JP2007015907A - Adsorbent charcoal, water-purifying agent, water-purifying sachet, water-purifying substrate and method for removing oil film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel adsorbent charcoal capable of efficiently removing oily components (oil film) when sprinkled on water surface, by floating on the water surface over a long period of time and staying in contact with the oily components (oil film) that are contained in and floating on the surface of natural water area such as rivers, lakes and seas, waste water such as industrial waste water, sewage, rainwater pools, etc., a water-purifying agent, a water-purifying sachet, a water-purifying substrate, and a method for removing the oil film. <P>SOLUTION: The adsorbent charcoal is obtained by using a coconut mesocarp as a raw material and subjecting it to heating and a carbonization treatment. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In particular, the present invention efficiently includes oil (oil film) that is contained in natural water areas such as rivers, lakes, and seas, waste water such as factory waste water, sewage, and rainwater ponds and that floats on the surface of the water. The present invention relates to a method for removing adsorbed charcoal, a water purification agent, a water purification bag, a water purification substrate, and an oil film for removal.

  Oil that has been accidentally spilled at gasoline stations, airfields, and military bases that handle fuel such as gasoline, light oil, kerosene, and jet fuel, and wastewater such as factory wastewater that contains organic solvents generated at various factories Are mixed into rainwater ponds, sewage, and wastewater even when handled with great care, and form a thin oil film that scatters and floats on the surface of the water, then flows out and then flows into natural waters such as rivers, lakes, and seas. The problem arises that the natural environment deteriorates.

  For this reason, means for removing such an oil film on the water surface have been researched and developed (for example, Patent Documents 1 to 5).

JP-A-8-182929 Japanese Utility Model Publication No. 6-85035 JP-A-6-170359 JP 2004-131855 A JP 2002-346380 A

  The oil film removing means described in these Patent Documents 1 to 5 uses a mat or sheet that adsorbs oil, but it takes time to adsorb oil by the mat or sheet, and a wide range on the water surface. In order to remove the oil film spread over a large area, it is necessary to lay a considerable number of mats and sheets, and there is a problem that a great deal of cost and labor are required.

  By the way, as a material capable of adsorbing and removing impurities in water, activated carbon is generally used because it is the simplest and most efficient.

  Activated carbon uses wood, sawdust, wood distillate, charcoal, coconut shell, lignin, etc. as raw materials (activated carbon raw material), and is heated and carbonized to increase its adsorption capacity for gases and pigments. Because of its relatively high and low-cost adsorption capacity for odorous components such as life odors and adsorbed components such as formalin, ethylbenzene or xylene such as VOC gas that cause sick house, water purification, refrigerators, etc. It is most widely used in the field of deodorizers for clogs or air purifier filters and other deodorant / adsorption products.

  Since activated carbon immediately after heating and carbonization treatment has a relatively low specific gravity, it can float on water. Therefore, if a large amount of such activated carbon is sprayed on the water surface on which an oil film is formed, the oil is adsorbed. It becomes possible to purify the water quality.

  However, since the adsorption characteristics by activated carbon have priority over adsorption by moisture over adsorption by oil, when activated carbon is sprayed on the water surface, moisture is absorbed in a short period of time, resulting in an increase in specific gravity. Since the activated carbon sinks below the surface of the water, the oil adsorption efficiency is very poor, and it is also necessary to collect the activated carbon that has submerged under the surface of the water while adsorbing the oil, resulting in great inconvenience.

  Therefore, as a result of intensive studies to solve the above problems, the present inventor has developed an adsorbed charcoal using coconut mesocarp as a raw material, which is heated and carbonized. .

  That is, when the inventor observed the coconut mesocarp (raw material) with an electron microscope, the mesocarp (raw material) had independent holes or independent holes and continuous holes integrated on the surface or inside thereof. Paying attention to the fact that a honeycomb structure in which countless pores are adjacent to each other by forming a complex network structure, heating and carbonization treatment is applied to the coconut mesocarp, and countless pores are adjacent to each other Since the adsorbed charcoal has a honeycomb structure, it becomes a carbonized material (adsorbed charcoal) having a specific gravity smaller than that of conventional activated carbon made from wood, sawdust, wood dry matter, charcoal, coconut shell or lignin. Obtained knowledge that if adsorbed charcoal made from mesocarp is sprayed on the surface of the water, even if some moisture is absorbed, it will remain floating on the surface of the water and can be in contact with the oil film on the surface for a long period of time. Is

  In addition, as described above, the adsorbed charcoal obtained using coconut mesocarp as a raw material has a complicated honeycomb structure in which independent holes and independent holes and continuous holes are integrated. Since the structure has a very wide range of sizes, we have also learned that it has excellent adsorbability for all kinds of oils.

  By the way, conventionally, coconut mesocarp has almost no utility value other than fiber components, and it has been discarded without being used at all, and raw materials can be procured at extremely low cost. In addition, they also learned that there are significant advantages from the viewpoint of waste utilization.

  The present invention has been completed based on the above knowledge, and when dispersed, floats on the water surface for a long period of time. As a result, natural water areas such as rivers, lakes, and seas, waste water such as factory waste water, sewage, and rainwater New adsorbed charcoal, water purification agent, which can efficiently remove the oil (oil film) because it is in contact with the oil (oil film) that is contained in the pond of the water and floats on the water surface for a long period of time. An object of the present invention is to provide a water purification bag, a water purification substrate, and a method for removing an oil film.

  In order to achieve the object, the adsorbed charcoal according to the present invention is characterized in that coconut mesocarp is used as a raw material, and the raw material is heated and carbonized.

  Here, the coconut palm has a three-layer structure of “endosperm” arranged at the center, “endocarp (palm gall)” consisting of a hard shell that wraps the outside, and “mesocarp” surrounding the inner pericarp. The endosperm is mainly used for food, and the inner pericarp (coconut shell) is used as a raw material for coconut shell activated carbon.

  On the other hand, as for the mesocarp, it is the present condition that it is discarded almost without being used except the fiber component.

  However, when the present inventors diligently studied the use of this coconut mesocarp, the coconut mesocarp has a complex honeycomb structure in which independent holes and independent holes and continuous holes are integrated, By heating and carbonizing the coconut skin of this coconut, an adsorbed charcoal with a complex honeycomb structure can be obtained. This adsorbed charcoal is made from wood, sawdust, wood dry distillate, charcoal, coconut shell or lignin. It became clear that it becomes a carbonized substance (adsorbed charcoal) with a smaller specific gravity than the conventional activated carbon.

  And if the adsorbed charcoal using coconut mesocarp as a raw material is sprayed on the surface of the water, it will float on the surface of the water even if it absorbs some water, and it will contact the oil (oil film) on the surface for a long time. It will be possible to continue. As a result, this adsorbed charcoal can adsorb and remove the aforementioned oil (oil film) efficiently.

  In addition, as described above, the adsorbed charcoal obtained using coconut mesocarp as a raw material has a complicated honeycomb structure in which independent holes and independent holes and continuous holes are integrated. The structure has a very wide range of sizes, so that it has excellent adsorptivity for all kinds of oils.

Moreover, as described above, coconut mesocarp has almost no utility value other than fiber components, and it is currently discarded without being used, and procurement of raw materials at extremely low cost. In addition, there is a great advantage from the viewpoint of waste utilization.
Hereinafter, the adsorbed coal of the present invention will be described in more detail.

  The adsorbed charcoal of the present invention is obtained by using coconut mesocarp as a raw material and heating and carbonizing the raw material.

  By the way, coconut mesocarp contains a fiber component, and in the adsorbed charcoal of the present invention, the mesocarp that contains the fiber component may be heated and carbonized. However, if the adsorbed charcoal contains a large amount of fiber components, the specific gravity of the adsorbed charcoal as a whole will increase. preferable.

  In the present invention, “heating and carbonizing” refers to a process of heating and carbonizing the raw material (coconut mesocarp). Is not particularly limited as long as the temperature can be carbonized, but in the case of the present invention, it is preferably in the range of 350 to 850 ° C., and if this heating and carbonization temperature is less than 350 ° C., the carbonization becomes insufficient. Oil (oil film) adsorbability is poor, while if it exceeds 850 ° C., the honeycomb structure described above may be destroyed, and it is not preferable from the viewpoint of energy saving.

  Further, in the present invention, for the purpose of further increasing the adsorption capacity, the raw material (coconut mesocarp) is heated, carbonized, and activated, or the raw material (coconut mesocarp) is heated and carbonized. It is preferable to carry out an activation treatment after the treatment.

  This activation treatment is the same as the treatment for increasing the adsorption capacity performed during the production of ordinary activated carbon, and is roughly divided into two types, a “gas activation method” and a “chemical activation method”.

  The former gas activation method is a general method often used industrially, and in the case of the present invention, the adsorbed charcoal described above is further in an atmosphere of water vapor, carbon dioxide, etc., particularly at a temperature of about 650 to 850 degrees. It is the method of processing with.

  On the other hand, in the case of the present invention, the latter chemical activation method is a method of impregnating the above-mentioned adsorbed charcoal with a treatment solution such as an aqueous zinc chloride solution, and in particular, performing carbonization and activation all at once under a temperature condition of about 350 to 700 ° C. It is.

  That is, in the present invention, which activation treatment is used is not particularly limited, but it has been found that by setting the activation treatment temperature slightly lower than usual, the adsorptive power to oil increases. Therefore, in the present invention, the activation treatment is preferably performed at a relatively low temperature of about 350 to 850 ° C, more preferably about 400 to 850 ° C.

  As described above, when the adsorbed charcoal is processed at a relatively low temperature, the adsorption capacity increases. When the adsorbed charcoal is processed at a relatively low temperature, the honeycomb structure of the raw material (coconut peel) remains as it is. On the other hand, it is understood that the above-described honeycomb structure may be destroyed when the high temperature treatment is performed.

  The adsorbed charcoal of the present invention may be used as it is, that is, in a powder state. However, in order to facilitate the subsequent recovery / regeneration work, it is usually in the form of particles, plates, disks, etc. It may be formed into an arbitrary shape such as a pellet, tablet or tablet and used.

  Here, in processing the adsorbed charcoal of the present invention into an arbitrary shape, for example, a means for adhering and fixing the adsorbed charcoal via a binder may be used. The mold is filled with adsorbed charcoal and powdered or granular hot-melt resin, and water vapor is passed from one of the fillers to the other, so that the hot-melt resin is melted by the heat of water vapor and adhesion is improved. It is preferable to use a means for expressing and processing the adsorbed charcoal into a predetermined shape.

  The reason for this is that if a means for adsorbing adsorbed charcoal via a binder is used, it takes a relatively long time to dry the binder, and most of the adsorbed charcoal is buried in the binder, impairing its adsorption characteristics. This is because there is a case where the hot melt resin is filled by adsorbing charcoal and hot melt resin into a mold having a desired shape and passing water vapor from one of the fillers to the other. By using the above-mentioned means for forming and fixing the adsorbed charcoal in a predetermined shape by causing the heat of the steam to melt and exhibit adhesiveness, the adsorbed charcoal can be formed and fixed in a predetermined shape in a short time and also passes through the water vapor. This is because it is possible to limit as much as possible that the adsorbed charcoal is buried in the resin, so that the activity of the adsorbed charcoal can be maintained.

  The hot melt resin is not particularly limited as long as it exhibits adhesiveness by being treated with the heat of water vapor. Specifically, for example, a polyolefin resin such as polyethylene or polypropylene is used. , Ethylene-vinyl acetate copolymer, polystyrene, polyisobutylene, polyamide resin or polyester resin, at least one selected from the group consisting of polyethylene and ethylene-vinyl acetate copolymers at relatively low temperatures. It is desirable because it melts to exhibit adhesiveness and is inexpensive.

  The water purification agent of the present invention is characterized by comprising the adsorbed charcoal of the present invention as a main component, natural water areas such as rivers, lakes and seas, waste water such as factory waste water, sewage, rainwater When sprayed in a pond, etc., it floats on the water surface for a long period of time. As a result, the oil component (oil film) floating on the water surface and the water purification agent remain in contact with each other for a long period of time. It can be removed.

  Here, “main component” means that when adsorbed charcoal is used as a water purification agent, the oil adsorbing action of adsorbed charcoal is impaired in addition to the case where the water purification agent is formed only of adsorbed charcoal. It means that other functional materials may be blended in a proportion not present. Examples of other functional materials include commonly used adsorbents such as ordinary activated carbon and zeolite, fiber products such as cotton fabric for improving oil absorption performance, and foaming agents. In this case, generally, it is preferable that the mixing ratio of the adsorbed charcoal with respect to the whole water purification agent is about 60% by weight or more. In particular, it is most desirable to produce a water purification agent using only adsorbed charcoal.

  The water purification bag of the present invention is characterized in that the adsorbed charcoal of the present invention is enclosed in a bag material, which improves the handling properties such as the transportability and portability of the adsorbed charcoal and the recoverability. .

  The bag material is not particularly limited as long as it has liquid permeability and does not easily leak the enclosed adsorbed charcoal. For example, non-woven fabric, work cloth, woven fabric, paper product, polymer Examples thereof include a film or sheet made of a material, which has been subjected to perforation treatment or the like, and a liquid-permeable film or sheet formed into a bag shape.

  On the other hand, the water purification substrate of the present invention is characterized in that the adsorbed charcoal of the present invention is supported on a carrier, and this also handles the adsorbed charcoal in terms of transportability, portability and recoverability. Is an improvement.

  Here, as a method for supporting the adsorbed charcoal of the present invention on a carrier, first, adsorbed charcoal is mixed with a binder, and the adsorbed charcoal is adsorbed on the surface of the carrier by applying this mixture to an arbitrarily selected carrier. A means for carrying can be mentioned.

  However, the means for adsorbing the adsorbed charcoal to the carrier via the binder is advantageous in that the adsorbed charcoal can be easily carried on the carrier regardless of the material, shape, properties, etc. of the carrier, When this means is used, it takes a relatively long time to dry the binder, and most of the adsorbed charcoal is buried in the binder, which may impair the adsorption characteristics.

  Therefore, in the water purification substrate of the present invention, it is preferable to take the following means for supporting the adsorbed charcoal on the support.

  First, in the water purification substrate of the present invention, as one of preferable methods for supporting the adsorbed charcoal on the support without damaging the adsorption characteristics of the adsorbed charcoal as much as possible, using a fiber product as the support, A means for supporting adsorbed charcoal in the fiber network can be mentioned.

  That is, in the water purification substrate of the present invention, when adsorbing charcoal is supported on the carrier, the adsorbed charcoal is adsorbed in the fiber network of the fiber product as a fiber product or carrier without using an adhesive means such as a binder. If supported, the supported adsorbed charcoal can always maintain an active state.

  The fiber product is not particularly limited as long as it can support the adsorbed charcoal in the fiber net. For example, when the fabric is made of natural fiber and / or artificial fiber, towel fabric, blanket, Examples thereof include cloth base materials such as knitted fabrics, non-woven fabrics and non-woven fabrics, paper made of pulp fibers, and pulp molds.

  However, in the means for supporting the adsorbed charcoal in the fiber net of the textile product, there may be a problem that the adsorbed charcoal leaks or falls off or the amount of adsorbed charcoal to be carried decreases.

  With respect to this point, in the water purification substrate of the present invention, as one of other preferable methods for supporting the adsorbed charcoal on the carrier, a film or sheet substrate having a liquid permeability and a covering material are supported on the carrier. The adsorbed charcoal is laminated on the base material, and the base material and the covering material are partially adhered by covering with the covering material from above, and the base material and the covering material are interposed between them. A means for supporting adsorbed charcoal can be mentioned.

  Further, when the adsorbed charcoal is supported on the carrier, the adsorbed charcoal and the powdery or granular hot-melt resin are laminated on the film-like or sheet-like substrate having liquid permeability, and further from above, the above-mentioned A laminate is formed by covering with a covering material, and then water vapor is passed in the thickness direction of the laminate, whereby the hot melt resin is melted by the heat of water vapor to exhibit adhesiveness, and the base material And a means for supporting the adsorbed charcoal between the coating material and the covering material, and by configuring in this way, the adsorbed charcoal is prevented from leaking or falling off, and the amount of adsorbed charcoal to be sandwiched is appropriately adjusted. It can be done.

  Further, in this method, in particular, by passing water vapor in the thickness direction of the laminate, the hot melt resin is melted by the heat of water vapor to develop adhesiveness, and the base material and the coating material are obtained. By adsorbing the adsorbed charcoal between the adsorbent charcoal, the adsorbed charcoal can be fixed in a short time without impairing the air permeability and flexibility, and the adsorption of the adsorbed charcoal in the resin is limited as much as possible. The activity of can be maintained.

  In addition, as the base material and the covering material, for example, a cloth body made of natural fibers and / or artificial fibers can be mentioned, and as the cloth body made of natural fibers and / or artificial fibers, in general, Examples thereof include cloth, towel cloth, blanket, quilt, knitting, paper, non-woven cloth, and woven cloth.

  In addition, in the water purification substrate of the present invention, one preferred method for supporting the adsorbed charcoal on the support is to use a foamed plastic as the support and a means for supporting the adsorbed charcoal in the foamed plastic. it can.

  Here, “foamed plastic” refers to polystyrene, polyurethane, ABS resin, polyvinyl chloride, polyethylene, polypropylene, phenol resin, urea resin, epoxy resin, silicon resin, etc. as a base polymer, and various foaming means [for example, (1) Addition of volatile liquid or decomposable foaming agent, (2) Blowing in air or nitrogen, (3) Foaming by spraying, (4) Utilization of reaction product gas, etc.] It refers to a product formed as a highly foamed product exceeding 100 times from a low foamed product of about 10 times, and as a result, an infinite number of pore networks are formed in the foamed plastic.

  That is, when the adsorbed charcoal is supported on the carrier, the adsorbed charcoal is retained in the network of innumerable pores by supporting the adsorbed charcoal in the foamed plastic with the foamed plastic as a carrier. The burying of the adsorbed charcoal in the resin is limited as much as possible and the activity of the adsorbed charcoal can be maintained.

  Here, the means for supporting the adsorbed charcoal in the foamed plastic is not particularly limited, but specifically, for example, a foamable bead in which pentane or freon is infiltrated into the plastic bead made of the aforementioned base polymer. And adsorbed charcoal, and after filling the mixture into a predetermined mold, heating and foaming can be used.

  As described above, in the water purification substrate of the present invention, there is an advantage that the handling property such as the transportability and portability of the adsorbed charcoal and the recoverability are improved, but by supporting the adsorbed charcoal on the carrier. In use, widespread diffusion of adsorbed charcoal on the water surface may be hindered.

  Therefore, in the case where a wide diffusion of adsorbed charcoal on the water surface is required for the water purification substrate of the present invention, the carrier in the water purification substrate of the present invention may be, for example, tissue paper or It is preferable to disperse the adsorbed charcoal quickly using a water-soluble or water-decomposable material that easily melts or tears when touching water, such as toilet paper.

  The oil film removal method of the present invention is characterized in that the oil film floating on the water surface is removed using the water purification agent, water purification bag, and water purification substrate of the present invention. Efficiency of oil (oil film) that floats on the surface of water by spraying water purification agents on natural waters such as rivers, lakes, and seas, wastewater such as factory wastewater, sewage, and rainwater reservoirs It can be removed well.

  The present invention has the above-described configuration, and is contained in natural water areas such as rivers, lakes, and seas, waste water such as factory waste water, sewage, and rainwater reservoirs, and the like (oil film) that exists in a floating state on the water surface. ) Is an adsorptive charcoal for efficient removal.

  That is, the adsorbed charcoal of the present invention forms a complex network structure in which independent holes or independent holes and continuous holes are integrated, and has a honeycomb structure in which countless number of pores are adjacent to each other. It is obtained by heating and carbonizing this coconut mesocarp, using mesocarp as a raw material, and this adsorbed charcoal is a carbonized material having a specific gravity smaller than that of conventional activated carbon. Therefore, the water quality of the present invention If the purifier is sprayed on the water surface, it will continue to float on the water surface even if it absorbs some moisture, and can be kept in contact with the oil (oil film) on the water surface for a long period of time. The effect of being able to remove efficiently is produced.

  In addition, as described above, the adsorbed charcoal obtained using coconut mesocarp as a raw material has a complicated honeycomb structure in which independent pores or independent pores and continuous pores are integrated. The structure has a very wide range of sizes, and as a result, there are effects such as excellent adsorptivity to all kinds of oils.

  Moreover, coconut mesocarp has almost no utility value other than fiber components, and it is currently being discarded without being used almost at all, making it possible to procure stable raw materials at extremely low cost. There is also a great advantage from the viewpoint of waste utilization.

  The water purification agent of the present invention is characterized by comprising the adsorbed charcoal of the present invention as a main component, natural water areas such as rivers, lakes, and seas, waste water such as factory waste water, sewage, and rainwater. By spraying in a reservoir, etc., as a result of floating on the surface of water for a long time, the oil (oil film) existing in a floating state is contacted for a long time, so that the oil (oil film) can be efficiently removed. There are effects such as.

  Further, the water purification bag of the present invention is characterized in that the adsorbed charcoal of the present invention is sealed in a bag material, and the handleability of the adsorbed charcoal, such as transportability, portability and recoverability, is remarkably improved. It has the effect of doing.

  Furthermore, the water purification substrate of the present invention is characterized in that the adsorbed charcoal of the present invention is supported on a carrier, and the handling properties such as the transportability and portability of the adsorbed charcoal and the recoverability are remarkably high. There are effects such as improvement.

  The method for removing an oil film of the present invention is characterized by removing oil (oil film) floating on the water surface using the water purification agent, water purification bag or water purification substrate of the present invention, By spraying the water purification agent, water purification bag or water purification substrate of the present invention on natural water areas such as the sea, lakes and rivers, waste water such as factory waste water, sewage, rainwater reservoirs, etc., on the surface of the water As a result of floating for a long period of time, the oil (oil film) existing in a floating state is brought into contact for a long period of time, so that the oil (oil film) can be efficiently removed.

Best Mode for Carrying Out the Invention

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be specifically described below, but the present invention is not limited to the following examples.

  Wash the coconut skin with water, dry the fiber component to a certain extent, heat it at a temperature of about 550 ° C, and in a reddish state, steam, carbon dioxide (CO2 in the combustion gas) and oxygen (combustion air) The adsorbed carbon powder of the present invention was obtained by heating and carbonizing at a temperature of about 600 ° C. in a mixed atmosphere of O2).

Comparative Example 1

  The activated carbon raw material from which the coconut shell (coconut skin) is dried and fine powder is removed is heated at a temperature of about 800 ° C, and in a red-hot state, water vapor, carbon dioxide (CO2 in the combustion gas) and oxygen (O2 in the combustion air) ) Was activated at a temperature of about 900 ° C. to obtain activated carbon powder.

<Comparison test>
Three rectangular stainless steel pallets of 20 cm in length, 15 cm in width, and 15 cm in height are prepared, and 3000 ml of tap water is placed in each of these three rectangular stainless steel pallets, and a burette is placed on the water surface of each of these rectangular stainless steel pallets. After dripping 5 ml of light oil and diffusing the light oil on the water surface, 15 g of the adsorbed charcoal powder obtained in Example 1 was sprayed and diffused on the water surface, respectively, and allowed to stand overnight.

  Similarly, prepare 3 square stainless steel pallets 20cm long, 15cm wide and 15cm high, put 3000ml of tap water in each of these 3 square stainless steel pallets, and put on the water surface of each square stainless steel pallet. After 1.5 ml of light oil was dropped onto the water surface using a burette, 15 g of the activated carbon powder obtained in Comparative Example 1 was sprayed and diffused on the water surface, and allowed to stand overnight.

Furthermore, as a reference example, one rectangular stainless steel pallet similar to that used in Example 1 and Comparative Example 1 was prepared, and into this, as in Example 1 and Comparative Example 1, 3000 ml of tap water was added. After 1.5 ml of light oil was dropped on the water surface of each square stainless steel pallet with a burette to diffuse the light oil on the water surface, the pallet was allowed to stand for 24 hours.
That is, in this reference example, no oil adsorbent was sprayed.

  After a day and night, the state of each square stainless steel pallet was confirmed. As a result, the adsorbed charcoal powder dispersed in Example 3 was still floating on the water surface. It was confirmed that almost all of the activated carbon was submerged below the surface of the water in which the activated carbon powder according to Comparative Example 1 was dispersed, and that the light oil film remained on the surface of the water. .

  Moreover, about the thing of Example 1 and the comparative example 1, adsorption charcoal and activated carbon were each taken out from each square stainless steel pallet, and the state of the light oil film in each said square stainless steel pallet was confirmed visually.

  As a result, it was recognized that the oil oil film disappeared and the oil (light oil) content could not be confirmed for the sprayed adsorbed charcoal powder according to Example 1.

  On the other hand, about what sprinkled the activated carbon which concerns on a comparative example, as mentioned above, it was confirmed that the light oil film remains on the water surface.

  Furthermore, in the case of the reference example, the light oil film survived as it was, and no change was observed.

<Creation of columnar adsorbed charcoal>
FIGS. 1-4 is a schematic diagram which shows the process of processing the adsorption charcoal (powder) 1 of this invention into a columnar adsorption charcoal.

  As shown in FIGS. 1 and 2, in this embodiment, first, adsorbed charcoal 1 and powdery or granular hot-melt resin (ethylene-vinyl acetate copolymer) 2 are placed in a specific-shaped mold 5. Fill to form fill M.

  Here, when the adsorbed charcoal 1 and the powdery or granular ethylene-vinyl acetate copolymer 2 are filled in the mold 5 having a specific shape, the adsorbed charcoal 1 and the ethylene-vinyl acetate copolymer 2 are individually laminated. In this embodiment, the mixture is filled with adsorbed charcoal 1 and ethylene-vinyl acetate copolymer 2 (adsorbed charcoal 8: ethylene-vinyl acetate copolymer 2 by volume). .

  In addition, as the mold 5 having a specific shape in the present embodiment, a cylindrical shape is used in the present embodiment, but the shape is not particularly limited, and a mold having an arbitrary shape can be mentioned.

  The material constituting the mold 5 of the specific shape is not particularly limited as long as it is not easily melted or broken when treated with the water vapor S. Generally, wood or bamboo is used. A natural material such as stainless steel, a metal material such as stainless steel, a heat-resistant polymer material, or a pottery or ceramic material can be suitably used.

  In more detail, as shown in FIG. 4, in this embodiment, the cylindrical stainless steel mold (diameter 2 cm, height 3 cm) 5 has a water vapor inflow portion for feeding water vapor S to the entire upper surface. 6 and the bottom surface of the cylindrical mold are provided with a water vapor outflow portion 7 through which the water vapor S flows out, and the water vapor S can be sucked from the water vapor outflow portion 7.

  In this embodiment, before filling the adsorbed charcoal 1 and the powdery or granular ethylene-vinyl acetate copolymer 2, the bottom surface of the cylindrical stainless steel mold 5 is used to prevent these components from spilling out. The whole is covered with the cloth body 8.

  In this embodiment, as shown in FIGS. 3 and 4, by passing the steam S through the filler M filled in the stainless steel mold 5 from the steam inlet 6 to the steam outlet 7, The ethylene-vinyl acetate copolymer 2 is melted by the heat of the water vapor S to develop adhesiveness, so that the adsorbed charcoal 12 can be formed in a cylindrical shape.

  In this case, a pipe-shaped water vapor inflow portion 6 into which the water vapor S generated from a water vapor generator (not shown) flows into the processing chamber and a pipe-shaped water vapor outflow portion 7 through which the water vapor S flows out are respectively provided. It is provided on the side surface of the processing chamber and is configured such that the water vapor S can be sucked from the water vapor outflow portion 7.

  When the same test as in Example 1 was performed using the obtained cylindrical body, it was found that this cylindrical body was porous and floated on the water surface and efficiently adsorbed the light oil film on the water surface. After use, it was confirmed that the recoverability of this cylindrical body was remarkably excellent.

<Creation of water purification substrate>
FIG.5 and FIG.6 is a schematic diagram which shows the process of processing the adsorbed charcoal (powder) 1 of this invention into a sheet-like water purification substrate.

  As shown in FIG. 5, in this example, first, the adsorbed charcoal 1 and the powdery or granular ethylene-vinyl acetate copolymer 2 are sprayed and laminated on the cloth base material 3. A laminated body is formed by covering with a cloth covering material 4 from above.

  Here, on the base material 3, the adsorbed charcoal 1 and the ethylene-vinyl acetate copolymer 2 are separately sprayed and laminated in order to spread and laminate the mixture of the adsorbed charcoal 1 and the ethylene-vinyl acetate copolymer 2. Alternatively, a mixture of adsorbed charcoal 1 and ethylene-vinyl acetate copolymer 2 may be sprayed and laminated. In this embodiment, adsorbed charcoal 1 and ethylene-vinyl acetate copolymer 2 The mixture (adsorbed charcoal 8: ethylene-vinyl acetate copolymer 2 by volume ratio) is sprayed and laminated.

And in a present Example, as shown in FIG. 6, by making the water vapor | steam S pass through the thickness direction of the said laminated body, for example, toward the base material 3 direction from the coating | covering material 4, it is the said heat | fever with the heat | fever of the said water vapor | steam S. The ethylene-vinyl acetate copolymer 3 is melted to exhibit adhesiveness, and the adsorbed charcoal 1 is fixed between the base material 3 and the covering material 4 to obtain a laminate (vertical 90 cm, horizontal 35 cm). It was.
The obtained laminate was cut into a length of 15 cm and a width of 15 cm to obtain a laminate piece.

  When the same test as in Example 1 was performed using the obtained laminate piece, it was found that this laminate piece was porous and floated on the water surface and efficiently adsorbed the light oil film on the water surface. Also, after use, it was recognized that the recoverability of this laminate piece was remarkably excellent.

<Creation of water purification substrate>
FIGS. 7 to 8 are schematic views showing a process of processing the adsorbed charcoal (powder) 1 of the present invention into a water purification substrate supported on a foamed plastic carrier.

  As shown in FIG. 7, in this example, first, the mold 5 having a specific shape is filled with expandable beads 9 in which about 5% of pentane is infiltrated into polystyrene beads and the adsorbed charcoal 1 of the present invention. A filling is formed.

  In addition, although the rectangular parallelepiped type | mold is used as the type | mold 5 of the specific shape in a present Example, the shape is not specifically limited, The type | mold of arbitrary shapes can be used.

  Further, the material constituting the mold 5 of the specific shape is not particularly limited as long as it does not easily melt or break during the heat treatment (foaming treatment) described later. Is made of aluminum and has a rectangular parallelepiped shape having a length of 2.5 cm, a width of 5 cm, and a height of 2.5 cm, and is provided with a large number of small holes 51 around it.

  Next, after pre-foaming the filler filled with the mixture of the expandable beads 9 and the adsorbed charcoal 1 of the present invention, the mixture shown in FIG. 8 is heated at a processing temperature of about 110 to 120 ° C. The water purification substrate of the invention was obtained.

  When the same test as in Example 1 was carried out using the obtained water purification substrate, it was found that this water purification substrate was porous and floated on the water surface, and efficiently adsorbed the light oil film on the water surface. Moreover, after use, it was recognized that the recoverability of this water purification substrate is remarkably excellent.

FIG. 1 is a schematic view showing a step of introducing a mixture of adsorbed charcoal and ethylene-vinyl acetate copolymer into a mold having a specific shape in the production process of the water purification agent of Example 2. FIG. 2 is a schematic diagram showing a state in which a mixture of adsorbed charcoal and ethylene-vinyl acetate copolymer is filled in a mold having a specific shape in the production process of the water purification agent of Example 2. FIG. 3 is a schematic view showing a state in which water vapor passes through the mold filling in the production process of the water purification agent of Example 2. FIG. 4 is a schematic view showing a water vapor passage device suitably used in the production process of the water purification agent of Example 2. FIG. 5 is a schematic view showing a step of laminating a mixture of adsorbed charcoal and ethylene-vinyl acetate copolymer between the base material and the covering material in the manufacturing process of the water purification base material of Example 3. FIG. 6 is a schematic diagram illustrating a state in which water vapor is passed through the laminate in the manufacturing process of the water purification substrate of Example 3. FIG. 7 is a schematic diagram showing a step of feeding a mixture of adsorbed charcoal and foamed beads into a mold having a specific shape in the water purification substrate manufacturing process of Example 4. FIG. 8 is a perspective view showing a water purification substrate of Example 4.

Explanation of symbols

1 Adsorbed charcoal 2 Hot melt resin (ethylene-vinyl acetate copolymer)
DESCRIPTION OF SYMBOLS 3 Base material 4 Coating | covering material 5 Mold of specific shape 6 Water vapor | steam inflow part 7 Water vapor | steam outflow part 8 Cloth body 9 Expandable bead

Claims (17)

  Adsorbed charcoal, which is formed by using coconut mesocarp as a raw material and heating and carbonizing the raw material.   The adsorbed charcoal according to claim 1, wherein a raw material obtained by removing a fiber component from coconut mesocarp is used.   The adsorption charcoal according to claim 1 or 2 whose processing temperature in heating and carbonization processing is the range of 350-850 ° C.   The adsorbed charcoal according to any one of claims 1 to 3, wherein an activation treatment is performed together with the heating and carbonization treatment.   The adsorbed charcoal according to any one of claims 1 to 3, wherein an activation treatment is performed after the heating and carbonization treatment.   The adsorption charcoal according to claim 4 or 5 whose processing temperature in activation processing is the range of 350-850 ° C.   The adsorbed charcoal in which the adsorbed charcoal according to any one of claims 1 to 6 is formed into an arbitrary shape such as a granular shape, a pellet shape, a tablet shape, or a tablet shape.   In processing the adsorbed charcoal into an arbitrary shape, by filling the mold of the target shape with adsorbed charcoal and powdered or granular hot melt resin, by passing water vapor from one of the packing to the other, The adsorptive charcoal according to claim 7, wherein the hot-melt resin is melted by heat of water vapor to develop adhesiveness, and the adsorbed charcoal is processed into a predetermined shape.   A water purification agent comprising the adsorbed charcoal according to any one of claims 1 to 8 as a main component.   A water purification bag comprising the adsorbed charcoal according to any one of claims 1 to 8 enclosed in a bag material.   A water quality purification substrate comprising the adsorbed charcoal according to any one of claims 1 to 8 supported on a carrier.   The water purification substrate according to claim 11, wherein the adsorbed charcoal is mixed with a binder and the adsorbed charcoal is supported on the surface of the support by applying the mixture to the support.   The water purification substrate according to claim 11, wherein the carrier is a fiber product, and adsorbed charcoal is supported in a fiber net of the fiber product.   The carrier is composed of a film-like or sheet-like base material having a liquid permeability and a coating material, and adsorbed charcoal and a powdery or granular hot-melt resin are laminated on the base material, and further from above, the above-mentioned A laminate is formed by covering with a covering material, and then water vapor is passed in the thickness direction of the laminate, whereby the hot melt resin is melted by the heat of water vapor to exhibit adhesiveness, and the base material The water purification substrate according to claim 11, wherein adsorbed charcoal is supported between the water and the covering material.   The water purification substrate according to claim 11, wherein the support is foamed plastic, and adsorbed charcoal is supported in the foamed plastic.   The water purification substrate according to any one of claims 11 to 15, wherein the carrier has water solubility or water decomposability.   An oil film floating on the water surface is removed using the water purification agent according to claim 9, the water purification bag according to claim 10, or the water purification substrate according to any one of claims 11 to 16. A method for removing an oil film.

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