JP2016040366A - Decolorant for refined oil and fat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decolorant for refined oil and fat capable of exhibiting excellent decoloration capacity to a physical purification treated refined oil and fat and providing a decolored oil with low acid value.SOLUTION: A decolorant consists of active white clay and silica-magnesia formulation, the total amount of a Mg component (MgO) and an Al component (AlO) is in a range of 10 to 45 pts.mass per 100 pts.mass of total amount of a Si component (SiO) derived from the active white clay and a Si component (SiO) derived from the silica-magnesia formulation and anionic adsorption performance represented by the orange II adsorption amount is in the range of 30 to 70 mmol/100 g.SELECTED DRAWING: None

Description

  The present invention relates to a decoloring agent for refined fats and oils that is applied to a decolorization treatment for fats and oils that have been physically refined.

  Oils and fats collected from animals and plants (hereinafter sometimes referred to as “crude oil”) are generally degumming treatment to remove phospholipids, deoxidation treatment to remove free fatty acids, water washing treatment to remove soap, pigment It passes through the decoloring process which removes odor, and finally passes through the deodorizing process which removes an odorous component, and is used for uses, such as cooking oil.

As the decolorizing agent used above, for example, an activated clay activated by increasing the specific surface area by acid treatment of dioctahedral smectite clay mineral (also called fuller's earth or bleaching earth) is known (patent). Reference 1).
Moreover, although it does not have the decoloring performance like activated clay, the silica magnesia formulation which the present applicant proposed also has the decoloring performance with respect to fats and oils (refer patent document 2).

  By the way, in refining the above fats and oils, the final deodorization treatment is performed by steam distillation under heating at 200 to 250 ° C., and it is desired to perform this deodorization treatment at a lower temperature and in a shorter time. . When deodorizing treatment is performed for a long time, not only the content of harmful substances such as trans fatty acids and 3MCPD (3-monochloropropanediol) increases, but the active ingredients in fats and oils such as tocophenol and sterol tend to decrease. Because there is. In order to perform the deodorizing process at a low temperature and in a short time, it is known that the acid value of the decolorized oil subjected to the decoloring process may be lowered.

On the other hand, recently, fats and oils purified by physical refining treatment (physical refining treatment) have been sold. The physical refining treatment is to deodorize (physical deacidification) treatment after the crude oil is degummed and decolorized. That is, alkali treatment is not performed, and free fatty acids are removed together with deodorization by deodorization by distillation. Since an alkali such as sodium hydroxide is not used, there is an advantage that purification treatment is performed at low cost. In particular, many imported products have been subjected to such physical refining treatment. For example, palm oil that has undergone such treatment is called RBD (Refined Bleached Deodorized) palm oil (see, for example, Patent Document 3). ).
By the way, fats and oils that have been physically refined as described above (that is, refined fats and oils) are inexpensive, but have not been sufficiently refined. Mostly done.
However, as described above, there is a problem that it is difficult to perform decolorization when the refining process is performed again on the oil and fat that has been once purified. Probably, it is thought that the pigments contained in the fats and oils are polymerized during the distillation performed in the physical refining process to increase the molecular weight.

For example, when performing decoloring treatment using activated clay, it is necessary to use activated clay with higher activity or use a large amount of activated clay in order to effectively perform decolorization. The acid value of the decolorized oil produced becomes high.
Further, when a silica magnesia preparation is used, an increase in acid value can be suppressed, but a decoloring ability as high as that of activated clay cannot be obtained.

JP 2008-31411 A JP 2005-6510 A JP2011-30482A

Accordingly, an object of the present invention is to provide a decolorizing agent for refined fats and oils that exhibits excellent decolorizing ability with respect to refined fats and oils that have undergone a physical refining treatment and that can obtain a decolorized oil having a low acid value. .
Another object of the present invention is to provide a bleaching agent for refined fats and oils that has excellent decolorizing ability and low acid value ability, particularly for RBD palm oil.

  As a result of conducting many experiments on the decolorization property to refined fats and oils, the inventors maintained an excellent decolorizing ability of the activated clay when the activated clay and the silica magnesia preparation were mixed at a certain ratio. As such, the present inventors have found that a decolorized oil having a low acid value can be obtained and completed the present invention.

According to the present invention, consists of a mixture of activated clay and silica magnesia formulation, in terms of oxide, the total amount of the Si component derived from activated clay (SiO ₂₎ and silica magnesia preparation derived Si component (SiO ₂₎ 100 The total amount of Mg component (MgO) and Al component (Al ₂ O ₃ ) is in the range of 10 to 45 parts by mass per part by mass, and the anion adsorption capacity represented by Orange II adsorption amount is 30 to 70 mmol / Provided is a bleaching agent for refined fats and oils, characterized by being in the range of 100 g.

In the bleaching agent for refined fats and oils of the present invention, the mass ratio (Al ₂ O ₃ / MgO) of Mg component (MgO) to Al component (Al ₂ O ₃ ) is 0.10 to 4.00 in terms of oxide. It is desirable to be in the range.

  According to the decoloring agent of the present invention, when decolorization of fats and oils that have been subjected to physical refining treatment, it is possible to effectively decolorize while reducing the acid value compared to treatment using only activated clay. .

The color tone of fats and oils is evaluated by a color tone index (Y + 10R) calculated from a Y value (index indicating yellowness) and an R value (index indicating redness) measured using a Robibond colorimeter. The smaller the is, the closer it is to colorless, indicating that decolorization is effectively performed.
For example, as shown in the experimental examples of Examples described later, when RBD palm oil (color tone index 68, acid value 0.19) subjected to physical refining treatment is subjected to decolorization treatment using activated clay. The obtained decolorized oil has a color tone index of 28 and is effectively decolored, but the acid value (KOHmg / g) is 0.27 and the acid value increases rather than decreases. (Comparative Example 1). That is, in the activated clay, in addition to the removal of free fatty acids, the activated clay itself has a solid acid, and as a result, it is considered that the acid value has increased. On the other hand, when the decolorization treatment is performed using the silica magnesia preparation, the acid value is as low as 0.07, and adsorption and removal of free fatty acids are effectively performed, but the color index is 34. Yes, the degree of decolorization is low compared to activated clay (Comparative Example 2).
However, according to the present invention, when the bleaching treatment is performed using the bleaching agent of the present invention in which activated clay and silica magnesia preparation are mixed at a certain ratio, the color index is 28, and the activated clay is used alone. Decolorization treatment is performed in the same manner as when used, and the acid value of the obtained decolorized oil is reduced to 0.25 or less (Examples 1 to 4).

  As understood from this, in the present invention, it is possible to greatly reduce the acid value while maintaining the excellent decolorizing ability of the activated clay. That is, activated clay is highly adsorbable to pigments such as chlorophyll, while silica magnesia formulation is not as active as activated clay, but at the same time exhibits adsorbability to a certain level and to free fatty acids. Adsorbability is shown. It is considered that the magnesia component in the silica magnesia preparation exhibits adsorptivity to free fatty acids. As a result, by replacing part of the activated clay with a silica magnesia formulation, not only the increase in the acid value derived from the activated clay can be suppressed, but also the adsorptivity to free fatty acids can be increased and the acid value can be greatly reduced. In addition, the decrease in the adsorptivity to the pigment due to the replacement of the activated clay is compensated by the silica magnesia preparation, and it is possible to maintain excellent decolorization performance.

As described above, according to the present invention, it is possible to effectively perform decolorization and reduction of the acid value of fats and oils that have been subjected to physical refining treatment, and in particular, the acid value can be reduced. It is expected that the treatment can be performed at a lower temperature and in a shorter time, and an increase in harmful substances and a decrease in active ingredients can be avoided.
Such a decolorizing agent for refined fats and oils of the present invention is particularly effectively applied to decoloring inexpensive RBD palm oil that is often used as an edible oil.

DETAILED DESCRIPTION OF THE INVENTION

  The bleaching agent for refined fats and oils of the present invention is a mixture of activated clay and silica magnesia preparation.

1. Activated clay The activated clay used in the present invention is known per se, and uses dioctahedral smectite clay mineral, pulverized and classified to prepare powder of a predetermined particle size, and this powder is acid-treated under predetermined conditions. It is manufactured by.

Dioctahedral smectite clay minerals used as raw clay is believed to volcanic rock and lava is modified under the influence of sea water, consists SiO ₄ tetrahedral layers -AlO ₆ octahedral layer -SiO ₄ tetrahedra layer, In addition, a three-layer structure in which the tetrahedral layer and the octahedral layer are partially replaced by the same type of metal is used as a basic structure (unit layer), and Ca, K, There are cations such as Na and hydrogen ions and water molecules coordinated with them. In addition, a part of Al in the octahedral layer of the basic trilayer structure is replaced with Mg or Fe ^(II) , and a part of Si in the tetrahedral layer is replaced with Al, so the crystal lattice is negative. The negative charge is neutralized by metal cations and hydrogen ions existing between the basic layers. Such smectite clay includes acid clay, bentonite, fuller's earth, and the like, and shows different characteristics depending on the kind and amount of metal cations existing between metal layers, the amount of hydrogen ions, and the like. For example, bentonite has a large amount of Na ions present between the basic layers, and therefore, the pH of the dispersion suspended in water is high, generally on the high alkali side, and has high swellability with respect to water. Furthermore, it shows the property of gelling and solidifying. On the other hand, in the acid clay, the amount of hydrogen ions present between the basic layers is large, and therefore, the pH of the dispersion suspended and dispersed in water is low, generally on the acidic side, and swellable with water. However, compared with bentonite, its swelling property is generally low, and it does not cause gelation.

The dioctahedral smectite clay used for the production of the activated clay is not particularly limited, and any of the various types described above can be used. In addition, such a raw clay generally has the following composition in terms of oxides, although it varies depending on the origin of the clay, the production area, and the same production area depending on the buried place (face).
SiO _2; 50 to 75 wt%
Al ₂ O _3; 14~25 wt%
Fe ₂ O ₃ ; 2 to 20% by mass
MgO; 3-7 mass%
CaO; 0.1-3 mass%
Na ₂ O; 0.1 to 3 wt%
K ₂ O; 0.1 to 3 wt%
Other oxides (such as TiO _2); 1 wt% or less Ig-loss (1050 ℃); 5~10 wt%

Prior to acid treatment of the above-mentioned dioctahedral smectite clay mineral, after subjecting it to refining operations such as stone sand separation, buoyancy beneficiation, magnetic beneficiation, elutriation, wind dredging, etc., the particle size is adjusted. It is preferable to adjust the particle size so that the average particle size (D ₅₀ ) in terms of volume is 20 to 30 μm to obtain a powder.
The acid treatment may be performed by a method known per se using an aqueous mineral acid solution such as sulfuric acid. By subjecting such fine powder to acid treatment, a part of the Al component in the smectite is removed, resulting in an increase in specific surface area and an increase in pore volume, which is suitable for adsorption of pigments such as chlorophyll. An activated clay with excellent physical properties and excellent decolorization performance can be obtained.

  After the acid treatment, the obtained activated clay is allowed to stand in a state of being suspended and dispersed in water, if necessary, and then subjected to water pouring, so that fine particles of 5 μm or less become about 15% by volume by sedimentation separation. In addition, the target activated clay can be obtained by drying.

Like the raw clay powder, the activated clay powder thus obtained has an average particle size (D ₅₀ ) in terms of volume in the range of 20 to 30 μm, and the content of fine particles of 5 μm or less in the range of 15% by volume or less. Furthermore, the concentration of the surface silanol group is reduced, the hygroscopicity, the swellability, etc. are reduced. Furthermore, the filterability is excellent due to the removal of fine particles, which is suitable for decolorization treatment.

The activated clay obtained by the acid treatment described above generally has the following chemical composition in terms of oxide.
SiO _2; 60 to 85 wt%
Al ₂ O _3; 6~13 wt%
Fe ₂ O _3; 1~10 wt%
MgO; 1-4% by mass
CaO; 0.1 to 2% by mass
Na ₂ O; 0.1 to 1 wt%
K ₂ O; 0.1 to 1 wt%
Other oxides (such as TiO _2); 1 wt% or less Ig-loss (1050 ℃); 4~8 wt%

Further, such activated clay has a pore volume (by nitrogen adsorption method) at a pore diameter of 1.7 to 100 nm in a range of 0.25 to 0.50 cm ³ / g and a bulk density of 0.50 to 0.50. In the range of 0.70 g / cm ³ , the BET specific surface area is generally in the range of 150 to 350 m ² / g, and such physical properties exhibit excellent decolorization properties for fats and oils. That is, pigments such as chlorophyll are present in a state in which molecules are associated in fats and oils. Therefore, they are adsorbed and held in relatively large pores on the surface of the particles formed by acid treatment. Since the activated clay has such large pores formed, it exhibits excellent decolorization properties as shown in Examples described later.

2. Silica magnesia formulation;
In the present invention, the silica magnesia preparation to be mixed with the activated clay described above has a form in which the silica particles and the magnesia particles are mixed and combined and integrated without any chemical bond such as exchange of atoms or recombination. It is. That is, they are integrated so as not to be separated by physical means.

Such a silica magnesia preparation has a mass ratio (SiO ₂ / MgO) of silica (SiO ₂ ) to magnesia (MgO) in the range of 1.3 to 3.0, for example, Japanese Patent Application Laid-Open No. 2005-8676. It is produced by a known method described in the above.
That is, an amorphous silica aqueous slurry obtained by a gel method or a sedimentation method and an aqueous slurry of magnesia or its hydrate are used in such amounts that the amount ratio of silica and magnesia falls within the above range. The aqueous slurry is homogeneously mixed and aged at a temperature of 100 ° C. or less, particularly 50 to 97 ° C. for 0.5 hours or more, particularly 1 to 24 hours, and after cooling, wet pulverization is performed by a ball mill or a colloid mill. By obtaining particles of 5 μm or less and finally removing moisture by drying, a silica magnesia preparation in which silica particles and magnesia particles are intimately combined can be obtained.

Such a silica magnesia preparation is appropriately dry pulverized and classified, for example, the content of fine particles having a particle size smaller than 5 μm is 20% by volume or less, and is based on a volume basis measured by a laser diffraction scattering method. The average particle diameter D50 is used as a particle having a size of about 20 to ₂₀₀ μm.

Such a silica magnesia preparation generally has a pH of 7 to 10 in a 5% suspension, exhibits basicity, a bulk density of 0.2 to 0.4 g / cm ³ , and a BET specific surface area of 500 to 800 m ^2. / G, the pore volume is 1.7 to 300 nm, and the pore volume is in the range of 0.5 to 1.5 cm ³ / g. That is, it is considered that the silica magnesia preparation exhibits high adsorptivity with respect to a high molecular weight component produced by distillation or the like.
Such a silica magnesia preparation is commercially available, for example, from Mizusawa Chemical Co., Ltd. under the trade name Mizuka Life.

3. Decoloring agent for refined fats and oils;
In the present invention, the above-described activated clay and silica magnesia preparation are dry-mixed and used as a decolorizer for refined fats and oils.
That is, the activated clay alone exhibits a high decoloring property with respect to the refined fats and oils, so the amount of the activated clay increases, and the use of a large amount of the activated clay increases the acid value of the resulting decolorized oil. However, in the present invention, by using the silica magnesia preparation together, not only the acid value of the decolorized oil can be reduced, but also the excellent decolorization property of the activated clay can be maintained. For example, although a part of the activated clay is replaced with a silica magnesia preparation, it is possible to develop a decoloring performance equivalent to that of the activated clay without such replacement.

  That is, in the silica magnesia preparation used in the present invention, since the magnesia component exhibits adsorptivity to acids such as free fatty acids, the acid value of the decolorized oil can be reduced, and at the same time, the physical properties such as pore distribution are probably This is an effective range for adsorption of high molecular weight impurities peculiar to refined fats and oils, and it is considered that the decolorization performance equivalent to that of activated clay can be secured.

In the decolorizing agent of the present invention, in terms of oxide, Mg component (MgO) per 100 parts by mass of the total amount of Si component derived from activated clay (SiO ₂ ) and Si component derived from silica magnesia preparation (SiO ₂ ) The total amount of the Al component (Al ₂ O ₃ ) is in the range of 10 to 45 parts by mass, particularly 20 to 35 parts by mass, and the anion adsorption capacity expressed by Orange II adsorption amount is 30 to 70 mmol / 100 g, particularly It is essential to be in the range of 35-50 mmol / 100 g, and the activated clay and the silica magnesia preparation must be mixed so as to satisfy such conditions.

That is, the activated clay is obtained by acid treatment of dioctahedral smectite clay mineral, and as described above, it contains a silica component (SiO ₂ ) and a magnesium component as in the silica magnesia preparation. ing. Since the acid value reducing function (that is, the free fatty acid adsorption function) of the silica magnesia preparation is based on the magnesia (MgO) component, this decoloring agent is used in order to exert the above-described decoloring performance and acid value reducing function. It is necessary that an appropriate amount of magnesia component is present, but since the silica component and magnesium component are present as common components, the amount of magnesia component in the decoloring agent cannot be simply specified. . However, although the silica magnesia preparation is derived from the magnesia component and exhibits an adsorptivity to the anionic dye (Orange II), the activated clay shows little adsorptivity to the anionic dye. This is because the Mg component in the activated clay is incorporated in the crystal (in the Al octahedral layer) and therefore does not exhibit adsorptivity to the anionic dye. Therefore, from the ratio of the total amount of Mg component and Al component (Al component is not included in the silica magnesia preparation) to the total amount of silica component and the anion adsorption ability by Orange II, activated clay and silica magnesia It defines the appropriate mixing ratio with the drug product.
For example, when the total amount of Mg component and Al component is larger than the above range or when the anion adsorption capacity is larger than the above range, the amount of silica magnesia preparation is excessive, and as a result, the acid value reducing function is Even if it can be satisfied, the decolorization performance with respect to the refined fats and oils is lowered. Further, when the total amount of the Mg component and the Al component is less than the above range or when the anion adsorption capacity is less than the above range, the amount of the activated clay is excessive, and the acid value reducing function is impaired. .

In the decolorizing agent of the present invention, the mass ratio (Al ₂ O ₃ / MgO) of Mg component (MgO) to Al component (Al ₂ O ₃ ) is 0.10 to 4.00 in terms of oxide. In particular, it is preferable to be in the range of 0.10 to 3.00. That is, since the amount of the Mg component contained in the activated clay varies considerably depending on the production area of the smectite clay mineral subjected to the acid treatment, the mass ratio (Al ₂ O ₃ / MgO) is set in the above range. By this, the outstanding decoloring ability and an acid value reduction function can be expressed more reliably.

Such a decoloring agent for refined fats and oils according to the present invention has an acid value reducing function as well as excellent decolorizing properties for fats and oils subjected to physical refining. Therefore, degumming treatment (water degumming by adding water and acid degumming by adding acid such as phosphoric acid) to remove phospholipids according to conventional methods for such refined fats and oils, addition of alkali such as sodium hydroxide After performing deoxidation treatment, centrifugation, water washing treatment for removing soap, and dehydration treatment by centrifugation, etc., decolorization treatment using the decoloring agent of the present invention is performed, and filtration is performed, for example, A decolorized oil having a value (KOHmg / g) of 0.25 or less and a color tone index (Y + 10R) of 28 or less can be obtained (Examples 1 to 4).
That is, since this decolorized oil has a low acid value and a small amount of free fatty acid, the deodorizing treatment by steam distillation performed next can be performed at a lower temperature and in a shorter time. For example, in the past, the steam was distilled for about 40 to 90 minutes under heating at 200 to 250 ° C., but this steam distillation was performed at a lower temperature and in a shorter time to remove malodorous components. It is expected that it can be removed. As a result, it is possible to effectively suppress an increase in harmful substances such as trans fatty acids and 3-MCPD and a decrease in active ingredients such as tocophenol and sterol resulting from the deodorization treatment.

  Therefore, the decoloring agent of the present invention is extremely effective for decolorizing refined fats and oils applied to edible oils such as RBD palm oil that is imported in large quantities from overseas and used in many applications such as margarine. is there.

  The invention is illustrated by the following experimental example. In addition, the measuring method in an Example is as follows.

(1) Chemical composition Samples were decomposed by alkali melting, SiO ₂ was measured by gravimetric method, Al ₂ O ₃ was measured by EDTA-zinc back titration method, and MgO was measured by chelate titration, and each metal component was quantified. In addition, a sample is based on the thing dried at 110 degreeC for 3 hours.

(2) Orange II adsorption amount The orange II adsorption capacity in this example was measured and calculated by the following method using the number of mmols of orange II that can be adsorbed by a 1 g sample from an orange II aqueous solution having a concentration of 10 mmol / L.
First, Orange II (special grade reagent, manufactured by Wako Pure Chemical Industries, Ltd.) is dissolved in water to obtain an Orange II aqueous solution having a concentration of 10 mmol / L.
20 ml of this 10 mmol / L orange II aqueous solution was weighed into a 50 ml centrifuge tube, added with 0.20 g of test powder, and shaken (SA300 manufactured by Yamato Scientific Co., Ltd., shake speed 5) to 7.5. Shake time. Allow to stand for at least 12 hours after shaking.
Next, 0.5 mL of the supernatant of the liquid treated for 15 minutes at a centrifugal acceleration of 3000 rpm was collected with a centrifuge (5200 manufactured by Kubota Co., Ltd.), and the absorbance of 484 nm wavelength light of the liquid diluted 200 times with ion-exchanged water. Was measured with a spectrophotometer (V-630 manufactured by JASCO Corporation). And the orange II residual amount of the sample liquid was computed using the analytical curve which shows the relationship of the orange II content of orange II aqueous solution, and the light absorbency of 484 nm wavelength light. The value obtained by subtracting this value from the amount of Orange II added to the sample is taken as Orange II adsorption amount.

(3) Decoloring test method The performance of the decoloring agent in this example is the color tone and acid of the decoloring oil obtained by treating RBD palm oil (color tone index 68, acid value 0.19) with the decoloring agent under reduced pressure. It was evaluated by the measured value.
First, 200 g of RBD palm oil is collected in a 300 mL round bottom flask, and 4 g (2.0% by mass with respect to the oil) of each decolorizer sample is added and mixed well with a stirrer. The flask was heated to 110 ° C. using a heater while reducing the pressure to 40 mmHg, and stirred for 20 minutes with a vacuum stirrer. Next, after cooling to room temperature, it was brought to atmospheric pressure, and each decolorized oil was obtained by filtering the mixed suspension of oil and decolorizer.
The color tone of each decolorized oil is a color tone calculated from a Y value (index indicating yellowness) and an R value (index indicating redness) measured using a Robibond colorimeter (Model F manufactured by Tintometa). Evaluation is based on an index (Y + 10R), and the smaller this value is, the closer it is to colorless and the more effective decolorization is performed.
The acid value of each decolorized oil was measured according to the standard oil analysis method 2.3.1-1996 established by the Japan Oil Chemists' Society. The lower this value, the less the free fatty acid content, indicating that free fatty acids are effectively removed.

(Comparative Example 1)
Using smectite clay produced in the womb of Niigata Prefecture as a raw material, this raw material was roughly crushed, kneaded and granulated to a diameter of 5 mm. The water content of the obtained granulated product was 37%.
1500 g of this granulated product was filled into a treatment tank, and 2000 ml of 35% by mass sulfuric acid aqueous solution was circulated therein for acid treatment. The treatment temperature at that time was 90 ° C., and the treatment time was 7 hours. After completion of the acid treatment, washing water was circulated through the acid-treated product, followed by washing with water, followed by drying, pulverization and classification at 110 ° C. to obtain an activated clay powder.
The obtained activated clay powder was measured for various physical properties, and the results are shown in Table 2.

(Comparative Example 2)
Various properties of the silica magnesia preparation (manufactured by Mizusawa Chemical Co., Ltd.) were measured, and the results are shown in Table 2.

Example 1
And activated clay obtained in Comparative Example 1, the silica magnesia preparation of Comparative Example 2, the total amount of 100 parts by mass of the Si component derived from activated clay (SiO ₂₎ and silica magnesia preparation derived Si component (SiO ₂₎ Various physical properties were measured on the powder obtained by dry mixing so that the total amount of Mg component (MgO) and Al component (Al ₂ O ₃ ) was 17, and the results are shown in Table 1.

(Example 2)
Si components derived from activated clay in Example 1 (SiO ₂₎ and silica magnesia preparation derived from Si component of total amount per 100 parts by weight of the (SiO _2), Mg component (MgO) and Al component _{(Al 2 O} 3) Various physical properties of the powder obtained by substituting 25 for the total amount were measured, and the results are shown in Table 1.

(Example 3)
Si components derived from activated clay in Example 1 (SiO ₂₎ and silica magnesia preparation derived from Si component of total amount per 100 parts by weight of the (SiO _2), Mg component (MgO) and Al component _{(Al 2 O} 3) Various physical properties of the powder obtained by substituting 32 for the total amount were measured, and the results are shown in Table 1.

Example 4
Si components derived from activated clay in Example 1 (SiO ₂₎ and silica magnesia preparation derived from Si component of total amount per 100 parts by weight of the (SiO _2), Mg component (MgO) and Al component _{(Al 2 O} 3) Various physical properties of the powder obtained by substituting 41 for the total amount were measured, and the results are shown in Table 1.

(Comparative Example 3)
And activated clay powder obtained in Comparative Example 1, the magnesium oxide (Konoshima Chemical Co., Ltd. Sutamagu U), and Si components derived from activated clay (SiO ₂₎ and silica magnesia preparation derived Si component (SiO ₂₎ Measure various physical properties of the powder obtained by dry mixing so that the total amount of Mg component (MgO) and Al component (Al ₂ O ₃ ) per 100 parts by mass of the total amount of It is shown in Table 2.

(Comparative Example 4)
Using commercially available silicon dioxide (Mizusawa Chemical Co., Ltd. Mizuka Sorb C-1) and commercially available calcium hydroxide (Wako Pure Chemical Industries, Ltd. calcium hydroxide), silica (SiO ₂ ) and calcium (CaO) The raw material is weighed so that the mass ratio of (SiO ₂ / CaO) is 9 and the total of the silica component content in terms of SiO ₂ and the calcium component content in terms of CaO is 150 g. Next, tap water is added to a 2 L stainless steel tank so that the total of the powder raw material added later becomes 1150 g, and the powder raw material weighed in advance is added little by little while stirring. Stirring is continued, and the temperature is raised to 95 ° C. in about 15 minutes by heating, followed by homogeneous mixing and aging over 10 hours. The slurry is dehydrated by vacuum filtration, and the resulting cake is put into an electric dryer and dried at 110 ° C. Finally, the dried cake was pulverized with a sample mill (hammer mill type pulverizer) to obtain calcium silicate powder.
Various physical properties of the powder obtained by dry-mixing the calcium silicate powder and the activated clay obtained in Comparative Example 1 so that the weight ratio of active clay: calcium silicate is 2: 1 were measured. The results are shown in Table 2.

Claims (3)

It consists of a mixture of activated clay and silica magnesia preparation, and in terms of oxide, Mg component per 100 parts by mass of the total amount of Si component derived from activated clay (SiO ₂ ) and Si component derived from silica magnesia preparation (SiO ₂ ) The total amount of (MgO) and the Al component (Al ₂ O ₃ ) is in the range of 10 to 45 parts by mass, and the anion adsorption capacity represented by the orange II adsorption amount is in the range of 30 to 70 mmol / 100 g. A decolorizing agent for refined fats and oils characterized by The purification according to claim 1, wherein the mass ratio (Al ₂ O ₃ / MgO) of Mg component (MgO) and Al component (Al ₂ O ₃ ) is in the range of 0.10 to 4.00 in terms of oxide. Degreasing agent for oils and fats.   The decoloring agent for refined fats and oils according to claim 1 or 2, which is used for decolorizing refined palm oil.