Natural heat suppression inhibitors for carbon resources, methods for manufacturing natural heat suppression inhibitors for carbon resources, methods for suppressing natural heat generation of carbon resources, and methods for storing carbon resources.

Abstract

This invention provides a spontaneous heating inhibitor for a second carbon resource, characterized in that it is a component contained in a first carbon resource or the dry distillation product of the aforementioned first carbon resource; and the spontaneous heating inhibitor is soluble in hexane, or insoluble in hexane but soluble in toluene. Furthermore, this invention provides a method for manufacturing a spontaneous heating inhibitor for a second carbon resource, characterized by comprising a first step of extracting the first carbon resource or the dry distillation product of the aforementioned first carbon resource with hexane. Moreover, this invention provides a method for inhibiting spontaneous heating of a second carbon resource and a method for storing the second carbon resource.

Description

[Technical Field]

[0001] This disclosure relates to a natural heating inhibitor of carbon resources, a method for manufacturing a natural heating inhibitor of carbon resources, a method for inhibiting natural heating of carbon resources, and a method for storing carbon resources. This case is based on Japanese Patent Application No. 2024-040975 filed in Japan on March 15, 2024, the contents of which are incorporated herein by reference. [Previous Technology]

[0002] For example, the steel industry uses a large amount of carbon resources. Here, carbon resources refer to resources containing carbon atoms. Carbon resources include, for example, those that can generate heat through the combustion of carbon atoms or those that can be used as reducing agents. Examples of carbon resources include petroleum, coal, and biochar. Biochar is charcoal obtained through the dry distillation of biomass.

[0003] Here, depending on the type of carbon resource, the spontaneous heating of the carbon resource can sometimes be a problem. For example, coal or wood-based biochar is prone to spontaneous heating. Therefore, careful temperature management is required when storing such materials in large quantities.

[0004] Patent documents 1-3 disclose a technology for suppressing the spontaneous combustion of carbon resources. Furthermore, patent document 4 discloses that a component obtained by extraction with an aprotic solvent is coated onto coal to suppress its spontaneous combustion. It also discloses an example in which coal is mixed with methylnaphthalene and extracted using an autoclave at a temperature of 360°C and a pressure of 2 MPa.

[0005] Prior Art Documents Patent Document 1: Japanese Patent Application Publication No. 2001-164254 Patent Document 2: Japanese Patent Application Publication No. 2011-201947 Patent Document 3: Japanese Patent Application Publication No. Sho 59-074189 Patent Document 4: Japanese Patent Application Publication No. 2007-161926 [Summary of the Invention]

[0006] Problems to be Solved by the Invention The inventors believe that the technologies disclosed in Patent Documents 1-4 are insufficient to suppress the spontaneous heating of carbon resources and are also disadvantageous in terms of cost. For example, Patent Document 4 is a technology that uses a limited environment such as an autoclave for extraction, which is disadvantageous in terms of cost. Furthermore, it is known that asphalt (e.g., a byproduct obtained during coal dry distillation) can suppress the spontaneous heating of carbon resources. For example, the spontaneous heating of carbon resources can be suppressed by kneading asphalt and carbon resources. This can be attributed to the fact that by covering the carbon resource particles with asphalt, contact between the carbon resources and oxygen can be prevented, and free radical reactions can be suppressed by supplying hydrogen atoms to the carbon resources from the asphalt. However, the manufacture of asphalt is costly and generates a large amount of CO2 gas during the manufacture of asphalt.

[0007] This disclosure is made in view of the above-mentioned problems. The purpose of this disclosure is to provide a natural heating inhibitor of carbon resources that can be manufactured at low cost and can be effective with a small amount.

[0008] The means to solve the problem are as follows. (1) A natural heating inhibitor of a second carbon resource, characterized in that: it is a component contained in the first carbon resource or the dry distillation product of the aforementioned first carbon resource; and the natural heating inhibitor is soluble in hexane, or insoluble in the aforementioned hexane but soluble in toluene. (2) The natural heating inhibitor of the second carbon resource as in (1), wherein the aforementioned first carbon resource includes one or more selected from petroleum, coal and biochar. (3) A method for manufacturing a natural heating inhibitor of a second carbon resource, characterized in that it includes a first step of extracting the first carbon resource or the dry distillation product of the aforementioned first carbon resource with hexane. (4) The method for manufacturing a natural heating inhibitor of the second carbon resource as in (3), including a second step of extracting the insoluble residue of the aforementioned first step with toluene. (5) A method for inhibiting the natural heating of a second carbon resource, characterized in that it includes a step of adding 1% by mass or more of the natural heating inhibitor of the second carbon resource as in (1) or (2) to the aforementioned first carbon resource. (6) A method for storing a second carbon resource, characterized in that the storage is a mixture prepared by the natural heating suppression method of the second carbon resource as described in (5).

[0009] Effects of the Invention According to this disclosure, a carbon resource spontaneous heating inhibitor that can be manufactured at low cost and is effective with a small amount can be provided. Furthermore, according to this disclosure, a method for manufacturing a carbon resource spontaneous heating inhibitor can be provided, which can be manufactured at low cost and is effective with a small amount. Furthermore, according to this disclosure, a method for suppressing the spontaneous heating of carbon resources and a method for storing carbon resources can be provided, wherein the method for suppressing the spontaneous heating of carbon resources uses a carbon resource spontaneous heating inhibitor that is low cost and is effective with a small amount.

Implementation Method

[0011] The preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings. Furthermore, it should be understood that the invention is not limited to the examples described below. Specific numerical values ​​or materials may be illustrated in the following description; however, other numerical values ​​or materials may be applied as long as the inventive effects of the invention are achieved. Also, the constituent elements of the following embodiments can be combined with each other. Additionally, in this specification, the numerical range indicated by "~" refers to a range including the values ​​described before and after "~" as both a lower and upper limit. In this specification, the term "step" does not refer only to an independent step; even if it cannot be clearly distinguished from other steps, it is still included in this terminology if the desired purpose of the step is achieved.

[0012] <1. Inventor's Knowledge and Insight> The inventor has discovered that petroleum-based binders (and sometimes, depending on the application, binders are also called adhesives) used as binders for inferior charcoal can effectively suppress the spontaneous heating of carbon resources. Spontaneous heating refers to the heating of air at room temperature and atmospheric pressure. Petroleum-based binders are mixtures obtained by distilling and purifying petroleum. Therefore, the inventor has extracted petroleum-based binders by solvent extraction and added the extracted components to carbon resources. It has been found that there is one extracted component that, even at the same addition rate, has a greater effect on suppressing spontaneous heating than adding the petroleum-based binder itself. Furthermore, since petroleum-based binders are obtained by distilling and purifying petroleum, the same effect can be expected when extracting petroleum-like charcoal materials, i.e., carbon resources or carbon distillation products, by solvent extraction. This embodiment is made based on the above knowledge and insight.

[0013] <2. Method for Manufacturing a Natural Heating Inhibitor from a Second Carbon Resource> This describes a method for manufacturing a natural heating inhibitor from a carbon resource. In this specification, the carbon resource that can be used as a raw material for the natural heating inhibitor is referred to as the first carbon resource, and the carbon resource used to inhibit natural heating is referred to as the second carbon resource (or simply as carbon resource). The first carbon resource and the second carbon resource are sometimes different and sometimes the same.

[0014] First, prepare the raw materials. Here, the raw materials are first carbon resources or the dry distillation products of first carbon resources. First carbon resources are resources containing carbon atoms, and are those from which heat can be obtained by burning carbon atoms. Examples of first carbon resources are petroleum, coal, and biochar. Examples of dry distillation products of first carbon resources are charcoal obtained by dry distilling coal or biochar, more specifically, coal tar, etc. Examples of dry distillation products of first carbon resources are dry distillation products (ASP) obtained from petroleum as a raw material.

[0015] The components contained in the carbon distillation products are the substances recorded on pages 479-526 of the "Handbook of Aromatics and Tar Industries, Third Edition (Japan Aromatics Industry Association)".

[0016] Next, the first carbon resource or the pyrolysis product of the first carbon resource is extracted with hexane (step 1). Specifically, for example, the first carbon resource or the pyrolysis product of the first carbon resource is thoroughly mixed with hexane and allowed to stand. Then, the liquid portion is recovered, and the hexane is removed from the liquid portion. Thereby, a spontaneous heating inhibitor (HS) for the second carbon resource is obtained. As shown in the examples, the spontaneous heating inhibitor (HS) for the second carbon resource has a sufficient spontaneous heating inhibition effect.

[0017] More specifically, step 1 is performed according to the following procedure: 1. Place 2g of the first carbon resource into a centrifuge tube. 2. Add 50cc of hexane to the centrifuge tube in step 1 and apply ultrasonic vibration for 10 minutes. 3. Place the centrifuge tube in step 2 into a centrifuge for solid-liquid separation. 4. Recover the supernatant obtained from step 3 and filter it using filter paper to obtain the extract (the component soluble in hexane). 5. Repeat steps 2 to 4 twice for the extraction residue in the centrifuge tube after step 4 (a total of 3 times). 6. Place the extract obtained from the steps up to step 5 into a distiller to remove the solvent (hexane). 7. Place the extract (hexane-soluble components) recovered in step 6, the extraction residue (hexane-insoluble components), and the extraction residue (hexane-insoluble components) on the filter paper recovered in steps 5 into a vacuum dryer. Let it stand at 80°C for 12 hours to remove the solvent contained in the extraction residue, thereby obtaining the hexane-soluble and hexane-insoluble components.

[0018] The method for manufacturing the spontaneous pyrolysis inhibitor of the second carbon resource can be terminated after obtaining the spontaneous pyrolysis inhibitor (HS) of the second carbon resource, or the following second step can be performed. That is, the insoluble residue of the first step is extracted with toluene (second step). For example, the insoluble residue of the first step is thoroughly mixed with toluene and allowed to stand. Then, the liquid portion is recovered, and the toluene is removed from the liquid portion. Thereby, the spontaneous pyrolysis inhibitor of the second carbon resource (HI-TS) is obtained. As shown in the examples, the spontaneous pyrolysis inhibitor of the second carbon resource (HI-TS) has a sufficient spontaneous pyrolysis inhibition effect.

[0019] More specifically, step 2 is performed according to the following procedure: 8. Repeat steps 1 to 7 several times to obtain at least 2g of the hexane-insoluble component, recover 2g of the hexane-insoluble component, and place it in a centrifuge tube. 9. Add 50cc of toluene to the centrifuge tube from step 8 and apply ultrasonic vibration for 10 minutes. 10. Place the centrifuge tube from step 9 into a centrifuge for solid-liquid separation. 11. Recover the supernatant obtained from step 10 and filter it to obtain the extract (the component soluble in toluene). 12. Repeat steps 9 to 11 twice for the extraction residue in the centrifuge tube after step 11 (a total of 3 times). 13. Place the extract obtained from the steps up to 12 above into a distiller to remove the solvent (toluene). 14. Place the extract (components soluble in toluene) recovered in step 13, the extraction residue (components insoluble in toluene), and the extraction residue (components insoluble in toluene) on the filter paper recovered in steps up to 12 into a vacuum dryer. Let it stand at 80°C for 12 hours to remove the solvent contained in the extraction residue, thereby obtaining components insoluble in hexane but soluble in toluene and components insoluble in toluene.

[0020] As a first step, a mixing step of the first carbon resource and hexane (corresponding to 1 and 2 above), a solid-liquid separation step of the mixture of the first carbon resource and hexane (corresponding to 3 above), and a filtration step (corresponding to 4 above) may also be performed sequentially. Furthermore, as a first step, hexane may be added again to the residue after the filtration step (corresponding to 2 above), and then the solid-liquid separation step and the filtration step may be performed again. Also, as a first step, a first hexane removal step (corresponding to 6 above) may be performed after the filtration step. Moreover, as a first step, a second hexane removal step (corresponding to 7 above) may be performed after the first hexane removal step, which removes the hexane from the hexane-soluble components of the extract and the hexane-insoluble components of the residue.

[0021] Similar to step 1, step 2 may also sequentially include a mixing step of the hexane-insoluble component and toluene (corresponding to 8 and 9 above), a solid-liquid separation step of the mixture of the hexane-insoluble component and toluene (corresponding to 10 above), and a filtration step (corresponding to 11 above). Furthermore, step 2 may also involve adding toluene again to the residue after the filtration step (corresponding to 9 above), followed by a solid-liquid separation step and a filtration step. Furthermore, step 2 may also include a first toluene removal step (corresponding to 13 above) after the filtration step. Moreover, step 2 may also include a second toluene removal step (corresponding to 14 above) after the first toluene removal step, which removes toluene from both the toluene-soluble components of the extract and the toluene-insoluble components of the residue.

[0022] Furthermore, while an example of performing step 2 after step 1 has been previously described, step 1 can also be performed after step 2. When step 1 is performed after step 2, the first carbon resource of 1 above is replaced by a component insoluble in toluene, and the component of 8 above that is insoluble in hexane is replaced by a first carbon resource. The components soluble in hexane and soluble in toluene, and the order of the extraction operation with toluene and the extraction operation with hexane are not related.

[0023] <3. Spontaneous Emission Inhibitor of Second Carbon Resource> Therefore, the spontaneous emission inhibitor of the second carbon resource in this embodiment is a component contained in the first carbon resource or the dry distillation product of the first carbon resource, and the spontaneous emission inhibitor is soluble in hexane, or insoluble in hexane but soluble in toluene. The spontaneous emission inhibitor of the second carbon resource in this embodiment can be manufactured by solvent extraction of the first carbon resource or the dry distillation product of the first carbon resource, and therefore can be manufactured at low cost.

[0024] Solubility refers to the state where a solid or solid substance becomes liquid when a solvent is added to the compound. Alternatively, solubility refers to the state where other liquid compounds are mixed into a liquid to form a homogeneous liquid. Furthermore, solubility refers to the maximum amount of solute that can dissolve in a solvent at any temperature. When the extraction operations of steps 1 and 2 described above are performed on the spontaneously heating inhibitor, and a total of 1% by mass or more of the component soluble in hexane and / or the extract component insoluble in hexane but soluble in toluene (excluding residue) is obtained, the spontaneously heating inhibitor conforms to this embodiment.

[0025] For example, the coal coating agent disclosed in Patent Document 4 is manufactured at high temperature, thus increasing the cost. In contrast, the method for manufacturing the natural heating inhibitor of the second carbon resource in this embodiment can be carried out at room temperature and pressure, thus having the advantage of low cost.

[0026] <4. Method for Suppressing Spontaneous Heating of Second Carbon Resource> The method for suppressing spontaneous heating of second carbon resource in this embodiment involves adding 1% by mass or more of the spontaneous heating inhibitor of the second carbon resource of this embodiment to the second carbon resource. Therefore, the effect is achieved using a small amount of the spontaneous heating inhibitor of the second carbon resource. As shown in the example, by setting the mass ratio of the spontaneous heating inhibitor of the second carbon resource to 1% by mass or more, a sufficient spontaneous heating suppression effect can be obtained. Furthermore, based on the reason of homogenizing the addition of the spontaneous heating inhibitor to the carbon resource and kneading it, it is more appropriate to add 3% by mass or more of the spontaneous heating inhibitor of the second carbon resource to the second carbon resource. Furthermore, there is no particular upper limit to the mass ratio, but it is, for example, 30% by mass or less. Alternatively, since the spontaneous heating inhibitor has high viscosity, if the mass ratio is high, the processability will deteriorate. For this reason, it is also possible to add less than 20% by mass of the second spontaneous heating inhibitor to the second carbon resource, and it is more appropriate to add less than 10% by mass of the second spontaneous heating inhibitor.

[0027] <5. Storage Method for Second Carbon Resources> The storage method for second carbon resources in this embodiment is to store a mixture obtained by a method for suppressing the natural heating of second carbon resources. There are no particular restrictions on the gas environment during storage, and it can also be stored in the atmosphere.

[0028] <6. Use as a spontaneous heating inhibitor> This disclosure also includes the use of a spontaneous heating inhibitor from a second carbon resource as a spontaneous heating inhibitor, characterized in that: it is a component contained in a first carbon resource or a dry distillation product of a first carbon resource; and the spontaneous heating inhibitor is soluble in hexane, or insoluble in hexane but soluble in toluene. The first carbon resource may also contain one or more selected from petroleum, coal, and biochar. The spontaneous heating inhibitor from the second carbon resource may also possess the characteristics of the above-described embodiment. Furthermore, the spontaneous heating inhibitor from the second carbon resource may also be manufactured by the above-described manufacturing method.

[0029] Example (Example 1) Next, an example of this embodiment will be described. In this example, woody biochar material derived from the acacia tree was prepared as a second carbon resource to suppress spontaneous heating. Woody biochar material derived from the acacia tree has high spontaneous heating properties. Hereinafter, woody biochar material derived from the acacia tree will be simply referred to as acacia charcoal material.

[0030] On the other hand, a natural heating inhibitor for the second carbon resource was prepared by the following steps. Specifically, firstly, a petroleum-derived carbon distillation product (ASP) was prepared. Here, a commercially available ASP was used. Next, following the procedure described in the above embodiment, 2g of ASP was extracted with 50cc of hexane (step 1). The extraction conditions were carried out at a temperature of 25°C and a pressure of atmospheric pressure. Afterward, the residue from which the hexane had been evaporated, i.e., the additive (HS), was obtained.

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

[0032] Next, a natural heating evaluation test was conducted. The following samples were prepared: 1.00g of acacia charcoal, 0.95g of acacia charcoal with 5% (50mg) ASP added, the same amount of acacia charcoal with 5% (50mg) additive (HS) added, the same amount of acacia charcoal with 5% (50mg) additive (HI-TS) added, and the same amount of acacia charcoal with 5% (50mg) additive (TI) added.

[0033] Next, 1g of the sample was taken and filled into the sample tank of the self-heating evaluation device. Then, after the sample tank was placed in the sample holding chamber and the device was replaced with a nitrogen atmosphere, the sample temperature was raised to 130°C under nitrogen. The sample temperature was measured using a thermocouple. Afterwards, the gas environment inside the device was switched from nitrogen to air, and the experiment was started to measure the temperature behavior of the sample. The results are shown in Figure 1.

[0034] The horizontal axis of Figure 1 represents the elapsed time (minutes) from the start of the natural heating assessment test, and the vertical axis represents the sample temperature. Curve L1 shows the test results when the sample is only acacia charcoal, curve L2 shows the test results when 5% by mass of ASP is added to acacia charcoal, curve L3 shows the test results when 5% by mass of additive (HS) is added to acacia charcoal, curve L4 shows the test results when 5% by mass of additive (HI-TS) is added to acacia charcoal, and curve L5 shows the test results when 5% by mass of additive (TI) is added to acacia charcoal.

[0035] As can be clearly seen from curves L1 to L5 in Figure 1, when the natural heating inhibitor (HS) of the second carbon resource described above, i.e., when the additive (HS) or the natural heating inhibitor (HI-TS) of the second carbon resource is added to the second carbon resource (Acacia charcoal), a significant natural heating inhibition effect can be obtained, and the reproducibility is high. In particular, a greater effect was obtained when the natural heating inhibitor (HI-TS) of the second carbon resource was added.

[0036] (Example 2) In this example, woody biochar material F other than acacia tree was prepared as a second carbon resource to suppress natural heating.

[0037] The same ASP as in Example 1 was prepared as a natural heating inhibitor for the second carbon resource. Furthermore, an additive (HS) was prepared from the ASP according to the same procedure as in Example 1, as a natural heating inhibitor for the second carbon resource. Next, an additive (HI-TS) and an additive for insoluble residues (TI) were prepared from the ASP according to the same procedure as in Example 1, as natural heating inhibitors for the second carbon resource.

[0038] Next, a natural heating evaluation test was conducted. The following were prepared as test materials: 1.00g of biochar material F, 0.95g of biochar material F with 5% by mass (50mg) of ASP added, biochar material F with 5% by mass (50mg) of additive (HS) added, biochar material F with 5% by mass (50mg) of additive (HI-TS) added, and biochar material F with 5% by mass (TI) added.

[0039] Next, 1g of the sample was taken and filled into the sample tank of the self-heating evaluation device, similar to Example 1. Then, after the sample tank was placed in the sample holding chamber and the device was replaced with a nitrogen atmosphere, the sample temperature was raised to 130°C under nitrogen. The sample temperature was measured using a thermocouple. Afterwards, the gas environment inside the device was switched from nitrogen to air, and the experiment was started to measure the temperature behavior of the sample. The results are shown in Figure 2.

[0040] The horizontal axis of Figure 2 represents the elapsed time (minutes) from the start of the natural heating assessment test, and the vertical axis represents the sample temperature. Curve L1 shows the test results when the sample is only biochar material F, curve L2 shows the test results when 5% by mass of ASP is added to biochar material F, curve L3 shows the test results when 5% by mass of additive (HS) from ASP is added to biochar material F, curve L4 shows the test results when 5% by mass of additive (HI-TS) from ASP is added to biochar material F, and curve L5 shows the test results when 5% by mass of additive (TI) from ASP is added to biochar material F.

[0041] As can be clearly seen from curves L1 to L5 in Figure 2, when the natural heating inhibitor (HS) of the second carbon resource of the above embodiment is added to the second carbon resource (biochar material F), that is, when the additive (HS) or the natural heating inhibitor (HI-TS) of the second carbon resource is added, a significant natural heating inhibition effect can be obtained, and the reproducibility is high. In particular, a greater effect is obtained when the natural heating inhibitor (HI-TS) of the second carbon resource is added.

[0042] (Example 3) In this example, a woody biochar material PC other than acacia tree was prepared as a second carbon resource to suppress natural heat generation.

[0043] A first carbon resource S that is not ASP is prepared as a natural heating inhibitor for a second carbon resource. Furthermore, an additive (HS) is prepared from carbon resource S according to the same procedure as in Example 1, as a natural heating inhibitor for the second carbon resource. Next, an additive (HI-TS) and an additive for insoluble residue (TI) are prepared from carbon resource S according to the same procedure as in Example 1, as natural heating inhibitors for the second carbon resource.

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

[0045] Next, 1g of the sample was taken and filled into the sample tank of the self-heating evaluation device, similar to Example 1. Then, after the sample tank was placed in the sample holding chamber and the device was replaced with a nitrogen atmosphere, the sample temperature was raised to 130°C under nitrogen. The sample temperature was measured using a thermocouple. Afterwards, the gas environment inside the device was switched from nitrogen to air, and the experiment was started to measure the temperature behavior of the sample. The results are shown in Figure 3.

[0046] The horizontal axis of Figure 3 represents the elapsed time (minutes) from the start of the natural heating assessment test, and the vertical axis represents the sample temperature. Curve L1 shows the test results when the sample is only biochar material PC, curve L2 shows the test results when 5% by mass of additive (HS) derived from carbon resource S is added to biochar material PC, curve L3 shows the test results when 5% by mass of additive (HI-TS) derived from carbon resource S is added to biochar material PC, and curve L4 shows the test results when 5% by mass of additive (TI) derived from carbon resource S is added to biochar material PC.

[0047] As can be clearly seen from curves L1 to L4 in Figure 3, when the natural heating inhibitor (HS) of the second carbon resource of the above embodiment is added to the second carbon resource (biochar material PC), that is, when the additive (HS) or the natural heating inhibitor (HI-TS) of the second carbon resource is added, a natural heating inhibition effect can be obtained. In particular, a greater effect is obtained when the natural heating inhibitor (HI-TS) of the second carbon resource is added.

[0048] (Example 4) Next, the time to reach 200°C was investigated when the type and amount of the natural heating inhibitor of the second carbon resource were changed. The second carbon resource to be used to inhibit natural heating was 10g of acacia charcoal material as previously described, and ASP, additive (HS), additive (HI-TS) and additive (TI) were added to it in any one of the following amounts: 1%, 3%, and 5% by mass.

[0049] The previously described spontaneous heating evaluation test was performed on these samples. Then, the time from the start of the test to the sample temperature reaching 200°C (200°C arrival time) was measured. The results are shown in Table 1. The values ​​in the table show the 200°C arrival time (minutes). As shown in Table 1, if additive (HS) or additive (HI-TS) is used, the 200°C arrival time that cannot be obtained without adding 5% by mass of ASP can be obtained with 1% by mass.

[0050] [Table 1]

[0051] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings, but this disclosure is not limited to the examples described. It is obvious that anyone with common knowledge in the technical field to which this disclosure pertains can conceive of various modifications or alterations within the scope of the technical concept described in the claims, and understand that such modifications or alterations should also fall within the technical scope of this disclosure.

[0052] Industrial Applicability According to this disclosure, a carbon resource spontaneous emission inhibitor that can be manufactured at low cost and is effective with a small amount can be provided. Furthermore, according to this disclosure, a method for manufacturing a carbon resource spontaneous emission inhibitor can be provided, which can be manufactured at low cost and is effective with a small amount. Furthermore, according to this disclosure, a method for suppressing the spontaneous emission of carbon resources and a method for storing carbon resources can be provided, wherein the method for suppressing the spontaneous emission of carbon resources uses a low-cost carbon resource spontaneous emission inhibitor that is effective with a small amount. Therefore, the invention disclosed herein is extremely useful in industry. [Simplified Explanation of the Diagram]

[0010] Figure 1 is a graph of Example 1, showing the relationship between the elapsed time and sample temperature from the start of the spontaneous heating assessment test. Figure 2 is a graph of Example 2, showing the relationship between the elapsed time and sample temperature from the start of the spontaneous heating assessment test. Figure 3 is a graph of Example 3, showing the relationship between the elapsed time and sample temperature from the start of the spontaneous heating assessment test.

Claims

1. A spontaneous heating inhibitor of a second carbon resource, characterized in that: it is a component contained in the first carbon resource or the dry distillation product of the aforementioned first carbon resource; and the spontaneous heating inhibitor is insoluble in hexane but soluble in toluene.

2. The natural heating inhibitor of the second carbon resource as claimed in claim 1, wherein the aforementioned first carbon resource includes one or more selected from petroleum, coal and biochar.

3. A method for manufacturing a natural heating inhibitor of a second carbon resource, characterized by comprising: a first step of extracting a first carbon resource or the dry distillation product of the aforementioned first carbon resource with hexane; and a second step of extracting the insoluble residue of the aforementioned first step with toluene.

4. A method for suppressing spontaneous heating of a second carbon resource, characterized in that it comprises the step of adding at least 1% by mass of a spontaneous heating inhibitor of the second carbon resource as claimed in claim 1 or 2 to the aforementioned second carbon resource.

5. A method for storing a second carbon resource, characterized in that: the storage is a mixture obtained by the natural heating suppression method for the second carbon resource as described in claim 4.

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