JP3161255B2 - Fuel oil for gasoline engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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 having excellent driving performance of a vehicle and low pollution.

[0002]

2. Description of the Related Art Since the addition of a lead compound such as tetraethyl lead as an octane improver has been regulated, lead-free high octane gasoline has been actively developed, and various lead-free high octane gasolines have been proposed and put on the market. Have been. 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 have been added has been proposed. Such high octane gasoline includes, for example, catalytic reforming gasoline and catalytic cracking gasoline, or a mixture of these with alkylate, methyl tertiary butyl ether (MT
BE) added gasoline (JP-A-3-93894)
Japanese Patent Application Laid-Open No. Hei 3 (1994), a gasoline obtained by blending MTBE with a gasoline base material having a specific distillation property and component composition.
-263493), a fuel oil having a octane number of 105 or more, obtained by adding MTBE to a base oil containing a butane-butene fraction, an aliphatic hydrocarbon component and an aromatic hydrocarbon component in a fixed ratio. (Japanese Unexamined Patent Publication No. 3-229)
796). However, if the amount of MTBE added is increased in order to increase the octane number of gasoline, the fuel efficiency is reduced due to a decrease in density and NO _{x in} exhaust gas is reduced.
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. Also, when the sulfur content in the 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 MTB proposed so far is
Each of the lead-free high octane gasolines containing E aims to improve the octane number and drivability, and the reduction of NO _x and SO _{x in} exhaust gas is insufficient, and from the viewpoint of preventing pollution. Looking at it was not always satisfactory. If gasoline contains a large amount of benzene, the gasoline itself has a bad effect on the human body, and the exhaust gas contains a large amount of benzene, which causes problems such as environmental pollution.

[0003]

SUMMARY OF THE INVENTION The present invention provides a high-speed knock resistance, acceleration property, combustion property, startability,
Superior in automobile driving performance such as drivability, benzene content and in the exhaust gas, NO _X, a small low-pollution properties, such as SO _X, and aims to provide a fuel oil for gasoline engines unleaded high-octane Is what you do.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to develop a fuel oil for a lead-free high octane number gasoline engine having excellent driving performance and low pollution, and as a result, have a specific distillation property. And the research octane number of each fraction is 8
An exhaust gas index not less than 0 and represented by a specific formula,
It has been found that a fuel oil for a gasoline engine having a benzene content and a sulfur content of a specific value or less and a research octane number in the range of 97 to 102 can be suitable for the purpose. The present invention has been completed based on such findings. That is, the present invention relates to (1) a fraction having a boiling point of less than 25 ° C is 3 to 10% by volume, a fraction having a boiling point of 25 ° C or more and less than 75 ° C is 35 to 50% by volume, and a fraction having 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 of the above fractions octane number of 80 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) [Wherein, BZ is the benzene content, TO is the toluene content, EB is the ethylbenzene content, XY is the xylene content, C ₉ ⁺ A is the aromatic content having 9 or more carbon atoms (both are fuel oils). % By volume in the sample). (4) the benzene content is 1% by volume or less and the sulfur content is 40 ppm or less, and (5) the octane number of the research method is 97 to 10
2 is a fuel oil for a gasoline engine.

[0005] The fuel oil of the present invention is characterized in that (1) a distillation fraction having a boiling point of less than 25 ° C is 3 to 10% by volume,
35 to 50% by volume of a fraction having a boiling point of 75 ° C. or more and less than 75 ° C.
25 to 40% by volume of a fraction having a boiling point of not less than 125 ° C.
The fraction at 25 ° C or higher and lower than 175 ° C is 10 to 30% by volume, and the fraction at a boiling point of 175 ° C or higher is 5% by volume or less. Boiling point 2
If the fraction at 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. In addition, 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. fall within the above ranges, respectively, the operability and the accelerating property are improved. It will be excellent. If any one of them deviates from the above range, drivability is reduced or acceleration is reduced. Further, if the fraction having a boiling point of 175 ° C. or more exceeds 5% by volume, the engine becomes dirty or oil dilution occurs.

[0006] In the fuel oil of the present invention, (2) the research octane number (sometimes abbreviated as RON) of each fraction is 80 or more, preferably 85 or more. If this value is less than 80, a well-balanced anti-knock property cannot be obtained. The distillation properties were determined by gas chromatography as described below, and the RON of each fraction was determined from the results of gas chromatography as described below. 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 ethyl benzene content, XY is xylene content, C ₉ ⁺ A is aromatic content with 9 or more carbon atoms (both are based on fuel oil content. %). ] Is preferably 5 or less, preferably 4 or less, and more preferably 3.5 or less. The index Y indicates the ratio of benzene contained in the exhaust hydrocarbon generated when the fuel oil is burned in the engine, and each coefficient is expressed as benzene content (% by weight) in the exhaust hydrocarbon / fuel oil. It is the value of the content (% by volume) of each component in the sample. That is, this value is greatest for benzene, and then becomes smaller as the number of substituents on the benzene ring increases with monoalkylbenzene, dialkylbenzene, and trialkylbenzene. In addition, paraffin and olefin are extremely small at 0.005, respectively. [100
− (BZ + TO + EB + XY + C ₉ ⁺ A)] represents a component other than the aromatic component in the fuel oil. When the exhaust gas index Y represented by the above formula (I) exceeds 5, it is not possible to sufficiently reduce the exhaust gas pollution. The content of each aromatic component is a value calculated from the total composition analysis of the fuel oil by gas chromatography (based on the Japan Petroleum Institute method JPI-5S-90).

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 have an adverse effect on the human body, or the benzene content in the exhaust gas may increase, resulting in environmental pollution. When the sulfur content exceeds 40 ppm,
As SO _X in the exhaust gas increases, the activity of the three-way catalyst decreases due to poisoning of the catalyst, and as a result, NO _X in the exhaust gas also increases. The sulfur content is a value measured by a microcoulometric titration oxidation method according to JIS K-2541. Further, in the fuel oil of the present invention, (5) a research octane number of 97 to 102,
Preferably it is in the range of 98 to 101.

[0008] The fuel oil of the present invention only needs to satisfy the above conditions (1) to (5).
Although there is no particular limitation, it can be prepared, for example, by using a gasoline base material shown below and blending it appropriately so as to satisfy the conditions (1) to (5). Examples of the gasoline base material include light naphtha obtained by fractionating a naphtha fraction by atmospheric distillation of crude oil, cracked gasoline obtained by catalytic cracking or hydrocracking, and catalytic reforming. The remaining fraction obtained by removing the benzene fraction from the reformed gasoline by the method described below, a polymerized gasoline obtained by polymerization of an olefin, an alkylate obtained by adding (alkylating) a lower olefin to a hydrocarbon such as isobutane, Examples include isomerates obtained by isomerization of linear lower paraffinic hydrocarbons, de-n-paraffinized oils, and fractions and aromatic hydrocarbons in these specific ranges.

As a method for reducing the amount of benzene in the reformed gasoline (benzene 4 to 10% by volume), for example, the operating conditions of the catalytic reformer are changed, and the C ₆ fraction in the desulfurized heavy naphtha of the raw material is changed. Removal method by distillation, method of removing benzene fraction from reformed gasoline by distillation, catalytic reaction, hydrogenation of benzene in reformed gasoline to convert it to cyclohexane, etc. A method of isomerizing a high-octane isomer, a method of alkylating benzene in a reformed gasoline by a catalytic reaction and converting it into a high-octane alkylaromatic, and a method of removing and separating the benzene in the above-described method. ,
There is a method in which alkylation is carried out by an FCC (fluid catalytic cracking unit) off-gas containing a large amount of ethylene and the like to convert the gas into a high octane number alkyl aromatic component. The above method is a method of lowering the reaction temperature, but the rate of the dehydrogenation reaction of C ₆ naphthene in the raw material desulfurized heavy naphtha is limited,
It is difficult to reduce the benzene content in the reformed gasoline to 4% by volume or less. In the method, the light fraction (mainly C ₆ ) in the desulfurized heavy naphtha of the raw material is cut by about 45% by volume. Even so, the limit of benzene content in reformed gasoline is about 1.5% by volume. This is because benzene is also generated from hydrocarbons having 7 or more carbon atoms. Therefore,
The above method is suitable as a method for reducing the amount of benzene in reformed gasoline. This method is a method of removing a benzene fraction from reformed gasoline using a first splitter and a second splitter, and the benzene content in the resulting debenzene-modified gasoline is about 0 to 0.5% by volume. Down to. In addition, the benzene component can be used as a petrochemical raw material, for example, as a purified benzene product or a raw material such as cyclohexane or styrene monomer. Furthermore, if this benzene is alkylated, it can be converted to an alkylbenzene such as toluene or xylene. If cyclohexane is isomerized, it can be converted to methylcyclopentane. The above method and the above method require the installation of a new processing device for the catalytic reaction. However, when there is no method for utilizing the extracted benzene, and when the new fraction obtained from the device is When it can be used for petroleum and petrochemical materials, it can be a more efficient benzene reduction method than the above method. Other methods include a benzene fraction hydrotreating method and a benzene extraction method. Here, in the hydrotreating method of the benzene fraction, first, a fraction containing a benzene precursor is separated by distillation, the remaining fraction is subjected to a catalytic reformer, and the formed reformate is introduced into a splitter, and the benzene fraction is introduced. And hydrosaturate it. 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 iC
_{The 5-} nC ₆ fraction is separated, the 70 ° C. ⁺ fraction is subjected to a catalytic reformer, and separated into a C ₅ fraction, a benzene toluene fraction (BT fraction) and a reformate fraction by a splitter.
Of these, the BT fraction is introduced into an extraction device and separated into benzene (B), toluene (T) and raffinate.
Benzene is used in petrochemical feedstock, reformate high-boiling fraction as C ₅ fraction in a mixed reformate mixed with toluene and raffinate.

Next, the above method will be described in more detail. In this method, a reformed gasoline (reformate) is distilled to cut a light reformate fraction containing C ₅ and C ₆ fractions, and then hydrogenated to convert benzene in the fraction to cyclohexane. Further, the cyclohexane is introduced into an isomerizer to open methylcyclopentane and n-hexane, and n-hexane is converted into a higher octane isomer. This method
These various reactions can be broadly classified into two types of processes in which a two-column system or a single-column system is used. The outline of the two-column process is as follows. First, the feedstock and hydrogen are preheated in a heat exchanger, then heated in a heating furnace, and introduced into a 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. Since the hydrocracking is suppressed by suppressing the temperature rise, 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. The second reaction column operates at substantially the same temperature as the first reaction column, and does not require any heat exchanger.
The reaction product exiting the isomerization reaction tower is sent to a separation tower where it is separated into gas and liquid. The hydrogen is recycled to the reaction tower, the liquid phase is sent to a stabilizer, and off-gas is separated. Next, in the single-column process, the temperature control is performed with extreme care because the hydrogenation reaction and the isomerization reaction are performed in the same reaction column. Cooling hydrogen is supplied to each stage of the reaction tower. The downstream portion has substantially the same configuration as the above two-column process. In either method, the reaction conditions (temperature and pressure) applied to the normal isomerization reaction are performed under mild conditions, and in each case, hydrogen generated in catalytic reforming is used. In the above-mentioned method, the hydrogenation catalyst used there is platinum / alumina system, regardless of whether it is a two-column or single-column process, it is highly active and stable, and the liquid yield is high. high. The isomerization reaction catalyst is a zeolite-based catalyst, and since it is passed through oil at almost the same temperature as the hydrogenation reaction, heat exchange and cooling systems are simplified, construction costs are low and economical. Yes, and with mild operating conditions, it is possible to extend the life of the catalyst. As an example of this operating condition, the hydrogenation reaction is performed at a pressure of 29.6.
atm (absolute pressure), inlet temperature 180-250 ° C, liquid hourly space velocity (LHSV) 4-6 hr ^-1 , isomerization reaction pressure 29.6 atm (absolute pressure), inlet temperature 240-270
C. and a liquid hourly space velocity (LHSV) of ¹ to 3 hr ^-1 . Incidentally, just as long as only reduce the benzene content by treating hydrogenated using benzene concentration of 30% by volume or less of C ₅ -C ₆ fraction various noble metal catalyst, can be efficiently converted to cyclohexane In addition, side reactions 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 two methods, Method I and Method II. First, in method I, C ₅ or C ₅ fraction by distillation reformate fraction is separated into mutiple content of fractions and C ₇ ⁺ heavy reformate comprising benzene Introduction. The FCC off-gas is immediately introduced into a benzene reduction device (for example, an MBR device manufactured by Mobil) after removing hydrogen sulfide by amine washing. 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 dilute benzene introduced is alkylated to produce high octane alkylbenzene. Alkylation of the dilution benzene is suitable for use ethylene, there is no problem in coexist C ₅ -C ₇ olefin. Benzene alkylation shows an increase in octane number with a decrease in benzene. Next, in the method II, when the cyclic C ₆ compound as the benzene precursor is supplied to the catalytic reformer, benzene is synthesized from cyclohexane and methylcyclopentane. Therefore, it is necessary to arrange a naphtha splitter in advance and 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. Because most of the cyclic C ₆ cut is removed from the reforming feed, low octane light reformate is slightly less and 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 device. Although this method produces less hydrogen from the catalytic reformer, this reduction is less than the amount of hydrogen used in the process of saturating benzene. By bypassing the cyclic C ₆ cut, reformate benzene is reduced by な り to ／, and residual benzene is alkylated with FCC olefin gas in a benzene reduction unit. At the same time, the benzene reduction device decomposes extremely low octane C ₆ ⁺
Distilled with ₆ fractions and reformate benzene.
The linear C ₆ cut is decomposed into propane, butane and light olefin. Most of the light olefins produced are converted to gasoline. The conversion of FCC offgas from ethylene and propylene to ethylbenzene and cumene is high, and alkylation of benzene and decomposition of C ₆ ⁺ paraffins greatly increases research and motor octane numbers. According to this method, restraint conditions such as excessive generation of FCC off-gas fuel or shortage of propylene in the FCC gas plant can be relaxed. By adopting this method, the operating conditions of FCC become more severe. It is possible. Further, as a modification of these, a benzene alkylation process in which a light olefin (for example, propylene) is mixed and passed through a benzene-rich fraction to cause a reaction is incorporated between the separator and the stabilizer of the existing fixed-bed reformer. Benzene can be reduced.

Also, FCC (fluid cracking unit) gasoline (benzene 0.9 to 1.6% by volume), light FCC gasoline (benzene 1 to 2% by volume) and desulfurized heavy naphtha (benzene 0.9 to 1% by volume) (0.3% by volume) is usually used without debenzene treatment from the viewpoint of economy, but may of course be used after debenzene treatment. In this case, the reduction of the benzene amount of the FCC gasoline can be performed, for example, by controlling the feedstock and operating conditions, and the reduction of the benzene amount of the light FCC gasoline can be achieved by reducing the cut temperature at the time of fractionation of the FCC gasoline. It can be done by control. Further, the reduction of the amount of benzene in the desulfurized heavy naphtha can be performed by reducing the amount of the naphthenic crude oil mixed.

Next, in order to suppress the sulfur content in the fuel oil to 40 ppm or less, it is important to reduce the sulfur content in the catalytically cracked gasoline, which is particularly high in the gasoline base material. For this purpose, the catalytic cracking feedstock oil is desulfurized by hydrogenation, passed through a catalytic cracking unit, and the produced catalytic cracking gasoline is introduced into a desulfurization unit such as a Marlox unit to perform 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 15 to 45% by volume,
The content is preferably 21 to 39% 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 25% by volume, preferably 5 to 19% by volume.
ON) + motor method octane number (MON)] / 2 is 93 or more, preferably 94 or more, and the Reid vapor pressure is
It is 0.4 to 0.8 kg / cm ² .

The oxygen-containing compound has an effect of improving the octane number, and when its content exceeds 15% by volume,
Tendency for NO _X of the engine in the exhaust gas is increased can be seen.
If the aromatic content is less than 15% by volume, the octane value of the obtained fuel oil is not sufficiently improved, and when the oxygen-containing compound is added in a large amount in order to improve the octane value, the exhaust gas may be exhausted as described above. resulting in undesirable situations such as NO _X in is increased. Conversely, if it exceeds 45% by volume, the 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, the operability at an intermediate temperature (15 to 25 ° C.), particularly the acceleration responsiveness, tends to decrease. The aromatic content is a value measured according to JIS K-2536, and the content of aromatics having 9 or more carbon atoms is determined by gas chromatographic analysis of the total composition of gasoline (JPI-5S by the Japan Petroleum Institute). -90).

If the olefin content deviates from the above range, a problem arises in the stability of the 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 93, the high running knock resistance may be insufficient. Further, in order to suppress the aromatic component having 9 or more carbon atoms in the fuel oil to 10% by volume or less, the total composition of each gasoline base material was analyzed by gas chromatography, and the aromatic component having 9 or more carbon atoms was analyzed. What is necessary is just to make it 10 volume% or less. On this occasion,
Naturally, the composition and properties of components other than aromatic components having 9 or more carbon atoms (for example, RON, distillation properties, aromatic components and olefin components, etc.) are also judged from the above total composition analysis so as to be within an appropriate range. Should. Here, various methods for adjusting the aromatic content having 9 or more carbon atoms to be 10% by volume or less can be considered in various ways.
The method (e) can be mentioned as a preferable method.

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

The fuel oil of the present invention may further contain various additives as required. Such additives include, for example, antioxidants such as phenol-based and amine-based compounds; metal deactivators such as Schiff-type compounds and thioamide-type compounds; surface ignition inhibitors such as organic phosphorus-based compounds; Detergents and dispersants such as alkylamines and polyetheramines, deicing agents such as polyhydric alcohols and ethers, flame retardants such as alkali metal and alkaline earth metal salts of organic acids, sulfates of higher alcohols, and anionic surfactants Antistatic agents such as, cationic surfactants and amphoteric surfactants, rust inhibitors such as alkenyl succinic acid esters, discriminating agents such as chilizanine and coumarin, odorants such as natural essential oils and synthetic flavors, and azo dyes Known fuel oil additives such as a colorant may be used, and one or more of these may be added. The amount of these additives may be appropriately selected depending on the situation, but it is usually desirable that the total amount of the additives be 0.1% by weight or less of the fuel oil. In addition, for a two-stroke engine, it is also possible to mix and use engine oil by a commonly practiced method.

[0019]

[Properties of fuel oil]

(1) Octane value Measured according to JIS K-2280. (2) Sulfur content Sulfur content is measured by a microcoulometric titration method according to JIS K-2541. (3) Distillation properties (1) Determined in accordance with JIS K-2254. (4) Total Composition Gas Chromatography The content of each hydrocarbon in the fuel oil is determined in accordance with the Japan Petroleum Institute method JPI-5S-90. Since the value is close to% by weight, it is converted from each hydrocarbon density to% by volume. Each component according to this analytical method comes out in the order of boiling point. (A) Distillation properties (2) Calculated by integrating the amount (volume%) of each component corresponding to a boiling point of less than 25 ° C. 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 the RON of each component corresponding to a boiling point of less than 25 ° C and the amount (% by volume) is integrated, and this product is divided by the integrated amount (% by volume) to obtain a product having a boiling point of less than 25 ° C. Find the RON of the fraction. Similarly, the RON of the fraction in each temperature range is obtained. Generally, the RON of the mixture shows a higher value than the simple integrated RON. This difference is called the blend bonus (or octane bonus), but we have ignored it here. (C) Benzene, toluene, ethylbenzene, xylene, aromatic content of 9 or more carbon atoms The above gas chromatographic analysis values are used. (5) Composition Measure according to JIS K-2536.

[Performance of Fuel Oil] (1) Drivability at Intermediate Temperature Room temperature (20 ° C.) using an EFI specification automobile engine
At an engine speed of 700 rpm, 250
Evaluation was made based on the time (seconds) required to reach 0 rpm. The shorter this time is, the better the fuel acceleration response is. In addition,
Here, the arrival time is shown in% based on the result of Example 1. (2) Benzene Concentration in Exhaust Gas According to TRIAS 23-1991, "Gasoline Vehicle Idling, 11-Mode Emission Test Method" and SAE
The benzene in the exhaust gas was analyzed according to the method described in Paper 920320.

Examples 1 and 2 and Comparative Examples 1 to 4 A gasoline base material having the properties shown in Table 1 and MTBE were mixed in the proportions shown in Table 2 to prepare a fuel oil. I asked. Table 2 shows the results.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

[Table 4]

[0026]

The fuel oil for a gasoline engine of the present invention comprises:
Fast knock resistance, acceleration resistance, flammability, startability is excellent in driving the automobile performance such as drivability, benzene content and in the exhaust gas, NO _X, a small low-pollution properties, such as SO _X,
And it is unleaded high octane gasoline.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-9293 (JP, A) JP-A-7-207285 (JP, A) US Patent 4,140,622 (US, A) US Patent 4,209,383 (US, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C10L 1/04

Claims (1)

(57) [Claims] (1) A fraction having a boiling point of less than 25 ° C. is 3 to 10
35% to 50% by volume of a fraction having a boiling point of 25 ° C. or more and less than 75 ° C.
% By volume, 25 to 4 fractions with a boiling point of 75 ° C or more and less than 125 ° C
0% by volume, a fraction having a boiling point of 125 ° C. or more and less than 175 ° C.
(2) The research octane number of each fraction is 80 or more, and (3) the 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 The benzene content, XY represents the xylene content, and C ₉ ⁺ A represents the content of aromatics having 9 or more carbon atoms (both in terms of content in fuel oil by volume%). (4) the benzene content is 1% by volume or less and the sulfur content is 40 ppm or less, and (5) the octane number of the research method is 97 to 10
2. A fuel oil for a gasoline engine, wherein the fuel oil is 2.