JP2006176743A - Unleaded gasoline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide unleaded gasoline which hardly gives vaporized gases from a fuel and is excellent in starting properties, driving properties and intake valve-cleaning properties. <P>SOLUTION: The unleaded gasoline has (1) a Reid vapor pressure of 45-65 kPa, (2) a 50% distillation temperature of 80-110°C, (3) a 70°C distillation amount of 18-40 vol%, (4) a 130°C distillation amount of 70-90 vol%, (5) an aromatic content of at most 40 vol%, (6) an olefin content of at most 30 vol%, (7) a benzene content of at most 1 vol%, (8) a sulfur content of at most 10 mass ppm, (9) a density at 15°C of 0.68-0.78 g/cm<SP>3</SP>, (10) a vapor/liquid ratio (V/L) at 60°C of 25-50, (11) a research octane number of at least 89 and less than 97, (12) a motor octane number of at least 79 and less than 85 and (13) a polycyclic aromatics index Y represented by a specific formula of at most 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to unleaded gasoline, in particular unleaded low vapor pressure gasoline, and more particularly, has a specific distillation property and a specific component composition, is environmentally friendly as an automotive fuel, and has startability, drivability, and an intake valve. This is related to unleaded low vapor pressure gasoline with excellent cleanliness.

In recent years, from the viewpoint of environmental improvement, environmental pollution due to exhaust gas from automobiles has been regarded as a problem, and various efforts have been made to reduce exhaust gas from the fuel surface. On the other hand, reduction of ozone generation, which is a factor of photochemical smog, is strongly desired.
In general, it is said that NOx and HC affect ozone generation. To reduce these, it is considered effective to reduce exhaust gas from automobiles or evaporated gas from fuel. In order to reduce the evaporated gas from the fuel, it is considered important to lower the vapor pressure of the fuel.
Conventionally, gasoline having a low vapor pressure has a hydrocarbon content of 4 carbon atoms, an olefin content, etc. (see, for example, Patent Document 1), or a 10% distillation temperature or carbon number. Those that specify a hydrocarbon content of 4 or less, a hydrocarbon content of 6 or less carbon atoms (for example, see Patent Document 2), or those that specify a distillation amount up to 70 ° C. (for example, Patent Document 3 and Patent Document 4) are known.
Usually, reducing the vapor pressure of fuel has an effect on reducing the evaporated gas from the fuel, but it may adversely affect the startability and drivability of the automobile, and without reducing these performances. There is a demand for a fuel that can reduce evaporative gas.

Japanese Patent Laid-Open No. 11-236580 JP 2000-248287 A Japanese Patent Laid-Open No. 2004-124055 Japanese Patent Laid-Open No. 2004-124056

An object of the present invention is to provide unleaded gasoline that has a small amount of evaporated gas from fuel and is excellent in startability, operability, and intake valve cleanliness.

As a result of intensive research from the above viewpoints, the present inventors have found that the object can be achieved with unleaded gasoline having a specific component composition and a specific distillation property, and to complete the present invention. It came.
That is, the present invention provides the following unleaded gasoline.

(1) Unleaded gasoline characterized by satisfying the following properties.
1) Reed vapor pressure (RVP) 45 ~ 65kPa
2) 50% distillation temperature (T50) is 80 ~ 110 ℃
3) Distillation at 70 ℃ (E70) is 18-40% by volume
4) 130 ℃ distillate (E130) is 70-90 vol%
5) Aromatic content 40% or less
6) Olefin content is less than 30% by volume
7) Benzene content is less than 1% by volume
8) Sulfur content is 10 mass ppm or less
9) Density at 15 ° C is 0.68 ~ 0.78g / cm ³
10) Gas-liquid ratio (V / L) at 60 ℃ is 25-50
11) Research octane number (RON) is 89 or more and less than 97
12) Motor method octane number (MON) is 79 or more and less than 85
13) Polycyclic aromatic index represented by the following formula is 6 or less
Y = (0.002 × 3R-A) + (0.01 × 4R-A) + (0.07 × 5R-A) + (0.2 × 6R + -A)
(In the formula, 3R-A represents a 3-ring aromatic content, 4R-A represents a 4-ring aromatic content, 5R-A represents a 5-ring aromatic content, and 6R + -A represents an aromatic content of 6 or more rings. In addition, all of the aromatic content indicate mass ppm in terms of content in gasoline.)

(2) 10 debenzene contact reformed gasoline with a research octane number (RON) of 93 or higher, a motor octane number (MON) of 83 or higher, a Reid vapor pressure (RVP) of 30 kPa or higher, and a boiling range of 28-200 ° C. ~ 40% by volume,
Research method octane number (RON) is 87 or more, motor method octane number (MON) is 76 or more, Reid vapor pressure (RVP) is 40 kPa or more, and boiling point range is 30 to 215 ° C.
,
Research method octane number (RON) 65 or more, motor method octane number (MON) 62 or more, Reed vapor pressure (RVP) 80kPa or more, desulfurized light naphtha with boiling point range 25-110 ° C 10-30% by volume,
The research octane number (RON) is 93 or higher, the motor octane number (MON) is 90 or higher, the Reid vapor pressure (RVP) is 40 kPa or higher, the boiling point range is 30 to 215 ° C, and the C8 fraction is 50 vol% or higher. The unleaded gasoline as described in (1) above, containing 0 to 30% by volume of a chelate.

(3) Debenzene light catalytic reforming gasoline with a research octane number (RON) of 78 or higher, motor octane number (MON) of 70 or higher, Reed vapor pressure (RVP) of 85 kPa or higher, and a boiling range of 26-100 ° C. ~ 25% by volume,
Research method octane number (RON) of 101 or higher, motor method octane number (MON) of 89 or higher, Reed vapor pressure (RVP) of 3 kPa or higher, debenzene heavy contact reformed gasoline with boiling point range of 90-210 ° C 3-20 capacity%,
Research method octane number (RON) is 87 or more, motor method octane number (MON) is 76 or more, Reid vapor pressure (RVP) is 40 kPa or more, and boiling point range is 30 to 215 ° C.
,
Research method octane number (RON) 65 or more, motor method octane number (MON) 62 or more, Reed vapor pressure (RVP) 80kPa or more, desulfurized light naphtha with boiling point range 25-110 ° C 10-30% by volume,
The research octane number (RON) is 93 or higher, the motor octane number (MON) is 90 or higher, the Reid vapor pressure (RVP) is 40 kPa or higher, the boiling point range is 30 to 215 ° C, and the C8 fraction is 50 vol% or higher. The unleaded gasoline as described in (1) above, containing 0 to 30% by volume of a chelate.

  The unleaded gasoline of the present invention has little evaporated gas from fuel and is excellent in startability and drivability, and can maintain the atmospheric environment while maintaining practical performance. In addition, the content of polycyclic aromatics with a higher number of rings is limited to a lower level in order to suppress the formation of deposits in the engine, in particular, to prevent deposits from adhering to the intake valves, and to prevent harmful emissions in the exhaust gas. The amount of ingredients is further reduced.

Hereinafter, the contents of the present invention will be described in more detail.
The lead vapor pressure (RVP) of the unleaded gasoline of the present invention is 45 to 65 kPa, preferably 50 to 65 kPa. By setting RVP to 65 kPa or less, the amount of evaporating gas can be reduced, and by setting it to 45 kPa or more, it is possible to prevent the low temperature startability and warming performance from being deteriorated. This Reid vapor pressure (RVP) is a value measured according to JIS K 2258.

  The distillation properties of the unleaded gasoline of the present invention are as follows: (a) 50% distillation temperature (T50) is 80 to 110 ° C, preferably 80 to 105 ° C, (b) 70 ° C distillation amount (E70) is 18 to 40% by volume, preferably 20 to 40% by volume, (c) The 130 ° C. distillate (E130) is 70 to 90% by volume, preferably 75 to 85% by volume. When T50, E70, and E130 are within the above ranges, it is possible to prevent a problem in starting performance, driving performance, and acceleration performance. These distillation properties are values measured according to JIS K 2254.

  The aromatic content of the unleaded gasoline of the present invention is 40% by volume or less, preferably 5 to 35% by volume. If the aromatic content is within 40% by volume, an increase in harmful components in the exhaust gas can be prevented, which is preferable. The aromatic content is a value measured in accordance with the Petroleum Institute Method JPI-5S-33-90 (gas chromatographic method).

  The olefin content of the unleaded gasoline of the present invention is 30% by volume or less, preferably 5 to 27% by volume. When the olefin content is within 30% by volume, a decrease in oxidation stability can be prevented, which is preferable. The olefin content is a value measured in accordance with the Petroleum Institute Method JPI-5S-33-90 (gas chromatographic method).

  The benzene content of the unleaded gasoline of the present invention is 1% by volume or less, preferably 0.8% by volume or less. If the benzene content is within 1% by volume, an increase in the amount of benzene emissions in the atmosphere can be prevented and environmental pollution can be reduced. The benzene content is a value measured in accordance with the Petroleum Institute method JPI-5S-33-90 (gas chromatographic method).

  The sulfur content of the unleaded gasoline of the present invention is 10 mass ppm or less, preferably 8 mass ppm or less. If the sulfur content is within 10 ppm by mass, it is preferable because the capability of the exhaust gas purification catalyst can be prevented from being lowered and NOx, CO, and THC emissions in the exhaust gas can be reduced. The sulfur content is a value measured according to JIS K 2541.

The density of the unleaded gasoline of the present invention at 15 ° C. is 0.68 to 0.78 g / cm ³ , preferably 0.69 to 0.75 g / cm ³ . When this density is 0.68 g / cm ³ or more, good fuel consumption can be ensured. In addition, by setting the density to 0.78 g / cm ³ or less, it is possible to reduce the high-density aromatic component, and it is possible to reduce the amount of aromatic emissions into the atmosphere by exhaust gas. This density is a value measured in accordance with JIS K 2249.

  The gas-liquid ratio (V / L) at 60 ° C. of the unleaded gasoline of the present invention is 25 to 50, preferably 25 to 45. When this V / L is 25 or more, good startability can be ensured. Further, it is preferable that V / L is 50 or less because there is a possibility that problems in acceleration and drivability can be reduced. The V / L is a value measured according to ASTM D 2533-93a.

  The octane number of the unleaded gasoline of the present invention is (a) a research method octane number (RON) of 89 to less than 97, preferably 89 to 95, and (b) a motor method octane number (MON) of 79 to less than 85, preferably Is 80-84. When RON is 89 or more and less than 97, it is possible to maintain high driving performance, and when RON is 79 or more and less than 85, it is possible to prevent a decrease in anti-knock property at high speed traveling, which is preferable. Note that RON and MON are values measured in accordance with JIS K 2280.

Furthermore, in the unleaded gasoline of this invention, the polycyclic aromatic index represented by a following formula is 6 or less, Preferably it is 5 or less.
Y = (0.002 × 3R-A) + (0.01 × 4R-A) + (0.07 × 5R-A) + (0.2 × 6R + -A)
(In the formula, 3R-A represents a 3-ring aromatic content, 4R-A represents a 4-ring aromatic content, 5R-A represents a 5-ring aromatic content, and 6R + -A represents an aromatic content of 6 or more rings. In addition, all of the aromatic content indicate mass ppm in terms of content in gasoline.)
The aromatic content index is an empirical formula determined from the relationship between the content of polycyclic aromatics and the amount of deposits in the engine, and increases as the number of rings increases to 3, 4, 5, 6, and so on. Show. This indicates that the increase of harmful components in the exhaust gas and the generation of deposits in the engine become higher as the polycycle increases.
In the case of unleaded gasoline, it is preferable that the aromatic content index Y is 6 or less because an increase in harmful components in the exhaust gas and an increase in the generation of deposits in the engine can be prevented. The polycyclic aromatic content is a value determined by the number of rings by the gas chromatographic method shown below, and the quantitative method is an absolute calibration curve method using typical standard samples by number of rings. . That is, a dimethylsilicon capillary column with a length of 30 m and an inner diameter of 0.25 mm is used as the column, the detector is a hydrogen ionization detector (FID), the carrier gas is helium at a flow rate of 1.3 ml / min, splitless injection, inlet temperature It is a value measured by raising the column temperature from the initial temperature of 50 ° C. to the final temperature of 350 ° C. under the conditions of 300 ° C. and detector temperature of 350 ° C.

  The production method of the unleaded gasoline of the present invention is not particularly limited, and can be produced by any method. However, as a base material, a debenzene contact reformed gasoline, a debenzene light contact obtained by fractionating it, are used. It can be suitably produced using reformed gasoline, debenzene heavy contact reformed gasoline, catalytic cracked gasoline, desulfurized light naphtha, alkylate and the like.

The debenzene contact reformed gasoline used in the lead-free gasoline of the present invention is a catalytic reforming method (Platforming method, Magnaforming method, Aromaizing method, Reniforming method, Food reforming method) of heavy straight run naphtha and the like. , Ultra-forming method, power-forming method, etc.) modified by contact treatment with a catalyst (eg, platinum carrier, rhodium and chlorine supported on an alumina carrier) in a hydrogen stream at high temperature and pressure The benzene fraction is removed from gasoline by distillation, and the properties thereof are RON 93 or more, preferably 93 to 99, MON 83 or more, preferably 83 to 89, RVP 30 kPa or more, preferably 35 to 55 kPa. And the boiling range is 28 to 200 ° C, preferably 30 to 195 ° C.
The content of debenzene contact reformed gasoline in the unleaded gasoline of the present invention is preferably 10 to 40% by volume, more preferably 15 to 40% by volume. If the content of this debenzene-catalyzed reformed gasoline is 10% by volume or more, it is possible to prevent a decrease in RON, and if it is within 40% by volume, the distillation property becomes heavier and the aromatic content increases. This is preferable.

The debenzene light catalytic reformed gasoline is a light fraction that is obtained by distilling the catalytic reformed gasoline obtained by contact treatment by the above catalytic reforming method into a light fraction, a benzene fraction, and a heavy fraction. The properties thereof are RON 78 or more, preferably 78 to 90, MON 70 or more, preferably 70 to 83, RVP 85 or more, preferably 85 to 105, boiling range 26 to 100 ° C., preferably 28-95 ° C. The debenzene heavy catalytic reformed gasoline, which is a heavy fraction, has a RON of 101 or more, preferably 101 to 110, MON of 89 or more, preferably 89 to 98, and RVP of 3 kPa or more, preferably 3 to 15 kPa. The boiling point range is 90 to 210 ° C, preferably 95 to 205 ° C.
The content of debenzene light catalytic reformed gasoline and debenzene heavy catalytic reformed gasoline in the unleaded gasoline of the present invention is preferably 3 to 25% by volume, 3 to 20% by volume, more preferably 5 to 20% by volume, respectively. %, 5-15% by volume. If this debenzene light catalytic reformed gasoline is 3% by volume or more, it is preferable to prevent the distillation property from becoming heavy, and if it is 25% by volume or less, it is preferable to prevent a decrease in density. Further, if the debenzene heavy catalytic reformed gasoline is 3% by volume or more, it is possible to prevent a decrease in RON, and if it is within 20% by volume, the distillation property becomes heavier and the aromatic content is prevented from increasing. Can be preferable.

Furthermore, the catalytic cracking gasoline used for the unleaded gasoline of the present invention is a conventionally known catalytic cracking method for separating petroleum fractions from kerosene / light oil to atmospheric residual oil, preferably heavy gas oil or vacuum gas oil. , Especially fluid catalytic cracking method (UOP method, shell two-stage method, flexi cracking method, ultra ortho flow method, texaco method, gulf method, ultra cat cracking method, ultra ortho flow method, texaco method, gulf method, ultra cat cracking Method, RCC method, HOC method, etc.) obtained by desulfurizing catalytic cracking gasoline obtained by cracking with a solid acid catalyst (for example, silica / alumina blended with zeolite) As for the properties, RON is 87 or more, preferably 88 to 92, MON is 76 or more, preferably 77 to 81, RVP is 40 kPa or more, preferably 45 to 65 kPa, and the boiling range is 30 to 215 ° C. Is 30~210 ℃.
The content of catalytically cracked gasoline in the unleaded gasoline of the present invention is preferably 10 to 70% by volume, more preferably 15 to 65% by volume. If the content of the catalytic cracking gasoline is 10% by volume or more, it is preferable to prevent a decrease in RON, and if it is within 70% by volume, it is preferable because an increase in olefin content and a decrease in oxidation stability are prevented.

Furthermore, the desulfurized light naphtha used in the unleaded gasoline of the present invention is obtained by distilling a desulfurized straight naphtha obtained by desulfurizing a straight-run naphtha obtained by atmospheric distillation of a crude oil, to obtain a light fraction and a heavy fraction. The RON is 65 or more, preferably 65 to 70, MON is 62 or more, preferably 62 to 67, RVP is 80 kPa or more, preferably 80 to 105 kPa, and the boiling range is 25. It is -110 degreeC, Preferably it is 26-105 degreeC.
The content of desulfurized light naphtha in the unleaded gasoline of the present invention is preferably 10 to 30% by volume, more preferably 10 to 25% by volume. If the content of the desulfurized light naphtha is 10% by volume or more, it is preferable to prevent the distillation property from becoming heavy, and if it is within 30% by volume, RON and density are prevented from being lowered.

The alkylate used in the lead-free gasoline of the present invention is obtained by reacting isobutane and lower olefin (butene, propylene, etc.) as raw materials in the presence of an acid catalyst (sulfuric acid, hydrogen fluoride, aluminum chloride, etc.). The RON is 93 or more, preferably 94 to 96, MON is 90 or more, preferably 91 to 94, RVP is 40 kPa or more, preferably 40 to 60 kPa, and the boiling point range is 30 to 215 ° C. Preferably it is 30-210 degreeC.
The content of alkylate in the unleaded gasoline of the present invention is preferably 0 to 30% by volume, more preferably 5 to 30% by volume. If the alkylate content is within 30% by volume, it is preferable to prevent a decrease in density and fuel consumption.

  In the unleaded gasoline of the present invention, various additives can be appropriately blended as necessary. Such additives include phenolic and amine antioxidants, metal deactivators such as thioamide compounds, surface ignition inhibitors such as organophosphorus compounds, succinimides, polyalkylamines, polyetheramines. , Detergent dispersants such as polyisobutyleneamine, friction modifiers (FM) such as long chain alkylamines, amides, imides and derivatives thereof, anti-icing agents such as polyhydric alcohols and ethers thereof, alkali metals and alkaline earths of organic acids Metal salts, auxiliary agents such as sulfates of higher alcohols, anionic surfactants, cationic surfactants, antistatic agents such as amphoteric surfactants, rust inhibitors such as alkenyl succinates, and azo dyes Known fuel additives such as colorants can be used. These can be added alone or in combination. The addition amount of these fuel additives is arbitrary, but usually the total addition amount is preferably 0.1% by mass or less.

Furthermore, in the unleaded gasoline of the present invention, if necessary, butane and butenes obtained by distillation during atmospheric distillation of crude oil, crude oil, etc., during the production of reformed gasoline, or during the production of cracked gasoline, etc. C4 fraction as the main component, isomerate obtained by isomerization of straight chain lower paraffin hydrocarbon, light naphtha, preferably desulfurized straight-run naphtha, or isopentane obtained by precision distillation of isomerate, oxygen-containing compound It is also possible to blend certain ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), tertiary amyl ethyl ether (TAEE), ethanol, toluene obtained from an aromatic production facility, or xylene. Also, a base material obtained by removing aromatic components having 9 or more carbon atoms and hydrocarbon components having 4 carbon atoms from the light catalytic cracking gasoline, the debenzene catalytic reforming gasoline, the debenzene light catalytic reforming gasoline, etc. by distillation. It is also possible to blend.
When the C4 fraction is blended, the C4 content is less than 3% by volume, preferably less than 2% by volume, and if the C4 content is within 3% by volume, the rise in RVP is suppressed, and the fuel This is preferable because the amount of evaporated gas is reduced.

The content of the present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited thereto.

Examples 1 to 4 and Comparative Examples 1 and 2
Each gasoline base material having the properties and composition shown in Table 2 was mixed at a ratio shown in Table 3 to prepare unleaded low vapor pressure gasoline, and various performance evaluation tests described below were conducted.
Startability, drivability, and demerit scores were evaluated using a 2L displacement, direct injection (DI), automatic transmission (AT) vehicle at a test temperature of 20 ° C and humidity of 50%.
In addition, the intake valve deposit (IVD) test was performed using a 1.5-liter, multi-point injection (MPI) type vehicle, and a chassis dynamo with 60-100 km / h acceleration / deceleration x 1,500 cycles (8,000 km travel). I went there.
The method is described below, and the results are shown in Table 3.

(Startability)
It was evaluated by the time from the start of cranking to the complete explosion (time until the engine can continue to rotate on its own).
(Acceleration)
The engine was idled for 10 seconds after the engine was started, and the time until the vehicle speed reached 40 km / h with an accelerator opening of 50% was evaluated.
(Demerit points)
Evaluation was performed according to the CRC (Coordinating Research Council) Report No. 483 evaluation method.
The evaluation method was determined by the demerit score given by the degree of the phenomenon that occurred (Σ = demerit score × defect coefficient).
Note that stalls during idling and running were not calculated, and the respective coefficients were added. The smaller the score, the better the performance.

(IVD test)
Evaluation was made based on the deposit (IVD weight) attached to the intake valve and IVD score (Rating: CRC No. 16) obtained by weighing the intake valve weight before and after operation. The rating value indicates that the larger the numerical value, the smaller the IVD amount.

  From the results, the unleaded high octane gasoline of the present invention has less evaporative gas from the fuel, is excellent in startability, operation performance and cleanliness of the intake valve, and can maintain the atmospheric environment while maintaining practical performance. .

Claims (3)

Unleaded gasoline characterized by satisfying the following properties.
1) Reed vapor pressure (RVP) 45 ~ 65kPa
2) 50% distillation temperature (T50) is 80 ~ 110 ℃
3) Distillation at 70 ℃ (E70) is 18-40% by volume
4) 130 ℃ distillate (E130) is 70-90 vol%
5) Aromatic content 40% or less
6) Olefin content is less than 30% by volume
7) Benzene content is less than 1% by volume
8) Sulfur content is 10 mass ppm or less
9) Density at 15 ° C is 0.68 ~ 0.78g / cm ³
10) Gas-liquid ratio (V / L) at 60 ℃ is 25-50
11) Research octane number (RON) is 89 or more and less than 97
12) Motor method octane number (MON) is 79 or more and less than 85
13) Polycyclic aromatic index represented by the following formula is 6 or less
Y = (0.002 × 3R-A) + (0.01 × 4R-A) + (0.07 × 5R-A) + (0.2 × 6R + -A)
(In the formula, 3R-A represents a 3-ring aromatic content, 4R-A represents a 4-ring aromatic content, 5R-A represents a 5-ring aromatic content, and 6R + -A represents an aromatic content of 6 or more rings. In addition, all of the aromatic content indicate mass ppm in terms of content in gasoline.) Research method octane number (RON) is 93 or more, motor method octane number (MON) is 83 or more, Reed vapor pressure (RVP) is 30 kPa or more, and debenzene contact reforming gasoline with boiling point range of 28-200 ° C is 10-40 volumes %,
Research method octane number (RON) is 87 or more, motor method octane number (MON) is 76 or more, Reid vapor pressure (RVP) is 40 kPa or more, and boiling point range is 30 to 215 ° C.
,
Research method octane number (RON) 65 or more, motor method octane number (MON) 62 or more, Reed vapor pressure (RVP) 80kPa or more, desulfurized light naphtha with boiling point range 25-110 ° C 10-30% by volume,
The research octane number (RON) is 93 or higher, the motor octane number (MON) is 90 or higher, the Reid vapor pressure (RVP) is 40 kPa or higher, the boiling point range is 30 to 215 ° C, and the C8 fraction is 50 vol% or higher. The unleaded gasoline according to claim 1, which contains 0 to 30% by volume of a chelate. Research method octane number (RON) of 78 or more, motor method octane number (MON) of 70 or more, Reed vapor pressure (RVP) of 85 kPa or more, boiling point range of 26-100 ° C, debenzene light catalytic reforming gasoline 3-25 volumes %,
Research method octane number (RON) of 101 or higher, motor method octane number (MON) of 89 or higher, Reed vapor pressure (RVP) of 3 kPa or higher, debenzene heavy contact reformed gasoline with boiling point range of 90-210 ° C 3-20 capacity%,
Research method octane number (RON) is 87 or more, motor method octane number (MON) is 76 or more, Reid vapor pressure (RVP) is 40 kPa or more, and boiling point range is 30 to 215 ° C.
,
Research method octane number (RON) 65 or more, motor method octane number (MON) 62 or more, Reed vapor pressure (RVP) 80kPa or more, desulfurized light naphtha with boiling point range 25-110 ° C 10-30% by volume,
The research octane number (RON) is 93 or higher, the motor octane number (MON) is 90 or higher, the Reid vapor pressure (RVP) is 40 kPa or higher, the boiling point range is 30 to 215 ° C, and the C8 fraction is 50 vol% or higher. The unleaded gasoline according to claim 1, which contains 0 to 30% by volume of a chelate.