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CN-122012180-A - Frying oil purification method

CN122012180ACN 122012180 ACN122012180 ACN 122012180ACN-122012180-A

Abstract

The invention relates to the technical field of frying oil treatment, in particular to a frying oil purification method which comprises the steps of preparing an oxidation resistant piece, wherein the oxidation resistant piece consists of stainless steel, a microporous silicon dioxide layer, vitamin E and a slow release film, putting the oxidation resistant piece into frying oil in advance to start frying operation, taking out the oxidation resistant piece after the frying operation is finished, separating and treating food residues to obtain rough filtered oil, adding a modified adsorbent into the rough filtered oil, heating and stirring to perform adsorption purification, taking out the modified adsorbent after the adsorption purification is finished, and filtering the modified adsorbent, wherein the modified adsorbent consists of activated clay and magnesium silicate. The invention utilizes the activated clay, sodium silicate and magnesium sulfate to prepare the modified adsorbent so as to lead the activated clay and the magnesium silicate to be compounded, wherein the activated clay has strong deacidification and decoloration capability, the magnesium silicate has selective depolarization and low oil loss, and the two compounds have complementary advantages, thus realizing the efficient purification of frying oil.

Inventors

  • ZHU GUANJUN
  • SUN SHUGUO
  • NING HAIMING
  • LAN RONGBO
  • ZHU SHANGHUI
  • CHENG XIANG

Assignees

  • 湖南飘香食品有限公司

Dates

Publication Date
20260512
Application Date
20260319

Claims (10)

  1. 1. A method of purifying frying oil, comprising the steps of: (1) Preparing an antioxidation component, wherein the antioxidation component consists of stainless steel, a microporous silicon dioxide layer, vitamin E and a sustained-release film; (2) Putting the antioxidant into frying oil in advance to start frying operation, taking out the antioxidant after finishing the frying operation, separating, and removing food residues to obtain rough filtered oil; (3) Adding the modified adsorbent into the crude oil, heating and stirring for adsorption and purification, taking out after the adsorption and purification are finished, and filtering, wherein the modified adsorbent consists of activated clay and magnesium silicate.
  2. 2. The method of claim 1, wherein in step (1), the antioxidant member is prepared by: s11, stirring and dissolving a surfactant in 40wt% ethanol solution, sequentially stirring and adding ammonia water and tetraethoxysilane, and reacting for 1.5-2.5 hours at 40-50 ℃ to obtain silica sol; S12, immersing the stainless steel into the silica sol for 10-20min, and then slowly pulling to enable the silica sol to be uniformly attached to the surface of the stainless steel, so as to obtain the pretreated stainless steel; s13, firstly reacting the pretreated stainless steel for 2-3 hours at 60-70 ℃, then roasting for 3-4 hours at 450-500 ℃, and forming a microporous silicon dioxide layer on the surface of the stainless steel to obtain the stainless steel with a silicon layer; S14, immersing the silicon-containing layer stainless steel into the antioxidation liquid for ultrasonic treatment for 1-1.5h, taking out and drying, immersing the obtained silicon-containing layer antioxidation stainless steel into the ethylcellulose solution for treatment for 10-20min, taking out and drying, and forming a slow-release film on the microporous silicon dioxide layer to obtain the antioxidation piece.
  3. 3. The method for purifying frying oil according to claim 2, wherein in the step S11, P123 is used as the surfactant, the ratio of the surfactant to the ethanol solution is 1:50g/mL, and the mass ratio of the surfactant, the ammonia water and the ethyl orthosilicate is 1:4:4.5.
  4. 4. The method for purifying frying oil according to claim 2, wherein in step S14, the antioxidant liquid is prepared by mixing vitamin E and absolute ethanol in a mass ratio of 1:2.
  5. 5. The method according to claim 2, wherein in step S14, the ethylcellulose solution is prepared by mixing ethylcellulose and absolute ethanol in a feed liquid ratio of 1:15 g/mL.
  6. 6. The method for purifying frying oil according to claim 1, wherein in the step (2), the antioxidant is 3% or more of the mass of the frying oil, in the step (3), the heating and stirring are performed at 60 to 80 ℃ for 40 to 50 minutes, and the modified adsorbent is 2 to 3% of the mass of the crude oil.
  7. 7. The method for purifying frying oil according to claim 1, wherein in the step (3), the modified adsorbent is prepared as follows: s21, ultrasonically dispersing activated clay in deionized water to obtain a suspension; S22, adding a sodium silicate solution and a magnesium sulfate solution into the suspension by stirring, adjusting the pH to 7.5, and continuously stirring for 1.5-2 hours to obtain a mixture; S23, filtering, washing and drying the mixture to obtain the modified adsorbent.
  8. 8. The method of purifying frying oil as claimed in claim 7, wherein in the step S21, the ratio of the activated clay to deionized water is 1:5g/mL.
  9. 9. The method according to claim 7, wherein in step S22, the sodium silicate solution is prepared by mixing sodium silicate and deionized water at a feed liquid ratio of 1.5:10g/mL, and the magnesium sulfate solution is prepared by mixing magnesium sulfate and deionized water at a feed liquid ratio of 1:5 g/mL.
  10. 10. The method for purifying frying oil according to claim 9, wherein the mass ratio of the activated clay, sodium silicate and magnesium sulfate is 1:0.3:0.5.

Description

Frying oil purification method Technical Field The invention relates to the technical field of frying oil treatment, in particular to a frying oil purification method. Background In the frying process of food, the frying oil is subjected to hydrolysis, oxidization, polymerization and other reactions under the interaction of high temperature, moisture in the food, oxygen and other factors, so that polar component substances such as free fatty acid, oxidized triglyceride, oxidized glyceride polymer and the like are generated, and meanwhile, the acid value of the frying oil is gradually increased. When the acid value and/or polar component content of the frying oil exceeds the hygienic standard, it is necessary to dispose of the oil, which causes a great deal of waste of the frying oil. The frying oil can be purified by the adsorbent at present, the acid value and polar components of the frying oil are reduced, and the frying oil meets the sanitary standard for secondary use, but the service life of the frying oil is relatively short. Based on this, a frying oil purification method is proposed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a frying oil purification method, which prolongs the service life of frying oil within the safety and sanitation standard and simultaneously realizes the efficient purification of the frying oil. In order to achieve the above purpose, the invention provides a technical scheme that the frying oil purifying method comprises the following steps, (1) Preparing an antioxidation component, wherein the antioxidation component consists of stainless steel, a microporous silicon dioxide layer, vitamin E and a sustained-release film; (2) Putting the antioxidant into frying oil in advance to start frying operation, taking out the antioxidant after finishing the frying operation, separating, and removing food residues to obtain rough filtered oil; (3) Adding the modified adsorbent into the crude oil, heating and stirring for adsorption and purification, taking out after the adsorption and purification are finished, and filtering, wherein the modified adsorbent consists of activated clay and magnesium silicate. The preparation method of the oxidation resistant member comprises the steps of S11, stirring and dissolving a surfactant in 40wt% ethanol solution, sequentially stirring and adding ammonia water and tetraethoxysilane, reacting for 1.5-2.5h at 40-50 ℃ to obtain silica sol, S12, immersing stainless steel in the silica sol for 10-20min, slowly pulling to enable the silica sol to be uniformly adhered to the surface of the stainless steel to obtain the pre-treated stainless steel, S13, firstly reacting the pre-treated stainless steel for 2-3h at 60-70 ℃, then roasting for 3-4h at 450-500 ℃ to form a microporous silica layer on the surface of the stainless steel to obtain the silicon-containing layer stainless steel, S14, immersing the silicon-containing layer stainless steel in the oxidation resistant solution for 1-1.5h, taking out and drying, immersing the obtained silicon-containing layer oxidation resistant stainless steel in the ethyl cellulose solution for 10-20min, taking out and drying to form a slow-release film on the microporous silica layer to obtain the oxidation resistant member. Preferably, in step S11, the surfactant adopts P123, the feed liquid ratio of the surfactant to the ethanol solution is 1:50g/mL, and the mass ratio of the surfactant, ammonia water and tetraethoxysilane is 1:4:4.5. Preferably, in step S14, the antioxidant solution is formed by mixing vitamin E and absolute ethanol according to a mass ratio of 1:2. Preferably, in step S14, the ethylcellulose solution is formed by mixing ethylcellulose and absolute ethanol according to a feed liquid ratio of 1:15 g/mL. Preferably, in the step (2), the antioxidant element accounts for more than 3% of the mass of the frying oil, in the step (3), the heating and stirring are carried out at 60-80 ℃ for 40-50min, and the modified adsorbent accounts for 2-3% of the mass of the rough filtered oil. Preferably, in the step (3), the preparation method of the modified adsorbent comprises the following steps of S21, dispersing activated clay in deionized water by ultrasonic to obtain a suspension, S22, stirring and adding a sodium silicate solution and a magnesium sulfate solution into the suspension, adjusting the pH to 7.5, continuously stirring for 1.5-2 hours to obtain a mixture, and S23, filtering, washing and drying the mixture to obtain the modified adsorbent. Preferably, in step S21, the feed liquid ratio of the activated clay to the deionized water is 1:5g/mL. Preferably, in step S22, the sodium silicate solution is formed by mixing sodium silicate and deionized water according to a feed liquid ratio of 1.5:10g/mL, and the magnesium sulfate solution is formed by mixing magnesium sulfate and deionized water according to a feed liquid ratio of 1:5 g/mL. Preferably, the mass rati