Carbon resource natural heating inhibitor, carbon resource natural heating inhibition method, and carbon resource storage method

Abstract

Provided is a natural heating inhibitor for carbon resources, characterized by containing a naphthenic ring carbon atom at a proportion of 1 mmol / g or more. Also provided is a method for inhibiting natural heating of carbon resources, characterized by including a step of adding a natural heating inhibitor for carbon resources to carbon resources, the natural heating inhibitor for carbon resources being characterized by containing a naphthenic ring carbon atom at a proportion of 1 mmol / g or more, and a method for storing carbon resources, characterized by storing a mixture obtained by the method for inhibiting natural heating of carbon resources.

Description

Technical Field

[0001] This invention relates to a natural heating inhibitor of carbon resources, a method for inhibiting natural heating of carbon resources, and a method for storing carbon resources.

[0002] This invention claims priority based on Japanese Patent Application No. 2024-040976 filed in Japan on March 15, 2024, the contents of which are incorporated herein by reference. Background Technology

[0003] For example, the steel industry uses a large amount of carbon resources. Here, carbon resources are resources containing carbon atoms. Carbon resources include substances that generate heat through the combustion of carbon atoms or substances used as reducing agents. Examples of carbon resources include petroleum, coal, and biomass charcoal. Biomass charcoal is charcoal obtained through the dry distillation of biomass.

[0004] Here, depending on the type of carbon resource, the spontaneous heating of the carbon resource can sometimes become a problem. For example, coal and wood-based biochar are prone to spontaneous heating. Therefore, when storing them in large quantities, temperature management requires more careful attention.

[0005] Patent documents 1-3 disclose technologies for suppressing the natural heating of carbon resources.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2001-164254

[0009] Patent Document 2: Japanese Patent Application Publication No. 2011-201947

[0010] Patent Document 3: Japanese Patent Application Publication No. 59-074189 Summary of the Invention

[0011] The problem the invention aims to solve

[0012] The inventors believe that the technologies disclosed in Patent Documents 1 to 3 cannot adequately suppress the natural heating of carbon resources.

[0013] The present invention was made in view of the above-mentioned problems, and the object of the present invention is to provide a carbon resource spontaneous heating inhibitor that can more reliably suppress the spontaneous heating of carbon resources.

[0014] Solution for solving the problem

[0015] The main points of this invention are as follows. (1)

[0017] A natural heat inhibitor of carbon resources, characterized in that it contains cycloalkane cyclic carbon atoms at a ratio of more than 1 mmol / g. (2)

[0019] The natural heating inhibitor of carbon resources according to (1) is characterized in that it contains cycloalkane cyclic carbon atoms in a proportion of 5 mmol / g or more. (3)

[0021] The natural heating inhibitor of carbon resources according to (1) or (3) is characterized in that the cycloalkane ring having the above-mentioned cycloalkane ring carbon atoms has unsaturated carbon bonds. (4)

[0023] According to the natural heating inhibitor of carbon resources described in (3), the unsaturated carbon bond is an aromatic carbon bond. (5)

[0025] The natural heating inhibitor of carbon resources according to (1) or (2) is characterized in that it has a fused ring structure in its molecular structure, wherein the fused ring structure contains cycloalkane ring carbon atoms. (6)

[0027] The natural heating inhibitor of carbon resources according to any one of (1) to (5) is characterized in that it is composed of a mixture with a molecular weight of 200 to 1000. (7)

[0029] The natural heating inhibitor of carbon resources according to any one of (1) to (6) is characterized in that it is a solid at room temperature. (8)

[0031] The natural heating inhibitor of carbon resources according to any one of (1) to (7) is characterized in that it is a component contained in the carbon resources or the dry distillation product of said carbon resources. (9)

[0033] A method for suppressing the spontaneous heating of carbon resources, characterized in that it includes a step of adding at least 1% by mass of any one of (1) to (8) a spontaneous heating inhibitor of carbon resources relative to the carbon resources. (10)

[0035] A method for storing carbon resources, characterized in that the storage is a mixture obtained by the natural heating suppression method of carbon resources described in (9).

[0036] The effects of the invention

[0037] According to the present invention, a carbon resource spontaneous heating inhibitor that can more reliably suppress the spontaneous heating of carbon resources can be provided. Furthermore, according to the present invention, a carbon resource spontaneous heating suppression method and a carbon resource storage method that can more reliably suppress the spontaneous heating of carbon resources can be provided. Attached Figure Description

[0038] Figure 1 It is a graph showing the relationship between the elapsed time and the sample temperature from the start of the natural heating evaluation test. Detailed Implementation

[0039] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that this disclosure is not limited to the examples described below. In the following description, specific numerical values ​​and materials are sometimes illustrated, but other numerical values ​​and materials can be applied as long as the effects of the present invention are achieved. Furthermore, the constituent elements of the following embodiments can be combined with each other. Additionally, in this specification, the numerical range indicated by "~" refers to the range including the values ​​before and after "~" as both the lower and upper limits. In this specification, the term "process" is not limited to an independent process; even when it is difficult to clearly distinguish it from other processes, it is included in this terminology as long as the desired objective of the process can be achieved.

[0040] <1. The inventor's insights>

[0041] The spontaneous heating of carbon resources has been attributed to free radicals generated from substances contained within them. Furthermore, a key chemical property of cycloalkanes is considered to be their hydrogen-donating ability; for example, in coal liquefaction, they supply hydrogen to the thermal decomposition free radicals of coal, stabilizing low-molecular-weight compounds derived from coal. Spontaneous heating refers to heating in an oxygen atmosphere, or heating in air at normal atmospheric pressure.

[0042] Here, cycloalkane ring refers to a ring structure with a 4- to 6-membered ring composed of carbon atoms, and the ring structure contains carbon atoms bonded to two hydrogen atoms (cycloalkane ring carbon atoms).

[0043] The cyclic structure that makes up a cycloalkane ring can be a single cyclic structure or a fused cyclic structure.

[0044] The following shows an example of the chemical structure of a cycloalkane ring. In the example below, the carbon atom at the position enclosed by the dashed circle is a carbon atom of the cycloalkane ring.

[0045]

[0046] In the examples above, the cycloalkane rings in (a), (c), or (d) have unsaturated bonds in their cyclic structures. The cycloalkane ring in (b) has a cyclic structure composed of saturated bonds. The cycloalkane ring in (d) is formed by the fusion of two cyclic structures.

[0047] It should be noted that the above examples only show a portion of the molecular structure, and the compounds constituting the natural fever suppressants of this embodiment are not limited to those having the compounds described above. That is, as part of the structure of the compounds described later, they may contain the cycloalkane rings described above. For example, any of the carbon atoms constituting the cycloalkane rings may be bonded to carbon atoms or other functional groups to form a compound.

[0048] Cycloalkanes readily release hydrogen atoms from their cyclic carbon atoms. That is, cycloalkanes possess hydrogen-donating properties. Therefore, the inventors believe that the hydrogen atoms released by cycloalkanes can capture free radicals that can induce spontaneous heating of carbon resources, thus suppressing the spontaneous heating of carbon resources. However, to date, there has been no quantitative research on the necessary proportion of cycloalkanes containing cyclic carbon atoms to suppress the spontaneous heating of carbon resources.

[0049] It should be noted that substances containing cycloalkane cyclic carbon atoms that are relatively inexpensive and readily available can be exemplified by petroleum-based asphalt. However, since it is the cycloalkane cyclic carbon atoms that suppress the spontaneous heating of carbon resources, substances containing a large number of cycloalkane cyclic carbon atoms should function as inhibitors of the spontaneous heating of carbon resources, regardless of their source. This embodiment was completed based on the above understanding.

[0050] <2. Inhibitors of Natural Heating from Carbon Resources>

[0051] The spontaneous heating inhibitor of carbon resources in this embodiment (hereinafter also referred to as "spontaneous heating inhibitor") is a substance having a molecular structure containing a cycloalkane ring, and containing cycloalkane ring carbon atoms at a ratio of 1 mmol / g or more. As described above, cycloalkane ring carbon atoms have hydrogen-donating properties. Therefore, hydrogen atoms released from cycloalkane ring carbon atoms can capture free radicals that can induce spontaneous heating of carbon resources, thus inhibiting the spontaneous heating of carbon resources. However, as shown in the examples described later, this effect is obtained when the spontaneous heating inhibitor contains at least 1 mmol / g of cycloalkane ring carbon atoms.

[0052] The natural fever inhibitor of this embodiment preferably contains cycloalkane cyclic carbon atoms at a ratio of 5 mmol / g or more.

[0053] In addition, there is no particular limit to the upper limit of the content of cycloalkanes with cyclic carbon atoms; it can be below 30 mmol / g, below 25 mmol / g, or below 15 mmol / g.

[0054] The content of cycloalkane ring carbon atoms can be calculated based on the molecular structure of the spontaneously heating inhibitor and the number of cycloalkane ring carbon atoms in one molecule. Specifically, the molecular weight can be determined from the molecular structure, and the content of cycloalkane ring carbon atoms can be calculated based on the molecular weight and the number of cycloalkane ring carbon atoms in one molecule.

[0055] When the molecular structure of a candidate substance for a spontaneous fever inhibitor is unknown, the average molecular structure can be determined through the following steps. The average molecular structure may not be consistent with the actual molecular structure of the candidate substance, but it reflects the characteristics of the candidate substance's molecular structure (type and number of functional groups, etc.).

[0056] Specifically, the content (mass %) of each element is determined, and the average molecular structure is calculated.

[0057] The content of each element was determined by elemental analysis of the natural fever inhibitor according to the method of JIS M 8813:2006.

[0058] Average molecular structure through 1 H NMR measurements and 13 It is determined by C NMR measurement.

[0059] Depend on 1 The results of H NMR measurements can determine the proportions of the four types of H: Ha, Hα, Hβ, and Hγ. The proportion of H present refers to the ratio of each of Ha, Hα, Hβ, or Hγ relative to the total H contained in the spontaneous pyrogenic inhibitor.

[0060] 4 types of H in 1 The 1H NMR spectrum shows chemical shift values ​​in the range of Ha: 9.0-6.0 ppm, Hα: 5.0-2.0 ppm, Hβ: 2.0-1.05 ppm, and Hγ: 1.05-0.5 ppm, thus allowing for the identification of these H atoms.

[0061] In addition, by 13 The results of C NMR measurements can reveal the number of aromatic carbons and the number of oxygen-containing groups such as aldehyde, ketone, and carboxyl groups.

[0062] Based on these NMR measurements, the average molecular structure was constructed. The specific method for constructing the average molecular structure was as described in Yuki Hata, et al., ISIJ International, Vol.62(2022), No.5, pp.948-95.

[0063] The specific NMR measurement conditions are as follows.

[0064] Deuterated solvents such as deuterated chloroform are used as solvents. 1 The H NMR spectrum was determined using the single-pulse method. 13 In the C NMR spectrum, the single-pulse method was used for determination, without using the NOE (nuclear Overhaus effect).

[0065] As described above, based on the average molecular structure determined by NMR, the molecular weight is further determined by mass spectrometry or GPC (gel permeation chromatography). Then, based on the obtained molecular weight and the number of cycloalkane ring carbon atoms in the average molecular structure, the content of cycloalkane ring carbon atoms is calculated.

[0066] The spontaneously heating inhibitor in this embodiment is a compound or a mixture. More preferably, the spontaneously heating inhibitor is a mixture. The mixture consists of two or more different compounds. The average molecular structure of such a mixture is determined using the method described above, and the content of cycloalkane ring carbon atoms in the average molecular structure is calculated.

[0067] When the spontaneously heating inhibitor is a mixture and the molecular structure of each compound in the mixture can be determined, the content of cycloalkane ring carbon atoms in the mixture can be calculated by summing the cycloalkane ring carbon atoms contained in each compound. Alternatively, when the spontaneously heating inhibitor is a single compound, it is sufficient to calculate the content of cycloalkane ring carbon atoms contained in the molecular structure of that compound.

[0068] When natural fever suppressants are made from natural resources, their raw materials and processing steps often result in mixtures of various compounds. In cases where a natural fever suppressant is a mixture of multiple compounds, the number of compounds constituting the mixture can reach tens of thousands, making identification difficult. However, it is known that the molecular weight distribution of the mixture ranges from 200 to 10,000. As the natural fever suppressant of this embodiment, by being composed of a mixture with molecular weights of 200 to 1000, a higher suppressive effect can be obtained.

[0069] Naturally occurring fever inhibitors are composed of a mixture of molecules with molecular weights of 200 to 1000, meaning that the peak molecular weight measured using an FD-MS instrument is in the range of 200 to 1000.

[0070] Specifically, the molecular weight peaks were determined as follows.

[0071] Molecular weight was determined using FD-MS, and the molecular weight peak was measured. Specifically, 1 mg of the sample was dissolved in tetrahydrofuran and coated onto the emitter (carbon whiskers were attached to the surface of a tungsten wire with a diameter of approximately 10 μm). Under high vacuum, the sample molecules were directly soft-ionized by adjusting the current applied to the emitter in conjunction with a high electric field, and the mass spectrum was obtained using a mass spectrometer. The detector voltage was set to 2200 V, the measurement mass range was 50–1600 m / z, and drift correction was performed using C0. 20 H 16 The mass number (252.09396) is used.

[0072] Furthermore, the spontaneously exothermic inhibitor of this embodiment may also have a fused ring structure within its molecular structure, which contains cycloalkane ring carbon atoms. The cycloalkane ring carbon atoms contained in the fused ring structure sometimes have high hydrogen-donating capacity.

[0073] The following shows examples of fused-ring structures contained in the compounds constituting the spontaneous pyrogenic inhibitors of this embodiment. It should be noted that the structures illustrated below represent only a portion of the molecular structure, and the compounds constituting the spontaneous pyrogenic inhibitors are not limited to having the structures described below. That is, as part of the structure of the compounds of this embodiment, they contain the fused-ring structures described below.

[0074]

[0075] It should be noted that any of the carbon atoms constituting the above-mentioned fused ring structure can bond with carbon atoms or other functional groups to form compounds.

[0076] For example, the compound constituting the natural fever inhibitor of this embodiment can be an alicyclic compound having a cyclic aliphatic structure.

[0077] In addition, the natural fever inhibitor of this embodiment may have the structure formed by the cycloalkane ring fusion described in (a) to (d) above.

[0078] The carbon resource in this embodiment can be a solid at room temperature. This is because most compounds with cycloalkane rings are sublimable, and therefore can react efficiently with the carbon resource even in a solid state. Furthermore, since the spontaneous heating inhibitor in this embodiment, although solid, is viscous, it exhibits high adhesion to the solid carbon resource, resulting in high reaction efficiency.

[0079] The spontaneously heating inhibitor of this embodiment is more preferably a cycloalkane ring having unsaturated carbon bonds within the cycloalkane ring carbon atom. The presence of unsaturated carbon bonds in the cycloalkane ring enhances hydrogen donation capability.

[0080] The spontaneous heating inhibitor of this embodiment is more preferably an aromatic one, where the unsaturated carbon bond of the cycloalkane ring containing the cycloalkane ring carbon atom is aromatic. That is, the unsaturated carbon bond is more preferably an aromatic carbon bond. This improves hydrogen donation performance and stabilizes free radicals generated during oxidation.

[0081] <3. Manufacturing method of carbon resource natural heat inhibitor>

[0082] Next, the method for manufacturing the spontaneous heating inhibitor of carbon resources will be described. The inventors have discovered that the spontaneous heating inhibitor of carbon resources is a component contained in the carbon resource or its carbon distillation product. Therefore, the spontaneous heating inhibitor of carbon resources of this embodiment can be extracted from the carbon resource or its carbon distillation product through solvent fractionation.

[0083] Here, we will explain based on the premise that there are two carbon resources: carbon resources that are the raw materials for the natural heating inhibitor of carbon resources and carbon resources that should be used to inhibit natural heating. However, these two carbon resources can be the same carbon resources or different carbon resources.

[0084] First, prepare the raw materials. Here, the raw materials are carbon resources or the carbon distillation products of carbon resources. Carbon resources are resources containing carbon atoms, from which heat is obtained through combustion. Examples of carbon resources include petroleum, coal, and wood-based biochar. Wood-based biochar refers to biomass composed of wood. Carbon distillation products, for example, are charcoal obtained by the dry distillation of petroleum-based pitch, coal, and wood-based biochar, more specifically, coal tar.

[0085] Next, the carbon resource or its carbon distillation product is extracted with hexane (first step). Specifically, for example, the carbon resource or its carbon distillation product is thoroughly mixed with hexane and allowed to stand. Then, the liquid portion is recovered, and hexane is removed from the liquid portion. Thus, a spontaneous heating inhibitor of the first carbon resource is obtained. As shown in the examples, the spontaneous heating inhibitor of the first carbon resource has a sufficient spontaneous heating inhibition effect.

[0086] More specifically, the first process is carried out according to the following steps.

[0087] 1. Place 2g of the first carbon resource into a centrifuge tube.

[0088] 2. Add 50cc of hexane to the centrifuge tube from step 1 and apply ultrasonic vibration for 10 minutes.

[0089] 3. Place the centrifuge tube from step 2 into a centrifuge for solid-liquid separation.

[0090] 4. The supernatant obtained from step 3 is recovered and the extract (hexane-soluble component) is obtained by filtration.

[0091] 5. Repeat steps 2-4 twice for the extracted residue in the centrifuge tube after step 4 (a total of 3 times).

[0092] 6. The extract obtained from the operation up to step 5 above is fed into an evaporator to remove the solvent (hexane).

[0093] 7. The extract (hexane-soluble component) recovered from step 6, the extraction residue (hexane-insoluble component), and the extraction residue (hexane-insoluble component) on the filter paper recovered from step 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 component and the hexane-insoluble component.

[0094] The method for manufacturing the spontaneous heating inhibitor of the carbon resource can be terminated after obtaining the spontaneous heating inhibitor of the first carbon resource, or the following second step can be further 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 toluene is removed from the liquid portion. Thus, the spontaneous heating inhibitor of the second carbon resource is obtained. As shown in the examples, the spontaneous heating inhibitor of the second carbon resource has a sufficient spontaneous heating inhibition effect.

[0095] More specifically, the second process is carried out according to the following steps.

[0096] 8. Repeat steps 1 to 7 multiple times to obtain more than 2g of hexane-insoluble component, recover 2g of hexane-insoluble component, and place it in a centrifuge tube.

[0097] 9. Add 50cc of toluene to the centrifuge tube from step 8 and apply ultrasonic vibration for 10 minutes.

[0098] 10. Place the centrifuge tube from step 9 into a centrifuge for solid-liquid separation.

[0099] 11. The supernatant obtained from step 10 is recovered and the extract (toluene-soluble component) is obtained by filtration.

[0100] 12. For the extraction residue in the centrifuge tube after step 11, change the solvent from 50cc hexane to 50cc toluene, and repeat steps 2-4 twice (a total of 3 times).

[0101] 13. The extract obtained from the operation up to step 12 above is fed into an evaporator to remove the solvent (toluene).

[0102] 14. The extract (toluene-soluble component) recovered by operation 13, the extraction residue (toluene-insoluble component), and the extraction residue (toluene-insoluble component) on the filter paper recovered by operation up to 12 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 hexane-insoluble-toluene-soluble component and toluene-insoluble component.

[0103] It should be noted that the spontaneous heating inhibitors of the second carbon resource generally contain more cycloalkane cyclic carbon atoms than those of the first carbon resource. Therefore, the spontaneous heating inhibitors of the second carbon resource can more reliably suppress the spontaneous heating of carbon resources compared to those of the first carbon resource. This manufacturing method is a simple process involving solvent fractionation of the carbon resource or its carbon distillation products, thus enabling the low-cost production of spontaneous heating inhibitors of carbon resources without generating CO2 gas during manufacturing.

[0104] It should be noted that the spontaneous pyrogenic inhibitor of this embodiment only needs to contain cycloalkane cyclic carbon atoms at a ratio of 1 mmol / g or more. Therefore, substances with such molecular structures can also be directly manufactured through organic synthesis. The resulting substance also becomes the spontaneous pyrogenic inhibitor of this embodiment.

[0105] The components contained in the carbon distillation products are substances described on pages 479-526 of the "Handbook of Aromatics and Tar Industries, Third Edition (Japan Aromatics Industry Association)".

[0106] <4. Methods to suppress the natural heating of carbon resources>

[0107] In the method for suppressing the spontaneous heating of carbon resources according to this embodiment, a spontaneous heating inhibitor of carbon resources of this embodiment is added at least 1% by mass relative to the carbon resources. As shown in the example, by setting the mass ratio to 1% by mass or more, a sufficient spontaneous heating suppression effect can be obtained.

[0108] For the sake of uniform mixing, it is more preferable to add at least 3% by mass of a natural heat inhibitor relative to the carbon resources. Further preferably, it is more preferable to add at least 5% by mass. Additionally, there is no particular upper limit to the mass ratio; for example, it can be 30% by mass.

[0109] <5. Methods for storing carbon resources>

[0110] In this embodiment of the carbon resource storage method, a mixture obtained by suppressing the natural heating of carbon resources is stored. There are no particular restrictions on the storage atmosphere; it can be stored in the atmosphere.

[0111] <6. Use as a natural fever suppressant>

[0112] The invention also includes the use of a spontaneously heating inhibitor of carbon resources containing cycloalkane cyclic carbon atoms at a ratio of 1 mmol / g or higher as a spontaneously heating inhibitor.

[0113] The invention also includes the use of a spontaneous pyrophoresis inhibitor containing carbon resources with cycloalkane ring carbon atoms at a ratio of 5 mmol / g or higher as a spontaneous pyrophoresis inhibitor.

[0114] The natural heating inhibitor of this carbon resource can possess the features described in the above embodiments.

[0115] Example

[0116] (Example 1)

[0117] Next, an embodiment of this method will be described. In this embodiment, a woody biochar material derived from acacia plants was prepared as the carbon resource to suppress spontaneous heating. Woody biochar material derived from acacia plants has high spontaneous heating properties.

[0118] On the other hand, a spontaneous heating inhibitor for carbon resources was prepared through the following steps. First, petroleum-based asphalt (ASP) was prepared. Here, a commercially available petroleum-based asphalt was used. Next, following the steps described in the above embodiment, 2g of petroleum-based asphalt was extracted with 50cc of hexane (first step). The extraction was carried out under the conditions of a temperature of 25°C and a pressure of atmospheric pressure. Then, an additive (HS) was obtained as the residue after the hexane was evaporated. HS corresponds to the first spontaneous heating inhibitor for carbon resources described in the above embodiment.

[0119] Next, 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 additive (HI-TS). Additionally, an insoluble residue insoluble in hexane and toluene was used as additive (TI). HI-TS is equivalent to a spontaneous heating inhibitor of the second carbon resource described in the above embodiment. Furthermore, TI is an insoluble residue of ASP insoluble in toluene.

[0120] Next, the average molecular structures of HS, HI-TS, and TI were determined using the methods described above. Specifically, elemental analysis of HS, HI-TS, and TI was performed according to JIS M 8813 or JIS M 8819, and the mass percentage of each element was calculated. Then, the following procedures were implemented. 1 HNMR measurements and 13C10 NMR spectroscopy (using deuterated chloroform as solvent) was performed. Based on these results, the average molecular structure was constructed. The specific construction of the average molecular structure was performed according to Yuki Hata, et al., ISIJ International, Vol.62(2022), No.5, pp.948-95. The molecular weight was determined from the average molecular structure, and the content of cycloalkane ring carbon atoms was calculated based on the molecular weight and the number of cycloalkane ring carbon atoms in the average molecular structure.

[0121] The results are shown in Table 1. HS and HI-TS contain cycloalkane cyclic carbon atoms at a ratio of 1 mmol / g or more, and therefore correspond to the spontaneous pyrogenic inhibitors of the carbon resources described in the above embodiments.

[0122] [Table 1]

[0123]

[0124] Next, a spontaneous heating evaluation test was conducted. Samples were prepared as follows: a sample with only 1.00 g of carbon resource, a sample with 5% by mass (50 mg) of HS added to 0.95 g of carbon resource, a sample with 5% by mass (50 mg) of HI-TS added to an equal amount of carbon resource, and a sample with 5% by mass (50 mg) of TI added to an equal amount of carbon resource (comparative example).

[0125] Next, 1g of each sample was taken and filled into the sample cell of the self-heating evaluation device. The sample cell was then placed in the sample holding chamber, and the atmosphere inside the device was purged with nitrogen. The sample temperature was then raised to 130°C under nitrogen atmosphere. The sample temperature was measured using a thermocouple. Then, the atmosphere inside the device was switched from nitrogen to oxygen, and the test was started, measuring the temperature trajectory of the sample. The results are presented below. Figure 1 .

[0126] Figure 1 The horizontal axis represents the elapsed time (in minutes) since the start of the natural heating evaluation test, and the vertical axis represents the sample temperature.

[0127] Curve L1 represents the test results when the sample is only carbon resource, curve L2 represents the test results when 5% by mass of HS is added to the carbon resource, curve L3 represents the test results when 5% by mass of HI-TS is added to the carbon resource, and curve L4 represents the test results when 5% by mass of TI is added to the carbon resource.

[0128] As shown by curves L1 to L4, when the carbon resource spontaneous heating inhibitors HS or HI-TS described in the above embodiments are added to the carbon resource, a significant spontaneous heating inhibition effect can be obtained, such as a longer heating time up to any temperature or a lower heating temperature up to a certain period of time. In addition, the reproducibility is high. Especially when HI-TS is added, the effect is even greater.

[0129] (Example 2)

[0130] In this embodiment, the same experiment as in Example 1 was conducted to investigate the time to reach 200°C when the amount of natural fever inhibitor added was changed.

[0131] The carbon resource that becomes the target of natural heat generation is the aforementioned 10g of woody biochar material derived from Acacia plants, to which additives (HS), (HI-TS), and (TI) are added, such that the amount added is any one of 1%, 3%, and 5% by mass.

[0132] The above-described spontaneous heating evaluation test was performed on these samples. Then, 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 2.

[0133] As shown in Table 2, significant effects can be obtained by adding more than 1% by mass of the natural heating inhibitor of the carbon resource of this embodiment to the carbon resource.

[0134] [Table 2]

[0135]

[0136] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to these examples. Anyone with common knowledge in the art to which this invention pertains will obviously be able to conceive of various modifications or alterations within the scope of the technical concept described in the claims, and it should be understood that these also fall within the protection scope of this invention.

[0137] Industrial availability

[0138] According to the present invention, a carbon resource spontaneous emission inhibitor that can more reliably suppress the spontaneous emission of carbon resources can be provided. Furthermore, according to the present invention, a carbon resource spontaneous emission suppression method and a carbon resource storage method that can more reliably suppress the spontaneous emission of carbon resources can be provided. Therefore, the present invention is extremely useful in industry.

Claims

1. A natural heat inhibitor for carbon resources, characterized in that, It contains cycloalkanes with carbon atoms at a ratio of more than 1 mmol / g.

2. The natural heating inhibitor of carbon resources according to claim 1, characterized in that, It contains cycloalkanes with carbon atoms at a ratio of more than 5 mmol / g.

3. The natural heating inhibitor of carbon resources according to claim 1 or 2, characterized in that, The cycloalkane ring containing the carbon atoms of the cycloalkane ring has unsaturated carbon bonds.

4. The natural heating inhibitor of carbon resources according to claim 3, characterized in that, The unsaturated carbon bonds are aromatic carbon bonds.

5. The natural heating inhibitor of carbon resources according to any one of claims 1 to 4, characterized in that, It has a fused ring structure within its molecular structure, which contains cycloalkane ring carbon atoms.

6. The natural heating inhibitor of carbon resources according to any one of claims 1 to 5, characterized in that, It is composed of a mixture of molecules with a molecular weight of 200 to 1000.

7. The natural heating inhibitor of carbon resources according to any one of claims 1 to 6, characterized in that, It is a solid at room temperature.

8. The natural heating inhibitor of carbon resources according to any one of claims 1 to 7, characterized in that, It is a component contained in carbon resources or the dry distillation products of said carbon resources.

9. A method for suppressing the spontaneous heating of carbon resources, characterized in that, It includes the step of adding at least 1% by mass of the natural heating inhibitor of the carbon resource according to any one of claims 1 to 8 relative to the carbon resource.

10. A method for storing carbon resources, characterized in that, The mixture is stored using the natural heating suppression method for carbon resources as described in claim 9.

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