JP6128839B2 - Light oil fuel composition - Google Patents

Description

  The present invention relates to a light oil fuel composition used for diesel engines and the like, particularly to a light oil fuel composition that satisfies the requirements defined as No. 3 in JIS K 2204 “Diesel”.

  In light oil fuel compositions used for diesel engines and the like, low temperature performance is adjusted by using cloud points, pour points, and the like as an index in consideration of use in cold regions and winter seasons. And many methods for obtaining desired low-temperature fluidity have been proposed.

  For example, in Japanese Patent Application Laid-Open No. 2008-1111082, the weight ratio of the total content of linear paraffins having 15 to 18 carbon atoms to the total content of linear paraffins having 10 to 14 carbon atoms is 0.5 to 1.5. In addition, the weight ratio of the total content of linear paraffins having 15 to 18 carbon atoms to the total content of linear paraffins having 19 to 25 carbon atoms is set to 0.5 to 1.5. A technique for reducing the amount of chain paraffin and enhancing the effect of the additive used for improving the low temperature fluidity is disclosed.

  Japanese Patent Application Laid-Open No. 2005-220330 discloses a linearity obtained by determining the slow cooling cloud point (X) from −30.0 to −15.0 ° C. and the normal paraffin content of 18 to 25 carbon atoms in the light oil composition. Normal paraffin wherein the slope (Y) of the regression line is 0.18 or less, the index (Z) represented by the predetermined formula with X and Y as variables is 1.5 or less, and the carbon number in the composition is 18 or more. By reducing the sulfur content to 3.4 mass% or less, there is a technique that satisfies the practical performance and the exhaust gas purification ability without causing filter clogging at a low temperature while suppressing the sulfur content to 50 mass ppm or less. It is disclosed.

JP 2008-111082 A JP 2005-220330 A

  In recent years, with changes in the social situation, the characteristics of light oil fuel compositions and the points to be considered in the manufacturing method have also changed. Specifically, the content of sulfur and the increase in the mixing ratio of cracked light oil to the light oil desulfurization equipment accompanying the decrease in demand for heavy oil can be mentioned. And with these environmental changes and changes in the demand structure of fuel oil, there are cases where conventional technology cannot be used to maintain the low temperature performance of diesel oil. The additive used for improving the low temperature fluidity (low temperature fluidity improver: CFI) may not provide a sufficient effect. Therefore, a new index is required according to environmental changes.

  One of the reasons why the conventional technology cannot be used for maintaining the low temperature performance of light oil is that most of the technology pays attention to the properties and precipitation amount of normal paraffin (wax). On the other hand, in order to improve the low temperature fluidity of the light oil fuel composition while sufficiently responding to changes in the social situation, the present inventor, along with a decrease in the sulfur content and an increase in the mixing ratio of cracked light oil, In addition to the properties and precipitation amount of wax, substances that contribute to the dissolution amount of wax precipitated at low temperatures, that is, aromatic compounds that are abundant in cracked gas oil, and are produced by hydrogenating aromatic compounds in a desulfurization unit It has been found that it is also necessary to pay attention to the composition and content of naphthene.

  The present invention provides a light oil fuel composition having sufficient low-temperature fluidity for vehicle fuel even in severe cold areas, while responding to a decrease in sulfur content and an increase in the mixing ratio of cracked light oil. The purpose is to do.

This onset Ming, pour point -20.0 ° C. or less, 90% distillation temperature of 330 ° C. or less, a flash point of 45 ° C. or higher, normal paraffin content of 19 to 23 carbon atoms or less 6.5 mass%, 2 rings The cycloparaffins are 9.1 mass% or more and 15.0 mass% or less , the aromatic content is 18.0 vol% or more and 30.0 vol% or less, the alkylbenzenes are 17.0 mass% or more , and the sulfur content is 10 massppm or less. A diesel fuel composition containing a fluidity improver.

  In the present invention, the EV-based low temperature fluidity improver is an additive for improving low temperature fluidity for a fuel mainly composed of an ethylene-unsaturated ester copolymer. A typical example is an ethylene-vinyl acetate copolymer (EVA). For example, a low temperature fluidity improver in which the methyl group of the acetate group of the EVA low temperature fluidity improver is substituted with an alkyl group having an appropriate carbon number is also effective. The added amount of the EV low temperature fluidity improver is preferably 50 to 500 massppm, and particularly preferably 100 to 500 massppm. If the amount added exceeds 500 massppm, the filter may be clogged. Further, as a low-temperature fluidity improver, generally, a surfactant system, a wax dispersant system, and the like are widely used. However, the base material constituting the light oil fuel composition of the present invention satisfies predetermined properties. In this case, the low temperature fluidity can be remarkably improved by using an EV type low temperature fluidity improver.

  In the present invention, cycloparaffins mean alicyclic hydrocarbons, including monocyclic, bicyclic and tricyclic, and those substituted with an alkyl group. Examples of the one ring include alkylcyclohexane such as tetraethylcyclohexane, and examples of the two ring include alkyldecalin such as ethylpropyldecalin. Examples of the three ring include alkyl perhydrofluorene such as diethylperhydrofluorene. Examples include, but are not limited to, hydrofluorene and alkyl perhydroanthracene such as ethyl perhydroanthracene.

In the present invention, the alkylbenzenes are those in which the aromatic ring is substituted with an alkyl group, and pentamethylbenzene, hexamethylbenzene, 1-ethyl-3-methylbenzene, trimethylbenzene derivatives, 1-ethyl Examples include, but are not limited to, -3,5-dimethylbenzene, 1-methyl-4-propylbenzene, 2-methyl-1,3-dimethylbenzene.
In the present invention, the aromatic component is a cyclic unsaturated organic compound, and hydrogen in one ring (benzene), two rings (naphthalene), three rings (anthracene), and aromatic rings is substituted with an organic compound such as paraffin. And compounds containing both an aromatic ring and a naphthene ring, such as naphthenebenzene.

  According to the present invention, in particular, by setting the bicyclic cycloparaffins to a predetermined content, and further using an EV-based low temperature fluidity improver, the sulfur content can be reduced and the mixing ratio of cracked light oil can be increased. Accordingly, it is possible to provide a light oil fuel composition having sufficient low-temperature fluidity for a vehicle fuel.

  It is well known that the normal paraffin content called a wax component greatly affects the low-temperature fluidity of the light oil fuel composition. Among the normal paraffins, the present inventor is a fuel supply system for diesel engines. Focusing on the filter that is deposited on the filter and causes clogging, the composition was analyzed. The result of the analysis is shown in FIG. In collecting the wax to be analyzed, first, the light oil fuel composition is placed in a thermostatic bath at 25 ° C., and rapidly cooled to a temperature 5.0 ° C. higher than the cloud point measured in advance for the light oil fuel composition. The solution was gradually cooled to -12.0 ° C at 1.0 ° C / h. And the precipitated wax was extract | collected using the suction filtration apparatus. Glass fiber filter paper (GE Healthcare Japan GF series: GF / A: 1.6 μm) was used for wax collection. Further, the light oil fuel composition remaining in the collected wax was removed using 2-butanone. The obtained wax content was analyzed by gas chromatography.

  As shown in FIG. 1, normal paraffin in light oil is widely distributed from 6 to 25 carbon atoms and has a peak at 10 to 15 carbon atoms. On the other hand, the carbon number distribution of the wax causing clogging mainly occupies 19 to 23, and the present inventor adjusts the normal paraffin content of 19 to 23 carbons based on this analysis result. It was found that good low temperature fluidity can be secured. Moreover, when the relationship between the normal paraffin having 19 to 23 carbon atoms and the composition and low-temperature fluidity of other light oil fuel compositions was examined, not only the normal paraffin content having 19 to 23 carbon atoms but also aromatic components and alkylbenzenes and It was found that the content of bicyclic cycloparaffins also affects the low temperature fluidity. And by combining a specific amount of wax with a base material that has been appropriately controlled, especially the content of bicyclic cycloparaffins, and a specific additive, even under the circumstances of the current social situation, It has been found that low temperature fluidity can be secured. The present invention is based on these new findings by the present inventors.

It is a graph which shows carbon number distribution of normal paraffin in wax in comparison with carbon number distribution of normal paraffin in light oil fuel composition.

  The light oil fuel composition of the present invention comprises one or more kerosene bases and one or two or more light oil bases so as to have a specific property defined by the finally obtained light oil fuel composition. Can be prepared by mixing.

  As the kerosene base material, for example, a kerosene fraction obtained by atmospheric distillation of crude oil and desulfurized kerosene obtained by desulfurization thereof can be used. A kerosene base material having a sulfur content of 10 mass ppm or less obtained by mixing and desulfurizing kerosene fraction obtained from an atmospheric distillation apparatus and cracked kerosene at an appropriate ratio can also be used. Note that cracked kerosene refers to kerosene fractions distilled from heavy oil upgrading processes such as kerosene fractions obtained from fluid catalytic cracking equipment and kerosene fractions obtained from thermal cracking equipment. Therefore, it is preferable to make the mixing ratio as high as possible.

  Moreover, as a light oil base material, for example, a light oil fraction obtained by atmospheric distillation of crude oil and a desulfurized light oil obtained by desulfurizing it can be used. A light oil fuel composition having a sulfur content of 10 mass ppm or less obtained by mixing and desulfurizing a light oil fraction obtained from an atmospheric distillation apparatus and cracked light oil at an appropriate ratio can also be used. Note that cracked light oil means light oil distilled from an upgrade process of heavy oil such as direct degasified light oil obtained from a direct desulfurizer, degasified light oil obtained from an indirect desulfurizer, or light cycle oil obtained from a fluid catalytic cracker. The fraction is a fraction, and it is preferable to make the mixing ratio as high as possible in accordance with recent social demands.

  Furthermore, light oils obtained by hydrotreating them for improving the hue can also be used. That is, the raw material type and ratio of the desulfurizer are adjusted so that normal paraffins, aromatics, bicyclic cycloparaffins, and alkylbenzenes having 19 to 23 carbon atoms in the desulfurized diesel oil after the desulfurizer treatment are in appropriate amounts Those obtained by adjusting various desulfurization conditions so that these substances that disappear and are generated by the reaction in the desulfurization apparatus are within the proper range in the final product can be used.

  Furthermore, distillate from the oil refining secondary equipment regardless of whether or not the desulfurized diesel oil satisfies or does not satisfy the proper amount of normal paraffins, aromatics, bicyclic cycloparaffins and alkylbenzenes having 19 to 23 carbon atoms. It is also possible to use kerosene / light oil equivalent oil, hydrocracked kerosene / light oil, Fischer-Tropsch synthetic oil or the like as a base material to satisfy the above-mentioned appropriate amount.

  The normal paraffin content having 19 to 23 carbon atoms needs to be 6.5 mass% or less. Exceeding this is not preferable because the low-temperature fluidity is deteriorated such that the filter in the fuel supply path to the diesel engine is likely to be clogged at the time of starting at a low temperature. 6.0 mass% or less is preferable, 5.5 mass% or less is more preferable, 5.2 mass% or less is further preferable, and 5.0 mass% or less is particularly preferable. However, the normal paraffin content having 19 to 23 carbon atoms is preferably as small as possible from the viewpoint of improving low-temperature fluidity, but can be set to, for example, 3.0 mass% or more from the viewpoint of the cetane index.

  Although content in particular of cycloparaffins is not restrict | limited, For example, it is 20.0 mass% or more, Preferably it is 25.0 mass% or more, Most preferably, it can be 30.0 mass% or more. Further, the content of the monocyclic cycloparaffins is not particularly limited, but may be, for example, 15.0 mass% or more, preferably 18.0 mass% or more. Bicyclic cycloparaffins are 9.1 mass% or more, preferably 9.3 mass% or more, more preferably 9.5 mass% or more, and particularly preferably 9.7 mass% or more. The content of tricyclic cycloparaffins is not particularly limited, but may be, for example, 0.1 mass% or more, preferably 0.5 mass% or more. The higher the content of these cycloparaffins, the higher the effect of the EV additive and the improvement of the low temperature fluidity. However, if the content is too large, the hydrogenation reaction of aromatics will be promoted and the refining cost will increase. Since there is a case where the sealant of the supply system is shrunk to cause fuel bleeding, the content of cycloparaffins is 43.0 mass% or less, and the content of monocyclic cycloparaffins is 25.0 mass% or less. The content of bisphenols can be made 15.0 mass% or less, and the content of tricyclic cycloparaffins can be made 3.0 mass% or less. For bicyclic cycloparaffins, the low temperature fluidity can be improved by setting the value to a certain value or more.

The aromatic content is 18.0 vol% or more, preferably 19.0 vol% or more, more preferably 20.0 vol% or more, still more preferably 21.0 vol% or more, and particularly preferably 22.0 vol% or more. However, aromatic content is too much, the cetane number is lowered and particulate matter in automotive exhaust gas may cause problems such as certain order or less 30.0Vol% increase.
The 1-ring aromatic content is preferably 17.0 vol% or more, more preferably 18.0 vol% or more, and further preferably 20.0 vol% or more. However, if the aromatic content is too large, the cetane number may decrease, and problems such as an increase in particulate matter in automobile exhaust gas may occur, so 27.0 vol% or less is preferable.
The bicyclic aromatic content is preferably 1.0 vol% or more, and more preferably 1.5 vol% or more. However, if the aromatic content is too large, the cetane number is lowered, and problems such as an increase in particulate matter in automobile exhaust gas may occur, so 2.5 vol% or less is preferable.

Alkylbenzenes are 17.0 mass% or more , more preferably 18.0 mass% or more, further preferably 20.0 mass% or more, and particularly preferably 21.0 mass% or more. It is preferable to adjust the alkylbenzene content to the above range because sufficient low-temperature fluidity can be obtained for vehicle fuel. However, if the alkylbenzene is too much, the cetane number is lowered, and problems such as an increase in particulate matter in the automobile exhaust gas may occur, so 25.0 mass% or less is preferable.

  Examples of naphthenebenzenes include indane, alkyl-substituted indane, tetralin, and alkyl-substituted tetralin. Although content in particular of 1 ring naphthenebenzene is not restrict | limited, For example, it is 10.0 mass% or more, Preferably it is 11.0 mass% or more, More preferably, it can be 12.0 mass% or more. However, if the amount of naphthene benzenes is too large, the cetane number may decrease, and problems such as an increase in particulate matter in automobile exhaust gas may be caused. Therefore, the content of monocyclic naphthene benzenes is, for example, 15.0 mass. % Or less The content of bicyclic naphthenebenzenes can be, for example, 2.5 mass% or less.

The sulfur content needs to satisfy the JIS K 2204 standard determined in consideration of the influence on the environment, that is, 10 mass ppm or less.
The flash point should be 45 ° C or higher for safe handling.

  The light oil fuel composition of the present invention can greatly improve the low temperature fluidity of the substrate by adding an EV-based low temperature fluidity improver. As the EV system low temperature fluidity improver, for example, Carriol KA-701 (manufactured by Sanyo Chemical Industries, Ltd.) and R570 (manufactured by Infinium Japan Co., Ltd.) are suitable. If necessary, other additives such as a lubricity improver may be added to prevent wear of antioxidants, fuel supply pump parts, and the like.

Diesel fuel composition of the present invention, the density is preferably from 0.830 g / cm ³ or less in order to reduce particulate matter in automotive exhaust, 0.825 g / cm ³ but less is more preferable, from the viewpoint of fuel efficiency 0 802 g / cm ³ or more is preferable. Kinematic viscosity @ 30 ° C. is preferably at least 1.7 mm ² / s from the viewpoint of preventing the pump wear, more preferably at least 2.0 mm ² / s, more preferably more than 2.5 mm ² / s. Since the particulate matter in the exhaust gas increases, 4.0 mm ² / s or less is preferable. The cetane index is preferably 45.0 or more, more preferably 50.0 or more, from the viewpoint of startability at low temperatures.

From the viewpoint of improving the low temperature fluidity of the light oil fuel composition of the present invention, the 10% distillation temperature is preferably 200 ° C. or lower, more preferably 190 ° C. or lower, and further preferably 185 ° C. or lower. If the 10% distillation temperature is too low, the flash point becomes low, so 170 ° C or higher is preferable. When the 50% distillation temperature increases, the particulate matter in the exhaust gas increases. Therefore, the temperature is preferably 250 ° C or lower, more preferably 245 ° C or lower, and further preferably 240 ° C or lower. If the 50% distillation temperature is too low, the cetane index decreases and the startability deteriorates, so 210 ° C. or higher is preferable. The 90% distillation temperature is 330 ° C. or lower and preferably 325 ° C. or lower because the low temperature fluidity is good. If the 90% distillation temperature is too low, the fuel efficiency is deteriorated, so 300 ° C. or higher is preferable.
The pour point can be set to −20.0 ° C. or lower, particularly −25.0 ° C. or lower, and further −32.5 ° C. or lower in consideration of low temperature fluidity.
If the cloud point is too high, filter clogging due to wax that precipitates at low temperatures is likely to occur, so it is preferably −2 ° C. or lower, more preferably −5 ° C. or lower. If it is too low, the purification cost will increase, so -15 ° C or higher is preferred.
In the present invention, by adopting the configuration as described above, it is possible to obtain high low-temperature fluidity that can be tolerated even in a climate or usage environment in a cold region. For example, the clogging point can be set to −14 ° C. or lower, particularly −17 ° C. or lower.

"Example 1"
A straight-run gas oil fraction having a boiling range of 181 to 371 ° C is 85 vol%, a light cycle oil having a boiling range of 145 to 372 ° C distilled from a fluid catalytic cracker is 10 vol%, and a distillate from an indirect desulfurizer having a boiling range of 170 to 365 ° C. While being discharged, the deoiled oil is 5 vol% of the mixed oil, and a commercially available desulfurization catalyst is used, and the sulfur content becomes 10 massppm or less under the conditions of a liquid space velocity of 1.0 h ⁻¹ , a hydrogen partial pressure of 5 MPa, and a hydrogen oil ratio of 150 NL / L. Gas oil obtained by desulfurization until the boiling point range of 150 ° C. to 260 ° C. is obtained by using a commercially available desulfurization catalyst, liquid space velocity 2.9 h ⁻¹ , hydrogen partial pressure 3.4 MPa, hydrogen oil ratio It is mixed with kerosene obtained by desulfurization treatment until the sulfur content becomes 10 massppm or less under the condition of 120 NL / L, and an EV-based low temperature fluidity improver (CFI1) described later is added to 200 mass. A diesel fuel composition with sppm added.

"Example 2"
Using a commercially available desulfurization catalyst, 90% by volume of a straight-run gas oil fraction having a boiling range of 181 to 362 ° C. and 10% by volume of light cycle oil having a boiling range of 145 to 374 ° C. distilled from a fluid catalytic cracking unit is used as a liquid space. To a light oil obtained by desulfurization treatment under conditions of a speed of 1.5 h ⁻¹ , a hydrogen partial pressure of 4 MPa, and a hydrogen oil ratio of 150 NL / L until the sulfur content becomes 10 massppm or less, a straight kerosene lamp having a boiling point range of 150 ° C. to 260 ° C. Kerosene obtained by desulfurization treatment using a commercially available desulfurization catalyst, with a liquid space velocity of 2.9 h ⁻¹ , a hydrogen partial pressure of 3.4 MPa, and a hydrogen oil ratio of 120 NL / L until the sulfur content is 10 massppm or less. A light oil fuel composition to which CFI1 is added at 200 mass ppm.

“Comparative Example 1”
Using a commercially available desulfurization catalyst, a liquid space is obtained by mixing 98 vol% of a straight-run gas oil fraction having a boiling point range of 181 to 362 ° C and 2 vol% of a light cycle oil having a boiling range of 145 to 374 ° C distilled from a fluid catalytic cracker. To a light oil obtained by desulfurization treatment under conditions of a speed of 1.5 h ⁻¹ , a hydrogen partial pressure of 4 MPa, and a hydrogen oil ratio of 150 NL / L until the sulfur content becomes 10 massppm or less, a straight kerosene lamp having a boiling point range of 150 ° C. to 260 ° C. Kerosene obtained by desulfurization treatment using a commercially available desulfurization catalyst, with a liquid space velocity of 2.9 h ⁻¹ , a hydrogen partial pressure of 3.4 MPa, and a hydrogen oil ratio of 120 NL / L until the sulfur content is 10 massppm or less. A light oil fuel composition to which CFI1 is added at 200 mass ppm.

“Comparative Example 2”
Using a commercially available desulfurization catalyst, a liquid space is obtained by mixing 95 vol% of a straight-run gas oil fraction having a boiling point range of 181 to 376 ° C and 5 vol% of a light cycle oil having a boiling range of 145 to 372 ° C distilled from a fluid catalytic cracker. To a light oil obtained by desulfurization until the sulfur content becomes 10 massppm or less under the conditions of a speed of 1.0 h ⁻¹ , a hydrogen partial pressure of 5 MPa, and a hydrogen oil ratio of 150 NL / L, a straight-run kerosene lamp having a boiling range of 150 ° C. to 260 ° C. Kerosene obtained by desulfurization treatment using a commercially available desulfurization catalyst, with a liquid space velocity of 2.9 h ⁻¹ , a hydrogen partial pressure of 3.4 MPa, and a hydrogen oil ratio of 120 NL / L until the sulfur content is 10 massppm or less. A light oil fuel composition to which CFI1 is added at 200 mass ppm.

“Comparative Example 3”
The same light oil fuel composition as in Example 1 except that the EV type low temperature fluidity improver of Example 1 was changed to a surfactant type low temperature fluidity improver (CFI2) described later.

“Comparative Example 4”
The same diesel fuel composition as in Example 1, except that the EV low temperature fluidity improver of Example 1 was changed to a WAX dispersant low temperature fluidity improver (CFI3) described later.

"CFI1"
R570 (manufactured by Infinium)
"CFI2"
FPD-779N (manufactured by Toho Chemical Co., Ltd.)
"CFI3"
Carriol FD-391 (manufactured by Sanyo Chemical Industries)

In addition, each property shown in Table 1 is shown below.
“Density (@ 15 ℃)”
Density at 15 ° C. measured by JIS K 2249 “Crude oil and petroleum products—Density test method and density / mass / volume conversion table”.
"Kinematic viscosity (@ 30 ° C)"
Kinematic viscosity at 30 ° C. measured by JIS K 2283 “Crude oil and petroleum products—Kinematic viscosity test method and viscosity index calculation method”.
"Sulfur"
Sulfur content obtained by JIS K 2541-2 "Crude oil and petroleum products-Sulfur content test method Part 2: Micro coulometric titration method".

"Flash point"
Flash point obtained by JIS K 2265-3 "How to determine flash point-Part 3: Penschramtens sealing method".
“Residual carbon content of 10% residual oil”
Residual carbon content of 10% residual oil obtained by JIS K 2270 “Crude oil and petroleum products—Test method for residual carbon content”.
"Cetane index"
It means a cetane index measured according to JIS K 2280 “Petroleum products—fuel oil—octane number and cetane number test method and cetane index calculation method 8. Method for calculating cetane index using 4-variable equation”.

"Distillation properties"
Distillation properties obtained by JIS K 2254 "Petroleum products-Distillation test method".
"Total saturation"
Paraffin content measured by JPI-5S-49-97 "Petroleum products-Hydrocarbon type test method-High performance liquid chromatograph method".
`` Aromatic content total ''
Sum of 1-ring aromatics, 2-rings aromatics and 3 or more-rings aromatic hydrocarbons measured by JPI-5S-49-97 "Petroleum products-Hydrocarbon type test method-High performance liquid chromatograph method" .

"C19-23 normal paraffin content"
Using a gas chromatographic method in accordance with ASTM D 2887 “Standard Test Method for Boiling Range Distribution of Petroleum Fraction by Gas Chromatography”, the carbon content obtained from each carbon content was obtained from the carbon content obtained by carbon chromatography. That is, the retention time was examined using a mixture of normal paraffins having different carbon numbers as a standard, and the content of normal paraffins was determined from the peak area values of normal paraffins. The sum of the chromatogram area values of the peaks between the normal paraffin peaks was determined as the content of isoparaffin having N carbon atoms. Since the gas chromatography detector is a flame ionization detector (FID), the measurement sensitivity is proportional to the carbon number of paraffin. Therefore, taking this sensitivity into consideration, the content molar ratio was determined from the area value, and finally each mass ratio was determined.
The type of column in the gas chromatographic method is HP5 (length: 30 m, inner diameter: 0.32 mm, liquid layer thickness: 0.25 μm), and each analysis condition is as follows.
Column tank temperature rising condition: 35 ° C. (5 minutes) → 10 ° C./minute (temperature rising) → 320 ° C. (11.5 minutes)
Sample vaporization chamber condition: constant 320 ° C. split ratio 150: 1
Detector section: 320 ° C

"Pour point"
Pour point obtained by JIS K 2269 “Pour point of crude oil and petroleum products and cloud point test method of petroleum products”.
"Cloud point"
Cloud point obtained by JIS K 2269 “Pour point of crude oil and petroleum products and cloud point test method of petroleum products”.
"Clogging point"
A clogging point obtained by JIS K 2288 "Petroleum products-light oil-clogging point test method".

"Cycloparaffins, naphthenebenzenes, alkylbenzenes"
For the analysis of cycloparaffins, naphthenebenzenes, and alkylbenzenes, a GC system consisting of a gas chromatography with HP-6890N type FI-MS detector manufactured by Agilent Technology and a JMS-T100GC time-of-flight mass spectrometer manufactured by JEOL is used. Then, a correction graph was prepared with the analytical strength of the normal paraffin standard sample, and the measured data was corrected with the correction graph, and then the respective strength ratios were determined with the overall strength being 100 mass%.
The column type in the gas chromatogram method is DB-5 (length: 30 m, inner diameter: 0.25 mm, liquid layer thickness: 0.25 μm), and each analysis condition is as follows.
Column tank temperature rising condition: 30 ° C. (5 minutes) → 20 ° C./minute (temperature rising) → 300 ° C. (27 minutes)
Sample vaporizing chamber conditions: 300 ° C constant Splitless detector: 250 ° C
Solvent: Hexane Solvent waiting time: 6 minutes Collection range: 25.00 m / z to 600.00 m / z

  In Table 1, from the comparison between Example 1 and Comparative Examples 3 and 4, even if they have the same light oil properties, if the additives are different, the effect of improving the low temperature fluidity (the eye that is particularly important in practical performance) It can be seen that there is a difference in the clogging point). Further, from the comparison between Examples 1 and 2 and Comparative Example 2, even when an EV-based low-temperature fluidity improver is used, the content of normal paraffins having 19 to 23 carbon atoms is high, and bicyclic cycloparaffins It can be seen that when the content is small, the effect of improving the low temperature fluidity is low. Furthermore, from the comparison between Examples 1 and 2 and Comparative Example 1, even when the EV low temperature fluidity improver is used and the content of normal paraffins having 19 to 23 carbon atoms is the same, the inclusion of bicyclic cycloparaffins When the amount is small, it can be seen that the clogging point does not become -14 ° C. or lower and the low-temperature flow performance is poor. From these results, in particular, the content of normal paraffins having 19 to 23 carbon atoms and bicyclic cycloparaffins are set to a predetermined content, and further, an EV-based low temperature fluidity improver is used. It turns out that sufficient low-temperature fluidity is obtained for fuel.

Claims (1)

The pour point is −20.0 ° C. or less, the 90% distillation temperature is 330 ° C. or less, the flash point is 45 ° C. or more, and the normal paraffin content of 19 to 23 carbon atoms is 6.5 mass% or less. 0.1 mass% or more and 15.0 mass% or less , aromatic content is 18.0 vol% or more and 30.0 vol% or less, alkylbenzenes are 17.0 mass% or more , and sulfur content is 10 massppm or less. A gas oil fuel composition comprising: