WO2021230154A1 - Milieu de refroidissement, congélateur et procédé de production d'un produit congelé - Google Patents

Milieu de refroidissement, congélateur et procédé de production d'un produit congelé Download PDF

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Publication number
WO2021230154A1
WO2021230154A1 PCT/JP2021/017526 JP2021017526W WO2021230154A1 WO 2021230154 A1 WO2021230154 A1 WO 2021230154A1 JP 2021017526 W JP2021017526 W JP 2021017526W WO 2021230154 A1 WO2021230154 A1 WO 2021230154A1
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weight
powder
cooling medium
ethanol solution
aqueous ethanol
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PCT/JP2021/017526
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English (en)
Japanese (ja)
Inventor
弘一 仁居
正彦 田中
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感動創出工場ジーンファクトリー株式会社
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Publication of WO2021230154A1 publication Critical patent/WO2021230154A1/fr

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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/10—Liquid materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies

Definitions

  • the present invention relates to a method for manufacturing a cooling medium, a freezer and a frozen product, and more particularly to a method for manufacturing a cooling medium, a freezer and a frozen product for freezing such as food, cosmetics or medical articles.
  • the freezer has a brine-type freezer that freezes an object by immersing it in a liquid that has been cooled to below freezing point.
  • a brine composition has been proposed, characterized in that a mixture containing ethyl alcohol, water and propylene glycol is used as a brine for food (see, for example, Patent Document 1).
  • the present invention has been made in view of such a situation, and suppresses coagulation at a lower temperature so that an article can be frozen more safely and faster.
  • the cooling medium according to the first aspect of the present invention is a cooling medium that is stored in a container in a freezer and cooled, and is used as a liquid for freezing the article by immersing the article in it. It contains a powder obtained by crushing a product obtained by thermally decomposing seeds at 400 ° C. or higher and lower than 500 ° C., and a water-soluble silicon compound.
  • the powder may be 0.1% by weight to 1.0% by weight with respect to the aqueous ethanol solution, and the water-soluble silicon compound may be 0.1% by weight to 1.0% by weight with respect to the aqueous ethanol solution. ..
  • the powder When the powder is dispersed in an aqueous ethanol solution, the powder can be kept in a suspended state for 24 hours or more in a stationary state.
  • the powder can have a representative value of 10 ⁇ m or less, which indicates the center of the particle size distribution.
  • the powder can contain 15% by weight to 19% by weight of potassium and 1% by weight to 3% by weight of phosphorus.
  • the powder can generate a zeta potential of minus 0.5 mV in a pH 7 solution.
  • the powder can be made by crushing a product obtained by thermally decomposing seeds, which are beans.
  • the ethanol aqueous solution can contain less than 60% by weight of ethanol.
  • the freezer can store the cooling medium in the internal container.
  • a powder obtained by crushing a product obtained by thermally decomposing plant seeds at 400 ° C. or higher and lower than 500 ° C. is mixed with an aqueous ethanol solution to prepare an aqueous ethanol solution.
  • a water-soluble silicon compound is mixed, and the ethanol aqueous solution in which the powder and the silicon compound are mixed is cooled to a temperature lower than 0 ° C. in a liquid state, the article is placed in a sealed container, and the article placed in the sealed container is placed. Immerse in a cooled aqueous solution of ethanol and freeze.
  • solidification can be suppressed at a lower temperature, and the article can be frozen more safely and faster.
  • FIG. 1 is a diagram illustrating the appearance of the freezer according to the embodiment of the present invention.
  • the freezer 1 is an example of a freezer, and is an integrated freezer having a substantially rectangular parallelepiped outer shape.
  • the freezer 1 incorporates a compressor, a condenser, an expansion valve, an evaporator, and the like, and a cooler is embedded in the inner wall of the freezer chamber, which will be described later, to cool the freezer chamber to a temperature lower than zero degrees Celsius.
  • the freezer 1 has a built-in compressor, condenser, expansion valve, evaporator, etc., and can be opened and closed freely with respect to the main body 11 having a freezing chamber inside and the main body 11 via a hinge (not shown). It includes a door 12 provided and a temperature controller 13 for adjusting the temperature in the freezing chamber.
  • the direction connecting the upper right and the lower left in FIG. 1 is the X-axis direction.
  • the direction connecting the lower right and the upper left in FIG. 1 indicates the Y-axis direction, and the vertical direction in FIG. 1 indicates the Z-axis direction.
  • FIG. 2 is a cross-sectional view of the freezer 1 showing a cross section in a plane defined by the X-axis and the Z-axis and along the position indicated by the AA'line in FIG.
  • a freezing chamber 31 which is a space for cooling
  • the lower side of the freezing chamber 31, that is, the main body 11 side is surrounded by a cooler 32 made of a steel plate.
  • a heat exchanger connected to a condensing unit 33 including a compressor, a condenser, an expansion valve, etc. by a pipe is provided on the surface of the cooler 32 facing the surface on the freezing chamber 31 side. There is.
  • the heat exchanger absorbs heat from the cooler 32, and the condenser of the condensing unit 33 exhausts heat. As a result, the freezing chamber 31 is cooled.
  • the outside of the cooler 32 is covered with a heat insulating material 34 made of polyurethane foam resin, a vacuum panel, or the like. Further, the door 12 is filled with a heat insulating material 35 made of a foamed polyurethane resin, a vacuum panel, or the like. That is, the entire freezing chamber 31 is surrounded by the heat insulating material 34 and the heat insulating material 35.
  • a container 36 is provided in the freezing chamber 31 of the freezer 1.
  • the container 36 is made of a highly heat-conducting material such as stainless steel or a galvanized steel plate.
  • a liquid cooling medium 37 is stored in the container 36.
  • the container 36 is formed in a tank shape.
  • the container 36 may be in the shape of a hemispherical ball or may be provided with a lid, as long as it can store the liquid cooling medium 37.
  • the container 36 is removable from the freezing chamber 31 of the freezer 1.
  • the freezer 1 is not limited to the integrated freezer, and may be any one that can be cooled to a desired temperature, and may be composed of a stationary freezer unit, a condensining unit, and a separate showcase or a freezer warehouse. It may be a vertical or horizontal industrial freezer. Further, the freezer 1 may be of any cooling method, and has a reciprocating type (reciprocal type) or a rotary capacity compression type, a centrifugal type (turbo type), an absorption type, a turbo type using an air refrigeration cycle, and a Pelche effect. It can be the electronic refrigerator or magnetic refrigerator used.
  • the cooling medium 37 is stored in a container 36 in the freezer 1 and cooled, and is used in a liquid state for freezing the article by immersing the article.
  • the cooling medium 37 contains an aqueous ethanol solution, a powder obtained by crushing a product obtained by thermally decomposing plant seeds, and a water-soluble silicon compound.
  • the ethanol aqueous solution is a mixture of ethanol (ethyl alcohol) and water in a predetermined ratio. Ethanol can dissolve various organic substances and is relatively less toxic among monohydric alcohols. In addition, ethanol can be miscible with water in any proportion. In the aqueous ethanol solution, the concentration of ethanol can be any value, for example, 10% by weight to 90% by weight.
  • the freezing point of the aqueous ethanol solution alone is -45.4 degrees Celsius.
  • the powder mixed with the aqueous ethanol solution is made by crushing the product of pyrolysis of plant seeds.
  • plant seeds are legumes such as adzuki beans, soybeans, green beans, peas, cowpeas, broad beans, chick beans, lentils or peanut seeds.
  • Plant seeds are pyrolyzed in a semi-enclosed electric furnace at a temperature of 400 degrees Celsius or more and less than 500 degrees Celsius.
  • the product obtained by thermally decomposing plant seeds is pulverized by a pulverizer such as a ball mill into a powder having a representative value of 10 ⁇ m or less, which indicates the center of particle size distribution.
  • semi-sealed means a state in which the oxygen partial pressure is reduced compared to the atmospheric atmosphere.
  • semi-sealing refers to a state in which the firing space and the outside are communicated with each other through gaps or small holes so that replacement of the atmosphere inside the firing space with the outside air is suppressed, as in a charcoal kiln.
  • the seeds of the plant are heated and thermally decomposed in a state where oxidation or combustion is suppressed.
  • a product obtained by thermally decomposing the plant seeds can be obtained.
  • Bincho charcoal has a hardness comparable to that of metal because it is fired at a high temperature of about 1,000 degrees Celsius.
  • a product obtained by thermally decomposing plant seeds at a temperature of 400 degrees Celsius or more and less than 500 degrees Celsius is placed in a ball mill pot together with alumina balls and crushed by rotating the ball mill pot.
  • the powder obtained by grinding is sieved by a predetermined mesh.
  • FIG. 3 is a diagram showing a powder having a particle size of about 5 ⁇ m, taken at 10,000 times using a scanning electron microscope. It can be seen that the outer shape of the powder has no corners and is easily crushed. Further, the powder does not have fine pores.
  • FIG. 4 is a diagram showing an example of the result of component analysis of powder.
  • the ratio of the elements contained in the powder shown in FIG. 4 was determined by CHN elemental analysis (Elemental Analysis (Carbon, Hydrogen, Nitrogen)) and fluorescent X-ray analysis.
  • the powder obtained by crushing the product obtained by thermally decomposing the seeds of a plant, which is a small bean contains 66.5% by weight of carbon, 17.1% by weight of potassium, and 6.1% by weight.
  • Nitrogen 4.2% by weight hydrogen, 2.78% by weight phosphorus, 1.4% by weight calcium, 0.8% by weight magnesium, 0.5% by weight sulfur, 0.26% by weight It contains iron, 0.07% by weight zinc, 0.05% by weight manganese, 0.03% by weight silicon, 0.02% by weight aluminum and 0.01% by weight copper.
  • the product of pyrolyzing plant seeds at a temperature of 400 degrees Celsius or more and less than 500 degrees Celsius contains potassium and phosphorus, which results in hydrophilicity.
  • potassium is an alkali metal.
  • magnesium is contained in the product obtained by thermally decomposing plant seeds at a temperature of 400 degrees Celsius or more and less than 500 degrees Celsius. Magnesium produces alkaline water.
  • the product obtained by thermally decomposing beans can be pulverized relatively easily, and a powder having a value at the center of the particle size distribution of 10 ⁇ m or less can be easily obtained.
  • the powder obtained by grinding the product of pyrolysis of plant seeds produces a zeta potential of minus 0.5 mV in a solution at pH 7. Therefore, the powder obtained by crushing the product obtained by thermally decomposing the seeds of a plant causes a unique chemical reaction such as binding to a substance having a positive potential such as a protein. Further, the powder obtained by crushing the product obtained by thermally decomposing the seeds of a plant generates a zeta potential of minus 0.5 mV in a solution of pH 7, so that they repel each other and easily disperse.
  • the particle size distribution of the powder obtained by pyrolyzing the seeds of a plant, which is a small bean, at a temperature of 400 degrees Celsius or more and less than 500 degrees Celsius by crushing it with a crusher such as a ball mill was measured.
  • the particle size distribution of the powder was measured by using a laser diffraction type particle size distribution measuring device that irradiates the particle group with laser light and obtains the particle size distribution by calculation from the intensity distribution pattern of the diffraction / scattered light emitted from the particle group. ..
  • the measurement range of the laser diffraction type particle size distribution measuring device is from 0.05 ⁇ m to 3,000 ⁇ m. The number of measurements is four.
  • FIG. 5 is a diagram showing the particle size distribution of the powder measured by the volume relative particle size distribution and the number relative particle size distribution.
  • the horizontal axis of FIG. 5 indicates the particle size ( ⁇ m) in a logarithm, and the vertical axis indicates the relative particle amount (%).
  • the average particle size (average value) is 7.4 ⁇ m, and the mode is 8.5 ⁇ m.
  • the median is 8.491 ⁇ m.
  • the average deviation is 0.373.
  • the average value, mode value, and median value are examples of representative values indicating the center of the particle size distribution, respectively.
  • the powder obtained by crushing the product obtained by thermally decomposing the seeds of the plant is crushed until the representative value indicating the center of the particle size distribution becomes 10 ⁇ m or less.
  • the powder obtained by crushing the product obtained by thermally decomposing the seeds of a plant can be crushed until the representative value indicating the center of the particle size distribution becomes 3 ⁇ m or more.
  • FIG. 6 is a diagram showing a state when a powder obtained by crushing a product obtained by thermally decomposing plant seeds is mixed with an aqueous ethanol solution.
  • the powder obtained by crushing the product obtained by thermally decomposing plant seeds has high wettability and quickly precipitates in an aqueous ethanol solution.
  • FIG. 7 is a diagram showing a state of an ethanol aqueous solution mixed with powder when 24 hours have passed in a stationary state.
  • the left side in FIG. 7 shows a state in which a powder obtained by crushing a product obtained by thermally decomposing plant seeds is dispersed in an aqueous ethanol solution and left standing for 24 hours.
  • the right side in FIG. 7 shows a state in which a powder made by crushing general charcoal is dispersed in an aqueous ethanol solution and left standing for 24 hours.
  • the cooling medium 37 0.1% by weight to 1.0% by weight of powder is mixed with the aqueous ethanol solution. According to the experiment, when 0.1% by weight or more of the powder was mixed with the aqueous ethanol solution, a decrease in the freezing point of the cooling medium 37 was observed. Further, according to the experiment, it was confirmed that when a powder exceeding 1.0% by weight was mixed with the aqueous ethanol solution, the generation of aggregated precipitates increased. More preferably, in the cooling medium 37, 0.5% by weight to 1.0% by weight of the powder is mixed with the aqueous ethanol solution.
  • the water-soluble silicon compound contained in the cooling medium 37 is a slightly thick and transparent liquid.
  • the water-soluble silicon compound is a silicate.
  • a water-soluble silicon compound is produced by the following procedure.
  • High-purity silicon ore is calcined and gasified at a high temperature of about 1,600 degrees Celsius, and the gasified silicon component is recovered.
  • the recovered silicon becomes fine bead-shaped crystals.
  • the silicon crystals are heat-melted with a strong alkali or strong acid and liquefied.
  • an alkali e.g., sodium carbonate or sodium hydroxide
  • Sodium metasilicate is also known as the main component of hot springs. Since sodium metasilicate is a salt, it is solubilized. Liquefied hydrophilic silicon compounds are also soluble in water.
  • silicates including potassium silicate, calcium silicate or magnesium silicate
  • Silicates in detergents and soaps disperse dirt particles and prevent reattachment to clothing. It is widely known that silicate floats evenly in a liquid and moves.
  • Silica (SiO 2 ) is often used as an ion exchange substance, and hydrophilic silicon compounds also have electrical properties. Motility in a solution of a hydrophilic silicon compound is also evoked by electrical stimulation.
  • an inorganic silicon compound is preferable because its electrical characteristics are clear.
  • a water-soluble silicon compound In the cooling medium 37, 0.1% by weight to 1.0% by weight of a water-soluble silicon compound is mixed with the aqueous ethanol solution.
  • a water-soluble silicon compound when 0.1% by weight or more of a water-soluble silicon compound is mixed with an aqueous ethanol solution, it is suspended by mixing powders obtained by crushing the product obtained by thermally decomposing plant seeds. It was confirmed that it is effective in maintaining the state of. Further, according to the experiment, even if a water-soluble silicon compound exceeding 1.0% by weight was mixed with the ethanol aqueous solution, 1.0% by weight of the water-soluble silicon compound was mixed with the ethanol aqueous solution. There was no change in the maintenance of the case and suspension.
  • the cooling medium 37 0.1% by weight to 1.0% by weight of silicate is mixed with the aqueous ethanol solution. More preferably, in the cooling medium 37, 0.5% by weight to 1.0% by weight of the water-soluble silicon compound is mixed with the aqueous ethanol solution.
  • the water-soluble silicon compound contained in the cooling medium 37 disperses a powder obtained by crushing a product obtained by thermally decomposing plant seeds in an aqueous ethanol solution. Thereby, the water-soluble silicon compound suppresses the freezing of the cooling medium 37.
  • the freezing point of an aqueous ethanol solution having an ethanol concentration of 60% by weight is -45.4 degrees Celsius.
  • it is a powder obtained by crushing a product obtained by thermally decomposing plant seeds at 400 degrees Celsius or more and less than 500 degrees Celsius in an aqueous ethanol solution having an ethanol concentration of 60% by weight, and is 0.5 with respect to the aqueous ethanol solution.
  • 0.5% by weight to 1.0% by weight of powder is mixed with 0.5% by weight to 1.0% by weight of a water-soluble silicon compound with respect to an aqueous ethanol solution, the liquid phase is maintained at -60 degrees Celsius.
  • FIG. 8 is a flowchart showing a procedure for manufacturing a frozen product.
  • the goods to be frozen may be tangible items other than real estate.
  • the goods to be frozen can be of biological origin in plants or animals.
  • the goods to be frozen can be food, cosmetics or medical products.
  • cosmetics can contain placenta (a component extracted from the placenta), collagen or amino acids.
  • medical products are medicines or medical devices obtained by processing cells such as human stem cells, organs, teeth, blood, cells or tissues, or biological products.
  • an aqueous ethanol solution is placed in a container.
  • the concentration of ethanol in the aqueous ethanol solution can be arbitrary.
  • the concentration of ethanol in the aqueous ethanol solution can be less than 60% by weight.
  • the concentration of ethanol in the aqueous ethanol solution can be any of 10% by weight to 90% by weight.
  • the concentration of ethanol in the aqueous ethanol solution is as high as 60% by weight or more, and when cooling to a temperature higher than -60 degrees Celsius, the concentration of ethanol in the aqueous ethanol solution is It is lower, less than 60% by weight.
  • the container in which the ethanol aqueous solution is placed in step S11 may be the container 36 or another container.
  • the container 36 is removed from the freezing chamber 31 of the freezer 1, and the ethanol aqueous solution is put into the container 36 outside the freezer 1.
  • step S12 the powder produced by thermally decomposing the seeds at 400 degrees Celsius or more and less than 500 degrees Celsius and pulverizing the seeds is mixed with the ethanol aqueous solution contained in the container.
  • the powder for example, it is a powder obtained by crushing a product obtained by thermally decomposing plant seeds at 400 degrees Celsius or more and less than 500 degrees Celsius in an aqueous ethanol solution, and is 0.1% by weight to 1. 0% by weight of powder is mixed.
  • step S13 the water-soluble silicon compound is mixed with the ethanol aqueous solution contained in the container.
  • 0.1% by weight to 1.0% by weight of a water-soluble silicon compound is mixed with the aqueous ethanol solution.
  • step S14 an aqueous ethanol solution in which powder and a water-soluble silicon compound are mixed is placed in a container 36 in the freezer chamber 31 of the freezer 1.
  • the container 36 containing the aqueous ethanol solution in which the powder and the water-soluble silicon compound are mixed is inside the freezer chamber 31 of the freezer 1. Returned to.
  • the aqueous ethanol solution in which the powder and the water-soluble silicon compound are mixed is stored in the freezer. It is transferred to the container 36 in the freezing chamber 31 of 1.
  • step S15 the freezer 1 cools the aqueous ethanol solution in which the powder and the water-soluble silicon compound are mixed to a temperature lower than zero degrees Celsius.
  • a temperature lower than zero degrees Celsius For example, when the concentration of ethanol in the aqueous ethanol solution is 60% by weight, the freezer 1 cools the aqueous ethanol solution in which the powder and the water-soluble silicon compound are mixed to -60 degrees Celsius.
  • step S16 put the article to be frozen in a sealed container.
  • the article to be frozen is a food, cosmetic or medical article, it is a container formed of a plastic film or a metal foil or a multi-layered product thereof into a bag shape or other shape, and is heat-melted.
  • the article to be frozen is put in a sealed container (so-called pouch container) which is a container sealed by.
  • the sealed container is a container made of resin, metal, glass, or a combination thereof, which can be sealed so that the article to be frozen does not come into direct contact with the aqueous ethanol solution, and can withstand cooling to the temperature of the freezer chamber 31 of the freezer 1. It should be.
  • the article to be frozen may be in the form of a solid, a liquid, a sol or a gel.
  • step S17 the article placed in the sealed container is immersed in the cooled aqueous ethanol solution to freeze the article, and the procedure for manufacturing the frozen product is completed.
  • frozen products can be manufactured.
  • an aqueous ethanol solution By immersing in an aqueous ethanol solution, more heat is taken away in a shorter time, so that a frozen product can be produced faster.
  • the ethanol aqueous solution in which the powder and the water-soluble silicon compound are mixed does not solidify to a lower temperature as compared with the case of the ethanol aqueous solution alone, a frozen product can be produced even faster.
  • the ethanol aqueous solution in which the powder and the water-soluble silicon compound are mixed does not solidify to a lower temperature than the case of the ethanol aqueous solution alone, the deterioration of the frozen product can be further reduced, and more. It will be possible to store it for a long period of time.
  • aqueous ethanol solution with an ethanol concentration close to 60% by weight and less than 60% by weight of a non-dangerous substance is used, it is a non-dangerous substance and does not aggregate at -60 degrees Celsius, so that parasites are killed more safely. , The activity of the fungus can be suppressed.
  • the cooling medium 37 which is stored in the container 36 in the freezer 1 and cooled and used as a liquid for freezing the article by immersing the article, contains an aqueous ethanol solution and plant seeds at 400 ° C. or higher. It contains a powder obtained by crushing a product thermally decomposed at less than 500 degrees and a water-soluble silicon compound.
  • the hydrophilic powder becomes longer than the aqueous ethanol solution. Since the time-dispersed and the water-soluble silicon compound promotes the dispersion of the powder, the powder inhibits the coagulation of the aqueous ethanol solution and does not coagulate to a lower temperature than the case of the aqueous ethanol solution alone. , Will be able to be used at lower temperatures. This allows the article to be frozen faster.
  • a powder obtained by thermally decomposing plant seeds at 400 degrees Celsius or more and less than 500 degrees Celsius and crushing the product and a water-soluble silicon compound are mixed in an aqueous ethanol solution.
  • the proportion of ethanol can be reduced and it can be used more safely. Since the powder and water-soluble silicon compound obtained by crushing the product obtained by thermally decomposing plant seeds at 400 degrees Celsius or more and less than 500 degrees Celsius are both harmless to the human body, it is assumed that they adhere to the immersed article. Can be handled more safely. In this way, it is possible to suppress coagulation at a lower temperature and freeze the article more safely and faster.
  • the powder may be 0.1% by weight to 1.0% by weight with respect to the aqueous ethanol solution, and the water-soluble silicon compound may be 0.1% by weight to 1.0% by weight with respect to the aqueous ethanol solution. ..
  • the hydrophilic powder can be dispersed in the aqueous ethanol solution for a long time, and the water-soluble silicon compound can promote the dispersion of the powder.
  • the powder When the powder is dispersed in an aqueous ethanol solution, the powder can be kept in a suspended state for 24 hours or more in a stationary state. By doing so, the powder can inhibit the coagulation of the aqueous ethanol solution for a longer period of time even when it is allowed to stand.
  • the powder can have a representative value of 10 ⁇ m or less, which indicates the center of the particle size distribution. By doing so, the powder can be easily dispersed and the coagulation of the aqueous ethanol solution can be inhibited.
  • the powder can contain 15% by weight to 19% by weight of potassium and 1% by weight to 3% by weight of phosphorus. By doing so, the powder becomes hydrophilic and can be dispersed in the ethanol aqueous solution for a long time to inhibit the coagulation of the ethanol aqueous solution.
  • the powder can generate a zeta potential of minus 0.5 mV in a pH 7 solution. By doing so, the powders repel each other and are easily dispersed, and the coagulation of the aqueous ethanol solution can be inhibited.
  • the powder can be made by crushing a product obtained by thermally decomposing seeds, which are beans. By doing so, it is possible to more reliably obtain a powder having desired properties, suppress coagulation at a lower temperature, and freeze the article more safely and faster.
  • the ethanol aqueous solution can contain less than 60% by weight of ethanol. By doing so, the water-soluble ethanol is treated as a non-dangerous substance in the Fire Service Act, and more cooling media 37 can be handled more easily.
  • the freezer 1 can store the cooling medium 37 in the internal container 36. By suppressing the solidification of the cooling medium 37 at a lower temperature, the article can be frozen more safely and faster.
  • a powder obtained by crushing a product obtained by thermally decomposing plant seeds at 400 ° C. or higher and lower than 500 ° C. is mixed with an aqueous ethanol solution, and a water-soluble silicon compound is mixed with the aqueous ethanol solution.
  • Frozen product by cooling the aqueous ethanol solution mixed with the above to a temperature lower than 0 degrees Celsius in a liquid state, placing the article in a sealed container, and immersing the article in the sealed container in the cooled aqueous solution of ethanol to freeze it. Can be manufactured.

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Abstract

La présente invention permet à un article d'être congelé de façon plus sûre et plus rapide à une température inférieure, tout en supprimant la solidification. Ce procédé de production d'un article congelé consiste : à mélanger dans une solution aqueuse d'éthanol une poudre obtenue par broyage d'un produit issu de la décomposition thermique, à une température supérieure ou égale à 400 °C mais inférieure à 500 °C, d'une graine de plante ; à mélanger un composé de silicium soluble dans l'eau dans la solution aqueuse d'éthanol ; à refroidir à une température inférieure à 0 °C la solution aqueuse d'éthanol dans laquelle sont mélangés la poudre et le composé de silicium, tout en maintenant la solution aqueuse d'éthanol sous forme liquide ; et à placer un article dans un récipient hermétique et à immerger dans la solution aqueuse d'éthanol refroidie l'article stocké dans le récipient hermétique, ce qui permet de congeler l'article.
PCT/JP2021/017526 2020-05-13 2021-05-07 Milieu de refroidissement, congélateur et procédé de production d'un produit congelé WO2021230154A1 (fr)

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