Spontaneous heat generation inhibitor for carbon resource, method for manufacturing spontaneous heat generation inhibitor for carbon resource, method for suppressing spontaneous heat generation in carbon resource, and method for storing carbon resource

Abstract

What is provided is a spontaneous heat generation inhibitor for a second carbon resource, in which the spontaneous heat generation inhibitor for a second carbon resource 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. In addition, what is provided is a method for manufacturing a spontaneous heat generation inhibitor for a second carbon resource, the method including a first step of extracting a first carbon resource or a dry distillation product of the first carbon resource with hexane. In addition, what is provided is a method for suppressing spontaneous heat generation in a second carbon resource and a method for storing the second carbon resource.

Description

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

[0001] The present disclosure relates to a spontaneous heat generation inhibitor for carbon resources, a method for manufacturing the spontaneous heat generation inhibitor for carbon resources, a method for suppressing spontaneous heat generation of 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.

[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.

[0005] Japanese Patent Publication No. 2001-164254 Japanese Patent Publication No. 2011-201947 Japanese Patent Publication No. 59-074189 Japanese Patent Publication No. 2007-161926

[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 describes a technique in which extraction processing is performed in a limited environment, namely, an autoclave, which is disadvantageous in terms of cost. Furthermore, it is known that pitches (for example, by-products obtained during coal carbonization) can suppress spontaneous heating of carbon resources. For example, kneading pitches with a carbon resource can suppress spontaneous heating of the carbon resource. 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, donation of hydrogen atoms from pitches to the carbon resource can suppress radical reactions. However, production of pitches is costly, and furthermore, a large amount of CO is generated during the production of pitches. ２ There is a problem of gas generation.

[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.

[0008] The gist of the present disclosure is as follows: (1) 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. (2) The spontaneous heat generation inhibitor for a second carbon resource according to (1), wherein the first carbon resource includes any one or more selected from petroleum, coal, and biomass carbonaceous materials. (3) 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 a dry distillation product of the first carbon resource with hexane. (4) A method for producing a spontaneous heat generation inhibitor for a second carbon resource according to (3), which includes a second step of extracting the insoluble residue from the first step with toluene. (5) A method for suppressing spontaneous heat generation for a second carbon resource, which includes a step of adding the spontaneous heat generation inhibitor for a second carbon resource according to (1) or (2) to the first carbon resource in an amount of 1 mass % or more. (6) 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 according to (5).

[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.

[0010] 1 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 1. FIG. 2 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. FIG. 3 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 3.

[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 inventor discovered that petroleum-based binders (also sometimes referred to as binders depending on the application) used as binders for low-quality coals are effective in suppressing spontaneous heating of carbonaceous 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 inventor then added each fraction obtained by fractionating a petroleum-based binder through solvent extraction to a carbonaceous resource. As a result, it was found that some fractions have a greater spontaneous heating suppression effect than adding the petroleum-based binder itself, even at the same addition rate. Because petroleum-based binders are obtained by distilling and refining petroleum, similar effects can be expected when petroleum-like carbonaceous materials, i.e., carbonaceous resources or carbonaceous resource dry distillation products, are fractionated through solvent extraction. This embodiment was made based on the above findings.

[0013] 2. Method for producing a spontaneous heat generation inhibitor for a 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 whose spontaneous heat generation is to be suppressed 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 pyrolysis 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, etc. The pyrolysis product of the first carbon resource is, for example, a pyrolysis product (ASP) obtained using petroleum as a raw material.

[0015] The components contained in the carbon resource dry distillation product are substances described on pages 479-526 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 as follows: 1. 2 g of the first carbon resource is placed in a centrifuge tube. 2. 50 cc of hexane is added to the centrifuge tube in step 1, and ultrasonic vibration is applied for 10 minutes. 3. The centrifuge tube in step 2 is centrifuged for solid-liquid separation. 4. The supernatant obtained in step 3 is recovered and filtered using filter paper to obtain the extracted components (hexane-soluble components). 5. The extraction residue in the centrifuge tube after step 4 is subjected to steps 2 to 4 twice (for a total of three times). 6. The extract obtained in steps 1 to 5 is subjected to an evaporator to remove the solvent (hexane). 7. The extract (hexane-soluble components) and extraction residue (hexane-insoluble components) recovered in step 6, and the extraction residue on the filter paper (hexane-insoluble components) recovered in steps 1 to 5 are placed in a vacuum dryer and allowed to stand at 80°C for 12 hours to remove the solvent contained in the extraction residue, thereby obtaining the hexane-soluble components and hexane-insoluble components.

[0018] The method for producing a spontaneous heat generation inhibitor for a second carbon resource may be terminated when the spontaneous heat generation inhibitor for a second carbon resource (HS) is obtained, but the following second step may also be 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. In this way, a spontaneous heat generation inhibitor for a second carbon resource (HI-TS) is obtained. As shown in the examples, the spontaneous heat generation inhibitor for a second carbon resource (HI-TS) has a sufficient spontaneous heat generation inhibitory effect.

[0019] More specifically, the second step is carried out according to the following procedure. 8. Repeat steps 1 to 7 multiple times to obtain 2 g or more of hexane-insoluble components, and collect 2 g of the hexane-insoluble components and place them in a centrifuge tube. 9. Add 50 cc of toluene to the centrifuge tube 8 and apply ultrasonic vibration for 10 minutes. 10. Place the centrifuge tube 9 in a centrifuge for solid-liquid separation. 11. Collect the supernatant obtained in step 10 and filter to obtain the extracted components (toluene-soluble components). 12. Repeat steps 9 to 11 twice on the extraction residue in the centrifuge tube after step 11 (for a total of three times). 13. Place the extract obtained by steps 11 to 12 above in an evaporator to remove the solvent (toluene). 14. The extract (toluene-soluble component) and extraction residue (toluene-insoluble component) recovered in the operation of 13, and the extraction residue (toluene-insoluble component) on the filter paper recovered in the operations up to 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, thereby obtaining a hexane-insoluble / toluene-soluble component and a toluene-insoluble component.

[0020] The first step may include a mixing step of a first carbon resource and hexane (corresponding to steps 1 and 2 above), a solid-liquid separation step of the mixture of the first carbon resource and hexane (corresponding to step 3 above), and a filtration step (corresponding to step 4 above), performed 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 then performing a solid-liquid separation step and a filtration step. Alternatively, the first step may include a first hexane removal step (corresponding to step 6 above) in which hexane is removed after the filtration step. Alternatively, the first step may include 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 include 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), carried out in this order. Alternatively, the second step may include adding toluene again to the residue after the filtration step (corresponding to step 9 above), and then further carrying out a solid-liquid separation step and a filtration step. Alternatively, the second step may include a first toluene removal step (corresponding to step 13 above) in which toluene is removed after the filtration step. Alternatively, the second step may include a second toluene removal step (corresponding to step 14 above) in which toluene is removed from the toluene-soluble component (extract component) and the toluene-insoluble component (residue) 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 should be read as the toluene-insoluble component, and the hexane-insoluble component in 8 above should be read as 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. Spontaneous Heat Generation Inhibitor for Second Carbon Resource> 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 therefore be produced at low cost.

[0024] "Soluble" refers to the state in which a solid or solid substance becomes liquid when a solvent is added to a compound. Alternatively, "soluble" refers to the state in which 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 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) is 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, which increases the cost. In contrast, the second method for producing a spontaneous heat generation inhibitor for carbon resources according to this embodiment can be carried out at room temperature and atmospheric pressure, which has the advantage of being low cost.

[0026] 4. Method for Suppressing Spontaneous Heat Generation of a Second Carbon Resource 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, 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, because the spontaneous heat generation inhibitor is uniformly added to the carbon resource and kneaded, 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. Method for Storing a Second Carbon Resource The method for storing a second carbon resource according to this embodiment involves storing the mixture obtained by the method for suppressing spontaneous heat generation of a second carbon resource. The atmosphere during storage is not particularly limited, and the mixture may be stored in the air.

[0028] 6. Use as a spontaneous heat generation inhibitor 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 soluble in hexane, or insoluble in hexane and soluble in toluene, as a spontaneous heat generation inhibitor. The first carbon resource may include any one or more selected from petroleum, coal, and biomass carbonaceous materials. The spontaneous heat generation inhibitor for the second carbon resource may have the features of the above-described embodiment. Furthermore, the spontaneous heat generation inhibitor for the second carbon resource may be produced by the above-described production method.

[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, an additive (HS), which was the residue obtained by evaporating the hexane, was obtained.

[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 yielded 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) had been added, 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 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 1.

[0034] 1, the horizontal axis 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 was acacia carbonaceous material alone, graph L2 shows the test results when the sample was acacia carbonaceous material with 5% by mass of ASP added, graph L3 shows the test results when the sample was acacia carbonaceous material with 5% by mass of additive (HS) added, graph L4 shows the test results when the sample was acacia carbonaceous material with 5% by mass of additive (HI-TS) added, and graph L5 shows the test results when the sample was acacia carbonaceous material with 5% by mass of additive (TI) added.

[0035] 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 had been added, the same amount of biomass carbonaceous material F to which 5% by mass (50 mg) of additive (HS) had been added, the same amount of biomass carbonaceous material F to which 5% by mass (50 mg) of additive (HI-TS) had been added, and the same amount of biomass carbonaceous material F to which 5% by mass (50 mg) of additive (TI) had been added.

[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] 2, the horizontal axis 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 was biomass carbonaceous material F alone, graph L2 shows the test results when the sample was biomass carbonaceous material F with 5% by mass of ASP added, graph L3 shows the test results when the sample was biomass carbonaceous material F with 5% by mass of an additive (HS) obtained from ASP added, graph L4 shows the test results when the sample was biomass carbonaceous material F with 5% by mass of an additive (HI-TS) obtained from ASP added, and graph L5 shows the test results when the sample was biomass carbonaceous material F with 5% by mass of an additive (TI) obtained from ASP added.

[0041] 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 carbonaceous material PC other than acacia was prepared as a second carbon resource whose spontaneous heat generation was to be suppressed.

[0043] A first carbon resource S other than 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 to which 5% by mass (50 mg) of additive (HS) was added, the same amount of biomass carbonaceous PC to which 5% by mass (50 mg) of additive (HI-TS) was added, and the same amount of biomass carbonaceous PC to which 5% by mass (50 mg) of additive (TI) was added.

[0045] 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 3.

[0046] 3, the horizontal axis 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 was biomass carbonaceous material PC alone, graph L2 shows the test results when the sample was biomass carbonaceous material PC to which 5% by mass of an additive (HS) obtained from carbon resource S was added, graph L3 shows the test results when the sample was biomass carbonaceous material PC to which 5% by mass of an additive (HI-TS) obtained from carbon resource S was added, and graph L4 shows the test results when the sample was biomass carbonaceous material PC to which 5% by mass of an additive (TI) obtained from carbon resource S was added.

[0047] 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 required for the temperature to reach 200°C was investigated when the type and amount of spontaneous heat generation inhibitor for the second carbon resource were changed. The second carbon resource to be subjected to spontaneous heat generation inhibition was 10 g of the above-mentioned 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] These samples were subjected to the spontaneous heating evaluation test described above. 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 to reach 200°C (min). 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 1% by mass of additive (HS) or additive (HI-TS).

[0050]

[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.

[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 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 which is soluble in hexane or insoluble in the hexane and soluble in toluene.

2. The spontaneous heat generation inhibitor for a second carbon resource according to claim 1, characterized in that the first carbon resource includes at least one selected from petroleum, coal, and biomass carbonaceous materials.

3. A method for producing a spontaneous heat generation inhibitor for a second carbon resource, comprising a first step of extracting a first carbon resource or a dry distillation product of the first carbon resource with hexane.

4. The method for producing a spontaneous heat generation inhibitor from a second carbon resource according to claim 3, further comprising a second step of extracting the insoluble residue from the first step with toluene.

5. A method for suppressing spontaneous heat generation in a second carbon resource, comprising the step of adding the spontaneous heat generation inhibitor for a second carbon resource according to claim 1 or 2 in an amount of 1 mass % or more to the first carbon resource.

6. 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 according to claim 5.