JP2007143525A - Deteriorated edible oil regenerating agent, and deteriorated edible oil regenerating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a deteriorated edible oil regenerating agent capable of not only lowering the acid value of the deteriorated oil but also absorbing a pigment composition (decoloring), with a small amount added to deteriorated edible oil. <P>SOLUTION: This deteriorated edible oil regenerating agent is obtained by dry mixing with calcium hydroxide and silicon dioxide as a food additive, which has a total specific surface area of ≥350m<SP>2</SP>/g, whose pore form has a distribution maximum in a range of a pore diameter of 4-50 nm and whose external surface area calculated by V<SB>1</SB>-t method occupies ≥80% of the total specific surface area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an edible oil regenerating agent for regenerating deteriorated edible oil after frying beans, side dishes, etc., and a method for regenerating deteriorated edible oil.

  In recent years, a large amount of edible oil has been used in food sales that sells fried foods such as convenience stores and side dishes. When frying seeds such as sugar beet with such edible oil, the edible oil is exposed to high temperatures and used repeatedly. For this reason, edible oil undergoes degradation due to hydrolysis, oxidation, and the like. As a result, 1) an increase in acid value due to the formation of free fatty acids, 2) an increase in iron content, a yellowish brown to brown coloration, and an increase in chromaticity are caused. In particular, the coloring of the edible oil of 2) tends to appear relatively early and gives a bad impression to the user, and the coloring may shift to fried foods such as tempura, which may impair the appearance and reduce appetite.

  From the request of effective use of resources and recycling of foods, magnesium oxide or calcium hydroxide has been conventionally used to reduce the acid value in degraded edible oil of 1) above, and the adsorption of colored components of 2) above ( Acid bleaching and activated clay are used for decolorization.

On the other hand, Patent Documents 1 and 2 disclose a method for producing an edible oil purifier comprising a mixture of calcium hydroxide and acid clay capable of exhibiting both functions of reducing the acid value and decoloring of deteriorated oil. ing.
JP-A-61-103997 JP-A-61-103998

  However, although the acid value reduction by calcium hydroxide can be sufficiently manifested in the edible oil purifiers of Patent Documents 1 and 2, decolorization by acid clay is a large amount of 30 parts by weight with respect to 100 parts by volume of the degraded oil. It is necessary to add. For this reason, it takes time to filter the cleaning agent after treatment of the deteriorated oil, that is, not only the total processing time of the deteriorated oil is increased, but also the amount of edible oil decreases as the edible oil is adsorbed by the cleaning agent. It was.

  An object of the present invention is to provide a regenerated agent for deteriorated edible oil that can adsorb (decolor) a pigment component as well as reduce the acid value of the deteriorated oil with a small addition amount to the deteriorated edible oil. .

  It is an object of the present invention to provide a method for regenerating a deteriorated edible oil that can adsorb (decolor) a pigment component as well as reducing the acid value of the deteriorated oil with a small addition amount to the deteriorated edible oil. To do.

According to the present invention, the total specific surface area is 350 m ² / g or more, the pore morphology has a distribution maximum in the range of 4 to 50 nm pore diameter, and the external surface area calculated by the V _l -t method is the total specific surface area. There is provided a regenerated agent for deteriorated edible oil obtained by dry-mixing food additive silicon dioxide occupying 80% or more of the above and food additive calcium hydroxide.

According to the present invention, the total specific surface area is 350 m ² / g or more, the pore morphology has a distribution maximum in the range of pore diameters of 4 to 50 nm, and the external surface area calculated by the V _l -t method is A edible oil regenerated agent obtained by dry-mixing food additive silicon dioxide occupying 80% or more of the surface area and food additive calcium hydroxide is brought into contact with deteriorated edible oil heated to 200 ° C. or lower. A method for regenerating degraded edible oil is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the reproduction | regeneration agent for degraded edible oils which can adsorb | suck (decolor) not only the acid value of degraded oil but the pigment | dye component can be provided.

  According to the present invention, it is possible to provide a method for regenerating a deteriorated edible oil that can adsorb (decolor) a pigment component as well as reduce the acid value of the deteriorated oil with a small blending amount with respect to the deteriorated edible oil. .

  Hereinafter, the regenerated agent for deteriorated edible oil and the method for regenerating deteriorated edible oil according to the present invention will be described in detail.

The regenerated agent for deteriorated edible oil according to this embodiment has a total specific surface area of 350 m ² / g or more, a pore shape having a distribution maximum in a range of pore diameters of 4 to 50 nm, that is, mesopores, and V _l Food additive silicon dioxide in which the external surface area calculated by the -t method occupies 80% or more of the total specific surface area and the food additive calcium hydroxide are dry-mixed.

The V _l -t method (t-plot method) is a known technique, and is described in detail, for example, in the literature [Seiichi Kondo et al., Chemical Seminar 16 “Science of adsorption” Maruzen Co., Ltd., pages 52-54, pages 79-80]. It is described in. From this document, the t-plot method uses a standard isotherm in which the average thickness (t) of the adsorbed film is plotted against the relative pressure (P / P0). Here, (t) is represented by the product of the average total number of adsorption (V / Vm) in the adsorption film and the thickness (σ) of the monomolecular layer. When the adsorbate is a nitrogen molecule, σ = 0.354 nm, V is a nitrogen adsorption amount, and Vm is a nitrogen monolayer adsorption amount. Plots adsorption amount (V _l) with respect to (t) is a t- plot.

  For example, when the sample has micropores, the t-plot is not a single straight line passing through the coordinate origin, but a straight line shifted downward at a point where t is large is obtained. The external surface area is determined from the slope of the straight line at the location where t is large. When the sample has mesopores without micropores, the t-plot is shifted upward from a straight line passing through the coordinate origin at a location where t is large, and the total surface area is obtained as the external surface area.

When the total specific surface area of the food additive silicon dioxide is less than 350 m ² / g, for example, when applied to the regeneration of deteriorated edible oil heated to 200 ° C. or less, it may be difficult to effectively decolorize. The upper limit of the total specific surface area of the food additive silicon dioxide is preferably 1500 m ² / g, more preferably 700 m ² / g.

When the ratio of the external surface area calculated by the V ₁ -t method to the total specific surface area is less than 80%, for example, when applied to the regeneration of deteriorated edible oil heated to 200 ° C. or less, it is difficult to effectively remove the color. There is a risk of becoming. The ratio of the external surface area calculated by the more preferable V ₁ -t method to the total specific surface area is 90% or more, and most preferably 100%.

  The food additive silicon dioxide may have any shape and particle size, but preferably has a spherical shape and a diameter of 10 to 300 μm in consideration of ease of handling.

  The food additive silicon dioxide can be produced, for example, by the following three methods.

(1) Method for producing food additive silicon dioxide by magnesium elution method First, water is placed in a reaction vessel and heated. This heating is preferably 40 to 100 ° C. Subsequently, a sodium silicate solution and a magnesium sulfate solution are dropped while stirring the warm water in the reaction vessel. The sodium silicate solution and the magnesium sulfate solution have a molar ratio in terms of SiO ₂ and MgO of 4: 1 to 1: 1, and the total weight is 1 to 1 with respect to the weight of water and sodium silicate and magnesium sulfate. It is preferable to drop it so that it may become 40 weight%.

Next, sulfuric acid is added to the solution in the reaction vessel to elute magnesium to prepare a slurry. At this time, the sulfuric acid to be added may be dilute sulfuric acid or concentrated sulfuric acid. For example, 10 to 70% by weight of concentrated sulfuric acid is preferable. The sulfuric acid is preferably added at a 1.0 to 2.0 molar ratio with respect to magnesium sulfate. The obtained slurry is filtered, washed with water, and dried, and the dried product is crushed as necessary, so that the total specific surface area is 350 m ² / g or more and the pore shape is in the range of pore diameters of 4 to 50 nm. And a food additive silicon dioxide in which the external surface area calculated by the V _l -t method occupies 80% or more of the total specific surface area. At this time, washing with water is preferably performed until no sulfuric acid residue is observed.

(2) Method for producing food additive silicon dioxide by urea burning method First, water, sodium silicate solution and urea are placed in a reaction vessel. At this time, the sodium silicate solution (SiO ₂ equivalent) and urea in their molar ratio of 20: 1 to 1: is preferably blended to be 1. The total amount of sodium silicate and urea is preferably blended so as to be 1 to 40% by weight based on the weight of water, sodium silicate and urea.

Next, after heating the solution in the reaction vessel, an acid is added to coprecipitate urea composite silicon dioxide. The heating temperature of the solution is preferably 5 to 100 ° C. In dropping the acid, the solution is preferably stirred. Examples of the acid include dilute hydrochloric acid and dilute sulfuric acid. Subsequently, the coprecipitate in the reaction vessel is filtered, washed with water, and dried to obtain urea composite silicon dioxide. Subsequently, by burning the obtained urea composite silicon dioxide to burn away urea, the total specific surface area is 350 m ² / g or more, and the pore shape has a distribution maximum in the range of the pore diameter of 4 to 50 nm, And the food additive silicon dioxide in which the external surface area calculated by the V _l -t method occupies 80% or more of the total specific surface area is produced. At this time, the firing is desirably performed at 200 to 1000 ° C., more preferably 300 to 700 ° C. in an oxidizing atmosphere such as air.

(3) Method for Producing Food Additive Silicon Dioxide by Template Method First, water, sodium silicate solution and polyoxyalkylene alkyl ether are placed in a reaction vessel. At this time, the sodium silicate solution (in terms of SiO ₂ ) and the polyoxyalkylene alkyl ether are preferably blended so that the weight ratio thereof is 4: 1 to 1: 2. The total amount of sodium silicate and polyoxyalkylene alkyl ether is preferably 1 to 40% by weight based on the weight of water, sodium silicate and polyoxyalkylene alkyl ether. As said polyoxyalkylene alkyl ether, polyoxyethylene polyoxypropylene glycol etc. can be used, for example.

Next, after heating the solution in the reaction vessel, an acid is added to coprecipitate polyoxyalkylene alkyl ether composite silicon dioxide. The heating temperature of the solution is preferably 50 to 100 ° C. In dropping the acid, the solution is preferably stirred. Examples of the acid include dilute hydrochloric acid and dilute sulfuric acid. Subsequently, the coprecipitate in the reaction vessel is filtered, washed with water, and dried to obtain polyoxyalkylene alkyl ether composite silicon dioxide. Subsequently, the obtained polyoxyalkylene alkyl ether composite silicon dioxide is fired to burn off the polyoxyalkylene alkyl ether, so that the total specific surface area is 350 m ² / g or more and the pore morphology is in the range of pore diameter of 4 to 50 nm. Food additive silicon dioxide having a maximum distribution and an external surface area calculated by the V _l -t method occupying 80% or more of the total specific surface area. At this time, the firing is desirably performed at 200 to 1000 ° C., more preferably 300 to 700 ° C. in an oxidizing atmosphere such as air.

  The food additive calcium hydroxide may have any shape and particle size, but preferably has a spherical shape and a diameter of 10 to 300 μm in consideration of ease of handling.

  The blending ratio of the food additive silicon dioxide and the food additive calcium hydroxide is appropriately selected according to the purpose of regenerating the deteriorated edible oil heated to, for example, 200 ° C. or less. For example, it is preferable to increase the blending ratio of the food additive silicon dioxide that contributes to the decolorization of the deteriorated edible oil in the regeneration that emphasizes the decolorization of the deteriorated edible oil. On the other hand, in the regeneration that emphasizes the reduction of the acid value of the deteriorated edible oil, it is preferable to increase the blending ratio of the food additive calcium hydroxide that contributes to the reduction of the acid value of the deteriorated edible oil. In particular, when the blending weight of the food additive silicon dioxide is M1, and the blending weight of the food additive calcium hydroxide is M2, M1 / It is preferable to set M2 to 2.3 to 20, more preferably 8 to 14.

  The food additive calcium hydroxide allows part of it to be replaced with food additive magnesium oxide. The amount of the food additive magnesium oxide substituted is preferably 50% by weight or less of the food additive calcium hydroxide.

  The dry mixing may be performed at a stage before shipment or may be performed at the time of use by a user.

  Next, a method for regenerating degraded edible oil according to an embodiment will be described.

The method for regenerating degraded edible oil according to this embodiment has a total specific surface area of 350 m ² / g or more, a pore shape having a distribution maximum in the range of 4 to 50 nm in pore diameter, and a V _l -t method. Deteriorated edible oil heated to 200 ° C. or less to a edible oil regenerator obtained by dry-mixing food additive silicon dioxide and food additive calcium hydroxide with the calculated external surface area accounting for 80% or more of the total specific surface area Make contact.

  As the edible oil regenerating agent, the same as described above is used.

  The lower limit temperature of the heated deteriorated edible oil is preferably 70 ° C.

  The operation for bringing the heated edible edible oil into contact with the edible oil regenerant is performed by, for example, connecting an edible oil storage container having a heating source and a regenerant container storing the edible oil regenerant through a circulation channel. Then, it is possible to employ a method in which the deteriorated edible oil heated in the edible oil container is supplied and circulated to the regenerant container through the circulation flow path and repeatedly contacted with the edible oil regenerant.

As described above, the regenerated agent for deteriorated edible oil according to the embodiment has a total specific surface area of 350 m ² / g or more, a pore shape having a distribution maximum in a range of pore diameters of 4 to 50 nm, that is, mesopores, and V _l Addition of food having a high adsorption capacity for pigment components in degraded edible oil in contact with degraded edible oil heated to, for example, 200 ° C. or less, with the external surface area calculated by the -t method accounting for 80% or more of the total specific surface area Because it is formed by dry mixing the food additive calcium hydroxide having the acid value reducing ability in the deteriorated edible oil without depending on the heating temperature in contact with the silicon dioxide and the deteriorated edible oil, Deteriorated edible oil can be effectively decolorized and regenerated with a reduced acid value.

  In particular, when the blending weight of the food additive silicon dioxide is M1, and the blending weight of the food additive calcium hydroxide is M2, M1 / M2 is set to 2.3 to 20 at the time of regeneration of deteriorated edible oil. Balanced decolorization and reduction of acid value can be achieved.

  In addition, the regenerated agent for deteriorated edible oils according to the embodiment includes, for example, a food additive silicon dioxide and a food additive calcium hydroxide that are suitable for the test according to the quantitative method of the 7th edition Food Addendum D-1009. Since it is a dry mixture that does not change, it has high safety.

  According to the method for regenerating degraded edible oil according to the embodiment, the amount of edible oil regenerant is less than that of degraded edible oil (for example, edible oil regenerant 0.5 to 10 parts per 100 parts by weight of degraded edible oil) Part by weight), it is possible not only to reduce the acid value of the deteriorated oil, but also to adsorb (decolorize) the pigment component to enable repeated use of the edible oil.

  Hereinafter, embodiments of the present invention will be described in detail.

(Example 1-1)
Into a tank which is a reaction vessel, 2.5 L of water was charged and this water was heated to 40 ° C. Subsequently, 532 g of commercially available No. 3 sodium silicate and a magnesium sulfate solution (a solution obtained by dissolving 175 g of heptahydrate crystals in water to make 300 mL) were added dropwise while stirring the heated water. A slurry was prepared by adding 110 g of 70% sulfuric acid to the solution after completion of the dropwise addition. The obtained slurry was filtered, washed with water, dried, and ground in a mortar to obtain 148 g of silicon dioxide.

  The obtained silicon dioxide was tested in accordance with the quantitative method of 7th edition Food Additives Official Document D-1009 [Silicon Dioxide]. As a result, the content of silicon dioxide was 99.1%.

Further, the obtained silicon dioxide was determined the ratio of external surface area to the total specific surface area, the external surface area and the total specific surface area was calculated by the V _l -t method according to the BET method based on the following test.

Method for measuring pore distribution of regenerant This measuring method was performed using the following apparatus and analysis conditions.

・ Device: High-speed specific surface area / pore distribution measuring device (trade name) manufactured by Quantachrome
NOVA4000e type)
-Pretreatment conditions: 0.03-0.1 g of sample was dried at 110 ° C. for 2 hours,
Accurately measured and sealed in an adsorption tube, then at 10 ^-3 torr or less
Degassed at 150 ° C. for 5 hours.

-Total specific surface area: Multipoint BET method-Pore distribution: BJH method-External surface area: _Vl- t method.

As a result, silicon dioxide total specific surface area obtained 645m ² / g, the external surface area of 513m ² / g, the ratio of external surface area to the total specific surface area was about 80%.

Then, 210 mg of silicon dioxide particles and 90 mg of food additive calcium hydroxide (trade name: Food additive calcium hydroxide manufactured by Tomita Pharmaceutical Co., Ltd.) were dry-mixed to prepare 300 mg of a regenerating agent for deteriorated edible oil. In addition, M1 / M2 [SiO ₂ / Ca (OH) ₂ ] of the regenerated agent for deteriorated edible oil is about 2.3.

(Example 1-2)
210 mg of silicon dioxide particles similar to Example 1-1, 75 mg of food additive calcium hydroxide (trade name manufactured by Tomita Pharmaceutical Co., Ltd .: food additive calcium hydroxide) and magnesium oxide of food additive (trade name manufactured by Tomita Pharmaceutical Co., Ltd .: food) Additive magnesium oxide (15 mg) was dry-mixed to prepare a regenerated agent for deteriorated edible oil (300 mg). Note that M1 / M2 {SiO ₂ / [Ca (OH) ₂ + MgO]} of the regenerated agent for deteriorated edible oil is about 2.3.

(Example 2-1)
270 mg of silicon dioxide particles similar to Example 1-1 and 30 mg of food additive calcium hydroxide (trade name: food additive calcium hydroxide manufactured by Tomita Pharmaceutical Co., Ltd.) were dry mixed to obtain 300 mg of a regenerating agent for deteriorated edible oil. Prepared. Note that the M1 / M2 [SiO ₂ / Ca (OH) ₂ ] of the regenerated agent for deteriorated edible oil is 9.

(Example 2-2)
270 mg of silicon dioxide particles similar to Example 1-1, 21 mg of food additive calcium hydroxide (trade name: food additive calcium hydroxide) manufactured by Toda Pharmaceutical Co., Ltd. and magnesium oxide of food additive (trade name: food manufactured by Tomita Pharmaceutical Co., Ltd .: food) 300 mg of a regenerating agent for deteriorated edible oil was prepared by dry-mixing 9 mg of additive magnesium oxide). In addition, M1 / M2 {SiO ₂ / [Ca (OH) ₂ + MgO]} of the regenerated agent for deteriorated edible oil is 9.

(Example 3-1)
294 mg of regenerated agent for deteriorated edible oil was obtained by dry-mixing 280 mg of silicon dioxide particles similar to Example 1-1 and 14 mg of food additive calcium hydroxide (trade name: food additive calcium hydroxide) manufactured by Tomita Pharmaceutical Co., Ltd. Prepared. Note that the M1 / M2 [SiO ₂ / Ca (OH) ₂ ] of the regenerated agent for deteriorated edible oil is 20.

(Example 3-2)
280 mg of silicon dioxide particles similar to Example 1-1, 12 mg of food additive calcium hydroxide (trade name: food additive calcium hydroxide) manufactured by Toda Pharmaceutical Co., Ltd. and magnesium oxide of food additive (trade name: food manufactured by Tomita Pharmaceutical Co., Ltd .: food) 294 mg of a regenerating agent for deteriorated edible oil was prepared by dry mixing 2 mg of additive magnesium oxide). In addition, M1 / M2 {SiO ₂ / [Ca (OH) ₂ + MgO]} of the regenerated agent for deteriorated edible oil is 20.

(Comparative Example 1)
Regenerative agent for deteriorated edible oil 300 mg was prepared by dry-mixing 210 mg of Wako Pure Chemicals; 210 mg of acid clay and 90 mg of food additive calcium hydroxide (trade name: food additive calcium hydroxide) manufactured by Tomita Pharmaceutical Co., Ltd. . In addition, M1 / M2 [acid clay / Ca (OH) ₂ ] of the regenerated agent for deteriorated edible oil is about 2.3.

(Comparative Example 2)
Regenerant for degraded edible oil 300 mg was prepared by dry-mixing 270 mg of Wako Pure Chemical Industries, Ltd .; acid clay 270 mg and food additive calcium hydroxide (trade name: Tomita Pharmaceutical Co., Ltd .: food additive calcium hydroxide) 30 mg. . In addition, the M1 / M2 [acid clay / Ca (OH) ₂ ] of the regenerated agent for deteriorated edible oil is 9.

(Comparative Example 3)
294 mg of regenerated agent for deteriorated edible oil was prepared by dry-mixing 280 mg of Wako Pure Chemicals; 280 mg of acid clay and 14 mg of food additive calcium hydroxide (trade name: food additive calcium hydroxide) manufactured by Tomita Pharmaceutical Co., Ltd. . In addition, M1 / M2 [acid clay / Ca (OH) ₂ ] of the regenerated agent for deteriorated edible oil is 20.

  Inferior edible oil (70 ° C.) using the obtained regenerated agents for deteriorated edible oils of Examples 1-1, 1-2, 2-1, 2-2, 3-1, 3-2 and Comparative Examples 1-3. , 100 ° C. and 150 ° C.), the reduction of the acid value and the decolorization rate were measured by the following test.

1) Test for measuring the decolorization rate of edible oil with a regenerant Regeneration agent 300 mg (Example 3) to 10 mL of used degraded oil of common beet oil (trade name: Golden Soybean White Squeezed Oil, manufactured by J-Oil Mills Co., Ltd.) −1, 3-2, Comparative Example 3 was added with 294 mg of a regenerant, that is, 3 parts by weight (or 2.94 parts by weight) of the regenerant was added to 100 parts by volume of deteriorated oil, and then 70 ° C., 100 ° C. and 150 ° C. The mixture was shaken for 15 minutes on a shaker at 130 times / minute in an oil bath at 0 ° C. Immediately after shaking, the solution was filtered through a membrane filter (aperture 0.8 μm), and the absorbance of the obtained filtrate was measured. 10 mL of the same used deteriorated oil with no regenerant added was used as a blank, the same treatment was performed, and the absorbance of the filtrate was measured. These measurement results were introduced into the writing formula to determine the decolorization rate (%).

Color rate (%) = [(absorbance of blank−absorbance after decoloring treatment) / absorbance of blank]
× 100
2) Edible oil acid value test after regeneration treatment with a regenerant Regeneration agent 300 mg (Example 3-1) to 10 mL of used degraded oil of common sugar beet oil (trade name: Golden Soybean White Squeezed Oil Co., Ltd.) 3-2 and Comparative Example 3 were added with a regenerant (294 mg), and then shaken in an oil bath at 70 ° C., 100 ° C., and 150 ° C. for 15 minutes on a shaker at 130 times / minute. Immediately after shaking, the mixture was filtered through a membrane filter (aperture 0.8 μm). About the obtained filtrate, the acid value was measured according to the "7th edition food additive official document manual" general test method (B194 oils and fats test method "3. acid value").

These results are shown in Table 1 below.

As apparent from Table 1, the total specific surface area is 350 m ² / g or more, the pore morphology has a distribution maximum in the range of pore diameters of 4 to 50 nm, and the external surface area calculated by the V _l -t method is The regenerants of Examples 1-1, 2-1, and 3-1 in which food additive silicon dioxide occupying 80% or more of the total specific surface area and food additive calcium hydroxide are dry-mixed are less than deteriorated edible oil. The regenerant of Comparative Examples 1 to 3 which is dry-mixed with acid clay and food additive calcium hydroxide in an amount and has an inferior acid value reducing effect, and more highly decolorized than the regenerants of Comparative Examples 1 to 3 It can be seen that the rate is shown.

  In addition, the regenerating agent of Examples 1-2, 2-2, and 3-2 in which a part of the food additive calcium hydroxide is replaced with food additive magnesium oxide is the same as Example 1 in which the food additive magnesium oxide is not substituted. Although the acid value reduction effect is slightly inferior to the regenerants of 1, 2-1, 3-1, it is higher than the regenerants of Comparative Examples 1 to 3 in which acidic clay and food additive calcium hydroxide are dry mixed. It can be seen that the color removal rate is indicated.

Claims (6)

The total specific surface area is 350 m ² / g or more, the pore morphology has a distribution maximum in the pore diameter range of 4 to 50 nm, and the external surface area calculated by the V _l -t method is 80% or more of the total specific surface area. A regenerating agent for deteriorated edible oils obtained by dry-mixing food additive silicon dioxide and food additive calcium hydroxide.   The deteriorated edible food according to claim 1, wherein M1 / M2 is 2.3 to 20, where M1 is a blending weight of the food additive silicon dioxide, and M2 is a blending weight of the food additive calcium hydroxide. Regenerant for oil.   The regenerated agent for deteriorated edible oil according to claim 1, wherein a part of the food additive calcium hydroxide is substituted with food additive magnesium oxide. The total specific surface area is 350 m ² / g or more, the pore morphology has a distribution maximum in the pore diameter range of 4 to 50 nm, and the external surface area calculated by the V _l -t method is 80% or more of the total specific surface area. A method for regenerating deteriorated edible oil, comprising bringing a deteriorated edible oil heated to 200 ° C. or less into contact with a regenerated agent for edible oil obtained by dry-mixing food additive silicon dioxide and food additive calcium hydroxide .   The edible oil regenerative agent is characterized in that M1 / M2 is 2.3 to 20, where M1 is the weight of the food additive silicon dioxide and M2 is the weight of the food additive calcium hydroxide. The method for regenerating a degraded edible oil according to claim 4.   The method for regenerating degraded edible oil according to claim 4, wherein a part of the food additive calcium hydroxide is substituted with food additive magnesium oxide.