JP2005029763A - Gasoline composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasoline composition capable of achieving a sufficient motor method octane value-improving effect by predicting the motor method octane value of an ethyl tert-butyl ether-blended gasoline in good accuracy. <P>SOLUTION: This gasoline composition contains 1-20 vol.% ethyl tert-butyl ether and 80-99 vol.% base gasoline based on the total amount of the composition, wherein, the base gasoline contains 1-25 vol.% n-paraffinic hydrocarbon, 20-50 vol.% iso-paraffinic hydrocarbon, 1-30 vol.% olefinic hydrocarbon and 1-50 vol.% aromatic hydrocarbon based on the total amount of the base gasoline, and exhibits ≥95 ETBMON expressed by formula (1) ETBMON=[110.6×(A)+35.3×(B)+18.2×(C)+18.7×(D)]/100+68.4 [wherein, (A), (B), (C) and (D) are each of the contents (vol.%) of the n-paraffinic hydrocarbon, iso-paraffinic hydrocarbon, olefinic hydrocarbon and aromatic hydrocarbon based on the total amount of the base gasoline]. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ethyl-t-butyl ether blended gasoline composition useful in fields such as automobile fuel.

Due to the recent increase in awareness of environmental problems, a technique for blending an oxygen-containing compound with gasoline is drawing attention in order to reduce carbon monoxide in exhaust gas. Among these, gasoline blended with methyl-t-butyl ether (MTBE) is in the spotlight (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 3-93894

  However, in the case of gasoline blended with MTBE, there is a concern about problems such as water pollution due to MTBE. Therefore, it has become necessary to study the blending of oxygen-containing compounds other than MTBE into gasoline.

  As an oxygen-containing compound other than MTBE, ethyl-t-butyl ether using ethanol derived from biomass as a raw material is conceivable from the viewpoint of suppressing global warming. However, since the apparent motor method octane number (mixed motor method octane number = mixed MON) by blending ethyl-t-butyl ether differs depending on the blended base gasoline, the motor method octane number of ethyl-t-butyl ether blended gasoline is accurately predicted in advance Thus, it was difficult to obtain a sufficient effect of improving the octane number of the motor method of ethyl-t-butyl ether.

  The present invention has been made in view of such circumstances, and can accurately predict the motor method octane number of a gasoline in which ethyl-t-butyl ether is blended with base gasoline, and has a sufficient motor method octane number improving effect. The object is to provide a gasoline composition that can be achieved.

In order to solve the above problems, the gasoline composition of the present invention contains 1 to 20% by volume of ethyl-t-butyl ether and 80 to 99% by volume of base gasoline based on the total amount of the composition. Is the following formula (1):
ETBMON = [110.6 × (A) + 35.3 × (B) + 18.2 × (C) + 18.7 × (D)] / 100 + 68.4 (1)
[In the formula, (A), (B), (C) and (D) are the content of normal paraffinic hydrocarbons (volume%) and the content of isoparaffinic hydrocarbons based on the total amount of base gasoline, respectively. (Volume%), olefinic hydrocarbon content (volume%), and aromatic hydrocarbon content (volume%)]
The ETBMON represented by the formula is 95 or more and, based on the total amount of base gasoline, the content of normal paraffinic hydrocarbon is 1 to 25% by volume, the content of isoparaffinic hydrocarbon is 20 to 50% by volume, The olefinic hydrocarbon content is 1 to 30% by volume, and the aromatic hydrocarbon content is 1 to 50% by volume.

  According to the gasoline composition of the present invention, the base gasoline having the above-mentioned specific hydrocarbon composition and satisfying the condition represented by the formula (1) and ethyl-t-butyl ether are contained in specific amounts, respectively. It is possible to accurately predict the motor method octane number of the gasoline composition after blending ethyl-t-butyl ether, and to maximize the motor method octane number improvement effect by blending ethyl-t-butyl ether. .

As explained above, according to the present invention, it is possible to accurately predict the motor method octane number of gasoline in which ethyl-t-butyl ether is blended with base gasoline, and to achieve a sufficient motor method octane number improvement effect. A gasoline composition is provided.

  Hereinafter, the present invention will be described in detail.

(Ethyl-t-butyl ether)
The gasoline composition of the present invention contains 1 to 20% by volume of ethyl-t-butyl ether based on the total amount of the composition. The content of ethyl-t-butyl ether needs to be 1% by volume or more from the viewpoint of the motor method octane number improving effect. In addition, the content of ethyl-t-butyl ether is required to be 20% by volume or less, preferably 15% by volume or less, more preferably 10%, from the viewpoint of suppressing the influence on the fuel supply system members of already sold vehicles. The capacity is less than%.

  The production method of ethyl-t-butyl ether is not particularly limited, and all ethyl-t-butyl ethers obtained from known production methods can be used. Examples of the production method include a method in which isobutene and ethanol are reacted with a catalyst using a strongly acidic ion exchange resin. Ethanol, which is a raw material for ethyl-t-butyl ether, may be obtained from a known production method, but in consideration of environmental effects such as carbon dioxide emissions during production, corn, sugar cane and other agricultural products, or It is preferable that it is ethanol manufactured with biomass using wood resource waste.

(Base gasoline)
The gasoline of the present invention contains 80 to 99% by volume of base gasoline, preferably 85 to 99% by volume, more preferably 90 to 99% by volume, based on the total amount of the composition.

Such base gasoline is based on the total amount of base gasoline, 1-25% by volume of normal paraffinic hydrocarbons, 20-50% by volume of isoparaffinic hydrocarbons, 1-30% by volume of olefinic hydrocarbons, aromatic carbonized 1 to 50% by volume of hydrogen, and the following formula (1):
ETBMON = [110.6 × (A) + 35.3 × (B) + 18.2 × (C) + 18.7 × (D)] / 100 + 68.4 (1)
[In the formula, (A), (B), (C) and (D) are the content of normal paraffinic hydrocarbons (volume%) and the content of isoparaffinic hydrocarbons based on the total amount of base gasoline, respectively. (Volume%), olefinic hydrocarbon content (volume%), and aromatic hydrocarbon content (volume%)]
The ETBMON represented by

  ETBMON represented by the formula (1) is an index for the base gasoline found by the present inventors in order to obtain the mixed motor method octane number (mixed MON) when ethyl-t-butyl ether is blended with the base gasoline. It means that the larger the value of ETBMON is, the higher the octane number improving effect by blending ethyl-t-butyl ether in the gasoline blended with ethyl-t-butyl ether. Therefore, ETBMON needs to be 95 or more, preferably 100 or more, and most preferably 105 or more.

  As described above, the content of the normal paraffinic hydrocarbon in the base gasoline needs to be 1 to 25% by volume, and preferably 5 to 25% by volume.

  As described above, the content of the isoparaffinic hydrocarbon in the base gasoline needs to be 20 to 50% by volume, and preferably 25 to 50% by volume.

  As described above, the content of the olefinic hydrocarbon in the base gasoline is required to be 1 to 30% by volume, and preferably 1 to 25% by volume.

  As described above, the content of the aromatic hydrocarbon in the base gasoline needs to be 1 to 50% by volume, preferably 1 to 45% by volume.

  The motor method octane number improving effect by ethyl-t-butyl ether in the present invention is the same as that of the base gasoline ETBMON, and the contents of normal paraffinic hydrocarbon, isoparaffinic hydrocarbon, olefinic hydrocarbon and aromatic hydrocarbon. If any one of these is out of the above range, the effect of improving the octane number of the motor method by ethyl-t-butyl ether in gasoline containing ethyl-t-butyl ether is obtained. It becomes insufficient.

  Further, the content of naphthenic hydrocarbon in the base gasoline is preferably 10% by volume or less, more preferably 6% by volume or less, and further preferably 3% by volume or less.

  The content of normal paraffin hydrocarbons, isoparaffin hydrocarbons, olefin hydrocarbons, aromatic hydrocarbons and naphthenic hydrocarbons in the base gasoline referred to here is the Japan Petroleum Institute Standard JPI-5S-52-99 “ It means the content (volume%) of each component in the base gasoline measured according to gasoline-total composition analysis method-capillary column chromatography method.

(Base gasoline motor method octane number)
Although the motor method octane number (MON) of the base gasoline concerning this invention is not specifically limited, From the point which prevents knocking of the gasoline composition after mixing ethyl-t-butyl ether, and improves drivability, it is 78. 0.0 or more is preferable.

  In addition, the motor method octane number here means the motor method octane number measured by JIS K 2280 “Octane number and cetane number test method”.

(Base gasoline density)
The density at 15 ° C. of the base gasoline according to the present invention is not particularly limited, but is preferably 0.710 to 0.770 g / cm ³ . If the density of the base gasoline is less than 0.710 g / cm ² , the fuel efficiency may be deteriorated. On the other hand, if it exceeds 0.770 g / cm ³ , the acceleration may be deteriorated and the plug may be smoldered. is there. The density here means a density measured by JIS K 2249 “Density test method and density / mass / capacity conversion table for crude oil and petroleum products”.

(Distillation properties of base gasoline)
The distillation properties of the base gasoline according to the present invention include a distillation amount (E70) at a distillation temperature of 70 ° C., a distillation amount (E90) at a distillation temperature of 90 ° C., and a distillation amount (E150) at a distillation temperature of 150 ° C. ) Preferably satisfies the following conditions.

  E70 is preferably 20% by volume or more, and more preferably 25% by volume or more, from the viewpoint of preventing deterioration in mid- and low-temperature drivability. Further, if the value of E70 is too large, fuel consumption and high temperature drivability may be deteriorated. Therefore, 42% by volume or less is preferable, and 38% by volume or less is more preferable.

  E90 is preferably 37% by volume or more, and more preferably 42% by volume or more, from the viewpoint of preventing deterioration in mid- and low-temperature drivability. Further, if the value of E90 is too large, the fuel consumption may be deteriorated, so 60% by volume or less is preferable, and 55% by volume or less is more preferable.

  E150 is preferably 80% by volume or more, more preferably 85% by volume or more, and most preferably 90% by volume or more from the viewpoint of preventing adhesion of the deposit precursor to the intake valve. When E150 is less than 80% by volume, gasoline becomes heavier and undesirably increases the deposit on the intake valve.

  In addition, E70, E90, and E150 here mean the distillate amount measured by the method based on JISK2254 "petroleum product-distillation test method".

(Sulfur content of base gasoline)
The sulfur content of the base gasoline according to the present invention is preferably 10 ppm by mass or less, and more preferably 8 ppm by mass or less, based on the total amount of the base gasoline. If the sulfur content exceeds 10 ppm by mass, the performance of the exhaust gas treatment catalyst may be adversely affected, the concentration of NOx, CO, and HC in the exhaust gas may increase, and the amount of benzene emitted also increases. there is a possibility. The sulfur content here means the sulfur content measured by JIS K 2541 “Crude oil and petroleum products—Sulfur content test method”.

(Preparation of base gasoline)
The base gasoline according to the present invention can be prepared using various gasoline base materials so that the hydrocarbon composition satisfies the above specific conditions.

  The gasoline base material can be produced by any conventionally known method. Specifically, for example, light naphtha obtained by atmospheric distillation of crude oil, catalytic cracked gasoline obtained by catalytic cracking method, hydrocracked gasoline obtained by hydrocracking method, reformed gasoline obtained by catalytic reforming method , Raffinate, which is a residue extracted from reformed gasoline, polymerized gasoline obtained by polymerization of olefin, alkylate obtained by adding (alkylating) lower olefin to hydrocarbons such as isobutane, light naphtha Isomerized gasoline, denormalized paraffin oil, butane, aromatic hydrocarbon compounds, and propylene dimerized by converting isomerized to isoparaffin using an isomerizer, followed by hydrogenation of this, paraffin fraction, natural gas GT obtained by FT (Fischer-Tropsch) synthesis after decomposition of carbon and the like into carbon monoxide and hydrogen The substrate, such as light distillates (Gas to Liquids) can be prepared by mixing one or two or more.

A typical base gasoline formulation is described below. However, the individual blending amount of each gasoline base is adjusted so that the finally obtained gasoline satisfies the regulations as the gasoline composition of the present invention.
(1) Reformed gasoline: 0 to 70% by volume
(2) Light fraction of reformed gasoline (boiling range: about 25 to 120 ° C.): 0 to 35% by volume
(3) Heavy fraction of reformed gasoline (boiling point range: about 110 ° C. to 200 ° C.): 0 to 45% by volume
(4) Cracked gasoline: 0-50% by volume
(5) Light fraction of cracked gasoline (boiling point range: about 25 to 90 ° C.): 0 to 45% by volume
(6) Alkylate: 0 to 40% by volume
(7) Isomerized gasoline: 0 to 30% by volume
(8) Light naphtha: 0 to 40% by volume
(9) Butane: 0 to 10% by volume.

(Motor method octane number of gasoline composition)
In the gasoline composition of the present invention, the actual measured value of the motor method octane number can be accurately predicted based on the predicted motor method octane number shown on the left side of formulas (2) and (3) described later.

The gasoline composition of the present invention has the following formula (2):
[ETBMON × ETBE + MON × (100−ETBE)] / 100 ≧ 80 (2)
[In the formula, ETBE indicates the content (volume%) of ethyl-t-butyl ether based on the total amount of the composition, and MON indicates the motor method octane number of base gasoline]
It is preferable that the condition represented by When the value of the left side of the following formula (2) is less than 80, knock resistance is deteriorated, which is not preferable.

  In addition, the motor method octane number as used in the field of this invention means the motor method octane number measured by JISK2280 "an octane number and a cetane number test method" (hereinafter, it is the same).

Further, the gasoline composition of the present invention has the following formula (3):
[ETBMON × ETBE + MON × (100−ETBE)] / 100 ≧ 87 (3)
[In the formula, ETBE indicates the content (volume%) of ethyl-t-butyl ether based on the total amount of the composition, and MON indicates the motor method octane number of base gasoline]
It is preferable that the condition represented by

  The measured value of the motor method octane number of the gasoline composition of the present invention is preferably 80 or more from the viewpoint of preventing knocking and improving drivability. Furthermore, when the gasoline composition of the present invention is used in a premium gasoline specification vehicle, the motor octane number is preferably 87 or more in order to maximize the performance of the vehicle.

(Distillation properties of gasoline composition)
The distillation property of the gasoline composition of the present invention is not particularly limited, but is preferably as follows. The distillation property as used herein means a distillation property measured by JIS K 2254 “Petroleum products—Distillation test method”.

First distillation point: 20-37 ° C
10 volume% distillation temperature (T10): 35-70 degreeC
30% by volume distillation temperature (T30): 55 to 77 ° C
50 volume% distillation temperature (T50): 75-105 degreeC
70 vol% distillation temperature (T70): 95-135 ° C
90 volume% distillation temperature (T90): 115-175 degreeC
Distillation end point: 150-215 ° C.

  The distillation initial boiling point is preferably 20 ° C or higher, more preferably 23 ° C or higher. If the distillation initial boiling point is less than 20 ° C., hydrocarbons in the exhaust gas may increase. On the other hand, the distillation initial boiling point is preferably 37 ° C. or lower, more preferably 35 ° C. or lower. When the distillation initial boiling point exceeds 37 ° C., low temperature drivability may be lowered.

  T10 is preferably 35 ° C. or higher, more preferably 40 ° C. or higher. When T10 is less than 35 ° C., hydrocarbons in the exhaust gas may increase, and high temperature operability may decrease due to vapor lock. On the other hand, T10 is preferably 70 ° C. or lower, more preferably 60 ° C. or lower. When T10 exceeds 70 ° C, the low temperature startability may be reduced.

  T30 is preferably 55 ° C. or higher, more preferably 60 ° C. or higher. When T30 is less than 55 ° C., fuel consumption may be reduced. On the other hand, T30 is preferably 77 ° C or lower, more preferably 75 ° C or lower, and further preferably 70 ° C or lower. When T30 exceeds 77 ° C, the medium / low temperature drivability may be lowered.

  T50 is preferably 75 ° C. or higher, more preferably 80 ° C. or higher. When T50 is less than 75 ° C., fuel consumption may be reduced. On the other hand, T50 is preferably 105 ° C. or lower, more preferably 100 ° C. or lower, and further preferably 95 ° C. or lower. When T50 exceeds 105 ° C., the normal temperature drivability may be deteriorated.

  T70 is preferably 95 ° C. or higher. When T70 is less than 95 ° C., fuel consumption may be reduced. On the other hand, T70 is preferably 135 ° C. or lower, more preferably 130 ° C. or lower. When T70 exceeds 135 ° C., the medium / low temperature operability during cold operation may decrease, and there may be an increase in hydrocarbons in exhaust gas, an increase in intake valve deposits, and an increase in combustion chamber deposits. .

  T90 is preferably 115 ° C. or higher, more preferably 120 ° C. or higher. When T90 is less than 115 ° C., fuel consumption may be deteriorated. On the other hand, from the viewpoint of preventing phenomena such as low temperature and cold temperature drivability when cold, increased dilution of engine oil with gasoline, increased hydrocarbon exhaust gas, engine oil deterioration and sludge generation, T90 is Preferably it is 175 degrees C or less, More preferably, it is 170 degrees C or less, More preferably, it is 165 degrees C or less.

  The end point of distillation is preferably 150 ° C. or higher. The distillation end point is preferably 215 ° C. or lower, more preferably 200 ° C. or lower, and further preferably 195 ° C. or lower. When the distillation end point exceeds 215 ° C., intake valve deposits and combustion chamber deposits may increase, and spark plug smoldering may occur.

(Density of gasoline composition)
Although the density in 15 degreeC of the gasoline composition of this invention is not specifically limited, It is preferable that it is 0.710-0.770 g / cm < ³ >. If the density of the gasoline composition is less than 0.710 g / cm ³ , the fuel efficiency may be deteriorated. On the other hand, if it exceeds 0.770 g / cm ³ , the acceleration may be deteriorated and the plug may be smoldered. There is. The density here means a density measured by JIS K 2249 “Density test method and density / mass / capacity conversion table for crude oil and petroleum products”.

(Sulfur content of gasoline composition)
The sulfur content of the gasoline composition of the present invention is not particularly limited, but is preferably 10 mass ppm or less, more preferably 8 mass ppm or less, based on the total amount of the composition. If the sulfur content exceeds 10 ppm by mass, the performance of the exhaust gas treatment catalyst may be adversely affected, the concentration of NOx, CO, and HC in the exhaust gas may increase, and the amount of benzene emitted also increases. there is a possibility. The sulfur content here means the sulfur content measured by JIS K 2541 “Crude oil and petroleum products—Sulfur content test method”.

(Lead vapor pressure of gasoline composition)
The lead vapor pressure (RVP) of the gasoline composition of the present invention is not particularly limited, but is preferably adjusted according to the season and region in which the gasoline composition is used. More specifically, it is desirable to adjust to 44 to 65 kPa, more preferably 50 to 65 kPa, and most preferably 55 to 65 kPa in summer (May to September). On the other hand, in winter (October to April), it is preferably adjusted to 65 to 93 kPa, more preferably 70 to 93 kPa, and most preferably 70 to 90 kPa.

(Content of normal paraffinic hydrocarbon and isoparaffinic hydrocarbon in gasoline composition)
The content of normal paraffin hydrocarbons contained in the gasoline composition of the present invention is not particularly limited as long as the content based on the total amount of base gasoline is within the above range and satisfies the above formula (1). However, since the octane number improvement effect by ethyl-t-butyl ether can be exhibited to the maximum, 1 to 24% by volume is preferable and 5 to 24% by volume is more preferable based on the total amount of the composition. Similarly, the content of isoparaffinic hydrocarbon is preferably 20 to 49% by volume, and preferably 25 to 49% by volume based on the total amount of the composition. The content of normal paraffinic hydrocarbons and isoparaffinic hydrocarbons as used herein refers to the gasoline composition measured in accordance with the Petroleum Institute Standard JPI-5S-52-99 “Gasoline—Total Composition Analysis—Capillary Column Chromatography”. It means the content (volume%) of normal paraffinic hydrocarbon and isoparaffinic hydrocarbon in the product.

(Aromatic hydrocarbon content in gasoline composition)
The content of the aromatic hydrocarbon contained in the gasoline composition of the present invention is not particularly limited as long as the content based on the total amount of base gasoline is within the above range and satisfies the above formula (1). However, it is preferably 40% by volume or less, more preferably 35% by volume or less, based on the total amount of the composition. If the amount of aromatic hydrocarbons in the gasoline composition exceeds 40% by volume, intake valve deposits and combustion chamber deposits may increase, and spark plug smoldering may occur. Alternatively, the concentration of benzene in the exhaust gas may increase. The aromatic hydrocarbon content mentioned here is an aromatic in a gasoline composition measured according to the Petroleum Institute Standard JPI-5S-52-99 “Gasoline—Total Composition Analysis—Capillary Column Chromatography”. Means the content (volume%) of hydrocarbons.

(Content of olefinic hydrocarbon in gasoline composition)
The content of the olefinic hydrocarbon contained in the gasoline composition of the present invention is not particularly limited as long as the content based on the total amount of the base gasoline is within the above range and satisfies the above formula (1). , Preferably 30% by volume or less, and more preferably 25% by volume or less. If the olefinic hydrocarbon exceeds 30% by volume, the oxidation stability of gasoline may be deteriorated and intake valve deposits may be increased. The content of the olefinic hydrocarbon referred to here is the olefinic carbonization in the gasoline composition measured according to the Petroleum Institute Standard JPI-5S-52-99 “Gasoline—total composition analysis method—capillary column chromatography method”. This means the hydrogen content (volume%).

(Naphthenic hydrocarbon content in gasoline composition)
The content of the naphthenic hydrocarbon contained in the gasoline composition of the present invention is preferably 10% by volume or less, more preferably 6% by volume or less, and further preferably 3% by volume or less. The content of naphthenic hydrocarbon referred to here is naphthenic carbonization in a gasoline composition measured according to Petroleum Institute Standard JPI-5S-52-99 “Gasoline—Total Composition Analysis—Capillary Column Chromatography”. This means the hydrogen content (volume%).

(Oxidation stability of gasoline composition)
The oxidation stability of the gasoline composition of the present invention is not particularly limited, but is preferably 480 minutes or more, and more preferably 1440 minutes or more. If the oxidative stability is less than 480 minutes, gum may form during storage. The oxidation stability here means a value measured by JIS K 2287 “Gasoline oxidation stability test method (induction period method)”.

(Gum amount of gasoline composition)
The amount of unwashed actual gum of the gasoline composition of the present invention is not particularly limited, but is preferably 20 mg / 100 mL or less. Moreover, it is preferable that it is 3 mg / 100 mL or less, and, as for a washing | cleaning real gum amount, it is more preferable that it is 1 mg / 100 mL or less. When the unwashed actual gum amount and the washed actual gum amount exceed the above values, there is a risk of formation of precipitates in the fuel introduction system or sticking to the intake valve. The unwashed actual gum amount and the washed actual gum amount as used herein mean values measured by JIS K 2261 “Petroleum products—automobile gasoline and aviation fuel oil—existing gum test method—injection evaporation method”.

(Copper plate corrosive)
It is preferable that the copper plate corrosivity of the gasoline composition of the present invention is low. More specifically, it is preferable that the measured value of copper plate corrosion obtained in accordance with JIS K 2513 “Petroleum product-copper plate corrosion test method” (test temperature 50 ° C., test time 3 hours) is 1 or less, More preferably, it is 1a or less. If the measured value exceeds 1, the fuel system conduit may corrode.

(Cleaning dispersant)
The gasoline composition of the present invention may contain a cleaning dispersant as required. As the cleaning dispersant, compounds known as gasoline cleaning dispersants such as succinimide, polyalkylamine, and polyetheramine can be used. Among these, those having no residue when pyrolysis is performed at 300 ° C. in air are desirable. Preferably, polyisobutenylamine and / or polyetheramine is used. Intake valve deposits can be prevented by the addition of a cleaning dispersant. The content of the cleaning dispersant is preferably 25 to 1000 mg / L based on the total amount of gasoline, more preferably 50 to 500 mg / L, and most preferably 100 to 300 mg / L from the viewpoint of preventing intake valve deposits.
(Other additives)
Specific examples of other additives that can be added to the gasoline composition of the present invention include N, N′-diisopropyl-p-phenylenediamine, N, N′-diisobutyl-p-phenylenediamine, 2, Antioxidants such as 6-di-t-butyl-4-methylphenol and hindered phenols, and metal deactivators such as amine carbonyl condensation compounds such as N, N′-disalicylidene-1,2-diaminopropane Surface ignition inhibitors such as organic phosphorus compounds, anti-freezing agents such as polyhydric alcohols or ethers thereof, alkali metal or alkaline earth metal salts of organic acids, auxiliary alcohols such as higher alcohol sulfates, anionic surface activity Agent, cationic surfactant, antistatic agent such as amphoteric surfactant, colorant such as azo dye, organic carboxylic acid or the like Derivatives, rust preventives such as alkenyl succinic acid esters, draining agents such as sorbitan esters, identification agents such as kirizanine and coumarin, odorants such as natural essential oil synthetic fragrances, higher carboxylic acid monoglycerides and higher carboxylic acid amides Examples thereof include friction modifiers such as a mixture of compounds.

  One or two or more of these additives can be added, and the total addition amount is preferably 0.1% by mass or less based on the total amount of gasoline.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all.

(Measurement methods for various properties)
The properties of base gasoline and gasoline composition in the examples and comparative examples mean the values shown below.

  The contents of normal paraffin hydrocarbons, isoparaffin hydrocarbons, olefin hydrocarbons, aromatic hydrocarbons and naphthene hydrocarbons are determined by the Petroleum Institute Standard JPI-5S-52-99 "Gasoline-All Composition Analysis Method- The content (volume%) of each component in the gasoline composition measured in accordance with the capillary column chromatography method is indicated.

  ETBMON is represented by the formula (1).

  The density is a density measured according to JIS K 2249 “Determination method of density of crude oil and petroleum products and density / mass / capacity conversion table”.

  The motor method octane number (MON) is a measured value of the motor method octane number measured according to JIS K 2280 “Testing method for octane number and cetane number”.

  The predicted motor method octane number is a value obtained based on the left side of equations (2) and (3).

  Δ (motor method octane number) is the value obtained by subtracting the motor method octane number (actual value) of the base gasoline from the motor method octane number (actual value) of the gasoline composition, and is an index of the motor method octane number improvement effect by ethyl-t-butyl ether It is.

  All the distillation properties are values measured by JIS K 2254 "Petroleum products-Distillation test method".

  Vapor pressure refers to the lead vapor pressure (RVP) measured by JIS K 2258 “Crude oil and fuel oil vapor pressure test method (Lead method)”.

  The sulfur content is the mass content of the sulfur content based on the total amount of gasoline composition measured by JIS K2541 “Sulfur content test method”.

  The oxidation stability refers to a value measured by JIS K 2287 “Gasoline oxidation stability test method (induction period method)”.

  The unwashed actual gum amount and the washed actual gum amount are the unwashed actual gum amount and the washed actual gum amount measured according to JIS K 2261 “Petroleum products—Automotive gasoline and aviation fuel oil—Real gum test method—Jet evaporation method”. Point to.

  Copper plate corrosion refers to a value measured according to JIS K 2513 “Petroleum products—copper plate corrosion test method” (test temperature 50 ° C., test time 3 hours).

(Base gasoline)
Using base materials such as cracked gasoline, reformed gasoline, light naphtha, alkylate and the like, base gasolines 1 to 8 shown in Table 1 were prepared and used as base gasolines in the following Examples and Comparative Examples.

［実施例１、比較例１］
実施例１ではベースガソリン１、比較例１ではベースガソリン５を用い、表２に示すガソリン組成物を調製した。

[Example 1, Comparative Example 1]
The gasoline composition shown in Table 2 was prepared by using base gasoline 1 in Example 1 and base gasoline 5 in Comparative Example 1.

［実施例２、比較例２］
実施例２ではベースガソリン２、比較例２ではベースガソリン６を用い、表３に示すガソリン組成物を調製した。

[Example 2, Comparative Example 2]
In Example 2, the gasoline composition shown in Table 3 was prepared using base gasoline 2 and Comparative Example 2 using base gasoline 6.

［実施例３、比較例３］
実施例３ではベースガソリン３、比較例３ではベースガソリン７を用い、表４に示すガソリン組成物を調製した。

[Example 3, Comparative Example 3]
The gasoline composition shown in Table 4 was prepared by using base gasoline 3 in Example 3 and base gasoline 7 in Comparative Example 3.

［実施例４、比較例４］
実施例４ではベースガソリン４、比較例４ではベースガソリン８を用い、表５に示すガソリン組成物を調製した。

[Example 4, Comparative Example 4]
The gasoline composition shown in Table 5 was prepared by using base gasoline 4 in Example 4 and base gasoline 8 in Comparative Example 4.

表２に示す通り、実施例１と比較例１とは、ベースガソリンのモーター法オクタン価が同程度であり、また、エチル−ｔ−ブチルエーテルとベースガソリンとの含有割合が同じであるが、実施例１の方がエチル−ｔ−ブチルエーテルによるモーター法オクタン価向上効果が高いことが分かる。

As shown in Table 2, Example 1 and Comparative Example 1 have the same motor octane number of base gasoline and the same content ratio of ethyl-t-butyl ether and base gasoline. It can be seen that No. 1 has a higher effect of improving the octane number by the motor method with ethyl-t-butyl ether.

  Similarly, from the results shown in Tables 3 to 5, in the comparison between Example 2 and Comparative Example 2, Example 3 and Comparative Example 3, Example 4 and Comparative Example 4, Examples 2, 3, and 4 were compared. It can be seen that ethyl-t-butyl ether is highly effective in improving the octane number by the motor method.

Claims (1)

Containing 1 to 20% by volume of ethyl-t-butyl ether and 80 to 99% by volume of base gasoline based on the total amount of the composition;
The base gasoline is based on the total amount of base gasoline, 1-25% by volume of normal paraffinic hydrocarbons, 20-50% by volume of isoparaffinic hydrocarbons, 1-30% by volume of olefinic hydrocarbons, aromatic carbonized 1 to 50% by volume of hydrogen, and the following formula (1):
ETBMON = [110.6 × (A) + 35.3 × (B) + 18.2 × (C) + 18.7 × (D)] / 100 + 68.4 (1)
[In the formula, (A), (B), (C) and (D) are the content of normal paraffinic hydrocarbons (volume%) and the content of isoparaffinic hydrocarbons based on the total amount of base gasoline, respectively. (Volume%), olefinic hydrocarbon content (volume%), and aromatic hydrocarbon content (volume%)]
A gasoline composition having an ETBMON of 95 or more.