temperature obtained by atmospheric distillation of a Middle Eastern crude oil is a straight-run gas oil 1 having a temperature of 310 ° C., a Ni—Mo catalyst, a hydrogen partial pressure of 5.6 MPa, a reaction temperature of 360 ° C., and a liquid space. Hydrodesulfurization treatment at a rate of 1.4 / h yielded hydrodesulfurized light oil 1 as base material (A1). Further, a 90% distillation temperature obtained by normal pressure distillation of Middle Eastern crude oil, a straight-run gas oil 2 having a temperature of 320 ° C was used as a feed oil, a Co-Mo catalyst was used, a hydrogen partial pressure was 5.6 MPa, a reaction temperature was 360 ° C, The hydrodesulfurization treatment was performed at a liquid hourly space velocity of 1.8 / h to obtain a hydrodesulfurized light oil 2 as the base material (A1). Table 1 shows the properties of the hydrodesulfurized gas oils 1 and 2. Table 2 shows the properties of the hydrocracked gas oils 1 and 2 as the base material (A2), and Table 3 shows the properties of the hydrodesulfurized kerosene and hydrocracked kerosene as the base material (B). The light oil base materials of Tables 1 to 3 are mixed at the compounding ratio shown in Table 4, and a lubricity improver and, if necessary, a low-temperature fluidity improver at a concentration shown in Table 4 are added thereto. Of light oil compositions (Examples 1 to 5) and light oil compositions for comparison (Comparative Examples 1 and 2) were prepared. The properties of these gas oil compositions are shown in Table 5.
[0076]
Next, various tests described below were performed on each of the light oil compositions of Examples 1 to 5 and Comparative Examples 1 and 2.
(Low temperature actual vehicle test)
At room temperature on a chassis dynamometer capable of controlling the environmental temperature, (1) flushing (washing) the fuel system of the test diesel vehicle with the evaluation fuel, (2) extracting the flushing fuel, (3) a new main filter (4) A prescribed amount of the evaluation fuel (1/2 of the fuel tank capacity of the test vehicle) is inserted into the fuel tank. Thereafter, (5) the ambient temperature is rapidly cooled from room temperature to 5 ° C., (6) the temperature is maintained at 5 ° C. for 1 hour, and (7) the temperature is gradually cooled at a cooling rate of 1 ° C./h until the temperature reaches −10 ° C. 8) After holding at -10 ° C for 1 hour, the running test is started. The running test consisted of (9) starting the engine, (10) idling for 5 minutes, (11) accelerating to 50 km / h, and (12) running for 1 hour at 50 km / h. judge. If there was no problem in starting the engine, idling, and acceleration, and the vehicle was able to maintain 50 km / h traveling over the entire traveling, it was evaluated as good (◎). In the first cranking, minor problems occurred, such as when the engine could not be started or when the vehicle speed temporarily decreased during running but recovered afterwards, but it was judged as acceptable (○) if running could be continued . If the vehicle could not be started (when the cranking for 10 seconds was repeated five times at intervals of 30 seconds but the vehicle did not start), and the running could not be maintained due to idling stall, engine stop, etc., it was determined to be impossible (x). In the low-temperature actual vehicle test, the following two diesel vehicles A and B were used.
[0077]
Vehicle A is a diesel truck compliant with short-term regulations equipped with a PM reduction device (using low sulfur gas oil) specified by Tokyo Metropolitan Government. The specifications are as follows.
(Vehicle A specifications)
Maximum loading capacity: 2t
Engine type: In-line 4-cylinder diesel
Engine total displacement: 4.3L
Fuel injection pump: row type
Conformity regulations: Short-term emission regulations compliant (base vehicles)
Exhaust gas aftertreatment device: PM reduction device specified by Tokyo (Category 4 compliant)
Fuel used for PM reduction equipment: low sulfur gas oil (sulfur content 50 mass ppm or less)
[0078]
Vehicle B is a sports utility vehicle that conforms to long-term regulations. The specifications are as follows.
(Vehicle B specifications)
Engine Type: Supercharged 4-cylinder diesel with intercooler
Displacement: 3.0L
Fuel injection system: common rail system
Conformity regulations: Conforms to long-term emission regulations
Exhaust gas aftertreatment device: oxidation catalyst
[0079]
(High temperature startability test)
In a room where the environmental temperature can be controlled, the test vehicle is supplied with 15 L of the evaluation fuel, and after setting the environmental temperature to 35 ° C., the engine is started and the engine is held at idling. When the temperature of the fuel injection pump outlet of the idling vehicle is stabilized, the engine is stopped, left for 5 minutes, and then restarted. At this time, when the engine started normally, the test was passed (合格), and when the engine was not started, the test was failed (x).
[0080]
The vehicle C used in the high-temperature startability test is a diesel truck of a low-pollution vehicle conforming to long-term regulations and designated by seven prefectures. The specifications are as follows.
(Vehicle C specifications)
Maximum loading capacity: 4t
Engine type: In-line 6 cylinder diesel
Engine total displacement: 8.2L
Fuel injection pump: High pressure distribution type
Conformity regulations: Conforms to long-term emission regulations (low-emission vehicles designated by seven prefectures)
Exhaust gas aftertreatment device: oxidation catalyst
[0081]
The results of the test are as shown in Table 5, and the light oil compositions of Comparative Examples 1 and 2 failed either the low-temperature actual vehicle test or the high-temperature startability test using two vehicles, The light oil compositions of Examples 1 to 5 passed both the low-temperature actual vehicle test and the high-temperature startability test using two vehicles.
[0082]
[Table 1]

[0083]
[Table 2]

[0084]
[Table 3]

[0085]
[Table 4]

[0086]
[Table 5]

Claims (5)

The sulfur content is 50 mass ppm or less, the slow cloud point is -8.0 ° C or less, the content of normal paraffin having 27 carbon atoms in the composition is less than 0.003 mass%, the 90% distillation temperature and the 50% distillation Discharge temperature difference is 55 ° C or less, difference between 90% and 10% distillate temperatures is 120 ° C or less, pour point is -7.5 ° C or less, clogging point is -5 ° C or less, and cetane index is 45. The kinematic viscosity at 30 ° C or more is 2.5 to 6.0 mm ² / s, the 90% distillation temperature is 350 ° C or less, the WS1.4 value of HFRR is 460 µm or less, and the flash point is 50 ° C or more and 10%. A light oil composition characterized in that the residual carbon content of the residual oil is 0.1% by mass or less. The gas oil according to claim 1, wherein the difference between the 95% distillation temperature and the 90% distillation temperature is 15 ° C or less, and the difference between the distillation end point and the 95% distillation temperature is 15 ° C or less. Composition. The light oil composition according to claim 1, comprising 25 to 500 mg / L of a lubricity improver. (A) A base material having a sulfur content of 50 mass ppm or less, a 90% distillation temperature of 300 ° C. or more and 350 ° C. or less, and a content of normal paraffin having 27 carbon atoms of less than 0.006 mass%, based on the total amount of the composition 50 to 100% by volume, (B) a base material having a sulfur content of 50 mass ppm or less, a 90% distillation temperature of 200 ° C or more and less than 300 ° C, and a total amount of normal paraffins having 20 or more carbon atoms of 0.02 mass% or less, The method for producing a gas oil composition according to any one of claims 1 to 3, wherein 0 to 50% by volume is blended based on the total amount of the composition. As the base material (A) according to the preceding paragraph, (A1) a 90% distilling temperature of a 90% distillate obtained by hydrodesulfurizing a raw oil containing 50% by volume or more of a straight-run gas oil having a temperature of 305 ° C or more and 340 ° C or less. A hydrodesulfurized gas oil base material having an output temperature of 330 ° C. or less, 50 to 100% by volume based on the total amount of the composition, and (A2) a hydrocracked gas oil having a sulfur content of 15 mass ppm or less obtained from a hydrocracking apparatus are used. The method for producing a gas oil composition according to claim 4, wherein 0 to 50% by volume is blended based on the total amount of the composition.