Marine fuel composition

Abstract

To provide a marine fuel composition containing methanol having sufficient ignitability for marine fuel and sufficient homogeneity not to separate in a fuel tank.SOLUTION: The marine fuel composition contains 10% by volume or more of methanol and 20% by volume or more of a fatty acid ester having an aliphatic hydrocarbon group of 8 to 24 carbon atoms.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present disclosure relates to marine fuel compositions. [Background technology]

[0002] Conventionally, fuel oil such as heavy oil has been mainly used as marine fuel.

[0003] In recent years, methanol has been attracting attention as a carbon-neutral fuel that can be synthesized from carbon dioxide and hydrogen. For example, Patent Document 1 discloses a fuel injection device for using a low ignition fuel such as methanol as a secondary fuel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-132221 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described in Patent Document 1, methanol has low ignition properties, so in order to use it as a marine fuel, it must be used in combination with easily ignitable hydrocarbon fuel oils such as heavy oil, and there is also the problem that a dedicated internal combustion engine is required to use methanol as a secondary fuel.In addition, because methanol and hydrocarbon fuel oils such as heavy oil are incompatible and separate, internal combustion engines that use methanol require multiple fuel tanks, complex piping, etc., which creates size restrictions and makes control complicated.

[0006] Therefore, an object of the present invention is to provide a marine fuel composition which contains methanol, has sufficient ignition properties as a marine fuel, and is sufficiently homogeneous so as not to separate in a fuel tank. [Means for solving the problem]

[0007] The present invention provides, for example, the following [1] to

[10] . [1] 10% by volume or more of methanol; a fatty acid ester having 20% ​​by volume or more of an aliphatic hydrocarbon group having 8 to 24 carbon atoms; 1. A marine fuel composition comprising: [2] The marine fuel composition according to [1], wherein the ratio (volume ratio) of the fatty acid ester to the methanol is 0.7 or more. [3] The marine fuel composition according to [1] or [2], wherein the total content of the methanol and the fatty acid ester is 50 volume% or more. [4] The marine fuel composition according to any one of [1] to [3], further comprising an aromatic compound. [5] The marine fuel composition according to [4], wherein the content of the aromatic compound is 3% by volume or more and 35% by volume or less. [6] The marine fuel composition according to any one of [1] to [5], further comprising an aliphatic hydrocarbon. [7] The marine fuel composition according to [6], wherein the aliphatic hydrocarbons comprise paraffins. [8] The marine fuel composition according to [6] or [7], wherein the content of the aliphatic hydrocarbons is 1.5 vol% or more and 40 vol% or less. [9] The marine fuel composition according to any one of [6] to [8], wherein the ratio (volume ratio) of the fatty acid ester to the methanol is 0.9 or more.

[10] The marine fuel composition according to any one of [6] to [9], wherein the ratio (volume ratio) of the fatty acid ester to the aliphatic hydrocarbon is 0.9 or more. Effect of the Invention

[0008] According to the present invention, there is provided a marine fuel composition which contains methanol, has sufficient ignition properties as a marine fuel, and is sufficiently homogeneous so as not to separate in a fuel tank. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Preferred embodiments of the present invention will now be described in detail.

[0010] The marine fuel composition of this embodiment contains 10% by volume or more of methanol and 20% by volume or more of a fatty acid ester having an aliphatic hydrocarbon group having 8 to 24 carbon atoms.

[0011] The marine fuel composition of this embodiment contains 10% by volume or more of methanol, and therefore can be said to be a suitable marine fuel from the viewpoints of reducing greenhouse gas emissions and eliminating the use of fossil fuels. In addition, the marine fuel composition of this embodiment uses methanol in combination with a specific fatty acid ester, which provides sufficient ignition ability as a marine fuel and also provides sufficient homogeneity that does not separate in the fuel tank.

[0012] The aliphatic hydrocarbon group contained in the fatty acid ester may be, for example, a saturated aliphatic hydrocarbon group or an unsaturated aliphatic hydrocarbon group, and may be an alkyl group, an alkenyl group, an alkadienyl group, an alkatrienyl group, or an alkynyl group, preferably an alkyl group, an alkenyl group, or an alkadienyl group, and more preferably an alkyl group or an alkenyl group.

[0013] The number of carbon atoms in the aliphatic hydrocarbon group of the fatty acid ester is 8 or more, and from the viewpoint of achieving better uniformity in a multi-component system described below, may be 10 or more, 11 or more, or 12 or more. The number of carbon atoms in the aliphatic hydrocarbon group of the fatty acid ester is 24 or less, and from the viewpoint of achieving better compatibility with methanol, may be 22 or less, 20 or less, or 18 or less.

[0014] The fatty acid ester may be, for example, a fatty acid alkyl ester. The fatty acid alkyl ester may be, for example, a fatty acid methyl ester or a fatty acid ethyl ester, and is preferably a fatty acid methyl ester.

[0015] The fatty acid ester may be, for example, a compound represented by the following formula (I): [ka] [In the formula, R 1 represents an aliphatic hydrocarbon group having 8 to 24 carbon atoms, R 2 represents an alkyl group having 1 to 4 carbon atoms.]

[0016] R 2 The alkyl group in the formula (I) is preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group.

[0017] Examples of fatty acid esters include methyl decanoate, methyl undecanoate, methyl laurate, methyl tridecanoate, methyl myristate, methyl pentadecanoate, methyl palmitate, methyl heptadecanoate, methyl stearate, methyl palmitoleate, methyl oleate, methyl linoleate, and methyl linolenate.

[0018] The fuel composition of the present embodiment may be a two-component system of methanol and a fatty acid ester, or a multi-component system of methanol, a fatty acid ester, and other components, such as aromatic compounds, aliphatic hydrocarbons, alcohols other than methanol, and ethers.

[0019] A preferred embodiment of the two-component fuel composition (first embodiment) and a preferred embodiment of the multi-component fuel composition (second embodiment and third embodiment) will be described in detail below. Note that each of the following embodiments may overlap with other embodiments.

[0020] <First aspect> The fuel composition of the first embodiment is a two-component fuel composition mainly composed of 10% by volume or more of methanol and 20% by volume or more of a fatty acid ester having an aliphatic hydrocarbon group having 8 to 24 carbon atoms.

[0021] In the first embodiment, the content of methanol is 10% by volume or more, preferably 15% by volume or more, more preferably 20% by volume or more, and may be 25% by volume or more, 30% by volume or more, 35% by volume or more, 40% by volume or more, or 45% by volume or more. Also, in the first embodiment, the content of methanol is 80% by volume or less, preferably 70% by volume or less, more preferably 65% ​​by volume or less, and even more preferably 60% by volume or less.

[0022] In the first embodiment, the content of the fatty acid ester is 20% by volume or more, preferably 30% by volume or more, more preferably 35% by volume or more, and even more preferably 40% by volume or more. In the first embodiment, the content of the fatty acid ester is 90% by volume or less, preferably 85% by volume or less, more preferably 80% by volume or less, and may be 75% by volume or less, 70% by volume or less, 65% by volume or less, 60% by volume or less, or 55% by volume or less.

[0023] In the first embodiment, the ratio (volume ratio) of the fatty acid ester to methanol may be, for example, 0.4 or more, 0.5 or more, or 0.6 or more, and from the viewpoint of obtaining higher ignition ability, it is preferably 0.7 or more, and more preferably 0.8 or more. In the first embodiment, the ratio (volume ratio) of the fatty acid ester to methanol may be, for example, 5 or less, 4 or less, or 3 or less, or 2 or less, 1.5 or less, 1.3 or less, or 1.1 or less.

[0024] In the first embodiment, the total content of methanol and fatty acid ester may be, for example, 80% by volume or more, 90% by volume or more, 95% by volume or more, 97% by volume or more, or 99% by volume or more, or may be 100% by volume.

[0025] In the first embodiment, the components other than methanol and fatty acid ester are not particularly limited, and may be, for example, aromatic compounds, aliphatic hydrocarbons, etc., or may be known fuel oils used for marine fuels, etc. (for example, residual oil (atmospheric distillation residual oil, vacuum distillation residual oil, direct desulfurized residual oil), heavy oil (direct desulfurized heavy oil, hydrocracked heavy oil, catalytic cracked heavy oil), light oil (straight run light oil, direct desulfurized light oil, hydrocracked light oil, catalytic cracked light oil, thermal cracked light oil, etc.), kerosene (straight run kerosene, hydrocracked kerosene, catalytic cracked kerosene, thermal cracked kerosene), etc.).

[0026] <Second aspect> The fuel composition of the second embodiment contains 10% by volume or more of methanol, 20% by volume or more of a fatty acid ester having an aliphatic hydrocarbon group having 8 to 24 carbon atoms, and an aromatic compound.

[0027] The fuel composition of the second aspect contains an aromatic compound, and in addition to the above-mentioned effects of having sufficient ignition ability as a marine fuel and having sufficient homogeneity so as not to separate in the fuel tank, it is also likely to produce a higher heating value.

[0028] In the second embodiment, the content of methanol is 10% by volume or more, preferably 15% by volume or more, more preferably 20% by volume or more, and may be 25% by volume or more. In the second embodiment, the content of methanol may be, for example, 75% by volume or less, preferably 70% by volume or less, more preferably 60% by volume or less, even more preferably 50% by mass or less, and even more preferably 45% by volume or less, and may be 40% by volume or less, 35% by volume or less, or 30% by volume or less.

[0029] In the second embodiment, the content of the fatty acid ester is 20% by volume or more, preferably 25% by volume or more, more preferably 30% by volume or more, and may be 35% by volume or more or 40% by volume or more. In the second embodiment, the content of the fatty acid ester may be, for example, 80% by volume or less, preferably 70% by volume or less, more preferably 65% ​​by volume or less, and even more preferably 60% by volume or less.

[0030] In the second embodiment, the content of the aromatic compound may be, for example, 1% by volume or more, and from the viewpoint of further improving the calorific value, is preferably 3% by volume or more, and more preferably 5% by volume or more. In the second embodiment, the content of the aromatic compound may be, for example, 50% by volume or less, 45% by volume or less, or 40% by volume or less, and from the viewpoint of more significantly obtaining the above-mentioned effects of having sufficient ignition ability as a marine fuel and having sufficient homogeneity not to separate in the fuel tank, is preferably 35% by volume or less, more preferably 30% by volume or less, and even more preferably 25% by volume or less.

[0031] In the second embodiment, the total content of the methanol and the fatty acid ester may be, for example, 50% by volume or more, preferably 55% by volume or more, more preferably 60% by volume or more, even more preferably 65% ​​by volume or more, and may be 70% by volume or more. In the second embodiment, the total content of the methanol and the fatty acid ester may be, for example, 95% by volume or less, 90% by volume or less, 85% by volume or less, or 80% by volume or less.

[0032] Examples of aromatic compounds include aromatic hydrocarbons having a carbon number of 6 to 18. Examples of aromatic hydrocarbons include benzene, toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, trimethylbenzene, propylbenzene, tetramethylbenzene, butylbenzene, hexylbenzene, tetralin, and methylnaphthalene.

[0033] In the second embodiment, the aromatic compound may be a part of a fuel oil. That is, the fuel composition of the second embodiment may contain methanol, a fatty acid ester, and a fuel oil containing an aromatic compound (hereinafter, also referred to as a first fuel oil).

[0034] In the second embodiment, the content of the first fuel oil may be, for example, 5% by volume or more, 10% by volume or more, 15% by volume or more, or 20% by volume or more. Also, in the second embodiment, the content of the first fuel oil may be, for example, 50% by volume or less, 45% by volume or less, 40% by volume or less, 35% by volume or less, or 30% by volume or less.

[0035] The content of aromatic compounds in the first fuel oil may be, for example, 30% by volume or more, preferably 40% by volume or more, more preferably 50% by volume or more, and is, for example, 85% by volume or less, preferably 80% by volume or less, more preferably 75% by volume or less.

[0036] The first fuel oil may further contain components other than aromatic compounds. Examples of the components other than aromatic compounds in the first fuel oil include aliphatic hydrocarbons, alcohols other than methanol, and ethers.

[0037] The first fuel oil may be a known fuel oil used for marine fuel, etc. (for example, residual oil (atmospheric distillation residual oil, vacuum distillation residual oil, direct desulfurized residual oil), heavy oil (direct desulfurized heavy oil, hydrocracked heavy oil, catalytic cracked heavy oil), light oil (straight run light oil, direct desulfurized light oil, hydrocracked light oil, catalytic cracked light oil, thermal cracked light oil, etc.), kerosene (straight run kerosene, hydrocracked kerosene, catalytic cracked kerosene, thermal cracked kerosene), etc.) from the viewpoint of easily satisfying the above-mentioned range of aromatic compound content. As the first fuel oil, catalytic cracked light oil, catalytic cracked kerosene, etc. are preferable.

[0038] The aliphatic hydrocarbons in the first fuel oil may be, for example, aliphatic hydrocarbons having 8 to 30 carbon atoms, such as paraffins having 8 to 30 carbon atoms, olefins having 8 to 30 carbon atoms, and alicyclic compounds having 8 to 30 carbon atoms.

[0039] In the second embodiment, the ratio (volume ratio) of the fatty acid ester to methanol may be, for example, 0.4 or more, 0.5 or more, or 0.6 or more, and from the viewpoint of more significantly obtaining the above-mentioned effects of having sufficient ignition ability as a marine fuel and having sufficient homogeneity not to separate in the fuel tank, is preferably 0.7 or more, more preferably 0.8 or more, and even more preferably 0.9 or more. In the second embodiment, the ratio (volume ratio) of the fatty acid ester to methanol may be, for example, 5 or less or 4 or less, or may be 3 or less, 2 or less, 1.5 or less, 1.3 or less, or 1.1 or less.

[0040] In the second embodiment, the ratio (volume ratio) of the fatty acid ester to the aromatic compound may be, for example, 0.6 or more, 0.8 or more, 1 or more, or 1.2 or more. In the second embodiment, the ratio (volume ratio) of the fatty acid ester to the aromatic compound may be, for example, 5 or less, 4 or less, 3 or less, or 2 or less.

[0041] In the second embodiment, the ratio (volume ratio) of the fatty acid ester to the first fuel oil may be, for example, 0.8 or more, 0.9 or more, 1 or more, or 1.4 or more. In the second embodiment, the ratio (volume ratio) of the fatty acid ester to the first fuel oil may be, for example, 5 or less, 4 or less, 3 or less, or 2 or less.

[0042] In the second embodiment, the total content of methanol, fatty acid ester, and first fuel oil may be, for example, 90% by volume or more, 95% by volume or more, 97% by volume or more, or 99% by volume or more, or may be 100% by volume.

[0043] In the second embodiment, the components other than those described above are not particularly limited. The fuel composition of the second embodiment may contain, for example, any of the components contained in known fuel oils (e.g., residual oil (atmospheric distillation residual oil, vacuum distillation residual oil, direct desulfurized residual oil), heavy oil (direct desulfurized heavy oil, hydrocracked heavy oil, catalytic cracked heavy oil), light oil (straight run light oil, direct desulfurized light oil, hydrocracked light oil, catalytic cracked light oil, thermal cracked light oil, etc.) used for marine fuels, etc.

[0044] <Third Aspect> The fuel composition of the third embodiment contains 10% by volume or more of methanol, 20% by volume or more of a fatty acid ester having an aliphatic hydrocarbon group having 8 to 24 carbon atoms, and an aliphatic hydrocarbon.

[0045] The fuel composition of the third aspect contains aliphatic hydrocarbons, and in addition to the above-mentioned effects of having sufficient ignition ability as a marine fuel and having sufficient homogeneity so that the fuel does not separate in the fuel tank, the fuel composition of the third aspect has the effect of making it easier to obtain a higher cetane number and further improving ignition ability.

[0046] In the third embodiment, the content of methanol is 10% by volume or more, preferably 15% by volume or more, more preferably 20% by volume or more, and may be 25% by volume or more. In the third embodiment, the content of methanol may be, for example, 75% by volume or less, preferably 70% by volume or less, more preferably 60% by volume or less, even more preferably 50% by mass or less, and even more preferably 45% by volume or less, and may be 40% by volume or less, 35% by volume or less, or 30% by volume or less.

[0047] In the third embodiment, the content of the fatty acid ester is 20% by volume or more, preferably 25% by volume or more, more preferably 30% by volume or more, and may be 35% by volume or more, or 40% by volume or more. In the third embodiment, the content of the fatty acid ester may be, for example, 80% by volume or less, preferably 70% by volume or less, more preferably 65% ​​by volume or less, and even more preferably 60% by volume or less.

[0048] In the third embodiment, the content of the aliphatic hydrocarbon may be, for example, 1.5% by volume or more, and from the viewpoint of increasing the cetane number and improving ignition performance, may be 2% by volume or more, 3% by volume or more, 5% by volume or more, 7% by volume or more, or 10% by volume or more. In addition, in the third embodiment, the content of the aliphatic hydrocarbon may be, for example, 50% by volume or less, 45% by volume or less, or 40% by volume or less, and from the viewpoint of more easily obtaining sufficient homogeneity (compatibility), is preferably 35% by volume or less, more preferably 30% by volume or less.

[0049] In the third embodiment, the total content of the methanol and the fatty acid ester may be, for example, 50% by volume or more, preferably 55% by volume or more, more preferably 60% by volume or more, even more preferably 65% ​​by volume or more, and may be 70% by volume or more. In the third embodiment, the total content of the methanol and the fatty acid ester may be, for example, 95% by volume or less, 90% by volume or less, 85% by volume or less, or 80% by volume or less.

[0050] The aliphatic hydrocarbon may be, for example, an aliphatic hydrocarbon having 8 to 30 carbon atoms, such as paraffin having 8 to 30 carbon atoms, olefin having 8 to 30 carbon atoms, or alicyclic compound having 8 to 30 carbon atoms. Of these, paraffin is preferred from the viewpoint of self-ignition property (cetane number).

[0051] In the third embodiment, the aliphatic hydrocarbon may be a part of a fuel oil. That is, the fuel composition of the third embodiment may contain methanol, a fatty acid ester, and a fuel oil containing an aliphatic hydrocarbon (hereinafter, a second fuel oil).

[0052] In the third embodiment, the content of the second fuel oil may be, for example, 5% by volume or more, 10% by volume or more, 15% by volume or more, or 20% by volume or more. In the third embodiment, the content of the second fuel oil may be, for example, 50% by volume or less, 45% by volume or less, 40% by volume or less, 35% by volume or less, or 30% by volume or less.

[0053] The content of aliphatic hydrocarbons in the second fuel oil may be, for example, 15% by volume or more, preferably 30% by volume or more, more preferably 50% by volume or more, and even more preferably 75% by volume or more. The content of aliphatic hydrocarbons in the second fuel oil may be, for example, 100% by volume or less, 95% by volume or less, 90% by volume or less, or 80% by volume or less.

[0054] The second fuel oil may further contain components other than aliphatic hydrocarbons. Examples of the components other than aliphatic hydrocarbons in the second fuel oil include aromatic compounds, alcohols other than methanol, and ethers.

[0055] The aromatic compound in the second fuel oil may be, for example, an aromatic hydrocarbon having 6 to 18 carbon atoms, such as benzene, toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, trimethylbenzene, propylbenzene, tetramethylbenzene, butylbenzene, hexylbenzene, tetralin, or methylnaphthalene.

[0056] The second fuel oil may be a known fuel oil used for marine fuel, etc. (for example, residual oil (atmospheric distillation residual oil, vacuum distillation residual oil, direct desulfurized residual oil), heavy oil (direct desulfurized heavy oil, hydrocracked heavy oil, catalytic cracked heavy oil), light oil (straight-run light oil, direct desulfurized light oil, hydrocracked light oil, catalytic cracked light oil, thermal cracked light oil, etc.), kerosene (straight-run kerosene, hydrocracked kerosene, catalytic cracked kerosene, thermal cracked kerosene), etc.) from the viewpoint of easily satisfying the above-mentioned range of the content of aliphatic hydrocarbons as the second fuel oil. From the viewpoint of easily satisfying the above-mentioned range of the content of aliphatic hydrocarbons, straight-run light oil, straight-run kerosene, etc. are preferable.

[0057] In the third aspect, the ratio (volume ratio) of the fatty acid ester to methanol is preferably 0.7 or more, more preferably 0.8 or more, and even more preferably 0.9 or more, from the viewpoint of further improving the above-mentioned effects that the compatibility between methanol and aliphatic hydrocarbons is further improved, the fuel has sufficient ignition ability as a marine fuel, and the fuel has sufficient homogeneity not to separate in the fuel tank. In the third aspect, the ratio (volume ratio) of the fatty acid ester to methanol may be, for example, 5 or less or 4 or less, or may be 3 or less, 2 or less, 1.5 or less, 1.3 or less, or 1.1 or less.

[0058] In the third embodiment, the ratio (volume ratio) of the fatty acid ester to the aliphatic hydrocarbon may be, for example, 0.9 or more, 1.0 or more, 1.1 or more, or 1.2 or more. In the third embodiment, the ratio (volume ratio) of the fatty acid ester to the aliphatic hydrocarbon may be, for example, 5 or less, 4 or less, 3 or less, or 2 or less.

[0059] In the third aspect, the ratio (volume ratio) of the fatty acid ester to the second fuel oil may be, for example, 0.7 or more, 0.8 or more, 0.9 or more, or 1.0 or more. In the third aspect, the ratio (volume ratio) of the fatty acid ester to the second fuel oil may be, for example, 5 or less, 4 or less, 3 or less, or 2 or less.

[0060] In the third aspect, the total content of methanol, fatty acid ester, and second fuel oil may be, for example, 90% by volume or more, 95% by volume or more, 97% by volume or more, or 99% by volume or more, or may be 100% by volume.

[0061] In the third embodiment, the components other than those described above are not particularly limited. The fuel composition of the third embodiment may contain, for example, any of the components contained in known fuel oils used for marine fuels (e.g., residual oil (atmospheric distillation residual oil, vacuum distillation residual oil, direct desulfurized residual oil), heavy oil (direct desulfurized heavy oil, hydrocracked heavy oil, catalytic cracked heavy oil), light oil (straight run light oil, direct desulfurized light oil, hydrocracked light oil, catalytic cracked light oil, thermal cracked light oil, etc.), kerosene (straight run kerosene, hydrocracked kerosene, catalytic cracked kerosene, thermal cracked kerosene), etc.).

[0062] The fuel composition of the present embodiment desirably has a sufficiently high cetane number to enable self-ignition. The cetane number of the fuel composition of the present embodiment may be, for example, 20 or more, preferably 25 or more, and more preferably 30 or more. There is no particular upper limit to the cetane number, but, for example, the cetane number of the fuel composition of the present embodiment may be 65 or less, 60 or less, or 55 or less.

[0063] In this specification, the cetane number refers to a value measured in accordance with JIS K2280-4 "Petroleum products - Determination of octane number, cetane number and cetane index". The cetane number of a fuel composition can also be estimated by calculating the cetane number of each component in the fuel composition proportionally based on the blending ratio of each component.

[0064] The total calorific value of the fuel composition of this embodiment may be, for example, 20 MJ / L or more, and from the viewpoint of being more suitable as a marine fuel, may be 24 MJ / L or more or 28 MJ / L or more. There is no particular upper limit to the total calorific value, but, for example, the total calorific value of the fuel composition of this embodiment may be 42 or less, 36 or less, or 32 or less.

[0065] In this specification, the total calorific value of a fuel composition refers to a value measured in accordance with JIS K2279 "Crude oil and petroleum products-Test method for calorific value and method for estimation by calculation." The total calorific value of a fuel composition can also be estimated by a calculated value obtained by dividing the total calorific value of each component in the fuel composition proportionally based on the blending ratio of each component.

[0066] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. EXAMPLES

[0067] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0068] First, the components shown in Table 1 below were prepared. [Table 1]

[0069] LCO is a catalytically cracked diesel fuel with an aromatic compound content of 60.4% by volume (other components are 37.5% by volume of saturates and 2.1% by volume of olefins).

[0070] The cetane number and total calorific value in the table were determined by the following method. <Cetane number> Measurements were made according to JIS K2280-4 "Petroleum products - Determination of octane number, cetane number and cetane index" or values ​​from literature were quoted. <Total heat generation> Measurements were performed in accordance with JIS K2279 "Crude oil and petroleum products - Calorific value test method and calculation method for estimation."

[0071] (Examples 1-1 to 1-5) A fuel composition was obtained by mixing the components shown in Table 1 in the blending ratios (volume %) shown in Table 2. The cetane number and total calorific value of the obtained fuel composition were determined by dividing the numerical values ​​of each component proportionally by the blending ratios shown in Table 2. The results are shown in Table 2.

[0072] The resulting fuel composition was shaken vigorously in a glass container, allowed to stand, and visually inspected for the presence or absence of separation. Cases where no separation occurred were rated as A, and cases where separation occurred were rated as B. The results are shown in Table 2.

[0073] [Table 2]

[0074] (Examples 2-1 to 2-9) A fuel composition was obtained by mixing the components shown in Table 1 in the blending ratios (volume %) shown in Table 3 or Table 4. The cetane number and total heating value of the obtained fuel composition were determined by dividing the numerical values ​​of each component proportionally by the blending ratios shown in Table 3 or Table 4. The results are shown in Table 3 or Table 4.

[0075] The resulting fuel composition was shaken vigorously in a glass container, allowed to stand, and visually inspected for the presence or absence of separation. Cases where no separation occurred were rated as A, and cases where separation occurred were rated as B. The results are shown in Table 3 or Table 4.

[0076] [Table 3]

[0077] [Table 4]

[0078] (Examples 3-1 to 3-7) A fuel composition was obtained by mixing the components shown in Table 1 in the blending ratios (volume %) shown in Table 5 or Table 6. The cetane number and total calorific value of the obtained fuel composition were determined by dividing the numerical values ​​of each component proportionally by the blending ratios shown in Table 5 or Table 6. The results are shown in Table 5 or Table 6.

[0079] The resulting fuel composition was shaken vigorously in a glass container, allowed to stand, and visually inspected for the presence or absence of separation. Cases where no separation occurred were rated as A, and cases where separation occurred were rated as B. The results are shown in Table 5 or Table 6.

[0080] [Table 5]

[0081] [Table 6]

[0082] (Comparative Examples 1 to 4) A fuel composition was obtained by mixing the components shown in Table 1 in the blending ratios (volume %) shown in Table 7. The cetane number and total calorific value of the obtained fuel composition were determined by dividing the numerical values ​​of each component proportionally by the blending ratios shown in Table 7. The results are shown in Table 7.

[0083] The resulting fuel composition was shaken vigorously in a glass container, allowed to stand, and visually inspected for the presence or absence of separation. Cases where no separation occurred were rated as A, and cases where separation occurred were rated as B. The results are shown in Table 7.

[0084] [Table 7]

[0085] As shown in Tables 1 to 7, it was confirmed that the fuel compositions of the examples had sufficiently high cetane numbers to enable self-ignition and were suitable for use as a single marine fuel. On the other hand, the fuel compositions of Comparative Examples 1 and 3 underwent phase separation, making it impossible to obtain uniform fuel properties. In addition, the fuel compositions of Comparative Examples 2 and 4 had low cetane numbers and insufficient ignition properties.

Claims

1. 10% by volume or more of methanol; a fatty acid ester having 20% ​​by volume or more of an aliphatic hydrocarbon group having 8 to 24 carbon atoms; 1. A marine fuel composition comprising:

2. 2. The marine fuel composition according to claim 1, wherein the ratio (volume ratio) of the fatty acid ester to the methanol is 0.7 or more.

3. 2. The marine fuel composition according to claim 1, wherein the total content of the methanol and the fatty acid ester is 50 volume % or more.

4. 2. The marine fuel composition of claim 1, further comprising an aromatic compound.

5. 5. A marine fuel composition according to claim 4, wherein the content of the aromatic compounds is 3 vol% or more and 35 vol% or less.

6. 2. The marine fuel composition of claim 1, further comprising an aliphatic hydrocarbon.

7. 7. The marine fuel composition according to claim 6, wherein the aliphatic hydrocarbons comprise paraffins.

8. 7. A marine fuel composition according to claim 6, wherein the content of the aliphatic hydrocarbons is 1.5 vol% or more and 40 vol% or less.

9. 7. A marine fuel composition according to claim 6, wherein the ratio (volume ratio) of the fatty acid ester to the methanol is 0.9 or more.

10. 7. A marine fuel composition according to claim 6, wherein the ratio (volume ratio) of said fatty acid ester to said aliphatic hydrocarbon is 0.9 or more.

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