JP2007204764A - High power diesel oil composition - Google Patents

Abstract

To provide a light oil composition capable of reducing nitrogen oxides and particulates in exhaust gas and having excellent fuel efficiency.
SOLUTION: The sulfur content is 50 ppm or less, the cetane number is 50 or more, the density at 15 ° C. is 0.82 g / cm ³ or more, the total aromatic content is 40 mass% or less, and the total aromatic content [mass% ] Is a light oil composition mainly composed of a hydrocarbon oil having a density less than the value of (density [g / cm ³ ] × 450-350).
[Selection figure] None

Description

The present invention relates to a high-power gas oil composition that is used for automobile diesel fuel and the like and that provides excellent fuel efficiency.

  Light oil is widely used as a fuel for diesel engines. Diesel engines are used for trucks, buses, ships, construction machines, and the like, and are attracting attention because of their high energy conversion efficiency and low carbon dioxide emissions.

  In addition, in order to reduce nitrogen oxides and particulates in exhaust gas, there is a demand for reduction of the aromatic content contained in light oil.

  However, reducing the aromatic content in light oil generally reduces fuel consumption.

  The present invention solves such a decrease in fuel consumption, and an object of the present invention is to provide a light oil composition that reduces nitrogen oxides, particulates, and the like in exhaust gas and that provides high fuel consumption. is there.

The light oil composition according to the present invention has a sulfur content of 50 ppm or less, a cetane number of 50 or more, a density at 15 ° C. of 0.82 g / cm ³ or more, a total aromatic content of 40% by mass or less, and a total aromatic The main component is a hydrocarbon oil whose content [% by mass] is less than the value of (density [g / cm ³ ] × 450-350).

In particular, the sulfur content is 50 ppm or less, the cetane number is 52 or more, the density at 15 ° C. is 0.82 g / cm ³ or more and 0.86 g / cm ³ or less, the total aromatic content is 25 mass% or less, 10 mass% or more, and less than the value of the total aromatic content (mass%) is (density ^{[g / cm 3] × 450-356} ), a value larger hydrocarbon oil (density ^{[g / cm 3] × 450-365} ) It is preferable to use it as a main component.

The method for producing a light oil composition according to the present invention comprises a high cetane number base material having a cetane number of 54 or more and a high density base material having a density at 15 ° C. of 0.84 g / cm ³ or more from 10:90 to The cetane number of the high cetane number base material is 5 or more higher than that of the high density base material, and the density of the high density base material is higher than that of the high cetane number base material. It is preferably 0.03 g / cm ³ or higher, and one of the 50% distillation temperature of the high cetane number base material and the high density base material is 290 ° C. or lower, and the other is preferably 300 ° C. or higher.

The high-power gas oil composition according to the present invention has a sulfur content of 50 ppm or less, a cetane number of 50 or more, a density at 15 ° C. of 0.82 or more, a total aromatic content of 40% by mass or less, and a total aromatic content. The main component is a hydrocarbon oil whose [% by mass] is less than the value of (density [g / cm ³ ] × 450-350).

  According to the present invention, the sulfur content and the aromatic content are reduced to reduce the particulate matter (PM) in the exhaust gas, and at that time, the fuel efficiency is not lowered.

  The hydrocarbon oil of the present invention can be preferably produced by mixing a high cetane number base material and a high density base material. Specifically, (a) a combination of a light high cetane number base material (hereinafter also referred to as a high cetane number light base material) and a heavy high density base material (hereinafter also referred to as a high density heavy base material), (B) A combination of a heavy high cetane number base material (hereinafter also referred to as a high cetane number heavy base material) and a light high density base material (hereinafter also referred to as a high density light base material) is preferable. Usually, the hydrocarbon oil of the present invention is prepared by mixing a high cetane number base material and a high density base material in a weight ratio of 90:10 to 10:90, preferably 80:20 to 20:80.

  A combination of a heavy diesel oil base with a high cetane number and a low density and a light diesel oil base with a high cetane number and a low density has a low fuel consumption, and a light diesel oil base and a cetane number with a low cetane number and a high density. However, a sufficient cetane number cannot be obtained in combination with a heavy gas oil base having a low density and a high density.

Preferred properties of the hydrocarbon oil include a sulfur content of 50 ppm or less, particularly 20 to 50 ppm, a cetane number of 52 or more, particularly 52 to 65, and a density at 15 ° C. of 0.82 g / cm ³ or more, particularly 0.82 to 0.86 g / cm ³ , or the total aromatic content is 30% by mass or less, particularly 30 to 10% by mass.

As a heavy gas oil base material having a high cetane number and a low density (high cetane number heavy base material), the specific gravity is less than 0.82 g / cm ³ , particularly 0.76 to 0.81 g / cm ³ , and the cetane number Is preferably 54 or higher, particularly 56 or higher, and 50% distillation temperature is 270 ° C. or higher, particularly 280 ° C. to 340 ° C. As such a base material, a base material obtained by hydrorefining a heavy gas oil fraction obtained from atmospheric distillation or vacuum distillation of crude oil can be used. The hydrorefining conditions are preferably selected so that the aromatic content is 10%, particularly 5% or less, and that hydrogenation occurs.

The properties of a high density light base material combined with a heavy gas oil base material having a high cetane number and a low density (high cetane number heavy base material) is 0.03 g / cm ³ or more than the high cetane number heavy base material. The specific gravity is high, the cetane number is 5 or lower, and the 50% distillation temperature is low. Specific properties of the high-density light base material include a specific gravity of 0.82 g / cm ³ or more, particularly 0.83 to 0.92 g / cm ³ , a cetane number of 54 or less, and a 50% distillation temperature of 300. Properties of less than ° C., particularly 250 ° C. to 300 ° C. are preferably used. Such a base material can be obtained by atmospheric distillation or vacuum distillation of crude oil, or by fractionating cracked oil obtained from petroleum fractions or other carbon sources.

As a light gas oil base material having a low cetane number and a high density (high density light base material), the specific gravity is 0.82 g / cm ³ or more, particularly 0.83 to 0.92 g / cm ³ , and the cetane number is 54 or less. In addition, properties having a 50% distillation temperature of less than 300 ° C, particularly 230 ° C to 290 ° C are preferably used. Such base materials include (1) liquefied oil using a carbon source other than crude oil such as coal liquefied oil and natural gas liquefied oil, and (2) cracked oil obtained by pyrolysis and catalytic cracking of petroleum fractions. A base material obtained by hydrorefining a light oil fraction can be used.

The properties of a high cetane heavy substrate combined with a light diesel oil substrate (high density light substrate) with a low cetane number and high density have a lower specific gravity, a higher cetane number than a high density light substrate, and 50% distillation temperature is high. Specific properties of the high-density light base material include a specific gravity of 0.82 g / cm ³ or less, particularly 0.76 to 0.81 g / cm ³ , a cetane number of 56 or more, particularly 56 to 60, and 50 A property having a% distillation temperature of 270 ° C. or higher, particularly 280 ° C. to 340 ° C. is preferably used. Such a base material can be obtained by fractionating a petroleum fraction obtained from atmospheric distillation or vacuum distillation of crude oil, and further through hydrorefining and the like.

  The light oil composition of the present invention may contain other base materials typified by oxygen-containing compounds such as ether compounds in an amount of 20% by weight, particularly up to 10% by weight. Furthermore, known fuel additives such as an abrasion resistance improver, a cetane number improver, an antioxidant, a metal deactivator, and a corrosion inhibitor may be added. As the wear resistance improver, a long chain (for example, having 12 to 24 carbon atoms) fatty acid or fatty acid ester thereof is preferably used as the wear resistance improver. Abrasion resistance is sufficiently improved with an addition amount of 10 to 500, preferably 50 to 100 ppm. Further, as a fuel for a high-speed rotating diesel engine mounted on an automobile, a 90% distillation temperature is usually 350 ° C. or lower, and a kinematic viscosity at 30 ° C. is 1.5 to 5.0 cSt.

  Hereinafter, the present invention will be described based on examples.

  Sample oil 1 as an example is a mixture of 77% by weight of a light base material and 23% by weight of a heavy base material, with 75 ppm by weight added to an abrasion resistance improver (Exdone, Paradyne 655). is there. Table 1 summarizes the properties of the test oil 1, the light base material, and the heavy base material. The light base used was a hydrorefined light light oil fraction obtained from atmospheric distillation of Southern crude oil under conditions where nuclear hydrogenation hardly occurred. The heavy substrate used was obtained by hydrorefining a heavy gas oil fraction obtained from atmospheric distillation of Middle Eastern crude oil under conditions that cause nuclear hydrogenation.

  For comparison, sample oils 2, 3, and 4 having properties shown in Table 2 were prepared. Sample oil 2 is obtained by hydrorefining a light gas oil fraction, sample oil 3 is obtained by hydrorefining a heavy gas oil fraction, and sample oil 4 is a commercial gas oil. .

  The cetane number is determined according to JIS K2280 using a CFR engine, the sulfur content is determined according to JIS K2541 amperometric oxidation method, the nitrogen content is determined according to JIS K2609 chemiluminescence method, and the aromatic content is determined according to the Japan Petroleum Institute Measurements were made in accordance with -5S-49-97.

(Exhaust gas and fuel consumption evaluation)
For the test oils 1 to 4, particulates in the exhaust gas (hereinafter referred to as TIAS 23-1992) according to the diesel vehicle 13-mode exhaust gas and particulate matter test method (TRIAS 23-1992) using a commercially available engine under the engine test conditions shown in Table 3 , PM) (collected by a mini dilution system (manufactured by Horiba Seisakusho)), HC, CO, NOx [car exhaust gas measuring device MEXA-4000, manufactured by Horiba Seisakusho]. The fuel consumption at that time was also measured. The measurement results are shown in Table 4. The measured value is shown as a relative value with the value of commercially available light oil as 100. The particulates were measured at engine speeds of 1080 rpm and 2160 rpm.

  As is clear from these results, the sample oil 1 can reduce particulates (PM) without deteriorating fuel consumption. On the other hand, the sample oil 3 shows improved fuel efficiency, but increases the particulates. The sample oil 2 can reduce the particulates, but the fuel efficiency is lowered.

  The test oil 5 which is another example is composed of 25% by weight of coal liquefied oil and 75% by weight of a heavy base material, and 75 wtppm of an abrasion resistance improver (Exdone, Paradyne 655) is added. Is. Table 5 summarizes the properties of the test oil 5, the coal liquefied oil, and the heavy base material. The heavy substrate used is obtained by hydrorefining a heavy gas oil fraction.

Claims (2)

Sulfur content is 50 ppm or less, cetane number is 50 or more, density at 15 ° C. is 0.82 g / cm ³ or more, total aromatic content is 40 mass% or less, and total aromatic content [mass%] is (density) The light oil composition which has as a main component the hydrocarbon oil less than the value of [g / cm < ³ >] * 450-350). Cetane number is 52 or more, density at 15 ° C. is 0.82 g / cm ³ or more and 0.86 g / cm ³ or less, total aromatic content is 25 mass% or less and 10 mass% or more, and total aromatic content [mass% ] is less than the value of (density ^{[g / cm 3] × 450-356} ), ( density ^{[g / cm 3] × 450-365} ) according to claim 1, wherein a value larger hydrocarbon oil as a main component of Light oil composition.