Mixed oil, method for manufacturing mixed oil

Abstract

This invention provides a novel technology that can reduce the viscosity of paraffinic liquid hydrocarbon oils. [Solution] A mixed oil comprising a paraffinic liquid hydrocarbon oil derived from non-petroleum refining and a pyrolysis oil, wherein the pyrolysis oil is obtained by pyrolyzing a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas, cooling the pyrolysis gas to obtain a pyrolysis crude oil, and separating the pyrolysis crude oil without any treatment to reduce the content of aromatic compounds, wherein the density of the mixed oil at 15°C is 0.7870 g / cm³ 3 More than 0.8200g / cm 3 The following is a mixed oil.

Description

[Technical Field]

[0001] This invention relates to a mixed oil containing paraffinic liquid hydrocarbon oil. [Background technology]

[0002] In recent years, efforts have been made to develop alternative fuels that do not rely on fossil fuels, in order to realize a decarbonized society. For example, paraffinic liquid hydrocarbon oils derived from non-petroleum refining, such as hydrotreated vegetable oil (HVO), have attracted attention as such alternative fuels (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2024-143144 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] One of the objectives of this invention is to provide a novel technology that can reduce the viscosity of paraffinic liquid hydrocarbon oils. [Means for solving the problem]

[0005] When considering its use as fuel during periods of relatively low temperatures, such as winter, a lower viscosity for liquid hydrocarbon oil is preferable.

[0006] As a result of diligent research, the inventors have discovered that by mixing paraffinic liquid hydrocarbon oil with a pyrolysis oil obtained by pyrolysis of a mixture containing polyethylene and / or polypropylene and polystyrene, a mixed oil with a lower viscosity than that of paraffinic liquid hydrocarbon oil alone can be obtained. The mixed oil of the present invention contains pyrolysis oil made from polyethylene and / or polypropylene and polystyrene, and contains aromatic compound components in the pyrolysis oil without removal. This changes the intermolecular interactions between the linear paraffin component and the pyrolysis oil-derived component in the mixed oil, increasing molecular fluidity and thus achieving a decrease in kinematic viscosity.

[0007] The gist of this invention is as follows: [1] A mixed oil containing a paraffinic liquid hydrocarbon oil and a pyrolysis oil derived from non-petroleum refining, The pyrolysis oil is obtained by pyrolysis of a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas, cooling the pyrolysis gas to obtain pyrolysis crude oil, and separating the crude oil without any treatment to reduce the content of aromatic compounds. The density of the aforementioned mixed oil at 15°C is 0.7870 g / cm³. 3 More than 0.8200g / cm 3 The following is a mixed oil. [2] The mixed oil according to [1], wherein the mixture that serves as the raw material for the pyrolysis oil contains 80% by weight or more and 97% by weight or less of polyethylene and / or polypropylene, and 3% by weight or more and 20% by weight or less of polystyrene. [3] The mixed oil according to [2], wherein the mixing ratio of the pyrolysis oil is 3% by weight or more and 20% by weight or less of the total of the paraffinic liquid hydrocarbon oil and the pyrolysis oil. [4] The mixed oil according to [3], wherein the mixing ratio of the pyrolysis oil is 5% by weight or more and 10% by weight or less of the total of the paraffinic liquid hydrocarbon oil and the pyrolysis oil. [5] The mixed oil according to any one of [1] to [4], further comprising light oil. [6] The mixed oil according to any one of [1] to [5], wherein the mixed oil is used as a fuel. [7] A method for producing a mixed oil, comprising: mixing a paraffinic liquid hydrocarbon oil derived from non-petroleum refining and a pyrolysis oil, as the pyrolysis oil, a pyrolysis oil obtained by: thermally decomposing a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas; cooling the pyrolysis gas to obtain crude pyrolysis oil; and separating the crude pyrolysis oil without performing a treatment for reducing the content of aromatic compounds, is used, the density of the obtained mixed oil at 15°C is 0.7870 g / cm 3 or more and 0.8200 g / cm 3 or less, wherein the paraffinic liquid hydrocarbon oil and the pyrolysis oil are mixed. [8] comprising mixing a pyrolysis oil with a paraffinic liquid hydrocarbon oil derived from non-petroleum refining, the pyrolysis oil is a pyrolysis oil obtained by: thermally decomposing a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas; cooling the pyrolysis gas to obtain crude pyrolysis oil; and separating the crude pyrolysis oil without performing a treatment for reducing the content of aromatic compounds, A method for adjusting the density of the obtained mixed oil at 15°C. [9] the density of the obtained mixed oil at 15°C is adjusted to 0.7870 g / cm 3 or more and 0.8200 g / cm 3 or less, the adjustment method according to [8].[= Effects of the Invention

[0008] According to the present invention, a novel technique capable of reducing the viscosity of a paraffinic liquid hydrocarbon oil can be provided. Brief Description of the Drawings

[0009] [Figure 1] FIG. 1 is a diagram outlining a system configuration for producing pyrolytic oil according to the present embodiment. [Figure 2] FIG. 2 is a diagram showing an example of a flow for producing pyrolytic oil according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, one embodiment of the present invention will be described in detail. It should be noted that the present invention is not limited to the following embodiments, and can be implemented with various modifications within the scope of the gist of the present invention.

[0011] The mixed oil of the present embodiment comprises a paraffinic liquid hydrocarbon oil and a pyrolytic oil obtained from a mixture containing polyethylene and / or polypropylene and polystyrene (hereinafter also simply referred to as pyrolytic oil). In addition to these two components, the mixed oil of the present embodiment may contain other components within a range that can achieve the object of the present invention; for example, the mixed oil may further comprise light gas oil.

[0012] The pyrolytic oil according to the present embodiment is a pyrolytic oil obtained by pyrolyzing a mixture containing polyethylene and / or polypropylene and polystyrene. Since the specific gravity of the pyrolytic oil itself can be controlled, the specific gravity of the mixed oil obtained using the same can also be controlled. Specifically, in consideration of reducing kinematic viscosity at 40°C and enabling use as a fuel for, for example, diesel engines, the density of the mixed oil of the present embodiment at 15°C is 0.7870 g / cm 3 or more and 0.8200 g / cm 3 or less, adjusted to fall within the above range.

[0013] The density at 15°C can be measured in accordance with JIS K 2249-1 "Testing methods for density of crude oil and petroleum products and conversion table among density, mass and capacity". Kinematic viscosity at 40°C can be measured in accordance with JIS K 2283 "Testing method for kinematic viscosity of petroleum products".

[0014] In the present specification, paraffinic liquid hydrocarbon oil refers to a hydrocarbon oil that is liquid at normal temperature and normal pressure (25°C, 1 atm) with a straight-chain paraffin component as the main component (e.g., 70% by weight or more). The straight-chain paraffin component has the molecular formula C n H 2n+2 n (where n is an integer of 1 or more, particularly n approximately from 10 to 20), which is an unbranched saturated linear compound, and examples thereof include decane, undecane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, nonadecane, and icosane.

[0015] The paraffinic liquid hydrocarbon oil according to the present embodiment may, for example, be a non-petroleum-refining-derived liquid hydrocarbon oil produced without going through a petroleum refining process. Specific examples of the paraffinic liquid hydrocarbon oil according to the present embodiment include Hydrotreated Vegetable Oil (HVO), GTL (Gas to Liquids) fuel, FT (Fischer-Tropsch) diesel fuel, and paraffinic liquid hydrocarbon oil produced by thermal decomposition from plastics containing polyethylene (PE) as a main component. These may be used alone, or two or more thereof may be used in combination. Examples of the liquid hydrocarbon oil produced by thermal decomposition from plastics containing polyethylene as a main component include those produced from plastics substantially consisting of only polyethylene as a raw material (hereinafter, the liquid hydrocarbon oil is also simply referred to as 100% polyethylene-derived liquid hydrocarbon oil). Liquid hydrocarbon oil derived from 100% polyethylene can be obtained, for example, by thermally decomposing polyethylene to generate gas, cooling the resulting gas to obtain crude oil, and separating the crude oil. Specifically, polyethylene can be thermally decomposed at 460°C to 520°C, generating gas at a temperature of 200°C to 300°C, cooling the gas to obtain crude oil, and then subjecting the resulting crude oil to distillation to obtain liquid hydrocarbon oil derived from 100% polyethylene at a temperature range of 180°C to 270°C.

[0016] For example, in the case of liquid hydrocarbon oil derived from 100% polyethylene, the density at 15°C is 0.786 g / cm³. 3 Approximately, the kinematic viscosity at 40°C is 1,600 mm². 2 It is approximately / s. Furthermore, in the case of HVO, the density at 15°C is 0.770~0.790 g / cm³. 3 Approximately, the kinematic viscosity at 40°C is 2,000 to 4,000 mm². 2 It's around / s.

[0017] In this specification, pyrolysis oil refers to a product mainly composed of hydrocarbons (for example, 90% by weight or more) obtained by pyrolysis of plastics, and which is liquid at room temperature and pressure (25°C, 1 atm).

[0018] Figure 1 is a diagram showing an overview of the system configuration for the production of pyrolysis oil according to this embodiment, and Figure 2 is a diagram showing an example of the processing flow for the production of pyrolysis oil according to this embodiment.

[0019] The pyrolysis oil according to this embodiment can be obtained by pyrolyzing a mixture containing polyethylene (PE) and / or polypropylene (PP) and polystyrene (PS) to generate pyrolysis gas, cooling the pyrolysis gas to obtain pyrolysis crude oil, and separating the aromatic compounds from the pyrolysis crude oil without any treatment to reduce the content of aromatic compounds. Specifically, a mixture containing polyethylene and / or polypropylene and polystyrene is pyrolyzed, for example, using a pyrolysis reactor. Next, the pyrolysis gas obtained from the pyrolysis treatment in the pyrolysis reactor is cooled to obtain pyrolysis crude oil. The pyrolysis oil is obtained by distillation separation of the pyrolysis crude oil, for example, by being subjected to a distillation column.

[0020] First, a mixture of raw materials is prepared (step S101), and this mixture is introduced into a thermal decomposition reactor for thermal decomposition treatment (step S102).

[0021] In this embodiment, the raw material mixture contains polyethylene and / or polypropylene, and further contains polystyrene. The proportions of polyethylene, polypropylene, and polystyrene per mixture are not particularly limited and can be appropriately determined by those skilled in the art. For example, the total amount of polyethylene and polypropylene per mixture can be 80% to 97% by weight. The content of polyethylene and / or polypropylene can be 90% to 95% by weight, or 93% to 95% by weight. The proportion of polystyrene can be 3% to 20% by weight per mixture. The proportion of polystyrene can be 5% to 10% by weight, or 5% to 7% by weight.

[0022] The polyethylene and / or polypropylene contained in the raw material mixture may be derived from waste plastic. Similarly, the polystyrene contained in the raw material mixture may be derived from waste plastic. Furthermore, the polystyrene contained in the mixture may be derived from a plastic other than polyethylene and / or polypropylene. In this specification, "waste plastic" refers to plastic contained in unwanted plastic products or used plastic products.

[0023] Furthermore, the raw material mixture may contain other components in addition to polyethylene and / or polypropylene and polystyrene, to the extent that the objectives of the present invention can be achieved, and is not particularly limited. Examples of other components include inorganic fillers such as polyvinyl chloride, talc, kaolin, calcium carbonate, silica, glass fiber, and zeolite, and organic fillers such as clay.

[0024] A mixture containing polyethylene and / or polypropylene and polystyrene may be pre-treated as necessary, such as by washing, grinding, or melting, before being subjected to thermal decomposition. If it is a ground material, its size is not particularly limited and can be appropriately determined by those skilled in the art. Similarly, if it is a molten material, its viscosity and other properties are not particularly limited and can be appropriately determined by those skilled in the art. Alternatively, polyethylene and / or polypropylene and polystyrene may be introduced into the pyrolysis reactor separately and mixed in the apparatus before the start of the pyrolysis process, or they may be introduced into the pyrolysis reactor already mixed.

[0025] The thermal decomposition of a mixture can be carried out, for example, by placing the mixture in a containment section of a thermal decomposition reactor and heating the mixture from outside the containment section in the substantially oxygen-free state, or by introducing a heating medium such as a high-temperature gas into the containment section and heating the mixture in contact with it. The high-temperature gas can be a gas that substantially does not contain oxygen (for example, a gas with an oxygen content of 1 volume percent or less). Specifically, the high-temperature gas can be a gas other than oxygen and oxides, such as inert gases such as nitrogen, argon, and helium, hydrogen, and hydrocarbons having 1 to 4 carbon atoms. The thermal decomposition reactor is not particularly limited and may be either batch type or continuous type. Examples of thermal decomposition reactors include kettle-type thermal decomposition reactors and rotary kiln-type thermal decomposition reactors.

[0026] The pyrolysis temperature in the pyrolysis process can be, for example, 460°C to 520°C. Furthermore, from the viewpoint of decomposition efficiency and the stability of fuel properties, the pyrolysis temperature is preferably 480°C to 520°C, and more preferably 490°C to 520°C. The pyrolysis temperature can be the set temperature for heating the housing section of the pyrolysis reactor.

[0027] Furthermore, in this embodiment, the pressure used for pyrolysis is not particularly limited and can be, for example, atmospheric pressure (1 atm). The residence time is also not particularly limited and can be set according to the pyrolysis reactor used. For example, in the case of a batch-type pyrolysis reactor, it can be 8 to 14 hours (5 to 10 hours for oil discharge), and in the case of a continuous-type pyrolysis reactor, the effective residence time can be about 1 hour (1 hour for preheating).

[0028] Furthermore, the pyrolysis treatment may be carried out in the presence or absence of a pyrolysis catalyst. As the pyrolysis catalyst, any known catalyst used in the petrochemical field can be applied, and both acidic and basic catalysts can be used. The pyrolysis catalyst may be either an acidic or basic catalyst. Examples of acidic catalysts include catalysts containing aluminosilicates. Examples of aluminosilicates include zeolites and smectite groups such as montmorillonite. Examples of catalysts containing montmorillonite include clays or minerals such as activated clay, acid clay, and bentonite. Examples of basic catalysts include carbonates such as sodium carbonate. On the other hand, in the pyrolysis treatment according to this embodiment, it is preferable to carry it out in the absence of a pyrolysis catalyst, as this simplifies the process.

[0029] Furthermore, in this embodiment, the pyrolysis gas temperature may be set to 200°C or higher and 300°C or lower for pyrolysis, or it can be set to 250°C or higher and 280°C or lower, or it can be set to 260°C or higher and 280°C or lower. The temperature of the pyrolysis gas can be adjusted by controlling the pyrolysis temperature and residence time, etc. In this specification, the temperature of the pyrolysis gas refers to the temperature of the gas produced by the pyrolysis process, specifically the temperature at which the oil discharge stabilizes. The temperature of the pyrolysis gas can be measured as the temperature of the gas at the gas outlet from the pyrolysis reactor. Furthermore, stable oil discharge means that no cloudiness is visible to the naked eye in the pyrolysis crude oil when subjected to the cooling process described later.

[0030] In this embodiment, the pyrolysis gas obtained by performing a pyrolysis treatment is cooled to obtain pyrolysis crude oil (step S103), and the pyrolysis oil is separated from the pyrolysis crude oil, for example by distillation separation (step S104). The cooling of the pyrolysis gas is not particularly limited and can be done by known methods, such as cooling by a condenser. As can be seen from Figure 2, in this embodiment, the pyrolysis crude oil is subjected to a separation process to separate the pyrolysis oil without any treatment to reduce the content of aromatic compounds in the pyrolysis crude oil. For example, the pyrolysis crude oil is subjected to a distillation separation process without any treatment to reduce the content of aromatic compounds, such as hydrogenation. Examples of aromatic compounds that may be contained in the pyrolysis crude oil and pyrolysis oil include styrene, toluene, benzene, and ethylbenzene.

[0031] Distillation separation can be performed by introducing pyrolysis gas into a distillation column and fractionating it based on the difference in boiling point ranges. The temperature range for fractionation should be appropriately set according to the specific gravity of the pyrolysis oil to be obtained. For example, if the density at 15°C is 0.785 g / cm³ from a temperature range of 180°C to 270°C, 3 More than 0.810g / cm 3 The following conditions can be met, and the pyrolysis oil can be recovered if its flash point is between 21°C and 70°C.

[0032] The pyrolysis oil obtained in this embodiment is manufactured using a mixture of polyethylene and / or polypropylene and polystyrene as raw materials, and contains aromatic compound components. In this embodiment, the wavenumber in the infrared absorption spectrum (microscopic external reflection method) is 3076 cm⁻¹.-1 A pyrolysis oil exhibiting an absorption peak can be obtained. When identifying the absorption peak in the infrared absorption spectrum (hereinafter also referred to as the IR spectrum), the obtained value should be within ±2 cm of the target value. -1 Within the range (preferably ±1 cm of the value) -1 It is sufficient if it is within the specified range.

[0033] The pyrolysis oil according to this embodiment may contain other components derived from polyethylene and / or polypropylene and polystyrene, for example, by being included in advance as a raw material or by being added after it is produced. Examples of such other components include antioxidants, stabilizers, rust inhibitors, and defoaming agents.

[0034] The mixed oil of this embodiment can be produced as a liquid oil at room temperature and atmospheric pressure by mixing the aforementioned paraffinic liquid hydrocarbon oil and pyrolysis oil. Specifically, in the production method according to this embodiment, the density of the resulting mixed oil at 15°C is 0.7870 g / cm³. 3 More than 0.8200g / cm 3 The following (preferably 0.7875 g / cm³) 3 More than 0.8200g / cm 3 The following can be achieved by mixing paraffinic liquid hydrocarbon oil and pyrolysis oil.

[0035] The mixing ratio of paraffinic liquid hydrocarbon oil and pyrolysis oil is adjusted as appropriate so that the density of the resulting mixed oil at 15°C falls within the above range, and is not particularly limited. For example, consider a pyrolysis oil obtained from a mixture containing 80% to 97% by weight of polyethylene and / or polypropylene, and 3% to 20% by weight of polystyrene. This pyrolysis oil can be mixed, for example, in an amount of 3% to 20% by weight relative to the total of the paraffinic liquid hydrocarbon oil and the pyrolysis oil. Preferably, the pyrolysis oil can be mixed in an amount of 5% to 10% by weight relative to the total of the paraffinic liquid hydrocarbon oil and the pyrolysis oil.

[0036] Furthermore, in the mixed oil of this embodiment, in addition to paraffinic liquid hydrocarbon oil and pyrolysis oil, diesel fuel may also be included. By including diesel fuel, it is possible to reduce the amount of fossil-derived diesel fuel used while preparing a fuel that is even more suitable depending on the infrastructure and engine specifications. In addition, the mixed oil of this embodiment may contain various fuel additives such as antioxidants, detergents and dispersants, and lubricity enhancers, depending on the purpose and application.

[0037] In this embodiment, the mixed oil has a flash point that is not particularly limited but can be 21°C or higher and less than 70°C. The flash point can be measured by JIS K 2265-1 "Method for determining the flash point - Part 1: Tag closure method," which applies to kerosene equivalent fractions such as high-pressure desulfurization cracked kerosene and hydrodesulfurization kerosene. Furthermore, in the mixed oil of this embodiment, although not particularly limited, the pour point can be, for example, -20°C to -5°C, or -20°C to -10°C. The pour point can be measured according to JIS K 2269 "Test Methods for Pour Point and Cloud Point of Crude Oil and Petroleum Products". Furthermore, in the mixed oil of this embodiment, although not particularly limited, the cetane index can be, for example, 61.0 or more and 71.0 or less. The cetane index can be measured according to JIS K 2280-5 "Petroleum products - Method for determining octane number, cetane number and cetane index".

[0038] As described above, according to this embodiment, by mixing a pyrolysis oil with a paraffinic liquid hydrocarbon oil to form a mixed oil, the kinematic viscosity at 40°C can be reduced compared to the case where the paraffinic liquid hydrocarbon oil is included as a component alone.

[0039] Furthermore, according to this embodiment, fuel characteristics can be controlled by design through a simple operation of mixing a pyrolysis oil with a paraffinic liquid hydrocarbon oil to adjust the density. Since the kinematic viscosity, pour point, flash point, and combustion characteristics change in conjunction with this density adjustment, fuel design tailored to specific applications is possible. For example, a mixed oil suitable for both non-public road applications (agricultural heaters, generators, tractors, construction machinery, etc.) and public road applications can be obtained as fuel for diesel engines.

[0040] Another aspect of the present invention provides a method for adjusting the density of a mixed oil at 15°C, comprising mixing a pyrolysis oil with a paraffinic liquid hydrocarbon oil derived from non-petroleum refining, wherein the pyrolysis oil is obtained by pyrolysis of a mixture containing polyethylene and / or polypropylene and polystyrene to produce pyrolysis gas, cooling the pyrolysis gas to obtain a pyrolysis crude oil, and separating the pyrolysis crude oil without any treatment to reduce the content of aromatic compounds. In this method, the density of the liquid hydrocarbon oil obtained by mixing at 15°C is, for example, 0.7870 g / cm³. 3 More than 0.8200g / cm 3 The following can be adjusted: [Examples]

[0041] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

[0042] The crushed polyethylene and crushed polystyrene were mixed in the mixing ratios shown in Table 1 and then thermally decomposed in a batch or continuous pyrolysis reactor. The pyrolysis temperature in the pyrolysis reactor was set to 490°C. The pressure was set to atmospheric pressure (1 atm), and the residence time was set to 8 to 14 hours for batch type reactors (5 to 10 hours for oil discharge) and approximately 1 hour for continuous type reactors (1 hour for preheating). The temperature of the pyrolysis gases obtained by thermal decomposition was set to be between 265°C and 275°C.

[0043] The pyrolysis gas obtained by thermal decomposition was cooled in a condenser to obtain crude pyrolysis oil. The obtained crude pyrolysis oil was subjected to distillation separation in a distillation column to obtain the pyrolysis oils of Reference Examples 1 to 3 from a temperature range of 180°C to 270°C.

[0044] Furthermore, a liquid hydrocarbon oil derived from 100% polyethylene was obtained by performing the same procedure, except that polystyrene was not mixed in.

[0045] [Table 1]

[0046] [Preparation and analysis of mixed oils] The pyrolysis oils of Reference Examples 1 to 3 were mixed with a liquid hydrocarbon oil derived from 100% polyethylene so that the pyrolysis oils of Reference Examples 1 to 3 constituted 7% by weight, to obtain the mixed oils of Examples 1 to 3.

[0047] Table 2 shows the physical property evaluation values ​​of the mixed oils obtained in Examples 1 to 3. The density at 15°C was measured according to JIS K 2249-1, "Test Methods for Density of Crude Oil and Petroleum Products, and Conversion Tables for Density, Mass, and Volume." The pour point was measured according to JIS K 2269, "Test Methods for Pour Point and Cloud Point of Crude Oil and Petroleum Products." The flash point was measured for kerosene equivalent fractions such as high-pressure desulfurization cracked kerosene and hydrodesulfurization kerosene, according to JIS K 2265-1 "Method for determining flash point - Part 1: Tag closure method". The cetane index was measured according to JIS K 2280-5 "Petroleum products - Method for determining octane number, cetane number, and cetane index". The sulfur content was measured according to JIS K 2541-4 "Crude oil and petroleum products - Test method for sulfur content: Radiation excitation method". The kinematic viscosity at 40°C was measured according to JIS K 2283 "Test Method for Kinematic Viscosity of Petroleum Products".

[0048] [Table 2]

[0049] As can be seen from Table 2, the viscosity of the mixed oil in the examples was lower compared to the liquid hydrocarbon oil derived from 100% polyethylene.

Claims

1. A mixed oil containing a paraffinic liquid hydrocarbon oil and a pyrolysis oil derived from non-petroleum refining, The pyrolysis oil is obtained by pyrolysis of a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas, cooling the pyrolysis gas to obtain pyrolysis crude oil, and separating the pyrolysis crude oil without any treatment to reduce the content of aromatic compounds. The density of the aforementioned mixed oil at 15°C is 0.7870 g / cm³. ３ More than 0.8200g / cm ３ The following is a mixed oil.

2. The mixed oil according to claim 1, wherein the mixture that serves as the raw material for the pyrolysis oil contains 80% by weight or more and 97% by weight or less of polyethylene and / or polypropylene, and 3% by weight or more and 20% by weight or less of polystyrene.

3. The mixed oil according to claim 2, wherein the mixing ratio of the pyrolysis oil is 3% by weight or more and 20% by weight or less relative to the total of the paraffinic liquid hydrocarbon oil and the pyrolysis oil.

4. The mixed oil according to claim 3, wherein the mixing ratio of the pyrolysis oil is 5% by weight or more and 10% by weight or less relative to the total of the paraffinic liquid hydrocarbon oil and the pyrolysis oil.

5. The mixed oil according to claim 1, further comprising diesel fuel.

6. The mixed oil is used as fuel, as described in any one of claims 1 to 5.

7. A method for producing mixed oils, This includes mixing paraffinic liquid hydrocarbon oil and pyrolysis oil, which are derived from non-petroleum refining. As the pyrolysis oil, a pyrolysis oil is used obtained by pyrolyzing a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas, cooling the pyrolysis gas to obtain crude pyrolysis oil, and separating the crude pyrolysis oil without performing any treatment to reduce the content of aromatic compounds. The density of the resulting mixed oil at 15°C is 0.7870 g / cm³. ３ More than 0.8200g / cm ３ The paraffinic liquid hydrocarbon oil and the pyrolysis oil are mixed as follows: A method for producing mixed oils.

8. This involves mixing a non-petroleum-derived paraffinic liquid hydrocarbon oil with a pyrolysis oil. The pyrolysis oil is obtained by pyrolyzing a mixture containing polyethylene and / or polypropylene and polystyrene to generate pyrolysis gas, cooling the pyrolysis gas to obtain crude pyrolysis oil, and separating the crude pyrolysis oil without any treatment to reduce the content of aromatic compounds. A method for adjusting the density of the resulting mixed oil at 15°C.

9. The density of the aforementioned mixed oil at 15°C is 0.7870 g / cm³. ３ More than 0.8200g / cm ３ The adjustment method according to claim 8, wherein the adjustment is performed as follows.

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