Heavy oil composition A and method for producing heavy oil composition A

Abstract

To provide an A heavy oil composition that can easily suppress the clogging of a filter due to the growth of wax crystals while suppressing the use of a low-temperature fluidity enhancer with no increase in manufacturing cost even when including a lighter intermediate fraction base material as a constituent base material.SOLUTION: Provided is an A heavy oil composition comprising a mixed base having a total content of 0.020 mass% or less of linear saturated hydrocarbons having 29 or more carbon atoms including an intermediate fraction base and a residual carbon regulator, a linear saturated hydrocarbon-imparting base containing a linear saturated hydrocarbon having 30 to 40 carbon atoms, and a low-temperature fluidity enhancer, the A heavy oil composition containing the linear saturated hydrocarbon having 30 to 40 carbon atoms in a specific ratio that satisfies a specific formula.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a heavy oil composition A and a method for producing the heavy oil composition A. [Background technology]

[0002] Heavy oil compositions have traditionally been used for a variety of purposes in various industrial fields, and are classified into three types according to kinematic viscosity in JIS K2205: Type 1 (heavy oil A), Type 2 (heavy oil B), and Type 3 (heavy oil C). Of these heavy oil compositions, heavy oil A (heavy oil composition A) is used as fuel oil for heaters for greenhouse heating, heaters for buildings, and fuel oil for fishing boats.

[0003] In general, a heavy oil composition A contains one or more middle distillate base stocks selected from straight-run kerosene or desulfurized kerosene obtained from an atmospheric distillation unit, straight-run light diesel oil or desulfurized straight-run light diesel oil, light cycle oil obtained from a fluid catalytic cracking unit, and directly desulfurized light diesel oil obtained from a direct desulfurization unit, and further contains residual oils such as atmospheric distillation residual oil, vacuum distillation residual oil, directly desulfurized residual oil, and extract oil (a by-product oil obtained by solvent extraction of lubricating oil) as a carbon residue adjuster (carbon residue imparting base stock).

[0004] Regarding the residual carbon content of heavy oil composition A, JIS K 2205 (heavy oil) specifies that it must be 4 mass% or less. In addition, to clarify the product classification from light oil composition and to avoid being subject to light oil transaction tax, heavy oil composition A must contain a residual carbon content of 0.2 mass% or more of 10% residual oil.

[0005] Incidentally, engines and various combustion appliances that use heavy oil composition A as fuel are equipped with filters with mesh sizes of approximately 5 to 250 μm in the fuel system, etc., which remove foreign matter from the fuel oil and protect the precision equipment downstream. However, it is known that when the oil temperature drops in winter, high-carbon-number n-paraffins (high-carbon-number linear saturated hydrocarbons) precipitate as wax crystals and clog the above-mentioned filters.

[0006] Therefore, in order to suppress the clogging of fuel filters due to the precipitation of wax crystals, for example, Patent Document 1 proposes adding a cold flow improver (CFI) to a heavy oil composition A to inhibit the growth of wax crystals and refine the wax crystals that are formed. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-292977 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0008] In recent years, due to changes in production patterns, heavy middle distillate base stocks containing large amounts of high carbon number linear saturated hydrocarbons are no longer used, and heavy oil A compositions have tended to become lighter.

[0009] However, the inventors have found through their investigations that in the lightened heavy oil composition A, the effect of inhibiting the growth of wax crystals due to the addition of the above-mentioned low-temperature fluidity improver is reduced, making it difficult to refine the wax crystals that are formed.

[0010] For this reason, in order to maintain the low temperature fluidity of the lightened heavy oil composition A, measures have been considered, such as using an even lighter base material as the constituent base material of the heavy oil composition A, or increasing the amount of low temperature fluidity improver added. However, the above measures require light base stocks that are not normally used as base stocks for heavy oil A (but are useful as base stocks for fuel oils other than heavy oil A), and they also require an increased amount of cold flow improver used, which can easily lead to an increase in the production costs of the heavy oil A composition.

[0011] Under these circumstances, the present invention aims to provide a fuel oil composition A that can easily suppress the growth of wax crystals without increasing the content of cold flow improvers or increasing production costs, even when the composition contains a lighter middle distillate base stock than conventional ones, and to provide a method for producing the fuel oil composition A. [Means for solving the problem]

[0012] As a result of intensive research conducted by the present inventors in order to solve the above technical problems, they found that the above technical problems can be solved by an A heavy oil composition that contains a mixed base stock having a total content of linear saturated hydrocarbons having 29 or more carbon atoms, including a middle distillate base stock and a carbon residue adjuster, of 0.020 mass% or less; a linear saturated hydrocarbon-imparting base stock containing linear saturated hydrocarbons having 30 to 40 carbon atoms; and a low-temperature fluidity improver, wherein the linear saturated hydrocarbons having 30 to 40 carbon atoms are contained in a manner that satisfies a specific relationship, and they have completed the present invention based on this finding.

[0013] That is, the present invention is (1) A mixed base material containing a middle distillate base material and a carbon residue adjuster, and having a total content of linear saturated hydrocarbons having 29 or more carbon atoms of 0.020% by mass or less; a linear saturated hydrocarbon-imparting base material containing linear saturated hydrocarbons having 30 to 40 carbon atoms; and a low-temperature fluidity improver; The total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005% by mass or more, The linear saturated hydrocarbon having 30 to 40 carbon atoms is represented by the following formula (I):

number

number

[0014] According to the present invention, it is possible to provide an A fuel oil composition that can easily suppress filter clogging due to wax crystal growth, while reducing the amount of cold flow improver used and without increasing production costs, even when the composition contains a lighter middle distillate base stock than conventional ones, and it is also possible to provide a method for producing an A fuel oil composition. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described in detail. In this specification, the use of "to" to indicate a range of values ​​indicates a range that includes the values ​​stated as the upper and lower limits. When a unit is stated for only the upper limit of a range of values ​​expressed by "to," this means that the lower limit is also expressed in the same unit. In the numerical ranges described in stages in this specification, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. In this specification, the content or amount of each component in a composition means, unless otherwise specified, the total content or amount of the multiple substances present in the composition when multiple substances corresponding to each component are present in the composition. As used herein, combinations of preferred embodiments are more preferred embodiments.

[0016] In this specification, unless otherwise specified, the values ​​of the following items are values ​​determined using the following test methods and calculations. "Ratio of straight chain saturated hydrocarbons (n-paraffins)" The content of n-paraffins by carbon number was measured using a gas chromatograph with a flame ionization detector (GC-FID) under the following measurement conditions. Equipment: Agilent 6890N manufactured by Agilent Technologies Column: DB-1 60m x 0.32mm ID DF: 0.25μm Detector: FID 350℃ Oven temperature: 60℃ (5 min) - 6℃ / min - 340℃ (14 min) Inlet: Oven track mode (oven temperature +3°C) Carrier gas: He 152 kPa (2.9 ml / min) constant pressure Make-up gas: Nitrogen 25ml / min FID combustion gas: H230ml / min, Air 400ml / min Injection volume: 0.5 μl on-column injection Quantitative method: Internal standard method (internal standard: di-n-butyl phthalate) Sample dilution: 0.1 g sample, 1 ml internal standard solution, 4 ml toluene Baseline: Corrected "Atmospheric distillation properties (distillation temperature)" This is the method specified in the "Atmospheric pressure distillation test method" in JIS K 2254:1998 "Petroleum products - Distillation test method." - "Ratio of saturated hydrocarbons (saturated content)" The method specified in JPI-5S-49-2007 "Petroleum products - Hydrocarbon type test method - High performance liquid chromatography method." "Aromatic hydrocarbon (aromatic content) content, monocyclic aromatic hydrocarbon (monocyclic aromatic content) content, bicyclic aromatic hydrocarbon (bicyclic aromatic content) content, tricyclic aromatic hydrocarbon (tricyclic aromatic content) content"; The method specified in JPI-5S-49-2007 "Petroleum products - Hydrocarbon type test method - High performance liquid chromatography method." "Olefin content" The method specified in JPI-5S-49-2007 "Petroleum products - Hydrocarbon type test method - High performance liquid chromatography method." "Resin and asphaltene content" This is the method specified in JPI-5S-22-83 "Composition analysis of asphalt by column chromatography." However, for the resin fraction, liquid chromatography was used instead of column chromatography. The operating parameters for liquid chromatography were as follows: [Table 1] "Sulfur content" Sulfur content of 500 mass ppm or less: Method specified in JIS K 2541-6:2003 "Crude oil and petroleum products - Determination of sulfur content - Part 6: Ultraviolet fluorescence method." Sulfur content exceeding 500 ppm by mass: Method specified in JIS K 2541-4:2003 "Crude oil and petroleum products - Determination of sulfur content - Part 4: Radiation excitation method." ·"flash point" The method specified in JIS K 2265-3:2007 "Determination of flash point - Part 3: Pensky-Martens closed-cell method" (PM method). However, for straight-run kerosene, which will be described later, JIS K 2265-1:2007 "How to determine flash point - Part 1: Tag-sealed method" The method specified in (TAG method). "Density at 15°C (Density (15°C))" This is the method specified in JIS K 2249-1:2011 "Crude oil and petroleum products - Determination of density - (Vibration method)". "Kinematic viscosity at 50°C (Kinematic viscosity (50°C))" This is the method specified in JIS K 2283:2000 "Crude oil and petroleum products - Kinematic viscosity test method and viscosity index calculation method." "Carbon residue" This is the method specified in JIS K 2270-2:2009 "Crude oil and petroleum products - Determination of residual carbon content - Part 2: Micro method." "10% residual carbon content of residual oil" This is the method specified in JIS K 2270-2:2009 "Crude oil and petroleum products - Determination of residual carbon content - Part 2: Micro method." Cloud Point The method specified in JIS K 2269:1987 "Test method for pour point and cloud point of crude oil and petroleum products." - "Clogging Point (CFPP)" This is the method specified in JIS K 2288:2000 "Petroleum products - Light oil - Test method for clogging point." ·“Pour point (PP)” The method specified in JIS K 2269:1987 "Test method for pour point and cloud point of crude oil and petroleum products." "Wax precipitation point and wax precipitation amount of heavy oil composition A" In the measurement chart obtained when measuring under the following conditions using a differential scanning calorimeter (DSC), the extrapolated onset temperature of the detected exothermic peak was taken as the wax deposition point, and the amount of wax deposition was calculated from the heat quantity (J / g) of the detected exothermic peak. <Measuring equipment> Differential scanning calorimeter: Rigaku DSCvesta Sample container: Aluminum, capacity 50 μl (open type) Atmosphere: Nitrogen Flow rate: 50 ml / min Temperature conditions: Cool from room temperature to 15°C at 5°C / min, then cool to 10°C at 3°C / min and hold for 5 minutes, then cool to -30°C at 3°C / min.

[0017] The heavy oil composition A according to the present invention comprises: The oil composition comprises a mixed base material having a total content of linear saturated hydrocarbons having 29 or more carbon atoms of 0.020% by mass or less, including a middle distillate base material and a carbon residue adjuster, a linear saturated hydrocarbon imparting base material containing linear saturated hydrocarbons having 30 to 40 carbon atoms, and a low-temperature fluidity improver; The total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005% by mass or more, The linear saturated hydrocarbon having 30 to 40 carbon atoms is represented by the following formula (I):

number

[0018] The blend base stock constituting the A heavy oil composition according to the present invention has a total content of linear saturated hydrocarbons having 29 or more carbon atoms of 0.020% by mass or less (0.000 to 0.020% by mass), suitably 0.015% by mass or less (0.000 to 0.015% by mass), more suitably 0.012% by mass or less (0.000 to 0.012% by mass), and even more suitably 0.000% by mass.

[0019] In the blend base stock constituting the A heavy oil composition according to the present invention, the linear saturated hydrocarbons having 29 or more carbon atoms are It means straight chain saturated hydrocarbons with an alkyl group of 60 or less.

[0020] According to the present invention, it is possible to provide an A heavy oil composition that can easily suppress filter clogging due to wax crystal growth while reducing the amount of low-temperature flow improver used and without increasing production costs, even though the mixed base stock contains as its main constituent base stock a lighter base stock than conventional base stocks, with a total content of linear saturated hydrocarbons having 29 or more carbon atoms of 0.020 mass% or less.

[0021] The blend base stock constituting the A heavy oil composition according to the present invention includes a middle distillate base stock.

[0022] In the A heavy oil composition of the present invention, the middle distillate base stock is not particularly limited as long as it can form a blend base stock that, when mixed with a carbon residue regulator, has a total content of linear saturated hydrocarbons having a carbon number of 29 or more within the above range. Examples include one or more light oil base stocks that have traditionally been used as constituent base stocks for A heavy oil compositions, such as straight-run kerosene obtained from an atmospheric distillation unit, desulfurized straight-run kerosene, straight-run light diesel oil obtained from an atmospheric distillation unit, desulfurized straight-run light diesel oil, light cycle oil obtained from a fluid catalytic cracking unit, and direct desulfurized light diesel oil obtained from a direct desulfurization unit.

[0023] When the middle distillate base stock is composed of two or more types of diesel base stock, they may be appropriately selected and mixed in the desired amounts so that the resulting diesel fuel composition exhibits the desired physical properties (e.g., density, distillation characteristics, sulfur content, kinematic viscosity, etc.).

[0024] The blend base material constituting the A fuel oil composition according to the present invention contains a carbon residue control agent.

[0025] In the A heavy oil composition of the present invention, the carbon residue adjuster is not particularly limited as long as it can form a blend base stock that, when mixed with a middle distillate base stock, has a total content of linear saturated hydrocarbons having a carbon number of 29 or more within the above-mentioned range. Examples of carbon residue adjusters include one or more selected from carbon residue adjusters that have traditionally been used as base stocks for A heavy oil compositions, such as atmospheric distillation residual oil, vacuum distillation residual oil, direct desulfurization residual oil, and extract oil (a by-product oil obtained by solvent extraction of lubricating oil).

[0026] The blend base stock constituting the A heavy oil composition of the present invention preferably contains 98.0 to 99.9 volume % of the middle distillate base stock, more preferably 98.2 to 99.9 volume %, and even more preferably 98.4 to 99.9 volume %. Furthermore, the mixed base material constituting the A heavy oil composition of the present invention preferably contains 0.1 to 2.0 volume %, more preferably 0.1 to 1.8 volume %, and even more preferably 0.1 to 1.6 volume % of a carbon residue control agent.

[0027] The A fuel oil composition according to the present invention preferably contains 99.000 to 99.800 mass %, more preferably 99.000 to 99.700 mass %, and even more preferably 99.000 to 99.600 mass % of the mixed base stock. The heavy oil composition A of the present invention contains the blend base material in the above proportions, and therefore can easily exhibit the desired properties (e.g., density, distillation properties, sulfur content, kinematic viscosity, etc.) of the heavy oil composition A.

[0028] The A heavy oil composition according to the present invention contains a linear saturated hydrocarbon-imparting base material containing linear saturated hydrocarbons having 30 to 40 carbon atoms.

[0029] In the heavy oil composition A according to the present invention, the linear saturated hydrocarbon-imparting base material may be a fraction containing linear saturated hydrocarbons (normal paraffins) having 30 to 40 carbon atoms obtained by petroleum refining, a reagent, or the like, or may be a normal paraffin-based fraction obtained from so-called biofuels or a normal paraffin-based fraction obtained by Fischer-Tropsch (FT) synthesis. Examples of such linear saturated hydrocarbon-imparting substrates include synthesis gas (Syngass) consisting mainly of H2 and CO obtained by feeding woody biomass into a gasification furnace, and synthesis gas obtained by electrolyzing CO2, followed by the Fischer-Tropsch (FT) reaction to obtain a fraction containing linear saturated hydrocarbons with 30 to 40 carbon atoms as the main component.

[0030] In the A heavy oil composition according to the present invention, the linear saturated hydrocarbon-imparting base material preferably contains 90 to 100 volume %, more preferably 93 to 100 volume %, and even more preferably 96 to 100 volume % of linear saturated hydrocarbons having 30 to 40 carbon atoms.

[0031] The heavy oil composition A according to the present invention preferably contains 0.005 to 0.110 mass %, more preferably 0.005 to 0.100 mass %, and even more preferably 0.005 to 0.090 mass % of a linear saturated hydrocarbon-imparting base material. Since the A heavy oil composition of the present invention contains the linear saturated hydrocarbon-imparting base material in the above-mentioned proportion, it can easily contain the desired amount of each linear saturated hydrocarbon having 30 to 40 carbon atoms so as to satisfy the specified total content and formula (I) (as will be described later).

[0032] The fuel oil composition A according to the present invention contains a cold flow improver (CFI). In the heavy oil composition A according to the present invention, the cold flow improver is not particularly limited, and may be any of the conventionally known ones. In the heavy oil A composition according to the present invention, the low-temperature fluidity improver may be one or more selected from polymer-type additives typified by ethylene-saturated carboxylic acid vinyl ester copolymers such as ethylene-vinyl acetate copolymers and ethylene-α-olefin copolymers, and ethylene-ethylenically unsaturated ester copolymers, and oil-soluble dispersant-type additives typified by long-chain dicarboxylic acid amides.

[0033] In the fuel oil A composition according to the present invention, the content of the cold flow improver is preferably 50 to 600 ppm by mass, more preferably 100 to 600 ppm by mass, and even more preferably 150 to 600 ppm by mass.

[0034] Even when the heavy oil composition of the present invention contains a lighter middle distillate base stock than conventional ones as a constituent base stock, as will be described later, it contains a desired amount of linear saturated hydrocarbons having 30 to 40 carbon atoms so as to satisfy a specific relationship, thereby making it possible to easily suppress filter clogging due to wax crystal growth while reducing the amount of cold flow improver used.

[0035] The A fuel oil composition according to the present invention may contain various additives in addition to the above-mentioned low-temperature fluidity improver. The additives are not particularly limited as long as they are those that are normally added to heavy oil compositions A, and examples thereof include one or more selected from pour point depressants, sludge dispersants, rust inhibitors, antioxidants, corrosion inhibitors, fungicides, antistatic agents, cetane number improvers, metal deactivators, etc. Furthermore, the fuel oil composition A according to the present invention may contain coumarin in view of the light oil delivery tax.

[0036] The fuel oil composition A according to the present invention has a total content of linear saturated hydrocarbons having 30 to 40 carbon atoms of 0.005% by mass or more.

[0037] By ensuring that the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms in the heavy oil composition A of the present invention is 0.005 mass% or more, the effect of refining wax crystals by adding a low-temperature fluidity improver can be easily achieved.

[0038] In the fuel oil composition A according to the present invention, the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is preferably 0.005 to 0.110 mass%, more preferably 0.005 to 0.100 mass%, and even more preferably 0.005 to 0.090 mass%.

[0039] By ensuring that the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms in the heavy oil composition A according to the present invention is within the above range, the linear saturated hydrocarbons having 30 to 40 carbon atoms can be easily dispersed and dissolved, and wax deposition can be suppressed while filter clogging can be easily suppressed.

[0040] In the fuel oil composition A according to the present invention, the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms can be easily controlled by selecting appropriate linear saturated hydrocarbon-imparting base materials and blending base materials that constitute the fuel oil composition A, and then adjusting the blending amounts thereof.

[0041] The heavy oil composition A according to the present invention is a composition comprising linear saturated hydrocarbons having 30 to 40 carbon atoms, the linear saturated hydrocarbons being represented by the following formula (I):

number

[0042] The above formula (I) means that in the heavy oil composition A of the present invention, the sum of the total content (mass%) of linear saturated hydrocarbons having 30 to 34 carbon atoms, twice the total content (mass%) of linear saturated hydrocarbons having 35 to 36 carbon atoms, and 20 times the total content (mass%) of linear saturated hydrocarbons having 37 to 40 carbon atoms is 0.110 (mass%) or less.

[0043] In the A heavy oil composition of the present invention, the sum of the total content (mass%) of linear saturated hydrocarbons having 30 to 34 carbon atoms, twice the total content (mass%) of linear saturated hydrocarbons having 35 to 36 carbon atoms, and 20 times the total content (mass%) of linear saturated hydrocarbons having 37 to 40 carbon atoms is preferably 0.005 to 0.110 (mass%), more preferably 0.010 to 0.105 (mass%), and even more preferably 0.050 to 0.100 (mass%).

[0044] In the heavy oil composition A of the present invention, the sum of the total content (mass%) of linear saturated hydrocarbons having 30 to 34 carbon atoms, twice the total content (mass%) of linear saturated hydrocarbons having 35 to 36 carbon atoms, and 20 times the total content (mass%) of linear saturated hydrocarbons having 37 to 40 carbon atoms satisfies the above-mentioned requirements. This makes it possible to improve the effect of adding a cold flow improver (CFI) and effectively reduce the plugging point without increasing the cloud point by 3°C or more, while maintaining the linear saturated hydrocarbons having 30 to 40 carbon atoms in a suitably dissolved state.

[0045] As described above, in a heavy oil composition A containing a lighter middle distillate base stock as a constituent base stock compared to conventional compositions, i.e., a mixed base stock having a total content of linear saturated hydrocarbons having 29 or more carbon atoms, including a middle distillate base stock and a carbon residue adjuster, of 0.020 mass% or less, even when a low-temperature fluidity improver is added, the wax crystal growth inhibition effect is reduced, making it difficult to refine the wax crystals that are formed and improve the filter plugging point.

[0046] On the other hand, the inventors have conducted studies and found that when linear saturated hydrocarbons having 30 to 34 carbon atoms are added to the above-mentioned heavy oil composition A in a total amount of approximately 0.005% by mass to 0.100% by mass, the clogging point can be lowered without increasing the cloud point by 3°C or more (the effect of the low-temperature fluidity improver in inhibiting the growth of wax crystals can be suitably exerted), and that when linear saturated hydrocarbons having 30 to 34 carbon atoms are added to the above-mentioned heavy oil composition A in an amount exceeding approximately 0.100% by mass, the cloud point does not increase by 3°C or more and the clogging point cannot be lowered. Furthermore, it was found that when linear saturated hydrocarbons having 35 to 36 carbon atoms are added to the above-mentioned heavy oil composition A in a total amount of approximately 0.005 to 0.050 mass%, the clogging point can be lowered without increasing the cloud point by 3°C or more (the wax crystal growth inhibitor effect of the low-temperature fluidity improver can be suitably exerted), and that when linear saturated hydrocarbons having 35 to 36 carbon atoms are added to the above-mentioned heavy oil composition A in an amount exceeding approximately 0.050 mass%, the cloud point does not increase by 3°C or more and the clogging point cannot be lowered. Furthermore, it was found that when a total of approximately 0.005 mass% of linear saturated hydrocarbons having 37 to 40 carbon atoms is added to the above-mentioned heavy oil composition A, the clogging point can be lowered without increasing the cloud point by 3°C or more (the effect of the low-temperature fluidity improver in inhibiting the growth of wax crystals can be suitably exerted), and that when more than approximately 0.005 mass% of linear saturated hydrocarbons having 37 to 40 carbon atoms are added to the above-mentioned heavy oil composition A, they cannot be dissolved.

[0047] The heavy oil composition A of the present invention was completed based on the above findings, and since the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is at least 0.005 (mass%), i.e., the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005 mass% or more, the low-temperature fluidity improver can preferably exhibit the wax crystal growth inhibitory effect.

[0048] Furthermore, the heavy oil composition A of the present invention can preferably exhibit the wax crystal growth inhibitory effect of the low-temperature fluidity improver by containing up to about 0.100 mass% of linear saturated hydrocarbons having 30 to 34 carbon atoms, up to a total of about 0.050 mass% of linear saturated hydrocarbons having 35 to 36 carbon atoms, or up to a total of about 0.005 mass% of linear saturated hydrocarbons having 37 to 40 carbon atoms, and from this finding it was thought that the wax crystal growth inhibitory effect of the low-temperature fluidity improver could be preferably exhibited to the extent that the above formula (I) was satisfied.

[0049] The heavy oil composition A according to the present invention preferably has a wax deposition amount at a temperature −6° C. lower than the wax deposition point that is greater than 0.0 mass % and not more than 1.9 mass %, more preferably 0.0 to 1.7 mass %, and even more preferably 0.0 to 1.5 mass %.

[0050] The heavy oil composition A of the present invention has a wax deposition amount within the above range at a temperature −6°C lower than the wax deposition point, so that wax deposition is continuously suppressed even when the temperature drops below the wax deposition point, and filter clogging due to wax crystal growth can be easily suppressed.

[0051] The fuel oil composition A according to the present invention preferably has a saturated content of 45.0 to 80.0% by volume, more preferably 50.0 to 75.0% by volume, and even more preferably 55.0 to 70.0% by volume. Since the A heavy oil composition of the present invention has a saturated content within the above range, it can easily dissolve and disperse the linear saturated hydrocarbon-imparting base material containing linear saturated hydrocarbons having 30 to 40 carbon atoms, and can easily exhibit the wax crystal growth inhibitory effect of the low-temperature fluidity improver provided by the addition of the linear saturated hydrocarbon-imparting base material.

[0052] The fuel oil composition A according to the present invention preferably has an olefin content of 0.0 to 3.0% by volume, more preferably 0.0 to 2.0% by volume, and even more preferably 0.0 to 1.0% by volume. The A fuel oil composition of the present invention can easily exhibit appropriate oxidation stability by having the olefin content within the above range.

[0053] The A fuel oil composition according to the present invention preferably has an aromatic content of 20 to 60% by volume, more preferably 25 to 55% by volume, and even more preferably 30 to 50% by volume. In the fuel oil composition A according to the present invention, the aromatic content falls within the above range, so that the carbon residue control agent can be easily dissolved and dispersed.

[0054] The cloud point of the A fuel oil composition according to the present invention is preferably from -20 to 10°C, more preferably from -15 to 8°C, and even more preferably from -10 to 5°C. When the cloud point of the A fuel oil composition according to the present invention is within the above range, the effect of adding the linear saturated hydrocarbon-imparting base material can be efficiently achieved. It is possible.

[0055] The fuel oil composition A according to the present invention preferably has a filter plugging point of -5°C or lower, more preferably -10°C or lower, and even more preferably -15°C or lower. By having the filter plugging point of the fuel oil composition A according to the present invention be -5°C or lower, the fluidity of the fuel oil composition A can be suitably ensured even in winter. There is no particular restriction on the lower limit of the filter plugging point of the fuel oil composition A according to the present invention, but the filter plugging point of the fuel oil composition A according to the present invention is usually -40°C or higher.

[0056] The pour point of the A fuel oil composition according to the present invention is preferably -10.0°C or lower, more preferably -15.0°C or lower, and even more preferably -20.0°C or lower. By ensuring that the pour point of the fuel oil composition A according to the present invention is −10.0° C. or lower, the fluidity of the fuel oil composition A can be suitably ensured even in cold regions in winter. There is no particular lower limit for the pour point of the fuel oil composition A according to the present invention, but the pour point of the fuel oil composition A according to the present invention is usually -60.0°C or higher.

[0057] The fuel oil composition A according to the present invention has a density of 0.810 g / cm at 15°C. 3 ~0.890g / cm 3 Preferably, it is 0.812 g / cm 3 ~0.888g / cm 3 More preferably, it is 0.814 g / cm 3 ~0.886g / cm 3 It is more preferable that: When the density of the A fuel oil composition at 15°C is within the above range, good combustion conditions can be easily achieved when the A fuel oil composition is combusted.

[0058] The heavy oil composition A according to the present invention has a kinematic viscosity at 50°C of 1.5 mm 2 / sec~6.0mm 2 / sec is preferred, and 1.6 mm 2 / sec ~5.9mm 2 / sec is more preferable, and 1.7 mm 2 / sec~5.8mm 2 / sec is even more preferable. By ensuring that the kinematic viscosity at 50°C of the heavy oil composition A of the present invention is within the above range, it becomes possible to suppress uneven combustion and misfires, and it becomes possible to supply the heavy oil composition A stably.

[0059] The fuel oil composition A according to the present invention preferably has a sulfur content of 1.20 mass% or less (0.00 mass% to 1.20 mass%), more preferably 1.10 mass% or less (0.00 mass% to 1.10 mass%), and even more preferably 1.00 mass% or less (0.00 mass% to 1.00 mass%). By ensuring that the sulfur content of the fuel oil composition A according to the present invention is within the above range, the sulfur content of the fuel oil composition A according to the present invention can be easily controlled within an appropriate range, making it possible to easily suppress the production of sulfur compounds during combustion.

[0060] The A fuel oil composition according to the present invention preferably has a 10.0% by volume distillation temperature in atmospheric distillation of 140.0°C to 240.0°C, more preferably 150.0°C to 230.0°C, and even more preferably 160.0°C to 220.0°C.

[0061] The A heavy oil composition according to the present invention preferably has a 50.0% by volume distillation temperature in atmospheric distillation of 230.0°C to 330.0°C, more preferably 240.0°C to 320.0°C, and even more preferably 250.0°C to 310.0°C.

[0062] The A heavy oil composition according to the present invention preferably has a 90.0% by volume distillation temperature in atmospheric distillation of 300.0°C to 390.0°C, more preferably 305.0°C to 385.0°C, and even more preferably 310.0°C to 380.0°C.

[0063] The heavy oil composition A according to the present invention preferably has a residual carbon content of 0.20 mass% to 1.00 mass% in 10% residual oil, more preferably 0.20 mass% to 0.90 mass%, and even more preferably 0.20 mass% to 0.80 mass%. By ensuring that the residual carbon content of the 10% residual oil of the A heavy oil composition according to the present invention is within the above range, it is possible to satisfies tax regulations and to suitably suppress sludge formation.

[0064] The fuel oil composition A according to the present invention preferably has a flash point of 60.0°C or higher, more preferably 70.0°C or higher, and even more preferably 80.0°C or higher. The heavy oil composition A according to the present invention has a flash point of 60.0°C or higher, which makes it easier to handle.

[0065] The fuel oil composition A according to the present invention can be suitably produced by the production method of the present invention described below.

[0066] According to the present invention, it is possible to provide an A-type heavy oil composition that can easily suppress filter clogging due to wax crystal growth, while reducing the amount of cold flow improver used and without increasing production costs, even when the composition contains a lighter middle distillate base stock than conventional ones as a constituent base stock.

[0067] Next, a method for producing the fuel oil composition A according to the present invention will be described. The method for producing the A heavy oil composition according to the present invention comprises: A mixed base material containing a middle distillate base material and a carbon residue adjuster and having a total content of linear saturated hydrocarbons having a carbon number of 29 or more of 0.020 mass% or less, a linear saturated hydrocarbon-imparting base material containing linear saturated hydrocarbons having a carbon number of 30 to 40, and a low-temperature fluidity improver, In the obtained heavy oil composition A, The total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005% by mass or more, The linear saturated hydrocarbon having 30 to 40 carbon atoms is represented by the following formula (I):

number

[0068] In the method for producing an A heavy oil composition according to the present invention, the details of the middle distillate base stock, the carbon residue control agent and the blending base stock are as described above, and the details of the linear saturated hydrocarbon imparting base stock are also as described above. In the method for producing the A heavy oil composition according to the present invention, the suitable mixing ratios of the blending base stock and the linear saturated hydrocarbon-imparting base stock correspond to the respective content ratios in the A heavy oil composition according to the present invention described above, and the details thereof are as described above. Furthermore, in the method for producing the A heavy oil composition according to the present invention, specific examples of the low-temperature fluidity improver are as described above, and the mixing ratio thereof corresponds to the content ratio in the A heavy oil composition according to the present invention described above, and the details thereof are as described above.

[0069] In the method for producing the A heavy oil composition according to the present invention, the blending base material, the linear saturated hydrocarbon-imparting base material, and the low-temperature fluidity improver are mixed so that the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms in the resulting A heavy oil composition is within a specific range and the above formula (I) is satisfied. The total content of linear saturated hydrocarbons having 30 to 40 carbon atoms in the resulting heavy oil composition A and the details of the above formula (I) are also as described above.

[0070] In the method for producing the A heavy oil composition according to the present invention, the desired A heavy oil composition can be prepared by mixing the above-mentioned blending base material, linear saturated hydrocarbon-imparting base material, low-temperature fluidity improver, and, if necessary, other various additives. In this case, there are no particular limitations on the order or method of mixing the above-mentioned mixing base material, linear saturated hydrocarbon imparting base material, low-temperature fluidity improver, and other various additives added as needed.

[0071] The composition and physical properties of the fuel oil composition A obtained by the production method according to the present invention are as described in detail above in the description of the fuel oil composition A according to the present invention. In the production method according to the present invention, the amount of wax precipitated in the obtained fuel oil composition A at a temperature −6° C. lower than the wax precipitation point is preferably more than 0.0 mass % and not more than 1.9 mass %.

[0072] In the production method of the present invention, the amount of wax precipitated in the obtained heavy oil composition A at a temperature -6°C lower than the wax precipitation point is within the above range, so that wax precipitation is continuously suppressed even when the temperature drops below the wax precipitation point, and filter clogging due to wax crystal growth can be easily suppressed.

[0073] According to the present invention, it is possible to provide a simple method for producing an A heavy oil composition that can easily suppress filter clogging due to wax crystal growth, without increasing production costs, while reducing the amount of cold flow improver used, even when a lighter middle distillate base stock compared to conventional ones is used as the constituent base stock. [Example]

[0074] The present invention will be described in more detail below with reference to examples. However, these examples are representative examples of the present invention and are not intended to limit the scope of the present invention in any way. The analytical values ​​in the table were measured using the above-mentioned methods. Items marked with "-" indicate that they were not measured or that they were not contained.

[0075] In the following examples and comparative examples, the following middle distillate base stocks and carbon residue adjusters were used to constitute heavy oil composition A. The physical properties and compositions of each base stock are shown in Tables 2-1 to 2-3.

[0076] (middle distillate base stock) Straight-run kerosene Straight-run diesel Cracked diesel Hydrodesulfurized diesel (Residual carbon adjuster) Atmospheric distillation residue oil

[0077] [Table 2-1]

[0078] [Table 2-2]

[0079] [Table 2-3]

[0080] (Preparation of Mixed Base Materials A and B) The above base materials were mixed in the ratios shown in Table 3 to obtain mixed base materials A to B.

[0081] [Table 3]

[0082] (Comparative Example 1) An ethylene vinyl acetate copolymer-based cold pour point improver was mixed into the above-mentioned mixing base material A to a concentration of 200 ppm by mass, thereby obtaining a heavy oil composition A. The composition and physical properties of the resulting heavy oil composition A are shown in Tables 4-1 to 4-3.

[0083] (Examples 1 to 4, Comparative Example 2) A linear saturated hydrocarbon reagent having 30 carbon atoms (n-C30) was mixed into the above-mentioned mixing base material A to give a content of 0.005 mass% (Example 1), 0.010 mass% (Example 2), 0.050 mass% (Example 3), 0.100 mass% (Example 4), and 0.500 mass% (Comparative Example 2), respectively, and an ethylene vinyl acetate copolymer-based cold pour point improver was mixed in to give a concentration of 200 mass ppm each, thereby obtaining each of the A heavy oil compositions. The composition and physical properties of each of the resulting heavy oil compositions A are shown in Tables 4-1 to 4-3.

[0084] [Table 4-1]

[0085] [Table 4-2]

[0086] [Table 4-3]

[0087] (Examples 5 to 8, Comparative Example 3) A linear saturated hydrocarbon reagent having 34 carbon atoms (n-C34) was mixed into the above-mentioned mixed base material A to give a content of 0.005 mass% (Example 5), 0.010 mass% (Example 6), 0.050 mass% (Example 7), 0.100 mass% (Example 8), and 0.500 mass% (Comparative Example 3), respectively, and an ethylene vinyl acetate copolymer-based low-temperature fluidity improver was also mixed in to give a concentration of 200 ppm by mass, thereby obtaining each of the A heavy oil compositions. In Comparative Example 3, the linear saturated hydrocarbon remained undissolved at room temperature, making it impossible to measure the respective tests. The composition and physical properties of each of the resulting heavy oil compositions A are shown in Tables 5-1 to 5-3.

[0088] [Table 5-1]

[0089] [Table 5-2]

[0090] [Table 5-3]

[0091] (Examples 9 to 11, Comparative Example 4) A linear saturated hydrocarbon reagent having 36 carbon atoms (n-C36) was mixed into the above-mentioned mixing base material A to give a content of 0.005 mass% (Example 9), 0.010 mass% (Example 10), 0.050 mass% (Example 11), and 0.100 mass% (Comparative Example 4), respectively, and an ethylene vinyl acetate copolymer-based low-temperature fluidity improver was mixed in to give a concentration of 200 mass ppm each, thereby obtaining each of the A heavy oil compositions. The compositions and physical properties of each of the resulting heavy oil compositions A are shown in Tables 6-1 to 6-3.

[0092] [Table 6-1]

[0093] [Table 6-2]

[0094] [Table 6-3]

[0095] (Example 12, Comparative Examples 5 to 7) A linear saturated hydrocarbon (n-C40) reagent having 40 carbon atoms was mixed into the above-mentioned mixing base material A to give a content of 0.005 mass% (Example 12), 0.010 mass% (Comparative Example 5), 0.050 mass% (Comparative Example 6), and 0.100 mass% (Comparative Example 7), respectively, and an ethylene vinyl acetate copolymer-based low-temperature fluidity improver was also mixed in to give a concentration of 200 mass ppm each. In Example 12, heavy oil composition A was obtained, but in Comparative Examples 5 to 7, the linear saturated hydrocarbon having 40 carbon atoms did not dissolve, and the desired heavy oil composition A could not be obtained. The composition and physical properties of each of the resulting heavy oil compositions A are shown in Tables 7-1 to 7-3.

[0096] [Table 7-1]

[0097] [Table 7-2]

[0098] [Table 7-3]

[0099] Tables 4-1 and 4-2 show that, compared to the heavy oil composition A of Comparative Example 1, the heavy oil compositions A of Examples 1 to 4, which contain a total of 0.005% by mass to 0.100% by mass of linear saturated hydrocarbons having 30 carbon atoms, are able to lower the filter plugging point without increasing the cloud point by 3°C or more (the effect of the low-temperature fluidity improver in inhibiting the growth of wax crystals can be suitably exerted), and it is also clear that when 0.500% by mass of linear saturated hydrocarbons having 30 carbon atoms is added to the above heavy oil composition A, the cloud point does not increase by 3°C or more and the filter plugging point cannot be lowered (Comparative Example 2). Furthermore, Tables 4-1 and 4-2 show that in Examples 1 to 4, the amount of wax deposition at a temperature -6°C lower than the wax deposition point is greater than 0.0 mass% and not more than 1.9 mass%, which means that wax deposition can be continuously suppressed even when the temperature drops below the wax deposition point.

[0100] Tables 5-1 and 5-2 show that, compared to the heavy oil composition A of Comparative Example 1, the heavy oil compositions A of Examples 5 to 8, which contain a total of 0.005% by mass to 0.100% by mass of linear saturated hydrocarbons having 34 carbon atoms, can lower the plugging point without increasing the cloud point by 3°C or more (the low-temperature fluidity improver can effectively exert its wax crystal growth inhibitory effect), and that when 0.500% by mass of linear saturated hydrocarbons having 34 carbon atoms is added to the above heavy oil composition A, it cannot dissolve them (Comparative Example 3). Furthermore, Tables 5-1 and 5-2 show that in Examples 5 to 8, the amount of wax deposition at a temperature -6°C lower than the wax deposition point is greater than 0.0 mass% and not more than 1.9 mass%, which means that wax deposition can be continuously suppressed even when the temperature drops below the wax deposition point.

[0101] Tables 6-1 and 6-2 show that, compared to the heavy oil composition A of Comparative Example 1, the heavy oil compositions A of Examples 9 to 11, which contain a total of 0.005% by mass to 0.050% by mass of linear saturated hydrocarbons having 36 carbon atoms, are able to lower the clogging point without increasing the cloud point by 3°C or more (the low-temperature fluidity improver can effectively exert its wax crystal growth inhibitory effect), and that when 0.100% by mass of linear saturated hydrocarbons having 36 carbon atoms is added to the above heavy oil composition A, the cloud point increases by 3°C or more (Comparative Example 4). Furthermore, Tables 6-1 and 6-2 show that in Examples 9 to 11, the amount of wax deposition at a temperature -6°C lower than the wax deposition point was greater than 0.0 mass% and not more than 1.9 mass%, which means that wax deposition can be continuously suppressed even when the temperature drops below the wax deposition point.

[0102] Tables 7-1 and 7-2 show that, compared to the heavy oil composition A of Comparative Example 1, the heavy oil composition A of Example 12, which contains a total of 0.005 mass% of linear saturated hydrocarbons having 40 carbon atoms, can lower the plugging point without increasing the cloud point by 3°C or more (the low-temperature fluidity improver can effectively exert its effect of inhibiting the growth of wax crystals), and that when more than 0.050 mass% of linear saturated hydrocarbons having 40 carbon atoms are added to the above heavy oil composition A, they cannot be dissolved (Comparative Examples 5 to 7). Furthermore, Tables 7-1 and 7-2 show that in Example 12, the amount of wax deposition at a temperature -6°C lower than the wax deposition point was greater than 0.0 mass% and not more than 1.9 mass%, which means that wax deposition can be continuously suppressed even when the temperature drops below the wax deposition point.

[0103] These results show that when the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is at least 0.005 (mass%), the low-temperature fluidity improver can preferably exhibit the effect of inhibiting the growth of wax crystals.

[0104] Furthermore, the above results show that the heavy oil composition A can contain up to 0.100 mass% of linear saturated hydrocarbons having 30 to 34 carbon atoms, up to a total of 0.050 mass% of linear saturated hydrocarbons having 35 to 36 carbon atoms, and up to a total of 0.005 mass% of linear saturated hydrocarbons having 37 to 40 carbon atoms; in other words, by satisfying the above formula (I), it can be considered that the low-temperature fluidity improver can preferably exhibit the wax crystal growth inhibitory effect.

[0105] Furthermore, Tables 4-3, 5-3, 6-3 and 7-3 show that the A heavy oil compositions obtained in Examples 1 to 12 fully satisfy the various properties required of A heavy oil compositions.

[0106] (Comparative Example 8) An ethylene vinyl acetate copolymer-based cold pour point improver was mixed into the above-mentioned mixing base material B to a concentration of 200 ppm by mass, thereby obtaining a heavy oil composition A. The composition and physical properties of the resulting heavy oil composition A are shown in Tables 8-1 to 8-3.

[0107] Example 13 A linear saturated hydrocarbon reagent having 30 carbon atoms (n-C30) was mixed into the above-mentioned mixing base material B to a content of 0.010 mass%, and an ethylene vinyl acetate copolymer-based cold pour point improver was mixed in to a concentration of 200 mass ppm, thereby obtaining a heavy oil composition A. The composition and physical properties of the resulting heavy oil composition A are shown in Tables 8-1 to 8-3.

[0108] Example 14 A linear saturated hydrocarbon reagent having 36 carbon atoms (n-C36) was mixed into the above-mentioned mixing base material B to a content of 0.010 mass%, and an ethylene vinyl acetate copolymer-based cold pour point improver was mixed in to a concentration of 200 mass ppm, thereby obtaining a heavy oil composition A. The composition and physical properties of the resulting heavy oil composition A are shown in Tables 8-1 to 8-3. In Tables 8-1 to 8-3, the compositions and physical properties of Comparative Example 1, Example 2, and Example 6 are also listed for comparison.

[0109] [Table 8-1]

[0110] [Table 8-2]

[0111] [Table 8-3]

[0112] Tables 8-1 and 8-2 show that, compared to the heavy oil composition A of Comparative Example 8, the heavy oil composition A of Example 13, which contains a total of 0.010 mass% of linear saturated hydrocarbons with a carbon number of 30, and the heavy oil composition A of Example 14, which contains a total of 0.010 mass% of linear saturated hydrocarbons with a carbon number of 36, can lower the clogging point without increasing the cloud point by 3°C or more (the low-temperature fluidity improver can effectively exhibit the wax crystal growth inhibitory effect). As shown in Tables 8-1 and 8-2, even when the mixing base material is different, the low-temperature fluidity improver can preferably exert its wax crystal growth inhibitory effect as long as the total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005 mass% or more and the above formula (I) is satisfied. [Industrial Applicability]

[0113] According to the present invention, it is possible to provide an A fuel oil composition that can easily suppress filter clogging due to wax crystal growth, while reducing the amount of cold flow improver used and without increasing production costs, even when the composition contains a lighter middle distillate base stock than conventional ones, and it is also possible to provide a method for producing an A fuel oil composition.

Claims

1. The oil composition comprises a mixed base material having a total content of linear saturated hydrocarbons having 29 or more carbon atoms of 0.020% by mass or less, including a middle distillate base material and a carbon residue adjuster, a linear saturated hydrocarbon imparting base material containing linear saturated hydrocarbons having 30 to 40 carbon atoms, and a low-temperature fluidity improver; The middle distillate base stock is one or more selected from the group consisting of straight-run kerosene obtained from an atmospheric distillation unit, desulfurized straight-run kerosene, straight-run light diesel oil obtained from an atmospheric distillation unit, desulfurized straight-run light diesel oil, light cycle oil obtained from a fluid catalytic cracking unit, and direct desulfurized diesel oil obtained from a direct desulfurization unit; The content of the middle distillate base stock in the mixed base stock is 98.0 to 99.9% by volume, and The content of the mixed base material is 99.000 to 99.975% by mass, The total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005% by mass or more, The linear saturated hydrocarbon having 30 to 40 carbon atoms is represented by the following formula (I): [Equation 1] (where nC(i) means the content (mass%) of linear saturated hydrocarbons having a carbon number of i.) The heavy oil composition A is characterized by containing the above components so as to satisfy the above.

2. 2. The fuel oil composition according to claim 1, wherein the amount of wax precipitated at a temperature −6° C. lower than the wax precipitation point is more than 0.0 mass % and not more than 1.9 mass %.

3. A method for producing an A heavy oil composition, comprising: When a mixed base material containing a middle distillate base material and a carbon residue adjuster and having a total content of linear saturated hydrocarbons having 29 or more carbon atoms of 0.020 mass% or less, a linear saturated hydrocarbon-imparting base material containing linear saturated hydrocarbons having 30 to 40 carbon atoms, and a low-temperature fluidity improver are mixed, As the middle distillate base stock, one or more selected from straight-run kerosene obtained from an atmospheric distillation unit, desulfurized straight-run kerosene, straight-run light diesel oil obtained from an atmospheric distillation unit, desulfurized straight-run light diesel oil, light cycle oil obtained from a fluid catalytic cracking unit, and direct desulfurized diesel oil obtained from a direct desulfurization unit are selected; The content of the middle distillate base material in the mixed base material is 98.0 to 99.9% by volume, In the obtained heavy oil composition A, The content of the mixed base material is 99.000 to 99.975% by mass, The total content of linear saturated hydrocarbons having 30 to 40 carbon atoms is 0.005% by mass or more, The linear saturated hydrocarbon having 30 to 40 carbon atoms is represented by the following formula (I): [Equation 2] (where nC(i) means the content (mass%) of linear saturated hydrocarbons having a carbon number of i.) Mix to satisfy A method for producing an A heavy oil composition, comprising:

4. 4. The method for producing an A heavy oil composition according to claim 3, wherein the amount of wax precipitated in the obtained A heavy oil composition at a temperature −6° C. lower than the wax precipitation point is more than 0.0 mass % and not more than 1.9 mass %.

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