Antifouling agent for heat exchangers for preheating raw oil in petroleum refining processes, raw oil for petroleum refining processes, and method for preventing fouling of heat exchangers for preheating raw oil in petroleum refining processes

Abstract

To provide: an agent for preventing staining of a heat exchanger for pre-heating raw oil in a petroleum purification process, which can sufficiently prevent the deposition of stains on a heat exchanger for pre-heating raw oil, in order to exhibit excellent solubility on the stains deposited on the heat exchanger; raw oil for a petroleum purification process; and a method for preventing staining of a heat exchanger for pre-heating raw oil in a petroleum purification process.SOLUTION: An agent for preventing staining of a heat exchanger for pre-heating raw oil in a petroleum purification process comprises a terpene compound with a boiling point of 200°C or higher; raw oil for a petroleum purification process containing the staining preventing agent of 100 mass ppm-5000 mass ppm; and a method for preventing staining of a heat exchanger for pre-heating raw oil in a petroleum purification process, the method including the step of supplying a heat exchanger for pre-heating raw oil with the raw oil containing the staining preventing agent of 100 mass ppm-5000 mass ppm.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an antifouling agent for a heat exchanger for preheating feed oil in a petroleum refining process, a feed oil for the petroleum refining process, and a method for preventing fouling of a heat exchanger for preheating feed oil in a petroleum refining process.

[0002] In the petroleum refining process, crude oil and various heavy oils are used as feedstock oils and are subjected to refining treatment at high temperatures in various refining units such as atmospheric distillation units, vacuum distillation units, fluid catalytic cracking units (FCC), direct desulfurization units, and indirect desulfurization units.In order to improve the processing efficiency of each unit, the feedstock oil to be treated is preheated in a heat exchanger before being sent to each unit (see, for example, Patent Document 1).

[0003] For example, among the refining apparatuses mentioned above, a fluid catalytic cracker (FCC) is an apparatus that brings heavy oil into contact with a fluid catalytic cracking catalyst at a high temperature of 500°C or higher, and cracks the heavy oil to produce gasoline fractions and middle distillates. The heavy oils that are processed in the fluid catalytic cracker include desulfurized heavy oil, thermally desulfurized heavy oil, indirectly desulfurized heavy oil, and directly desulfurized heavy oil. These heavy oils are preheated to around 300°C in a heat exchanger (or in some cases, a heat exchanger and a heating furnace) before being fed into the fluid catalytic cracker. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2015 / 022979 publication DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] However, the inventors have found through their research that, as mentioned above, the feedstock oils (crude oil and various heavy oils) to be treated contain very heavy components, and therefore preheating them using a heat exchanger tends to result in deposits (dirt) adhering to the heat exchange parts, reducing the heat exchange efficiency. If the heat exchange efficiency decreases, the crude oil or heavy oil fed into the various refining equipment will not be sufficiently heated, and more energy will be required for treatment in the refining equipment. This means that the crude oil or heavy oil must be preheated in a separate heating furnace, or if a heating furnace is not available, the processing volume of the refining equipment must be reduced, resulting in increased production costs and reduced productivity.

[0006] Under these circumstances, the present invention aims to provide an antifouling agent for a heat exchanger used to preheat raw oil in a petroleum refining process, which can sufficiently suppress the adhesion of contaminants to the preheating heat exchanger, a raw oil for the petroleum refining process, and a method for preventing fouling of a heat exchanger used to preheat raw oil in a petroleum refining process. [Means for solving the problem]

[0007] In order to solve the above technical problems, the inventors conducted extensive research and came up with the idea of using an anti-fouling agent that is soluble in the components that cause the dirt that adheres to the preheating heat exchanger, thereby suppressing the adhesion of dirt to the walls of the heat exchanger.

[0008] Based on the above findings, the present inventors conducted further studies and found that the above object can be achieved by using a terpene compound having a boiling point of 200°C or higher as an antifouling agent for a heat exchanger for preheating raw oil in a petroleum refining process, and have completed the present invention based on this finding.

[0009] That is, the present invention is (1) An antifouling agent for a heat exchanger for preheating raw oil in a petroleum refining process, which comprises a terpene compound having a boiling point of 200°C or higher; (2) The terpene compound is represented by the following general formula (I): [ka] (However, R 1 and R 2 is a hydrocarbon group having 1 to 8 carbon atoms or a hydroxy group, and R 1 and R 2 At least one of R is a hydrocarbon group having 1 to 8 carbon atoms. 1 and R 2 The total number of carbon atoms in or a compound represented by the following general formula (II): [ka] (However, R 3 and R 4 is a hydrocarbon group having 1 to 9 carbon atoms, and R 3 and R 4 The total number of carbon atoms in The antifouling agent for a heat exchanger for preheating raw oil in a petroleum refining process according to (1) above, which is a compound represented by the formula: (3) A feedstock for a petroleum refining process, characterized in that the feedstock contains 100 ppm by mass to 5000 ppm by mass of the antifouling agent according to (1) or (2) above; and (4) A method for preventing fouling of a heat exchanger for preheating raw oil in an oil refining process, comprising: A feedstock oil containing 100 mass ppm to 5000 mass ppm of the antifouling agent according to (1) or (2) above is supplied to a heat exchanger for preheating the feedstock oil. A method for preventing fouling of a heat exchanger for preheating raw oil in an oil refining process, This provides: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an antifouling agent for a feedstock oil preheating heat exchanger in a petroleum refining process, a feedstock oil for a petroleum refining process, and a method for preventing fouling of a feedstock oil preheating heat exchanger in a petroleum refining process, which exhibits excellent solubility for contaminants adhering to the feedstock oil preheating heat exchanger and can therefore sufficiently suppress the adhesion of contaminants to the feedstock oil preheating heat exchanger. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a conceptual diagram illustrating a method for measuring the temperature difference over time of the feed oil temperature at the heater outlet. DETAILED DESCRIPTION OF THE INVENTION

[0012] The antifouling agent for a heat exchanger for preheating feed oil in an oil refining process according to the present invention is characterized in that it comprises a terpene compound having a boiling point of 200°C or higher.

[0013] Examples of feedstock preheating heat exchangers in petroleum refining processes to which the antifouling agent of the present invention can be applied include feedstock preheating heat exchangers for atmospheric distillation units, feedstock heat exchangers for vacuum distillation units, feedstock preheating heat exchangers for fluid catalytic cracking units (FCC), feedstock preheating heat exchangers for direct desulfurization units, and feedstock preheating heat exchangers for indirect desulfurization units, and a feedstock preheating heat exchanger for a fluid catalytic cracking unit (FCC) is suitable.

[0014] The feedstock oil (crude oil and various heavy oils) supplied to each oil refining process is appropriately selected from conventionally known feedstocks.

[0015] The stain preventive agent according to the present invention comprises a terpene compound having a boiling point of 200°C or higher. The stain preventive agent according to the present invention is preferably composed of a terpene compound having a boiling point of 210°C or higher, more preferably composed of a terpene compound having a boiling point of 220°C or higher. Since the antifouling agent has a boiling point of 200°C or higher, it is difficult to volatilize during refining, even when added to feedstock oil for petroleum refining processes, and is therefore easy to handle. In the present application, the boiling point refers to the value under atmospheric pressure (one atmosphere).

[0016] The anti-fouling agent of the present invention is preferably composed of a terpene compound having a melting point of 80°C or less, more preferably composed of a terpene compound having a melting point of 70°C or less, and even more preferably composed of a terpene compound having a melting point of 60°C or less. Since the antifouling agent has a melting point of 80°C or less, it dissolves easily even when added to raw oil for petroleum refining processes, and can be easily supplied and distributed during petroleum refining processes.

[0017] The purity of the antifouling agent according to the present invention is preferably 90% or more, more preferably 95% or more, and even more preferably 97% or more. The purity of the antifouling agent is 90% or more, so that it can effectively exert its antifouling effect when added to feedstock oil for petroleum refining processes.

[0018] In this application, the term "terpene compound" means a terpene or a terpene derivative.

[0019] Terpenes generally have the molecular formula (C5H8) n (n is an integer of 1 or more) refers to a series of compounds containing a carbon skeleton derived from isoprene (C5H8), including hemiterpenes (C5H8), monoterpenes (C 10 H 16 ), sesquiterpenes (C 15 H 24 ), diterpenes (C 20 H 32 ) etc. In addition, in this application, terpene derivatives refer to a group of compounds derived from terpenes, and examples of terpene derivatives include various alcohols, aldehydes, ketones, esters, and natural essential oils containing these, and also include decomposition products of any of these.

[0020] The terpene compounds constituting the stain-preventing agent of the present invention may be cyclic (monocyclic or polycyclic) compounds or acyclic compounds, and may be aromatic compounds or non-aromatic compounds, as long as they have a boiling point of 200°C or higher.

[0021] The terpene compounds constituting the stain-preventing agent of the present invention are preferably one or more selected from monoterpenes, sesquiterpenes and derivatives thereof, and more preferably one or more selected from cyclic monoterpenes, cyclic monoterpene derivatives, acyclic monoterpenes, acyclic monoterpene derivatives, cyclic sesquiterpenes, cyclic sesquiterpene derivatives, acyclic sesquiterpenes and acyclic sesquiterpene derivatives.

[0022] The terpene compounds constituting the stain preventive agent according to the present invention preferably have a total of 9 to 20 carbon atoms, more preferably 9 to 17 carbon atoms, and even more preferably 9 to 15 carbon atoms.

[0023] Specific examples of the terpene compounds constituting the stain preventive agent according to the present invention include the following compounds. That is, the cyclic monoterpene may be one or more selected from limonene and the like. Examples of the cyclic monoterpene derivatives include one or more compounds selected from compounds represented by the general formula (I) described below, such as thymol, menthol, carveol, (1S,2S)-fragranol, 4,α,α-trimethylbenzenemethanol, 8-p-cimenol, pulegone, rose oxide, menthyl acetate, terpineol, carvone, and hinokitiol, and compounds represented by the general formula (II) described below, such as carvacrol and thymol. Examples of the acyclic monoterpene derivative include one or more selected from 2,4-diethyl-1,5-pentanediol, geraniol, and the like. The cyclic sesquiterpenes include one or more selected from guaiazulene and the like. Examples of cyclic sesquiterpene derivatives include one or more selected from 2-[1-methyl-1-(4-methyl-3-cyclohexen-1-yl)ethoxy]ethanol, guaiol, brunesol, α-ionone, β-ionone, α-iso-methylionone, α-longipinene, and the like. The acyclic sesquiterpenes include one or more selected from farnesene and the like. The acyclic sesquiterpene derivatives include one or more selected from nerolidol, farnesol, and the like.

[0024] Furthermore, examples of the terpene derivative include cyclic monoterpene derivatives, such as one or more compounds selected from the compounds represented by the following general formula (I) or (II).

[0025] That is, the terpene derivatives include those represented by the following general formula (I): [ka] (However, R 1 and R 2 is a hydrocarbon group having 1 to 8 carbon atoms or a hydroxy group, and R 1 and R 2 At least one of R is a hydrocarbon group having 1 to 8 carbon atoms. 1 and R 2 The total number of carbon atoms in Examples of the compound include compounds represented by the following formula:

[0026] In the compound represented by general formula (I), R 1 or R 2 has 2 to 8 carbon atoms, preferably 2 to 7 carbon atoms, and more preferably 2 to 6 carbon atoms. R 1 or R 2 is a hydrocarbon group, R 1 or R 2 may be a straight-chain hydrocarbon group or a branched-chain hydrocarbon group. In the compound represented by general formula (I), R 1 and R 2 The total number of carbon atoms is 2 or more, preferably 2 to 10, more preferably 2 to 7, and even more preferably 2 to 5.

[0027] R 1 or R 2 Specific examples of the alkyl group include a hydrogen atom, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group or an isobutyl group, a pentyl group or an isopentyl group, and the like.

[0028] R 1 and R 2 may be the same or different.

[0029] Specific examples of the compound represented by general formula (I) include hinokitiol (2-hydroxy-6-isopropylcyclohepta-2,4,6-trien-1-one).

[0030] The terpene derivatives include those represented by the following general formula (II): [ka] (However, R 3 and R 4 is a hydrocarbon group having 1 to 9 carbon atoms, and R 3 and R 4 The total number of carbon atoms in Examples of the compound include compounds represented by the following formula:

[0031] In the compound represented by general formula (II), R 3 or R 4has 1 to 9 carbon atoms, preferably 1 to 8 carbon atoms, and more preferably 1 to 7 carbon atoms. R 3 or R 4 may be a straight-chain hydrocarbon group or a branched-chain hydrocarbon group.

[0032] In the compound represented by general formula (II), R 3 and R 4 The total number of carbon atoms is 3 or more, preferably 3 to 9, and more preferably 3 to 4.

[0033] R 3 or R 4 Specific examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group or an isobutyl group, a pentyl group or an isopentyl group, and the like.

[0034] R 3 and R 4 may be the same or different.

[0035] Specific examples of the compound represented by general formula (II) include carvacrol (5-isopropyl-2-methylphenol) and thymol (2-isopropyl-5-methylphenol).

[0036] The antifouling agent according to the present invention is preferably a compound represented by general formula (I), a compound represented by general formula (II), or 2,4-diethyl-1,5-pentanediol, and more preferably a compound represented by general formula (I) or a compound represented by general formula (II).

[0037] One example of a mode of use of the anti-fouling agent of the present invention is to supply raw oil blended with the anti-fouling agent of the present invention to a preheating heat exchanger to which the agent is applied and circulate it.This mode makes it possible to suppress the adhesion of dirt to the walls of the heat exchanger. According to the above-mentioned usage mode of the antifouling agent of the present invention, the antifouling effect of the heat exchanger can be exerted while the preheating heat exchanger is continuously operating. Therefore, it is preferable that the antifouling agent of the present invention is blended with raw oil and supplied to and circulated in the preheating heat exchanger to which it is applied.

[0038] Thus, the antifouling agent according to the present invention is used for the purpose of suppressing (preventing) the adhesion of dirt to the inner wall surface of a heat exchanger for preheating feed oil in a petroleum refining process.

[0039] When raw oil containing the antifouling agent of the present invention is supplied to a preheating heat exchanger to which the agent is applied, the concentration of the antifouling agent of the present invention in the raw oil is preferably 100 mass ppm to 5000 mass ppm, more preferably 300 mass ppm to 4500 mass ppm, and even more preferably 500 mass ppm to 4000 mass ppm. By ensuring that the concentration of the antifouling agent in the feed oil is within the above range, it is possible to inhibit the deposition of fouling from the feed oil on the wall surface of the preheating heat exchanger.

[0040] According to the present invention, it is possible to provide an anti-fouling agent for a heat exchanger for preheating raw oil in an oil refining process, which exhibits excellent solubility for contaminants adhering to the heat exchanger for preheating raw oil, and can therefore sufficiently suppress the adhesion of contaminants to the heat exchanger for preheating raw oil.

[0041] Next, the feedstock oil for the petroleum refining process according to the present invention will be described. The feedstock oil for a petroleum refining process according to the present invention is characterized in that it comprises a feedstock oil containing 100 ppm by mass to 5000 ppm by mass of the antifouling agent according to the present invention. Details of the antifouling agent according to the present invention and the raw oil containing the antifouling agent are as described above.

[0042] In the feedstock oil for petroleum refining processes according to the present invention, the blending ratio (concentration) of the antifouling agent according to the present invention is 100 mass ppm to 5000 mass ppm, preferably 300 mass ppm to 4500 mass ppm, and more preferably 500 mass ppm to 4000 mass ppm. By blending the antifouling agent in the feed oil according to the present invention in the above range, adhesion of dirt from the feed oil to the wall surface of the preheating heat exchanger can be suppressed.

[0043] The feedstock oil for the petroleum refining process according to the present invention preferably has a temperature difference ΔT of the feedstock oil temperature at the heater outlet over time, calculated by the following method, of 0°C to 40°C, more preferably 0°C to 35°C, and even more preferably 0°C to 30°C.

[0044] <Method for measuring the temperature difference over time of the feed oil temperature at the heater outlet> As shown in the schematic cross-sectional view of Figure 1, 1.1 L of feed oil stored in a feed oil tank T and heated to 70°C by a hot plate HP is fed at 10 mL / min into a distribution pipe c (diameter 6.5 mm) whose entire flow path is maintained at 70°C by a ribbon heater (not shown), while being sequentially heated to set temperatures T1 (170°C) and T2 (300°C) by heaters HT1 and HT2, each equipped with a heater rod R (made of stainless steel, length 200 mm, diameter 6 mm) in the feed oil distribution pipe, and returned to the feed oil tank T. This operation is continued for 600 minutes, and then the heater outlet temperature T3 of the feed oil is measured by a feed oil temperature measuring means Tm2out arranged at the feed oil outlet of the heater HT2. The temperature difference calculated by "(heater outlet temperature T3 at the beginning of heating) - (heater outlet temperature T3 after 600 minutes of heating)" is measured twice in the heater HT2, and the arithmetic mean value of these temperature differences is defined as the temperature difference ΔT.

[0045] Since the temperature difference ΔT is controlled within the above range, i.e., the heater outlet temperature T3 is maintained within a predetermined range, it can be determined that the amount of dirt adhering to the heater rod R inside the heating heater HT is small, and that the adhesion of dirt to the feed oil preheating heat exchanger is sufficiently suppressed. If the temperature difference ΔT is outside the above range, the heater outlet temperature T3 cannot be maintained, and therefore the amount of dirt adhering to the heater rod R inside the heating heater HT increases, and it can be determined that the adhesion of dirt to the feed oil preheating heat exchanger cannot be sufficiently suppressed.

[0046] According to the present invention, it is possible to provide a feedstock oil for an oil refining process that exhibits excellent solubility for contaminants adhering to a feedstock oil preheating heat exchanger, and can therefore sufficiently suppress the adhesion of contaminants to the feedstock oil preheating heat exchanger.

[0047] Next, a method for preventing fouling of a feed oil preheating heat exchanger in an oil refining process according to the present invention will be described. The method for preventing fouling of a heat exchanger for preheating raw oil in an oil refining process according to the present invention is characterized by supplying raw oil containing 100 mass ppm to 5000 mass ppm of the antifouling agent according to the present invention to the heat exchanger for preheating raw oil. Details of the antifouling agent according to the present invention and the raw oil containing the antifouling agent are as described above. The details of the feedstock oil preheating heat exchangers for supplying each feedstock oil are also as described above.

[0048] In the method for preventing fouling of a heat exchanger for preheating feed oil in an oil refining process according to the present invention, the blending ratio (concentration) of the antifouling agent according to the present invention in the feed oil is 100 mass ppm to 5000 mass ppm, preferably 300 mass ppm to 4500 mass ppm, and more preferably 500 mass ppm to 4000 mass ppm. In the method for preventing fouling of a feedstock oil preheating heat exchanger in an oil refining process according to the present invention, by setting the blending ratio of the fouling inhibitor in the feedstock oil within the above range, it is possible to suppress the adhesion of fouling from the feedstock oil to the wall surface of the preheating heat exchanger.

[0049] According to the present invention, raw oil containing the antifouling agent of the present invention is supplied to the preheating heat exchanger, so that the antifouling effect of the heat exchanger can be easily achieved while the preheating heat exchanger is continuously operating. Therefore, according to the present invention, a method for preventing fouling of a feedstock oil preheating heat exchanger in an oil refining process can be provided, which exhibits excellent solubility for contaminants adhering to the feedstock oil preheating heat exchanger, and can easily and sufficiently suppress the adhesion of contaminants to the feedstock oil preheating heat exchanger. [Example]

[0050] The present invention will be described in more detail below based on examples and comparative examples, but the present invention is not limited to these examples in any way.

[0051] (Examples 1 to 4, Comparative Examples 1 and 2) (1) Raw material base material As base material A and base material B constituting the feed oil composition for a fluid catalytic cracking unit, desulfurized vacuum gas oil (T-VGO) and directly desulfurized heavy oil (DDS-P), respectively, having the physical properties shown in Table 1, were prepared. The physical properties listed in Table 1 are values measured by the methods shown below.

[0052] (Distillation properties) Measurement was carried out in accordance with the provisions of JIS K2254:1998.

[0053] (Density at 15°C (Density (15°C))) Measurements were performed based on the specifications of JIS K2249-1:2011.

[0054] (flash point) Measurements were made based on "Determination of flash point - Part 3: Pensky-Martens closed-cell method" as specified in JIS K 2265-3:2007.

[0055] (Sulfur content) Sulfur content of 500 ppm by mass or less was measured based on "Crude oil and petroleum products - Determination of sulfur content - Part 6: Ultraviolet fluorescence method" specified in JIS K 2541-6:2003, and sulfur content of more than 500 ppm by mass was measured based on "Crude oil and petroleum products - Determination of sulfur content - Part 4: Radiation excitation method" specified in JIS K 2541-4:2003.

[0056] (Aromatic content percentage) Measurements were performed in accordance with the regulations of JPI-5S-49-97.

[0057] (carbon residue) Measurements were made based on "Crude oil and petroleum products - Determination of carbon residue - Part 2: Micro method" as specified in JIS K 2270-2:2009.

[0058] (ash) Measurements were made based on the "Crude oil and petroleum products - Testing method for ash content and sulfated ash content" specified in JIS K 2272:1998.

[0059] (Nitrogen content percentage) Measurements were performed based on the "Crude oil and petroleum products - Nitrogen analysis test method" (chemiluminescence method) specified in JIS K 2609 (1998).

[0060] (Kinematic viscosity at 50°C (Kinematic viscosity (50°C)) Measurements were made based on JIS K 2283:2000 "Crude oil and petroleum products - Kinematic viscosity test method and viscosity index calculation method."

[0061] (pour point) Measurements were made based on the "Testing method for pour point and cloud point of crude oil and petroleum products" specified in JIS K 2269:1987.

[0062] (Asphaltene content) Measurements were performed in accordance with the regulations of JPI-5S-22-83.

[0063] [Table 1]

[0064] (2) Selection of anti-fouling agent As the stain-preventing agents used in each of the Examples and Comparative Examples, stain-preventing agents exhibiting the physical properties shown in Table 2 were selected. In Comparative Example 1, no antifouling agent was used.

[0065] [Table 2]

[0066] (3) Preparation of raw oil The base material A and base material B were mixed in a volume ratio of base material A:base material B = 7:3 to prepare a base material mixture. Antifouling agents each having the physical properties shown in Table 2 were added to the base material mixture in the blending ratios shown in Table 3 to prepare a feedstock for a fluid catalytic cracking unit. Next, in the heating device shown in the schematic cross section of FIG. 3, any of the feedstock oils prepared as described above was stored in a feedstock oil tank T. 1.1 L of feed oil stored in a feed oil tank T and heated to 70°C by a hot plate HP was fed at 10 mL / min into a distribution pipe c (diameter 6.5 mm), the entire flow path of which was maintained at 70°C by a ribbon heater (not shown). The feed oil was heated sequentially to set temperatures T1 (170°C) and T2 (300°C) by heaters HT1 and HT2, each equipped with a heater rod R (made of stainless steel, length 200 mm, diameter 6 mm) in the feed oil distribution pipe, and the feed oil was returned to the feed oil tank T. This operation was continued for 600 minutes, after which the heater outlet temperature T3 of the feed oil was measured by a feed oil temperature measuring means Tm2out installed at the feed oil outlet of the heater HT2. The temperature difference calculated by "(heater outlet temperature T3 at the beginning of heating) - (heater outlet temperature T3 after 600 minutes of heating)" was measured twice in the heater HT2, and the arithmetic mean value of the measurements was determined as the temperature difference ΔT. The results are shown in Table 3.

[0067] [Table 3]

[0068] As can be seen from Tables 2 and 3, in Examples 1 to 4, a terpene compound having a boiling point of 200°C or higher is used as the anti-fouling agent, and therefore when the raw oil containing such an anti-fouling agent is heated, the temperature difference ΔT {(heater outlet temperature T3 at the beginning of heating) - (heater outlet temperature T3 after 600 minutes of heating)} at the heater outlet temperature in the heating heater HT2 can be controlled to 10.4 to 37.5°C, thereby sufficiently suppressing the adhesion of dirt.

[0069] On the other hand, from Tables 2 and 3, it can be seen that in Comparative Examples 1 and 2, since the above-mentioned specified anti-fouling agents were not used, when the obtained raw oil was heated, the temperature difference ΔT {(heater outlet temperature T3 at the beginning of heating) - (heater outlet temperature T3 after 600 minutes of heating)} of the heater outlet temperature T3 in the heating heater HT2 was high at 42.7 to 49.5°C, and the adhesion of dirt could not be sufficiently suppressed. [Industrial Applicability]

[0070] According to the present invention, it is possible to provide an antifouling agent for a feedstock oil preheating heat exchanger in a petroleum refining process, a feedstock oil for a petroleum refining process, and a method for preventing fouling of a feedstock oil preheating heat exchanger in a petroleum refining process, which exhibits excellent solubility for contaminants adhering to the feedstock oil preheating heat exchanger and can therefore sufficiently suppress the adhesion of contaminants to the feedstock oil preheating heat exchanger.

Claims

1. An antifouling agent for a heat exchanger used to preheat raw oil in a petroleum refining process, comprising a terpene compound having a boiling point of 200°C or higher.

2. The terpene compound is represented by the following general formula (I): 【Chemical 1】 (However, R １ and R ２ is a hydrocarbon group having 1 to 8 carbon atoms or a hydroxy group, and R １ and R ２ At least one of R is a hydrocarbon group having 1 to 8 carbon atoms. １ and R ２ The total number of carbon atoms in or a compound represented by the following general formula (II): 【Chemistry 2】 (However, R ３ and R ４ is a hydrocarbon group having 1 to 9 carbon atoms, and R ３ and R ４ The total number of carbon atoms in 2. The antifouling agent for a heat exchanger for preheating feed oil in a petroleum refining process according to claim 1, wherein the compound is represented by the formula:

3. A feedstock oil for a petroleum refining process, comprising a feedstock oil containing 100 ppm by mass to 5000 ppm by mass of the antifouling agent according to claim 1 or 2.

4. 1. A method for preventing fouling of a feedstock oil preheating heat exchanger in an oil refining process, comprising: A raw oil containing 100 mass ppm to 5000 mass ppm of the antifouling agent according to claim 1 or 2 is supplied to a heat exchanger for preheating raw oil. A method for preventing fouling of a heat exchanger for preheating raw oil in an oil refining process, comprising:

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