JP3945768B2 - Unleaded gasoline composition and method for producing the same - Google Patents

Unleaded gasoline composition and method for producing the same Download PDF

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JP3945768B2
JP3945768B2 JP2002380678A JP2002380678A JP3945768B2 JP 3945768 B2 JP3945768 B2 JP 3945768B2 JP 2002380678 A JP2002380678 A JP 2002380678A JP 2002380678 A JP2002380678 A JP 2002380678A JP 3945768 B2 JP3945768 B2 JP 3945768B2
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mass
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gasoline
aroma
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JP2004210909A (en
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英治 田中
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株式会社ジョモテクニカルリサーチセンター
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Description

【0001】
【発明の属する技術分野】
本発明は環境への影響を低減した無鉛ガソリン組成物に関し、詳しくは硫黄分、オレフィン分を低減することで環境問題に配慮しつつかつ十分な運転特性を確保した無鉛ガソリン組成物およびその製造方法に関する。
【0002】
【従来の技術】
近年、環境問題の高まりからガソリン自動車技術に種々の工夫が加えられ、燃料として用いられるガソリンにも硫黄分、オレフィン分の低減が求められている。従来、ガソリンは、接触分解ガソリン基材、接触改質ガソリン基材、直留ナフサ、アルキレートなどの基材を配合して製造されている。
【0003】
硫黄分、オレフィン分は、接触分解ガソリン基材中に多く含まれている。接触分解ガソリン基材中の配合量を減らせば、硫黄分、オレフィン分を低減することができる。しかし、これを低減すると、オレフィン分はオクタン価が高い成分のため、ガソリン全体のオクタン価が低下するので、十分な運転性能が得られない。
【0004】
【発明が解決しようとする課題】
本発明は、これらの課題を解決するものであり、硫黄分、オレフィン分を低減し、かつ、十分な運転特性を確保した無鉛ガソリン組成物、また、特には、接触分解ガソリン基材の配合量を低減した無鉛ガソリン組成物の製造方法を提供する。
【0005】
【課題を解決するための手段】
本発明者は、接触改質ガソリン基材からアロマ分を抽出した留分(アロマ抽出残留分)を主なガソリン基材として用いることにより、接触分解ガソリン基材を実質的に用いなくとも十分な運転特性を有するガソリンを製造できることを見出し、この知見に基づき、本発明を完成した。
【0006】
本発明による無鉛ガソリン組成物は、リサーチ法オクタン価が89〜93であり、硫黄分が10ppm以下、オレフィン分が5質量%以下、炭素数5〜7のオレフィンの含有量が3質量%以下、炭素数5〜7のイソパラフィンの含有量が35質量%以上、炭素数7のアロマの含有量が10質量%以上であり、全アロマ含有量が40質量%以下、50%留出温度が100℃以下である。
【0007】
好ましくは、本発明による無鉛ガソリン組成物は、特には、硫黄分が5質量ppm以下、オレフィン分が3質量%以下、炭素数5〜7のオレフィンの含有量が2質量%以下、炭素数5〜7のイソパラフィンの含有量が38〜45質量%、炭素数7のアロマの含有量が10〜20質量%、全アロマ含有量が30〜40質量%、および/または、50%留出温度が85〜95℃である。
【0008】
本発明による無鉛ガソリン組成物の製造方法は、接触改質ガソリン基材からアロマ分を抽出した留分であり90%留出温度が100℃以下であるアロマ抽出残留分40質量%以上と、10%留出温度が150℃以上である重質改質ガソリン留分20質量%以上とを配合し、接触分解ガソリン基材を20質量%以下配合するか、または配合しないものである。
【0009】
好ましくは、アロマ抽出残留分は、アロマ分の含有量が0〜2質量%、90%留出温度が70〜95℃、および/または、その配合量は45〜55質量%である。また、好ましくは、重質改質留分は、10%留出温度が150〜180℃、アロマ分の含有量が90〜100質量%、および/または、その配合量は45〜55質量%である。
【0010】
【発明の実施の形態】
〔オクタン価〕
本発明による無鉛ガソリン組成物のリサーチ法オクタン価(以下、RONともいう)が89〜93である。RONは、JIS K 2280のリサーチ法オクタン価試験方法により測定できる。RONがこの範囲より高い場合は、ガソリン製造に係るコストアップに見合う性能向上が得られず、また高RON基材の偏用によってガソリンの蒸留性状がいびつになるので好ましくなく、一方低すぎる場合は、とりわけ登坂加速時にノッキングしやすくなるので好ましくない。
【0011】
〔硫黄分〕
本発明による無鉛ガソリン組成物の硫黄分は10ppm以下、好ましくは5ppm以下である。硫黄分はJIS K 2541「原油及び石油製品−硫黄分試験方法」の微量電量滴定式酸化法により測定できる。
【0012】
〔オレフィン含有量〕
本発明による無鉛ガソリン組成物のオレフィン分は、5質量%以下、好ましくは3質量%以下である。また、炭素数5〜7のオレフィンの含有量が3質量%以下、好ましくは2質量%以下である。なお、本発明でのオレフィン含有量、パラフィン含有量、アロマ含有量は、JIS K 2536「石油製品−成分試験方法」のガスクロによる全成分試験方法により測定できる。
【0013】
無鉛ガソリン組成物に含まれる炭化水素化合物のうち、芳香環を有するものをアロマに分類し、アロマ以外で不飽和結合を有するものをオレフィンに分類し、それ以外をパラフィンとしている。パラフィンの内、分岐を有するものをイソパラフィンとしている。
【0014】
〔パラフィン含有量〕
本発明による無鉛ガソリン組成物の炭素数5〜7のイソパラフィン含有量は35質量%以上、好ましくは38〜45質量%であり、また、パラフィン含有量(飽和分)は50〜85質量%が好ましい。
【0015】
〔アロマ含有量〕
本発明による無鉛ガソリン組成物において、炭素数7のアロマの含有量は10質量%以上であり、好ましくは11〜25質量%である。全アロマ含有量は40質量%以下、好ましくは30〜40質量%であり、ベンゼン含有量は1.0容量%以下が好ましい。
【0016】
〔蒸留性状〕
本発明による無鉛ガソリン組成物において、50%留出温度は100℃以下、好ましくは85〜95℃であり、10%留出温度は50〜60℃が好ましく、97%留出温度は168〜178℃が好ましい。
【0017】
〔アロマ抽出残留分〕
接触改質ガソリン基材からアロマ分を抽出した留分であり、90%留出温度が100℃以下である。この留分の好ましい性状は、飽和分(パラフィン分)が90質量%以上であり、アロマ分、オレフィン分がそれぞれ5質量%以下であり、10%留出温度が45〜65℃、90%留出温度が90〜100℃である。このようなアロマ抽出残留分を無鉛ガソリン組成物に40質量%以上、特には45〜60質量%配合することが好ましい。
【0018】
〔重質改質ガソリン留分〕
重質改質ガソリン留分は、接触改質ガソリン基材の比較的重質な、炭素数9の炭化水素を主成分とする留分であり、10%留出温度が150℃以上、好ましくは155〜170℃である留分である。この留分は、アロマ分を90質量%以上、特には95質量%以上含み、90%留出温度が165〜175℃であることが好ましい。このような重質改質ガソリン留分を無鉛ガソリン組成物に20質量%以上、特には20〜30質量%配合することが好ましい。
【0019】
〔接触分解ガソリン基材〕
本発明による無鉛ガソリン組成物には、実質的には接触分解ガソリン基材を配合しない、配合するとしても20質量%以下であり、5質量%以下であることが好ましい。接触分解ガソリン基材を製造するプロセスは、接触分解装置、原料油、運転条件を特に限定するものでなく、公知の任意の製造工程を採用できる。接触分解装置は、無定形シリカアルミナ、ゼオライトなどの触媒を使用して、軽油から減圧軽油までの石油留分の他、重油間接脱硫装置から得られる間脱軽油、重油直接脱硫装置から得られる直脱重油、常圧残さ油などを接触分解して高オクタン価ガソリン基材を得る装置である。例えば石油学会編「新石油精製プロセス」に記載のあるUOP接触分解法、フレキシクラッキング法、ウルトラ・オルソフロー法、テキサコ流動接触分解法などの流動接触分解法、RCC法、HOC法などの残油流動接触分解法などがある。
【0020】
他のガソリン基材としては、(i)原油を常圧蒸留した直留ナフサ、(ii)直留ナフサを脱硫処理した脱硫ナフサ、(iii)低級オレフィンとイソブタンを酸触媒下で反応させて得られるアルキレート、(iv)軽質ナフサを接触処理し、異性化してオクタン価を高めたアイソメレート、(v)原油や各種の2次精製装置から回収されるLPG留分や軽質ナフサなどを精密蒸留して得られるブタン、さらには、イソペンタン、トルエンなどがあり、これらを適宜選択して適宜の割合で混合して本発明の無鉛ガソリン組成物を製造することができる。これらのガソリン基材の配合量は、無鉛ガソリン組成物全量に対して合計量で、10〜40質量%、特には15〜30質量%が好ましい。
【0021】
また、メチルターシャリーブチルエーテル、エチルターシャリーブチルエーテル、ターシャリーアミルメチルエーテル、エタノール、メタノールなどの含酸素化合物からなるガソリン基材も用いることができる。これらの基材の配合量は本発明の趣旨を逸脱しない限り任意であるが、含酸素化合物を配合する場合、その配合量は1〜20容量%程度とすることが好ましい。
【0022】
本発明の無鉛ガソリン組成物には、必要に応じて公知の燃料添加剤を配合することができる。これらの配合量は適宜選べるが、通常は添加剤の合計量として0.1質量%以下とすることが好ましい。本発明の無鉛ガソリン組成物で使用可能な添加剤を例示すれば、アミン系、フェノール系、アミノフェノール系などの酸化防止剤、シッフ型化合物、チオアミド型化合物などの金属不活性化剤、有機リン系化合物などの表面着火防止剤、コハク酸イミド、ポリアルキルアミン、ポリエーテルアミンなどの清浄分散剤、多価アルコールやそのエーテルなどの氷結防止剤、有機酸のアルカリ金属塩やアルカリ土類金属塩、高級アルコールの硫酸エステルなどの助燃剤、アニオン系界面活性剤、カチオン系界面活性剤、両性界面活性剤などの帯電防止剤、アルケニルコハク酸エステルなどのさび止め剤、キニザリン、クマリンなどの識別剤、アゾ染料などの着色剤を挙げることができる。
【0023】
【実施例】
以下に本発明を実施例および比較例に基づいて、より具体的に説明するが、本発明はこれらの例によって何ら限定されるものではない。
【0024】
実施例および比較例の無鉛ガソリン組成物の製造に用いた接触分解ガソリン基材、アロマ抽出残留分、軽質ナフサ留分、重質改質留分の性状を表1に示す。接触分解ガソリン基材は、硫黄分0.29質量%の脱硫減圧重質軽油を接触分解して得た。アロマ抽出残留分は、接触改質ガソリン基材からアロマ分を溶剤抽出した残りの留分である。軽質ナフサは、直留ナフサを水素化精製し、硫黄分などを低減した留分である。重質改質ガソリン留分は、接触改質ガソリン基材の比較的重質な留分であり、炭素数9の炭化水素を主成分とする。
【0025】
密度(15℃)はJIS K 2249「原油及び石油製品−密度試験方法及び密度・質量・容量換算表」の振動式密度試験方法により、蒸留性状はJIS K 2254「石油製品−蒸留試験方法」の常圧法蒸留試験方法(減失加算)により、ベンゼン含有量はJIS K 2536のタンデム式ガスクロによる成分試験方法により、リード法蒸気圧はJIS K 2258により、硫黄分はJIS K 2541「原油及び石油製品−硫黄分試験方法」の微量電量滴定式酸化法により、RONはJIS K 2280のリサーチ法オクタン価試験方法により求めた。
【0026】
【表1】

Figure 0003945768
【0027】
表1のガソリン基材を用いて、表2に示す配合割合で、実施例1および比較例1、2に示す無鉛ガソリン組成物を調製した。調製した実施例1および比較例1、2に示す無鉛ガソリン組成物の性状などを表2に併わせて示す。さらに、添加剤としては、着色剤(シラド化学製CL-53)2mg/l、酸化防止剤(住友化学工業製スミライザー4ML)20mg/l、清浄分散剤(ビーエーエスエフ製Keropur AP-95)100mg/lを添加した。
【0028】
【表2】
Figure 0003945768
【0029】
実車にてノッキング発生回転数域および加速時間を、実施例1および比較例1、2に示す無鉛ガソリンについて評価した。評価結果を表3にまとめる。この結果から、実施例1は、比較例1、2と同程度またはそれ以下の回転数範囲でノッキングが生じており、実車において実用上十分な耐ノッキング特性を有していることがわかる。さらに、実施例1は、比較例1、2よりも加速性に優れており、実車における運転性能が優れていることがわかる。
【0030】
【表3】
Figure 0003945768
【0031】
ノッキング発生回転数域の測定方法は、石油学会のONR試験法に従う。ミッション車については最高ギア位置で、加速開始速度より1000回転以上高い速度からブレーキで速度を落とし、1000回転になったところで絞り弁全開加速を行う。加速時間の測定方法は、シフトダウンしない様に遅延加速により、時速30kmから120kmまで加速させ、最高速度に到達するまでの所要時間を計測した。
【0032】
用いた車両について、スターレットはトヨタ自動車製、平成9年式、型式/車種記号:E−EP91、エンジン形式:4E−FEであり、プリメーラは日産自動車製、平成9年式、型式/車種記号:E−EP11、エンジン形式:SR18DEであり、ミラージュは、三菱自動車製、平成9年式、型式/車種記号:E−CK2A、エンジン形式:4G15である。
【0033】
【発明の効果】
本発明による無鉛ガソリン組成物は、リサーチ法オクタン価が89〜93であり、硫黄分が5質量ppm以下、オレフィン分が5質量%以下、炭素数5〜7のオレフィンの含有量が3質量%以下、炭素数5〜7のイソパラフィンの含有量が353質量%以上、炭素数7のアロマの含有量が10質量%以上であり、全アロマ含有量が40質量%以下、50%留出温度が100℃以下であり、本発明によれば、硫黄分、オレフィン分を十分に低減し環境問題に配慮した燃料であり、同時に、実際のガソリン自動車に用いた場合に総合的に良好な運転性を提供できる。[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to an unleaded gasoline composition with reduced environmental impact, and more specifically, an unleaded gasoline composition that is environmentally friendly and has sufficient operating characteristics by reducing sulfur content and olefin content, and a method for producing the same. About.
[0002]
[Prior art]
In recent years, various innovations have been added to gasoline automobile technology due to increasing environmental problems, and gasoline used as fuel is also required to reduce sulfur content and olefin content. Conventionally, gasoline is manufactured by blending base materials such as catalytic cracking gasoline base material, catalytic reforming gasoline base material, straight run naphtha, alkylate and the like.
[0003]
A large amount of sulfur and olefin are contained in the catalytic cracking gasoline base material. If the blending amount in the catalytic cracking gasoline base is reduced, the sulfur content and the olefin content can be reduced. However, if this is reduced, since the olefin content is a component having a high octane number, the octane number of the whole gasoline is lowered, so that sufficient operating performance cannot be obtained.
[0004]
[Problems to be solved by the invention]
The present invention solves these problems, and is an unleaded gasoline composition that reduces sulfur content and olefin content and secures sufficient operating characteristics. The present invention provides a method for producing an unleaded gasoline composition with reduced content.
[0005]
[Means for Solving the Problems]
The present inventor can use a fraction obtained by extracting an aroma from a catalytically modified gasoline base (aroma extracted residue) as a main gasoline base, which is sufficient without substantially using a catalytic cracked gasoline base. Based on this finding, the present invention was completed based on the finding that gasoline having operating characteristics can be produced.
[0006]
The lead-free gasoline composition according to the present invention has a research octane number of 89 to 93, a sulfur content of 10 ppm or less, an olefin content of 5 mass% or less, a C 5-7 olefin content of 3 mass% or less, carbon The content of isoparaffins of 5 to 7 is 35% by mass or more, the content of aromas of 7 carbon atoms is 10% by mass or more, the total aroma content is 40% by mass or less, and the 50% distillation temperature is 100 ° C. or less. It is.
[0007]
Preferably, the unleaded gasoline composition according to the present invention has a sulfur content of 5 mass ppm or less, an olefin content of 3 mass% or less, a content of olefins of 5 to 7 carbon atoms of 2 mass% or less, and a carbon number of 5 The content of -7 isoparaffins is 38-45% by mass, the content of C7 aroma is 10-20% by mass, the total aroma content is 30-40% by mass, and / or the distillation temperature is 50%. 85-95 ° C.
[0008]
The method for producing an unleaded gasoline composition according to the present invention is a fraction obtained by extracting an aroma component from a catalytic reformed gasoline base material, and an aroma extraction residue having a 90% distillation temperature of 100 ° C. or less and 40% by mass or more, 10 A heavy reformed gasoline fraction having a% distillation temperature of 150 ° C. or higher is blended with 20% by mass or more, and a catalytic cracking gasoline base is blended with 20% by mass or less, or is not blended.
[0009]
Preferably, the aroma extract residue has an aroma content of 0 to 2 mass%, a 90% distillation temperature of 70 to 95 ° C, and / or a blending amount of 45 to 55 mass%. Preferably, the heavy reforming fraction has a 10% distillation temperature of 150 to 180 ° C, an aroma content of 90 to 100% by mass, and / or a blending amount of 45 to 55% by mass. is there.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
[Octane number]
The research octane number (hereinafter also referred to as RON) of the unleaded gasoline composition according to the present invention is 89 to 93. RON can be measured by the research method octane number test method of JIS K 2280. If RON is higher than this range, performance improvement commensurate with the cost increase associated with gasoline production cannot be obtained, and the distilling property of gasoline becomes distorted due to the diversion of a high RON base material, while it is too low. In particular, it is not preferable because it becomes easy to knock during climbing acceleration.
[0011]
[Sulfur content]
The sulfur content of the unleaded gasoline composition according to the present invention is 10 ppm or less, preferably 5 ppm or less. Sulfur content can be measured by the microcoulometric titration method of JIS K 2541 "Crude oil and petroleum products-sulfur content test method".
[0012]
[Olefin content]
The olefin content of the unleaded gasoline composition according to the present invention is 5% by mass or less, preferably 3% by mass or less. Moreover, content of a C5-C7 olefin is 3 mass% or less, Preferably it is 2 mass% or less. In addition, the olefin content, paraffin content, and aroma content in the present invention can be measured by an all-component test method using gas chromatography in JIS K 2536 “Petroleum products—component test method”.
[0013]
Of the hydrocarbon compounds contained in the unleaded gasoline composition, those having an aromatic ring are classified as aroma, those having an unsaturated bond other than aroma are classified as olefins, and the others are paraffins. Among paraffins, those having a branch are defined as isoparaffins.
[0014]
[Paraffin content]
The content of isoparaffin having 5 to 7 carbon atoms of the unleaded gasoline composition according to the present invention is 35% by mass or more, preferably 38 to 45% by mass, and the paraffin content (saturated content) is preferably 50 to 85% by mass. .
[0015]
[Aroma content]
In the unleaded gasoline composition according to the present invention, the content of C7 aroma is 10% by mass or more, preferably 11 to 25% by mass. The total aroma content is 40% by mass or less, preferably 30 to 40% by mass, and the benzene content is preferably 1.0% by volume or less.
[0016]
[Distillation properties]
In the unleaded gasoline composition according to the present invention, the 50% distillation temperature is 100 ° C. or less, preferably 85 to 95 ° C., the 10% distillation temperature is preferably 50 to 60 ° C., and the 97% distillation temperature is 168 to 178. ° C is preferred.
[0017]
[Aroma extraction residue]
This is a fraction obtained by extracting an aroma component from a catalytic reforming gasoline base material, and a 90% distillation temperature is 100 ° C. or lower. The preferred properties of this fraction are a saturated content (paraffin content) of 90% by mass or more, an aroma content and an olefin content of 5% by mass or less, a 10% distillation temperature of 45 to 65 ° C., and a 90% content. Out temperature is 90-100 degreeC. It is preferable to blend such an aroma extract residue into an unleaded gasoline composition in an amount of 40% by mass or more, particularly 45 to 60% by mass.
[0018]
[Heavy reformed gasoline fraction]
The heavy reformed gasoline fraction is a relatively heavy fraction of a catalytically reformed gasoline base material mainly composed of a hydrocarbon having 9 carbon atoms, and has a 10% distillation temperature of 150 ° C. or higher, preferably It is the fraction which is 155-170 degreeC. This fraction preferably contains 90% by mass or more, particularly 95% by mass or more of the aroma content, and 90% distillation temperature is preferably 165 to 175 ° C. It is preferable to blend such heavy reformed gasoline fraction into an unleaded gasoline composition in an amount of 20% by mass or more, particularly 20 to 30% by mass.
[0019]
[Catalytic cracking gasoline base material]
In the unleaded gasoline composition according to the present invention, the catalytic cracking gasoline base material is not substantially blended. If blended, it is 20% by mass or less, and preferably 5% by mass or less. The process for producing the catalytic cracking gasoline base material does not particularly limit the catalytic cracking apparatus, the feedstock oil, and the operating conditions, and any known production process can be adopted. The catalytic cracking unit uses a catalyst such as amorphous silica alumina, zeolite, etc., in addition to petroleum fractions from light oil to vacuum gas oil, while being obtained from heavy oil indirect desulfurization unit, it can be obtained directly from degassing oil or heavy oil direct desulfurization unit. This is a device that obtains a high octane gasoline base material by catalytic cracking of degassed oil, atmospheric residue oil and the like. For example, UOP catalytic cracking method, flexi cracking method, ultra-orthoflow method, fluid catalytic cracking method such as Texaco fluid catalytic cracking method, RCC method, HOC method, etc. Examples include fluid catalytic cracking.
[0020]
Other gasoline base materials include (i) straight-run naphtha obtained by atmospheric distillation of crude oil, (ii) desulfurized naphtha obtained by desulfurizing straight-run naphtha, and (iii) a reaction of a lower olefin and isobutane in the presence of an acid catalyst. (Iv) Isomerates obtained by contact treatment with light naphtha and isomerization to increase octane number, and (v) precision distillation of LPG fraction and light naphtha recovered from crude oil and various secondary refining equipment Butane, isopentane, toluene and the like, which can be appropriately selected and mixed at an appropriate ratio to produce the unleaded gasoline composition of the present invention. The blending amount of these gasoline base materials is 10 to 40% by mass, particularly 15 to 30% by mass, based on the total amount of the unleaded gasoline composition.
[0021]
Further, a gasoline base material made of an oxygen-containing compound such as methyl tertiary butyl ether, ethyl tertiary butyl ether, tertiary amyl methyl ether, ethanol or methanol can also be used. The blending amount of these base materials is arbitrary as long as it does not depart from the gist of the present invention. However, when blending an oxygen-containing compound, the blending amount is preferably about 1 to 20% by volume.
[0022]
The unleaded gasoline composition of the present invention can be blended with known fuel additives as required. Although these compounding quantities can be selected suitably, it is usually preferable to set it as 0.1 mass% or less as a total amount of an additive. Examples of additives that can be used in the lead-free gasoline composition of the present invention include amine-based, phenol-based, aminophenol-based antioxidants, Schiff-type compounds, thioamide-type compounds such as metal deactivators, organic phosphorus Surface ignition preventives such as organic compounds, detergent dispersants such as succinimides, polyalkylamines and polyetheramines, anti-icing agents such as polyhydric alcohols and their ethers, alkali metal salts and alkaline earth metal salts of organic acids , Auxiliary alcohols such as sulfates of higher alcohols, anionic surfactants, cationic surfactants, antistatic agents such as amphoteric surfactants, rust inhibitors such as alkenyl succinates, discriminating agents such as quinizarin and coumarins And colorants such as azo dyes.
[0023]
【Example】
Hereinafter, the present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to these examples.
[0024]
Table 1 shows the properties of the catalytically cracked gasoline base, the aroma extraction residue, the light naphtha fraction, and the heavy reformed fraction used in the production of the unleaded gasoline compositions of Examples and Comparative Examples. The catalytic cracking gasoline base material was obtained by catalytic cracking of desulfurized heavy fuel oil having a sulfur content of 0.29% by mass. The aroma extraction residue is the remaining fraction obtained by solvent extraction of the aroma from the catalytically modified gasoline base material. Light naphtha is a fraction obtained by hydrorefining straight-run naphtha to reduce sulfur content. The heavy reformed gasoline fraction is a relatively heavy fraction of the catalytic reformed gasoline base material and mainly contains a hydrocarbon having 9 carbon atoms.
[0025]
The density (15 ° C) is the vibration type density test method of JIS K 2249 “Crude oil and petroleum products – Density test method and density / mass / capacity conversion table”, and the distillation properties are JIS K 2254 “Petroleum product – Distillation test method”. Atmospheric pressure distillation test method (loss addition), benzene content is JIS K 2536 tandem gas chromatographic component test method, lead method vapor pressure is JIS K 2258, sulfur content is JIS K 2541 "Crude oil and petroleum products" The RON was determined by the research method octane number test method of JIS K 2280 by the microcoulometric titration oxidation method of “Sulfur content test method”.
[0026]
[Table 1]
Figure 0003945768
[0027]
Using the gasoline base material of Table 1, the unleaded gasoline composition shown in Example 1 and Comparative Examples 1 and 2 was prepared at the blending ratio shown in Table 2. The properties of the unleaded gasoline compositions shown in Example 1 and Comparative Examples 1 and 2 prepared are shown together in Table 2. Furthermore, as additives, colorant (CL-53 made by Shirad Chemical) 2 mg / l, antioxidant (Sumilyzer 4ML made by Sumitomo Chemical Co., Ltd.) 20 mg / l, detergent dispersant (Keropur AP-95 made by BASF) 100 mg / l l was added.
[0028]
[Table 2]
Figure 0003945768
[0029]
In the actual vehicle, knocking generation rotation speed range and acceleration time were evaluated for unleaded gasoline shown in Example 1 and Comparative Examples 1 and 2. The evaluation results are summarized in Table 3. From this result, it can be seen that knocking occurred in Example 1 in the rotational speed range comparable to or lower than those of Comparative Examples 1 and 2, and has practically sufficient anti-knocking characteristics in an actual vehicle. Furthermore, Example 1 is superior to Comparative Examples 1 and 2 in acceleration, and it can be seen that driving performance in an actual vehicle is superior.
[0030]
[Table 3]
Figure 0003945768
[0031]
The method for measuring the knocking rotation speed range follows the ONR test method of the Japan Petroleum Institute. As for the transmission vehicle, the speed is reduced by a brake from a speed higher than 1000 rotations from the acceleration start speed at the highest gear position, and the throttle valve is fully opened at 1000 rotations. The acceleration time was measured by accelerating from 30 km / h to 120 km / h by delayed acceleration so as not to shift down, and measuring the time required to reach the maximum speed.
[0032]
About the vehicle used, Starlet is Toyota Motor Corporation, 1997 model, model / model code: E-EP91, engine type: 4E-FE, Primera is Nissan Motor Co., Ltd., 1997 model, model / model code: E-EP11, engine type: SR18DE, and Mirage is manufactured by Mitsubishi Motors, 1997 type, model / model code: E-CK2A, engine type: 4G15.
[0033]
【The invention's effect】
The lead-free gasoline composition according to the present invention has a research octane number of 89 to 93, a sulfur content of 5 mass ppm or less, an olefin content of 5 mass% or less, and a C 5-7 olefin content of 3 mass% or less. The content of isoparaffin having 5 to 7 carbon atoms is 353 mass% or more, the content of aroma having 7 carbon atoms is 10 mass% or more, the total aroma content is 40 mass% or less, and the 50% distillation temperature is 100%. In accordance with the present invention, it is a fuel that sufficiently reduces sulfur content and olefin content and is environmentally friendly, and at the same time provides comprehensive good drivability when used in an actual gasoline vehicle. it can.

Claims (2)

リサーチ法オクタン価が89〜93であり、硫黄分が10質量ppm以下、オレフィン分が5質量%以下、炭素数5〜7のオレフィンの含有量が3質量%以下、炭素数5〜7のイソパラフィンの含有量が35質量%以上、炭素数7のアロマの含有量が10質量%以上であり、全アロマ含有量が40質量%以下、および50%留出温度が100℃以下である無鉛ガソリン組成物。The octane number of the research method is 89 to 93, the sulfur content is 10 mass ppm or less, the olefin content is 5 mass% or less, the content of olefin having 5 to 7 carbon atoms is 3 mass% or less, and the isoparaffin having 5 to 7 carbon atoms. Unleaded gasoline composition having a content of 35% by mass or more, a C7 aroma content of 10% by mass or more, a total aroma content of 40% by mass or less, and a 50% distillation temperature of 100 ° C. or less. . 接触改質ガソリン基材からアロマ分を抽出した留分であり90%留出温度が100℃以下であるアロマ抽出残留分40質量%以上と、10%留出温度が150℃以上である重質改質ガソリン留分20質量%以上とを配合し、接触分解ガソリン基材を20質量%以下配合するか、または配合しない無鉛ガソリン組成物の製造方法。Aromatic fraction extracted from catalytic reforming gasoline base material, 90% distillation temperature is 100 ° C or less, aroma extraction residue is 40 mass% or more, and 10% distillation temperature is 150 ° C or more heavy A method for producing an unleaded gasoline composition containing 20% by mass or more of a reformed gasoline fraction and 20% by mass or less of a catalytic cracking gasoline base.
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