Fluid catalytic cracking residue, ethylene bottom oil, catalytic reforming residue, and feedstock oil for needle coke

Abstract

To provide a needle coke raw material oil that enables the effective utilization of heavy oil, comprising a fluid catalytic cracking residue, ethylene bottom oil, and catalytic reforming residue, and the fluid catalytic cracking residue and the ethylene bottom oil and / or catalytic reforming residue. [Solution] A needle coke raw material oil comprising either or both of ethylene bottom oil and catalytic reforming residue, and fluid catalytic cracking residue, wherein the density of the needle coke raw material oil at 15°C is 1.00 to 1.40 g / cm³. 3 The kinematic viscosity at 100°C is 17 mm³. 2 A feedstock oil for needle coke, having a viscosity of 0.2 / s or less and an asphaltene content of 8.5% by mass or less.

Description

[Technical Field]

[0001] The present invention relates to fluid catalytic cracking residue, ethylene bottom oil, catalytic reforming residue, and feedstock oil for needle coke. [Background technology]

[0002] Due to the decrease in demand for heavy oil, the effective utilization of surplus heavy oil is being considered. Examples of heavy oil include atmospheric distillation residue obtained by processing crude oil in an atmospheric distillation unit, vacuum distillation residue obtained by processing the atmospheric distillation residue in a vacuum distillation unit, fluid catalytic cracking residue obtained by fluid catalytic cracking reaction, ethylene bottom oil produced as a by-product of ethylene crackers using naphtha as a raw material, and catalytic reforming residue produced as a by-product of catalytic reforming using naphtha as a raw material.

[0003] As part of efforts to effectively utilize heavy oils, the production of carbon materials using heavy oils is being considered. Traditionally, coal residues have been mainly used in the production of carbon materials. Carbon materials have specific properties depending on their type, and these properties originate from the properties of the raw material oil. For example, if the carbon material is needle coke, raw material oil with appropriate density, kinematic viscosity, and asphaltene content is required for product quality and efficient production.

[0004] Patent Document 1 discloses a raw material oil composition for the negative electrode carbon material of a lithium-ion secondary battery, which uses the bottom oil of a residual oil fluid catalytic cracking apparatus and the residual oil of a vacuum distillation apparatus, or the bottom oil of a residual oil fluid catalytic cracking apparatus, the residual oil of a vacuum distillation apparatus, and the bottom oil of a fluid catalytic cracking apparatus as raw materials.

[0005] Patent Document 2 discloses a method for producing petroleum coke, characterized by coking a raw material oil containing a first heavy oil which is vacuum distillation residue with an initial boiling point of 300°C or higher, an asphalt content of 12% by mass or less, a saturation content of 50% by mass or more, and a sulfur content of 0.3% by mass or less, and a second heavy oil which is obtained by fluid catalytic cracking of a raw material oil containing atmospheric distillation residue, vacuum distillation residue, shale oil, tar sand bitumen, Orinoco tar, or heavy oil obtained by hydrorefining these, with an initial boiling point of 200°C or higher, a sulfur content of 0.5% by mass or less, and a nitrogen content of 0.2% by mass or less.

[0006] Patent Document 3 discloses a method for producing petroleum needle coke, which includes a step of coking a feedstock oil containing at least a light oil having a final boiling point of 380°C or lower and an asphaltene component of 0% by mass, and a heavy oil having an initial boiling point of 200°C or higher, an aromatic component of 50% by mass or more, a sulfur content of 0.5% by mass or less, and a nitrogen content of 0.2% by mass or less. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 5490636 [Patent Document 2] Patent No. 4809675 [Patent Document 3] Patent No. 6339105 [Overview of the project] [Problems that the invention aims to solve]

[0008] From the perspective of further flexible utilization of heavy oils derived from crude oil, it is necessary to manufacture carbon materials using raw material oils that are combinations of heavy oils other than those disclosed in the above-mentioned Patent Documents 1 to 3. The present invention has been made in view of the above circumstances, and an object thereof is to provide a fluid catalytic cracking residue, an ethylene bottoms oil, and a hydrocracking residue used as a feedstock for needle coke that enables effective utilization of heavy oil. Another object is to provide a feedstock for needle coke containing either one or both of the fluid catalytic cracking residue and either the ethylene bottoms oil or the hydrocracking residue.

Means for Solving the Problems

[0009] In order to solve the above problems, the present invention has the following aspects. [1] A fluid catalytic cracking residue for producing a feedstock for needle coke by mixing with either one or both of an ethylene bottoms oil and a hydrocracking residue, wherein the density of the feedstock for needle coke at 15 °C is 1.00 to 1.40 g / cm 3 and the kinematic viscosity at 100 °C is 17 mm 2 / s or less, and the asphaltene content is 8.5 mass% or less. [2] An ethylene bottoms oil for producing a feedstock for needle coke by mixing with a fluid catalytic cracking residue, wherein the density of the feedstock for needle coke at 15 °C is 1.00 to 1.40 g / cm 3 and the kinematic viscosity at 100 °C is 17 mm 2 / s or less, and the asphaltene content is 8.5 mass% or less. [3] A hydrocracking residue for producing a feedstock for needle coke by mixing with a fluid catalytic cracking residue, wherein the density of the feedstock for needle coke at 15 °C is 1.00 to 1.40 g / cm 3 and the kinematic viscosity at 100 °C is 17 mm 2 / s or less, and the asphaltene content is 8.5 mass% or less. [4] A feedstock for needle coke containing either one or both of an ethylene bottoms oil and a hydrocracking residue and a fluid catalytic cracking residue, wherein the density of the feedstock for needle coke at 15 °C is 1.00 to 1.40 g / cm 3 and the kinematic viscosity at 100 °C is 17 mm2 A feedstock oil for needle coke, having a density of 1.05 g / cm³ or less and an asphaltene content of 8.5 mass% or less at 15°C. [5] The feedstock oil for needle coke according to [4], wherein the total content of ethylene bottom oil, catalytic reforming residue oil, and fluid catalytic cracking residue oil in the total volume of the feedstock oil for needle coke is 80% by volume or more.

Advantages of the Invention

[0010] According to the present invention, it is possible to provide fluid catalytic cracking residue oil, ethylene bottom oil, and catalytic reforming residue oil used in a feedstock oil for needle coke that enables effective utilization of heavy oil. Further, it is possible to provide a feedstock oil for needle coke containing the fluid catalytic cracking residue oil and either one or both of the ethylene bottom oil and the catalytic reforming residue oil.

Modes for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail. However, the following description is an example of an embodiment of the present invention, and the present invention is not limited to these contents and can be implemented with modifications within the scope of the gist.

[0012] <Definitions> The definitions of the terms in this specification are as follows. Fluid catalytic cracking residue oil is the residue obtained by distilling the cracked oil obtained by bringing a feedstock oil into contact with a fluid catalytic cracking catalyst in a fluid catalytic cracking unit. Examples of the feedstock oil include atmospheric distillation residue, vacuum distillation residue, and vacuum gas oil obtained by treating atmospheric distillation residue with a vacuum distillation unit. That is, the fluid catalytic cracking unit includes a residue fluid catalytic cracking unit. Ethylene bottom oil is the residue by-produced in an ethylene cracker using naphtha as a raw material. Catalytic reforming residue oil is the residue by-produced in catalytic reforming using naphtha as a raw material.

[0013] The density at 15°C can be measured in accordance with JIS K 2249-1:2011 "Crude oil and petroleum products - Method for determining density - Part 1: Vibration method". The kinematic viscosity at 100 °C can be measured in accordance with JIS K 2283:2000 "Crude oil and petroleum products - Test method for kinematic viscosity and method for calculating viscosity index". The asphaltene content can be measured in accordance with JPI-5S-22-83 "Composition analysis of asphalt by column chromatography method". The sulfur content can be measured in accordance with JIS K 2541-4:2003 "Crude oil and petroleum products - Test method for sulfur content - Part 4: Radiation excitation method". The nitrogen content can be measured in accordance with JIS K 2609:1998 "Crude oil and petroleum products - Test method for nitrogen content". The ash content can be measured in accordance with JIS K2272:1998 "Crude oil and petroleum products - Test methods for ash and sulfuric acid ash". The quinoline-insoluble content can be measured in accordance with JIS K 2425:2006 "Test methods for creosote oil, processed tar and tar pitch". In this specification, the lower limit and upper limit of the parameter of the properties of the oil can be arbitrarily combined.

[0014] ≪Fluid catalytic cracking residue≫ The fluid catalytic cracking residue of this embodiment is a fluid catalytic cracking residue for producing a raw material oil for needle coke by mixing with either one or both of ethylene bottoms oil and catalytic reforming residue. By mixing the fluid catalytic cracking residue with either one or both of ethylene bottoms oil and catalytic reforming residue, the density of the raw material oil for needle coke at 15 °C can be adjusted to 1.00 - 1.40 g / cm 3 , the kinematic viscosity at 100 °C can be adjusted to 17 mm 2 / s or less, and the asphaltene content can be adjusted to 8.5 mass% or less.

[0015] The density of the fluid catalytic cracking residue at 15 °C is preferably 0.96 - 1.40 g / cm 3 , more preferably 1.00 - 1.40 g / cm 3 , and even more preferably 1.07 - 1.40 g / cm 3 . If the density of the fluid catalytic cracking residue at 15°C is within the aforementioned range, it becomes easier to adjust it to the density of the raw material oil for needle coke, as described later.

[0016] The kinematic viscosity of the residual fluid in catalytic cracking at 100°C is 50 mm². 2 It is preferable that the speed is less than or equal to 30 mm 2 It is more preferable that it be less than or equal to / s, and 20mm 2 It is even more preferable that the kinematic viscosity is less than or equal to / s. A lower limit of kinematic viscosity is, for example, 18 mm. 2 / s is one example. If the kinematic viscosity of the fluid catalytic cracking residue at 100°C is below the aforementioned upper limit, it becomes easier to adjust it to the kinematic viscosity of the needle coke raw material oil described later. Because the kinematic viscosity of the fluid catalytic cracking residue at 100°C is high, it is difficult to use it as is as a needle coke raw material oil. In the present invention, the kinematic viscosity can be adjusted by mixing it with either or both of ethylene bottom oil and catalytic reforming residue.

[0017] The asphaltene content of the fluid catalytic cracking residue is preferably 2.5% by mass or less, more preferably 2.0% by mass or less, and even more preferably 1.5% by mass or less. For example, the lower limit of the asphaltene content is 0.1% by mass. If the asphaltene content of the fluid catalytic cracking residue is below the aforementioned upper limit, it becomes easier to adjust it to the asphaltene content of the needle coke feedstock oil described later.

[0018] The sulfur content of the fluid catalytic cracking residue is preferably 1.40% by mass or less, more preferably 1.35% by mass or less, and even more preferably 1.10% by mass or less. The lower limit of the sulfur content is not particularly limited, but for example, it can be 0.1% by mass. The sulfur content of the fluid catalytic cracking residue may be high, for example, it may exceed 0.9% by mass. If the sulfur content of the fluid catalytic cracking residue is below the upper limit, it becomes easier to adjust it to the sulfur content of the needle coke raw material oil described later. Because the sulfur content of the fluid catalytic cracking residue is high, it may be difficult to use it as is as a needle coke raw material oil. In the present invention, the sulfur content can be adjusted by mixing it with either or both of ethylene bottom oil and catalytic reforming residue.

[0019] The nitrogen content of the fluid catalytic cracking residue is preferably 0.30% by mass or less, more preferably 0.25% by mass or less, and even more preferably 0.15% by mass or less. The lower limit of the nitrogen content is not particularly limited, but for example, it is 0.01% by mass. If the nitrogen content of the fluid catalytic cracking residue is below the aforementioned upper limit, it becomes easier to adjust it to the nitrogen content of the needle coke feedstock oil described later.

[0020] The ash content of the fluid catalytic cracking residue is preferably 0.5% by mass or less, more preferably 0.4% by mass or less, and even more preferably 0.1% by mass or less. The lower limit of the ash content is not particularly limited, but for example, it is 0.001% by mass. If the ash content of the fluid catalytic cracking residue is below the aforementioned upper limit, it becomes easier to adjust it to the ash content of the needle coke raw material oil described later.

[0021] The quinoline-insoluble content of the fluid catalytic cracking residue is preferably less than 0.3% by mass, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less. The lower limit of the quinoline-insoluble content is not particularly limited, but for example, it is 0.01% by mass. If the quinoline-insoluble content of the fluid catalytic cracking residue is below the aforementioned upper limit, it becomes easier to adjust it to the quinoline-insoluble content of the needle coke feedstock oil described later.

[0022] <<Ethylene bottom oil, catalytic reforming residue>> The ethylene bottom oil or catalytic reforming residue of this embodiment is an ethylene bottom oil or catalytic reforming residue for producing needle coke feedstock oil by mixing it with fluid catalytic cracking residue. By mixing the ethylene bottom oil or catalytic reforming residue with fluid catalytic cracking residue, the density of the needle coke feedstock oil at 15°C is increased to 1.00 to 1.40 g / cm³. 3 The kinematic viscosity at 100°C was 17 mm 2 The asphaltene content can be adjusted to 8.5% by mass or less, or to a minimum of / s.

[0023] The density of ethylene bottom oil at 15°C is 0.90–1.40 g / cm³. 3 Preferably, it is 0.91 to 1.30 g / cm³. 3 It is more preferable that the concentration be 0.92 to 1.20 g / cm³. 3 It is even more preferable that this be the case. If the density of the ethylene bottom oil at 15°C is within the aforementioned range, it becomes easier to adjust it to the density of the raw material oil for needle coke, as described later.

[0024] The kinematic viscosity of ethylene bottom oil at 100°C is 20 mm². 2 It is preferable that the value be less than or equal to / s, and 10 mm 2 It is more preferable that it be less than or equal to / s, and 6 mm 2 It is even more preferable that the kinematic viscosity is less than or equal to / s. A lower limit of kinematic viscosity is, for example, 1 mm². 2 / s is one example. If the kinematic viscosity of the ethylene bottom oil at 100°C is below the aforementioned upper limit, it becomes easier to adjust it to the kinematic viscosity of the needle coke raw material oil at 100°C, as described later.

[0025] The asphaltene content of the ethylene bottom oil is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less. For example, the lower limit of the asphaltene content is 8.6% by mass. If the asphaltene content of ethylene bottom oil is below the aforementioned upper limit, it becomes easier to adjust it to the asphaltene content of the needle coke raw material oil described later. Since the asphaltene content of ethylene bottom oil is high, it is difficult to use it as is as a needle coke raw material oil. In the present invention, the asphaltene content can be adjusted by mixing it with fluid catalytic cracking residue.

[0026] The sulfur content of the ethylene bottom oil is preferably 0.50% by mass or less, more preferably 0.30% by mass or less, and even more preferably 0.10% by mass or less. The lower limit of the sulfur content is not particularly limited, but for example, it is 0.01% by mass. If the sulfur content of the ethylene bottom oil is below the aforementioned upper limit, it becomes easier to adjust it to the sulfur content of the needle coke raw material oil described later.

[0027] The nitrogen content of the ethylene bottom oil is preferably 0.03% by mass or less, more preferably 0.02% by mass or less, and even more preferably 0.01% by mass or less. The lower limit of the nitrogen content is not particularly limited, but for example, it can be 0.001% by mass. If the nitrogen content of the ethylene bottom oil is below the upper limit, it becomes easier to adjust it to the nitrogen content of the needle coke feedstock oil described later.

[0028] The ash content of ethylene bottom oil is preferably 0.1% by mass or less, more preferably 0.01% by mass or less, and even more preferably 0.005% by mass or less. The lower limit of the ash content is not particularly limited, but for example, it is 0.001% by mass. If the ash content of the ethylene bottom oil is below the aforementioned upper limit, it becomes easier to adjust it to the ash content of the raw material oil for needle coke, as described later.

[0029] The quinoline-insoluble content of ethylene bottom oil is preferably less than 0.3% by mass, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less. The lower limit of the quinoline-insoluble content is not particularly limited, but for example, it is 0.01% by mass. If the quinoline-insoluble content of the ethylene bottom oil is below the aforementioned upper limit, it becomes easier to adjust it to the quinoline-insoluble content of the needle coke raw material oil described later.

[0030] The density of catalytic reforming residue at 15°C is 0.90–0.99 g / cm³. 3 Preferably, it is 0.91-0.98 g / cm³. 3 It is more preferable that the concentration be 0.92-0.97 g / cm³. 3 It is even more preferable that this is the case. Because the density of catalytic reforming residue is low at 15°C, it is difficult to use it as a raw material for needle coke as is. In the present invention, the density at 15°C can be adjusted by mixing it with fluid catalytic cracking residue.

[0031] The kinematic viscosity of the catalytic reforming residue at 100°C is 20 mm². 2 It is preferable that the value be less than or equal to / s, and 10 mm 2 It is more preferable that it be less than or equal to / s, and 6 mm 2 It is even more preferable that it be less than or equal to / s, and 3 mm 2 It is particularly preferable that the kinematic viscosity is less than or equal to / s. A lower limit of 0.1 mm² is used for kinematic viscosity. 2 / s is one example.

[0032] The asphaltene content of the catalytic reforming residue is preferably 1% by mass or less, more preferably 0.1% by mass or less, and even more preferably 0.01% by mass or less. An example of the lower limit of the asphaltene content is 0.001% by mass.

[0033] The sulfur content of the catalytic reforming residue is preferably 0.50% by mass or less, more preferably 0.30% by mass or less, and even more preferably 0.10% by mass or less. The lower limit of the sulfur content is not particularly limited, but for example, it is 0.001% by mass.

[0034] The nitrogen content of the catalytic reforming residue is preferably 0.03% by mass or less, more preferably 0.02% by mass or less, and even more preferably 0.01% by mass or less. The lower limit of the nitrogen content is not particularly limited, but for example, it is 0.001% by mass.

[0035] The ash content of the catalytic reforming residue is preferably 0.1% by mass or less, more preferably 0.01% by mass or less, and even more preferably 0.005% by mass or less. The lower limit of the ash content is not particularly limited, but for example, it is 0.001% by mass.

[0036] The quinoline-insoluble content of the catalytic reforming residue is preferably less than 0.3% by mass, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less. The lower limit of the quinoline-insoluble content is not particularly limited, but for example, it is 0.01% by mass.

[0037] Furthermore, when specifying "ethylene bottom oil and catalytic reforming residue," the lower and upper limits of the properties of the ethylene bottom oil and the lower and upper limits of the properties of the catalytic cracking oil may be used. In addition, the lower limit of the properties of the ethylene bottom oil and the upper limit of the properties of the catalytic cracking oil may be combined and used as a range. Moreover, the upper limit of the properties of the ethylene bottom oil and the lower limit of the properties of the catalytic cracking oil may be combined and used as a range.

[0038] ≪Raw oil for needle coke≫ The raw material oil for needle coke in this embodiment (hereinafter also simply referred to as "raw material oil") includes either or both of ethylene bottom oil and catalytic reforming residue, and fluid catalytic cracking residue. The density of the raw material oil at 15°C is 1.00 to 1.40 g / cm³. 3 The kinematic viscosity at 100°C is 17 mm³. 2 The saturates are less than or equal to / s, and the asphaltene content is 8.5% by mass or less.

[0039] The raw material oil comprises either or both of ethylene bottom oil and catalytic reforming residue, and fluid catalytic cracking residue. The total content of ethylene bottom oil, catalytic reforming residue, and fluid catalytic cracking residue relative to the total volume of the raw material oil is preferably 80% by volume or more, more preferably 90% by volume or more, and even more preferably 95% by volume or more. The total content of ethylene bottom oil, catalytic reforming residue, and fluid catalytic cracking residue relative to the total volume of the raw material oil may be 100% by volume.

[0040] The raw material oil may include ethylene bottom oil, catalytic reforming residue, and fluid catalytic cracking residue, as well as heavy extracts, which are particularly heavy oils extracted and removed by solvent extraction of lubricating oil base oils such as atmospheric distillation residue, vacuum distillation residue, vacuum distilled light oil, and hydrocracked heavy oil, as well as pyrolysis heavy oil, pyrolysis light oil, defatted oil, and coal tar residue. When the raw material oil contains vacuum distillation residue, the content of vacuum distillation residue relative to the total volume of the raw material oil is preferably 5% by volume or less, and more preferably 1% by volume or less. In one embodiment, it is preferable that the raw material oil does not contain vacuum distillation residue. The raw material oil may contain distillate oil, which is a light oil. When the raw material oil contains distillate oil, the content of distillate oil relative to the total volume of the raw material oil is preferably 5% by volume or less, more preferably less than 5% by volume, and even more preferably 1% by volume or less. In one embodiment, it is preferable that the raw material oil does not contain distillate oil.

[0041] The volume ratio of the total content of ethylene bottom oil and catalytic reforming residue to the content of fluid catalytic cracking residue is preferably 0.1 to 10, more preferably 0.1 to 5, and even more preferably 0.1 to 3. When the volume ratio is within the above range, it is easier to satisfy the properties of the raw material oil described later.

[0042] The volume ratio of ethylene bottom oil to the fluid catalytic cracking residue is preferably 0.1 to 15, more preferably 0.1 to 13, and even more preferably 0.1 to 10. When the volume ratio is within the above range, it is easier to satisfy the properties of the raw material oil described later.

[0043] The volume ratio of catalytic reforming residue to fluid catalytic cracking residue is preferably 0.01 to 10, more preferably 0.05 to 5, and even more preferably 0.1 to 1. When the volume ratio is within the above range, the properties of the raw material oil described later are more likely to be met.

[0044] When the raw material oil contains both ethylene bottom oil and catalytic reforming residue, the volume ratio of the catalytic reforming residue to the ethylene bottom oil content is more preferably 0.01 to 10, and even more preferably 0.1 to 5. When the volume ratio is within the above range, the properties of the raw material oil described later are more likely to be met.

[0045] The density of the raw material oil at 15°C is 1.00 to 1.40 g / cm³. 3 The concentration is 1.03-1.30 g / cm³. 3 Preferably, it is 1.07 to 1.30 g / cm³. 3 It is preferable that it be so. When the density is above the lower limit, the yield of needle coke tends to improve. When the density is below the upper limit, the influence of heavy components is reduced, and the formation and growth of mesophases proceed more easily.

[0046] The kinematic viscosity of the raw material oil at 100°C is 17 mm². 2 / s or less, 15mm 2 It is preferable that it is less than or equal to / s, and 12 mm 2 It is more preferable that the kinematic viscosity is less than or equal to / s. A lower limit of kinematic viscosity is, for example, 1.0 mm. 2 / s is one example. When the kinematic viscosity is below the aforementioned upper limit, oil can be easily and efficiently supplied through piping.

[0047] The asphaltene content of the raw material oil is 8.5% by mass or less, preferably 8.0% by mass or less, and more preferably 5.0% by mass or less. An example of the lower limit of the asphaltene content is 0.1% by mass. If the asphaltene content is below the aforementioned upper limit, it becomes difficult to generate needle coke with a complex structure through early coking.

[0048] The sulfur content of the raw material oil is preferably 0.90% by mass or less, more preferably 0.80% by mass or less, and even more preferably 0.70% by mass or less. The lower limit of the sulfur content is not particularly limited, but for example, it is 0.10% by mass. When the sulfur content is below the aforementioned upper limit, the buffing of the resulting needle coke can be sufficiently suppressed, and the coefficient of thermal expansion also tends to be low.

[0049] The nitrogen content of the raw material oil is preferably 0.20% by mass or less, more preferably 0.15% by mass or less, and even more preferably 0.10% by mass or less. The lower limit of the nitrogen content is not particularly limited, but for example, it is 0.01% by mass. When the nitrogen content is below the aforementioned upper limit, the buffing of the resulting needle coke can be sufficiently suppressed, and the coefficient of thermal expansion also tends to be low.

[0050] The ash content of the raw material oil is preferably 0.1% by mass or less, more preferably 0.05% by mass or less, and even more preferably 0.04% by mass or less. The lower limit of the ash content is not particularly limited, but for example, it is 0.01% by mass. When the ash content is below the aforementioned upper limit, the formation and growth of mesophases proceed more easily.

[0051] The quinoline-insoluble content of the raw material oil is preferably less than 0.3% by mass, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less. The lower limit of the quinoline-insoluble content is not particularly limited, but for example, it is 0.01% by mass. If the quinoline-insoluble content is below the aforementioned upper limit, the formation and growth of the mesophase in the initial stages of coking are more likely to proceed.

[0052] <Method for manufacturing raw oil> The mixing of fluid catalytic cracking residue with either or both ethylene bottom oil and catalytic reforming residue may be carried out by tank blending or line blending. Tank blending is a mixing method in which fluid catalytic cracking residue in a tank (storage tank) is mixed with raw material oils containing either or both ethylene bottom oil and catalytic reforming residue using a stirring device such as a jet mixer or propeller mixer for, for example, several hours, to adjust the properties of the resulting mixed oil. Line blending is a mixing method in which fluid catalytic cracking residue is mixed with multiple types of raw material oils containing either or both ethylene bottom oil and catalytic reforming residue in a line (transport pipe) by creating turbulence, to adjust the properties of the resulting mixed oil. Tank blending or line blending may be carried out, for example, at a crude oil storage base or refinery. Note that the mixing method used in the raw material oil production method of this embodiment is not limited to tank blending or line blending. Furthermore, tank blending may also be carried out as cargo hold blending. Cargo hold blending is a type of tank blending described above, meaning that the raw material oils, which include fluid catalytic cracking residue and either or both of ethylene bottom oil and catalytic reforming residue, are blended in the cargo hold (tank) during transport. Cargo hold blending eliminates the need to maintain separate tanks for blending and allows for efficient mixing.

[0053] <Method for producing needle coke> Needle coke can be manufactured by a process of coking the above-mentioned raw material oil and a process of calcining the coke produced by coking.

[0054] Examples of caulking methods include delayed caulking, screw breaking, flexi-caulking, the Yurika process, and H-Oil. In delayed caulking, the raw material oil is rapidly passed through a heated tube while being heated before being introduced into a coke drum where caulking proceeds. The conditions for caulking are not particularly limited. The heating temperature for caulking may be, for example, 400-600°C or 450-550°C. The heating time may be, for example, 24-72 hours or 36-60 hours.

[0055] Coke can be calcined using calcination equipment such as a rotary kiln or a shaft furnace. The calcination temperature may be, for example, 1000 to 1500°C. The calcination time may be, for example, 2 to 6 hours.

[0056] Needle coke can be used as aggregate for graphite electrodes in electric steelmaking and as carbon material for lithium-ion secondary batteries.

[0057] <Mechanism of Action> As shown in the comparative examples described later, using only fluid catalytic cracking residue as a raw material oil presents the problem of high kinematic viscosity. Using only ethylene bottom oil as a raw material oil presents the problem of high asphaltene content. Using only catalytic reforming residue as a raw material oil presents the problem of low density. Therefore, it is difficult to use fluid catalytic cracking residue, ethylene bottom oil, or catalytic reforming residue individually as raw material oils for needle coke. On the other hand, the inventors of this application have found that by mixing fluid catalytic cracking residue with one or both of ethylene bottom oil and catalytic reforming residue, the shortcomings of each (the problems mentioned above) can be compensated for. Note that while sulfur content, nitrogen content, etc., are weighted averages in the mixed oil, kinematic viscosity, asphaltene content, etc., are not necessarily weighted averages. Furthermore, this invention always uses two or more types of heavy oil, contributing to the effective utilization of heavy oil. [Examples]

[0058] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0059] <Analysis of properties> (density) The density at 15°C was measured in accordance with JIS K 2249-1:2011 "Crude oil and petroleum products - Method for determining density - Part 1: Vibration method".

[0060] (Kinematic viscosity) The kinematic viscosity at 100°C was measured in accordance with JIS K 2283:2000 "Crude oil and petroleum products - Test method for kinematic viscosity and method for calculating viscosity index".

[0061] (Asphaltene content) The asphaltene content was measured in accordance with JPI-5S-22-83 "Compositional Analysis of Asphalt by Column Chromatography".

[0062] (Sulfur content) The sulfur content was measured in accordance with JIS K 2541-4:2003 "Crude oil and petroleum products - Test methods for sulfur content Part 4: Radiation excitation method".

[0063] (Nitrogen content) Nitrogen content was measured in accordance with JIS K 2609:1998 "Crude oil and petroleum products - Test methods for nitrogen content".

[0064] (ash) Ash content was measured in accordance with JIS K2272:1998 "Crude oil and petroleum products - Test methods for ash content and sulfated ash content".

[0065] (Quinoline-insoluble content) Quinoline-insoluble content was measured in accordance with JIS K 2425:2006 "Test Methods for Creosote Oil, Processed Tar, and Tar Pitch".

[0066] <Raw materials> The fluid catalytic cracking residue, ethylene bottom oil, and catalytic reforming residue with the properties described in Table 1 were used.

[0067] [Table 1]

[0068] [Example 1] A feedstock oil was prepared by mixing fluid catalytic cracking residue and ethylene bottom oil. The feedstock oil consisted of 90% fluid catalytic cracking residue and 10% ethylene bottom oil by volume. The density at 15°C, kinematic viscosity at 100°C, asphaltene content, sulfur content, nitrogen content, ash content, and quinoline-insoluble content of the obtained feedstock oil were measured using the method described above. The results are shown in Table 2.

[0069] [Examples 2-5] The raw material oil was prepared in the same manner as in Example 1, except that the fluid catalytic cracking residue and ethylene bottom oil were mixed in the proportions shown in Table 2. The density at 15°C, kinematic viscosity at 100°C, asphaltene content, sulfur content, nitrogen content, ash content, and quinoline-insoluble content of the obtained raw material oil were measured using the method described above. The results are shown in Table 2.

[0070] [Examples 6-7] The residue from fluid catalytic cracking and catalytic reforming were mixed according to the formulations shown in Table 2. The density at 15°C, kinematic viscosity at 100°C, asphaltene content, sulfur content, nitrogen content, ash content, and quinoline-insoluble content of the obtained raw materials were measured using the method described above. The results are shown in Table 2.

[0071] [Comparative Example 1] Only the residue from fluid catalytic cracking was used as the raw material. The density at 15°C, kinematic viscosity at 100°C, asphaltene content, sulfur content, nitrogen content, ash content, and quinoline-insoluble content of the raw material were measured using the method described above. The results are shown in Table 2.

[0072] [Comparative Example 2] Only ethylene bottom oil was used as the raw material. The density at 15°C, kinematic viscosity at 100°C, asphaltene content, sulfur content, nitrogen content, ash content, and quinoline-insoluble content of the raw material oil were measured using the method described above. The results are shown in Table 2.

[0073] [Comparative Example 3] Only the residual oil from catalytic reforming was used as the raw material. The density at 15°C, kinematic viscosity at 100°C, asphaltene content, sulfur content, nitrogen content, ash content, and quinoline-insoluble content of the raw material were measured using the method described above. The results are shown in Table 2.

[0074] [Table 2]

[0075] In Comparative Example 1, which used only fluid catalytic cracking residue as a raw material, the kinematic viscosity was high, making it difficult to transport the oil through piping, resulting in poor needle coke production efficiency. Furthermore, the high sulfur content prevented puffing of the resulting needle coke, and the thermal expansion coefficient also tended to be high. In Comparative Example 2, which used only ethylene bottom oil as a raw material, the high asphaltene content made it easy to produce needle coke with a complex structure due to early coking. In Comparative Example 3, which used only catalytic reforming residue as a raw material, the density was low, resulting in a low needle coke yield. On the other hand, in Examples 1-5, which included both fluid catalytic cracking residue and ethylene bottom oil, the density, kinematic viscosity, and impurity content were within appropriate ranges. It was found that the ethylene bottom oil compensated for the high kinematic viscosity and sulfur content of the fluid catalytic cracking residue, and the fluid catalytic cracking residue compensated for the high asphaltene content of the ethylene bottom oil. In addition, in Examples 6-7, which included both fluid catalytic cracking residue and catalytic reforming residue, the density, kinematic viscosity, and impurity content were within appropriate ranges. It was found that the catalytic reforming residue compensates for the high kinematic viscosity and sulfur content of the fluid catalytic cracking residue, and the fluid catalytic cracking residue compensates for the low density of the catalytic reforming residue. [Industrial applicability]

[0076] The needle coke raw material oil of the present invention is useful because it uses surplus heavy oils such as fluid catalytic cracking residue, ethylene bottom oil, and catalytic reforming residue.

Claims

1. A fluid catalytic cracking residue for producing needle coke feedstock oil by mixing with either or both of ethylene bottom oil and catalytic reforming residue, The density of the aforementioned needle coke raw material oil at 15°C is 1.00 to 1.40 g / cm³. ３ The kinematic viscosity at 100°C is 17 mm². ２ Fluid catalytic cracking residue having a coefficient of 1 / s or less and an asphaltene content of 8.5% by mass or less.

2. Ethylene bottom oil for mixing with fluid catalytic cracking residue to produce raw material oil for needle coke, The density of the aforementioned needle coke raw material oil at 15°C is 1.00 to 1.40 g / cm³. ３ The kinematic viscosity at 100°C is 17 mm². ２ Ethylene bottom oil having a viscosity of 0.5% or less and an asphaltene content of 8.5% by mass or less.

3. A catalytic reforming residue for producing needle coke feedstock oil by mixing with fluid catalytic cracking residue, The density of the aforementioned needle coke raw material oil at 15°C is 1.00 to 1.40 g / cm³. ３ The kinematic viscosity at 100°C is 17 mm². ２ A catalytic reforming residue having a coefficient of 1 / s or less and an asphaltene content of 8.5% by mass or less.

4. A needle coke feedstock comprising either or both of ethylene bottom oil and catalytic reforming residue, and fluid catalytic cracking residue, The density of the aforementioned needle coke raw material oil at 15°C is 1.00 to 1.40 g / cm³. ３ The kinematic viscosity at 100°C is 17 mm². ２ A feedstock oil for needle coke, having a viscosity of 0.2 / s or less and an asphaltene content of 8.5% by mass or less.

5. The needle coke raw material oil according to claim 4, wherein the total content of ethylene bottom oil, catalytic reforming residue, and fluid catalytic cracking residue relative to the total volume of the needle coke raw material oil is 80% by volume or more.

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