JP2008272600A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter having prescribed purging capability by filtration and adsorption even without the decline of a filtration speed due to the increase of the pressure loss of oil when the oil passes through, without the leakage of the oil with the need of high fitting property to be fitted to the prescribed position of a container for oil filtration and without exchange and discarding while a filter medium and an adsorbent are not sufficiently used. <P>SOLUTION: The filter mainly comprises a powdered adsorbent, a deoxidizer, a binder for binding and holding the adsorbent and the deoxidizer, and fibers as the filter medium. The fibers are formed in a bag shape which is opened upwards and narrowed downwards and the adsorbent and the deoxidizer are deposited to the fibers to form a unit filter, and the plurality of unit filters are vertically piled up and laminated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter for filtering and purifying used cooking oil.

  In order to purify used cooking oil by filtration, a filter having an adsorbent such as activated carbon is generally used. The adsorbent is a filter that adsorbs and filters the contaminants contained in the liquid or gas (simply referred to as the purification target) containing the contaminants to be purified, and is formed by binding granular or powdery adsorbents with a binder. (For example, Patent Document 1). Moreover, by providing a deoxidizer with an adsorbent, the oil oxidized by the deoxidizer can be deoxidized to regenerate the oil.

  A conventional filter is generally composed of a filter medium made of fibers and an adsorbent such as activated carbon, as shown in Patent Document 1, and is formed by tightly integrating these into an oil filtration container. Installed to filter oil. As shown in FIG. 4, the filter 2 ′ shown in Patent Document 1 has a thickness of about 10 to 50 mm and is formed into a lump shape having a circular shape, a rectangular shape, or other shapes in plan view. The container 3 'is installed in a predetermined position 31'. And by passing used edible oil from above, impurities in the used edible oil are filtered and removed by the filter medium made of fibers, and fine particles and odor components that could not be removed by the filter medium Etc. are adsorbed with an adsorbent to remove used edible oil.

  And as above-mentioned, in order for the filter to have the predetermined purification capability by filtration and adsorption | suction, the length of the part through which oil passes, ie, the thickness, needed to be more than fixed thickness.

  Since such a conventional filter has an integral shape having a thickness of a certain degree or more as described above, the pressure loss of the oil when the oil passes increases, and the filtration speed decreases. The oil to be passed needs to pass through the filter, but the area of the filter passing surface, that is, the area in plan view is limited, so the passing area becomes narrow, and this also reduces the filtration rate There was a problem.

  In addition, since the filter has an integral shape with a certain thickness or more and is fitted into a predetermined position 31 ′ of the oil filtration container 3 ′, the fitting portion of the oil filtration container 3 ′ is fitted to the filter. When the fitting property is poor, there is a problem that oil may leak from the gap between the oil filtration container 3 'and the filter and the filtration may not be performed. It was.

Also, the filter accumulates more impurities filtered from the used oil, adsorbed fine particles and odorous components in the upstream side through which the oil passes, that is, the upper side. It is necessary to exchange before fine particles and odorous components are no longer adsorbed. However, at the time of replacement, the filtration of impurities and adsorption of fine particles and odorous components are not performed to the limit in the downstream part of the filter, and the filter medium and adsorbent of this part are not yet fully used. There is a problem that it is exchanged and discarded, resulting in waste.
Japanese Patent Laying-Open No. 2005-238094

  The present invention has been made in view of the above points. The purpose of the present invention is to increase the pressure loss of the oil when the oil passes through it and reduce the filtration rate, or to a container for oil filtration. The oil does not leak due to the high fit required to fit in the specified position, or the filter medium and the adsorbent are not replaced and discarded without being fully used. However, the present invention provides a filter having a predetermined purification ability by filtration and adsorption.

  In order to solve the above-mentioned problems, the invention according to claim 1 is mainly composed of a powdery adsorbent and a deoxidizer, a binder that binds and holds the adsorbent and the deoxidizer, and fibers 1 as a filter medium. The fiber 2 is formed in a bag shape that opens upward and has a smaller diameter as it goes downward, and the fiber 1 is loaded with an adsorbent and a deoxidizing agent to form a unit filter 2a. A plurality of unit filters 2a are stacked and stacked one above the other.

  By adopting such a configuration, the pressure loss in each unit filter 2a is reduced, the filtration speed is improved, and it is necessary to fit into a predetermined position of a container for oil filtration as in the past to install the filter 2 In addition, there is no risk of oil leaking due to a large filtration area, and it is possible to eliminate waste that the filter medium and the adsorbent are replaced without being sufficiently used.

  In the present invention, the filtration rate is improved, there is no risk of oil leaking, and waste such as replacement without using the filter medium and the adsorbent sufficiently can be eliminated.

  The present invention will be described based on an embodiment. A stack-type oil filtration filter (hereinafter simply referred to as filter 2) based on the premise of stacking according to the present invention is a combination of a powdery adsorbent and a deoxidizer, and the adsorbent and deoxidizer. The main body is composed of the binder to be held and the fibers 1 as a filter medium.

  Examples of the adsorbent include zeolite, amorphous silica, bentonite, activated alumina, activated clay and the like, and these can be used alone or in combination of two or more according to the intended use. The preferred adsorbent for oil decolorization is activated carbon.

  As the activated carbon, in addition to bamboo activated carbon, for example, other plant activated carbon (for example, activated carbon made from coconut shell, wood flour, raw ash, etc.), mineral activated carbon (for example, peat charcoal, leki charcoal, pitch, coke, etc.) Activated carbon used as a raw material), resin-based activated carbon (for example, activated carbon using phenol resin, acrylic resin, etc. as a raw material), and the like. These can be used alone or in combination of two or more.

  The specific surface area of the adsorbent is about 300 to 3000 m 2 / g (preferably 700 to 2500 m 2 / g), and the average pore diameter is about 1 to 100 mm (preferably 5 to 20 mm) depending on the contaminant to be adsorbed. To do. Note that 1Å = 0.1 nm.

  This adsorbent is in the form of powder, and the average particle size is about 5 to 500 μm (preferably 30 to 40 μm). When the average particle diameter deviates from the above range, the uniform dispersibility of the adsorbent is lowered, the adsorption efficiency is lowered, and when it is within the above range, the binder 1 and the fiber 1 as a filter medium described below are uniformly entangled and held. Adsorption efficiency is high.

  Examples of deoxidizers include magnesium oxide, calcium oxide (baked shellfish), magnesium carbonate, calcium carbonate, calcium silicate, magnesium silicate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, caustic soda, and soda ash. It is preferable to add and mix more than one type. Thereby, the filter 2 can be provided with a function of regenerating the oil oxidized by the deoxidizer. In addition, other additives may be appropriately added according to other purposes.

  Examples of the fiber 1 include various natural fibers 1 and chemical fibers 1 including pulp. The natural fiber 1 may be an animal fiber 1 such as wool or silk, a plant cellulose fiber 1 such as cotton, hemp or coconut fiber 1, or a mineral fiber 1 such as rock wool. Examples of the chemical fiber 1 include a recycled fiber 1 such as viscose artificial silk (for example, rayon), a semi-synthetic fiber 1 such as acetate artificial silk, a polyamide fiber 1 such as 6-nylon, a polyester fiber 1, an acrylic fiber 1 and a vinylon. And polyvinyl alcohol fiber 1 of the above. Furthermore, inorganic fibers 1 such as metal fibers 1 and carbon fibers 1 may be used, and these fibers 1 can be used alone or in combination of two or more.

  Examples of the pulp include wood pulp, linter pulp, straw pulp, mulberry, sanjo, and the like, and these pulps can be used alone or in combination of two or more. Furthermore, when the pulp and the chemical fiber 1 are combined, the strength of the filter 2 and the moldability can be improved. The blending ratio (weight ratio) is, for example, pulp: chemical fiber 1 = 100: 0 to 50:50 (preferably 100). : 0 to 70:30).

  The average diameter of the fiber 1 is about 0.1 to 20 μm (preferably 1 to 10 μm), and the average length is about 100 μm to 30 mm (preferably 500 μm to 10 mm).

  The filter 2 in which the adsorbent and the deoxidizer are entangled with the fiber 1 is formed into a sheet shape by a conventional manufacturing method such as compression molding, papermaking, or mold molding, and is not specifically described in detail. The blending ratio of the fiber 1, the adsorbent and the deoxidizer will be described later depending on the types of the fiber 1, the adsorbent and the deoxidizer, but when using pulp as the fiber 1 and activated carbon as the adsorbent, pulp: activated carbon and Deoxidizer = 9: 1 to 1: 2, preferably 4: 1 to 2: 1.

  Next, the shape of the fiber 1 will be described. In the present invention, the fiber 1 is formed in a bag shape that opens upward and has a smaller diameter as it goes downward. For example, as shown in FIG. 1 and FIG. 2, the shape of a container opening upward with a truncated cone is mentioned, but as shown in FIG. 3, the shape of a container opening upward with a rectangular pyramid inverted. Similarly, the shape of a container that opens upward by reversing any truncated pyramid such as a triangular frustum, a pentagonal frustum, and a hexagonal frustum, and a spherical surface that opens upward and becomes smaller in diameter The shape is not particularly limited. Then, when the fiber 1 is formed by compression molding or papermaking, the fiber 1 is loaded with an adsorbent and a deoxidizer, thereby forming the unit filter 2a having the above-described shape. Various methods can be used for forming the fiber 1, such as a method for obtaining a desired shape directly by molding, a method for obtaining a desired shape by forming a sheet once by papermaking, and then bending it.

  The thickness of the unit filter 2a is arbitrarily set to about 1 mm to 10 mm, and this thickness is only a fraction of the thickness of the conventional filter 2. Since the unit filter 2a has a shape that opens upward and becomes smaller in diameter as described above, the unit filters 2a having the same size and shape can be stacked one above the other. In use, a plurality of unit filters 2 a are used as the filter 2. In the example illustrated in FIG. 1, a unit in which three unit filters 2 a are stacked is used as the filter 2, but the number is not particularly limited.

  The filter 2 formed by stacking a plurality of unit filters 2a is installed in a container for oil filtration, or installed in a state where it is supported by a support means with an oil receiver disposed below, and above the filter 2 Inject used cooking oil o to be filtered from the opening. That is, since the filter 2 is molded from the fiber 1 and has self-holding property, it is not necessary to arrange the filter 2 along the container like a paper drip coffee filter, for example, and is along the outer surface of the filter 2. There is no need to provide a means for supporting, and it can be easily used for various things, and the flyer can also be used without a special means for supporting the filter 2. The oil o passes downward from the uppermost unit filter 2a in order, passes through the lowermost unit filter 2a, and then falls to the lower oil receiver. When the oil o passes through each unit filter 2a, impurities in the fiber 1 are filtered and removed, and at the same time, contaminants such as fine particles and odor that cannot be filtered by the fiber 1 are adsorbent. The oil o that has been adsorbed by the deoxidizer and oxidized by the deoxidizer is neutralized and regenerated.

  As described above, since the filter 2 is formed by stacking a plurality of unit filters 2a, the thickness of the unit filter 2a may be set to about 1 to 10 mm to be thinner than the conventional filter 2 of about 10 to 50 mm. Thus, the pressure loss in each unit filter 2a is reduced as compared with the conventional filter 2, and the time for passing through the filter 2 in which a plurality of unit filters 2a are stacked is shortened, and the filtration speed is improved.

  The filter 2 has a larger amount of adsorption on the upstream side to be filtered and a smaller amount of adsorption on the downstream side, and the amount of adsorption varies depending on the position of the unit filter 2a in a single use. In other words, the upstream (upper) unit filter 2a has a larger amount of adsorption, so in the conventional integral filter 2, the filter medium, adsorbent, and deoxidizer are present in the lower portion of the filter 2 in the thickness direction. Although it was wasted and wasted while leaving sufficient filtration capacity, adsorption capacity and deoxidation capacity (hereinafter referred to as purification capacity), in the present invention, a plurality of unit filters 2a are stacked to constitute the filter 2. Therefore, even if the unit filter 2a has a different level of dirt, the remaining filter capacity and purification capacity remain sufficiently by discarding only the dirty unit filter 2a (the uppermost unit filter 2a). The unit filter 2a can be used in the next filtration without being discarded. Therefore, as a preferred method of use, as shown in FIG. 2, oil o is filtered and purified with a filter 2 in which a predetermined number of unit filters 2a are stacked (FIG. 2 (a)), and then the unit filter 2a at the uppermost position is used. Is removed and discarded (FIG. 2 (b)), and a new unit filter 2a is stacked at the lowest position (FIG. 2 (c)), and the filter 2 having the same filtering ability and purification ability as before replacement is constructed. To do. By repeating this every time it is used, the filter 2 can always be provided with a certain filtration and purification capability. In this case, the unit filter 2a that is most dirty and has no or little filtration capability and purification capability is discarded. Therefore, it is possible to suppress the generation of waste by being discarded with sufficient filtering ability and purification ability.

  Moreover, by making the shape of the filter 2 (unit filter 2a) into a bag shape and making the whole into a filtration part and a purification part, a larger area than the conventional filter 2 can be made to function as a filtration part and a purification part. It is possible to increase the filtration rate by widening the passage area and lowering the passage amount per unit area. In addition, there is a high probability that parts that do not pass in one pass will be used after being used several times, and it is possible to further suppress discarding while leaving sufficient filtration capacity and purification capacity without passing. It has become.

  In addition, since the filter 2 (unit filter 2a) is formed in a bag shape, the oil o always passes through the filter 2, and the oil is removed from the gap between the oil filtration container and the filter 2 as in the past. It is possible to prevent o from leaking and not being filtered.

  In addition, although the edible example used as an object to filter and purify was demonstrated in this embodiment, as an object, it is not limited to edible oil, Other oils, such as machine oil, and other liquids are mentioned arbitrarily.

It is a perspective view of one embodiment of the filter of the present invention. (A)-(c) is explanatory drawing of replacement | exchange of the unit filter in a filter same as the above. It is a perspective view of other examples of a filter. It is a disassembled perspective view of the conventional oil filter.

Explanation of symbols

1 Fiber 2 Filter 2a Unit filter

Claims (1)

  A filter mainly composed of a powdery adsorbent and deoxidizer, a binder that binds and holds the adsorbent and deoxidizer, and a fiber as a filter medium, wherein the fiber opens upward. It is formed into a bag shape having a smaller diameter as it goes downward, and a unit filter is formed by supporting an adsorbent and a deoxidizer on the fiber, and a plurality of the unit filters are stacked one above the other. Filter.

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