Method for storing heavy oil composition and method for producing heavy oil composition

Abstract

To provide a heavy oil composition whose sulfur content is reduced to 0.50 mass% or less, having excellent ignitability while controlling the kinetic viscosity thereof within an intended range, exhibiting excellent storage stability by itself, and capable of exhibiting excellent storage stability subsequent to being blended with another heavy oil composition.SOLUTION: A heavy oil composition is characterized by containing 35 to 70 vol.% of directly desulfurized heavy oil, and 30 to 65 vol.% of one or more obtained from catalytically cracked residue oil and catalytically cracked light oil in total, with its sulfur content being equal to or lower than 0.50 mass%, its kinetic viscosity at 50°C being equal to or higher than 20.00 mm2 / second, its CCAI being equal to or lower than 870, the amount of latent sediment being equal to or lower than 0.10 mass%, and the amount of increase in sediment subsequent to aging for 48 hours being 0.02 mass% or less, which is calculated from the formula: (the amount of sediment after aging for 48 hours at 100°C)-(the amount of the latent sediment).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a heavy oil composition and a method for storing a heavy oil composition. [Background technology]

[0002] Heavy oil compositions have traditionally been used for a variety of purposes in various industrial fields, and are classified into three types according to kinematic viscosity in JIS K2205: Type 1 (heavy oil A), Type 2 (heavy oil B), and Type 3 (heavy oil C). Of these heavy oil compositions, heavy oil A is generally used as fuel oil for heaters for greenhouse heating and heaters for buildings, etc., while heavy oil B and heavy oil C are generally used as fuel oil for large diesel engines on ships and for large-scale boilers in factories, power plants, district heating and cooling systems, etc.

[0003] Of these, heavy oil C has a higher viscosity than other heavy oils, so its base blend is also different from other heavy oils, and it is usually made by blending a small proportion of light oil fraction with vacuum residue.

[0004] In recent years, from the viewpoint of reducing the environmental load and inhibiting flue corrosion, reduction in the sulfur content of residual oils used as heavy oil base materials has been studied, and there is a demand for heavy oil compositions using such low-sulfur base materials. In particular, for heavy oil compositions equivalent to C heavy oil used as marine fuel, the sulfur content is being gradually regulated by an international treaty (MARPOL Convention) established by the IMO (International Maritime Organization), and in the future it will be required to reduce it to 0.50 mass% or less.

[0005] In addition, heavy oil compositions equivalent to C heavy oil, that is, heavy oil compositions used in internal combustion engines, are required to have excellent ignition and combustibility. The calculated carbon aromaticity index (CCAI), calculated from the density of the heavy oil composition at 15°C and the kinematic viscosity at 50°C, is known as an index of the ignition ability of a heavy oil composition equivalent to C heavy oil, and it is generally believed that the higher the CCAI of a heavy oil composition, the lower its ignition ability.

[0006] Furthermore, because heavy oil C is handled while heated, it is required to have various performance characteristics when used, such as an appropriate kinematic viscosity when injected into a combustor.

[0007] In many cases, heavy oil C is stored in tanks such as shipping tanks, tanks at secondary bases after shipping, and tanks on ships after production, and is used little by little, so there is a demand for heavy oil compositions that are stable enough to withstand long-term storage. As a heavy oil composition having such long-term storage stability, a heavy oil composition has been proposed that contains directly desulfurized heavy oil and at least one of slurry oil and catalytically cracked light oil, and in which the ratio of the asphaltene content to the sum of the aromatic content and the resin content relative to the total mass of the composition is 0.090 or less (see Patent Document 1 (JP 2018-165365 A)). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2018-165365 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0009] According to the fuel oil composition described in Patent Document 1, it is possible to provide a fuel oil composition that is low in sulfur and has excellent storage stability.

[0010] However, because C heavy oil is intermittently supplied to the shipping tanks, tanks at secondary bases, tanks on ships, etc., C heavy oils with different properties are mixed and stored, which has led to a demand for C heavy oil that has excellent storage stability even after being mixed with other C heavy oils.

[0011] Regarding the storage stability of heavy oil compositions consisting of a mixture of two or more of the above-mentioned C heavy oils, ISO / PAS 23263:2019, which specifies marine fuel oils, states that "When two stable fuel oils are mixed together, it does not necessarily follow that a stable mixture will be formed. When storing fuel, this should be kept in mind."

[0012] Furthermore, in light of the recent sulfur content restrictions under the MARPOL Convention, there has been discussion about the blending stability of heavy oil compositions, that is, the stability of blended oils made by blending two or more C heavy oils.

[0013] Thus, conventionally, no C heavy oil has been known that has excellent storage stability even when mixed with other C heavy oils. In particular, most C heavy oils contain directly desulfurized heavy oil as the main base material, and have a kinematic viscosity of 20.00 mm at 50°C. 2 / sec or more, CCAI of 870 or less, and potential sediment amount of 0.10 mass% or less, there has been a demand for C heavy oil that exhibits excellent storage stability even when mixed with such C heavy oil.

[0014] Under these circumstances, the present invention aims to provide a heavy oil composition that has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both alone and after mixing with other heavy oil compositions, and to provide a method for storing the heavy oil composition. [Means for solving the problem]

[0015] In order to solve the above problems, the present inventors have discovered a direct desulfurized heavy oil, a catalytic cracking residual oil, and one or more components obtained from catalytic cracking light oil, each in a specific content ratio, which has a sulfur content of 0.50 mass% or less and a kinematic viscosity at 50°C of 20.00 mm 2 The present inventors have found that the above technical problems can be solved by a heavy oil composition having a PVD of 0.1 / sec or more, a CCAI of 870 or less, a potential sediment content of 0.10 mass% or less, and an increase in sediment content after 48 hours of aging calculated by "amount of sediment after 48 hours aging at 100°C - amount of potential sediment" of 0.02 mass% or less, and have completed the present invention based on this finding.

[0016] That is, the present invention provides: (1) Contains 35% to 70% by volume of directly desulfurized heavy oil and 30 to 65% by volume in total of one or more of catalytic cracking residual oil and catalytic cracking light oil; Sulfur content of 0.50% by mass or less, Kinematic viscosity at 50°C is 20.00mm 2 / seconds or more, CCAI is 870 or less, The potential sediment content is 0.10% by mass or less; The sediment increase due to 48 hours of aging, calculated by subtracting the potential sediment amount from the sediment amount after 48 hours of aging at 100°C, is 0.02% by mass or less. A heavy oil composition characterized by: (2) The heavy oil composition according to (1) above, It contains direct desulfurized heavy oil as the main base material and has a kinematic viscosity of 20.00 mm at 50°C. 2 / sec or more, CCAI of 870 or less, and potential sediment amount of 0.10 mass% or less, The heavy oil composition described in (1) above is mixed and stored in a state where the content is 20 to 80% by volume. A method for storing a heavy oil composition, comprising: This provides: [Effects of the Invention]

[0017] According to the present invention, a heavy oil composition is provided which has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both alone and after mixing with other heavy oil compositions, and a method for storing the heavy oil composition is also provided. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail. In this specification, the use of "to" to indicate a range of values ​​indicates a range that includes the values ​​stated as the upper and lower limits. When a unit is stated for only the upper limit of a range of values ​​expressed by "to," this means that the lower limit is also expressed in the same unit. In the numerical ranges described in stages in this specification, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. In this specification, the content or amount of each component in a composition means, unless otherwise specified, the total content or amount of the multiple substances present in the composition when multiple substances corresponding to each component are present in the composition. As used herein, combinations of preferred embodiments are more preferred embodiments.

[0019] In this specification, unless otherwise specified, the values ​​of the following items are values ​​determined using the following test methods and calculations. · "Density at 15°C"; JIS K 2249-1 (2011) "Crude petroleum products and petroleum products - Density test method" · "Sulfur content"; Depending on the sulfur content of the sample to be measured, the measurement was performed using either Measurement Method 1 or Measurement Method 2 below. Measurement method 1 (sulfur content 0.0051% by mass or more): "Radiation excitation method" as specified in JIS K 2541-4 (2003) "Crude oil and petroleum products - Sulfur content test method" Measurement method 2 (sulfur content 0.0050% by mass or less): "Crude oil and petroleum products - Sulfur content test method" (ultraviolet fluorescence method) specified in JIS K 2541-6 (2013). "Nitrogen content" "Crude oil and petroleum products - Nitrogen analysis test method" (chemiluminescence method) specified in JIS K 2609 (1998). "Kinematic viscosity at 50°C"; JIS K 2283 (2000) "Crude oil and petroleum products - Kinematic viscosity test method" · "CCAI"; It means a value calculated by the calculation method shown in the following formula (α). CCAI=D-140.7log 10 log 10 (V+0.85)-80.6 (α) In the formula (α), D is the density (kg / m) at 15°C measured by the above method. 3 ), V is the kinematic viscosity (mm 2 / s). "Potential sediment volume" This refers to the value (mass%) measured after aging in accordance with procedure A "Thermal Aging" specified in ISO 10307-2:2009 "Petroleum products - Total sediment in residual fuel oils - Part 2: Determination using standard procedures for aging." "Sediment volume after aging at 100°C for 48 hours" This refers to the value (mass%) measured after aging in accordance with procedure A "Thermal Aging" specified in ISO 10307-2:2009 "Petroleum products - Total sediment in residual fuel oils - Part 2: Determination using standard procedures for aging" and then increasing the aging time by an additional 24 hours (total aging time: 48 hours). "Sediment increase after 48 hours of aging" Based on the above "Potential Sediment Amount (mass%)" and "Sediment Amount (mass%) after aging at 100°C for 48 hours", the following formula "Sediment amount (mass%) after aging at 100°C for 48 hours - Potential sediment amount (mass%)" This means the sediment increase (mass%) calculated by "Actual sediment volume" This refers to the value (mass%) measured in accordance with ISO 10307-1:2009 "Petroleum products—Total sediment in residual fuel oils—." "Carbon residue" The carbon residue refers to the value measured in accordance with JIS K2270 "Crude oil and petroleum products - Determination of carbon residue." "Boiling point range in atmospheric distillation" The boiling point range in atmospheric distillation means the value measured in accordance with JIS K2254:2018 "Petroleum products - Determination of distillation properties." "Distillation properties in gas chromatographic distillation test method" This refers to the value measured by the method specified in ASTM D 6352 "Standard Test Method for Boiling Range Distribution of Petroleum Distillates in the Boiling Range from 174°C to 700°C by Gas Chromatography."

[0020] First, the heavy oil composition according to the present invention will be described. The heavy oil composition of the present invention contains 35% by volume to 70% by volume of directly desulfurized heavy oil, and 30% by volume to 65% by volume in total of one or more of catalytically cracked residual oil and catalytically cracked light oil, Sulfur content of 0.50% by mass or less, Kinematic viscosity at 50°C is 20.00mm 2 / seconds or more, CCAI is 870 or less, The potential sediment content is 0.10% by mass or less; After aging at 100°C for 48 hours, the sediment increase calculated by subtracting the potential sediment amount from the sediment amount is 0.02% by mass or less. It is characterized by the following.

[0021] The heavy oil composition according to the present invention contains 35% to 70% by volume of directly desulfurized heavy oil.

[0022] Directly desulfurized heavy oil is a heavy fraction obtained by hydrodesulfurizing atmospheric distillation residue, vacuum distillation residue, or a mixture thereof. The direct desulfurization apparatus used for hydrodesulfurization is not particularly limited, and known apparatuses can be used.

[0023] Compared to vacuum distillation residual oil, which has traditionally been used as a heavy base material for constituting heavy oil compositions, directly desulfurized heavy oil is more susceptible to sedimentation due to heat and other factors received in the desulfurization process, and such sedimentation can sometimes cause poor combustion. However, the heavy oil composition of the present invention contains a predetermined amount of directly desulfurized heavy oil, as well as a predetermined amount of one or more components obtained from catalytic cracking residual oil and catalytic cracking light oil, as described below, and the sulfur content, kinematic viscosity at 50°C, CCAI, potential sediment amount, and the sediment increase due to 48 hours of aging, calculated by ``sediment amount after 48 hours aging at 100°C - potential sediment amount'', are controlled to predetermined values, so that the heavy oil composition can exhibit good storage stability on its own and can also exhibit good storage stability after mixing with other heavy oil compositions.

[0024] Furthermore, directly desulfurized heavy oil has a lower sulfur content than vacuum distillation residual oil, which is used as the main base material for conventional heavy oil compositions. Therefore, by including directly desulfurized heavy oil in a heavy oil composition, the sulfur content in the composition can be reduced and the kinematic viscosity can be easily adjusted to a level suitable for the heavy oil composition.

[0025] The directly desulfurized heavy oil preferably has a sulfur content of 0.50% by mass or less, more preferably 0.10% to 0.47% by mass, and even more preferably 0.10% to 0.45% by mass. It is preferable that the sulfur content in directly desulfurized heavy oil is as low as possible, but if an attempt is made to reduce the sulfur content in directly desulfurized heavy oil excessively, it is likely to lead to increased costs, such as restrictions on the desulfurized feedstock or the need for harsh processing conditions. By ensuring that the sulfur content of the directly desulfurized heavy oil is within the above range, the sulfur content of the heavy oil composition can be easily adjusted.

[0026] The directly desulfurized heavy oil preferably has a nitrogen content of 0.05% by mass to 0.20% by mass, more preferably 0.05% by mass to 0.19% by mass, and even more preferably 0.05% by mass to 0.18% by mass. By ensuring that the nitrogen content of the directly desulfurized heavy oil is within the above range, the nitrogen content of the heavy oil composition can be easily adjusted.

[0027] The directly desulfurized heavy oil preferably has a residual carbon content of 2.00 mass % to 10.00 mass %, more preferably 3.00 mass % to 8.00 mass %, and even more preferably 4.00 mass % to 7.00 mass %. In the heavy oil composition according to the present invention, the residual carbon content of the directly desulfurized heavy oil is controlled within the above range, so that carbon formation in the combustion chamber can be effectively suppressed.

[0028] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil has a density of 0.9000 g / cm at 15°C. 3 ~0.9370g / cm 3 Preferably, it is 0.9100 g / cm 3 ~0.9350g / cm 3 More preferably, it is 0.9200 g / cm 3 ~0.9330g / cm 3 It is more preferable that: A heavy oil composition prepared using directly desulfurized heavy oil having a density at 15°C within the above range can increase the calorific value per volume and easily suppress uneven combustion and combustion failure.

[0029] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil has a kinematic viscosity at 50°C of 80.00 mm 2 / s~270.0mm 2 / s is preferred, and 82.00 mm 2 / s~270.0mm 2 / smm 2 / s is more preferable, and 84.00 mm 2 / s~270.0mm 2 / s is even more preferred. Heavy oil compositions prepared using directly desulfurized heavy oils having a kinematic viscosity at 50°C within the above range exhibit good atomization when used in internal combustion engines, making it possible to suppress uneven combustion and misfires, and also to stably supply the heavy oil composition to the engine.

[0030] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil preferably has a CCAI of 810 or less, more preferably 790-808, and even more preferably 790-806. In the heavy oil composition according to the present invention, since the CCAI of the directly desulfurized heavy oil is within the above range, the heavy oil composition prepared using the directly desulfurized heavy oil within the above range can easily exhibit good ignition properties.

[0031] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil preferably has an actual sediment amount of 1.00% by mass or less (0.00% by mass to 1.00% by mass), more preferably 0.95% by mass or less (0.00% by mass to 0.95% by mass), and even more preferably 0.90% by mass or less (0.00% by mass to 0.90% by mass).

[0032] In the heavy oil composition according to the present invention, the amount of actual sediment in the directly desulfurized heavy oil is controlled within the above range, so that the generation of sediment can be effectively suppressed.

[0033] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil preferably has a latent sediment amount of 1.30% by mass or less (0.00% by mass to 1.30% by mass), more preferably 1.20% by mass or less (0.00% by mass to 1.20% by mass), and even more preferably 1.10% by mass or less (0.00% by mass to 1.10% by mass).

[0034] In the heavy oil composition of the present invention, the potential sediment amount of the directly desulfurized heavy oil is controlled within the above range, and therefore the generation of sediment during storage can be effectively suppressed.

[0035] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil preferably has a 10.0% by volume distillation temperature (T10) measured by a gas chromatographic distillation test method of 330.0°C to 450.0°C, more preferably 340.0°C to 440.0°C, and even more preferably 350.0°C to 430.0°C.

[0036] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil preferably has a 50.0% by volume distillation temperature (T50) measured by a gas chromatographic distillation test method of 450.0°C to 580.0°C, more preferably 460.0°C to 570.0°C, and even more preferably 470.0°C to 560.0°C.

[0037] In the heavy oil composition according to the present invention, the directly desulfurized heavy oil preferably has a 90.0% by volume distillation temperature (T90) measured by gas chromatography distillation test method of 580.0°C to 700.0°C, more preferably 590.0°C to 690.0°C, and even more preferably 600.0°C to 680.0°C.

[0038] In the heavy oil composition of the present invention, the distillation temperatures of the directly desulfurized heavy oil measured by the gas chromatography distillation test method are within the above ranges, so that when the heavy oil is blended into the heavy oil composition, it is easy to control the kinematic viscosity at 50°C and CCAI to predetermined values, and good fluidity and ignition properties can be maintained.

[0039] In the heavy oil composition according to the present invention, the content of directly desulfurized heavy oil is 35% to 70% by volume, preferably 35% to 65% by volume, and more preferably 35% to 60% by volume.

[0040] The heavy oil composition of the present invention contains a predetermined amount of directly desulfurized heavy oil, as well as a predetermined amount of one or more components obtained from catalytic cracking residual oil and catalytic cracking light oil, as described below, and the sulfur content, kinematic viscosity at 50°C, CCAI, potential sediment amount, and the sediment increase due to 48 hours of aging, calculated by ``sediment amount after 48 hours aging at 100°C - potential sediment amount'', are controlled to predetermined values.This makes it possible to provide a heavy oil composition that has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both alone and after mixing with other heavy oil compositions.

[0041] The heavy oil composition according to the present invention contains 30 to 65% by volume in total of one or more components obtained from catalytically cracked residual oil and catalytically cracked gas oil.

[0042] Catalytic cracking residue refers to the residual fraction obtained when heavy oil is catalytically cracked in a fluid catalytic cracking unit or a residual oil fluid catalytic cracking unit, i.e., slurry oil (SLO), and clarified oil (CLO) obtained by removing or reducing impurities such as catalysts from the slurry oil. In addition, catalytically cracked gas oil (LCO (light cycle oil)) refers to a product obtained as a middle distillate when heavy oil is catalytically cracked in a fluid catalytic cracking unit or a residual oil fluid catalytic cracking unit, and having a boiling point range of 170°C to 390°C in atmospheric distillation. The fluid catalytic cracking unit or residual oil fluid catalytic cracking unit is not particularly limited, and known units can be used.

[0043] In the heavy oil composition according to the present invention, the catalytically cracked gas oil preferably has a boiling point range of 175°C to 380°C, more preferably 180°C to 370°C, in atmospheric distillation.

[0044] In the heavy oil composition according to the present invention, the one or more components obtained from catalytically cracked residual oil and catalytically cracked gas oil preferably have a CCAI of 860-965, more preferably 860-940, and even more preferably 860-920. By ensuring that one or more CCAIs obtained from catalytically cracked residual oil and catalytically cracked gas oil are within the above ranges, the heavy oil composition will contain desired amounts of aromatic components, etc., making it possible to suppress the amount of potential sediment and easily prevent a decrease in ignition ability.

[0045] In the heavy oil composition according to the present invention, the sulfur content of one or more components obtained from catalytic cracking residual oil and catalytic cracking light oil is preferably 0.05% by mass to 1.20% by mass, more preferably 0.07% by mass to 1.10% by mass, and even more preferably 0.09% by mass to 1.00% by mass. In the heavy oil composition of the present invention, since the content ratio of one or more sulfur components obtained from catalytic cracking residual oil and catalytic cracking light oil is within the above range, the sulfur content in the heavy oil composition can be easily adjusted to 0.50 mass% or less.

[0046] In the heavy oil composition of the present invention, the content of one or more nitrogen components obtained from catalytic cracking residual oil and catalytic cracking light oil is preferably 0.20 mass% or less, more preferably 0.19 mass% or less, and even more preferably 0.18 mass% or less. By ensuring that the content ratio of one or more nitrogen components obtained from catalytic cracking residual oil and catalytic cracking gas oil is within the above range, the nitrogen content of the heavy oil composition can be easily adjusted.

[0047] In the heavy oil composition according to the present invention, at least one of the catalytically cracked residual oil and the catalytically cracked light oil has a density of 0.8800 g / cm at 15°C. 3 ~1.1200g / cm 3 Preferably, it is 0.88500 g / cm 3 ~1.0900g / cm 3 More preferably, it is 0.9000 g / cm 3 ~1.0500g / cm 3 It is more preferable that: By having the density at 15°C of one or more of the catalytic cracking residual oil and catalytic cracking light oil within the above range, sediment generation in the heavy oil composition of the present invention can be efficiently suppressed and a decrease in ignition ability can be suppressed.

[0048] In the heavy oil composition according to the present invention, at least one of the catalytically cracked residual oil and the catalytically cracked light oil has a kinematic viscosity at 50°C of 1.30 mm 2 / s~150.00mm 2 / s is preferred, and 1.35 mm 2 / s~120.00mm 2 / s is more preferable, and 1.40 mm 2 / s~90.00mm 2 / s is even more preferred. When the kinematic viscosity at 50°C of one or more of the heavy oil compositions obtained from catalytic cracking residual oil and catalytic cracking light oil is within the above range, the heavy oil composition prepared using directly desulfurized heavy oil and one or more selected from catalytic cracking residual oil and catalytic cracking light oil can be stably supplied to industrial furnaces, boilers, etc., and when used in an internal combustion engine, the atomization state is good, making it possible to suppress uneven combustion and misfires.

[0049] In the heavy oil composition according to the present invention, the one or more types obtained from catalytic cracking residual oil and catalytic cracking light oil preferably have an actual sediment amount of 0.10 mass% or less (0.00 mass% to 0.10 mass%), more preferably 0.06 mass% or less (0.00 mass% to 0.06 mass%), and even more preferably 0.03 mass% or less (0.00 mass% to 0.03 mass%). In the heavy oil composition according to the present invention, the amount of one or more types of actual sediment obtained from catalytically cracked residual oil and catalytically cracked gas oil falls within the above range, so that the generation of sediment can be effectively suppressed.

[0050] In the heavy oil composition according to the present invention, the one or more components obtained from catalytic cracking residual oil and catalytic cracking light oil preferably have a potential sediment amount of 0.10 mass% or less (0.00 mass% to 0.10 mass%), more preferably 0.06 mass% or less (0.00 mass% to 0.06 mass%), and even more preferably 0.03 mass% or less (0.00 mass% to 0.03 mass%). In the heavy oil composition of the present invention, the amount of one or more potential sediments obtained from catalytic cracking residual oil and catalytic cracking gas oil falls within the above range, so that the generation of sediment during storage can be effectively suppressed.

[0051] The heavy oil composition of the present invention contains one or more species obtained from catalytic cracking residual oil and catalytic cracking light oil in a total amount of 30% to 65% by volume, preferably 35% to 65% by volume, and more preferably 40% to 65% by volume.

[0052] The heavy oil composition of the present invention contains a predetermined amount of directly desulfurized heavy oil, as well as predetermined amounts of one or more components obtained from catalytic cracking residual oil and catalytic cracking light oil, and the sulfur content, kinematic viscosity at 50°C, CCAI, latent sediment, and the sediment increase due to 48 hours of aging calculated by ``sediment amount after 48 hours aging at 100°C - latent sediment amount'' are controlled to predetermined values.This makes it possible to provide a heavy oil composition that has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both alone and after mixing with other heavy oil compositions.

[0053] The heavy oil composition according to the present invention may contain other base stocks as long as the effects of the present invention are not impaired. Examples of such base stocks include gas oil fractions other than catalytically cracked gas oil.

[0054] In this application, "diesel fractions excluding catalytically cracked diesel" refers to those having a boiling point range of about 170 to 600°C (excluding catalytically cracked diesel) that can be commonly used as base stocks for diesel and heavy oil A, and for cutback of vacuum distillation residue, and examples thereof include one or more selected from straight-run diesel, vacuum diesel, directly desulfurized light diesel, directly desulfurized heavy diesel, hydrodesulfurized diesel, indirectly desulfurized vacuum diesel, thermally cracked diesel, desulfurized vacuum diesel, etc. In this application, the diesel fraction may be a mixture of two or more diesel base stocks having predetermined physical properties. In this application, the term "cutback" refers to mixing a light base stock with residual oil for the purposes of reducing the kinematic viscosity, reducing the sulfur content, and the like.

[0055] The heavy oil composition according to the present invention may contain various additives as required. Examples of additives include known fuel additives such as flow improvers, pour point depressants, antioxidants, sludge dispersants, emulsion inhibitors, combustion promoters, and corrosion inhibitors. The additives may be used alone or in combination of two or more.

[0056] The heavy oil composition according to the present invention has a sulfur content of 0.50% by mass or less, preferably 0.47% by mass or less, and more preferably 0.45% by mass or less.

[0057] In the heavy oil composition of the present invention, the sulfur content can be easily controlled to 0.50 mass% or less by using one or more base materials obtained from directly desulfurized heavy oil, catalytic cracking residual oil, and catalytic cracking light oil, each of which has a sulfur content controlled within a desired range.

[0058] The heavy oil composition according to the present invention preferably has a nitrogen content of 0.13 mass % or less, more preferably 0.12 mass % or less, and even more preferably 0.11 mass % or less.

[0059] The heavy oil composition of the present invention can easily control the nitrogen content within a desired range by using one or more of the base materials obtained from directly desulfurized heavy oil, catalytic cracking residual oil, and catalytic cracking light oil, each of which has a nitrogen content controlled within a desired range.

[0060] The heavy oil composition according to the present invention has a kinematic viscosity at 50°C of 20.00 mm 2 / sec or more, 20.00mm 2 / sec~150.00mm 2 / sec is preferably 20.00 mm 2 / sec~120.00mm 2 / sec is more preferable. The heavy oil composition of the present invention, having a kinematic viscosity within the above range, can be stably supplied to industrial furnaces, boilers, ships, etc., and when used in the internal combustion engines of ships, etc., the atomization state is good, making it possible to effectively suppress uneven combustion and misfires.

[0061] In the heavy oil composition of the present invention, the kinematic viscosity can be easily controlled to a desired value by appropriately selecting one or more of the base materials obtained from directly desulfurized heavy oil, catalytic cracking residual oil, and catalytic cracking light oil.

[0062] The heavy oil composition according to the present invention has a CCAI of 870 or less, preferably 810-866, and more preferably 830-861. The heavy oil composition according to the present invention has a CCAI of 870 or less, and therefore can easily exhibit excellent ignition properties.

[0063] In the heavy oil composition of the present invention, the CCAI can be easily controlled to a desired value by appropriately selecting one or more of the base materials obtained from directly desulfurized heavy oil, catalytic cracking residual oil, and catalytic cracking light oil.

[0064] The heavy oil composition according to the present invention has a latent sediment amount of 0.10 mass % or less (0.00 to 0.10 mass %), preferably 0.00 to 0.06 mass %, and more preferably 0.00 to 0.03 mass %. The heavy oil composition according to the present invention can exhibit good storage stability by itself because the latent sediment amount is 0.10 mass % or less.

[0065] In the heavy oil composition of the present invention, by containing a predetermined amount of directly desulfurized heavy oil and a predetermined amount of one or more compounds obtained from catalytic cracking residual oil and catalytic cracking light oil, the amount of potential sediment can be easily controlled to a desired value.

[0066] The heavy oil composition of the present invention has an increase in sedimentation due to 48 hours of aging, calculated by "amount of sediment after 48 hours aging at 100°C - potential amount of sedimentation", of 0.02 mass% or less (0.00 to 0.02 mass%), preferably 0.01 mass% or less (0.00 to 0.01 mass%), and more preferably no increase.

[0067] As described above, even if a heavy oil composition having a potential sediment amount of 0.10 mass% or less was previously considered to have excellent storage stability when stored alone, when it was mixed with other heavy oil compositions, the resulting mixed fuel oil did not necessarily exhibit excellent storage stability. However, the heavy oil composition of the present invention not only exhibits excellent storage stability on its own, but also easily exhibits excellent storage stability when mixed with other heavy oil compositions, because the sediment increase due to 48 hours of aging, calculated by "sediment amount after 48 hours aging at 100°C - potential sediment amount", is 0.02 mass% or less.

[0068] The heavy oil composition according to the present invention has a density of 0.9200 g / cm at 15°C. 3 ~0.9910g / cm 3 Preferably, it is 0.9250 g / cm 3 ~0.9870g / cm 3 More preferably, it is 0.9300 g / cm 3 ~0.9830g / cm 3 It is more preferable that:

[0069] The heavy oil composition according to the present invention preferably has an actual sediment amount of 0.05% by mass or less (0.00% by mass to 0.05% by mass), more preferably 0.04% by mass or less (0.00% by mass to 0.04% by mass), and even more preferably 0.03% by mass or less (0.00% by mass to 0.03% by mass).

[0070] The heavy oil composition of the present invention contains a predetermined amount of directly desulfurized heavy oil, as well as predetermined amounts of one or more components obtained from catalytic cracking residual oil and catalytic cracking light oil, and the sulfur content, kinematic viscosity at 50°C, CCAI, potential sediment amount, and the sediment increase due to 48 hours of aging, calculated by subtracting the potential sediment amount from the sulfur content after 48 hours of aging at 100°C, are controlled to predetermined values. This makes it possible to provide a heavy oil composition that has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both on its own and after mixing with other heavy oil compositions.

[0071] The method for preparing the heavy oil composition of the present invention includes mixing 35% by volume to 70% by volume of directly desulfurized heavy oil and 30% by volume to 65% by volume of one or more types obtained from catalytic cracking residual oil and catalytic cracking light oil, Sulfur content of 0.50% by mass or less, Kinematic viscosity at 50°C is 20.00mm 2 / seconds or more, CCAI is 870 or less, The potential sediment content is 0.10% by mass or less; The sediment increase due to 48 hours of aging, calculated by subtracting the potential sediment amount from the sediment amount after 48 hours of aging at 100°C, is 0.02% by mass or less. The method for obtaining a heavy oil composition can be mentioned.

[0072] Details of the directly desulfurized heavy oil, catalytically cracked residual oil and catalytically cracked light oil, as well as the preferred ranges of the blending ratios of these base materials, are as described above.

[0073] In the present invention, the desired heavy oil composition can be easily prepared by mixing the above-mentioned directly desulfurized heavy oil with one or more selected from catalytic cracking residual oil and catalytic cracking light oil by any method so as to obtain the desired properties.

[0074] The heavy oil composition according to the present invention may be a C heavy oil composition, and such a C heavy oil composition can be suitably used as, for example, a marine fuel.

[0075] Next, a heavy oil composition suitable for mixing with the heavy oil composition of the present invention will be described. After being produced, the heavy oil composition according to the present invention is usually mixed with other heavy oil compositions and stored in a tank such as a shipping tank, a tank at a secondary base after shipping, or a tank on a ship. The heavy oil composition suitable for mixing with the heavy oil composition of the present invention is a heavy oil composition containing directly desulfurized heavy oil as a main base material and having a kinematic viscosity of 20.00 mm at 50 ° C. 2 / sec or more, CCAI of 870 or less, and potential sediment amount of 0.10 mass% or less (hereinafter referred to as "oil to be mixed"), and more specifically, C heavy oil having the above properties can be mentioned.

[0076] The oil to be blended contains direct desulfurized heavy oil as the main base material. In the present application, containing directly desulfurized heavy oil as the main base material means containing 35% by volume to 70% by volume of directly desulfurized heavy oil. The oil to be mixed preferably contains 40% to 70% by volume, and more preferably 40% to 65% by volume, of directly desulfurized heavy oil.

[0077] The oil to be blended preferably has a sulfur content of 0.50% by mass or less, more preferably 0.47% by mass or less, and even more preferably 0.45% by mass or less.

[0078] The oil to be mixed preferably has a nitrogen content of 0.13 mass % or less, more preferably 0.12 mass % or less, and even more preferably 0.11 mass % or less.

[0079] The above oil to be mixed has a kinematic viscosity of 20.00mm at 50°C. 2 / sec or more is preferable, and 20.00 mm 2 / sec~110.00mm 2 / sec is more preferable, and 20.00 mm 2 / sec~90.00mm 2 / sec is even more preferable.

[0080] The oil to be mixed preferably has a CCAI of 870 or less, more preferably 800-859, and even more preferably 800-858.

[0081] The oil to be mixed preferably has a latent sediment amount of 0.10% by mass or less (0.00 to 0.10% by mass), more preferably 0.00 to 0.05% by mass, and even more preferably 0.00 to 0.02% by mass.

[0082] The density of the above oil to be mixed at 15°C is 0.9200 g / cm 3 ~0.9910g / cm 3 Preferably, it is 0.9250 g / cm 3 ~0.9870g / cm 3 More preferably, it is 0.9300 g / cm 3 ~0.9830g / cm 3 It is more preferable that:

[0083] The oil to be mixed preferably has an actual sediment amount of 0.05% by mass or less (0.00% by mass to 0.05% by mass), more preferably 0.04% by mass or less (0.00% by mass to 0.04% by mass), and even more preferably 0.03% by mass or less (0.00% by mass to 0.03% by mass).

[0084] The oil to be mixed may be a mixture of two or more types of C heavy oil. As described above, after being produced, the heavy oil composition according to the present invention is usually mixed with other heavy oil compositions and stored in tanks such as shipping tanks, tanks at secondary bases after shipping, and tanks on ships. In this case, it is conceivable that two or more heavy oil compositions may be mixed and stored in the tank as oil to be mixed prior to storing the heavy oil composition of the present invention, or that after storing the heavy oil composition of the present invention in the tank, two or more heavy oil compositions may be further stored in the tank as oil to be mixed. Even after being mixed with other heavy oil compositions in this way, the heavy oil composition of the present invention can exhibit good storage stability.

[0085] When the heavy oil composition of the present invention is mixed with the oil to be mixed in a tank or the like, it is preferable to mix so that the content of the heavy oil composition of the present invention is 20 to 80% by volume, more preferably 30 to 70% by volume, and even more preferably 40 to 60% by volume.

[0086] By mixing the heavy oil composition of the present invention with the oil to be mixed in the above-mentioned mixing ratio, good storage stability can be easily exhibited even after mixing.

[0087] According to the present invention, it is possible to provide a heavy oil composition that has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both on its own and after mixing with other heavy oil compositions.

[0088] Next, the method for storing a heavy oil composition according to the present invention will be described. The storage method of the present invention comprises the steps of: It contains direct desulfurized heavy oil as the main base material and has a kinematic viscosity of 20.00 mm at 50°C. 2 / sec or more, CCAI of 870 or less, and potential sediment amount of 0.10 mass% or less, The heavy oil composition described in (1) above is mixed and stored in a state where the content is 20 to 80% by volume. It is characterized by the following.

[0089] Details of the heavy oil composition according to the present invention and the heavy oil composition to be mixed (oil to be mixed) containing directly desulfurized heavy oil as a main base material are as described above. When the heavy oil composition of the present invention is mixed with the oil to be mixed in a tank or the like, the content (mixing ratio) of the heavy oil composition of the present invention is 20 to 80% by volume, preferably 30 to 70% by volume, and more preferably 40 to 60% by volume. In the storage method of the present invention, the heavy oil composition of the present invention can be a C heavy oil composition, and the heavy oil composition (oil to be blended) containing directly desulfurized heavy oil as the main base material can also be a C heavy oil.

[0090] A specific embodiment of the storage method according to the present invention is one in which the heavy oil composition according to the present invention is produced, then mixed with a heavy oil composition containing directly desulfurized heavy oil as the main base material, and stored in a tank such as a shipping tank, a tank at a secondary base after shipping, or a tank on a ship.

[0091] According to the storage method of the present invention, by mixing the heavy oil composition of the present invention with a heavy oil composition containing directly desulfurized heavy oil as the main base material in a specific ratio, it is possible to easily exhibit good storage stability even after mixing. [Example]

[0092] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0093] (Examples 1 to 4 and Comparative Examples 1 to 6) Directly desulfurized heavy oil 1 to directly desulfurized heavy oil 4, catalytic cracking residual oil 1 to catalytic cracking residual oil 2, and catalytic cracking light oil 1 to catalytic cracking light oil 2, each having the properties shown in Table 1 (sulfur content, density at 15°C, kinematic viscosity at 50°C, CCAI, actual sediment amount, potential sediment amount, sediment amount after 48 hours aging at 100°C (48h sediment amount)), were blended in the proportions shown in Tables 2 and 3, respectively, to prepare heavy oils 1 to 4 according to Examples 1 to 4 and comparative heavy oils 1 to 6 according to Comparative Examples 1 to 6. The properties of each obtained heavy oil composition (sulfur content, density at 15°C, kinematic viscosity at 50°C, CCAI, actual sediment amount, potential sediment amount, sediment amount after aging at 100°C for 48 hours (48h sediment amount)) were measured. Furthermore, based on the above measurement results, the sediment increase due to 48 hours of aging (48-hour sediment increase) was calculated by "48-hour sediment amount - potential sediment amount". The results are shown in Tables 2 and 3.

[0094] [Table 1]

[0095] [Table 2]

[0096] [Table 3]

[0097] Next, heavy oils 1 to 4 obtained in Examples 1 to 4 and comparative heavy oils 3 to 6 obtained in Comparative Examples 3 to 6, respectively, were mixed in the mixing ratios shown in Table 4, and the actual sediment amount and potential sediment amount in the resulting mixed oil were measured. In addition, based on the measurement results obtained, the sediment increase amount (24-hour sediment increase amount) calculated by "potential sediment amount - actual sediment amount" was calculated, and storage stability was evaluated according to the following evaluation criteria. <Evaluation criteria for storage stability> 〇: Sediment increase over 24 hours is less than 0.02% by mass ×: Sediment increase over 24 hours is 0.02% by mass or more The results are shown in Table 4.

[0098] [Table 4]

[0099] From Table 2, it can be seen that the heavy oils 1 to 4 obtained in Examples 1 to 4 contain 35% by volume to 70% by volume of directly desulfurized heavy oil, and 30% by volume to 75% by volume of one or more of catalytic cracking residual oil and catalytic cracking light oil, and have a sulfur content of 0.50% by mass or less and a kinematic viscosity at 50°C of 20.00 mm 2 / sec or more, CCAI of 870 or less, and potential sediment amount of 0.10 mass% or less, the sulfur content is reduced, the fluidity and ignition are excellent, and the oil can exhibit good storage stability on its own. Furthermore, from Tables 2 and 4, it can be seen that the heavy oils 1 to 4 obtained in Examples 1 to 4 had sediment increase amounts of 0.02 mass% or less after 48 hours of aging, calculated as "amount of sediment after 48 hours of aging at 100°C - potential amount of sediment", and therefore even when heavy oils 1 to 4 were mixed with other heavy oils, the storage stability evaluation based on the amount of sediment increase of the resulting mixed oils was rated "Good", indicating excellent storage stability.

[0100] On the other hand, Table 3 shows that comparative heavy oils 1 and 2 obtained in comparative examples 1 and 2 have poor ignition and fluidity because their CCAI exceeds the specified value (comparative example 1) and their kinematic viscosity at 50°C is less than the specified value (comparative example 2). Furthermore, from Tables 3 and 4, it can be seen that the comparative heavy oils 3 to 6 obtained in Comparative Examples 3 to 6 all have low potential sediment amounts and exhibit good storage stability on their own, but since the sediment increase due to 48 hours of aging calculated by "sediment amount after 48 hours aging at 100°C - potential sediment amount" exceeds a specified value, when mixed with other heavy oils, the storage stability evaluation based on the sediment increase amount of the resulting mixed oil is rated "X", indicating that the storage stability is poor. [Industrial Applicability]

[0101] According to the present invention, a heavy oil composition is provided which has an appropriately reduced sulfur content, is excellent in fluidity and ignition properties, and exhibits good storage stability both alone and after mixing with other heavy oil compositions, and a method for storing the heavy oil composition is also provided.

Claims

1. A mixture comprising 35% to 60% by volume of directly desulfurized heavy oil, 40 to 65% by volume of catalytic cracking residual oil, 0 to 20% by volume of catalytic cracking light oil, and a total of 40 to 65% by volume of one or more components derived from catalytic cracking residual oil and catalytic cracking light oil, Sulfur content is 0.50% by mass or less, A kinematic viscosity at 50°C of 20.00 mm 2 / sec or more, CCAI is 870 or less, The potential sediment amount is 0.10% by mass or less, A first heavy oil composition in which the sediment increase amount due to 48 hours of aging, calculated by subtracting the potential sediment amount from the sediment amount after 48 hours of aging at 100°C, is 0.02 mass% or less; It contains directly desulfurized heavy oil as the main base material and has a kinematic viscosity of 20.00 mm at 50 ° C. ２ / sec or more, a CCAI of 870 or less, and a potential sediment amount of 0.10 mass% or less; The first heavy oil composition is mixed and stored in a state where the content of the first heavy oil composition is 20 to 80% by volume. A method for storing a heavy oil composition, comprising:

2. A mixture comprising 35% to 60% by volume of directly desulfurized heavy oil, 40 to 65% by volume of catalytic cracking residual oil, 0 to 20% by volume of catalytic cracking light oil, and a total of 40 to 65% by volume of one or more compounds obtained from catalytic cracking residual oil and catalytic cracking light oil, Sulfur content is 0.50% by mass or less, A kinematic viscosity at 50°C of 20.00 mm 2 / sec or more, CCAI is 870 or less, The potential sediment amount is 0.10% by mass or less, A first heavy oil composition in which the sediment increase amount due to 48 hours of aging, calculated by subtracting the potential sediment amount from the sediment amount after 48 hours of aging at 100°C, is 0.02 mass% or less; a second heavy oil composition containing directly desulfurized heavy oil as a main base material, having a kinematic viscosity at 50°C of 20.00 mm 2 / s or more, a CCAI of 870 or less, and a latent sediment amount of 0.10 mass% or less; The first heavy oil composition is mixed so that the content of the first heavy oil composition is 20 to 80% by volume. A method for producing a heavy oil composition comprising the steps of:

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