KR101058120B1 - Identification method for petroleum products and identification agent for petroleum products used therein - Google Patents

Abstract

The present invention relates to a method for identifying a petroleum product comprising measuring the absorbance of a petroleum product labeled with an petroleum product identifier comprising an alkyl ether phenolphthalein derivative, and to a petroleum product identifier used therein. Disclosed are a method for identifying a petroleum product and a petroleum product identification agent for use in which the petroleum product can be clearly identified by measuring the absorbance without the need.

Identification, Petroleum Products

Description

Identification method for petroleum products and identification agent for petroleum products used in the same {Method for Marking Oil Products and Marker for Oil Products Used Herein}

The present invention relates to a method for identifying a petroleum product and to a petroleum product identification agent used therein, which can clearly identify a petroleum product by measuring absorbance without using a coloring agent.

The identification product for petroleum products has been developed worldwide since the 1980s, and it prevents the environmental pollution caused by the use of illegal petroleum and the shortening of the life span of automobiles due to the rise in crude oil prices, and the use of pseudo gasoline. It is introduced to prevent illegal use of special purpose duty free oil.

In addition, due to the advancement of petroleum refining technology due to the development of petrochemical technology, a lot of costs are required to compete and maintain the quality of each refiner. Therefore, the company's identification system is introduced to verify the refiner's branding and quality maintenance. It was initially limited to kerosene and by-product oil, which are legal identification systems, but has since expanded from gasoline to diesel to LPG.

There are three types of identifiers.

In the first form, i) adding an aromatic substance containing a diazo group, adding an acid or a base to express color, or ii) adding an aromatic amine or phenols, and then adding diazonium. There is a method of extracting the material from petroleum (organic solution), qualitatively and quantitatively. Although the above methods are inexpensive and have excellent color development, they are difficult to measure mechanically and must be visually identified.

As a second method, a colorless reagent is added to the colorless reagent, and the color change reagent causes a phase change of the entire petroleum (organic solution).

As a third method, there is a method of quantitatively using a dye that absorbs light in the near infrared region. However, the price of the equipment used is very expensive, frequent breakdowns, poor solubility in petroleum, and precipitation may occur.

If the above-mentioned identification agent is added to petroleum products in a refinery or distribution process at a certain concentration, quantitative detection is possible in any process during distribution.If the concentration of the identification agent is applied or other detection methods are applied, the presence or absence of another company's product or You can check whether it is mixed with low-priced goods and duty-free goods.

In particular, identifiers are characterized by a clear distinction between chemically and physically identical or similar liquids. For example, the labeling of fuels is of importance because they need to be labeled with a clear brand name and grade in terms of stability as well as for commercial reasons. More emphasis has been given.

For example, coloring and labeling less taxed products can be distinguished from similarly taxed higher substances. Furthermore, dyeing or labeling certain fuels may confuse kerosene, stove oil, or diesel fuel with a moderate grade of gasoline, or deceive lower grade products made with a mixture of ordinary grades of gasoline with a high grade of gasoline as a high quality product. Can be prevented.

With such various backgrounds, the necessity of an excellent discriminating agent that is differentiated from the existing discriminating agent has been emphasized while satisfying the conditions to be provided as an identifying agent.

Therefore, in the embodiments of the present invention, not only the storage stability is excellent, but also the solubility is excellent, there is no fear of precipitation when introduced into the petroleum, and the price of the measuring device is also using a technique of applying a relatively low absorbance measuring device An object of the present invention is to provide a method for identifying a petroleum product and an identifier for a petroleum product, which can be used to enhance the identification effect of a petroleum product.

In order to achieve this object, the present invention provides a method for identifying a petroleum product comprising the step of measuring the absorbance of the petroleum product labeled with an petroleum product identifier comprising an alkyl ether phenolphthalein derivative of formula (1).

[Formula 1]

Wherein R is the same or different from one another and is hydrogen, substituted or unsubstituted C ₁ -C ₁₂ alkyl.

The present invention also provides an petroleum product identification agent used in the petroleum product identification method.

Furthermore, the present invention provides a method for preparing an petroleum product identifier comprising preparing a phenolphthalein salt and reacting an alkyl halide represented by the following formula (2).

[Formula 2]

(R-X)

Wherein R is substituted or unsubstituted C ₁ -C ₁₂ alkyl and X is Cl, Br or I.

According to the present invention, since the identification agent does not dissolve in the fuel and does not develop color, storage stability can be maintained, and by not including a colorant, the influence of the colorant concentration can be minimized to grasp the precise quantitative characteristics of the petroleum product.

Identifiers added to petroleum products and used for labeling shall have the following characteristics:

1. It must be fundamentally different from dyes.

2. High solubility in petroleum fuel and able to be in liquid form.

3. Even if a certain amount is added to petroleum, it should not have color.

4. It should be easy to extract from the labeled fuel.

5. The addition of fuel should not change the shape of the fuel.

6. It should be easy and simple to confirm by laboratory method.

However, the inventors of the present application, as in the conventional method for identifying petroleum products, when using a developer separately, do not have a problem of storage stability of the colorant, that is, excellent stability at room temperature, and in the petroleum product over time. It was confirmed that a problem of different concentrations of may occur. Accordingly, it was confirmed that not only can not be easily and simply confirmed by a laboratory method, but also may cause a problem that the identification of petroleum products is not accurate. However, the present invention provides a method for identifying petroleum products by measuring the absorbance without using a coloring agent.

Currently, the petroleum products identifiers used in Korea are imported from the United States and European countries, and no products are developed and used in Korea. Therefore, the import substitution effect and export increase effect are expected to be expanded by the localization of the petroleum product identification agent, which was dependent on the whole import, and it is possible to diversify the commercialization by using the present invention, thereby preventing product mixing among refiners. By encouraging the protection and reinforcement of the products of each refiner, we can expect the quality improvement through competition of petroleum products.

In addition, through the simple confirmation through the measuring device, the ability to control the site of unauthorized petroleum products can be strengthened to protect high-quality petroleum products, thereby preventing pollution of the exhaust gas and contributing to the protection of the atmospheric environment. High quality petroleum products are available. This contributes to the restoration of the reliability of the petroleum product market, and the use of high quality petroleum products enables the long-term use of automobiles for the protection of petroleum products, such as automotive engines.

The present invention relates to an petroleum product identifier comprising an alkyl ether phenolphthalein derivative of the general formula (1) used in the petroleum product identification method.

[Formula 1]

Wherein R is the same as or different from each other and is hydrogen or substituted or unsubstituted C ₁ -C ₁₂ alkyl.

The alkyl ether phenolphthalein derivative of Formula 1 is to convert the OH group of the phenolphthalein to an ether group, thereby eliminating the possibility of hydrogen bonding, thereby increasing the hydrophobic properties to increase the solubility in petroleum products.

This is a conventional acylation phenolphthalein O- (O- acylated phenolphthalein) and is a compound having a different chemical structure, in the case of using them to identify zero without the use of coloring agents, can clearly identify the petroleum products by measuring the absorbance have.

In one embodiment, R is substituted or unsubstituted C ₁ ~ C ₁₂ alkyl, depending on the carbon number butyl (-C ₄ H ₉ ), isobutyl ((CH ₃ ) ₂ CH ?? CH ₂ ??) , Isopentyl, benzyl, hexyl group, ethylhexyl, octyl or decyl. Specifically, the alkyl ether derivatives of phenolphthalein is 3,3-bis (4-isobutoxy-phenyl) - isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-isobutoxyphenyl ) isobenzofuran-1 (3 H) -one),

3,3-bis (4-butoxy-phenyl) - isopropyl-benzofuran -1 ((3 H) - one (3,3-bis (4-butoxyphenyl ) isobenzofuran-1 (3 H) -one),

3,3-bis (4-iso-pentyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-isopentyloxyphenyl ) isobenzofuran-1 (3 H) -one),

3,3-bis (4-hexyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-hexyloxyphenyl ) isobenzofuran-1 (3 H) -one),

3,3-bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 ( 3H ) -one (3,3-bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 (3 H ) -one),

3,3-bis (4-octyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-octyloxyphenyl ) isobenzofuran-1 (3 H) -one),

3,3-bis (4-dodecyl oxyphenyl) isopropyl benzofuran -1 (3 H) - one (3,3-bis (4-decyloxyphenyl ) isobenzofuran-1 (3 H) -one) and

3,3-bis (4-benzyloxyphenyl) isopropyl benzofuran -1 (3 H) - one (3,3-bis (4-benzyloxyphenyl ) isobenzofuran-1 (3 H) -one) one selected from the group consisting of Or two or more.

In one embodiment, the absorbance of the labeled petroleum product can be measured via a UV / VIS (Ultraviolet-visible spectroscopy) instrument. The labeled petroleum product may exhibit a maximum absorption wavelength at 240 to 282 nm when measured by a UV / VIS measuring device, wherein the absorbance may be 0.43 to 0.75. If it is confirmed that the absorbance measured at the maximum absorption wavelength within the above range is in the range of 0.43 to 0.75, the petroleum product is labeled with the identifier according to the present invention and can be distinguished from other petroleum products not labeled with the identifier.

In addition, the present invention relates to a method for preparing an petroleum product identifier comprising preparing a phenolphthalein salt and reacting an alkyl halide represented by the following formula (2).

[Formula 2]

(R-X)

Wherein R is substituted or unsubstituted C ₁ -C ₁₂ alkyl and X is Cl, Br or I.

The method for preparing an alkyl ether phenolphthalein derivative of Chemical Formula 1 may include, for example, reacting phenolphthalein with sodium hydroxide using methanol as a solvent to prepare a salt thereof, and then reacting the prepared salt with a halogenated alkyl (RX). Alkyl ether phenolphthalein derivatives can be synthesized.

Here, R may preferably be butyl, isobutyl, isopentyl, benzyl, hexyl group, ethylhexyl, octyl or decyl.

Hereinafter, the present invention will be described in more detail based on the following Examples and Experimental Examples, but the scope of the present invention is not limited thereto.

Example 1 3,3-Bis (4-butoxyphenyl) isobenzofuran-1 (3 H ) -one

NaOH (1.92 g, 0.048 mol) and phenolphthalein (phenolphthalein: 7.64 g, 0.024 mol) were added to 200 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and then the resulting product was dried for at least one day without further purification.

The dried compound was dissolved in 300 mL of DMF ( N , N- dimethylformamide), and 1-chloro-butane (1-chlorobutane: 16.16 mL, 0.192 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 250 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was removed by filtration and the filtrate obtained was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 300 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. After evaporation under reduced pressure to remove the solvent, the resulting precipitate was filtered under reduced pressure to give the product in 86% yield.

Example 2 3,3-Bis (4-isobutoxyphenyl) isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and the product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF, and 1-bromo-2-methylpropane (10.44 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off, and the obtained filtrate was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 150 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. After evaporation under reduced pressure to remove the solvent, the resulting precipitate was filtered under reduced pressure to give the product in 46% yield.

Example 3 3,3-Bis [4- (isopentyloxy) phenyl] isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and then the resulting product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF, and 1-bromo-3-methyl butane (12.00 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off and the filtrate was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 150 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. After evaporation under reduced pressure to remove the solvent, the resulting precipitate was filtered under reduced pressure to give the product in 77% yield.

Example 4 3,3-Bis [4- (hexyloxy) phenyl] isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and the product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF, and 1-bromohexane (1.bromohexane: 13.49 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off and the filtrate was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 150 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. The solvent was removed by evaporation under reduced pressure, and water was added thereto, and the resulting precipitate was filtered under reduced pressure to obtain a product in a yield of 50%.

Example 5 3,3-Bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and then the resulting product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF, and 1-bromo-2ethylhexane (1.bromo-2-ethylhexane: 17.07 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off and the filtrate was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 150 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. After evaporation under reduced pressure to remove the solvent, water was added, the water layer was extracted with ethyl acetate, the organic layer was dried over Na ₂ SO _4, and distilled under reduced pressure to obtain a syrup product in a yield of 51%.

Example 6 3,3-Bis [4- (octyloxy) phenyl] isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and then the resulting product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF, and 1-bromooctane (16.70 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off and the filtrate was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 150 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. After evaporation under reduced pressure to remove the solvent, water was added, the water layer was extracted with ethyl acetate, the organic layer was dried over Na ₂ SO _4, and distilled under reduced pressure to obtain a syrup product in a yield of 62%.

Example 7 3,3-bis [4- (decyloxy) phenyl] isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and then the resulting product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF, and 1-bromodecane (1-Bromodecane: 19.86 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with ethyl acetate. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off and the filtrate was evaporated under reduced pressure to remove ethyl acetate. The residue was taken up in 150 mL of methanol, then 100 mL of 2N NaOH was added and stirred for at least 2 hours. After evaporation under reduced pressure to remove the solvent, water was added, the water layer was extracted with ethyl acetate, the organic layer was dried over Na ₂ SO _4, and distilled under reduced pressure to obtain a syrup product in a yield of 59%.

Example 8 3,3-bis [4- (benzyloxy) phenyl] isobenzofuran-1 (3 H ) -one

NaOH (0.96 g, 0.024 mol) and phenolphthalein (3.84 g, 0.012 mol) were added to 100 mL of methanol, followed by stirring for 30 minutes or more. The reaction was distilled under reduced pressure to remove methanol, and then the resulting product was dried for at least one day without further purification.

The dried compound was dissolved in 150 mL of DMF and benzylchloride (22.09 mL, 0.096 mol) was added thereto. The reaction was heated at 60-70 ^° C. for 8 hours then cooled to room temperature. 5% NaHCO ₃ aqueous solution in the reaction 200 mL was added, diluted and extracted with methylene chloride. The organic layer was washed with brine solution and dried over Na ₂ SO ₄ . Na ₂ SO ₄ was filtered off and the filtrate was evaporated under reduced pressure to remove methylene chloride. A small amount of diethyl ether was added to the residue, followed by stirring. The resulting precipitate was filtered under reduced pressure to obtain a product in a yield of 53%.

Experimental Example 1

Alkyl ether phenolphthalein derivatives synthesized according to Examples 1 to 8 were prepared as a 100 ppm solution and measured on a UV / Vis spectrometer. For example, 0.0013 g of sample was weighed and placed in a container, and then dissolved by adding 13 mL of solvent to prepare a 100 ppm solution.

The compounds synthesized according to Examples 1-8 and their UV-spectrum results are shown in Table 1 below.

TABLE 1

Experimental Example 2

A calibration curve was drawn using the compound of Example 1 as an identifying agent using a UV / VIS spectrometer, which is shown in FIG. 1, and the absorbance at the maximum wavelength was measured and shown in FIG. 2.

In the petroleum product including the compound of Example 1, wherein R = Butyl in FIG. 1 as an identifier in FIG. 1, the absorbance at the concentration of 10 ppm, 50 ppm, and 100 ppm was 0.315, 0.657, and 1.207 (λ = 282), respectively. nm) was found to be concentration dependent.

Referring to Figure 2, it can be seen that the absorbance of 0.746 where λ _max is 282nm measured by the UV / VIS spectrometer, it can be clearly identified using the petroleum products.

Those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

1 is a graph of a calibration curve according to the concentration of the petroleum product identification identifier shown using a UV / VIS (Ultraviolet-visible spectroscopy) measuring device according to an embodiment of the present invention;

Figure 2 is a graph showing the results of measuring the absorbance of the petroleum product identification using a UV / VIS (Ultraviolet-visible spectroscopy) measuring apparatus according to an embodiment of the present invention.

Claims (10)

A method for identifying a petroleum product, comprising measuring the absorbance of a petroleum product labeled with an petroleum product identifier comprising an alkyl ether phenolphthalein derivative of Formula 1 below. [Formula 1]

Wherein R is the same as or different from each other and is hydrogen or substituted or unsubstituted C ₁ -C ₁₂ alkyl. The method of claim 1, In Chemical Formula 1, R is butyl, isobutyl, isopentyl, benzyl, hexyl group, ethylhexyl, octyl or decyl. The method of claim 1, The alkyl ether derivatives of phenolphthalein is 3,3-bis (4-isobutoxy-phenyl) - isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-isobutoxyphenyl ) isobenzofuran-1 (3 H) -one) , 3,3-bis (4-butoxy-phenyl) - isopropyl-benzofuran -1 ((3 H) - one (3,3-bis (4-butoxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis (4-iso-pentyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-isopentyloxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis (4-hexyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-hexyloxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 ( 3H ) -one (3,3-bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 (3 H ) -one), 3,3-bis (4-octyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-octyloxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis (4-dodecyl oxyphenyl) isopropyl benzofuran -1 (3 H) - one (3,3-bis (4-decyloxyphenyl ) isobenzofuran-1 (3 H) -one) and 3,3-bis (4-benzyloxyphenyl) isopropyl benzofuran -1 (3 H) - one (3,3-bis (4-benzyloxyphenyl ) isobenzofuran-1 (3 H) -one) one selected from the group consisting of Or two or more petroleum products. The method of claim 1, The labeled petroleum product identification method of petroleum products, characterized in that the maximum absorption wavelength from 240 to 282 nm measured by UV / VIS (Ultraviolet-visible spectroscopy) measuring device. The method of claim 1, The labeled petroleum product identification method of petroleum products, characterized in that the absorbance of 0.43 to 0.75 as measured by a UV / VIS (Ultraviolet-visible spectroscopy) measuring device. An identifier for a petroleum product used in the method for identifying a petroleum product according to any one of claims 1 to 5, including an alkyl ether phenolphthalein derivative of the general formula (1).  [Formula 1]

Wherein R is the same as or different from each other and is hydrogen or substituted or unsubstituted C ₁ -C ₁₂ alkyl. The method of claim 6, In Formula 1, R is butyl, isobutyl, isopentyl, benzyl, hexyl, ethylhexyl, octyl or decyl. The method of claim 6, The alkyl ether derivatives of phenolphthalein is 3,3-bis (4-isobutoxy-phenyl) - isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-isobutoxyphenyl ) isobenzofuran-1 (3 H) -one) , 3,3-bis (4-butoxy-phenyl) - isopropyl-benzofuran -1 ((3 H) - one (3,3-bis (4-butoxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis (4-iso-pentyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-isopentyloxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis (4-hexyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-hexyloxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 ( 3H ) -one (3,3-bis [4- (2-ethylhexyloxy) phenyl] isobenzofuran-1 (3 H ) -one), 3,3-bis (4-octyloxy-phenyl) isopropyl-benzofuran -1 (3 H) - one (3,3-bis (4-octyloxyphenyl ) isobenzofuran-1 (3 H) -one), 3,3-bis (4-dodecyl oxyphenyl) isopropyl benzofuran -1 (3 H) - one (3,3-bis (4-decyloxyphenyl ) isobenzofuran-1 (3 H) -one) and 3,3-bis (4-benzyloxyphenyl) isopropyl benzofuran -1 (3 H) - one (3,3-bis (4-benzyloxyphenyl ) isobenzofuran-1 (3 H) -one) one selected from the group consisting of Or two or more petroleum products' identification agent. A phenolphthalein salt is prepared, and a method for preparing an identifier for a petroleum product according to claim 6, comprising the step of reacting an alkyl halide represented by the following formula (2). [Formula 2] (R-X) Wherein R is substituted or unsubstituted C ₁ -C ₁₂ alkyl and X is Cl, Br or I. The method of claim 9, In Chemical Formula 2, R is butyl, isobutyl, isopentyl, benzyl, hexyl group, ethylhexyl, octyl or decyl.

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