JP5000875B2 - Method for producing fuel oil composition - Google Patents
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- JP5000875B2 JP5000875B2 JP2005286439A JP2005286439A JP5000875B2 JP 5000875 B2 JP5000875 B2 JP 5000875B2 JP 2005286439 A JP2005286439 A JP 2005286439A JP 2005286439 A JP2005286439 A JP 2005286439A JP 5000875 B2 JP5000875 B2 JP 5000875B2
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Description
本発明は、色相を改良した燃料油組成物、特にＡ重油の製造方法に関するものである。 The present invention relates to a method for producing a fuel oil composition having improved hue, particularly A heavy oil.
周知のとおり、原油を蒸留して得られる留分の中で、石油中間留出油と呼ばれる、沸点が１００〜４５０℃の範囲の留分は、灯油、軽油、Ａ重油等の各種燃料源として大量に消費されている。この石油中間留出油、特に、灯油及び軽油留分に、残留炭素付与材としてエキストラクト及び低温流動性向上剤を配合して、燃料油組成物、特にＡ重油を製造することが行われている。
例えば、特許文献１では、Ａ重油基油に対し、常圧残油、減圧残油、脱硫残油、スラリーオイルおよびエキストラクトから選ばれる１種あるいは２種以上の炭化水素油を、Ａ重油最終製品中の１０％残留炭素分が０.２質量％以上、アスファルテン分が２００質量ppm以下及び−１０℃におけるワックス含有量が０.１〜５.０質量％となるように添加し、かつ流動性向上剤を１００〜１０００容量ｐｐｍとなるように添加してなる低温流動性燃料油組成物が提案されている。
また、特許文献２では、水素化分解軽油およびエキストラクトを用いて得られるＡ重油 組成物が開示されている。
しかしながら、これらのエキストラクトを用いる方法は、エキストラクトが貯蔵中に酸化劣化することにより、製品である燃料油組成物、特にＡ重油の色相が悪化する問題がある。
そこで、エキストラクトを有効に用いながら、色相が改善された燃料油組成物の製造方法が望まれていた。
ところで、簡便な食用油や潤滑油の酸化劣化防止方法として、食用油等に不活性ガスを注入し、該油中で前記不活性ガスを微細な気泡にして混合分散させることにより、油中の酸素の脱酸素を行い、また油と酸素との接触を抑制して酸化を抑止せんとする方法が提案されている（特許文献３参照）。
しかし、貯蔵中のエキストラクトに不活性ガスを注入して、酸化劣化を防止せんとする試みは、今までなされていなかったのが実情である。
As is well known, among the fractions obtained by distilling crude oil, fractions having boiling points in the range of 100 to 450 ° C., called petroleum middle distillates, are used as various fuel sources such as kerosene, light oil, and heavy oil A. A large amount is consumed. This petroleum middle distillate, in particular, kerosene and light oil fractions, is mixed with an extract and a low temperature fluidity improver as a residual carbon imparting material to produce a fuel oil composition, particularly A heavy oil. Yes.
For example, in Patent Document 1, one or two or more hydrocarbon oils selected from normal pressure residual oil, reduced pressure residual oil, desulfurized residual oil, slurry oil, and extract are used for A heavy oil base oil. Add 10% residual carbon in the product to 0.2 mass% or more, asphaltene content to 200 massppm or less, and wax content at -10 ° C to 0.1 to 5.0 mass%, and flow A low-temperature fluid fuel oil composition obtained by adding a property improver to 100 to 1000 ppm by volume has been proposed.
Patent Document 2 discloses a heavy oil A composition obtained by using hydrocracked light oil and an extract.
However, the method using these extracts has a problem that the hue of the fuel oil composition as a product, particularly A fuel oil, deteriorates due to the oxidative degradation of the extract during storage.
Therefore, a method for producing a fuel oil composition with improved hue while using the extract effectively has been desired.
By the way, as a simple method for preventing oxidative deterioration of edible oils and lubricating oils, an inert gas is injected into edible oil and the like, and the inert gas is mixed and dispersed in the oil as fine bubbles. A method has been proposed in which oxygen is deoxygenated and the contact between oil and oxygen is suppressed to prevent oxidation (see Patent Document 3).
However, in reality, no attempt has been made to prevent oxidative degradation by injecting an inert gas into the extract during storage.
本発明は、このような状況下で、エキストラクトを用いながら、色相が改善された燃料油組成物、特にＡ重油の製造方法を提供することを目的とするものである。 An object of the present invention is to provide a method for producing a fuel oil composition, particularly A heavy oil, having improved hue while using an extract under such circumstances.
本発明者らは、前記目的を達成するために鋭意研究を重ねた結果、特定圧力の不活性ガス雰囲気によるエキストラクトの酸化劣化防止に着目し、本発明を完成した。
すなわち、本発明の要旨は下記のとおりである。
１． （１）不活性ガス圧力を一定に保持する貯蔵装置内でエキストラクトを貯蔵する段階と、（２）石油中間留出油に、燃料油組成物基準で、該エキストラクトを０．１〜５質量％配合する段階とを含むことを特徴とする燃料油組成物の製造方法。
２． 保持される不活性ガス圧力が１０００〜１０３０ｈＰａである上記１に記載の燃料油組成物の製造方法。
３． 不活性ガスが窒素である上記１又は２に記載の燃料油組成物の製造方法。
４． 貯蔵装置が不活性ガスの供給又は排出を自動制御する手段を具備してなる上記１〜３のいずれかに記載の燃料油組成物の製造方法。
５． 石油中間留出油の沸点範囲が１００〜４５０℃である上記１〜４のいずれかに記載の燃料油組成物の製造方法。
６． 不活性ガスの供給が、貯蔵装置内のエキストラクトに不活性ガスを直接吹き込むことによりなされる上記１〜５のいずれかに記載の燃料油組成物の製造方法。
７． 燃料油組成物がＡ重油である上記１〜６のいずれかに記載の燃料油組成物の製造方法。
As a result of intensive studies to achieve the above object, the present inventors have completed the present invention by paying attention to preventing oxidative degradation of the extract under an inert gas atmosphere at a specific pressure.
That is, the gist of the present invention is as follows.
1. (1) a step of storing the extract in a storage device that keeps the inert gas pressure constant; (2) the extract is added to the petroleum middle distillate in an amount of 0.1 to 5 based on the fuel oil composition. A method for producing a fuel oil composition comprising the step of blending by mass%.
2. 2. The method for producing a fuel oil composition according to 1 above, wherein the inert gas pressure to be maintained is 1000 to 1030 hPa.
3. 3. The method for producing a fuel oil composition as described in 1 or 2 above, wherein the inert gas is nitrogen.
4). 4. The method for producing a fuel oil composition according to any one of 1 to 3, wherein the storage device comprises means for automatically controlling supply or discharge of the inert gas.
5. The method for producing a fuel oil composition according to any one of the above 1 to 4, wherein the boiling range of the petroleum middle distillate is 100 to 450 ° C.
6). 6. The method for producing a fuel oil composition as described in any one of 1 to 5 above, wherein the inert gas is supplied by directly blowing the inert gas into the extract in the storage device.
7). 7. The method for producing a fuel oil composition according to any one of 1 to 6, wherein the fuel oil composition is A heavy oil.
本発明により、エキストラクトを用いながら、色相が改善された燃料油組成物、特にＡ重油の製造方法を提供することができる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for producing a fuel oil composition having improved hue while using an extract, particularly A fuel oil.
本発明方法における燃料油組成物は、Ａ重油、中間留分組成物等をいい、特にＡ重油をいう。そして、エキストラクトとは、原油の常圧蒸留残渣油を減圧蒸留して得られる中質・重質の減圧蒸留留出油（潤滑油原料用）あるいは減圧蒸留残渣油の脱歴油（ブライトストック油）をフルフラール等で留出分離した、高芳香族分の抽出油であって、具体的には、その性状として、１５℃の密度が０．９５〜１．０５ｇ／ｃｍ3、１００℃における動粘度が５〜１００ｍｍ2／ｓ、硫黄分が０．５〜５．０質量％である。
エキストラクトは、石油中間留出油に、燃料油組成物基準で、０．１〜５質量％配合されるが、好ましくは、０．２〜２．０質量％、さらに好ましくは、０．３〜１．０質量％である。０．１質量％未満では、１０％残油残炭分が０．２１質量％以上となるのが困難であり、５質量％を超えれば、１０％残油残炭分が高くなり過ぎて色相が悪化し、スラッジが発生する等の問題を引き起こす可能性がある。
The fuel oil composition in the method of the present invention refers to A heavy oil, middle distillate composition, etc., and particularly refers to A heavy oil. The extract is a medium / heavy vacuum distillation distillate (for lubricating oil feedstock) obtained by subjecting a crude oil atmospheric distillation residue to vacuum distillation, or a history oil (Brightstock) Oil), a highly aromatic extract oil obtained by distilling and separating the residue with furfural or the like. Specifically, the oil has a density of 0.95 to 1.05 g / cm 3 at 100 ° C. at 100 ° C. The kinematic viscosity is 5 to 100 mm 2 / s, and the sulfur content is 0.5 to 5.0 mass%.
The extract is blended with petroleum middle distillate in an amount of 0.1 to 5% by mass based on the fuel oil composition, preferably 0.2 to 2.0% by mass, more preferably 0.3. It is -1.0 mass%. If it is less than 0.1% by mass, it will be difficult for the residual carbon content of 10% to be 0.21% by mass or more, and if it exceeds 5% by mass, the residual carbon content of 10% will be too high. May worsen and cause problems such as sludge generation.
また、石油中間留出油の沸点範囲が１４０〜５００℃であることが好ましい。石油中間留出油の具体例としては、軽質直留軽油（ＬＧＯ），軽質脱硫軽油（ＤＧＯ），重質直留軽油（ＨＧＯ），接触分解軽油（ＬＣＯ），直接脱硫軽油（ＤＳＧＯ），間接脱硫軽油（ＶＨＬＧＯ），水素化分解軽油（ＨＣＧＯ），灯油（ＫＥＲＯ）等の各基材を挙げることができ、これらを単独であるいは組み合わせて使用することができる。上記各基材については通常の方法で調製することができ、またその性状としては下記に示すものを一般に使用可能である。
基材 沸点範囲(℃)
ＬＧＯ １４０ 〜３９０
ＤＧＯ １４０ 〜３９０
ＨＧＯ ２００ 〜６００
ＬＣＯ １４０ 〜３８０
ＤＳＧＯ １４０ 〜４００
ＶＨＬＧＯ １４０ 〜３９０
ＨＣＧＯ １４０ 〜３９０
ＫＥＲＯ １４０ 〜２８０
Moreover, it is preferable that the boiling range of petroleum middle distillate is 140-500 degreeC. Specific examples of petroleum middle distillates include light straight-run light oil (LGO), light desulfurized light oil (DGO), heavy straight-run light oil (HGO), catalytic cracking light oil (LCO), direct desulfurized light oil (DSGO), and indirect. Examples of the base material include desulfurized light oil (VHLGO), hydrocracked light oil (HCGO), and kerosene (KERO). These can be used alone or in combination. About each said base material, it can prepare by a normal method and the thing shown below as a property can generally be used.
Base material Boiling range (℃)
LGO 140-390
DGO 140-390
HGO 200-600
LCO 140-380
DSGO 140-400
VHLGO 140-390
HCGO 140-390
KERO 140-280
さらに、本発明方法の燃料油組成物には、好ましくは、燃料油組成物基準で、流動性向上剤が０．００１〜０．１質量％配合されるが、より好ましくは、０．００５〜０．０５質量％、さらに好ましくは、０．０１〜０．０３質量％である。０．００１質量％以上であれば、流動性向上効果を享受することができ、０．１質量％以下であるのが経済的に有利である。
流動性向上剤としては、市販のものをはじめ各種流動性向上剤を使用することができ、特に制限はないがエチレン−酢酸ビニル共重合体等のエチレン−飽和カルボン酸ビニルエステル共重合体、エチレン−エチレン性不飽和エステル共重合体に代表されるポリマータイプ、あるいは長鎖ジカルボン酸アミドに代表される油溶性分散剤タイプが好ましい。
Furthermore, the fuel oil composition of the present invention preferably contains 0.001 to 0.1% by mass of a fluidity improver based on the fuel oil composition, but more preferably 0.005 to It is 0.05 mass%, More preferably, it is 0.01-0.03 mass%. If it is 0.001 mass% or more, the fluidity improvement effect can be enjoyed, and it is economically advantageous that it is 0.1 mass% or less.
As the fluidity improver, various fluidity improvers including commercially available ones can be used. Although there is no particular limitation, an ethylene-saturated carboxylic acid vinyl ester copolymer such as an ethylene-vinyl acetate copolymer, ethylene, etc. -A polymer type represented by an ethylenically unsaturated ester copolymer or an oil-soluble dispersant type represented by a long-chain dicarboxylic acid amide is preferred.
本発明方法における燃料油組成物には、必要に応じてセタン価向上剤、酸化防止剤、金属不活性剤、氷結防止剤、腐食防止剤、微生物殺菌剤、助燃剤、帯電防止剤、潤滑性付加剤、着色剤等の添加剤を適宜加えることができる。 In the fuel oil composition in the method of the present invention, a cetane number improver, an antioxidant, a metal deactivator, an anti-icing agent, a corrosion inhibitor, a microbial disinfectant, an auxiliary agent, an antistatic agent, and a lubricity, as necessary. Additives such as additives and colorants can be added as appropriate.
本発明方法においては、まず、不活性ガス圧力を一定に保持する貯蔵装置内でエキストラクトを貯蔵する段階を要する。この不活性ガス圧力は１０００〜１０３０ｈＰａであることが好ましく、１０１０〜１０２０ｈＰａであることがさらに好ましい。１０００ｈＰａ以上であれば、エキストラクトの劣化防止に効果があって色相も良好となり、減圧による貯蔵装置の強度耐性にも問題ない。また、１０３０ｈＰａ以下であれば、加圧による貯蔵装置の強度耐性に問題なく、不活性ガス消費を節減でき、経済的に有利である。 In the method of the present invention, first, a step of storing the extract in a storage device that keeps the inert gas pressure constant is required. The inert gas pressure is preferably 1000 to 1030 hPa, and more preferably 1010 to 1020 hPa. If it is 1000 hPa or more, it will be effective in preventing the deterioration of the extract, the hue will be good, and there will be no problem with the strength resistance of the storage device due to reduced pressure. Moreover, if it is 1030 hPa or less, there will be no problem in the intensity | strength tolerance of the storage apparatus by pressurization, an inert gas consumption can be reduced, and it is economically advantageous.
タンク等の貯蔵装置内の不活性ガス圧力を一定に保持する手段としては、貯蔵装置内に圧力センサを設置して、このセンサ情報と、供給弁及び排気弁の開閉とをコンピュタにより連動させる自動制御により圧力保持させてもよいし、圧力の変動により弁が自動的かつ機械的に開閉するガスシール・ユニット及び／又はブリザーバルブを設置して、不活性ガス圧力を一定に自動制御してもよい。
不活性ガスは貯蔵装置の上部の空気層に供給されてもよいが、貯蔵装置内のエキストラクト中に供給されると、より迅速にエキストラクト中の酸素を排除することができるので、より好ましい。
As a means to keep the inert gas pressure in a storage device such as a tank constant, a pressure sensor is installed in the storage device, and this sensor information is automatically linked with the opening and closing of the supply valve and exhaust valve by a computer. The pressure may be maintained by control, or a gas seal unit and / or a blister valve that automatically and mechanically opens and closes due to pressure fluctuations may be installed to automatically control the inert gas pressure to a constant level. Good.
Inert gas may be supplied to the air layer at the top of the storage device, but it is more preferable if it is supplied into the extract in the storage device because oxygen in the extract can be eliminated more quickly. .
不活性ガスは、窒素、ヘリウム、ネオン、アルゴン、キセノン等のいずれでもよいが、コストが安く取り扱いが容易な窒素が好ましい。
窒素源としては、石油コンビナートで副生されるコンビナート窒素を用いてもよいし、各種窒素発生装置から発生する窒素を用いてもよい。
各種窒素発生装置の窒素発生方法は、膜分離法、ＰＳＡ（Ｐｒｅｓｓｕｒｅ Ｓｗｉｎｇ Ａｄｓｏｒｐｔｉｏｎ）法（ゼオライト等の吸着材を用いた吸着分離法）のほかに、空気を−２００℃まで冷却し、沸点の差を利用して酸素と窒素を分離する方法である深冷分離法等が知られているが、小規模な設備で稼動でき、運転費用も安価な膜分離法が好ましい。
The inert gas may be any of nitrogen, helium, neon, argon, xenon, etc., but nitrogen is preferable because it is inexpensive and easy to handle.
As a nitrogen source, complex nitrogen by-produced in a petroleum complex may be used, or nitrogen generated from various nitrogen generators may be used.
Nitrogen generation methods of various nitrogen generators include membrane separation method and PSA (Pressure Swing Adsorption) method (adsorption separation method using adsorbent such as zeolite), as well as cooling the air to -200 ° C, and the difference in boiling point A cryogenic separation method, which is a method for separating oxygen and nitrogen by using methane, is known, but a membrane separation method which can be operated with a small-scale facility and has low operating costs is preferable.
次に、本発明を実施例により、さらに詳細に説明するが、本発明は、これらの例によってなんら限定されるものではない。
なお、色相及び沸点範囲を、下記の方法に従って測定した。
１．色相
ＪＩＳ Ｋ ２５８０−１９９３の参考１・石油製品の色試験方法（刺激値換算法）７．２に従って、ＡＳＴＭ色相を測定した。
２．沸点範囲
ＡＳＴＭ Ｄ２８８７「石油留分のガスクロマトグラフィー法蒸留試験方法」に準拠して測定した。
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
The hue and boiling range were measured according to the following method.
1. Hue ASTM hue was measured according to JIS K 2580-1993, Reference 1 Petroleum product color test method (stimulus value conversion method) 7.2.
2. Boiling range: Measured according to ASTM D2887 “Gas chromatography distillation test method for petroleum fractions”.
実施例１
窒素ガス圧力が１０１４．３ｈＰａに保持された貯蔵装置内でエキストラクトを２００日間貯蔵した後、沸点範囲が１４０〜３３０℃である接触分解軽油（ＬＣＯ）及び沸点範囲が１４０〜２８０℃である灯油（ＫＥＲＯ）をそれぞれ等量（容積基準）含有する石油中間留出油に、燃料油組成物基準で、上記のエキストラクトを０．５質量％配合し、燃料油組成物としてのＡ重油を得た。色相は、１．６であった。
Example 1
After the extract is stored for 200 days in a storage device maintained at a nitrogen gas pressure of 1014.3 hPa, catalytic cracked light oil (LCO) having a boiling range of 140-330 ° C and kerosene having a boiling range of 140-280 ° C The petroleum middle distillate containing the same amount (KERO) (volume basis) is blended with 0.5% by mass of the above extract on the basis of the fuel oil composition to obtain A heavy oil as the fuel oil composition. It was. The hue was 1.6.
実施例２
窒素ガス圧力が１０１４．３ｈＰａに保持された貯蔵装置内で実施例１と同じエキストラクトを２００日間貯蔵した後、沸点範囲が１７２〜３５７℃である軽質直留軽油（ＬＧＯ）と沸点範囲が１４０〜３３０℃である接触分解軽油（ＬＣＯ）とを７５／２５の容積比で含有する石油中間留出油に、燃料油組成物基準で、上記のエキストラクトを０．５質量％配合し、燃料油組成物としてのＡ重油を得た。色相は、１．６であった。
Example 2
After storing the same extract as in Example 1 for 200 days in a storage device maintained at a nitrogen gas pressure of 1014.3 hPa, light straight-run gas oil (LGO) having a boiling range of 172 to 357 ° C. and a boiling range of 140 A petroleum middle distillate containing a catalytically cracked light oil (LCO) that is ˜330 ° C. in a volume ratio of 75/25 is blended in an amount of 0.5% by mass based on the fuel oil composition. A heavy oil as an oil composition was obtained. The hue was 1.6.
実施例３
窒素ガス圧力が１０１４．３ｈＰａに保持された貯蔵装置内で実施例１と同じエキストラクトを２００日間貯蔵した後、沸点範囲が１７２〜３５７℃である軽質直留軽油（ＬＧＯ）、沸点範囲が１４０〜３３０℃である接触分解軽油（ＬＣＯ）と沸点範囲が１５０〜３９０℃である間接脱硫軽油（ＶＨＬＧＯ）とを６５／２５／１０の容積比で含有する石油中間留出油に、燃料油組成物基準で、上記のエキストラクトを０．５質量％配合し、燃料油組成物としてのＡ重油を得た。色相は、１．８であった。
Example 3
After storing the same extract as in Example 1 for 200 days in a storage device maintained at a nitrogen gas pressure of 1014.3 hPa, light straight-run gas oil (LGO) having a boiling range of 172 to 357 ° C., a boiling range of 140 A fuel oil composition containing petroleum cracked gas oil (LCO) having a boiling point range of 150 to 390 ° C and an indirect desulfurized gas oil (VHLGO) having a boiling range of 150 to 390 ° C in a volume ratio of 65/25/10. Based on physical standards, 0.5% by mass of the above extract was blended to obtain A heavy oil as a fuel oil composition. The hue was 1.8.
比較例１
空気圧力が１０１４．３ｈＰａに保持された貯蔵装置内で実施例１と同じエキストラクトを２００日間貯蔵した後、沸点範囲が１４０〜３３０℃である接触分解軽油（ＬＣＯ）及び沸点範囲が１４０〜２８０℃である灯油（ＫＥＲＯ）をそれぞれ等量（容積基準）含有する石油中間留出油に、燃料油組成物基準で、上記のエキストラクトを０．５質量％配合し、燃料油組成物としてのＡ重油を得た。色相は、３．１であった。
Comparative Example 1
After storing the same extract as in Example 1 for 200 days in a storage device maintained at an air pressure of 1014.3 hPa, catalytic cracked light oil (LCO) having a boiling range of 140-330 ° C. and a boiling range of 140-280 A petroleum middle distillate containing an equal amount of kerosene (KERO) at 0 ° C. (volume basis) is blended in an amount of 0.5% by mass of the above extract on the basis of the fuel oil composition. A heavy oil was obtained. The hue was 3.1.
比較例２
空気圧力が１０１４．３ｈＰａに保持された貯蔵装置内で実施例１と同じエキストラクトを２００日間貯蔵した後、沸点範囲が１７２〜３５７℃である軽質直留軽油（ＬＧＯ）と沸点範囲が１４０〜３３０℃である接触分解軽油（ＬＣＯ）とを７５／２５の容積比で含有する石油中間留出油に、燃料油組成物基準で、上記のエキストラクトを０．５質量％配合し、燃料油組成物としてのＡ重油を得た。色相は、３．５であった。
Comparative Example 2
After storing the same extract as Example 1 for 200 days in a storage device maintained at an air pressure of 1014.3 hPa, light straight-run gas oil (LGO) having a boiling range of 172 to 357 ° C. and a boiling range of 140 to The petroleum middle distillate containing catalytic cracking light oil (LCO) at 330 ° C. in a volume ratio of 75/25 is blended with 0.5% by mass of the above extract on the basis of the fuel oil composition. A heavy oil as a composition was obtained. The hue was 3.5.
比較例３
空気圧力が１０１４．３ｈＰａに保持された貯蔵装置内で実施例１と同じエキストラクトを２００日間貯蔵した後、沸点範囲が１７２〜３５７℃である軽質直留軽油（ＬＧＯ）、沸点範囲が１４０〜３３０℃である接触分解軽油（ＬＣＯ）と沸点範囲が１５０〜３９０℃である間接脱硫軽油（ＶＨＬＧＯ）とを６５／２５／１０の容積比で含有する石油中間留出油に、燃料油組成物基準で、上記のエキストラクトを０．５質量％配合し、燃料油組成物としてのＡ重油を得た。色相は、３．５であった。
Comparative Example 3
After storing the same extract as in Example 1 for 200 days in a storage device maintained at an air pressure of 1014.3 hPa, light straight-run gas oil (LGO) having a boiling range of 172 to 357 ° C., a boiling range of 140 to A fuel oil composition containing petroleum cracked gas oil (LCO) having a temperature of 330 ° C. and indirect desulfurized gas oil (VHLGO) having a boiling range of 150 to 390 ° C. in a volume ratio of 65/25/10. On the basis, 0.5% by mass of the above extract was blended to obtain A heavy oil as a fuel oil composition. The hue was 3.5.
実施例１と比較例１との比較、実施例２と比較例２との比較及び実施例３と比較例３との比較により明らかなごとく、本発明方法により、燃料油組成物の色相がＡＳＴＭ色相で２以下となり、色相が大幅に改善された。 As apparent from the comparison between Example 1 and Comparative Example 1, the comparison between Example 2 and Comparative Example 2, and the comparison between Example 3 and Comparative Example 3, the method of the present invention allows the hue of the fuel oil composition to be changed to ASTM. The hue was 2 or less, and the hue was greatly improved.
本発明方法により色相が大幅に改善されるので、各種燃料油組成物、特にＡ重油の製造方法として好適に用いられる。 Since the hue is greatly improved by the method of the present invention, it is suitably used as a method for producing various fuel oil compositions, particularly A heavy oil.
Claims (7)
（２）石油中間留出油に、燃料油組成物基準で、該エキストラクトを０．１〜５質量％配合する段階とを
含むことを特徴とする燃料油組成物の製造方法。 (1) In a storage device that keeps the inert gas pressure constant, a step of storing the extract using the gas in the storage device as an inert gas ;
(2) A method for producing a fuel oil composition comprising the step of blending 0.1 to 5% by mass of the extract with petroleum middle distillate based on the fuel oil composition.
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