JPH07207285A - Fuel oil for gasoline engine - Google Patents

Abstract

PURPOSE:To obtain a fuel oil excellent in performance as automobile engine oil, being lead-free and lowly polluting, and having a high octane number. CONSTITUTION:The fuel oil (1) comprises 3-10vol.% fraction of a boiling point of below 25 deg.C, 35-50vol.% fraction of a boiling point of 25 to below 75 deg.C, 25-40vol.% fraction of a boiling point of 75 deg.C to below 125 deg.C, 10-30vol.% fraction of a boiling point of 125 to below 175 deg.C and at most 5vol.% fraction of a boiling point of 175 deg.C or above, (2) has a research octane number of each fraction of at least 70, (3) has an exhaust gas index Y of 5 or below (wherein Y is represented by the formula: Y=1.07BZ+0.120TO+0.11BE+0.05XY+0.03C9<+>A +0.005 [100-(BZ+TO+EB+XY+C9<+>A)], wherein BZ, TO, EB, XY and C9<+>A are respectively the contents (vol.%) of benzene, toluene, ethylbenzene, xylene and a 9C or higher aromatic component), (4) has a benzene content of 1vol.% or below and a sulfur content of 1vol.% or below, and (5) has a research octane number of 89-92.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel fuel oil for gasoline engines. More specifically, the present invention relates to a fuel oil for a lead-free high octane gasoline engine that has excellent driving performance of an automobile and low pollution.

[0002]

2. Description of the Related Art Since the addition of lead compounds such as tetraethyllead as an octane number improver was regulated, unleaded high octane gasoline was actively developed, and various unleaded high octane gasolines were proposed and put on the market. Came. Further, recently, as a high octane number base material, lead-free high octane number gasoline to which oxygen-containing compounds such as alcohols and ethers are added has been proposed. Examples of such a high octane gasoline include, for example, catalytic reforming gasoline and catalytic cracking gasoline, or a mixture thereof with an alkylate, methyl tertiary butyl ether (MT
Gasoline prepared by adding BE) (JP-A-3-93894)
JP), a gasoline base material having a specific distillation property and a specific composition, and MTBE mixed with the gasoline base material (Japanese Patent Laid-Open No. Hei 3
No. 263493), a butane-butene fraction, a base oil in which an aliphatic hydrocarbon component and an aromatic hydrocarbon component are blended at a constant ratio, and a fuel oil composition having a research method octane number of 105 or more obtained by adding MTBE. Thing (JP-A-3-229
No. 796) is known. However, if the amount of MTBE added is increased in order to increase the octane number of gasoline, the fuel consumption is reduced due to the reduction in density and NO _x in the exhaust gas is reduced.
Will increase. Moreover, catalytically cracked gasoline, which is one of the major base of gasoline sulfur content much in comparison with the other substrate, which leads to SO _x increase in the exhaust gas. Further, when the sulfur content in gasoline is large, the activity of the three-way catalyst decreases due to poisoning of the catalyst, and as a result, NO _x in the exhaust gas increases. Thus, the MTBs proposed so far
The unleaded high octane gasoline blended with E is aimed at improving the octane number and drivability, and the amount of NO _x and SO _{x in} the exhaust gas is not sufficiently reduced, and from the viewpoint of pollution prevention. It was not always satisfactory when I saw it. Further, when the amount of benzene in the gasoline is large, the gasoline itself has a bad influence on the human body, and the amount of benzene in the exhaust gas is large, which causes problems such as environmental pollution.

[0003]

Under the above circumstances, the present invention provides a high-speed knock resistance, acceleration, flammability, startability,
The object of the present invention is to provide a fuel oil for a gasoline engine that is excellent in driving performance such as drivability and has low pollution such as benzene content in exhaust gas, NO _X , SO _X, etc., and is lead-free and high octane number. To do.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to develop a fuel oil for a lead-free high octane gasoline engine which has excellent driving performance and low pollution, and as a result, has a specific distillation property. However, the research method octane number of each fraction is 7
Exhaust gas index which is 0 or more and is expressed by a specific formula,
It has been found that a gasoline engine fuel oil having a benzene content and a sulfur content below a specific value and a research octane number in the range of 89 to 92 can meet the purpose. The present invention has been completed based on such findings. That is, the present invention includes (1) a fraction having a boiling point of less than 25 ° C, 3 to 10% by volume, a fraction having a boiling point of 25 ° C or more and less than 75 ° C, 35 to 50% by volume, and a boiling point of 75 ° C or more and less than 125 ° C. Is 25 to 40% by volume, the fraction having a boiling point of 125 ° C. or more and less than 175 ° C. is 10 to 30% by volume, and the fraction having a boiling point of 175 ° C. or more is 5% by volume or less, (2) Research method for each fraction octane number is 70 or more, (3) (I) Y = 1.07BZ + 0.12TO + 0.11EB + 0.05XY + 0.03C 9 + A +0.005 [100- (BZ + TO + EB + XY + C 9 + A) ] · · · (I) [In the formula, BZ is a benzene content, TO is a toluene content, EB is an ethylbenzene content, XY is a xylene content, and C ₉ ⁺ A is an aromatic content having 9 or more carbon atoms (both are fuel oils). The content is the volume%). ] The exhaust gas index Y represented by 5 is 5 or less, (4) the benzene content is 1% by volume or less, and the sulfur content is 40 ppm or less, and (5) the research method octane number is 89 to 92.
A fuel oil for a gasoline engine is provided.

The fuel oil of the present invention has (1) a distillation property of a fraction having a boiling point of less than 25 ° C. of 3 to 10% by volume and a boiling point of 25.
35 to 50% by volume of the fraction of ℃ or more and less than 75 ℃, boiling point 75
25 to 40% by volume of the fraction above ℃ and less than 125 ℃, boiling point 1
The fraction having a temperature of 25 ° C or higher and lower than 175 ° C is 10 to 30% by volume, and the fraction having a boiling point of 175 ° C or higher is 5% by volume or less. Boiling point 2
If the fraction of less than 5 ° C. is less than 3% by volume, the startability is poor and 1
If it exceeds 0% by volume, vapor lock or the like occurs. Further, if the fraction having a boiling point of 25 ° C. or more and less than 75 ° C., the fraction having a boiling point of 75 ° C. or more and less than 125 ° C. and the fraction having a boiling point of 125 ° C. or more and less than 175 ° C. are in the above ranges, respectively, the drivability and the accelerating property are It will be excellent. If any one of them deviates from the above range, drivability may be deteriorated or acceleration may be deteriorated. Further, if the fraction having a boiling point of 175 ° C. or more exceeds 5% by volume, the engine becomes dirty and problems of oil dilution occur.

In the fuel oil of the present invention, (2) the research method octane number (sometimes abbreviated as RON) of each of the above fractions is 70 or more, preferably 75 or more. If this value is less than 70, a well-balanced antiknock property cannot be obtained. The distillation property was determined by a gas chromatographic method as described later, and the RON of each fraction was determined as a result of the gas chromatographic method as described later. Further, (3) where (I) Y = 1.07BZ + 0.12TO + 0.11EB + 0.05XY + 0.03C 9 + A +0.005 [100- (BZ + TO + EB + XY + C 9 + A) ] · · · (I) [wherein, BZ is Benzene content, TO is toluene content, EB is ethylbenzene content, XY is xylene content, C ₉ ⁺ A is aromatic content having 9 or more carbon atoms (both are contents in fuel oil %) Is shown. ], The exhaust gas index Y is 5 or less, preferably 4 or less, and more preferably 3.5 or less. The index Y indicates the proportion of benzene contained in exhaust hydrocarbons produced when the fuel oil burns in the engine, and each coefficient is the benzene content (% by weight) in the exhaust hydrocarbons / fuel oil. It is the value of the content (volume%) of each component therein. That is, this value is the largest in benzene, and becomes smaller as the number of substituents on the benzene ring increases, such as monoalkylbenzene, dialkylbenzene, and trialkylbenzene. In addition, paraffins and olefins are extremely small at 0.005. [100
- (BZ + TO + EB + XY + C 9 + A) ] represents a component other than the aromatic content of the fuel oil. When the exhaust gas index Y represented by the above formula (I) exceeds 5, the exhaust gas cannot be sufficiently reduced in pollution. The content of each aromatic component is a value calculated from the total composition analysis of fuel oil by gas chromatography (in accordance with JPI-5S-90 of the Japan Petroleum Institute).

In the fuel oil of the present invention, (4) the benzene content is 1.0% by volume, preferably 0.5% by volume or less, and the sulfur content is 40 ppm or less, preferably 30 pp.
m or less. If the benzene content exceeds 1.0% by volume, the fuel oil itself may adversely affect the human body, and the benzene content in the exhaust gas may increase, resulting in environmental pollution. When the sulfur content exceeds 40 ppm,
With SO _X in the exhaust gas increases, decreases the activity of the three-way catalyst by poisoning of the catalyst, it is possible to increase NO _X resulting exhaust gases. The sulfur content is a value measured by the microcoulometric titration oxidation method according to JIS K-2541. Furthermore, in the fuel oil of the present invention, the octane number of (5) research method is in the range of 89 to 92, preferably 90 to 91.

The fuel oil of the present invention may be any one as long as it satisfies the above conditions (1) to (5), and its origin is not particularly limited. It can be prepared by appropriately blending so as to satisfy the conditions (1) to (5). Examples of the gasoline base material include light naphtha obtained by fractionating a naphtha fraction obtained by atmospheric distillation of crude oil, cracked gasoline obtained by a catalytic cracking method or hydrocracking method, and a catalytic reforming method. The remaining fraction obtained by removing the benzene fraction from the reformed gasoline by the method described below, polymerized gasoline obtained by the polymerization of olefins, alkylate obtained by adding (alkylating) lower olefins to hydrocarbons such as isobutane, Examples thereof include isomerates obtained by isomerizing straight-chain lower paraffin hydrocarbons, de-n-paraffin oil, and fractions and aromatic hydrocarbons in these specific ranges.

As a method for reducing the amount of benzene in the above reformed gasoline (4 to 10% by volume of benzene), for example, the operating conditions of the catalytic reformer are changed and the C ₆ fraction in the desulfurized heavy naphtha as a raw material is changed. Removal method by distillation, method for removing benzene fraction from reformed gasoline by distillation, and catalytic reaction to convert the benzene content in reformed gasoline into cyclohexane and the like, which is then introduced to an isomerization unit. A method of isomerizing a high-octane isomer, a method of alkylating the benzene content in the reformed gasoline by a catalytic reaction to convert it into a high-octane alkyl aromatic content, and a benzene content removed and separated by the above method. ,
There is a method in which alkylation is carried out by FCC (fluid catalytic cracking) offgas containing a large amount of ethylene and the like to convert it to an alkyl aromatic content having a high octane number. The above method is a method of lowering the reaction temperature, but the dehydrogenation reaction of C ₆ naphthene in the desulfurized heavy naphtha as a raw material is rate-determining,
It is difficult to reduce the benzene content in the reformed gasoline to 4% by volume or less, and in the method, the light fraction (mainly C ₆ ) in the raw material desulfurized heavy naphtha is cut by about 45% by volume. Even so, the benzene content in the reformed gasoline is limited to about 1.5% by volume. This is because benzene is also produced from hydrocarbons having 7 or more carbon atoms. Therefore,
The above method is suitable as a method for reducing the amount of benzene in the reformed gasoline. This method is usually a method of removing the benzene fraction from the reformed gasoline by using the first splitter and the second splitter, and the benzene content in the obtained debenzene reformed gasoline is about 0 to 0.5% by volume. Fall to. In addition, the benzene content can be used as a petrochemical raw material by refining it into a benzene product or a raw material such as cyclohexane or styrene monomer. Furthermore, if this benzene is alkylated, it can be converted into an alkylbenzene such as toluene or xylene. Further, isomerization of cyclohexane can be converted into methylcyclopentane. Although the above methods 1 and 2 require the installation of a new processing device for the catalytic reaction, when there is no policy for utilizing the extracted benzene content, and the new fraction obtained from the device is a gasoline production base material. When it can be used as a raw material for petroleum and petrochemicals, it can be a more efficient benzene reduction method than the above method. In addition, there are a benzene fraction hydrotreatment method and a benzene extraction method. In the benzene fraction hydrotreating method, first, the fraction containing the benzene precursor is separated by distillation, the remaining fraction is applied to a catalytic reformer, and the reformate produced is introduced into a splitter and the benzene fraction is removed. Is isolated and hydrotreated to saturation. Further, the three components are blended again to form a mixed reformate. On the other hand, in the benzene extraction method, hydrodesulfurized naphtha is distilled to obtain i-C.
₅ ~n-C ₆ fraction was separated and subjected to catalytic reforming apparatus 70 ° C. ⁺ fraction, C ₅ fraction with splitter separates benzene toluene fraction (BT fractions) and reformate fraction.
Of these, the BT fraction is introduced into the extractor and separated into benzene (B), toluene (T) and raffinate.
Benzene is used as a petrochemical raw material, and the reformate high boiling point fraction is directly mixed with the C ₅ fraction, toluene and raffinate to form a mixed reformate.

Next, the above method will be described in more detail. In this method, reformed gasoline (reformate) is distilled to cut a light reformate fraction containing C ₅ and C ₆ fractions, which is then hydrotreated to convert benzene in the fraction into cyclohexane. Then, this cyclohexane is introduced into an isomerization device to open the ring to methylcyclopentane and n-hexane, and n-hexane is converted into an isomer with a higher octane number. This method
These various reactions can be roughly divided into two types of processes which are carried out in a double column system or a single column system. Among these, the two-column type process is outlined below. First, the feedstock oil and hydrogen are preheated in the heat exchanger, then heated in the heating furnace, and introduced into the hydrogenation reaction tower (first reaction tower). Since the hydrogenation reaction tower is an exothermic reaction, the catalyst layer is cooled by hydrogen gas and the reaction temperature is controlled. By suppressing the temperature rise, hydrocracking is suppressed, so that the liquid yield can be increased.
The treated oil discharged from the hydrogenation reaction tower is introduced into an isomerization reaction tower (second reaction tower) filled with a zeolite-based isomerization catalyst. This second reaction column does not require any heat exchanger since it is operated at almost the same temperature as the first reaction column.
The reaction product leaving this isomerization reaction tower is sent to the separation tower and separated into gas and liquid. Hydrogen is recycled to the reaction tower, the liquid phase part is sent to the stabilizer, and the off gas is separated. Next, in the one-column type process, since the hydrogenation reaction and the isomerization reaction are carried out in the same reaction column, the temperature control is performed with great care. Cooled hydrogen is supplied to each stage of the reaction tower. The downstream part has almost the same structure as the above two-column process. The reaction conditions (temperature and pressure) applied to the normal isomerization reaction in any of the systems are mild conditions, and all use hydrogen generated in the catalytic reforming. In the above-mentioned method, regardless of whether it is a double-column type or a single-column type process, the hydrogenation reaction catalyst used therein is a platinum / alumina system, is highly active and stable, and has a liquid yield. high. The isomerization catalyst is a zeolite-based catalyst, and since oil is passed at about the same temperature as the hydrogenation reaction, the heat exchange and cooling systems are simplified, construction costs are low, and it is economical. The catalyst life can be extended under mild operating conditions. To give an example of these operating conditions, the hydrogenation reaction should be performed at a pressure of 29.6.
Atm (absolute pressure), inlet temperature 180 to 250 ° C., liquid hourly space velocity (LHSV) 4 to 6 hr ⁻¹ , isomerization reaction pressure 29.6 atm (absolute pressure), inlet temperature 240 to 270
C., liquid hourly space velocity (LHSV) ¹ to 3 hr ⁻¹ . If the benzene content is simply reduced, the C _{5 to} C ₆ fraction having a benzene concentration of 30% by volume or less can be efficiently converted into cyclohexane by hydrotreating using various noble metal catalysts. The side reaction can be suppressed as much as possible.

Next, the above method will be described in more detail. This method is roughly classified into the following method I and method II. First, in the method I, the reformate fraction having C ₅ or more is first separated by distillation into a C ₅ fraction, a benzene-containing fraction and a C ₇ ⁺ heavy reformate triple fraction. The FCC off-gas is cleaned with an amine to remove hydrogen sulfide, and then immediately introduced into a benzene reduction apparatus (for example, MBR apparatus manufactured by Mobil). The FCC offgas is mostly ethylene, but contains about 5-10% propylene. In addition, ZSM-5 is used for the benzene reduction device.
A catalyst is used and a fluidized bed reactor and a slipstream regenerator are combined. Half of the diluted benzene introduced is alkylated to produce high octane number alkylbenzene. Alkylation of the dilution benzene is suitable for use ethylene, there is no problem in coexist C ₅ -C ₇ olefin. Due to alkylation of benzene, an increase in octane number is observed with a decrease in benzene. Next, in Method II, when a cyclic C ₆ compound which is a benzene precursor is supplied to the catalytic reforming device, benzene is synthesized from cyclohexane or methylcyclopentane. Therefore, it is necessary to place a naphtha splitter in advance to side cut the benzene precursor. In this method II, the side-cut cyclic C ₆ compound bypasses the catalytic reformer,
Introduced to benzene reduction equipment. Since most of the cyclic C ₆ cut is removed from the reforming feed, the low octane number light reformate is slightly reduced and the C ₅ ⁺ reformate benzene is increased to about 10% by volume. Light reformate is also separated by a stripper and introduced into a benzene reduction unit. This method produces less hydrogen from the catalytic reformer, but this reduction is less than the amount of hydrogen used in the benzene saturation process. By-passing the cyclic C ₆ cut reduces the reformate benzene by 1/2 to 3/4 and the residual benzene is alkylated by the FCC olefin gas in the benzene reduction unit. At the same time, the benzene reduction equipment decomposes extremely low octane number C ₆ ⁺ straight chain paraffins to form cyclic C
Distilled with ₆ fractions and reformate benzene.
The straight chain C ₆ cut is cracked into propane, butane and light olefins. Most of the light olefins produced are converted to gasoline. The conversion of FCC off-gas ethylene and propylene to ethylbenzene and cumene is high, and the alkylation of benzene and the decomposition of C ₆ ⁺ paraffins greatly increases research and motor octane numbers. According to this method, the constraint conditions such as excessive production of FCC off-gas fuel or insufficient propylene amount in the FCC gas plant can be relaxed. By adopting this, the operating conditions of the FCC become more severe. It is possible. Furthermore, as a modification of these, by incorporating an alkylation process of benzene in which a light olefin (for example, propylene) is mixed with a benzene-rich fraction for oil passage and reacted, between the separator and the stabilizer of the existing fixed bed reformer, Reduction of benzene can be measured.

Further, FCC (fluid catalytic cracking unit) gasoline (benzene 0.9-1.6% by volume), light FCC gasoline (benzene 1-2% by volume) and desulfurized heavy naphtha (benzene 0.9-1). (3% by volume) is usually used without debenzene treatment from the economical point of view, but of course, debenzene treatment may be used. In this case, the benzene content of the FCC gasoline can be reduced, for example, by controlling the feedstock and operating conditions, and the benzene content of the light FCC gasoline can be reduced by changing the cut temperature of the FCC gasoline during fractional distillation. It can be done by control. Further, the amount of benzene in the desulfurized heavy naphtha can be reduced by reducing the amount of naphthenic crude oil mixed.

Next, in order to suppress the sulfur content in the fuel oil to 40 ppm or less, it is essential to reduce the sulfur content in the catalytically cracked gasoline having a particularly high sulfur content in the gasoline base material. For that purpose, it is possible to desulfurize the catalytic cracking feedstock oil by hydrogenation, pass it through a catalytic cracking unit, and further introduce the produced catalytic cracking gasoline into a desulfurization unit such as a Marlox unit for desulfurization. preferable.

The fuel oil of the present invention satisfies the above conditions (1) to (5) and usually has the following composition and properties. That is, the content of oxygen-containing compounds such as MTBE, methyl tertiary amyl ether (MTAE), ethyl tertiary butyl ether (ETBE), and ethyl tertiary amyl ether (ETAE) is usually 0 to 1.
5% by volume, preferably 2 to 15% by volume, more preferably 4 to 10% by volume, the aromatic content is 10 to 40% by volume,
It is preferably 15 to 35% by volume, and the content of aromatics having 9 or more carbon atoms is 10% by volume or less, preferably 8% by volume.
Hereinafter, the olefin content is 2 to 30% by volume, preferably 5 to 30% by volume, and the [research method octane number (R
ON) + motor method octane number (MON)] / 2 is 85 or more, and Reed vapor pressure is 0.4 to 0.8 kg / cm.
^{Is 2} .

The above oxygen-containing compound has the function of improving the octane number, and when the content exceeds 15% by volume,
There is a tendency for NO _{X in} engine exhaust gas to increase.
Further, when the aromatic content is less than 10% by volume, the octane number of the obtained fuel oil is not sufficiently improved, and when a large amount of the oxygen-containing compound is added to improve the octane number, the exhaust gas is exhausted as described above. This causes an unfavorable situation such as an increase in NO _x inside. On the other hand, if it exceeds 40% by volume, rubber of various devices used in the fuel system tends to deteriorate and harmful components in the exhaust gas tend to increase. further,
When the content of aromatics having 9 or more carbon atoms in the aromatics exceeds 10% by volume, drivability at an intermediate temperature (15 to 25 ° C.), particularly acceleration responsiveness, tends to be deteriorated. The aromatic content is a value measured according to JIS K-2536, and the aromatic content having 9 or more carbon atoms is the total composition analysis of gasoline by gas chromatography (Petroleum Institute method JPI-5S). (According to −90).

Next, if the olefin content deviates from the above range, a problem occurs in the stability of fuel oil. In addition,
Here, the olefin component is usually composed mainly of an olefin having 4 to 11 carbon atoms. The olefin content is a value measured according to JIS K-2536. If the value of (RON + MON) / 2 is less than 85, high running knock resistance may be insufficient. Further, in order to suppress the aromatic content having 9 or more carbon atoms in the fuel oil to 10% by volume or less, the total composition analysis is performed on each gasoline base material by a gas chromatograph, and the aromatic content having 9 or more carbon atoms is determined. It may be 10% by volume or less. On this occasion,
As a matter of course, the component composition and properties other than the aromatic component having 9 or more carbon atoms (for example, RON, distillation property, aromatic component and olefin component) are also determined from the above total composition analysis so as to fall within an appropriate range. Should be. Here, various concrete methods for adjusting the aromatic content having 9 or more carbon atoms to 10% by volume or less are conceivable.
The method (e) can be mentioned as a suitable method.

(A) To reduce the content of aromatic components having 9 or more carbon atoms in the catalytically reformed gasoline. For this, (i)
There are methods such as lightening by removing heavy components from raw material heavy naphtha, (ii) removing heavy components from reformed gasoline, and (iii) adjusting operating conditions of a catalytic reformer. (B) When preparing fuel oil, lower the mixing ratio of catalytically reformed gasoline. (C) Lighten the catalytically cracked gasoline by removing the heavy components. (D) BTX as a petrochemical raw material from reformed gasoline
Do not use aromatics with 9 or more carbons after removing (benzene, toluene, xylene). (E) Use toluene instead of reformed gasoline.

The fuel oil of the present invention may further contain various additives, if necessary. Examples of such additives include antioxidants such as phenolic and amine compounds, metal deactivators such as Schiff type compounds and thioamide type compounds, surface ignition inhibitors such as organic phosphorus compounds, succinimide, poly Detergent-dispersing agents such as alkyl amines and polyether amines, anti-icing agents such as polyhydric alcohols and ethers, alkali metals and alkaline earth metal salts of organic acids, combustion improvers such as sulfuric acid esters of higher alcohols, anionic surfactants , Cationic surfactants, antistatic agents such as amphoteric surfactants, rust inhibitors such as esters of alkenyl succinic acid, discriminating agents such as quilizanin and coumarin, odorants such as natural essential oils and synthetic fragrances, azo dyes, etc. Known fuel oil additives such as colorants may be mentioned, and one or more of these may be added. Further, the addition amount of these additives may be appropriately selected according to the situation, but it is generally desirable that the total amount of the additives is 0.1% by weight or less of the fuel oil. Further, for a two-cycle engine, it is also possible to mix and use engine oil by a method that is usually practiced.

[0019]

[Properties of fuel oil]

(1) Octane number Measured according to JIS K-2280. (2) Sulfur content It is measured by the trace coulometric titration oxidation method according to JIS K-2541. (3) Distillation property (1) Obtained according to JIS K-2254. (4) Total composition gas chromatographic method According to JPI-5S-90 of the Japan Petroleum Institute, the content of each hydrocarbon in fuel oil is determined. Since the value is close to weight%, each hydrocarbon density is converted to volume%. Each component by this analytical method comes out in the order of boiling point. (B) Distillation property (2) The amount (volume%) of each component corresponding to a boiling point of less than 25 ° C. is integrated and calculated. Similarly, the amount of each component corresponding to each temperature range is integrated and calculated to obtain the distillation property (2). (B) RON of each fraction The product of RON of each component corresponding to a boiling point of less than 25 ° C and the amount (volume%) is integrated, and this is divided by the integrated amount (volume%) to obtain a boiling point of less than 25 ° C. Find the RON of the cut. Similarly, the RON of the fraction in each temperature range is determined. Incidentally, the RON of the mixture generally shows a higher value than the simple integrated RON. This difference is called the blend bonus (or octane number bonus), but I ignored it here. (C) Content of benzene, toluene, ethylbenzene, xylene, aromatic content having 9 or more carbon atoms The gas chromatographic analysis value is used. (5) Composition It is measured according to JIS K-2536.

[Performance of Fuel Oil] (1) Operability at Intermediate Temperature Using an EFI specification automobile engine, room temperature (20 ° C.)
At 250 rpm, accelerate from 700 rpm
The evaluation was made by the time (seconds) until reaching 0 rpm. The shorter this time, the better the fuel acceleration response. In addition,
Here, the arrival time is expressed in% based on the result of Example 1. (2) Benzene Concentration in Exhaust Gas According to TRIAS 23-991 “Gasoline Vehicle Idling, 11-Mode Emission Test Method” and SAE
Benzene in the exhaust gas was analyzed according to the method described in Paper 920320.

Example 1 and Comparative Examples 1 to 4 Gasoline base materials having the properties shown in Table 1 were mixed in the proportions shown in Table 2 to prepare fuel oils, and their properties and performances were determined. The results are shown in Table 2.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

The fuel oil for gasoline engines of the present invention is
It excels in automobile driving performance such as high-speed knock resistance, acceleration, flammability, startability, and drivability, and has low pollution such as benzene content in exhaust gas, NO _x , and SO _x .
It is unleaded high octane gasoline.

Claims (1)

[Claims] 1. A fraction having a boiling point of less than 25 ° C. is 3 to 10
35% to 50% by volume, a fraction having a boiling point of 25 ° C. or higher and lower than 75 ° C.
25% to 4% by volume of fraction with a boiling point of 75 ° C or higher and less than 125 ° C
0% by volume, 10 fractions having a boiling point of 125 ° C or higher and less than 175 ° C
˜30% by volume and the fraction having a boiling point of 175 ° C. or higher is 5% by volume or lower, (2) the research method octane number of each of the above fractions is 70 or higher, and (3) Formula (I) Y = 1. 07BZ + 0.12TO + 0.11EB + 0.05XY + 0.03C 9 + A +0.005 [100- (BZ + TO + EB + XY + C 9 + A) ] · · · (I) wherein, BZ benzene content, TO is the amount containing toluene, EB is ethyl Benzene content, XY represents xylene content, and C ₉ ⁺ A represents aromatic content having 9 or more carbon atoms (both are% by volume in the fuel oil). ] The exhaust gas index Y represented by 5 is 5 or less, (4) the benzene content is 1% by volume or less, and the sulfur content is 40 ppm or less, and (5) the research method octane number is 89 to 92.
Fuel oil for gasoline engines, characterized in that