Spontaneous heat generation inhibitor for carbon resources, method for producing a spontaneous heat generation inhibitor for carbon resources, method for inhibiting spontaneous heat generation for carbon resources, and method for storing carbon resources

Abstract

The present invention provides a spontaneous heat generation inhibitor for a second carbon resource, which is a component contained in a first carbon resource or a dry distillation product of the first carbon resource, and is soluble in hexane or insoluble in hexane and soluble in toluene. The present invention also provides a method for producing a spontaneous heat generation inhibitor for a second carbon resource, which includes a first step of extracting the first carbon resource or the dry distillation product of the first carbon resource with hexane. The present invention also provides a method for suppressing spontaneous heat generation in a second carbon resource and a method for storing a second carbon resource.

Description

[Technical Field]

[0001] The present disclosure relates to a spontaneous heat generation inhibitor for carbon resources, a method for producing a spontaneous heat generation inhibitor for carbon resources, a method for suppressing spontaneous heat generation for carbon resources, and a method for storing carbon resources. This application claims priority based on Japanese Patent Application No. 2024-040975, filed on March 15, 2024, the contents of which are incorporated herein by reference. [Background technology]

[0002] For example, the steel industry uses large amounts of carbon resources. Here, carbon resources are resources containing carbon atoms. Carbon resources are, for example, resources that obtain heat by burning carbon atoms or that are used as reducing agents. Carbon resources include, for example, petroleum, coal, and biomass carbonaceous materials. Biomass carbonaceous materials are carbonaceous materials obtained by dry distilling biomass.

[0003] Depending on the type of carbon resource, spontaneous heating of the carbon resource may become a problem. For example, coal and woody biomass charcoal are prone to spontaneous heating. Therefore, when storing large quantities of these materials, careful temperature control is required.

[0004] Patent Documents 1 to 3 disclose techniques for suppressing spontaneous combustion of carbon resources. Patent Document 4 discloses suppressing spontaneous combustion of coal by coating the coal with components extracted from the coal with a non-hydrogen donor solvent. An example is disclosed in which coal is mixed with methylnaphthalene and subjected to extraction treatment using an autoclave at a temperature of 360°C and a pressure of 2 MPa. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-164254 [Patent Document 2] Japanese Patent Application Publication No. 2011-201947 [Patent Document 3] Japanese Patent Publication No. 59-074189 [Patent Document 4] Japanese Patent Publication No. 2007-161926 Summary of the Invention [Problem to be solved by the invention]

[0006] The present inventors considered that the techniques disclosed in Patent Documents 1 to 4 are unable to sufficiently suppress spontaneous heating of carbon resources and are also disadvantageous in terms of cost. For example, Patent Document 4 is a technique in which extraction treatment is performed in a limited environment, that is, in an autoclave, which is disadvantageous in terms of cost. It is also known that pitches (for example, by-products obtained during coal carbonization) can suppress spontaneous heating of carbon resources. For example, mixing pitches with carbon resources can suppress spontaneous heating of carbon resources. This is thought to be because pitches cover the particles of the carbon resource, preventing contact between the carbon resource and oxygen gas, and furthermore, the donation of hydrogen atoms from pitches to the carbon resource suppresses radical reactions. However, the production of pitches is costly, and there is also the problem of generating a large amount of CO2 gas during the production of pitches.

[0007] The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a spontaneous heat generation inhibitor for carbon resources that can be produced at low cost and is effective in small amounts. [Means for solving the problem]

[0008] The gist of this disclosure is as follows. (1) Contains one or more selected from petroleum, coal, and biomass carbonaceous materials A spontaneous heat generation inhibitor for a second carbon resource, which is a component contained in a first carbon resource or a dry distillation product of the first carbon resource, and is insoluble in hexane and soluble in toluene. (2) Contains one or more selected from petroleum, coal, and biomass carbonaceous materialsExtracting the first carbon resource or the dry distillation product of the first carbon resource with hexane. To obtain the hexane-insoluble components A first step and the first step Hexane-insoluble components obtained in Extracted with toluene Toluene-soluble components are obtained by Including the second step and by the second step, a spontaneous heat generation inhibitor for a second carbon resource that is insoluble in hexane and soluble in toluene is obtained. A method for producing a spontaneous heat generation inhibitor for a second carbon resource, comprising: ( 3 ) (1) to A method for suppressing spontaneous heat generation of a second carbon resource, comprising the step of adding the spontaneous heat generation inhibitor for a second carbon resource described above in an amount of 1 mass % or more to the second carbon resource. ( 4 ) ( 3 10. A method for storing a second carbon resource, comprising storing a mixture obtained by the method for suppressing spontaneous heat generation of a second carbon resource described in 1. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a spontaneous heat generation inhibitor for carbon resources that can be produced at low cost and is effective in small amounts. Furthermore, according to the present disclosure, it is possible to provide a method for producing a spontaneous heat generation inhibitor for carbon resources that can be produced at low cost and is effective in small amounts. Furthermore, according to the present disclosure, it is possible to provide a method for suppressing spontaneous heat generation of carbon resources and a method for storing carbon resources that use a spontaneous heat generation inhibitor for carbon resources that is low cost and is effective in small amounts. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a graph according to Example 1 showing the relationship between the elapsed time from the start of the spontaneous heating evaluation test and the sample temperature. [Figure 2] 10 is a graph showing the relationship between the elapsed time from the start of the spontaneous heating evaluation test and the sample temperature according to Example 2. [Figure 3] 10 is a graph according to Example 3 showing the relationship between the elapsed time from the start of the spontaneous heating evaluation test and the sample temperature. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It is to be understood that the present disclosure is not limited to the examples described below. In the following description, specific numerical values ​​and materials may be used as examples, but other numerical values ​​and materials may be applied as long as the effects of the present invention are obtained. Furthermore, the components of the following embodiments can be combined with each other. Furthermore, in this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits. In this specification, the term "process" includes not only an independent process, but also a process that cannot be clearly distinguished from other processes as long as the intended purpose of the process is achieved.

[0012] <1. Findings of the Inventor> The present inventors have discovered that petroleum-based binders (although binders may also be called binders depending on the application) used as binders for low-quality coals are effective in suppressing spontaneous heating of carbon resources. Spontaneous heating refers to heat generated in air at room temperature and atmospheric pressure. Petroleum-based binders are mixtures obtained by distilling and refining petroleum. The present inventors then fractionated the petroleum-based binders using solvent extraction, and added each fraction to the carbon resource. As a result, they found that there are fractions that have a greater effect on suppressing spontaneous heating than adding the petroleum-based binder itself, even at the same addition rate. In addition, since petroleum-based binders are obtained by distilling and refining petroleum, similar effects can be expected even if petroleum-like carbonaceous materials, i.e., carbon resources or carbon distillation products of carbon resources, are fractionated by solvent extraction. This embodiment has been made based on the above findings.

[0013] <2. Method for producing spontaneous heat suppressant from second carbon resource> A method for producing a spontaneous heat generation inhibitor for a carbon resource will be described. In this specification, a carbon resource used as a raw material for the spontaneous heat generation inhibitor will be referred to as a first carbon resource, and a carbon resource for which spontaneous heat generation is to be inhibited will be referred to as a second carbon resource (or simply as a carbon resource). The first carbon resource and the second carbon resource may be different or the same.

[0014] First, a raw material is prepared. Here, the raw material is a first carbon resource or a dry distillation product of the first carbon resource. The first carbon resource is a resource containing carbon atoms, and heat is obtained by burning the carbon atoms. The first carbon resource is, for example, petroleum, coal, or biomass carbonaceous material. The pyrolysis product of the first carbon resource is, for example, a carbonaceous material obtained by pyrolyzing coal or biomass carbonaceous material, more specifically, coal tar. The pyrolysis product of the first carbon resource is, for example, a pyrolysis product (ASP) obtained from petroleum as a raw material.

[0015] The components contained in the carbon resource dry distillation products are substances listed on pages 479 to 526 of the Aromatic and Tar Industry Handbook, Third Edition (Japan Aromatic Industry Association).

[0016] Next, the first carbon resource or the dry distillation product of the first carbon resource is extracted with hexane (first step). Specifically, for example, the first carbon resource or the dry distillation product of the first carbon resource is thoroughly mixed with hexane and allowed to stand. Next, the liquid portion is recovered, and the hexane is removed from the liquid portion. This yields a spontaneous heat generation inhibitor (HS) for the second carbon resource. As shown in the examples, the spontaneous heat generation inhibitor (HS) for the second carbon resource has a sufficient spontaneous heat generation inhibitory effect.

[0017] More specifically, the first step is carried out in the following manner. 1. Place 2 g of the first carbon source in a centrifuge tube. Add 50cc of hexane to the centrifuge tube in 2.1 and apply ultrasonic vibration for 10 minutes. The centrifuge tube from 3.2 is centrifuged to separate the solid from the liquid. The supernatant obtained in step 4.3 is collected and filtered using filter paper to obtain the extract (hexane-soluble components). Repeat steps 2 to 4 twice on the extraction residue in the centrifuge tube after step 5.4 (for a total of three times). 6. The extract obtained in steps 1 to 5 above is evaporated to remove the solvent (hexane). The extract (hexane-soluble components) and extraction residue (hexane-insoluble components) recovered in step 7.6, and the extraction residue (hexane-insoluble components) on the filter paper recovered in steps 1 to 5 are placed in a vacuum dryer and left to stand at 80°C for 12 hours to remove the solvent contained in the extraction residue, and the hexane-soluble components and hexane-insoluble components are obtained.

[0018] The method for producing a spontaneous heat generation inhibitor for a second carbon resource may be completed when the spontaneous heat generation inhibitor for a second carbon resource (HS) is obtained, but the following second step may be further carried out. That is, the insoluble residue from the first step is extracted with toluene (second step). For example, the insoluble residue from the first step is thoroughly mixed with toluene and allowed to stand. Next, the liquid portion is recovered and the toluene is removed from the liquid portion. This yields a spontaneous heat generation inhibitor (HI-TS) for the second carbon resource. As shown in the examples, the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource has a sufficient spontaneous heat generation inhibitory effect.

[0019] More specifically, the second step is carried out in the following manner. 8. Repeat steps 1 to 7 multiple times to obtain 2 g or more of the hexane-insoluble component, and collect 2 g of the hexane-insoluble component and place it in a centrifuge tube. Add 50 cc of toluene to the centrifuge tube in 9.8 and apply ultrasonic vibration for 10 minutes. 10.9 The centrifuge tube is placed in a centrifuge to separate the solid and liquid. 11. The supernatant obtained in step 10 is collected and filtered to obtain the extract (toluene-soluble components). 12. Repeat steps 9 to 11 twice for the extraction residue in the centrifuge tube after step 11 (for a total of three times). 13. The extract obtained in steps 12 above is evaporated to remove the solvent (toluene). The extract (toluene-soluble components) and extraction residue (toluene-insoluble components) recovered in steps 14.13 and the extraction residue (toluene-insoluble components) on the filter paper recovered in steps 11 through 12 are placed in a vacuum dryer and left to stand at 80°C for 12 hours to remove the solvent contained in the extraction residue, yielding the hexane-insoluble / toluene-soluble components and toluene-insoluble components.

[0020] The first step may include a step of mixing the first carbon resource with hexane (corresponding to steps 1 and 2 above), a step of solid-liquid separation of the mixture of the first carbon resource with hexane (corresponding to step 3 above), and a step of filtration (corresponding to step 4 above), which are carried out in this order. Alternatively, the first step may include adding hexane again to the residue after the filtration step (corresponding to step 2 above), and further carrying out the solid-liquid separation step and the filtration step. Alternatively, the first step may be a first hexane removal step (corresponding to step 6 above) in which hexane is removed after the filtration step. Furthermore, the first step may be a second hexane removal step (corresponding to step 7 above) in which hexane is removed from the hexane-soluble component, which is the extracted component, and the hexane-insoluble component, which is the residue, after the first hexane removal step.

[0021] As in the first step, the second step may be performed in this order: a mixing step of the hexane-insoluble component and toluene (corresponding to steps 8 and 9 above), a solid-liquid separation step of the mixture of the hexane-insoluble component and toluene (corresponding to step 10 above), and a filtration step (corresponding to step 11 above). Alternatively, the second step may be performed by adding toluene again to the residue after the filtration step (corresponding to step 9 above), and then performing the solid-liquid separation step and the filtration step. As the second step, a first toluene removal step (corresponding to the above 13) for removing toluene may be carried out after the filtration step. Furthermore, as the second step, a second toluene removal step (corresponding to the above 14) for removing toluene from the toluene-soluble component as the extracted component and the toluene-insoluble component as the residue may be carried out after the first toluene removal step.

[0022] Although the above describes an example in which the second step is performed after the first step, the first step may also be performed after the second step. When the first step is performed after the second step, the first carbon resource in 1 above is replaced with the toluene-insoluble component, and the hexane-insoluble component in 8 above is replaced with the first carbon resource. The hexane-soluble component and the toluene-soluble component do not depend on the order of the extraction operation with toluene and the extraction operation with hexane.

[0023] <3. Secondary carbon resource spontaneous heat suppressant> Therefore, the spontaneous heat generation inhibitor for the second carbon resource according to this embodiment is a component contained in the first carbon resource or the dry distillation product of the first carbon resource, and is soluble in hexane or insoluble in hexane and soluble in toluene. The spontaneous heat generation inhibitor for the second carbon resource according to this embodiment is produced by solvent fractionation of the first carbon resource or the dry distillation product of the first carbon resource, and can be produced at low cost.

[0024] "Soluble" means that when a solvent is added to a compound, the solid or solid substance becomes liquid. Alternatively, "soluble" means that a liquid is mixed with another liquid compound to form a homogeneous liquid. Note that solubility is the maximum amount of solute that can be dissolved in a solvent at a given temperature. When the extraction operations of the first and second steps described above are performed on a spontaneous heat generation inhibitor, and a total of 1% by mass or more of components that are soluble in hexane and / or extracted components that are insoluble in hexane and soluble in toluene (excluding residues) are obtained, the spontaneous heat generation inhibitor corresponds to the spontaneous heat generation inhibitor of this embodiment.

[0025] For example, the coal coating agent disclosed in Patent Document 4 is produced at high temperatures, resulting in high costs. In contrast, the method for producing the second carbon resource spontaneous heat inhibitor according to this embodiment can be carried out at room temperature and atmospheric pressure, and therefore has the advantage of being low cost.

[0026] <4. Secondary carbon resource spontaneous heat suppression method> In the method for suppressing spontaneous heat generation of a second carbon resource according to this embodiment, the spontaneous heat generation inhibitor for the second carbon resource according to this embodiment is added in an amount of 1 mass % or more relative to the second carbon resource. Therefore, even a small amount of the spontaneous heat generation inhibitor for the second carbon resource is effective. As shown in the examples, a sufficient spontaneous heat generation suppression effect can be obtained by setting the mass ratio of the spontaneous heat generation inhibitor for the second carbon resource to 1 mass % or more. Furthermore, in order to uniformly add and knead the spontaneous heat generation inhibitor to the carbon resource, it is more preferable to add the spontaneous heat generation inhibitor for the second carbon resource in an amount of 3 mass % or more relative to the second carbon resource. The upper limit of the mass ratio is not particularly limited, but is, for example, 30 mass % or less. Alternatively, because the spontaneous heat generation inhibitor has high viscosity and therefore a high mass ratio results in poor handleability, the second spontaneous heat generation inhibitor may be added in an amount of less than 20 mass %, more preferably less than 10 mass %, relative to the second carbon resource.

[0027] <5. Second carbon resource storage method> The second carbon resource storage method according to this embodiment involves storing the mixture obtained by the second carbon resource spontaneous heat suppression method. The atmosphere during storage is not particularly limited, and the mixture may be stored in the air.

[0028] <6. Use as a spontaneous heat suppressant> The present disclosure also includes use of a spontaneous heat generation inhibitor for a second carbon resource, which is a component contained in a first carbon resource or a dry distillation product of the first carbon resource, and is characterized by being soluble in hexane or insoluble in hexane and soluble in toluene. The first carbon resource may include any one or more selected from petroleum, coal, and biomass carbonaceous materials. The spontaneous heat generation inhibitor for a second carbon resource may have the features of the above-described embodiment. Furthermore, the spontaneous heat generation inhibitor for a second carbon resource may be produced by the above-described production method. [Example]

[0029] Example 1 Next, an example of this embodiment will be described. In this example, acacia-derived woody biomass charcoal was prepared as a second carbon resource whose spontaneous heat generation is to be suppressed. Acacia-derived woody biomass charcoal has high spontaneous heat generation properties. Hereinafter, acacia-derived woody biomass charcoal will be abbreviated as acacia charcoal.

[0030] Meanwhile, a spontaneous heat generation inhibitor for a second carbon resource was prepared by the following steps. First, a dry distillation product (ASP) obtained from petroleum was prepared. Commercially available ASP was used. Next, 2 g of ASP was extracted with 50 cc of hexane (first step) using the procedure described in the above embodiment. The extraction was performed at a temperature of 25°C and atmospheric pressure. After that, the hexane was evaporated to obtain the residue, an additive (HS).

[0031] Next, in the second step, 2 g of the insoluble residue from the first step was extracted with 50 cc of toluene. The extraction was carried out at a temperature of 25°C and atmospheric pressure. This resulted in the production of an additive (HI-TS). The insoluble residue that was insoluble in toluene was designated as additive (TI).

[0032] Next, a spontaneous heating evaluation test was conducted. The following samples were prepared: 1.00 g of acacia carbonaceous material alone, 0.95 g of acacia carbonaceous material to which 5% by mass (50 mg) of ASP had been added, the same amount of acacia carbonaceous material to which 5% by mass (50 mg) of additive (HS), the same amount of acacia carbonaceous material to which 5% by mass (50 mg) of additive (HI-TS) had been added, and the same amount of acacia carbonaceous material to which 5% by mass (50 mg) of additive (TI) had been added.

[0033] Next, 1 g of these samples was taken and loaded into the sample cell of the spontaneous heating evaluation device. The sample cell was then placed in the sample holder chamber, and the atmosphere inside the device was replaced with nitrogen. The sample temperature was then raised to 130°C under the nitrogen atmosphere. The sample temperature was measured using a thermocouple. The atmosphere inside the device was then switched from nitrogen to air, and the test began, and the temperature behavior of the sample was measured. The results are shown in Figure 1.

[0034] The horizontal axis of Figure 1 shows the elapsed time (min) from the start of the spontaneous heating evaluation test, and the vertical axis shows the sample temperature. Graph L1 shows the test results for a sample consisting of only acacia carbonaceous material, graph L2 shows the test results for a sample consisting of acacia carbonaceous material with 5% by mass of ASP added, graph L3 shows the test results for a sample consisting of acacia carbonaceous material with 5% by mass of additive (HS), graph L4 shows the test results for a sample consisting of acacia carbonaceous material with 5% by mass of additive (HI-TS), and graph L5 shows the test results for a sample consisting of acacia carbonaceous material with 5% by mass of additive (TI).

[0035] As is clear from graphs L1 to L5 in Figure 1, when the spontaneous heat generation inhibitor (HS) for the second carbon resource according to the above embodiment, i.e., the additive (HS) or the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource, was added to the second carbon resource (acacia carbonaceous material), a significant spontaneous heat generation inhibitory effect was obtained and the reproducibility was high. In particular, a greater effect was obtained when the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource was added.

[0036] Example 2 In this example, a woody biomass carbonaceous material F other than acacia was prepared as a second carbon resource whose spontaneous heat generation was to be suppressed.

[0037] The same ASP as in Example 1 was prepared as a spontaneous heat generation inhibitor for the second carbon resource. Furthermore, as a spontaneous heat generation inhibitor for the second carbon resource, an additive (HS) was obtained from the ASP using the same procedure as in Example 1. Next, as spontaneous heat generation inhibitors for the second carbon resource, an additive (HI-TS) and an insoluble residue additive (TI) were obtained from the ASP using the same procedure as in Example 1.

[0038] Next, a spontaneous heating evaluation test was conducted. The following samples were prepared: 1.00 g of biomass carbonaceous material F alone, 0.95 g of biomass carbonaceous material F to which 5% by mass (50 mg) of ASP was added, the same amount of biomass carbonaceous material F to which 5% by mass (50 mg) of additive (HS), the same amount of biomass carbonaceous material F to which 5% by mass (50 mg) of additive (HI-TS) was added, and the same amount of biomass carbonaceous material F to which 5% by mass (50 mg) of additive (TI).

[0039] Next, as in Example 1, 1 g of each sample was collected and loaded into the sample cell of the spontaneous heating evaluation device. The sample cell was then placed in the sample holder chamber, and the atmosphere inside the device was replaced with nitrogen. The sample temperature was then raised to 130°C under the nitrogen atmosphere. The sample temperature was measured using a thermocouple. The atmosphere inside the device was then switched from nitrogen to air, and the test began, and the temperature behavior of the sample was measured. The results are shown in Figure 2.

[0040] The horizontal axis of Figure 2 represents the elapsed time (min) from the start of the spontaneous heating evaluation test, and the vertical axis represents the sample temperature. Graph L1 shows the test results for a sample consisting of only biomass carbonaceous material F, graph L2 shows the test results for a sample consisting of biomass carbonaceous material F with 5% by mass of ASP added, graph L3 shows the test results for a sample consisting of biomass carbonaceous material F with 5% by mass of an additive (HS) derived from ASP added, graph L4 shows the test results for a sample consisting of biomass carbonaceous material F with 5% by mass of an additive (HI-TS) derived from ASP added, and graph L5 shows the test results for a sample consisting of biomass carbonaceous material F with 5% by mass of an additive (TI) derived from ASP added.

[0041] As is clear from graphs L1 to L5 in Fig. 2, when the spontaneous heat generation inhibitor (HS) for the second carbon resource according to the above embodiment, i.e., the additive (HS) or the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource, was added to the second carbon resource (biomass carbonaceous material F), a significant spontaneous heat generation inhibitory effect was obtained and the reproducibility was high. In particular, a greater effect was obtained when the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource was added.

[0042] Example 3 In this example, a woody biomass charcoal material PC other than acacia was prepared as a second carbon resource for which spontaneous heat generation was to be suppressed.

[0043] A first carbon resource S, which was not ASP, was prepared as a spontaneous heat generation inhibitor for a second carbon resource. Furthermore, as a spontaneous heat generation inhibitor for a second carbon resource, an additive (HS) was obtained from the carbon resource S using the same procedure as in Example 1. Next, as spontaneous heat generation inhibitors for a second carbon resource, an additive (HI-TS) and an insoluble residue additive (TI) were obtained from the carbon resource S using the same procedure as in Example 1.

[0044] Next, a spontaneous heating evaluation test was conducted. The following samples were prepared: 1.00 g of biomass carbonaceous PC alone, 0.95 g of biomass carbonaceous PC with 5% by mass (50 mg) of additive (HS), the same amount of biomass carbonaceous PC with 5% by mass (50 mg) of additive (HI-TS), and the same amount of biomass carbonaceous PC with 5% by mass (50 mg) of additive (TI).

[0045] Next, as in Example 1, 1 g of each sample was taken and loaded into the sample cell of the spontaneous heating evaluation device. The sample cell was then placed in the sample holder chamber, and the atmosphere inside the device was replaced with nitrogen. The sample temperature was then raised to 130°C under the nitrogen atmosphere. The sample temperature was measured using a thermocouple. The atmosphere inside the device was then switched from nitrogen to air, and the test began, and the temperature behavior of the sample was measured. The results are shown in Figure 3.

[0046] The horizontal axis of Figure 3 represents the elapsed time (min) from the start of the spontaneous heating evaluation test, and the vertical axis represents the sample temperature. Graph L1 shows the test results when the sample consisted of only biomass carbonaceous material PC, graph L2 shows the test results when the sample consisted of biomass carbonaceous material PC with 5 mass% of an additive (HS) derived from carbon resource S added, graph L3 shows the test results when the sample consisted of biomass carbonaceous material PC with 5 mass% of an additive (HI-TS) derived from carbon resource S added, and graph L4 shows the test results when the sample consisted of biomass carbonaceous material PC with 5 mass% of an additive (TI) derived from carbon resource S added.

[0047] As is clear from graphs L1 to L4 in Fig. 3, it was found that a spontaneous heat generation inhibitor (HS) for the second carbon resource according to the above embodiment, i.e., the additive (HS) or the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource, was added to the second carbon resource (biomass carbonaceous material PC), and a particularly large effect was obtained when the spontaneous heat generation inhibitor (HI-TS) for the second carbon resource was added.

[0048] Example 4 Next, the time it took to reach 200°C was investigated when the type and amount of spontaneous heat inhibitor added to the second carbon resource were changed. The second carbon resource to be suppressed from spontaneous heating was the above-mentioned 10 g of acacia carbonaceous material, to which ASP, additive (HS), additive (HI-TS), and additive (TI) were added in amounts of 1, 3, or 5 mass%.

[0049] The spontaneous heating evaluation test described above was carried out on these samples. The time from the start of the test until the sample temperature reached 200°C (time to reach 200°C) was measured. The results are shown in Table 1. The values ​​in the table indicate the time (min) to reach 200°C. As shown in Table 1, the time to reach 200°C, which was not achieved without adding 5% by mass of ASP, can be achieved with just 1% by mass of additive (HS) or additive (HI-TS).

[0050] [Table 1]

[0051] Although the preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, the present disclosure is not limited to such examples. It is clear that a person skilled in the art to which the present disclosure pertains can conceive of various modifications or alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure. [Industrial Applicability]

[0052] According to the present disclosure, it is possible to provide a spontaneous heat generation inhibitor for carbon resources that can be produced at low cost and is effective in small amounts. Furthermore, according to the present disclosure, it is possible to provide a method for producing a spontaneous heat generation inhibitor for carbon resources that can be produced at low cost and is effective in small amounts. Furthermore, according to the present disclosure, it is possible to provide a method for suppressing spontaneous heat generation of carbon resources and a method for storing carbon resources that use a spontaneous heat generation inhibitor for carbon resources that is low cost and is effective in small amounts. Therefore, the invention according to the present disclosure is extremely useful industrially.

Claims

1. A component contained in a first carbon resource containing one or more selected from petroleum, coal, and biomass carbonaceous materials, or a dry distillation product of the first carbon resource, Insoluble in hexane and soluble in toluene, A spontaneous heat generation inhibitor for a second carbon resource, characterized by:

2. A first step of extracting a first carbon resource containing at least one selected from petroleum, coal, and biomass carbonaceous material or a dry distillation product of the first carbon resource with hexane to obtain a hexane-insoluble component; a second step of extracting the hexane-insoluble component obtained in the first step with toluene to obtain a toluene-soluble component; The second step produces a spontaneous heat generation inhibitor for a second carbon resource that is insoluble in hexane and soluble in toluene. A method for producing a spontaneous heat generation inhibitor for a second carbon resource, comprising:

3. The method includes adding the spontaneous heat generation inhibitor for a second carbon resource according to claim 1 in an amount of 1 mass% or more to the second carbon resource. A method for suppressing spontaneous heat generation of a second carbon resource, comprising:

4. Storing the mixture obtained by the second method for suppressing spontaneous heat generation of a carbon resource according to claim 3. A second method for storing carbon resources, comprising:

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