Organic matter recovery method

Abstract

To recover an organic material from materials (biomass) containing the organic material (for example, oil) suppressing the discharge amount of carbon while suppressing energy consumption.SOLUTION: In an organic material recovery method: liquefied NH3 being a compound which does not contain carbon becoming CO2 in oxydation (combustion) is used as a solvent; the solvent is supplied to and brought into contact with algae 21, and an oil 22 is dissolved in the solvent; NH3 is vaporized by pressure-reducing (heating) a mixed liquid 23 of the oil 22 and NH3, and the oil 22 is recovered; and the oil 22 is recovered from the algae 21 in a state where the carbon discharge amount can be suppressed by using liquefied NH3 as the solvent.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for recovering organic matter from a material containing organic matter (biomass). By law Regarding. [Background technology]

[0002] Technologies for recovering organic matter from biomass (materials containing useful organic matter) have been known for some time. For example, algae, which are biomass, are known to have the ability to produce a variety of organic matter. Algae cultivated in water produce a large amount of organic matter per unit area and contain a variety of organic matter, so they are used as biofuels, raw materials for chemical products, proteins, edible oils and fats, health supplements, pharmaceutical ingredients, antioxidant pigments, and more.

[0003] Techniques using organic solvents such as hexane have been proposed for extracting organic matter from organic-containing materials (biomass) such as algae (for example, Patent Document 1). The technique in Patent Document 1 involves drying and crushing the organic-containing material (biomass), and extracting the organic matter in the presence of an organic solvent such as hexane. For example, wet samples such as algae are dehydrated, dried, and crushed, and then contacted with an organic solvent such as hexane to extract the organic matter.

[0004] In the technology of Patent Document 1, it was necessary to dehydrate, dry, and crush algae in advance so that hydrophobic hexane could come into contact with the organic matter present inside and outside the cells of algae, etc. Therefore, in order to extract organic matter from a substance containing organic matter (biomass) using hexane at a high yield, energy is required to dehydrate, dry, and crush the substance containing organic matter (biomass), such as algae, which has resulted in a large amount of energy consumption required for recovering the organic matter.

[0005] Against this background, various methods for recovering organic matter using organic solvents have been investigated. For example, a technology has been proposed in which dimethyl ether is brought into contact with moist algae or the like to extract organic matter, and the dimethyl ether is evaporated under predetermined conditions to separate the dimethyl ether and recover the organic matter (Patent Document 2).

[0006] The technology in Patent Document 2 uses dimethyl ether, a solvent that is miscible with both water and oil, to extract organic matter from algae and other organisms without having to go through the process of drying and crushing the algae and other organisms.

[0007] However, the amount of water that dissolves in dimethyl ether is not large, at a maximum of about 8% by weight. Furthermore, dimethyl ether has a low ability to break down the chemical bonds (such as ester bonds and ether bonds) within cell walls that hinder the extraction of organic matter. This means that a large amount of dimethyl ether is required to extract organic matter, and this inevitably leads to increased energy consumption due to the increased compressor power required to recover the solvent.

[0008] In addition, the current situation is that the large-scale use of dimethyl ether, which contains carbon, poses a risk of increasing carbon dioxide emissions derived from fossil resources when the carbon derived from dimethyl ether remaining on treated samples is burned (oxidized) and disposed of, or when dimethyl ether remaining on organic matter is used as fuel, etc. Therefore, there is currently room for improvement in order to realize a decarbonized, carbon-neutral society. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2019-205453 [Patent Document 2] Patent No. 5328547 Summary of the Invention [Problem to be solved by the invention]

[0010] The present inventors have completed the present invention by focusing on the following circumstances.

[0011] That is, H2, for example, has been attracting attention as a fuel that reduces the amount of carbon dioxide emitted during oxidation (combustion). H2 uses NH3 as one of the carriers, and NH3 has also been used as a fuel that reduces the amount of carbon dioxide emitted during oxidation (combustion).

[0012] As NH3 does not contain carbon in its molecule, it is thought to be able to contribute to the realization of a decarbonized, carbon-neutral society as an energy carrier. Until now, NH3 has been used industrially for fertilizer and denitrification, but for large-scale use as fuel, it has been thought to be less economical than existing fossil fuels and to pose technical challenges in safely handling it in accordance with laws and regulations.

[0013] However, in recent years, with the development of distribution infrastructure aimed at realizing a carbon-neutral society, the distribution infrastructure for NH3 has been significantly improved, and the current situation is that an environment is being created for the large-scale use of NH3.

[0014] Given the circumstances described above, when producing organic matter (biofuel) from algae, we considered using a solvent that does not contain carbon in its molecule and that is gaseous at room temperature and pressure, and we have completed a method and device for recovering organic matter that can produce biofuel while suppressing carbon emissions.

[0015] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a method for recovering organic matter that can recover organic matter from a material containing organic matter (biomass) while suppressing energy consumption and carbon emissions.

[0016] In other words, An organic matter recovery device that can recover organic matter from organic matter-containing materials (biomass) while reducing energy consumption and carbon emissions. will be able to provide. [Means for solving the problem]

[0017] In order to achieve the above object, a method for recovering organic matter according to claim 1 of the present invention includes using a liquefied compound that is gaseous at room temperature and atmospheric pressure as a solvent, bringing the solvent into contact with a substance (biomass) containing organic matter, dissolving the organic matter of the substance (biomass) in the solvent, and recovering the organic matter from a mixture of the organic matter and the solvent, wherein the compound is Contains no carbon It is something The organic matter is an oil. It is characterized by:

[0018] In the present invention according to claim 1, Oils (organic substances) contacting a solvent with a substance (biomass) containing Oils (organic substances) and solvent mixture Oils (organic substances) It recovers the energy consumption and Oils (organic substances) can be recovered. Also, Compounds that do not contain carbon (compounds that contain heteroatoms, which are atoms other than hydrogen and carbon) As the liquefied product is used as a solvent, Oils (organic substances) This reduces carbon emissions when recovering the compound. Oils (organic substances) This eliminates the direct emission of carbon from compounds when extracting. Carbon-free compounds (heteroatom compounds) As the element, nitrogen, sulfur, phosphorus, etc. can be used.

[0019] This makes it possible to recover organic matter from organic-containing materials (biomass) while reducing energy consumption and carbon emissions, thereby contributing to the creation of a decarbonized, carbon-neutral society.

[0020] Examples of materials containing organic matter (biomass) include biomass containing water (algae, wood, grass, paper, waste, etc.) and dried biomass. Examples of organic matter include oils (fatty acids, wax esters, hydrocarbons, etc.). Other examples include organic matter used as biofuels, chemical raw materials, proteins, edible oils and fats, health supplements, pharmaceutical raw materials, antioxidant pigments, etc.

[0023] Also, Claim 2 The organic matter recovery method of the present invention relates to Claim 1 In the organic matter recovery method described in Oils (organic substances) The recovery of the substance is carried out by separating the substance from the mixture, and recovering the substance from the mixture. Oils (organic substances) The present invention is characterized by recovering the above.

[0024] Claim 2 In the present invention, a substance is separated from a mixed liquid, and the mixed liquid from which the substance has been separated is Oils (organic substances) will be collected.

[0025] Also, Claim 3 The organic matter recovery method of the present invention relates to Claim 2 In the method for recovering organic matter according to the present invention, Oils (organic substances) The mixed liquid is vaporized when the mixed liquid is recovered.

[0026] Claim 3 In the present invention, Oils (organic substances) The mixed liquid from which the compounds have been collected can be vaporized to obtain the gaseous compounds. It is also possible to obtain the compounds from the mixed liquid by membrane separation, for example by passing the mixed liquid through a separation membrane.

[0027] Also, Claim 4 The organic matter recovery method of the present invention relates to Claim 3 In the method for recovering organic matter according to the present invention, Oils (organic substances) When recovering the above, the mixed liquid is subjected to a reduced pressure or heating, or a reduced pressure and heating.

[0028] Claim 4 In the present invention, Oils (organic substances) The liquid mixture from which the liquefied product is recovered is decompressed or heated, or is decompressed and heated, thereby vaporizing the liquefied product.

[0029] Also, Claim 5 The organic matter recovery method of the present invention relates to Claim 3 or Claim 4 Described in In the organic matter recovery method of the above, the vaporized material is pressurized or cooled, or pressurized and cooled to form a liquefied material, and the liquefied material is used as the solvent.

[0030] Claim 5 In the present invention, the vaporized vapor (gaseous compound) is pressurized or cooled, or pressurized and cooled to liquefy the vaporized compound, and all or part of the liquefied compound is used as a solvent, thereby enabling the compound to be recycled. When part of the liquefied compound is used as a solvent, the remaining part can be used as, for example, a fuel or a reactant depending on the properties of the compound.

[0031] Also, Claim 6 The organic matter recovery method of the present invention relates to Claims 1 to 5 In the organic matter recovery method according to any one of the preceding claims, the solvent is NH3, and gaseous NH3 is pressurized or cooled, or pressurized and cooled to obtain liquid NH3 as the solvent, and the Oils (organic substances) The method is characterized in that the liquid NH3 is brought into contact with the substance containing

[0032] Claim 6 In the present invention, Oils (organic substances) contacting a substance (biomass: e.g., algae) containing NH3 as a solvent, Oils (organic substances) and NH3 mixture Oils (organic substances) By using a state change (gas-liquid phase change), energy consumption can be reduced and the Oils (organic substances) is recovered and carbon-free NH3 is used as the solvent, reducing carbon emissions.

[0033] NH3, used as a solvent, has high ability to break down bonds between components that inhibit extraction, to penetrate into the interior of cells, and to dissolve organic matter, so there is no need to dry or crush materials containing organic matter (e.g., oil).

[0034] Furthermore, NH3 as a solvent vaporizes at room temperature and pressure, has a high affinity for water (high dehydration properties make it easy to remove water), is easy to separate and recover, and can be used as fuel. This allows for simultaneous extraction and dehydration of organic matter (e.g., oil) containing materials. Even for materials with high water content, the processed samples are extremely easy to store and transport, making them suitable for use as fuel or animal feed.

[0035] Furthermore, NH3 used as a solvent does not contain metals or halogen elements, has a global warming potential and ozone depletion potential of zero, and emits zero CO2 when burned (also zero carbon dioxide emissions). Therefore, its use places a small burden on the environment, it can exist stably in the presence of water and air, and is an easily obtainable compound.

[0036] In addition to NH3, H2S can also be used as a solvent. It is also possible to use a mixture of NH3 and a compound (NH3 and methane, NH3 and hexane, NH3 and water, etc.). The polarity of the solvent can be adjusted by adding a compound to NH3. Adding a chloride such as sodium chloride can also make it easier to separate NH3 by salting it out (reducing the amount of NH3 remaining in the water).

[0037] The present invention An organic matter recovery apparatus for carrying out the organic matter recovery method includes: The apparatus comprises a storage container for storing a liquefied compound that is gaseous at room temperature and pressure and contains a heteroatom but no carbon; a storage container for storing a substance containing an organic substance; a liquid passing means for passing the liquefied compound stored in the storage container through the storage container; an extraction container for storing a mixed liquid in which the organic substance is dissolved by the liquid passing means contacting the liquefied compound as a solvent with the substance containing the organic substance; and a recovery means for recovering the organic substance from the mixed liquid stored in the extraction container. It is preferable that

[0038] This means:The liquefied material is passed through a storage container by a liquid passing means, and the solvent comes into contact with the organic-containing material (biomass). As the organic-containing material comes into contact as the solvent, a mixed liquid in which the organic material has been dissolved is stored in an extraction container. The organic material is then recovered (extracted) from the mixed liquid by a recovery means. Because a liquefied compound containing a heteroatom, which is an atom other than hydrogen or carbon, is used as the solvent, carbon emissions can be reduced. Examples of heteroatoms that can be used include nitrogen, sulfur, and phosphorus.

[0039] Therefore, there is no need to dry or crush the material (biomass), and the method of recovering organic matter utilizes the gas-liquid phase change of a carbon-free compound, making it possible to recover organic matter from organic-containing materials (biomass) while reducing energy consumption and carbon emissions, thereby contributing to the creation of a decarbonized, carbon-neutral society.

[0040] Also, In the organic matter recovery device, The recovery means is a means for reducing the pressure or heating the mixed liquid, or a means for reducing the pressure and heating the mixed liquid. is preferred.

[0041] This means: The mixed liquid from which the organic matter has been recovered (extracted) is decompressed or heated, or decompressed and heated, to vaporize the liquefied matter.

[0042] Also, In the organic matter recovery device, a re-liquefaction means for pressurizing or cooling, or pressurizing and cooling, the vaporized material in the recovery means to liquefy the material, and circulating the liquefied material to the storage container; It is preferable that

[0043] This means: The vaporized gas (gaseous compound) is pressurized or cooled, or pressurized and cooled, to form a liquefied compound, and all or part of the liquefied compound can be used as a solvent, allowing the compound to be recycled. When part of the liquefied compound is used as a solvent, the remaining part can be used as a fuel, a reactant, or the like, depending on the properties of the compound.

[0044] Also, In the organic matter recovery device, The solvent is NH3, and the storage container stores NH3 that has been liquidized by pressurizing and cooling gaseous NH3, and the liquid NH3 is brought into contact with a substance containing organic matter in the storage container. It is preferable.

[0045] This means: Gaseous NH3 is pressurized and cooled to become a liquid, which is stored in a storage container. The liquid NH3 is then brought into contact with a substance (biomass: for example, algae) containing organic matter (for example, oil) as a solvent, and the organic matter (for example, oil) is recovered (extracted) from the mixture of the organic matter (for example, oil) and NH3. This reduces energy consumption and allows the organic matter to be recovered, and because carbon-free NH3 is used as the solvent, carbon emissions are reduced.

[0046] Also, In the organic matter recovery device, The solvent is NH3, and the storage container stores NH3, which is obtained by compressing gaseous NH3 to make it liquid, as the solvent. In the storage container, the liquid NH3 is brought into contact with a substance containing an organic substance. is preferred.

[0047] This means: Gaseous NH3 is pressurized to become a liquid and stored in a storage container. The liquid NH3 is then brought into contact with a substance (biomass: for example, algae) containing organic matter (for example, oil) as a solvent, and the organic matter (for example, oil) is recovered (extracted) from the mixture of the organic matter (for example, oil) and NH3. This reduces energy consumption and allows the organic matter to be recovered, and because carbon-free NH3 is used as the solvent, carbon emissions are reduced.

[0048] Also, In the organic matter recovery device, The solvent is NH3, and the storage container stores NH3 obtained by cooling gaseous NH3 to form a liquid, and the liquid NH3 is brought into contact with a substance containing an organic substance. is preferred.

[0049] This means:Gaseous NH3 is cooled to become a liquid and stored in a storage container. The liquid NH3 is then brought into contact with a substance (biomass: for example, algae) containing organic matter (for example, oil) as a solvent, and the organic matter (for example, oil) is recovered (extracted) from the mixture of the organic matter (for example, oil) and NH3. This reduces energy consumption and allows the organic matter to be recovered, and because carbon-free NH3 is used as the solvent, carbon emissions are reduced. [Effects of the Invention]

[0050] The organic matter recovery method of the present invention makes it possible to recover organic matter from organic matter-containing materials (biomass) while suppressing energy consumption and carbon emissions.

[0051] Also, the above The organic matter recovery device makes it possible to recover organic matter from materials containing organic matter (biomass) while suppressing energy consumption and carbon emissions.

[0052] This will make it possible to recover organic matter from materials containing organic matter (biomass) while reducing energy consumption and carbon emissions, thereby contributing to the realization of a carbon-free, carbon-neutral society. [Brief explanation of the drawings]

[0053] [Figure 1] 1 is a schematic diagram of an organic matter recovery apparatus for carrying out an organic matter recovery method according to an embodiment of the present invention; [Figure 2] 1 is a schematic process diagram illustrating the concept of the organic matter recovery method of the present invention. FIG. [Figure 3] 1 is a graph showing the relationship between the oil extraction rate and the amount of NH3. [Figure 4] FIG. 1 is a conceptual diagram of a chromatogram illustrating the composition of the extracted oil. DETAILED DESCRIPTION OF THE INVENTION

[0054] The present inventors investigated the use of a liquefied compound that does not contain carbon in its molecule as a solvent when producing biofuel from algae, and completed the invention based on the finding that biofuel can be produced in a manner that reduces carbon emissions.

[0055] The organic matter recovery method of the present invention involves contacting a substance (biomass: for example, algae) containing organic matter (e.g., oil) with a solvent (e.g., NH3), which is a liquefied compound containing atoms derived from heteroatoms, dissolving the water and oil contained in the algae in NH3, recovering a mixture of the water and oil and NH3, separating the algae from the mixture, vaporizing the NH3 from the mixture from which the algae has been separated, and separating and recovering the oil from the mixture from which the NH3 has vaporized.

[0056] This allows oil to be extracted from oil-containing algae with reduced energy consumption, without using energy for drying or crushing, etc. Furthermore, the use of NH3, a liquefied compound containing atoms derived from heteroatoms other than hydrogen and carbon, as a solvent reduces carbon emissions.

[0057] As the compound containing atoms derived from heteroatoms, compounds of sulfur, phosphorus, etc. can be used.

[0058] Examples of materials containing organic matter (biomass) include biomass containing water (algae, wood, grass, paper, waste, etc.) and dried biomass. Examples of organic matter include oils (fatty acids, wax esters, hydrocarbons, etc.). Examples of organic matter that can be used include biofuels, raw materials for chemical products, proteins, edible oils and fats, dietary supplements, raw materials for pharmaceuticals, antioxidant pigments, etc.

[0059] An embodiment of the organic matter recovery device and recovery method of the present invention will be described with reference to the drawings.

[0060] FIG. 1 shows a schematic configuration of an organic matter recovery apparatus for carrying out an organic matter recovery method according to one embodiment of the present invention, and FIG. 2 shows a schematic process for explaining the concept of the organic matter recovery method.

[0061] An organic matter recovery device according to one embodiment of the present invention will be described with reference to FIG.

[0062] The organic matter recovery device 1 is provided with a storage container 2 for storing liquefied NH3 (liquefied NH3). That is, the storage container 2 is provided for storing NH3, which is a compound that is gaseous at room temperature and pressure and contains heteroatoms but does not contain carbon, in a liquefied state (liquefied product).

[0063] Liquefied NH3 is supplied to the storage container 2 via an inlet 3. A liquid passage 4 is provided from the storage container 2, and the liquid passage 4 is connected to an inlet 5a of a storage container 5. The storage container 5 stores algae 21, which is a substance (biomass) containing organic matter (oil). A pump 6 is provided in the liquid passage 4, and when the pump 6 is driven, the liquefied NH3 stored in the storage container 2 is passed through the liquid passage 4 to the storage container 5 (liquid passing means).

[0064] As a liquid-passing means for passing the liquefied NH3 stored in the storage container 2 through the liquid passage 4 to the storage container 5, it is possible to use a means for pressure-feeding N2 gas into the storage container 2 and passing the liquefied NH3 through the liquid passage 4 to the storage container 5, instead of the pump 6. By using a means for pressure-feeding N2 gas as the liquid-passing means, it becomes possible to use N2 gas as a purge gas in the recovery device 1 without using special equipment when the recovery device 1 is opened (when the recovery device 1 is opened for maintenance), etc.

[0065] Buffer members 5c for stabilizing the stored algae 21 are disposed at the inlet 5a and outlet 5b of the storage container 5. When liquefied NH3 is passed through the storage container 5, the liquefied NH3 comes into contact with the algae 21 as a solvent, and a mixed liquid 23 is formed in which oil 22 is dissolved. The mixed liquid 23 is sent from the outlet 5b of the storage container 5 through the liquid passage 7 to the extract container 8 and stored therein (liquid passage means).

[0066] The NH3 contained in the mixed liquid 23 sent to the extraction container 8 is vaporized and removed by reducing the pressure (and / or heating) of the extraction container 8 (recovery means). Note that by reducing the pressure (and / or heating) of the storage container 5, the NH3 contained in the algae 21 (solid portion) in the storage container 5 after the liquefied NH3 has passed through can be vaporized and removed (recovery means).

[0067] The extraction vessel 8 is decompressed (and / or heated) to vaporize and remove the NH3, thereby recovering oil 22 from the mixed liquid 23. The vaporized and removed NH3 (vaporized NH3) is collected and sent to a utilization means via a recovery line 9. Depending on the properties of the compound, it may be used as, for example, a fuel or a reactant.

[0068] The NH3 vaporized and removed by reducing the pressure (and / or heating) in the storage vessel 5, and the NH3 vaporized and removed by reducing the pressure (and / or heating) in the extraction vessel 8 are collected through a filter such as a gas-liquid separation filter or a foreign matter removal filter, and are used by a utilization means.

[0069] A re-liquefaction path 10 branches off from the recovery path 9 and connects it, where all or part of the vaporized and removed NH3 is pressurized (and / or cooled) to be liquefied, and circulated from the inlet path 3 to the storage container 2 (re-liquefaction means).

[0070] In the organic matter recovery device 1 configured as described above, liquefied NH3 is passed as a solvent through the storage container 5 by the liquid passing means, and the liquefied NH3 comes into contact with the algae 21 as a solvent. When the liquefied NH3 comes into contact with the algae 21 containing the oil 22 as a solvent, a mixed liquid 23 in which the oil 22 is dissolved is stored in the extract container 8.

[0071] Then, the extraction vessel 8 is decompressed (and / or heated) to vaporize and remove NH3 from the mixed liquid 23, and the oil 22 is recovered from the mixed liquid 23 (see the lower right part of FIG. 1).

[0072] Therefore, since a liquefied compound containing a heteroatom, which is an atom other than hydrogen and carbon, namely liquid NH3 (liquefied NH3), is used as the solvent, carbon emissions can be reduced.

[0073] The recovery operation (recovery method) in the organic matter recovery device 1 having the above configuration will be described with reference to Fig. 2. For convenience of explanation, the situation in Fig. 2 shows the operation conceptually, and there are some differences from the actual state of the device.

[0074] As shown in Fig. 2(a), algae 21 are stored in a storage vessel 5. As shown in Fig. 2(b), liquefied NH3 is sent to the storage vessel 5 (for example, operating pressure: 0.85 MPa: 20°C). That is, liquefied NH3 is supplied by driving the pump 6 shown in Fig. 1, and the liquefied NH3 is impregnated into the algae 21.

[0075] As shown in Figure 2(c), the inlet valve of the storage vessel 5 is closed, and liquefied NH3 is brought into contact with the algae 21 as a solvent to extract oil 22. As shown in Figure 2(d), the outlet valve of the storage vessel 5 and the inlet valve of the extraction vessel 8 are opened, and the mixture 23 in which the oil 22 has been dissolved is sent to and stored in the extraction vessel 8 (subjected to solid-liquid separation).

[0076] As shown in Figure 2(e), the storage vessel 5 and the extraction vessel 8 are separated, and the inlet valves of each are opened to reduce the pressure (and / or heat). By reducing the pressure (and / or heating) in the storage vessel 5 and the extraction vessel 8, the NH3 in the solid portion of the mixed liquid 23 and the algae 21 is vaporized and removed. Then, the mixed liquid 23 from which the NH3 has been vaporized and removed, i.e., the oil 22, remains in the extraction vessel 8, and the oil 22 is recovered from the mixed liquid 23.

[0077] All or part of the vaporized and removed NH3 is pressurized (and / or cooled) to be liquefied and circulated to the storage vessel 5 (storage vessel 2: see Figure 1) (re-liquefaction means). Depending on the properties of the compound, the vaporized and removed NH3 can be used as a fuel, a reactant, or the like.

[0078] As described above, by contacting liquefied NH3 as a solvent with algae 21 containing organic oil 22 and recovering the oil 22 from a mixture 23 of the oil 22 and NH3, the oil 22 can be recovered without drying or crushing the algae 21, thereby reducing energy consumption and recovering the oil 22. Furthermore, because NH3, which does not contain carbon, is used as the solvent, carbon emissions can be reduced.

[0079] The NH3 solvent used has high decomposition properties between components that prevent extraction, high permeability to the interior of cells, and high solubility of organic matter. This allows the extraction of organic matter from algae 21 containing organic oil 22 without the need for dehydration, drying, or crushing.

[0080] In addition, NH3, which is used as a solvent, vaporizes at room temperature and pressure and has a high affinity with water (it is highly dehydratable and easy to remove water), making it easy to separate and recover, and even if any remains, it can be used as fuel.

[0081] This allows the extraction of oil 22 from algae 21 containing organic oil 22 and the dehydration of the algae 21 to be carried out simultaneously at room temperature. Therefore, even if algae 21, which is a substance with a high water content, is used, the treated sample is extremely easy to handle, such as for storage and transportation, and can be easily used as fuel, feed, etc.

[0082] It is also possible to heat the mixture in order to promote decomposition (chemical reaction) of the bonds between the constituent components.

[0083] Furthermore, NH3 used as a solvent does not contain metals or halogen elements, has a global warming potential and ozone depletion potential of zero, and emits zero CO2 when burned. Therefore, its use places a small burden on the environment, it can exist stably in the presence of water and air, and it is an easily obtainable compound.

[0084] In addition to NH3, H2S can also be used as a solvent. It is also possible to use a mixture of NH3 and a compound (NH3 and methane, NH3 and hexane, NH3 and water, etc.). In addition, adding a compound to NH3 makes it possible to adjust the polarity of the solvent. Furthermore, adding a chloride such as sodium chloride makes it easier to separate NH3 by salting out (reducing the amount of NH3 remaining in the water).

[0085] An example of the state of the recovered oil 22 will be described with reference to FIGS.

[0086] Figure 3 shows a graph showing the relationship between the amount of NH3 and the extraction rate (%) of oil 22, and Figure 4 shows a conceptual diagram of the chromatographic results showing the amount of specific components contained in oil extracted with liquefied NH3, compared with oil extracted with standard reagents and a comparative method.

[0087] As shown in Figure 3, when the amount of NH3 is increased to Y (g) relative to the amount of algae 21, the extraction rate of oil 22 increases to X (%), and when the amount of NH3 exceeds Y (g), the extraction rate of oil 22 remains at approximately X (%). Therefore, by using the amount of NH3 up to a predetermined value of Y (g), it is possible to recover oil 22 at a desired extraction rate of X (%).

[0088] As shown in Figure 4, the chromatographic results of Oil 22 (NH3 extract) (shown by the solid line) show that the components contained in Oil 22 (NH3 extract) match the chromatographic results of the standard reagent (standard reagent) (shown by the dashed dotted line), for example, in the retention times (min) of the peaks (1), (2), (3), (4), and (5). This indicates that Oil 22 (NH3 extract) has been extracted, which contains components similar to those contained in the standard reagent, which is oil in the desired state.

[0089] Furthermore, the chromatographic results of Oil 22 (NH3 extract) (shown by the solid line) indicate that the components contained in Oil 22 (NH3 extract) are identical to those of the oil extracted using drying and grinding (comparative example) in terms of the retention times (min) of the peaks (1), (2), (3), and (5). This indicates that Oil 22 (NH3 extract) contains components similar to those contained in the oil extracted using drying and grinding (comparative example).

[0090] As described above, by bringing liquefied NH3 into contact with algae 21 containing oil 22 and recovering the oil 22 from a mixture 23 of oil 22 and NH3, the oil 22 can be recovered without drying or crushing the algae 21, thereby reducing energy consumption and recovering the oil 22. Furthermore, because NH3 used as a solvent is a liquefied compound containing N, an atom derived from a heteroatom other than hydrogen and carbon, carbon emissions can be reduced.

[0091] Therefore, it becomes possible to recover oil 22 from algae 21 while reducing energy consumption and carbon emissions, and it becomes possible to recover oil 22 while contributing to the creation of a decarbonized, carbon-neutral society. [Industrial Applicability]

[0092] The present invention can be used in industrial fields relating to organic matter recovery methods and organic matter recovery devices. [Explanation of symbols]

[0093] 1. Recovery device 2. Storage container 3 Inflow channel 4, 7 Liquid passage 5. Storage container 6. Pump 8 Extract container 9 Recovery Route 10 Reliquefaction path 21 Algae 22 Oil 23 Mixed liquid

Claims

1. a liquefied compound that is a gas at room temperature and pressure is used as a solvent, and the solvent is brought into contact with a substance containing an organic substance; Dissolving the organic matter of the substance in the solvent; In the organic matter recovery method, the organic matter is recovered from the mixed liquid of the organic matter and the solvent, the compound does not contain carbon; The organic matter is an oil. A method for recovering organic matter.

2. The organic matter recovery method according to claim 1, The recovery of the oils is The substance is separated from the mixed liquid, and the oil is recovered from the mixed liquid from which the substance has been separated. A method for recovering organic matter.

3. In the organic matter recovery method according to claim 2, When recovering the oils from the mixed liquid, the mixed liquid is vaporized. A method for recovering organic matter.

4. In the organic matter recovery method according to claim 3, When recovering the oils from the mixed liquid, The mixture is subjected to a pressure reduction or heating, or a pressure reduction and heating. A method for recovering organic matter.

5. In the method for recovering organic matter according to claim 3 or claim 4, The vaporized product is pressurized or cooled, or pressurized and cooled to form a liquefied product, and the liquefied product is used as the solvent. A method for recovering organic matter.

6. The organic matter recovery method according to any one of claims 1 to 5, The solvent is NH ３ and Gaseous NH ３ is pressurized or cooled, or pressurized and cooled to obtain liquid NH ３ to obtain the solvent, and add the liquid NH ３ to contact A method for recovering organic matter.

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