JP2006232572A - Apparatus for forming fine particle of chemically combined explosive, apparatus for manufacturing chemically combined fine particle explosive, and method for manufacturing chemicaly combined fine particle explosive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the controlling of the particle shape and the particle size of a chemically combined fine particle explosive when performing the recrystallization of the chemically combined explosive using a supercritical CO<SB>2</SB>. <P>SOLUTION: There are provided a first conduit that introduces a solution of the chemically combined explosive being dissolved in an organic solvent, and a second conduit that is arranged coaxially with the first conduit and so as to surround the first conduit and that introduces the supercritical CO<SB>2</SB>, wherein the exit end of the second conduit is longer than the exit end of the first conduit by 5 mm or more, whereby the second conduit forms a single flow channel for performing the recrystallization of the chemically combined explosive by contacting the supercritical CO<SB>2</SB>with the solution. In the single flow channel the second conduit has the same inner diameter and a length of 5-200 mm. When the pressure within the second conduit reaches to a given pressure during introducing the supercritical CO<SB>2</SB>into the second conduit, the solution is introduced into the first conduit and in the single flow channel the recrystallization to the chemically combined fine particle explosive having a spherical shape is occurred by contacting the supercritical CO<SB>2</SB>with the solution, and the recrystallized chemically combined fine particle explosive is recovered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a fine particle generating apparatus for dry particulate compound explosives having a specific shape, an apparatus for producing particulate compound explosives, and a method for producing particulate compound explosives, and more specifically, contacting a solution of supercritical carbon dioxide and compound explosives. The present invention relates to a fine particle generating apparatus for finely divided compound explosives that recrystallizes into a spherical body, a fine particle compounded explosives manufacturing apparatus, and a method for manufacturing finely divided compound explosives.

Chemical explosives are desired to have high power and low sensitivity.
According to "Explosives and Blasting" (Sudo Hideharu, Okubo Shohachiro, Tanaka Ichizo, Ohmsha, pp19-), in evaluating the power of chemical explosives, such as dynamic effects, the detonation pressure P is the detonation speed (Explosion speed) It can be approximated as P = (1/4) ρ ₀ D ² using D and the packing density ρ ₀ of compound explosives. From the theory of detonation, if the detonation pressure is affected by the packing density of chemical explosives, and if the filling density can be increased within the range where no dead pressure phenomenon occurs when filling chemical explosives, chemical explosives You can improve the power of the kind.

According to "Powder Theory and Application" (Kuichiro Teruichiro, Eiji Mizuwatari, Yuzo Nakagawa, Sohachiro Hayakawa, Maruzen Co., Ltd., pp208 ~) In particular, when the particle shape departs from the sphere and becomes an irregular shape such as a rod shape or a plate shape, the apparent specific volume of the powder increases, and the apparent density calculated as the reciprocal of the apparent specific volume decreases.
Therefore, in order to pack compound explosives at high density, if compound explosives of large and small particle sizes are mixed and filled, small particles are clogged in the gaps between large particles, thus filling with high density. At that time, by using compound powders having a spherical particle shape, the particles can be filled at a higher density.

  In recent years, it has been desired to eliminate as much as possible the danger when handling compound explosives, and this danger can be eliminated by making the particle shape spherical. In other words, by making the particle shape of compound powder fine particles spherical with a rounded corner, not only can the packing density be improved and the combustion characteristics can be improved, but in recent years there has been a demand for reducing the handling sensitivity of compound powders. Can also respond.

  Conventionally, fine powder by mechanical pulverization has been performed in the preparation of compound explosive fine particles (see, for example, Non-Patent Document 1). When mechanically pulverizing in large quantities, there is a high risk of ignition and explosion, and there is also re-adhesion due to agglomeration of the pulverized crystals, so a fine particle powder with an average particle size of 5 μm or less is costly and effective. Judging from this aspect, it was not realistic. Furthermore, fine particle powder by mechanical pulverization has an irregular crystal form, and strain energy is interposed inside the angular crystal, so that the handling sensitivity tends to be sharp, and the tendency to desensitize in recent years. In addition to the current trend of explosives, the particle size distribution tends to be broad.

Therefore, a chemical treatment method in which compound explosives are dissolved in an organic solvent and precipitated in a poor solvent such as water has been studied.
Dissolve the starting component in a solvent that can dissolve the component, then stir the solution, supply the ejector, evaporate the solvent and water vapor supplied to the ejector in the diffuser, and dissolve in the solvent A method for producing a micronized crystalline explosive material is disclosed in which the explosive component is crystallized or precipitated, and then the crystal component is separated from the solvent in a cyclone, and the solvent is condensed and reused (for example, patent document) 1).

  Further, the explosive composition raw material, which is a starting component, is dissolved or suspended in an organic solvent, and sprayed in a mist using an inert gas or the like, and at least heating and decompression are performed while the spray liquid passes through the chamber. Disclosed is a method and apparatus for producing a powdered explosive composition in which 40% to 90% of an organic solvent is distilled off from an explosive composition raw material by performing one, and then the powdered explosive composition is brought into contact with an insoluble poor solvent. (For example, refer to Patent Document 2).

  In addition, the explosive composition raw material (for example, trimethylenetrinitramine) is mixed with a good solvent (for example, methyl ethyl ketone), and one or more crystalline explosives are dissolved in the good solvent by 20 to 98 wt%, and other components are completely dissolved. Disclosed is a method for producing a powdered explosive composition in which an explosive composition raw material is precipitated by contacting a suspension in a solid-liquid coexisting state dissolved in a powder with a poor solvent (eg, water) in which the explosive composition raw material is insoluble (For example, see Patent Document 3).

In these conventional techniques, a good solvent is taken into the crystal after recrystallization and voids may be generated, and there is a problem that handling sensitivity becomes sharp and power is lowered.
In addition, complicated steps such as filtration, washing, and drying steps are required after recrystallization from the viewpoint of the manufacturing method, and as these steps pass, the effects on the quality such as the particle shape and particle size of chemical explosives fine particles are also affected. It becomes a problem.

Furthermore, since a large amount of waste liquid (for example, water containing an organic solvent) is produced at the time of manufacture, not only does it require a lot of labor to process the waste liquid, but it is not suitable for the trend of organic solvent reduction from the viewpoint of environmental problems in recent years. However, these methods have a problem that it is difficult to control to a desired particle shape and particle diameter because of slow deposition and growth of crystals.
In view of the above problems, in recent years, methods for producing fine powders of chemical explosives using supercritical carbon dioxide have been studied. Since carbon dioxide is an inert gas, it is possible to produce compound powders of chemical explosives in an inert atmosphere, and eliminate the risk of ignition and explosion when producing fine particle powders such as mechanical grinding. Can do. Carbon dioxide is non-toxic and can be easily vaporized if reduced in pressure, and can be separated, recovered, and recycled, which not only reduces the burden on the environment, but also reduces the waste generated during production. In addition, the labor required for waste disposal can be reduced.

Therefore, RDX is dissolved in an organic solvent of acetone or cyclohexanone, and an appropriate amount of a gas component composed of carbon dioxide that is soluble in the solvent and insoluble in RDX is added so that the solvent approaches, reaches, or exceeds the supersaturated state. Thus, a fine particle powder manufacturing method for recrystallizing RDX is disclosed (for example, see Patent Documents 4 to 5).
These fine particle powder manufacturing methods are carried out by GAS (Gas Anti-Solvent) method, which eliminates voids in the crystal generated by the conventional recrystallization method and eliminates impurities in crystalline explosives. However, there is a problem that it is difficult to control the particle shape and the particle size because the management of the addition rate and the holding time for adding carbon dioxide to a desired pressure is complicated.

In addition, a method for producing fine powders of chemical explosives using a rapid expansion of supercritical solutions (RESS) method in which chemical explosives are dissolved in supercritical carbon dioxide and sprayed through a spray nozzle has been reported (for example, non-patented). Reference 2).
However, the RESS method is a fine particle powder manufacturing method that is difficult to apply unless the chemical explosives are dissolved in supercritical carbon dioxide. The reported chemical explosives such as TNT crystals are needle-like. There is a problem of increased sensitivity to impact and friction, and in the production of fine powdered pyrotechnics, the fine particle powder dries at the same time as spraying, and there is a risk of dust explosion.

  Non-Patent Document 2 discloses a PCA (a recrystallization of compound explosives by injecting a solution of compound explosives dissolved in an organic solvent in a supercritical carbon dioxide atmosphere in a high-pressure vessel through an injection nozzle. A method for producing fine powders of chemical explosives by the Precipitation with a Compressed Fluid Antisolvent method has also been reported. However, reported chemical explosives, for example, RDX crystals, have a plate-like shape with a clear edge, and there is a problem that sensitivity to impact and friction increases.

The method for producing fine powder of chemical explosives using supercritical carbon dioxide includes the same problems as the conventional method for producing fine powder of chemical explosives, such as difficulty in controlling the desired particle shape and particle size. Therefore, it is difficult to eliminate the danger during handling of the compound powder fine particles obtained in this way.
In contrast, means for controlling the temperature and pressure in the particle formation vessel, and a solution or suspension in which at least one substance is dissolved or suspended in the particle formation vessel or a supercritical fluid An apparatus for forming a granular product comprising: a first passage for introducing a supercritical fluid; and a solution or suspension. And a relative arrangement of the first passage and the second passage and their respective outlets is introduced from the first passage and the supercritical fluid introduced from the first passage in use. Both the solution or suspension flow into the particle formation vessel at the same point, which is substantially the same as the point where the supercritical fluid and the solution or suspension contact, and the supercritical fluid flow Critical fluid and solution or suspension Disclosed is a particle generation device arranged to disperse a solution or suspension at a point where it comes into contact with a liquid and flows into a particle formation container, and a particle generation method using this device (for example, And Patent Document 6).

The particle generation method is called SEDS (Solution Enhanced Dispersion by Supercritical fluids) method, and the means for simultaneously introducing the supercritical fluid and the solution into the particle generation container is a coaxial passage composed of a first passage and a second passage. Characterized in that a coaxial nozzle is used, each passage having its ends adjacent to each other at the outlet end.
The coaxial nozzle is a means for dispersing the solution in the particle generation container by the flow of the supercritical fluid. At the same time as the dispersion of the vehicle in the container, the vehicle is extracted into the supercritical fluid and the particles of the substance in the solution are extracted. Precipitate.

However, the outlet ends of the first passage and the second passage forming the coaxial flow path only define a qualitative relative position such as an arrangement adjacent to each other, and the relative position is not quantified. Furthermore, in the process of precipitating particles from the fine droplets of the solution dispersed in the particle formation container by the supercritical fluid, the droplets dispersed in the container aggregate each other, and the vehicle is extracted into the supercritical fluid. There is a problem that it is difficult to control the particle shape to a desired shape due to crystal growth of the particles dispersed and deposited in the container in an insufficient state.
JP-A-1-313382 JP 2002-179490 A JP 2002-179491 A US Pat. No. 5,360,478 US Pat. No. 5,389,263 JP 2004-105953 A U. Teipel, I. Mikonsaari, “Size reduction of particulate energetic material”, PEP, 27, 168-174 (2002). U. Teipel, H. Kraber, and H. Krause, “Formation of Energetic Materials Using Supercritical fluids”, PEP, 26, 168-173 (2001).

The conventional method for producing fine powders of chemical explosives involves the risk of ignition and explosion during mechanical pulverization, and the recrystallization method generates a large amount of waste liquid after production. Cost.
In addition, the method for producing fine particle powder using supercritical carbon dioxide makes use of the feature that carbon dioxide is an inert gas, and can eliminate the risk of ignition and explosion during production. Although it is a good method that can reduce the amount of substances, it has been difficult to control the particle shape and particle size of the compound powder fine particles.

  The present invention has been made in view of such conventional problems, and the object thereof is to form the particle shape and particle diameter of the chemical explosive fine particles when recrystallizing the chemical explosives using supercritical carbon dioxide. It is an object of the present invention to provide a fine particle generating apparatus and production apparatus for fine chemical compound, and a method for producing fine chemical compound.

  The invention according to claim 1 includes a first conduit for introducing a solution obtained by dissolving compound explosives in an organic solvent, a first conduit surrounding the first conduit, and coaxially disposed with the first conduit. And a second conduit for introducing carbon dioxide. The second conduit has an outlet end that is at least 5 mm longer than the outlet end of the first conduit so that the supercritical carbon dioxide and the solution come into contact with each other to recrystallize the chemicals. Is forming.

According to a second aspect of the present invention, in the fine particle generating apparatus for fine particle pyrotechnics according to the first aspect, the inner diameter of the second conduit in the single flow path is the same.
According to a third aspect of the present invention, in the fine particle generating device for the fine chemical compound according to the first or second aspect, the length of the single flow path is 5 mm to 200 mm.
According to a fourth aspect of the present invention, there is provided a fine particle generating device for a fine chemical compound according to any one of the first to third aspects, a fine particle collecting container connected to an outlet end of a second conduit, and a fine particle Dissolution connected to the outlet side of the collection container and connected to the first conduit and pressure control valve that adjusts the pressure inside the particulate collection container, and a solution obtained by dissolving chemical explosives in an organic solvent is supplied by a feed pump A liquid supply device and a critical carbon dioxide supply device that communicates with the second conduit and supplies critical carbon dioxide are provided. The critical carbon dioxide supply device includes a cooler that cools and liquefies carbon dioxide, a booster pump that pressurizes the cooled and liquefied carbon dioxide, and a heat exchanger that converts carbon dioxide introduced from the booster pump into supercritical carbon dioxide. Have.

  According to a fifth aspect of the present invention, in the method for recrystallizing into a fine powdered pyrotechnics using the apparatus for producing fine powdered pyrotechnics according to claim 4, supercritical carbon dioxide is being introduced into the second conduit. When the pressure in the second conduit reaches a predetermined pressure, the solution is introduced into the first conduit, and the supercritical carbon dioxide and the solution are brought into contact with each other at a predetermined flow rate in a single flow path. Recrystallized into fine powdered explosives of the body, and the recrystallized fine powdered explosives are collected in a particle recovery container.

According to a sixth aspect of the present invention, in the method for producing the micronized pyrotechnics according to the fifth aspect, the flow rate ratio of the supercritical carbon dioxide to the solution flow rate is 30 to 200.
According to a seventh aspect of the present invention, in the method for producing a fine chemical compound according to the fifth or sixth aspect, the pressure in the second conduit at the time of introducing the solution is 12.7 MPa to 29.4 MPa. .

  In the present invention, a superconducting carbon dioxide is used as a poor solvent, a chemical compound is dissolved in an organic solvent, and the first conduit and the second conduit are used for introducing and contacting the supercritical carbon dioxide and the dissolving liquid. A coaxial flow path (portion where the flow path of the first conduit and the flow path of the second conduit are overlapped) is provided in a part (predetermined range) of the superconducting carbon dioxide downstream of the coaxial flow path. It has a single flow path (the flow path of only the second conduit excluding the coaxial flow path) for resolving the chemical explosives in contact with the solution. The single flow path (the flow path of only the second conduit excluding the coaxial flow path) constitutes a relative position arranged downstream from the outlet end portion of the first conduit. Then, the super-sequentially introduced from the coaxial flow path (the flow path of the first conduit and the flow path of the second conduit) into the single flow path (the flow path of only the second conduit excluding the coaxial flow path). When the pressure in the second conduit reaches a predetermined pressure in the flow of critical carbon dioxide, a solution is introduced from the first conduit to bring them into contact with each other. As a result, contact and mixing of supercritical carbon dioxide and solution in a single channel, extraction of organic solvent, and recrystallization of compound explosives in the solution are carried out, and fine particle compound explosives controlled to be spherical. Can be manufactured.

  In the present invention, supercritical carbon dioxide is obtained by heating and pressurizing carbon dioxide to the critical point (critical temperature 31 ° C. and critical pressure 7.38 MPa) or higher, and is not liquefied even when further pressurized. It is carbon dioxide that has become a fluid and usually has gas and liquid properties. Supercritical carbon dioxide can be obtained, for example, by bringing commercially available carbon dioxide contained in a cylinder or the like to the critical point or higher. The carbon dioxide to be introduced is preferably carbon dioxide having a purity of 99.9% or more.

Moreover, as suitable temperature of the carbon dioxide of a supercritical state, it can be set to 31 to 150 degreeC, Preferably it can be set to 35 to 80 degreeC.
A suitable pressure of carbon dioxide in a supercritical state can be 12.7 MPa to 29.4 MPa, preferably 12.7 MPa to 19.6 MPa, more preferably 13.7 MPa to 19.6 MPa.

If the temperature of supercritical carbon dioxide is less than 31 ° C., or the pressure of supercritical carbon dioxide is less than 12.7 MPa, the particle shape of the obtained compound explosives becomes irregular, which is not preferable.
If the temperature of supercritical carbon dioxide exceeds 150 ° C, the recrystallized chemical explosives may ignite or explode due to heat, or the recrystallized chemical explosives may decompose by heat. This is not preferable.

When the pressure of supercritical carbon dioxide exceeds 29.4 MPa, the particle shape is equivalent to a spherical body in the range of 12.7 MPa to 29.4 MPa, so there is no point in making it higher than necessary.
The supercritical carbon dioxide and the solution introduced into the fine particle generator are introduced as a supercritical carbon dioxide / solution mass flow rate ratio of 30 to 200, preferably 50 to 150.
When the mass flow rate ratio of supercritical carbon dioxide / dissolved solution is less than 30, the resulting particle shape is irregular, which is not preferable. In addition, when the mass flow rate ratio of supercritical carbon dioxide / dissolved solution exceeds 200, the spherical shape is the same as that in the range of 30 to 200, so there is no point in making it higher than necessary.

Here, the calculation formula of the mass flow rate ratio is shown.
Mass flow rate ratio of supercritical CO ₂ / solution [−] = (supercritical CO ₂ mass flow rate [kg / hr] * 1000 [g / kg] / 60 [min / hr]) / solution mass flow rate [g / min]
For example, when the mass flow rate of supercritical carbon dioxide is 1.0 kg / hr, the mass flow rate of the solution is approximately 0.08 to 0.5 g / h from the above formula within a mass flow rate ratio of 30 to 200. It can be arbitrarily selected within the range of min.

-Example 1: (1.0 × 1000 ÷ 60) ÷ 30 [ratio] = 0.555 g / min
Example 2: (1.0 × 1000 ÷ 60) ÷ 200 [ratio] = 0.083 g / min
Compound explosives include, for example, trimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), pentaerythritol tetranitrate (PETN), hexanitrostilbene (HNS), and hexanitrohexaazai. Among chemical explosives including Seoul Titanium (CL-20), at least one chemical explosive can be used.

  An organic solvent is a liquid in which compound explosives are soluble and can be easily extracted with supercritical carbon dioxide. As the organic solvent, for example, one or a mixed solvent of two or more of acetone, cyclohexanone, dimethyl sulfoxide (DMSO), acetonitrile, γ-butyrolactone, methyl ethyl ketone, cyclopentanone, dimethylformamide (DMF), and the like is used. Preferably, acetone, cyclohexanone or DMSO is used.

In a solution obtained by dissolving chemical explosives in an organic solvent, the concentration of chemical explosives in the organic solvent can be set to any concentration up to the saturation concentration under the production conditions. Furthermore, in order to completely dissolve the chemical explosives raw material, the solution can be heated to a temperature not lower than room temperature and not higher than the boiling point of the organic solvent.
In the present invention, the particle shape is specified as “spherical body” or “irregularly shaped body”, but here it is used in the following meaning.

“Spherical body” refers to a shape having rounded corners such as a spherical body and an elliptical body. Moreover, these are mixed.
The “irregular shape body” refers to a plate shape, a rod shape, a flake shape (a scale piece, a thin flake, etc.), a needle shape or the like. Moreover, these are mixed.

ADVANTAGE OF THE INVENTION According to this invention, the micronized compound explosives controlled to the desired spherical shape with low sensitivity can be manufactured safely.
Further, according to the present invention, since recrystallization is performed in an atmosphere of carbon dioxide that is an inert gas, a highly safe manufacturing method can be provided. In addition, since carbon dioxide and organic solvents used during production can be recovered and reused, the amount of waste produced after production and the labor required for waste disposal can be reduced.

In addition, the fine powdered chemicals obtained by the present invention are dried fine particles having a low cohesiveness, and the complicated steps such as filtration, washing and drying steps after recrystallization generally performed in the prior art are omitted. In addition, it is possible to eliminate the influence on the fine particle quality given during the above-mentioned process.
In addition, the explosives manufactured using the fine powdered powdered explosives obtained by the present invention as a raw material have improved combustion characteristics or explosive characteristics and physical properties thereof, and the fine powdered explosives manufactured at the time of the production of the fine powder and manufactured Reduces the risk of ignition and explosion due to shock and friction when handling.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 shows a fine particle generating apparatus 10 for a fine chemical compound according to an embodiment of the present invention (corresponding to claims 1, 2 and 3).
In the particulate generator 10 according to the present embodiment, a first conduit 11 having a small inner diameter is mounted on the inner side of a second conduit 12 having a large inner diameter in a coaxial direction. A supercritical carbon dioxide and a solution are partially introduced to form a coaxial flow path 13 that does not come into contact with each other, a single flow path 14 is formed continuously downstream of the coaxial flow path 13, and a single flow path In FIG. 14, the outlet end 11 a of the first conduit 11 constituting the coaxial flow path 13 is disposed upstream of the outlet end 12 a of the second conduit 12.

  The second conduit 12 uses, for example, silica as a material, and its inner diameter is 0.2 mm to 3.0 mm, preferably 0.3 mm to 1.0 mm. The inner diameter of the second conduit 12 is an external flow path. 15 and the single channel 14 are preferably substantially the same size. If the outlet end portion 12a of the second conduit 12 has a structure in which the inner diameter of the outlet end portion 12a of the second conduit 12 is reduced so as to have a tapered shape, clogging by generated particles occurs in the single flow path 14, which is not preferable. .

The outer diameter of the second conduit 12 depends on the material characteristics used, and can be arbitrarily selected so as to have a thickness that does not break at a suitable pressure and temperature described below. In addition, for example, when silica is used as the material of the second conduit 12, a means for reinforcing the outer periphery of the second conduit 12 with a tube or tube of SUS316 may be taken.
The first conduit 11 is made of, for example, silica and has an inner diameter of 0.05 mm to 0.8 mm, preferably 0.07 mm to 0.2 mm. The outer diameter of the first conduit 11 is such that the ratio of the inner diameter of the second conduit 12 to the outer diameter of the first conduit 11 is 1 in the coaxial flow path 13 configured when mounted in the second conduit 12. .5 to 4.0, preferably 1.6 to 2.1.

If the ratio of the inner diameter of the second conduit 12 / the outer diameter of the first conduit 11 is greater than 4.0, the resulting recrystallized compound explosive particles have an irregular shape, which is not preferable.
The outlet end 11 a of the first conduit 11 is disposed upstream of the outlet end 12 a of the second conduit 12. This relative position is arrange | positioned in the range of 5 mm-200 mm, for example. When it exceeds 200 mm, the particle shape becomes a spherical body equivalent to the range of 5 mm to 200 mm, so there is no point in making the relative position longer than necessary. If it is less than 5 mm, the particle shape becomes irregular. That is, when the thickness is less than 5 mm, a mass transfer process from contact between supercritical carbon dioxide and the solution to recrystallization of the compound explosives is performed outside the particle generation apparatus 10, and the solution is placed in a particle collection container to be described later. After the liquid is dispersed or substantially simultaneously with the dispersion, the recombination of the compound explosives takes place, but the fine droplets dispersed during the recrystallization process are aggregated and recrystallized, or supercritical carbon dioxide. Since the organic solvent is not sufficiently extracted into the fine particles, the organic solvent stays in the fine particle collecting container and crystal growth of the generated particles occurs, so that the shape of the compound explosive particles becomes irregular.

Next, the operation of the particulate generator 10 according to the present embodiment will be described.
A solution is introduced at a predetermined flow rate into a flow of supercritical carbon dioxide continuously introduced from the coaxial flow channel 13 into the single flow channel 14. At that time, the supercritical carbon dioxide is in a predetermined pressure state. Thereby, both are made to contact and a solution is disperse | distributed in the single flow path 14, In this single flow path 14, mixing of a supercritical carbon dioxide and a solution, extraction of the organic solvent to supercritical carbon dioxide, Then, the compound explosives in the solution are recrystallized, and fine compound explosives controlled to a spherical shape of 10 μm or less are deposited.

  As described above, in the fine particle generation device 10 according to the present embodiment, the micro droplets of the dissolved liquid dispersed at a predetermined flow rate in an atmosphere in which supercritical carbon dioxide is continuously introduced at a predetermined pressure and flow rate, The chemical transfer explosives recrystallize in units of small droplets without agglomerating with each other, and the mass transfer process from contact of supercritical carbon dioxide with the solution to recrystallization of chemical explosives 10, the fine compounding explosives guided through the outlet end portion 12a of the second conduit 12 are controlled in a spherical shape by eliminating factors affecting the particle shape such as subsequent crystal growth and aggregation. Chemical explosive fine particles can be generated.

Moreover, the suitable temperature of the carbon dioxide of a supercritical state is 31 to 150 degreeC, Preferably it is 35 to 80 degreeC.
FIG. 2 shows an outline of the micronized pyrotechnics manufacturing apparatus 100 according to an embodiment of the present invention.
The particulate generator 10 is disposed on the upper surface of the particulate collection container 20.
A solution introduction pipe 42 is disposed in the first conduit 11 of the particulate generator 10. The solution introduction pipe 42 communicates with the inside of the storage container 38 for containing a solution obtained by dissolving chemical compounds in an organic solvent via a valve 40 and a liquid feed pump 39. The solution introduction pipe 42 includes a temperature controller 41 that heats the solution introduction pipe 42.

A carbon dioxide introduction pipe 37 is disposed in the second conduit 12 of the particulate generator 10. The carbon dioxide introduction pipe 37 communicates with the carbon dioxide cylinder 30 through a heat exchanger 36 including a temperature controller 35, a valve 34, a booster pump 33, a valve 32, and a cooler 31.
In the present embodiment, the carbon dioxide introduced into the particulate generator 10 is preliminarily heated to a suitable temperature by the heat exchanger 36. If the supercritical carbon dioxide introduced into the fine particle generation apparatus 10 is not introduced at a suitable temperature, the particle shape of the obtained compound explosive particles becomes irregular, which is not preferable.

  The heat exchanger 36 is used for warming carbon dioxide to a suitable temperature in the process of introducing and boosting carbon dioxide from the booster pump 33 and introducing the carbon dioxide into the particulate generator 10 as supercritical carbon dioxide. For example, the heat exchanger 36 is formed by winding a SUS316 tube having an outer diameter of 1/16 inch, an inner diameter of 0.8 mm, and a length of 15 m on a circumference of a SUS pipe having an outer diameter of 100 mm, an inner diameter of 97 mm, and a length of 270 mm. A heat insulator is wound around and a temperature controller 35 is installed.

  The particulate collection container 20 includes a temperature controller 25 and a pressure gauge 26. In the particulate collection container 20, in order to prevent the generated chemical explosives particulates from being discharged from the particulate collection container 20, a collecting means 21 is provided in advance at the outlet of the bottom surface portion of the particulate collection container 20. For example, a membrane filter, a filter paper, a sintered metal filter, or the like can be used as the collection means 21, and the collection means 21 can be used by fixing the collection means 21 with an aluminum tape or the like at the discharge port of the particulate collection container 20.

  When the pressure is raised to a suitable pressure, the fine particle collection container 20 communicates with a pressure regulating valve 22 that holds the pressure. The pressure regulating valve 22 discharges carbon dioxide from the discharge port in order to maintain the pressure. The carbon dioxide discharged from the discharge port of the pressure regulating valve 22 is guided to the flow meter 24 through the separation container 23, and the pressure is increased so that a suitable mass flow rate is obtained while the flow rate of the discharged carbon dioxide is monitored by the flow meter 24. The flow rate of the pump 33 is adjusted.

Next, the effect | action by the manufacturing apparatus 100 of the fine particle compound explosives which concern on this embodiment is demonstrated.
The heat exchanger 36 and the particulate collection container 20 are preheated to a suitable temperature. The temperatures of the heat exchanger 36 and the particulate collection container 20 are preferably substantially the same, or the temperature of the heat exchanger 36 may be somewhat higher.
The carbon dioxide from the carbon dioxide cylinder 30 is cooled and liquefied through the cooler 31 and introduced into the booster pump 33. If the carbon dioxide is not cooled and liquefied before being introduced into the booster pump 33, bubbles will enter the booster pump 33, making it difficult to introduce carbon dioxide after the booster pump 33, and the flow rate of the introduced carbon dioxide is high. Since it falls, it is not preferable.

  The pressurizing pump 33 is operated to introduce carbon dioxide into the heat exchanger 36, and further introduced into the particulate collection container 20 from the carbon dioxide introduction pipe 37 through the second conduit 12 of the particulate production apparatus 10, and the pressure is increased to a suitable pressure. Here, the pressure holding region in FIG. 2 is a range from the valves 34 and 40 installed downstream of the booster pump 33 and the liquid feed pump 39 to the pressure regulating valve 22. Since the pressure holding area is wide, in the present embodiment, the pressure gauge 26 is typically installed in the particulate collection container 20 for measurement.

In the process of introducing and increasing the pressure of carbon dioxide, carbon dioxide passes through the heat exchanger 36 and becomes supercritical carbon dioxide.
When the inside of the particulate collection container 20 is increased to a suitable pressure, the pressure regulating valve 22 acts so as to maintain the pressure. At this time, if carbon dioxide is continuously introduced by the booster pump 33, carbon dioxide is discharged from the outlet of the pressure regulating valve 22 while maintaining the pressure.

The carbon dioxide discharged from the discharge port of the pressure regulating valve 22 is guided to the flow meter 24 through the separation container 23, and the pressure is increased so that a suitable mass flow rate is obtained while the flow rate of the discharged carbon dioxide is monitored by the flow meter 24. The flow rate of the pump 33 is adjusted.
When the supercritical carbon dioxide to be introduced is controlled to a suitable temperature, pressure, and mass flow rate, a solution obtained by dissolving chemical compounds in an organic solvent in advance using a liquid feed pump 39 is dissolved at a suitable flow rate. The liquid is introduced from the liquid introduction pipe 42 into the first conduit 11 of the fine particle generating apparatus 10. At that time, in order to prevent the compound explosives in the solution from precipitating in the solution introduction tube 42 and in the second conduit 12 of the fine particle generating apparatus 10, the solution introduction tube is used in advance using the temperature controller 41. Warm 42. Furthermore, it is better to introduce only the organic solvent that does not contain chemical explosives before introducing the solution, and then introduce the solution.

  By dissolving the solution introduced through the first conduit 11 into the flow of supercritical carbon dioxide continuously introduced through the second conduit 12 of the particulate generator 10, the solution is dissolved in the single channel 14. The liquid is dispersed and mixed vigorously with supercritical carbon dioxide. At the same time, extraction of the organic solvent into supercritical carbon dioxide is performed to recrystallize the compound explosives. It is guided into the particulate collection container 20 through the outlet end 12 a of the second conduit 12.

  After completion of the recrystallization, only supercritical carbon dioxide is introduced for 1 hour or more while maintaining a suitable temperature, pressure, and mass flow rate, and the organic solvent remaining in the fine particle collection container 20 is removed by supercritical carbon dioxide. If the introduction of supercritical carbon dioxide is insufficient, the removal of the remaining organic solvent becomes insufficient, and when the carbon dioxide is discharged under reduced pressure, gas-liquid phase separation occurs in the particulate collection container 20, and the organic solvent phase is changed. Appearing and falling on the recrystallized fine powdered explosives, which may affect the particle shape and particle size, which is undesirable. Furthermore, the resulting fine powdered explosives may be redissolved in the organic solvent phase that appears, which may reduce the yield, which is not preferable.

  At this time, the supercritical solution containing the organic solvent discharged from the discharge port of the pressure regulating valve 22 is guided to the separation container 23. Carbon dioxide and an organic solvent are separated in a separation container 23 under an atmospheric pressure atmosphere. The separated organic solvent remains in the separation container 23, and the carbon dioxide is guided to the flow meter 24. The organic solvent remaining in the separation container 23 and the carbon dioxide discharged from the flow meter 24 can be recovered and reused.

By discharging the carbon dioxide and reducing the pressure, it is possible to easily collect the spherically controlled fine particle compound explosives controlled in the spherical shape from the fine particle collecting container 20 and the collecting means 21.
As the stainless steel tube, for example, a SUS316 tube having an outer diameter of 1/4 inch and an inner diameter of 5 mm can be used.
As described above, according to the present embodiment, not only the contact of the supercritical carbon dioxide and the solution is performed in the single flow path 14 and the dispersion of the solution is performed, but also the continuous flow of the supercritical carbon dioxide. Prevents the dispersed fine droplets of the dissolved solution from aggregating with each other and increases the mixing with the dissolved solution, thereby efficiently extracting the organic solvent and the core of the chemical explosives in the dissolved solution. Crystal growth occurring following the formation is suppressed, and spherical compounded explosives controlled to be spherical can be obtained. Desired spherical controlled fine particle compound explosives can not only reduce handling sensitivity, but also such compound explosive fine particles can be packed at high density, thus improving combustion characteristics. .

  In addition, since supercritical carbon dioxide can be removed as a gas when the pressure is reduced, dry particulate compound explosives can be obtained, and the process after recrystallization is easy. Furthermore, since the organic solvent can be easily separated and recovered from the discharged carbon dioxide, the separated carbon dioxide and the organic solvent can be recovered and reused. Not only can the amount be reduced, but also the labor required for waste disposal can be reduced.

In addition, since carbon dioxide is an inert gas, the process for producing fine powders of chemical explosives is performed under an inert atmosphere, and the risk of ignition and explosion during production can be eliminated.
The thus obtained dried spherical fine particle compound explosives can be directly used as a fine particle powder product without further pulverization, washing and drying steps.
In addition, moderate moisture can be added to store and store the fine particle compound explosives dried in a spherical shape.

  In addition, the fine powdered explosives are not affected by changes in particle shape and particle diameter due to particle aggregation and crystal growth during storage and storage.

Hereinafter, a method for obtaining the fine powdered explosives using the fine powdered explosives manufacturing apparatus 100 shown in FIG. 2 will be specifically described. In addition, as described above, it is possible to add process changes within a range that does not hinder the essential method and effect of the present invention, and the present invention is not limited to each example.
The measurement methods used in the examples are as follows.
(Particle size distribution measurement)
Prepare 5 to 10 ml of an about 1% aqueous solution of a surfactant (dispersion medium) in a test tube, add about 0.1 g of RDX fine particle powder to this, and disperse by ultrasonic for several minutes. A particle size distribution measurement was performed on the dispersed fine particle powder sample according to the following measurement conditions.

・ Laser diffraction / scattering type particle size distribution analyzer (LMS-300 manufactured by Seishin Enterprise Co., Ltd.)
・ Measurement principle (laser diffraction and scattering method)
・ Light source (semiconductor laser (wavelength 670 nm / maximum output 2 mW))
・ Detector (49-element semicircular silicon photodiode and 6-element forward / backward silicon photodiode)
・ Dispersion method (stirrer and ultrasonic)
(Explanation of particle size distribution diagram)
In the particle size distribution diagrams shown in FIGS. 3 and 4, a frequency distribution diagram and a particle size cumulative curve are shown.

The frequency distribution diagram is drawn as a columnar diagram in the figure, and is drawn by taking the particle diameter on the horizontal axis and the relative frequency (Q3 [%] on the vertical axis in the figure) on the vertical axis. From the frequency distribution chart, it is possible to see the distribution bias. When it is symmetric, it is called a symmetric distribution.
The particle size accumulation curve is drawn as a curve in the figure. The relative accumulation frequency (q3 [%] on the vertical axis in the figure) obtained by accumulating the relative frequency is calculated and taken on the vertical axis, and the particle diameter is taken on the horizontal axis. It is drawn by that.

The particle diameter corresponding to the median cumulative value (50%) of the particle size accumulation curve is called the median diameter, and the median diameter is used as the average particle diameter described in the specification.
The particle size distribution chart shown in FIG. 3 shows the particle size distribution of the RDX fine particle powder obtained in Example 1. The frequency distribution diagram shows a distribution close to a symmetric distribution, and the average particle size obtained from the particle size cumulative curve was 2.8 μm.

The particle size distribution chart shown in FIG. 4 shows the particle size distribution of the RDX fine particle powder obtained in Example 2. Similar to FIG. 3, the distribution was close to a symmetrical distribution, and the average particle size obtained from the cumulative particle size curve was 2.7 μm.
Example 1
2.4 g of dried RDX (average particle size 61 μm) was added to 20 g of cyclohexanone, heated to 50 ° C. and stirred to prepare a solution in which RDX was completely dissolved.

The fine particle generator 10 includes a first conduit 11 (material silica) having an outer diameter of 0.2 mm and an inner diameter of 0.1 mm, and a second conduit 12 (material silica) having an outer diameter of 0.45 mm and an inner diameter of 0.32 mm. And the outlet end portion 11a of the first conduit 11 is arranged at a position of 150 mm upstream from the outlet end portion 12a of the second conduit 12.
The heat exchanger 36 and the particulate collection container 20 were heated to 50 ° C., the pressure of the particulate collection container 20 was controlled to 13.7 MPa, and the mass flow rate of carbon dioxide was controlled to about 1.0 kg / hr.

When supercritical carbon dioxide is continuously introduced through the second conduit 12 and the solution is introduced into the first conduit 11 at a flow rate of 0.2 g / min while maintaining the temperature at 50 to 60 ° C., The recrystallized RDX fine particles were introduced into the fine particle collection container 20 from the outlet end portion 12 a of the second conduit 12.
After completion of recrystallization, only supercritical carbon dioxide was flowed at a mass flow rate of about 1.0 kg / hr for about 1 hour or more to remove residual cyclohexanone. After discharging carbon dioxide in the fine particle collecting container 20 and reducing the pressure, white RDX fine particle powder was collected from the fine particle collecting container 20 and the collecting means 21.

The result of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement is shown in Table 1 and FIG. 3, and the electron micrograph of the obtained RDX fine particle powder is shown in FIG.
As shown in FIG. 3, the obtained RDX fine particle powder was a fine particle powder having a narrow particle size distribution, and the average particle size was 2.8 μm. As shown in FIG. 5, it was found that the obtained RDX fine particle powder was spherical.

Further, the obtained RDX fine particle powder was stored and stored for 1 month at room temperature and atmospheric pressure, and when the average particle size of the RDX fine particle powder was measured, the average particle size was 3.1 μm.
There was no change in the average particle size of the RDX fine particle powder immediately after production and after one month at room temperature, and it was found that the RDX fine particle powder obtained in this example was a finely-coagulated fine particle.

(Example 2)
1.6 g of dried RDX (average particle size 61 μm) was added to 20 g of acetone, and heated to 40 ° C. and stirred to prepare a solution in which RDX was completely dissolved.
Fine particle powder was produced in the same manner as in Example 1 except that the organic solvent for dissolving RDX was replaced with acetone.

The results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement are shown in Table 1 and FIG. 4, and the electron micrograph of the obtained RDX fine particle powder is shown in FIG.
As shown in FIG. 4, the obtained RDX fine particle powder was a fine particle powder having a narrow particle size distribution, and the average particle size was 2.7 μm.
As shown in FIG. 6, it was found that the obtained RDX fine particle powder was spherical.

Furthermore, when the obtained RDX fine particle powder was stored and stored for 1 month at room temperature and atmospheric pressure, and the average particle size of the RDX fine particle powder was measured, the average particle size was 2.8 μm.
There was no change in the average particle size of the RDX fine particle powder immediately after production and after one month at room temperature, and it was found that the RDX fine particle powder obtained in this example was a finely-coagulated fine particle.

Example 3 (Influence of relative position)
Examination of the influence of the relative position between the outlet end 12a of the second conduit 12 and the outlet end 11a of the first conduit 11 on the particle shape and average particle diameter of the obtained RDX particulate powder of the particulate generator 10 did.
The fine particle generator 10 includes a first conduit 11 (material silica) having an outer diameter of 0.2 mm and an inner diameter of 0.1 mm, and a second conduit 12 (material silica) having an outer diameter of 0.45 mm and an inner diameter of 0.32 mm. The outlet end portion 11a of the first conduit 11 was produced in the same manner as in Example 1 at a position of 5 to 200 mm upstream from the outlet end portion 12a of the second conduit 12.

The results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement are shown in Table 1, and the particle shape photographs of the RDX fine particle powder obtained at the respective relative positions are shown in FIGS.
From the above results, when the outlet end portion 11a of the first conduit 11 is disposed at a position of 5 to 200 mm upstream from the outlet end portion 12a of the second conduit 12, the particle shape of the obtained RDX fine particle powder is spherical. A controlled RDX fine particle powder having an average particle size of 3 μm or less can be obtained.

(Example 4) (Influence of mass flow rate of supercritical carbon dioxide)
The influence of the mass flow rate of supercritical carbon dioxide on the particle shape and average particle size of the obtained RDX fine particle powder was examined.
The mass flow rate of carbon dioxide is in the range of 0.4 kg / hr to 1.2 kg / hr, and the mass flow rate of supercritical carbon dioxide / mass flow rate ratio of the solution is 33 to 100 [-] in the same manner as in Example 1. Fine particle powder was produced.

Table 1 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement in the same manner as in Example 1.
From the above results, when the mass flow rate of supercritical carbon dioxide is slowed down, the particle size of the obtained RDX fine particle powder becomes large, and when the mass flow rate of supercritical carbon dioxide is made fast, the particle size of the obtained RDX fine particle powder becomes small. . By controlling the mass flow rate of supercritical carbon dioxide, it is possible to control the desired average particle size while maintaining the particle shape of the obtained RDX fine particle powder in a spherical shape.

(Example 5) (Influence of flow rate of solution)
The influence of the flow rate of the solution introduced into the first conduit 11 of the fine particle generator 10 on the particle shape and average particle diameter of the obtained RDX fine particle powder was examined.
The mass flow rate of the supercritical carbon dioxide is 0.8 kg / hr, the flow rate of the solution is 0.1 to 0.3 g / min, and the mass flow rate of the supercritical carbon dioxide / the mass flow rate of the solution 44 to 133 [ The fine particle powder was produced in the same manner as in Example 1 in [-].

Table 1 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement in the same manner as in Example 1.
By adjusting the balance between the flow rate of the supercritical carbon dioxide introduced into the fine particle generating apparatus 10 and the solution, it is possible to produce a desired spherically controlled RDX fine particle powder.
(Example 6) (Influence of pressure)
The influence of the pressure of supercritical carbon dioxide on the particle shape and average particle size of the obtained RDX fine particle powder was examined.

Fine particle powder was produced in the same manner as in Example 1 except that the pressure in the fine particle generator 10 and the fine particle collection container 20 was in the range of 12.7 MPa to 17.6 MPa and the mass flow rate of supercritical carbon dioxide was 0.5 kg / hr. Manufactured.
Table 1 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement in the same manner as in Example 1.

From the above results, by setting the pressure to 12.7 MPa or more, it is possible to obtain a desired spherically controlled RDX fine particle powder.
(Example 7) (Influence of temperature)
The effects of the temperature of the heat exchanger 36 and the fine particle collection container 20 on the particle shape and average particle diameter of the obtained RDX fine particle powder were examined.

Fine particle powder was produced in the same manner as in Example 1 except that the temperature of the heat exchanger 36 and the fine particle collection container 20 was in the range of 32 to 80 ° C.
Table 1 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement. Moreover, the particle shape photograph of RDX fine particle powder obtained at each temperature is shown in FIG. 5 and FIGS.

From the above results, by setting the temperature of the heat exchanger 36 and the particulate collection container 20 to be equal to or higher than the critical temperature of carbon dioxide, it is possible to obtain RDX particulate powder controlled to have a desired spherical shape.
(Example 8) (Influence of second conduit inner diameter, first conduit outer diameter and first conduit inner diameter)
Examining the effects of the inner diameter of the second conduit 12, the outer diameter of the first conduit 11, and the inner diameter of the first conduit 11 constituting the particulate generator 10 on the particle shape and average particle diameter of the obtained RDX particulate powder did.

The second conduit 12 has an inner diameter of 0.2 to 0.8 mm, the first conduit 11 has an outer diameter of 0.13 to 0.2 mm, and an inner diameter of 0.05 to 0.32 mm. The fine particle powder was produced in the same manner as in Example 1 except that the ratio of the inner diameter of the conduit 12 to the outer diameter ratio of the first conduit 11 was 1.5 to 4.0 [-].
Table 1 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement.

  From the above results, if a combination of the inner diameter of the second conduit 12 and the outer diameter of the first conduit 11 constituting the particulate generator 10 is selected, a desired average particle diameter of the RDX particulate powder whose particle shape is controlled to be spherical is selected. Can be controlled.

（比較例１）（相対位置の影響）
微粒子生成装置１０の第二の導管１２の出口端部１２ａと第一の導管１１の出口端部１１ａの相対位置が、得られるＲＤＸ微粒子粉末の粒子形状および平均粒子径に及ぼす影響を検討した。

(Comparative Example 1) (Influence of relative position)
The influence of the relative positions of the outlet end portion 12a of the second conduit 12 and the outlet end portion 11a of the first conduit 11 on the particle shape and average particle diameter of the obtained RDX particulate powder was examined.

The fine particle generator 10 includes a first conduit 11 (material silica) having an outer diameter of 0.2 mm and an inner diameter of 0.1 mm, and a second conduit 12 (material silica) having an outer diameter of 0.45 mm and an inner diameter of 0.32 mm. In the same manner as in Example 1, fine particle powder production was performed by setting the outlet end portion 11a of the first conduit 11 upstream of the outlet end portion 12a of the second conduit 12 to a position of 1 to 3 mm.
The results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement are shown in Table 2, and the outlet end 11a of the first conduit 11 is 1 mm upstream from the outlet end 12a of the second conduit 12. FIG. 16 shows a particle shape photograph of the RDX fine particle powder obtained at the position.

From the above results, when the outlet end portion 11a of the first conduit 11 is disposed at a position of 1 to 3 mm upstream from the outlet end portion 12a of the second conduit 12, the particle shape of the obtained RDX fine particle powder is irregular. It becomes a shape.
(Comparative Example 2) (Influence of flow rate of solution)
The influence of the flow rate of the solution introduced into the first conduit 11 of the fine particle generator 10 on the particle shape and average particle diameter of the obtained RDX fine particle powder was examined.

The mass flow rate of supercritical carbon dioxide is 0.8 kg / hr, the flow rate of the solution is 0.5 g / min, and the mass flow rate of supercritical carbon dioxide / the mass flow rate of the solution is 27 [−], as in Example 1. The fine particle powder was produced by the method described above.
Table 2 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement.

From the above results, when the mass flow rate ratio of the supercritical carbon dioxide and the solution introduced into the fine particle generating apparatus 10 is less than 30, the particle shape of the obtained RDX fine particle powder becomes an irregular shape.
(Comparative Example 3) (Influence of pressure)
The influence of the pressure of supercritical carbon dioxide on the particle shape and average particle size of the obtained RDX fine particle powder was examined.

A fine particle powder was produced in the same manner as in Example 1 except that the pressure in the fine particle generator 10 and the fine particle collection container 20 was 9.8 MPa to 11.8 MPa and the mass flow rate of supercritical carbon dioxide was 0.5 kgf / hr. went.
Table 2 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement.

From the above results, when the pressure is 11.8 MPa or less, the particle shape of the obtained RDX fine particle powder becomes an irregular shape.
(Comparative Example 4) (Influence of temperature)
The influence of the temperature of the heat exchanger 36 and the fine particle collection container 20 on the average particle size of the obtained RDX fine particle powder was examined.

Fine particle powder was produced in the same manner as in Example 1 except that the temperature of the heat exchanger 36 and the fine particle collection container 20 was set to 22 ° C. or 28 ° C.
Table 2 shows the results of measuring the particle size of the obtained RDX fine particle powder by particle size distribution measurement. Moreover, the particle shape photograph of RDX fine particle powder obtained at each temperature is shown in FIGS. 17 and 18, respectively.

  From the above results, when the temperature of the heat exchanger 36 and the particulate collection container 20 is less than the critical temperature of carbon dioxide, the resulting RDX particulate powder has an irregular shape.

  The spherical fine particle powdered compound explosives obtained in the present invention are raw materials used for the production of powdered propellants and the like, and the production of a thin film detonator (Exploding Foil Initiator) or a non-prime detonator (Non Primary Electronic Detonator) Can be used as a raw material.

1 is a schematic view of a fine particle generating device for a fine chemical compound according to an embodiment of the present invention. Schematic of the manufacturing apparatus of fine chemical compound concerning one Embodiment of this invention. The figure which shows the particle size distribution (average particle diameter of 2.8 micrometers) of RDX fine particle powder obtained by Example 1. FIG. The figure which shows the particle size distribution (average particle diameter of 2.7 micrometers) of RDX fine particle powder obtained by Example 2. FIG. The electron micrograph (2000 times) of RDX fine particle powder obtained by Example 1. FIG. The electron micrograph (3500 times) of RDX fine particle powder obtained by Example 2. FIG. The electron micrograph (2000 times) of RDX fine particle powder obtained in Example 3 with the relative position of 5 mm. The electron micrograph (2000 times) of the RDX fine particle powder obtained in Example 3 at a relative position of 10 mm. The electron micrograph (2000 times) of the RDX fine particle powder obtained in Example 3 at a relative position of 50 mm. The electron micrograph (2000 times) of RDX fine particle powder obtained in Example 3 with the relative position of 100 mm. The electron micrograph (1500 times) of RDX fine particle powder obtained in Example 3 with the relative position of 200 mm. The electron micrograph (2000 times) of RDX fine particle powder obtained in Example 7 at the temperature of 32 degreeC. The electron micrograph (2000 times) of RDX fine particle powder obtained in Example 7 at the temperature of 35 degreeC. The electron micrograph (3500 times) of RDX fine particle powder obtained at the temperature of 38 degreeC in Example 7. FIG. The electron micrograph (3500 times) of RDX fine particle powder obtained at the temperature of 80 degreeC in Example 7. FIG. 4 is an electron micrograph (1000 ×) of RDX fine particle powder obtained in Comparative Example 1. FIG. The electron micrograph (2000 times) of the RDX fine particle powder obtained at the temperature of 22 degreeC in the comparative example 4. FIG. The electron micrograph (2000 times) of RDX fine particle powder obtained at the temperature of 28 degreeC in the comparative example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fine particle generating apparatus 11 of fine particle compound explosives 11 1st conduit | pipe 11a Outlet end part 12 2nd conduit | pipe 12a Outlet end part 13 Coaxial flow path 14 Single flow path 15 External flow path 20 Fine particle collection container 21 Collection means 22 Pressure adjustment Valve 23 Separation container 24 Flow meter 25 Temperature controller 26 Pressure gauge 30 Carbon dioxide cylinder 31 Cooler 32 Valve 33 Booster pump 34 Valve 35 Temperature controller 36 Heat exchanger 37 Carbon dioxide introduction pipe 38 Dissolving solution storage container 39 Pump 40 Valve 41 Temperature controller 42 Dissolving liquid introduction pipe 100 Fine chemical compound manufacturing apparatus

Claims (7)

A first conduit for introducing a solution obtained by dissolving chemical explosives in an organic solvent;
A second conduit surrounding the first conduit and coaxially disposed with the first conduit for introducing supercritical carbon dioxide;
The second conduit has an outlet end that is at least 5 mm longer than the outlet end of the first conduit, and the supercritical carbon dioxide and the solution come into contact to recrystallize the chemical explosives. An apparatus for producing fine particles of a powdered pyrotechnics, characterized in that a single flow path is formed.   2. The fine particle generating apparatus for fine particle compound explosives according to claim 1, wherein the inner diameter of the second conduit in the single channel is the same.   The fine particle generating apparatus for fine particle compound explosives according to claim 1 or 2, wherein the single flow path has a length of 5 mm to 200 mm. The fine particle generating apparatus for the fine chemical compound according to any one of claims 1 to 3,
A particulate collection container connected to the outlet end of the second conduit;
A pressure regulating valve that communicates with the outlet side of the particulate collection container and regulates the pressure in the particulate collection container;
A solution supply device that communicates with the first conduit and supplies a solution obtained by dissolving the compound explosives in an organic solvent by a liquid feed pump;
A critical carbon dioxide supply device that communicates with the second conduit and supplies the critical carbon dioxide;
The critical carbon dioxide supply device includes a cooler that cools and liquefies carbon dioxide, a booster pump that pressurizes the cooled and liquefied carbon dioxide, and a heat exchanger that converts carbon dioxide introduced from the booster pump to supercritical carbon dioxide. An apparatus for producing fine powder compound explosives characterized by comprising: In the method of recrystallizing into a fine powdered explosives using the apparatus for producing a fine powdered explosive according to claim 4,
When the pressure in the second conduit reaches a predetermined pressure during the introduction of the supercritical carbon dioxide into the second conduit, the solution is introduced into the first conduit and the single stream The supercritical carbon dioxide and the solution are brought into contact with each other at a predetermined flow rate in the channel to recrystallize into spherical fine particle compound explosives, and the recrystallized fine particle compound explosives are recovered in the particle recovery container. A method for producing a fine chemical compound characterized by the above.   6. The method for producing a micronized pyrotechnics according to claim 5, wherein a flow rate ratio of the supercritical carbon dioxide to the solution flow rate is 30 to 200.   The method for producing a fine chemical compound according to claim 5 or 6, wherein the pressure in the second conduit at the time of introducing the solution is 12.7 MPa to 29.4 MPa. A method for producing chemical explosives.

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