WO1999066010A1

WO1999066010A1 - Fuel oil additive and fuel oil composition

Info

Publication number: WO1999066010A1
Application number: PCT/JP1999/003183
Authority: WO
Inventors: Jitsuo Shinoda
Original assignee: Idemitsu Kosan Co., Ltd.
Priority date: 1998-06-15
Filing date: 1999-06-15
Publication date: 1999-12-23
Also published as: KR20010042033A; EP1116779A1; CN1305520A; EP1116779A4

Abstract

A fuel oil additive which comprises (a) an alkenylsuccinimide compound, an alkylsuccinimide compound, or a boron adduct of either and (b) a lubricant and has a 90 % running point of 320 °C or higher, and which may further contain (c) a low-temperature flowability improver; and a fuel oil composition comprising a fuel oil and the additive added thereto. When added especially to a light oil reduced in sulfur content, the additive has excellent performances in lubricating a fuel injection pump and in cleansing fuel injection nozzles.

Description

Specification

Fuel oil additive and fuel oil composition

Technical field

The present invention relates to a fuel oil additive and a fuel oil composition, and more particularly, to a fuel additive to be added to a diesel engine oil used particularly for automobiles, ships, generators, and the like, and a fuel additive. It relates to the included fuel oil composition.

Background art

In recent years, it has been required to reduce the sulfur content of diesel engine light oil in order to comply with exhaust gas regulations, and the content has been increased to 0.05 weight since October 1997. Regulated below / ₀ . However, it has been known that when deep desulfurization is performed on a gas oil base for such low sulfur, the lubricating performance of the obtained gas oil product is reduced. Immediately due to such a decrease in lubrication performance, the wear of each part of the fuel injection pump of a diesel engine lubricated with light oil as fuel increases, resulting in poor engine rotation and poor operability. Inconvenience has been reported. This decrease in the lubricity of light oil is due to the removal of polar compounds such as nitrogen and aromatics that have provided lubricity along with sulfur during hydrodesulfurization to remove sulfur from light oil. it is conceivable that. To cope with such a decrease in the lubricating performance of light oil, measures have been taken from the hard side, but on the other hand, measures have to be taken from the fuel side. Have been developed and added.

Also, by reducing the sulfur content of diesel fuel, the amount of sulfuric acid putate in exhaust gas from diesel vehicles can be reduced. However, particulate emissions have been reported to increase due to reduced cleanliness of the fuel injection nozzles. Therefore, various detergents are also studied and added. Generally, the above-mentioned lubricity improver can improve the lubricity of the fuel injection pump, but does not contribute to the cleanliness of the fuel injection nozzle. On the other hand, the above-mentioned detergent can contribute to the cleaning of the fuel injection nozzle, but hardly contributes to the improvement of the lubricity of the fuel injection pump. For example,

Japanese Patent Application Laid-Open No. 9-272880 discloses a low sulfur gas oil to which a fatty acid ester of sorbitan is added, but does not contribute to the cleanliness of the fuel injection nozzle. — Japanese Patent No. 2555593 discloses a low-sulfur light oil to which a salt of a carboxylic acid and an aliphatic amine has been added, and the lubricity of the fuel injection pump and the cleanliness of the fuel injection nozzle are disclosed. It has contributed to both, but its effect is not sufficient. In addition, Tokuhyohei 1 0 — 5 1 3 2 0 8 (Exon Chemical, W096 / 23855; released on August 8, 1996) is A fuel oil containing no more than 50% by weight of sulfur and having a 95% distillation point of 350 ° C. or lower, (a) an acylated nitrogen compound, and (b) a carboxylic acid having 2 to 50 carbon atoms, or A fuel oil composition comprising an additive composition containing an ester of a carboxylic acid and an alcohol is disclosed. The additive composition comprising (a) and (b) improves the lubricity of the fuel oil and improves the lubricity of the fuel oil. It discloses improving solubility in fuel oil. Thus, there has been a demand for an additive having excellent performance for improving the lubricity of the fuel injection pump and the cleanliness of the fuel injection nozzle. It is important to improve the lubricating properties of the fuel injection bomb and the cleanliness of the fuel injection nozzles, especially for light oils that have not progressed to low sulfuration.

The present invention has been made in view of the above, and particularly has a reduced sulfur content.

For fuel oil with a 90% point distilling temperature of 320 ° C or higher, an additive for fuel gauging that has excellent performance in improving the lubricity of the fuel injection pump and the cleanliness of the fuel injection nozzle. It is an object of the present invention to provide a fuel oil composition containing the same. Disclosure of the invention

As a result of intensive studies, the present inventor has found that the use of an alkenyl succinic acid imid compound or an alkyl succinic acid imid compound or a boron adduct thereof as a component of the additive provides The inventors have found that the object of the present invention can be effectively achieved and completed the present invention.

That is, the gist of the present invention is as follows.

(1) Distillation at 90% point comprising (a) alkenyl succinic acid imid compound or alkyl succinic acid imid compound or a boron adduct thereof, and (b) lubricity improver Fuel oil additive with a temperature of more than 320 ° C.

(2) (a) an alkenyl succinic acid imid compound or an alkyl succinic acid imid compound or a boron adduct thereof, (b) a lubricity improver, and (c) a low temperature fluidity improver A fuel oil additive with a distillation temperature at the 90% point of 32 ° C or higher.

(3) The fuel oil additive according to (1) or (2), wherein the lubricity improver is at least one kind of unsaturated fatty acid having 4 to 22 carbon atoms, a dimer acid thereof, or an ester thereof.

(4) A fuel oil composition obtained by adding the fuel oil additive according to any one of (1) to (3) to a fuel oil.

(5) (a) amount of component, in fuel oil based on the total amount of the composition, 2 0-1, 5 0 0 wt ^ 1 Dearu (4) fuel composition _c according

(6) The fuel oil composition according to (4) or (5), wherein the amount of the component (b) added is 5 to 300 weight parts per million based on the total amount of the fuel oil composition.

(7) The fuel oil composition according to any one of (4) to (6), wherein the amount of the component (c) added is 50 to 500 weight parts per million based on the total amount of the fuel oil composition.

(8) The fuel oil is a diesel light oil according to any of (4) to (7). The fuel oil composition of claim

(9) The fuel oil composition according to (8), wherein the sulfur content of the diesel fuel oil is from 0.001 to 0.05% by weight.

(10) The fuel oil composition according to (4), wherein the distillation temperature at the 90% point of the fuel oil is at least 320 ° C.

(11) The fuel oil composition according to (4), wherein the distillation temperature at the 90% point of the fuel is not less than 330 ° C.

(12) The fuel oil composition according to (4), wherein the distillation temperature at the 90% point of the fuel oil is at least 34 ° C.

(13) The fuel oil composition according to (4), wherein the distillation temperature at the 90% point of the fuel is 350 ° C or more.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

First, the alkenyl succinic acid imid compound or the alkyl succinic acid imid compound, which is the component (a) constituting the fuel oil additive of the first invention of the present application, or a boron adduct thereof will be described. I do. Examples of the alkenyl succinic imide compound and the alkyl succinic imide compound include a mono-form of the following general formula (1) and a bis-form of the general formula (2).

R ¹ -CH

R ² NH ^ ~ H (1)

m

CH 2 0

CH "C CH- R

5 6 /

R ° NH R-I

-c n

CH ヽ G-

-CH 2

0

(2)

(Wherein, R ¹ R ³ and R ⁴ may be the same or different in an alkenyl group or an alkyl group having a number average molecular weight of 300 to 4,000, and R ⁵ and R ⁶ have 2 to 4 carbon atoms. May be the same or different, and m represents an integer of from 1 to 10, and n represents 0 or an integer of from 1 to 10.) In the above general formulas (1) and (2), , R ¹ R ³ and R ⁴ preferably have a number average molecular weight of 500 to 2,000, more preferably 500 to

The alkenyl group is a 1,000 alkenyl group or an alkyl group, and examples of the alkenyl group include a polybutyl group and an ethylene-propylene copolymer, and examples of the alkyl group are hydrogenated ones.

In the present invention, any of the above-mentioned mono- and bis-forms can be used.

The alkenyl succinic imide compound and the alkyl succinic imide compound described above are usually polyalkenyl succinic anhydrides obtained by the reaction of polyolefin and maleic anhydride, or polyalkyl succinic anhydrides obtained by hydrogenating them. It can be prepared by reacting succinic anhydride with a polyamine. The above-mentioned mono- and bis-forms can be prepared by changing the reaction ratio between polyalkenyl succinic anhydride or polyalkyl succinic imide and polyamine. As the olefin monomer for forming the polyolefin, one or two or more kinds of olefins having 2 to 8 carbon atoms can be used. Meanwhile, poly Examples of the amine include ethylenediamine, propylenediamine, butylenediamine, benchdiamine, and other single diamines, diethylenetriamine, triethylenetetramine, Polyalkylene polyamido, such as tetraethylenepentamine, pentaethylenehexamine, di (methylethylene) triamine, dibutylenetriamine, tributylenetriamine, pentapentylenehexamine, etc. Can be mentioned.

As the boron adduct of the alkenyl succinic imide compound or the alkyl succinic imide compound, those prepared by a conventional method can be used. The preferred content of boron in the boron adduct is in the range of 0.1 :! to 6% by weight, more preferably 0.1 to 4% by weight. / ₀ range.

The above component (a) can be used alone or in combination of two or more.

Next, the lubricity improver of the component (b) constituting the first invention of the present application will be described. The lubricity improver used in the present invention refers to an additive compounded for the purpose of lowering the coefficient of friction, and is not particularly limited, but may be an unsaturated fatty acid having 4 to 22 carbon atoms or a dimer acid or an ester thereof. A mixture of the above-mentioned acid and its esterified compound is preferably used. The unsaturated fatty acids may be linear or branched, and include, for example, caboleic acid, Linderic acid, zzudic acid, myristoleic acid, oleic acid, kodonic acid, L-force. Acids, linoleic acid, linolenic acid and the like can be mentioned. Examples of the alcohol used for the esterification include methyl alcohol, ethyl alcohol, oleyl alcohol, and glycerin. The esterified product may be a partial esterified product.

Other lubricating agents include stearic acid amide, oleic acid amide, bis (polyethylene glycol) amide and the like. Amine compounds such as amide compounds, dodecylamine, stearate dimethylamine, stearate dimethylamine, cyclohexinoleamine, dodecilebis (diethylene glycol) amine, and the like; Phenyl-α-naphthylamine, bisoctylphenylamine, bisnonylphenylamine, diphenyl ρ-phenylene-diamine, dipyridyllinoleamine, phenothiazine, Ν-methylphen Amine-based compounds other than those mentioned above, such as nothiazine and Ν-ethylphenothiazine; disulfides such as dibutyl disulfide, dioctyl disulfide, didodecyl disulfide; chlorinated paraffin wax, chlorinated naphthalene , Chlorinated hydrocarbons such as chlorinated alkylbenzenes; η-butyldiene η-octylphosphine E Sufine bets such as one bets; di - _eta - Buchinore to carboxymethyl Honoré phosphate bone over preparative, di one eta - Bed Chirufue two Norehosuhone phosphonate one bets such as one bets; Application Benefits Buchiruhosufue - DOO, Application Benefits click Rejiruhosufue over , Trioleic solephosphate, G2-phosphates such as ethynolehexinolephosphate; 2, 6-g-t-butynole Ρ-cresole, 2,2'-methylenebis (4-me Chinole — 6—t—butylphenol), 2,2′-methylenebis (4—ethyl-6-t—butylphenol), 2,5—di-t—amylohydroquinone, 2,5—dione t-butyl hydroquinone, 4,4'-thiobis (6—t—butyl-m—cresole), octadecyl-3— (3,5—di—t—butynole-4—hydroxypheno) Onet, 3, 5-di-t-butynole 4-hydroxy-benzinolephosphonate-ethylenol ester, triethyleneglycol-bis [3- (3-t-butynole-5-methynole--5- Phenols such as (hydroxyphenyl) propionate).

The above component (b) can be used alone or in combination of two or more. The ratio of the components (a) and (b) is preferably 90:10 to 10:90 by weight, and the fuel oil additive of the first invention is kerosene oil and / or Dilute with a diluent such as an aromatic solvent having about 8 to 10 carbon atoms, and furthermore, if necessary, use an antioxidant, a gold inactivation agent, a microbial disinfectant, an antifreezing agent, an antistatic agent, a corrosion inhibitor, The total amount of the component (a) and the component (b) is preferably 20 to 80% by adding an additive such as a foaming agent, a fireproofing agent, a flame retardant, a colorant, and a pigment. / ₀ .

The fuel oil additive according to the first aspect of the present invention further improves lubricity of the fuel oil by adding a low-temperature fluidity improver as the component (c) in addition to the components (a) and (b). can do. The low-temperature fluidity improver of the component (c) is not particularly limited, but may be an ester of a nitrogen-containing compound having a hydroxyl group with a linear saturated fatty acid (Japanese Patent Laid-Open No. 57-179933). JP-A-58-13879), a polymer of the ester and one or two or more monomers selected from ethylene, ethylenically unsaturated alkyl carboxylate and saturated fatty acid vinyl. No. 1) is preferably used. In addition, examples of the low-temperature fluidity improver include ethylene-butyl acetate copolymer, ethylene monoalkyl anolate, polyalkyl acrylate, and anolequenyl succinic acid amide.

The component (c) can be used alone or in combination of two or more.

The proportion of the component (c) is preferably 30 to 50 parts by weight based on 100 parts by weight of the sum of the amounts of the components (a) and (b). For fuel oil additives, components (a), (b) and (c) are diluted with a diluent such as kerosene light oil or an aromatic solvent having about 8 to 10 carbon atoms, and if necessary, an antioxidant. Additives such as metal deactivators, microbial disinfectants, deicing agents, antistatic agents, corrosion inhibitors, defoamers, antioxidants, flame retardants, coloring agents, markers, etc. (a), The total amount of the components (b) and (C) is preferably 20 to 80% by weight. Prepared by setting / o.

The second invention of the present application is a fuel oil composition obtained by adding the fuel oil additive to fuel oil. Examples of the fuel oil composition include various hydrocarbon-based fuel oils, preferably gasoline or diesel gas oil from the viewpoint of required performance, and particularly preferably diesel gas oil.c. Diesel diesel oil has its characteristics satisfying the Japanese Industrial Standards (JISK224). In particular, it has a weight of 0.001 to 0.05. Those containing sulfur content of / ₀ are better. Preferably, the kinematic viscosity at 30 ° C is 1.7 mm ² / s or more. For example, hydrodesulfurized gas oil (DGO), hydrocracked gas oil (HCGO), or a mixture thereof is used. Those prepared to have a sulfur content within the above range can be used.

The diesel light oil composition of the present invention preferably contains sulfur (0.01) to 0.05% by weight. If the sulfur content deviates from this range, the above-mentioned fuel oil composition may be used. The effect of the additives may be reduced. As for the distillation properties, the distillation temperature at the 90% point is preferably 320 ° C or more, more preferably 330 ° C or more, more preferably 340 ° C or more, and most preferably. The temperature is above 350 ° C, and below 320 ° C, the effect of the fuel oil additive decreases.

The hydrodesulfurized gas oil (DGO) generally has a boiling point in the range of 140 to 390, and a density of 0.80 to 0.90 can be appropriately used. As the hydrodesulfurized light oil (DGO), those having a sulfur content of 0.05 to 0.5% by weight can be generally used, but those having a sulfur content of 0.05% by weight or less are preferably used. it can.

In addition, the above hydrodesulfurized gas oil (DG〇) is specifically used as a feedstock oil. Using hydrodesulfurization device straight run gas oil (LGO) of, Ji ₀ - \ _{0 /} / Arumi Na catalyst, N i - M o / in the presence of a catalyst of alumina catalyst or the like, 3 0-1 0

Under a pressure of 0 kg / cm ² G, preferably 50-70 kg / cm ² G, at 300-400 ° C., preferably 330-360. In C temperature, liquid hourly space velocity (LHSV) 0. 5~ 5 hr - E, favored properly performs desulfurization reaction under the conditions of l ~ 2 hr one ^1, dividing the hydrogen sulfide and naphtha thereafter be sampled Li wrapper It is obtained by leaving.

The above-mentioned hydrocracked gas oil (HCGO) refers to heavy gas oil (HG O), vacuum gas oil (VGO) or a mixture of these in the presence of a catalyst, and the cracked oil is distilled and separated. The hydrogenolysis gas oil (HCGO) has a sulfur content of 0.0001 to 0.2% by weight. / ₀ is generally available.

In addition, in addition to the gas oil base material described above, gas oil fractions generally used as necessary, such as straight-run gas oil (LGO), by-product light oil from heavy oil direct desulfurization equipment

(DSGO), by-product gas oil from catalytic cracking unit (LCO), desulfurized LCO (DSLCO), by-product gas oil from indirect desulfurization unit (VHLGO), desulfurized gas oil (DWL GO), desulfurized gas oil ( DWDG O), desulfurized kerosene fraction (DK), etc. can be mixed and used.

The additive amount of the fuel oil additive may be such that the components (a), (b) and (c) have the following amounts.

The component (a) is preferably 20 to 1,500 weight 111, more preferably 50 to 800 weight ppm, based on the total amount of the composition. When the weight is less than 20 ppm by weight, the cleanliness of the nozzle is hardly improved. When the weight exceeds 1,500 weight ppm, the cleanliness of the nozzle may not be improved effectively.

The component (b) is preferably 5 to 3 based on the total amount of the composition. 100 ppm by weight, more preferably 10 to 150 ppm by weight When the amount is less than ppm, the lubricity of the pump is hardly improved.When the amount exceeds 30 ppm by weight, the lubricity of the pump is reduced. Sometimes it does not improve effectively.

The component (c) is preferably from 50 to 500 ppm by weight, more preferably from 0 () to 400 ppm by weight, and less than 50 ppm by weight, based on the total amount of the composition. It is difficult to improve the lubricity of the pump due to the synergistic effect with the component (b). If the content exceeds 300 ppm by weight, the lubricity of the pump due to the synergistic effect with the component (b) is effectively improved. May not.

The fuel oil composition of the present invention may contain, if necessary, an antioxidant, a metal deactivator, a microbial disinfectant, an antifreezing agent, an antistatic agent, a corrosion inhibitor, a quencher as long as the effects of the present invention are not impaired. Additives such as a foaming agent, an antibacterial agent, a flame retardant, a coloring agent, and a marker can be appropriately added. These additives may be added separately from the fuel additive, but are usually added as a fuel oil additive package.

【Example】

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 3; Comparative Examples 1 and 2 and Reference Example 1

(1) Preparation of diesel gas oil composition of the present invention

(i) Test light oil

Uses deep desulfurized gas oil shown in Table 1 below Table 1

(ii) Additive

The following additives were added at the ratios shown in Table 2 to add the light oil composition.

(a) Succinic acid imid of the component

Polybuturic succinic acid imid prepared by adding polybutene having a number average molecular weight of 960 to maleic anhydride and further adding tetraethylenepentamine has a viscosity at 40 C of 32 mm ² / s. Diluted with considerable mineral oil to a concentration of 64% by weight.

(b) Component lubricity improver

Main component is a mixture of unsaturated fatty acids of 1 8 carbon atoms, the amount of re-Nord acid, mainly of Orein acid and re Roh Ichiru acid (each acid is 1 5-5 0 wt. / _0, total are those amounts to 9 0 wt. / ₀ corresponds a is mixture), is obtained by a 2 0 wt% active ingredient is diluted with an aromatic solvent having a carbon number of 1 0.

(c) Component low temperature fluidity improver

A mixture of trieta-noreamin (25% by weight), tribehenate (50% by weight) and ethylene-vinyl acetate copolymer (25% by weight). The active ingredient was diluted to 50% by weight with a group solvent.

(2) Evaluation of nozzle cleanliness

The gas oil composition prepared as described above was evaluated for nozzle cleanliness as follows.

A 2,400 cc in-chamber combustion type in-line 4-cylinder diesel engine equipped with a slot-type nozzle was installed at 2,400 rpm and a torque of 12.7 kg · m (load At 80%) for 18 hours. After the operation is completed, use an air flow measurement device to check the nozzle for contamination. When the needle valve of the scalpel is pulled up to 0.00 to 0.6 mm,

The flow rate when air at a pressure of 5 kg / cm ² was measured. The area of the air flow rate for this needle valve lift amount was calculated, the area before the test (new) and the area after the test were compared, and the degree of nozzle contamination was evaluated. The flow rate area maintenance rate by comparing the air flow area value with the needle valve lift amount before and after the test was 0]

A value of 0% indicates that it is the same as the new product before the test, and that it is not dirty at all. Conversely, if it is 0%, it means that it is completely clogged and no fuel is injected. Table 2 shows the results.

(3) Evaluation of lubrication performance

Use of HFRR (High Frequency Reciprocation Wear Rig: High Frequency Reciprocation Wear Rig) equipment according to the European Commission's CEC-F — 06-T94, load: 200 g, test oil temperature: 60 ° C, The specimen ball was worn under the conditions of a vibration frequency of 50 Hz, a test time of 75 minutes, and a sample volume of 2 m1. The amount of spread of the wear marks was measured using a microscope in the X (horizontal) and Y (longitudinal) directions, and the wear width (/ im) was determined on average. Table 2 shows the results.

Table 2

(Note) P P m

Table 2 shows that the gas oil composition to which the additive of the present invention is added has a high nozzle flow area maintenance rate and improves the cleanliness of the injection nozzle. Further, it can be seen that the wear width is small and the lubricity is improved.

Examples 4 and 5

[Effect of reducing PM in exhaust gas and effect of cleanliness]

The PM (particulate matter, also called particulate matter) emissions were compared under the engines and evaluation conditions shown in Tables 3 and 4 below. That is, after traveling 500 km under the nozzle contamination conditions shown in Table 4 using the fuels shown in Table 1 (Example 4) and Table 5 (Example 5) and the engines shown in Table 3, The nozzle was cleaned under the nozzle recovery condition of 4. Next, using the engine conditions for PM emission measurement engine shown in Table 4 and the mini-dilution tunnel system (manufactured by HORIBA, Ltd.), the method for testing particulate matter in diesel vehicles (TRIAS-2 4 — 5 — 1993) PM emission was measured with reference to. Table 6 shows the results.

Comparative Examples 3 and 4

Also, the amount of PM emission was measured in the same manner as in Examples 4 and 5, except that succinic acid imid and the low-temperature fluidity improver were not used. Table 7 shows the results.

Table 3 Main specifications of engine used

Table 4 Engine evaluation conditions

Nozzle fouling nozzle Nozzle cleanliness PM discharge amount Recovery operation condition Measurement condition Engine speed 2 0 0 0 2 6 0 0 1 5 0 0

(r p m

Engine load factor (./o) 8 0 2 5 8 0 Lubricating oil temperature (° c) 8 5 8 5 8 5 Engine cooling water temperature 8 0 8 0 8 0

(.C)

Inlet air temperature (° c) 2 5 2 5 2 5 Inlet air humidity (° c) 5 0 5 0 5 0 Fuel oil temperature (° c) 25 25 25 Operating time (hr) 5 0 0 km 8 0.5 / Test Until you run Table 5 Properties of fuel used

Table 6 PM emissions (Example)

(Note) * Weight p p m Table 7 PM emission (comparative example)

(Note) * Weight p p m Industrial applicability

According to the present invention, particularly for light oil having a reduced sulfur content, fuel injection It is possible to provide a fuel oil additive having excellent performance for improving the lubricity of a pump and the cleanliness of a fuel injection nozzle, and a fuel oil composition containing the same.

Claims

The scope of the claims

1. Distillation temperature at 90% point comprising (a) alkenyl succinic acid imid compound or alkyl succinic imid compound or boron adduct thereof, and (b) lubricity improver Additive for fuel oils with a temperature of 320 ° C or higher.

2. (a) an alkenyl succinic acid imid compound or an alkyl succinic acid imid compound or a boron adduct thereof, (b) a lubricity improver, and (c) a low-temperature fluidity improver. Fuel oil additive with a distillation temperature at the 90% point of not less than 320 ° C.

3. (b) The fuel oil according to claim 1 or 2, wherein the lubricity improver is at least one kind of unsaturated fatty acid having 4 to 22 carbon atoms or its dimer monoacid or an ester thereof. Additives.

4. A fuel oil composition comprising the fuel oil and the fuel oil additive according to any one of claims 1 to 3.

5. The fuel oil composition according to claim 4, wherein the amount of the component (a) is 20 to 1,500 weight parts per million based on the total amount of the fuel oil composition.

6. The fuel oil composition according to claim 4, wherein the amount of the component (b) is 5 to 300 weight parts per million based on the total weight of the fuel oil composition.

7. The fuel oil composition according to any one of claims 4 to 6, wherein the amount of the component (c) added is 50 to 500 weight parts per million based on the total amount of the fuel oil composition.

8. The fuel oil composition according to claim 4, wherein the fuel oil is diesel light oil.

9. The sulfur content in diesel gas oil is 0.001 to 0.05 weight. 9. The fuel oil composition according to claim 8, which is / ₀ .

10. The fuel oil composition according to claim 4, wherein a distillation temperature at a 90% point of the fuel oil is 320 ° C. or higher.

11. The fuel according to claim 4, wherein the distillation temperature at the 90% point of the fuel oil is 330 ° C or higher. Oil composition.

12. The fuel oil composition according to claim 4, wherein a distillation temperature at a 90% point of the fuel oil is not lower than 340 ° C.

13. The fuel oil composition according to claim 4, wherein a distillation temperature at a 90% point of the fuel oil is 350 ° C. or higher.