Preparation method of non-numbing Zanthoxylum bungeanum seed edible oil

Abstract

The present invention provides a method for preparing a non-numbing Zanthoxylum bungeanum seed edible oil that not only has the effects of dispelling dampness and dispelling cold, but also has important functions such as anti-inflammatory, fat reduction, and lowering three highs. The method comprises the following steps: S1, washing and shelling red Zanthoxylum bungeanum to obtain red Zanthoxylum bungeanum seeds, drying to a moisture content of ≤8%, and then crushing to 20-80 meshes to obtain red Zanthoxylum bungeanum seed powder; S2, extracting the red Zanthoxylum bungeanum seed powder in a supercritical CO2 extraction and separation device to obtain Zanthoxylum bungeanum seed crude oil; S3, preliminarily decolorizing the Zanthoxylum bungeanum seed crude oil through a macroporous exchange resin, and then centrifuging at low temperature to obtain the upper layer oil; S4, refining the upper layer oil to obtain the oil. The edible oil prepared by the present invention has an acid value, color, and smell that meet the requirements. The edible oil has a low content of numbing substances, thereby increasing the palatability of the edible oil. At the same time, the content of unsaturated fatty acids such as α-linolenic acid is high, so that the prepared edible oil not only has the effects of dispelling dampness and dispelling cold, but also has important functions such as anti-inflammatory, fat reduction, and lowering three highs.

Description

Technical Field

[0001] The invention belongs to the technical field of pepper seed products, and particularly relates to a method for preparing non-numbing pepper tree seed edible oil. Background Art

[0002] Sichuan pepper (Scientific name: Zanthoxylum bungeanumMaxim) is a common condiment with a wide range of uses and significant economic value. In the production and processing of Sichuan pepper, Sichuan pepper seeds are an important by-product, accounting for about 60% of the total weight of Sichuan pepper. Although Sichuan pepper seeds are not often used directly in cooking, they are rich in nutritional value and potential economic value. Sichuan pepper seeds contain about 27% oil, which is not only considerable in quantity but also of high quality. The oil is rich in unsaturated fatty acids, which are essential for human health and help maintain normal physiological functions, especially α-linolenic acid, which has important physiological functions such as anti-inflammatory, antioxidant, anti-tumor, fat reduction, and lowering the three highs. Preparing Sichuan pepper seeds into Sichuan pepper seed oil can not only retain the unique dampness-removing and cold-relieving effects of Sichuan pepper, but also increase the fatty acid content and improve human health.

[0003] While some consumers prefer Sichuan pepper seed oil for its unique flavor, others prefer its nutritional and potential health benefits without the numbing taste. Therefore, developing a non-numbing Sichuan pepper seed oil could expand the market. Conventional Sichuan pepper seed oil extraction methods often have high acidity and dark color, failing to meet edible oil standards.

[0004] Therefore, it is necessary to develop a Sichuan pepper tree seed edible oil that can meet the standards of edible oil, has no numb taste, and has a high content of unsaturated fatty acids, especially α-linolenic acid, so as to achieve rich nutritional value and high palatability. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing non-numbing Zanthoxylum bungeanum seed edible oil. The method can significantly reduce the numbing components in the Zanthoxylum bungeanum seed edible oil, so that the prepared Zanthoxylum bungeanum seed edible oil can meet the edible oil standards and also has good palatability. At the same time, the content of unsaturated fatty acids such as α-linolenic acid is high, the nutritional value is rich, and while removing dampness and cold, it also has the effects of anti-inflammation, fat reduction, and lowering the three highs.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The method for preparing the non-numbing Zanthoxylum bungeanum seed edible oil comprises the following steps:

[0008] S1. Wash and shell red peppercorns to obtain red peppercorn seeds, dry them to a moisture content of ≤8%, and then crush them into 20-80 meshes to obtain red peppercorn seed powder;

[0009] S2, taking red prickly ash seed powder in a supercritical CO2 extraction and separation device to obtain prickly ash seed crude oil;

[0010] S3, after preliminary decolorization of the crude Zanthoxylum bungeanum seed oil by macroporous exchange resin, low-temperature centrifugation was performed to obtain the upper layer of oil;

[0011] S4. Refining the upper layer oil to obtain.

[0012] The drying method is: drying in a blast drying oven at 35-45°C.

[0013] The higher temperature combined with the blowing speed to accelerate the air flow speeds up the oxidation rate of the numbing substances, resulting in a greater loss of the numbing substances.

[0014] The conditions of the supercritical CO2 extraction are: extraction pressure 27-33 MPa, extraction time 2-3 h, extraction temperature 45-50°C, CO2 flow rate 18-23 kg / h, separator separation temperature 48-52°C, and separation pressure 12-18 MPa.

[0015] In some preferred embodiments, by setting specific extraction pressures and extraction times, it is possible to increase linolenic acid and oil extraction yield while reducing numbing substances in Sichuan pepper seeds. This is because numbing substances and unsaturated fatty acids such as linolenic acid have different solubilities in CO2. As pressure increases, the density of supercritical CO2 also increases, increasing the solubility of Sichuan pepper seed oil in CO2. The oil extraction yield and linolenic acid content increase with increasing pressure. Once pressure reaches a certain value, the effect on CO2 solubility decreases, so the oil extraction yield and linolenic acid content stabilize, but do not decrease with increasing pressure. However, higher pressures can reduce the content of numbing substances in the edible oil. This is because higher pressure gradually compacts the raw materials in the barrel, preventing CO2 from entering the tiny pores in the Sichuan pepper seeds. This reduces the contact area between CO2 and the seeds, thereby reducing the dissolution of numbing substances in the CO2 and, therefore, the content of numbing substances in the edible oil. At the same time, to further reduce the content of numbing substances in edible oils, the extraction time is extended so that some of the numbing substances dissolved in the CO2 can enter the gas circulation system along with the CO2, thereby reducing their yield. While long extraction times have little effect on linolenic acid and oil extraction rates, long extraction times can waste energy and increase costs.

[0016] Selecting a specific extraction temperature can increase linolenic acid and oil extraction rate, but the optimal extraction temperature for numbing substances overlaps with linolenic acid. Therefore, it is necessary to control the separation temperature and pressure to reduce the content of numbing substances in the crude oil. The separation of numbing substances primarily occurs in a separator. By setting a specific separation temperature and pressure, most of the numbing substances can enter the circulation system along with the CO2, reducing their content while leaving linolenic acid and oil extraction rate largely unaffected. Excessively high temperatures waste energy, while too low prevents most of the numbing substances from entering the circulation system, resulting in the final edible oil still having a numbing flavor. However, the crude oil after extraction and separation is dark in color, contains various impurities, and has a high acidity, failing to meet edible oil standards.

[0017] Preferably, the macroporous exchange resin is a weakly acidic cation exchange resin containing a -COOH functional group.

[0018] Preferably, the mass full exchange capacity of the weakly acidic cation exchange resin is ≥8 mmol / mL, the volume full exchange capacity is ≥1.7 mmol / mL, and the water content is 48% to 58%.

[0019] In some preferred embodiments, the weakly acidic cation exchange resin is purchased from Hebi Haige Chemical Technology Co., Ltd., D152.

[0020] The inventors discovered that using a specific macroporous cation exchange resin for preliminary treatment of crude oil can not only initially decolorize the crude oil but also remove a certain amount of numbing substances. This may be because, on the one hand, the specific macroporous cation exchange resin has numerous microporous structures within it, which increases the adsorption sites for pigments and other impurities. On the other hand, the macroporous cation exchange resin is weakly acidic, which reacts with hydroxy-α-sanshool and hydroxy-β-sanshool, the main components that cause numbing, thereby achieving the desired effect. However, adsorption by only the weakly acidic cation exchange resin still results in a darker oil color and a higher acid value, which does not meet edible oil standards.

[0021] Preferably, the specific methods of the refining treatment are: degumming, deacidification, and decolorization.

[0022] The specific method of degumming is as follows: adding 0.2% to 0.4% of phosphoric acid and 4% of water by weight to the upper layer oil obtained in step S3, reacting at a temperature of 25 to 30° C. for 15 to 25 minutes, allowing the oil to stand after the reaction, and centrifuging to obtain degummed oil.

[0023] The specific method of deacidification is: after heating the degummed oil to 70-80° C., adding 0.1%-0.2% of the oil weight of a 10wt% sodium hydroxide solution, the reaction time is 20-30 minutes, and after the reaction, the oil is allowed to stand and centrifuged to obtain the deacidified oil.

[0024] The specific decolorization method is: after heating the deacidified oil to 100-110° C., adding a decolorizer of 4%-6% by weight of the oil, stirring for 20-30 minutes, filtering after reaction, and centrifuging to obtain non-numbing Zanthoxylum bungeanum seed edible oil.

[0025] Preferably, the decolorizing agent is modified activated carbon and activated clay.

[0026] Preferably, the mass ratio of the modified activated carbon to the activated clay is 1:(7-10); more preferably, it is 1:9.

[0027] The preparation method of the activated white clay comprises the following steps: crushing bentonite through a 200-400 mesh sieve, mixing the mixture with a modifier solution, stirring the mixture at 90-100° C. for 3-5 hours, and then cooling the mixture to room temperature; removing the upper clear liquid to obtain a lower slurry; washing the lower slurry with water to a pH of 6-7, filtering the mixture, drying the filter cake to a constant weight, and crushing the mixture to an average particle size of less than 300 mesh.

[0028] Preferably, the montmorillonite content in the bentonite is ≥55%, and the apparent viscosity is 60-70 mPa·s; further preferably, the montmorillonite content in the bentonite is ≥60%, and the apparent viscosity is 65 mPa·s.

[0029] In some preferred embodiments, the bentonite is purchased from Jinhe Minerals (Huizhou) Co., Ltd.

[0030] Preferably, the modifier solution is any one of a sulfuric acid solution and a hydrochloric acid solution.

[0031] Preferably, the concentration of the modifier solution is 18% to 25%.

[0032] Preferably, the solid-liquid ratio of the bentonite and modifier solution is 1 g: 1-3 mL.

[0033] The inventors discovered that the activated clay prepared by selecting a specific bentonite and modifying it using a specific method has excellent adsorption properties and can also stabilize the acid value of the oil. This may be because sulfuric acid or hydrochloric acid is a strong acid with a high ionization constant, making it easier to ionize hydrogen ions, which replace the sodium ions, calcium ions, and potassium ions between the montmorillonite layers in the bentonite. The interlayers of the montmorillonite form pores due to the dissolution of metal cations, increasing the intercrystalline distance and thus improving the adsorption properties of the activated clay. At the same time, by controlling the modification conditions, the magnesium ions, iron ions, and aluminum ions in the octahedron are relatively difficult to dissolve, ensuring the stability of the activated clay structure and avoiding the situation where the acid value rises due to system instability. However, the edible oil bleached with activated clay has an odor, which affects the eating experience.

[0034] The preparation method of the modified activated carbon comprises the following steps:

[0035] The activated carbon is mixed with the activated carbon modifier, and calcined at 700-1000° C. for 1-3 hours in a nitrogen atmosphere to obtain the product.

[0036] Preferably, the activated carbon is coal-based activated carbon.

[0037] Preferably, the particle size of the coal-based activated carbon is 5-20 mesh, and the phenol adsorption capacity is ≥150 mg / g; further preferably, the particle size of the coal-based activated carbon is 8-20 mesh, and the phenol adsorption capacity is ≥160 mg / g.

[0038] In some preferred embodiments, the coal-based activated carbon is purchased from Zhejiang Zhelang Activated Carbon Co., Ltd.

[0039] Preferably, the activated carbon modifier is one or more of sodium hydroxide, potassium hydroxide, disodium ethylenediaminetetraacetate, and tetrasodium ethylenediaminetetraacetate; more preferably, it is sodium hydroxide and disodium ethylenediaminetetraacetate.

[0040] Preferably, the mass ratio of the activated carbon to the activated carbon modifier is 1:(2-5); more preferably, it is 1:4.

[0041] Preferably, the mass ratio of sodium hydroxide to disodium edetate is (1-4):1; more preferably, it is 3:1.

[0042] The inventors creatively discovered that using sodium hydroxide and disodium EDTA in a mass ratio of (1-4):1 as modifiers to modify a specific activated carbon, and when the mass ratio of the modified activated carbon to activated clay is 1:(7-10), the decolorization effect can be further improved while also removing odors, meeting the requirements of the national standard. This may be because, on the one hand, sodium hydroxide and disodium EDTA jointly modify the activated carbon, etching the carbon layer and introducing nitrogen-containing functional groups, thereby increasing the specific surface area and pore volume of the activated carbon, thereby improving its decolorization efficiency. On the other hand, the modified activated carbon and activated clay work synergistically, further improving the decolorization effect while removing odors, so that the edible oil prepared meets the requirements for both odor and color. However, the amount of modifier added must be strictly controlled. Excessive sodium hydroxide not only destroys the pore structure of the activated carbon, but also remains in the activated carbon pores, hindering adsorption. Excessive disodium EDTA residues after high-temperature calcination can also clog the pores.

[0043] The present invention also includes the Zanthoxylum bungeanum seed edible oil prepared by the preparation method of the non-numbing Zanthoxylum bungeanum seed edible oil.

[0044] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0045] 1. The present invention provides a method for preparing non-numbing Zanthoxylum bungeanum seed edible oil, which can significantly reduce the numbing components in the Zanthoxylum bungeanum seed edible oil, so that the prepared Zanthoxylum bungeanum seed edible oil can meet the edible oil standards while also having good palatability. At the same time, the oil is high in unsaturated fatty acids such as α-linolenic acid and has rich nutritional value. While removing dampness and cold, it also has the effects of anti-inflammatory, fat reduction, and lowering the three highs.

[0046] 2. The present invention selects a specific extraction pressure and extraction time, which can increase the linolenic acid and oil extraction rate while reducing the numbing substances in the pepper seeds.

[0047] 3. By setting a specific separation temperature and pressure, the present invention can allow most of the numbing substances to enter the circulation system along with CO2, thereby reducing their content. At the same time, the linolenic acid and oil extraction rate are basically unaffected.

[0048] 4. The present invention uses a specific macroporous exchange resin to perform preliminary treatment on the crude oil, which can not only perform preliminary decolorization on the crude oil, but also remove a certain amount of odorous substances.

[0049] 5. The present invention selects a specific bentonite and adopts a specific method to modify it to prepare the activated white clay, which has excellent adsorption properties and can also stabilize the acid value of the oil.

[0050] 6. Selecting sodium hydroxide and disodium ethylenediaminetetraacetic acid in a mass ratio of (1 to 4): 1 as modifiers to modify specific activated carbon, and when the mass ratio of the modified activated carbon to activated clay is 1: (7 to 10), the decolorization effect can be further improved, and the odor can also be removed, meeting the requirements of the national standard. DETAILED DESCRIPTION

[0051] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0052] The raw materials used in the present invention are all commercially available, specifically:

[0053] The coal-based activated carbon has a particle size of 8 to 20 meshes and a phenol adsorption capacity of ≥160 mg / g, and is purchased from Zhejiang Zhelang Activated Carbon Co., Ltd.

[0054] The weakly acidic cation exchange resin has a mass full exchange capacity of ≥8 mmol / mL, a volume full exchange capacity of ≥1.7 mmol / mL, and a water content of 48% to 58%. It was purchased from Hebi Haige Chemical Technology Co., Ltd., D152.

[0055] The bentonite has a montmorillonite content of ≥60% and an apparent viscosity of 65 mPa·s, and is purchased from Jinhe Minerals (Huizhou) Co., Ltd.

[0056] Example 1

[0057] This embodiment provides a method for preparing non-numbing Zanthoxylum bungeanum seed edible oil, comprising the following steps:

[0058] S1. Wash and shell red peppercorns to obtain red peppercorn seeds, dry them to a moisture content of about 5%, and then crush them into 50 mesh to obtain red peppercorn seed powder;

[0059] S2, taking red prickly ash seed powder in a supercritical CO2 extraction and separation device to obtain prickly ash seed crude oil;

[0060] S3, after preliminary decolorization of the crude Zanthoxylum bungeanum seed oil by macroporous exchange resin, low-temperature centrifugation was performed to obtain the upper layer of oil;

[0061] S4. Refining the upper layer oil to obtain.

[0062] The drying method is: drying in a blast drying oven at 40°C.

[0063] The conditions of the supercritical CO2 extraction are: extraction pressure 31 MPa, extraction time 2.5 h, extraction temperature 48°C, CO2 flow rate 20 kg / h, separator separation temperature 50°C, and separation pressure 15 MPa.

[0064] The specific methods of the refining treatment are: degumming, deacidification and decolorization.

[0065] The specific method of degumming is as follows: adding 0.3% phosphoric acid and 4% water by weight of the oil to the upper layer oil obtained in step S3, the reaction temperature is 28° C., the reaction time is 20 minutes, and after the reaction, the oil is allowed to stand and centrifuged to obtain the degummed oil.

[0066] The specific method of deacidification is: after heating the degummed oil to 75° C., adding 0.15% of the oil weight of a 10wt% sodium hydroxide solution, the reaction time is 25 minutes, and after the reaction, the oil is allowed to stand and centrifuged to obtain the deacidified oil.

[0067] The specific decolorization method is: take the deacidified oil and heat it to 105° C., add a decolorizer of 5% by weight of the oil, stir for 25 minutes, filter after reaction, and obtain the non-numbing Zanthoxylum bungeanum seed edible oil after centrifugation.

[0068] The decolorizing agents are modified activated carbon and activated clay.

[0069] The mass ratio of the modified activated carbon to the activated clay is 1:9.

[0070] The preparation method of the activated white clay comprises the following steps: crushing bentonite through a 325-mesh sieve, mixing the mixture with a modifier solution, stirring the mixture at 95° C. for 4 hours, cooling the mixture to room temperature, removing the supernatant to obtain a lower-layer slurry, washing the lower-layer slurry with water to a pH of 6.5, filtering the mixture, drying the filter cake to a constant weight, and crushing the mixture to obtain activated white clay with an average particle size of 325 mesh.

[0071] The modifier solution is a sulfuric acid solution.

[0072] The concentration of the modifier solution is 20%.

[0073] The solid-to-liquid ratio of the bentonite and modifier solution is 1 g:2 mL.

[0074] The preparation method of the modified activated carbon comprises the following steps:

[0075] The activated carbon is mixed with the activated carbon modifier and calcined at 900°C for 2h in a nitrogen atmosphere to obtain the product.

[0076] The activated carbon is coal-based activated carbon.

[0077] The activated carbon modifiers are sodium hydroxide and disodium ethylenediaminetetraacetate.

[0078] The mass ratio of the activated carbon to the activated carbon modifier is 1:4.

[0079] The mass ratio of the sodium hydroxide to disodium edetate is 3:1.

[0080] Example 2

[0081] The difference between this embodiment and embodiment 1 is that the conditions of the supercritical CO2 extraction are: extraction pressure 28 MPa, extraction time 2 h, extraction temperature 50°C, CO2 flow rate 23 kg / h, separator separation temperature 52°C, and separation pressure 17 MPa.

[0082] Example 3

[0083] The difference between this embodiment and embodiment 1 is that the mass ratio of the modified activated carbon to the activated clay is 1:7.

[0084] Comparative Example 1

[0085] The difference between this comparative example and Example 1 is that the extraction pressure is 25 MPa and the extraction time is 3 h.

[0086] Comparative Example 2

[0087] The difference between this comparative example and Example 1 is that the separation temperature of the separator is 40° C. and the separation pressure is 15 MPa.

[0088] Comparative Example 3

[0089] The difference between this comparative example and Example 1 is that the macroporous exchange resin is a weakly basic anion exchange resin containing -NH3 functional groups.

[0090] The weakly basic anion exchange resin has a total exchange capacity of ≥1.45 mmol / mL and a water content of 48% to 58%. The weakly basic anion exchange resin was purchased from Tianjin Yinghai Chemical Group Co., Ltd., D301.

[0091] Comparative Example 4

[0092] The difference between this comparative example and Example 1 is that the mass ratio of the modified activated carbon to the activated clay is 1:5.

[0093] Comparative Example 5

[0094] The difference between this comparative example and Example 1 is that the modifier solution is a 20 wt % phosphoric acid solution, which is a medium-strong acid.

[0095] Comparative Example 6

[0096] The difference between this comparative example and Example 1 is that the activated carbon is not modified.

[0097] Comparative Example 7

[0098] The difference between this comparative example and Example 1 is that the mass ratio of the sodium hydroxide to disodium edetate is 5:1.

[0099] Performance Testing

[0100] The acid value and color were tested for compliance with requirements according to the methods in GB / T 22479-2008, "Zanthoxylum bungeanum Seed Oil." The numbing substances in Zanthoxylum bungeanum seed oil were tested according to DB50 / T 321-2009, "Determination of Numbing Substances in Zanthoxylum bungeanum - High-Performance Liquid Chromatography." The α-linolenic acid content in Zanthoxylum bungeanum seed oil was tested according to GB 28404-2012, "Determination of α-linolenic acid, decosapentaenoic acid, docosapentaenoic acid, and docosahexaenoic acid in health foods." The results are shown in Table 1.

[0101] Table 1 Measurement results

[0102]

[0103] According to statistics, the Zanthoxylum bungeanum seed edible oil prepared in Examples 1 to 3 of the present invention has a low acid value and a color that meets the requirements of edible oil. It also contains less numbing substances and a high content of α-linolenic acid. In comparative example 1, the extraction pressure is too low, in comparative example 2, the separation temperature of the separator is too low, in comparative example 3, a weakly basic anion exchange resin is selected, in comparative example 4, the amount of activated clay added is too low, in comparative example 5, a medium-strong acid is selected to prepare the activated clay, and the ionization constant is low, in comparative example 6, the activated carbon is not modified, and in comparative example 7, the amount of sodium hydroxide added is too high. The prepared Zanthoxylum bungeanum seed edible oils do not fully meet the requirements of edible oils, and at the same time, have a low numb taste and a high content of the nutrient α-linolenic acid. Therefore, the acid value, color, and smell of the Zanthoxylum bungeanum seed edible oils prepared by the method described in the present application all meet the standards of GB 2716-2018 "National Food Safety Standard Vegetable Oil". The content of numb substances in the edible oil is low, thereby increasing the palatability of the edible oil. At the same time, the content of unsaturated fatty acids such as α-linolenic acid is high, so that the prepared edible oil not only has the effects of removing dampness and dispelling cold, but also has important effects such as anti-inflammatory, fat reduction, and lowering the three highs.

[0104] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for preparing non-numbing Zanthoxylum bungeanum seed edible oil, characterized in that: The following steps are involved: S1. Wash and shell red peppercorns to obtain red peppercorn seeds, dry them to a moisture content of ≤8%, and then crush them to 20-80 mesh to obtain red peppercorn seed powder; S2. Take the red peppercorn seed powder and place it in a supercritical CO2 extraction and separation device to obtain peppercorn seed crude oil; S3. Preliminary decolorization of the peppercorn seed crude oil is performed by macroporous exchange resin, and then low-temperature centrifugation is performed to obtain the upper layer oil; S4. Refining the upper layer oil to obtain; the conditions of the supercritical CO2 extraction are: extraction pressure 27-31MPa, extraction time 2.5-3h, extraction temperature 45-48℃, CO2 flow rate 18-23kg / h, separator separation temperature 50-52℃, and separation pressure 15-18MPa; the macroporous exchange resin is a weakly acidic cation exchange resin containing -COOH functional groups; the mass full exchange capacity of the weakly acidic cation exchange resin is ≥8mmo l / mL, total exchange capacity of volume ≥1.7mmol / mL, water content of 48% to 58%; the specific method of the refining treatment is: degumming, deacidification, and decolorization; the specific method of the degumming is: taking the upper layer oil obtained in step S3, adding 0.2% to 0.4% of the oil weight of phosphoric acid and 4% of water, the reaction temperature is 25 to 30°C, the reaction time is 15 to 25 minutes, and after the reaction, standing and centrifuging to obtain degummed oil; the specific method of the deacidification is: taking the degummed oil and heating it to 70 to 80°C, adding 0.1% to 0.2% of the concentration of 10wt% sodium hydroxide solution, the reaction time is 20-30min, after the reaction, let it stand, centrifuge to obtain deacidified oil; the specific decolorization method is: take the deacidified oil and heat it to 100-110℃, add 4%-6% of the oil weight of the decolorizer, stir for 20- 30min, filter after reaction, and obtain non-numbing Zanthoxylum bungeanum seed edible oil after centrifugation; the decolorizing agent is modified activated carbon and activated clay with a mass ratio of 1:9; the preparation method of the modified activated carbon comprises the following steps: mixing the activated carbon and the activated carbon modifier, calcining them at 900°C in a nitrogen atmosphere for 2h, and obtaining the activated carbon; the activated carbon is coal-based activated carbon, the particle size of the coal-based activated carbon is 5-20 mesh, the phenol adsorption amount is ≥150mg / g, and it is purchased from Zhejiang Zhelang Activated Carbon Co., Ltd.; the mass ratio of the activated carbon and the activated carbon modifier is 1:4; the activated carbon modifier is sodium hydroxide and disodium ethylenediaminetetraacetic acid, and the mass ratio of sodium hydroxide and disodium ethylenediaminetetraacetic acid is 3:1; the preparation method of the activated clay comprises the following steps: crushing the bentonite through a 200-400 mesh sieve and mixing it with the modifier solution, calcining it at 90-100°C After stirring for 3-5 hours, the mixture is cooled to room temperature, and the supernatant liquid is removed to obtain a lower slurry. The lower slurry is washed with water until the pH reaches 6-7, filtered, and the filter cake is dried to a constant weight and crushed to an average particle size of less than 300 mesh. The bentonite has a montmorillonite content of ≥55% and an apparent viscosity of 60-70 mPa·s. The modifier solution is a sulfuric acid solution with a concentration of 20%. The solid-to-liquid ratio of the bentonite to the modifier solution is 1g:2mL.

2. A Zanthoxylum bungeanum seed edible oil prepared according to the method for preparing the non-numbing Zanthoxylum bungeanum seed edible oil according to claim 1.

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