JP2014189619A - Fuel oil composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel oil composition having excellent low temperature fluidity without decreasing a cetane index.SOLUTION: Provided is a fuel oil composition having a residual carbon content of 0.2 to 1.0 mass% in 10% residual oil. The composition comprises, based on the fuel oil composition: 75 to 99 vol.% of a fuel oil base oil containing 10 to 70 vol.% of a desulfurized gas oil having a sulfur content of 10 mass ppm or less; 0.1 to 1.0 vol.% of a residual carbon adjusting material comprising at least one hydrocarbon oil selected from the group consisting of an ordinary pressure residual oil, a vacuum residual oil, a desulfurized residual oil, a slurry oil, and an extract; 0.8 to 25 vol.% of an unsaturated hydrocarbon having side chains and having 15 to 40 carbon atoms; and 1.0 to 1000 volume ppm of a flow improver.

Description

  The present invention relates to a fuel oil composition having excellent fluidity at low temperatures, and more particularly to an A heavy oil composition having excellent fluidity at low temperatures.

A heavy oil is generally used as a heater for house warming cultivation, a building heater such as a building, and a fuel for operating a boat such as a fishing boat. The problem here is flow at low temperatures. It is sex. Conventionally, this A heavy oil has a serious problem of precipitation of wax in the A heavy oil and deterioration of fluidity at low temperatures in winter or in cold regions. For example, the precipitation of wax contained in heavy oil A causes the filter in the filter to remove minute impurities in the oil to be clogged, or the heavy fuel oil loses its fluidity at low temperatures, and the fuel line itself In many cases, such as occlusion. From such problems that occur at low temperatures or in cold regions, it has been a major challenge to improve the low temperature fluidity of A heavy oil.

  Conventionally, there is a method of adding residual oil as a method for improving the fluidity of A heavy oil at low temperature, and residual oil having an asphaltene content of 6.0% by mass or more or a residual carbon content of 9.5% by mass or more. As an additive, it is known that low temperature fluidity is improved by adding 0.5 to 2.0% by volume with respect to A heavy oil base oil (see, for example, Patent Document 1). However, the method of Patent Document 1 in which a large amount of residual oil is added is not preferable from the viewpoint of generation of sludge, and the effect of improving low-temperature fluidity is not sufficient, so that it is difficult to change the base material of A heavy oil. There was a problem that it interfered with the production of heavy oil.

  As another method for improving the low temperature fluidity of heavy oil A, the 10% residual carbon content in heavy oil A, the wax content at -10 ° C, the asphaltene content and the amount of fluidity improver are important for low temperature fluidity. Based on the knowledge that it is a factor, a method for improving the low temperature fluidity of A heavy oil by setting these amounts within a specific range is known (for example, see Patent Document 2). However, as a base oil of A heavy oil used in this conventional method, a light oil containing a sulfur content of about 500 to 2000 mass ppm was used in view of the sulfur content regulation value applied at that time. The regulation of the sulfur content in light oil is becoming stricter in consideration of the influence on the environment, and so-called sulfur-free light oil of 10 ppm by mass or less is currently produced. However, this sulfur-free diesel oil has been reduced in aroma as the desulfurization rate has been improved, which reduces the dissolution performance of the diesel oil and at the same time relatively increases the amount of wax contained in the diesel oil. When light oil is used as the base oil of A heavy oil, there is a concern about deterioration of low-temperature fluidity, and therefore further improvement is required.

Japanese Patent Publication No. 3-5438 Japanese Patent No. 2640411

  This invention is made | formed in view of the said conventional condition, and makes it a subject to provide the fuel oil composition which is excellent in low-temperature fluidity | liquidity, without reducing a cetane index | exponent.

  Therefore, in order to solve the above-described problems, the present inventors have been able to obtain a fuel oil composition excellent in low-temperature fluidity without lowering the cetane index by blending a specific amount of a specific hydrocarbon compound. .

That is, the present invention relates to 75 to 99 vol% of fuel oil base oil containing 10 to 70 vol% of desulfurized gas oil having a sulfur content of 10 mass ppm or less based on the fuel oil base oil, normal pressure residual oil, vacuum residual oil, desulfurization 0.1 to 1.0% by volume of a residual coal modifier made of at least one hydrocarbon oil selected from the group consisting of residual oil, slurry oil and extract, and 15 to 40 carbon atoms having side chains 10% residual carbon content of 0.2 to 1 containing 0.8 to 25 vol% of unsaturated hydrocarbon having 1.0 to 1000 volppm of fluidity improver based on the fuel oil composition. This was solved by providing the fuel oil composition of 0.0 mass%.
Therefore, the present invention provides a fuel oil composition having a 10% residual carbon content of 0.2 to 1.0 mass%, and a desulfurized gas oil having a sulfur content of 10 mass ppm or less based on the fuel oil base oil. Residual coal comprising 75 to 99% by volume of a fuel base oil containing 70% by volume and at least one hydrocarbon oil selected from the group consisting of atmospheric residual oil, vacuum residual oil, desulfurized residual oil, slurry oil and extract. Conditioner 0.1-1.0% by volume, unsaturated hydrocarbons having 15-40 carbon atoms having side chains 0.8-25% by volume, fluidity improver 1.0-1000 ppm by volume Are each based on the said fuel oil composition, It concerns on the said fuel oil composition characterized by the above-mentioned.

  According to the present invention, it is possible to provide a fuel oil composition excellent in low-temperature fluidity, in which a desulfurized gas oil having a sulfur content of 10 mass ppm or less is used as a fuel oil base oil without reducing the cetane index. A fuel oil composition can be manufactured by adding each component. There are no particular restrictions on the method of adding each component, and the unsaturated hydrocarbon compound may be added after the residual coal modifier is first added to the fuel base oil. Conversely, the unsaturated hydrocarbon compound may be added first. The residual coal modifier may be added to the fuel oil base oil, and the residual coal modifier and the unsaturated hydrocarbon compound may be mixed in advance and then added to the fuel base oil. The fluidity improver added to the petroleum distillate fuel oil is added after each component is added or during the addition of each component.

Hereinafter, the present invention will be described in detail.
In the fuel oil composition of the present invention, an unsaturated hydrocarbon having 15 to 40 carbon atoms having a side chain is contained in an amount of 0.8 to 25% by volume based on the fuel oil composition. Even if 75 to 99 vol% of a fuel oil base oil containing 10 to 70 vol% of desulfurized diesel oil based on the fuel oil base oil standard is contained in an amount of 75 ppm to 99 vol% based on the fuel oil composition, the conventional sulfur content is 500 A low temperature fluidity comparable to that obtained when a conventional gas oil having a relatively high sulfur content of about 2000 mass% is used as the fuel oil base oil can be secured. In the present invention, if the content of the desulfurized gas oil contained in the fuel oil base oil is 70% by volume or less, excessive reduction of the aroma of the fuel oil base oil is prevented, and the solubility of paraffin due to the reduction of the aroma is reduced. Since deterioration of low-temperature fluidity due to excessive reduction is prevented, in the present invention, the content of desulfurized gas oil having a sulfur content of 10 mass ppm or less based on the fuel oil base oil is set to 70 vol% or less.

  As fuel oil base oil used in the present invention, in addition to this desulfurized light oil, straight-run kerosene or straight-run light oil obtained by distilling crude oil at normal pressure with an atmospheric distillation device, atmospheric residue with a vacuum distillation device Vacuum gas oil obtained by distillation under reduced pressure, light vacuum gas oil lighter than this vacuum gas oil, desulfurized kerosene obtained by desulfurizing straight-run kerosene with a kerosene desulfurizer, and desulfurized vacuum oil with an indirect desulfurizer Desulfurized vacuum gas oil obtained, light desulfurized gas oil obtained as a by-product in that case, heavy desulfurized gas oil, obtained as a by-product when desulfurizing normal pressure residue or vacuum residue with direct desulfurization equipment 1 or 2 types selected from direct degassed light gas oil, directly degassed light gas oil, desulfurized light vacuum gas oil obtained by desulfurizing light vacuum gas oil, light cycle oil (Light Cycle Oil: LCO) obtained from catalytic cracking equipment, etc. The above can be used, and these are blended in the fuel oil base oil in an amount of 30 to 90% by volume. When the content of the desulfurized light oil contained in the fuel oil base oil is less than 10% by volume, the fuel oil Since the sulfur content of the base oil is high and the aroma content is large, the regulations on the sulfur content and the aroma content are becoming stricter. In consideration of the influence on the environment, in the present invention, the sulfur content based on the fuel oil base oil is 10 mass ppm. The content of the following desulfurized gas oil was set to 10% by volume or more.

When the content of the fuel base oil contained in the fuel oil composition is less than 75% by volume, the content of unsaturated hydrocarbons increases, and there is a concern that the fuel filter may be clogged due to sludge generation or the like.
Further, when the content exceeds 99% by volume, problems such as precipitation of wax content of fuel oil base oil and deterioration of fluidity occur at low temperatures in winter or in cold regions. Therefore, in the present invention, the fuel oil composition The content of the fuel base oil contained therein was determined to be 75 to 99% by volume. The content of the fuel oil base oil is preferably 78 to 97% by volume.

The fuel oil composition of the present invention comprises at least one hydrocarbon oil selected from the group consisting of atmospheric residual oil, vacuum residual oil, desulfurized residual oil, slurry oil, and extract in addition to the fuel oil base oil. It contains the remaining charcoal conditioning material.
The atmospheric residual oil used as the residual coal modifier is a residual oil obtained by distilling crude oil at atmospheric pressure with an atmospheric distillation apparatus, and the vacuum residual oil is an atmospheric residue with a vacuum distillation apparatus. It is a residual oil obtained by distilling oil under reduced pressure, and a desulfurization residual oil is a residual oil obtained by desulfurizing a normal-pressure residual oil or a vacuum residual oil with a direct desulfurization apparatus.
Slurry oil is a residual oil having a boiling point of 350 ° C. or higher obtained from a fluid catalytic cracking device, and extract is a fraction obtained from a vacuum distillation device for producing a lubricating oil raw material by a solvent extraction method. Among the separated components, it refers to an aromatic component that is not suitable for lubricating oil. These hydrocarbon oils used as the residual coal modifier may be added singly or in combination of two or more.

The fuel oil composition of the present invention comprises a residual carbon modifier comprising at least one hydrocarbon oil selected from atmospheric residual oil, vacuum residual oil, desulfurized residual oil, slurry oil, and extract. 1.0 volume%, Preferably it contains 0.1-0.7 volume%, More preferably, it contains 0.2-0.7 volume%. If the blending amount of the residual coal adjuster is 0.1 to 1.0% by volume, generation of sludge can be suppressed and blockage of the fuel filter can be avoided.
In the fuel oil composition of the present invention, when the 10% residual carbon content of the fuel oil composition is less than 0.2% by mass, the duty-free condition for heavy fuel oil A “residual carbon content of 10% residual oil is 0.2% by mass or more” is satisfied. In addition, when the 10% residual carbon content exceeds 1.0%, it becomes difficult to suppress the generation of sludge. Therefore, in the present invention, the 10% residual carbon content in the fuel oil composition is reduced to 0. It was determined to be 2 to 1.0% by mass. The 10% residual carbon content is preferably 0.2 to 0.9 mass%, more preferably 0.2 to 0.6 mass%.
The value of 10% residual carbon content means a value measured according to JIS K 2270 “Crude oil and petroleum products—residual carbon content test method”.

  Based on this fuel oil composition, the content of unsaturated hydrocarbons having 15 to 40 carbon atoms having side chains added to improve the low temperature fluidity of the fuel oil composition in the present invention is 0. If it is less than 8% by volume, the desired low temperature fluidity improvement effect cannot be obtained in low temperature fluidity, and if its content exceeds 25% by volume, the residual carbon content increases by 10% and sludge generation is suppressed. It becomes difficult to do. Therefore, in the present invention, the content of the unsaturated hydrocarbon contained in the fuel oil composition is set to 0.8 to 25% by volume. The content of unsaturated hydrocarbons having 15 to 40 carbon atoms having side chains is preferably 3 to 22% by volume.

The unsaturated hydrocarbon has 15 to 40 carbon atoms, preferably 20 to 40 carbon atoms, and more preferably 25 to 35 carbon atoms.
The skeleton structure of the unsaturated hydrocarbon is a chain structure or a cyclic structure, preferably a chain structure.

The side chain of the unsaturated hydrocarbon is preferably a hydrocarbon group having 1 to 3 carbon atoms, and the hydrocarbon group preferably has 1 or 2 carbon atoms, more preferably 1 carbon atom. The number of side chains is preferably 1 to 12, more preferably 2 to 10, and still more preferably 4 to 8.
The number of unsaturated bonds in the skeleton structure of the unsaturated hydrocarbon is preferably 1 to 12,
More preferably, it is 2-10 pieces, More preferably, it is 4-8 pieces.
If the structure of the unsaturated hydrocarbon compound is within the above range, the low temperature fluidity can be improved.
As the unsaturated hydrocarbon, one type of unsaturated hydrocarbon that satisfies the above range may be added alone, or two or more types may be added in combination.

Examples of the unsaturated hydrocarbon compound include olefins, terpenes, and derivatives thereof. Among them, as olefins, 2,6,10,13,17,21-hexamethyl-10-vinyldocosa-2,6,11,16,20-hexaene, 2,3,6,10,13,17,21 -Heptamethyl-10-vinyldocosa-1,6,11,16,20-hexaene, 2,3,6,10,13,17,20,21-octamethyl-10-vinyldocosa-1,6,11,16,21 -Hexaene etc. are mentioned, and examples of terpenes include sesquiterpenes, diterpenes, sesterterpenes, triterpenes, tetraterpenes, preferably triterpenes, more preferably squalene.
A natural product may be used as long as it contains the unsaturated hydrocarbon compound. For example, a shark liver oil containing squalene or an oil containing the unsaturated hydrocarbon compound obtained from microalgae such as Botryococcus or Aurantiochytrium may be used.

The pour point of the fuel oil composition of the present invention is −20 ° C. or lower, preferably −22.5 ° C. or lower.
A pour point of −20 ° C. or lower is preferable because the possibility of a problem of low-temperature operability of a diesel vehicle due to solidification of fuel at low temperatures is reduced.
This pour point means a pour point measured according to JIS K 2269 “Pour point of crude oil and petroleum products and cloud point test method of petroleum products”.

The fluidity improver added to the fuel oil composition of the present invention is not particularly limited, and various fluidity improvers including commercially available ones can be used. A polymer type typified by a saturated ester copolymer, for example, an ethylene-vinyl acetate copolymer, or an oil-soluble dispersant type typified by a long-chain dicarboxylic amide is preferred.
If the addition amount of the fluidity improver is 1.0 ppm by volume or more based on the fuel oil composition, the effect of improving the low temperature fluidity by the unsaturated hydrocarbon becomes more prominent, and the addition amount is the fuel oil. Even if it exceeds 1000 ppm by volume based on the composition, the improvement effect of the low temperature fluidity by the combined use of the fluidity improver does not bring about an improvement that can be commensurate with the increase in the amount added, so that the fluidity is improved. The added amount of the agent is preferably 1.0 ppm by volume to 1000 ppm by volume.

The density at 15 ° C. of the fuel oil composition of the present invention is generally 0.83 to 0.89 g / cm ³ , preferably 0.85 to 0.87 g / cm ³ .
The density at 15 ° C. means a density measured according to JIS K 2249 “Crude oil and petroleum products—Density test method”.

The flash point of the fuel oil composition of the present invention is generally 60 ° C. or higher, preferably 62 ° C. or higher, from the viewpoint of safety.
This flash point means a flash point measured according to JIS K 2265 “Crude oil and petroleum products—Flash point test method”.

Kinematic viscosity at 50 ° C. of the fuel oil composition of the present invention is preferably from 1.7~5.0mm ² / s, more preferably 2.0~3.5mm ² / s. If it is this range, a fuel can be supplied from a tank to a combustion apparatus without a problem in winter, and favorable spraying and vaporization can be performed in burner combustion.
The kinematic viscosity at 50 ° C. means a kinematic viscosity measured according to JIS K 2283 “Crude oil and petroleum products—Kinematic viscosity test method”.

In the fuel oil composition of the present invention, the sulfur content is 2.0% by mass or less, preferably 0.5% by mass or less, more preferably 0.1% by mass or less. When the sulfur content is 2.0% by mass or less, the amount of SOx discharged when burned in an industrial furnace or a boiler can be reduced and flue corrosion can be suppressed.
The content of sulfur is preferably as small as possible, but is usually 0.01% by mass.
The sulfur content means a value measured according to JIS K 2541 “Crude oil and petroleum products—Sulfur content test method”.

The cetane index of the fuel oil composition of the present invention is generally 40 to 70, preferably 40 to 60. If it is this range, it will become a fuel oil composition which has favorable ignitability.
The cetane index means a value calculated according to JIS K 2204.

The cloud point of the fuel oil composition of the present invention is generally 5 ° C or lower, preferably 3 ° C or lower.
In the fuel oil composition of the present invention, when the cloud point is 5 ° C. or less, wax precipitation in the tank can be suppressed, the filter and piping can be blocked, and fuel can be supplied without any problem.
This cloud point means a temperature measured according to JIS K 2269 “Petroleum products—Cloud point test method”.

The clogging point (CFPP) of the fuel oil composition of the present invention is generally 0 ° C. or lower, preferably −3 ° C. or lower, more preferably −10 ° C. or lower.
Since the fuel oil composition of the present invention has a low clogging point of 0 ° C. or lower as described above, it is possible to prevent clogging of a filter in a filtering device for removing impurities in winter or in a cold region.
This clogging point means a clogging point measured according to JIS K 2288 “Light oil—clogging point test method”.

In general, the total calorific value of the fuel oil composition of the present invention is preferably 42 to 46 MJ / kg, and more preferably 44 to 46 MJ / kg.
In the fuel oil composition of the present invention, efficient combustion is possible when the total calorific value is in the above range. This total calorific value means the total calorific value measured according to JIS K 2279 “Crude oil and petroleum product gas oil—heat calorific value test method and calculation estimation method”.

The 10 vol% distillation temperature (T10) of the fuel oil composition of the present invention is generally 170 to 260 ° C, preferably 180 to 260 ° C, more preferably 190 to 260 ° C.
170 ° C. or higher is preferable from the influence on safety due to the reduction of the flash point, and 260 ° C. or lower is preferable from the viewpoint of low temperature performance.
The 50 vol% distillation temperature (T50) is generally 230-320 ° C, preferably 240-310 ° C, more preferably 250-310 ° C.
When the temperature is less than 230 ° C., the calorific value tends to be deteriorated.
And 90 volume% distillation temperature (T90) is 280-380 degreeC generally, Preferably it is 290-380 degreeC, More preferably, it is 300-380 degreeC.
It is preferable that it is 280 degreeC or more from the point of the emitted-heat amount. On the other hand, when it exceeds 380 ° C., vaporization is difficult to proceed, and it tends to be difficult to burn completely, and the wax content is too high, and the effect of additives such as a low-temperature fluidity improver is hardly exhibited.
In addition, 10 volume% distillation temperature (T10), 50 volume% distillation temperature (T50), and 90 volume% distillation temperature (T90) are measured according to JISK2254 "petroleum product light oil-distillation test method". It means the distillation temperature.

  The saturated oil content of the fuel oil composition is 40.0 to 56.0% by volume, preferably 45.0 to 55.0% by volume. The naphthene content of the fuel oil composition is 20.0 to 27.0 vol%, preferably 22.0 to 27.0 vol%. When the content ratio of the saturated component and the naphthene component falls within this range, the effect of diluting the n-paraffin, which is the main component of the wax affecting the low-temperature fluidity, is preferably increased.

In addition, the saturated content rate here is calculated | required based on JPI-5S-49-2007 "Petroleum product-hydrocarbon type test method-high performance liquid chromatograph method".
The naphthene content is determined by gas chromatography-mass spectrometry (GC-MS) after the fuel oil composition is fractionated into aromatics and saturated components by high performance liquid chromatography (HPLC). In accordance with ASTM D 2786, the ratio of naphthenes is calculated, and the ratio obtained here is determined according to JPI-5S-49-2007 “Petroleum products—Hydrocarbon type test method—High performance liquid chromatograph method”. It is obtained by multiplying the saturation ratio obtained by the above.

When producing the fuel oil composition of the present invention, the residual coal modifier and the unsaturated hydrocarbon may be added to the fuel base oil in any order. The method for adding each component of the fuel oil composition of the present invention is not particularly limited, and the unsaturated hydrocarbon compound may be added after the residual coal modifier is first added to the fuel oil base oil. The residual coal modifier may be added after the unsaturated hydrocarbon compound is first added to the fuel oil base oil, and the residual coal modifier and the unsaturated hydrocarbon compound are mixed in advance and then added to the fuel oil base oil. May be. Moreover, you may add a residual coal modifier and an unsaturated hydrocarbon compound as a solution of a suitable solvent. In addition, the fuel oil composition of the present invention is usually added to petroleum distillate fuel oil, such as rust inhibitor, antioxidant, anticorrosive agent, antistatic agent, cetane number improver, metal deactivator, etc. An agent may be added.
Moreover, the fluidity improver added to this petroleum fraction fuel oil is added after the addition of each of the above components or during the addition of each component.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, these examples show typical examples when the present invention is implemented, and the present invention is not limited to these examples. is not.

  Characteristics relating to each of desulfurized light oil, straight-run gas oil, intermediate degasified oil, LCO, desulfurized light vacuum gas oil, and light vacuum gas oil employed as constituents of the fuel base oil used in the following Examples and Comparative Examples, namely 15 The density at ℃, the flash point, the kinematic viscosity at 50 ° C, the pour point, the sulfur content, the residual carbon content, the cetane index, the cloud point, the clogging point, the total calorific value and the distillation properties are JIS K 2249 and JIS K 2265, respectively. , JIS K 2283, JIS K 2269, JIS K 2541, JIS K 2270, JIS K 2204, JIS K 2269, JIS K 2288, JIS K 2279 and JIS K 2254 Are shown in Table 1.

The saturated content ratio was measured in accordance with the method defined in JPI-5S-49-2007. The apparatus configuration and analysis conditions of HPLC are shown below.
Apparatus: Agilent 1100 Series (ALS: G1329A, Bin
Pump: G1312A, Degasser: G1379A, Rid: G1362A, C
olcom: G1316A)
Mobile phase: n-hexane Flow rate: 1.0 ml / min
Column: Silver nitrate impregnated silica column (4.6 ml. D. * 70 mm L. AgNO3-1071-Y manufactured by Senshu Kagaku)
Amine modified column (4.0 ml.D. * 250 mm L. 2)
LICHROSORB-NH2)
Column temperature: 35 ° C
Sample concentration: 10 vol%
Injection volume: 5 μl

The naphthene content was measured by the following method.
First, a sample was fractionated by a saturated component and an aromatic component by HPLC, and then a type analysis was performed on the saturated component by GC-MS. Based on the analysis result obtained here, the analysis was performed according to ASTM D2786, and the content ratio of the paraffin content in the saturated content and the naphthene content was determined. The ratio of naphthene content was determined by multiplying the ratio of naphthene content in the saturated content obtained here by the saturation content ratio determined as described above.

The analysis conditions of GC-MS are shown below.
Apparatus: HP-6890 HP5975 quadrupole mass spectrometer Column: DB-1: 30 m × 0.25 mm I.D. D. × 0.25μm
Oven temperature: 40 ° C. (1 min) → 10 ° C./min→280° C. (5 min)
Inlet temperature: 43 ° C. Even track mode ON
Interface temperature: 300 ° C
Carrier gas: He: 55 KPa Constant flow mode ON
Solvent Delay: 5.3min
Mass range: 50-500 Threshold = 100 Sampling # 3
Ionization voltage: 70 eV
Injection method: On-column injection 1.0 μl

  Table 2 shows the results of measurement of the density, sulfur content and residual carbon content at 15 ° C. of the vacuum residue oil and extract.

実施例および比較例で用いた不飽和炭化水素は次の通りであった。
スクアレン：Ｃ_３０Ｈ_５０、融点-７５℃
スクアラン：Ｃ_３０Ｈ_６２、融点-３８℃
ミルセン：Ｃ_１０Ｈ_１６、融点５０℃
(R)-(+)-リモネン：Ｃ_１０Ｈ_１６、融点-９６．６℃

The unsaturated hydrocarbons used in the examples and comparative examples were as follows.
Squalene: C ₃₀ H ₅₀ , melting point -75 ° C
Squalane: C ₃₀ H ₆₂ , melting point -38 ° C.
Myrcene: C ₁₀ H ₁₆ , melting point 50 ° C.
(R)-(+)-Limonene: C ₁₀ H ₁₆ , melting point −96.6 ° C.

Hereinafter, Examples 1 to 4 and Comparative Examples 1 to 5 described in Table 3 will be described.
Example 1
3. Sulfur-free desulfurized gas oil 23.7% by volume (ratio of the desulfurized gas oil in the fuel oil base oil: 25% by volume), straight-run gas oil, each having the properties shown in Table 1, based on the fuel oil base oil. 8% by volume, 17.1% by volume of degassed oil, 21.8% by volume of LCO, 27.3% by volume of desulfurized light vacuum oil, 0.3% of vacuum residual oil having the properties shown in Table 2 as a residual coal modifier. % And squalene 5.0% by volume, and then adding a commercially available ethylene-vinyl acetate copolymer based fluidity improver so that the content based on the fuel oil composition is 200 ppm by volume. A fuel oil composition was prepared by adding to and mixing with the mixture.
* When the claim contains a fluidity improver.

Example 2
22.5% by volume of the desulfurized gas oil (ratio of the desulfurized gas oil in the fuel oil base oil: 25% by volume), 4.5% by volume of straight run gas oil, 16.2% by volume of degassed light oil, and 20% of LCO A fuel oil composition was prepared in the same manner as in Example 1, except that 0.7% by volume, 25.8% by volume of desulfurized light vacuum gas oil, and 10.0% by volume of squalene were used.

Example 3
20.0% by volume of the desulfurized gas oil (ratio of the desulfurized gas oil in the fuel oil base oil: 25% by volume), 4.0% by volume of straight run gas oil, 14.4% by volume of degassed light oil, 18% of LCO A fuel oil composition was prepared in the same manner as in Example 1 except that 4% by volume, 22.9% by volume of desulfurized light vacuum gas oil, and 20.0% by volume of squalene were used.

Example 4
24.0% by volume of the desulfurized gas oil (ratio of the desulfurized gas oil in the fuel base oil: 25% by volume), 21.9% by volume of straight-run gas oil, 22.8% by volume of LCO, 25 of light vacuum gas oil .7% by volume, after mixing 0.6% by volume of the extract shown in Table 2 as a residual coal modifier and 5.0% by volume of squalene, the flowability improver was 500 ppm by volume based on the fuel oil composition. It added and mixed so that it might become.

Comparative Example 1
25.0% by volume of the desulfurized gas oil (ratio of the desulfurized gas oil in the fuel base oil: 25% by volume), 5.0% by volume of straight run gas oil, 18.0% by volume of degassed light oil, and 23% of LCO 0.0 vol%, 28.7 vol% desulfurized light vacuum gas oil, and 0.3 vol% vacuum residue oil whose properties are shown in Table 2 as a residual coal modifier are mixed, and then a fluidity improver is added to the fuel oil composition. It added and mixed so that it might become 200 volume ppm on the basis.

Comparative Example 2
17.5% by volume of the desulfurized gas oil (ratio of the desulfurized gas oil in the fuel base oil: 25% by volume), 3.5% by volume of straight run gas oil, 12.6% by volume of degassed light oil, and 16% of LCO A fuel oil composition was prepared in the same manner as in Example 1 except that 1% by volume, 20.0% by volume of desulfurized light vacuum gas oil, and 30.0% by volume of squalene were used.

Comparative Example 3
A fuel oil composition was prepared in the same manner as in Example 1 except that 5.0% by volume of squalane was used instead of squalene.

Comparative Example 4
A fuel oil composition was prepared in the same manner as in Example 1 except that 5.0% by volume of myrcene was used instead of squalene.

Comparative Example 5
A fuel oil composition was prepared in the same manner as in Example 1, except that 5.0% by volume of (R)-(+)-limonene was used instead of squalene.

  From Table 4, the fuel oil composition of the present invention obtained in Examples 1 to 4 contains 75 to 99% by volume of a fuel oil base oil containing 10 to 70% by volume of desulfurized light oil having a sulfur content of 10 mass ppm or less. 0.1 to 1.0% by volume of a residual carbon modifier comprising at least one hydrocarbon oil selected from normal pressure residual oil, reduced pressure residual oil, desulfurized residual oil, slurry oil and extract, and side chain A fuel oil composition comprising 0.8 to 25% by volume of an unsaturated hydrocarbon compound having 15 to 40 carbon atoms and a fluidity improver, the content of the fluidity improver Is a fuel oil composition containing 1.0 to 1000 ppm by volume on the basis of the fuel oil composition, so that the cetane index is compared with Comparative Example 1 not containing the unsaturated hydrocarbon compound. It can be seen that the low temperature fluidity is excellent without lowering.

From Table 4, when the fuel oil compositions obtained in Comparative Examples 2 to 5 exceed the upper limit of the unsaturated hydrocarbon content having 15 to 40 carbon atoms (Comparative Example 2), the low temperature fluidity is Although improved, 10% residual carbon is outside the scope of the present invention.
Moreover, when hydrocarbons different from the structure of unsaturated hydrocarbons having 15 to 40 carbon atoms are used (Comparative Examples 3 to 5), it can be seen that the low temperature fluidity cannot be improved.

Claims (3)

  A fuel oil composition having a 10% residual carbon content of 0.2 to 1.0% by mass, comprising 10 to 70% by volume of desulfurized gas oil having a sulfur content of 10 mass ppm or less based on the fuel oil base oil. Residue adjusting agent 0.1 to 75% by volume of base oil and at least one hydrocarbon oil selected from the group consisting of atmospheric residual oil, vacuum residual oil, desulfurized residual oil, slurry oil and extract 1.0% by volume, 0.8 to 25% by volume of unsaturated hydrocarbons having 15 to 40 carbon atoms having side chains, and 1.0 to 1000 ppm by volume of fluidity improver, respectively. The fuel oil composition described above, which is contained based on the composition.   The fuel oil composition according to claim 1, wherein the unsaturated hydrocarbon has 1 to 12 unsaturated bonds in the skeleton structure.   The fuel oil composition according to claim 1 or 2, wherein the unsaturated hydrocarbon has 1 to 12 side chains having 1 to 3 carbon atoms.