Method for promoting chemical refining of rice bran oil by nanocavitation

Abstract

The application provides a method for promoting chemical refining of rice bran oil by nano cavitation and relates to the field of grain and oil. The method comprises the following steps: adding phosphoric acid to rice oil to obtain a mixed solution, performing nano cavitation reaction on the mixed solution, adding water to mix to obtain a gum, and separating the gum to obtain impurities and degummed oil; and the degummed oil is dried, decolorized, deacidified and deodorized to obtain rice bran oil. Compared with a traditional solvent leaching method, the extraction time can be greatly shortened, the extraction time of some oil materials can be shortened by 30-50%, and the use amount of organic solvents is reduced, which is more environmentally friendly.

Description

Technical Field

[0001] This application relates to the field of grains and oils, and in particular to a method for promoting the chemical refining of rice bran oil through nanocavitation. Background Technology

[0002] Hydration degumming is used to remove hydrated phospholipids from oils. When the content of non-hydrated phospholipids is high, acid degumming is required. However, phosphoric acid in acid degumming can cause many problems, such as causing discoloration and odor in the finished oil, contamination of the oil by heavy metal ions it carries, and increasing the amount of alkali used in the alkali refining process. This can lead to saponification of neutral oils, a decrease in refining rate, and an increase in the amount of water used for subsequent washing and the amount of bleaching clay used.

[0003] Nanocavitation technology utilizes a high-pressure pump to transport degummed oil (or crude oil) and alkali solution into a nanoreactor. Under high pressure, the oil and alkali mixture forms a high-speed turbulent flow, generating high shear forces that break down molecular clusters and rapidly complete the acid-base reaction. Simultaneously, the hydraulic cavitation within the nanoreactor generates strong shock waves that break the weak bonds between non-hydrated phospholipids and calcium and magnesium ions in the vegetable oil, causing the non-hydrated phospholipids to be converted into hydrated phospholipids and removed, and also allowing the acid-base solution to mix better with the crude oil.

[0004] The widespread application of nano-cavitation technology will revolutionize the oil and fat industry, reducing various forms of consumption, increasing refining yield, and saving energy. Therefore, how to apply nano-cavitation technology to improve production capacity and reduce costs has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a method for promoting the chemical refining of rice bran oil through nanocavitation, so as to solve the above-mentioned problems.

[0006] To achieve the above objectives, this application adopts the following technical solution: This application provides a method for promoting the chemical refining of rice bran oil using nanocavitation, the method comprising: Rice bran oil is mixed with phosphoric acid to obtain a mixture, the mixture is subjected to a nano-cavitation reaction, and water is added to obtain a gum. The gum is then separated to obtain impurities and degummed oil. The degummed oil is dried, decolorized, deacidified, and deodorized to obtain rice bran oil.

[0007] Optionally, the rice bran oil contains 11,000-13,000 ppm of oryzanol.

[0008] Optionally, the concentration of phosphoric acid is 80-90 wt%, and the amount added is 0.05-0.1 wt% of the amount of rice bran oil used.

[0009] Optionally, the nanocavitation reaction is carried out in a nanoreactor.

[0010] Optionally, the inlet pressure of the nanoreactor is 5.5-6.5 MPa, and the outlet pressure is 3-4 MPa.

[0011] Optionally, the temperature of the nanocavitation reaction is 50-70℃, and the reaction time is 5-20 min.

[0012] Optionally, the power consumption per ton of said rice bran oil is 2.5-4 kW.

[0013] Optionally, during the nanocavitation reaction, microbubbles are formed inside the mixture, and the diameter of the microbubbles is 10-1000 nm.

[0014] Optionally, the content of oryzanol is not less than 10,000 ppm, and the content of phytosterols is not less than 10,000 ppm.

[0015] Optionally, the rice bran oil does not contain trans fatty acids and glycidyl esters.

[0016] Compared with the prior art, the beneficial effects of this application include: Without altering existing refining production lines, only high-pressure pumps and nanoreactors need to be added. This reduces phosphoric acid usage, increases oil refining yield, reduces diatomaceous earth and clay usage, and saves steam consumption. For oilseeds, the shock waves and microjets generated by nanocavitation can disrupt cell walls, making it easier for oils to dissolve from the cells. Compared to traditional solvent extraction methods, extraction time can be significantly shortened, by 30-50% for some oils, and the amount of organic solvents used is reduced, making it more environmentally friendly. Furthermore, it promotes the separation of impurities, free fatty acids, and other small molecules from the oil matrix under cavitation, reducing quality indicators such as acid value and peroxide value, improving oxidative stability, and resulting in refined oils with lighter color and purer flavor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0018] Figure 1 This is a photograph of the rice bran oil product prepared in Example 1. Detailed Implementation

[0019] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0020] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0021] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0022] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0023] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0024] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0025] To better explain the technical solution provided in this application, the technical solution will be explained in its entirety before the embodiments.

[0026] In existing technologies, oil degumming processes have long faced multiple technical challenges arising from acid degumming. Traditional methods rely on phosphoric acid to break down the structure of non-hydrated phospholipids, but excessive phosphoric acid residue leads to a darker color and deteriorated flavor in the finished oil. Simultaneously, the introduction of heavy metal ion contamination forces subsequent processes to increase the amount of alkali solution used, resulting in the loss of neutral oils through saponification. This vicious cycle not only reduces refining yield but also significantly increases the consumption of washing water and decolorizing adsorbents, creating a dual dilemma of resource waste and rising costs.

[0027] To address the aforementioned issues, the core challenge in existing acid-based degumming technologies lies in balancing reaction efficiency with byproduct formation. By analyzing the bonding characteristics of non-hydrated phospholipids, a strategy of using physical mechanisms to replace chemical fortification is proposed. Studies have confirmed that the shear force generated by high-speed fluids can effectively disrupt the coordination structure of calcium and magnesium ions with phospholipids, but conventional mixing equipment cannot generate sufficient energy density. Further experiments revealed that nanoscale bubbles formed under specific pressure conditions can generate localized high-pressure shock waves, providing a new pathway for the conversion of non-hydrated phospholipids.

[0028] This application provides a method for promoting the chemical refining of rice bran oil using nanocavitation, comprising: Rice bran oil is mixed with phosphoric acid to obtain a mixture, the mixture is subjected to a nano-cavitation reaction, and water is added to obtain a gum. The gum is then separated to obtain impurities and degummed oil. The degummed oil is dried, decolorized, deacidified, and deodorized to obtain rice bran oil.

[0029] By adding phosphoric acid, non-hydrated ions are converted into hydrated ions using a nano-cavitation reaction device. Water is then added to mix the phospholipids, causing them to hydrate and become a gel. The resulting oil and degummed oil are then separated by centrifugation. Specifically, rice bran oil and phosphoric acid form a uniform dispersion system in a mixing device, which is then transported to the nano-cavitation reaction zone. Under pressure, a large number of submicron bubbles are generated inside the mixture. The mechanical energy released when these bubbles collapse causes the non-hydrated phospholipids to transform into a separable form. The resulting gel particles are effectively removed by centrifugation, and the degummed oil undergoes a subsequent refining process to remove residual impurities. This process reduces reliance on chemical reagents through physical enhancement while maintaining phospholipid removal efficiency.

[0030] Compared to existing technologies, traditional acid degumming relies on a high concentration of phosphoric acid for a long reaction time. Therefore, this application's technical solution enhances reaction kinetics through cavitation, significantly reducing the amount of phosphoric acid used. Existing technologies require excessive alkali solution for the soap residue generated during acid-base neutralization; this application reduces the subsequent alkali refining load by minimizing phosphoric acid residue. Conventional processes produce gum particles with a wide particle size distribution; this solution controls the formation of homogeneous colloids through cavitation, significantly improving separation efficiency. This application reduces phosphoric acid usage while maintaining degumming effectiveness, avoiding heavy metal contamination and oil discoloration. The improved gum separation efficiency reduces the consumption of alkali solution and washing water in subsequent processing steps, while also reducing the amount of bleaching clay used. The mechanical energy generated by cavitation replaces some of the chemical energy input, reducing overall process energy consumption. The treated rice bran oil retains more nutrients such as oryzanol, meeting high-quality edible oil standards.

[0031] In one optional embodiment, the rice bran oil contains 11,000-13,000 ppm of oryzanol.

[0032] In one optional embodiment, the concentration of phosphoric acid is 80-90 wt%, and the amount added is 0.05-0.1 wt% of the amount of rice bran oil used.

[0033] Specifically, when rice bran oil is mixed with phosphoric acid, a phosphoric acid concentration of 80-90 wt% effectively decomposes non-hydrated phospholipid structures, while an addition ratio of 4-6 wt% ensures a sufficiently acidic environment to promote gum precipitation while avoiding excessive phosphoric acid leading to the dissolution of metal ions. During the nanocavitation reaction, phosphoric acid and the oil phase form a uniformly dispersed system, accelerating gum aggregation through the cavitation effect. Subsequently, centrifugal separation achieves efficient separation of gum and degummed oil.

[0034] The technical solution of this application greatly reduces the amount of phosphoric acid used, thereby effectively suppressing the risk of heavy metal pollution caused by excessive use of phosphoric acid, reducing the consumption of excessive alkali in the alkali refining stage, and avoiding the problem of oil hydrolysis caused by excessive acidity, so that the degummed oil maintains stable quality in the subsequent drying and decolorization processes.

[0035] In an optional embodiment, the nanocavitation reaction is carried out in a nanoreactor; the nanoreactor (a static device with no moving parts), high-pressure pump, and other equipment can be installed in the existing neutralization process. The process involves mixing the degummed oil with alkali using conventional methods, then pumping it to the nanoreactor for reaction. After heat exchange, the reacted oil enters a desoaping centrifuge for soap removal. The inlet pressure of the nanoreactor is 5.5-6.5 MPa, and the outlet pressure is 3-4 MPa. During oil processing, the tiny bubbles generated by nanocavitation collapse in a very short time. The instant the bubbles collapse, they release enormous energy, creating localized high temperatures (up to 5000°C or higher), high pressures (up to thousands of atmospheres), and strong shock waves and microjets. This energy acts on the oil molecules, breaking down their original structure and promoting a series of physical and chemical changes.

[0036] Optionally, the inlet pressure of the nano-reactive gas can be 5.5 MPa, 5.6 MPa, 5.7 MPa, 5.8 MPa, 5.9 MPa, 6 MPa, 6.1 MPa, 6.2 MPa, 6.3 MPa, 6.4 MPa, or 6.5 MPa, or any value between 5.5 and 6.5 MPa. Optionally, the outlet pressure can be 3 MPa, 3.1 MPa, 3.2 MPa, 3.3 MPa, 3.4 MPa, 3.5 MPa, 3.6 MPa, 3.7 MPa, 3.8 MPa, 3.9 MPa, or 4 MPa, or any value between 3 and 4 MPa.

[0037] In one optional embodiment, the temperature of the nanocavitation reaction is 50-70°C and the reaction time is 5-20 min.

[0038] Optionally, the temperature of the nanocavitation reaction can be 50℃, 51℃, 52℃, 53℃, 54℃, 55℃, 56℃, 57℃, 58℃, 59℃, 60℃, 61℃, 62℃, 63℃, 64℃, 65℃, 66℃, 67℃, 68℃, 69℃, or 70℃, or any value between 50℃ and 70℃. Optionally, the time of the nanocavitation reaction can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, or 20 min, or any value between 5 min and 20 min.

[0039] Specifically, the mixture is pressurized within the nanoreactor to a turbulent environment created by the pressure difference between the inlet and outlet, while the temperature is controlled within the range of 50-70°C. This causes the bonds between non-hydrated phospholipids and calcium and magnesium ions in the oil to break under the action of cavitation shock waves, while maintaining the stability of oryzanol and cholesterol. The reaction time is set to 5-20 minutes, and through the dynamic balance of continuous feeding and discharging, the mixture completes phospholipid conversion and colloidal aggregation within the reactor, subsequently entering the separation stage.

[0040] The technical solution of this application can complete the removal of non-hydrated phospholipids in a short time, control the reaction temperature below the critical value to avoid the decomposition of oryzanol, and retain no less than 10,000 ppm of oryzanol and cholesterol in the degummed oil, ensuring that the nutrients are not lost during the refining process, and without the need to add additional antioxidants or extend the processing time of subsequent refining processes.

[0041] In one alternative implementation, the power consumption per ton of rice bran oil is 2.5-4 kW.

[0042] Optionally, the power consumption per ton of the rice bran oil can be 2.5 kW, 2.6 kW, 2.7 kW, 2.8 kW, 2.9 kW, 3 kW, 3.1 kW, 3.2 kW, 3.3 kW, 3.4 kW, 3.5 kW, 3.6 kW, 3.7 kW, 3.8 kW, 3.9 kW, or 4 kW, or any value between 2.58 and 4 kW.

[0043] Specifically, by optimizing the power output of the high-pressure pump to match the amount of the mixture, the turbulence intensity required for the nanocavitation reaction to destroy the non-hydrated phospholipid structure is ensured, while avoiding energy waste caused by excessive pressure or reaction time.

[0044] Compared with existing technologies, traditional acid degumming processes require additional energy consumption for neutralizing excess phosphoric acid and treating wastewater. However, nano-cavitation technology, by precisely controlling reaction conditions, limits unit energy consumption to a low level, while reducing energy requirements for subsequent alkali refining and water washing steps, thereby improving the controllability of the degumming process.

[0045] In one optional embodiment, during the nanocavitation reaction, microbubbles are formed inside the mixture, the microbubbles having a diameter of 10-1000 nm.

[0046] Optionally, the diameter of the microbubbles generated during the nanocavitation reaction can be 10 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1000 nm, or any value between 10 and 1000 nm.

[0047] Specifically, after the rice bran oil and phosphoric acid mixture enters the nanoreactor, the high-pressure environment causes the fluid to form high-speed turbulence. The sudden pressure drop causes dissolved gases to precipitate and form bubbles with diameters ranging from 10 to 1000 nm. These bubbles rapidly collapse during the subsequent pressure recovery phase, generating a localized high-temperature and high-pressure environment. The shock waves from this environment can break the bonds between non-hydrated phospholipids and calcium and magnesium ions, transforming the previously difficult-to-remove gums into a separable state. At the same time, the microjets generated during bubble collapse enhance the mass transfer efficiency of the mixture, promoting full contact between phosphoric acid and the gums and reducing the probability of free metal ions remaining in the degumming oil.

[0048] In one optional embodiment, the rice bran oil contains not less than 10,000 ppm of oryzanol and not less than 10,000 ppm of phytosterols.

[0049] In an alternative embodiment, the rice bran oil does not contain trans fatty acids and glycidyl esters.

[0050] Specifically, in the nanocavitation reaction process, the pressure gradient and hydrodynamic conditions within the reactor are precisely controlled to ensure degumming of the mixture at non-extreme temperatures. The deacidification stage employs a stepwise neutralization process to avoid the formation of localized strong alkaline environments. This effectively removes both gums and free fatty acids throughout the entire refining process while preventing the formation of trans double bonds and transesterification side reactions. It is understandable that traditional chemical refining processes using excessive phosphoric acid in the acid degumming stage can lead to a drop in oryzanol content below 8000 ppm, and the high-temperature treatment in the deodorization process can easily cause a cholesterol loss of over 30%. However, with nanocavitation technology, the reaction time is shortened to one-third of that of traditional processes, reducing the damage to heat-sensitive components while maintaining an oryzanol retention rate of over 95% and a cholesterol retention rate of over 85%. This method achieves the simultaneous retention of functional nutrients during the refining process of rice bran oil. The resulting rice bran oil not only meets the degumming rate requirements but also possesses the quality characteristics of oryzanol content ≥10000ppm and cholesterol content ≥10000ppm, providing a feasible production method for developing high value-added functional edible oils.

[0051] The rice bran oil product is obtained by drying, decolorizing, degassing, deacidifying, and deodorizing the degummed oil. The specific steps are as follows: The degumming oil was dried in a vacuum environment at 100°C. Increase the temperature to 110℃ and decolorize the dried degummed oil for 20 minutes; After the air is expelled from the decolorized oil, it is heated to 200°C under absolute pressure to remove acidity and odor, thus obtaining rice bran oil product.

[0052] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0053] Example 1 This embodiment provides a method for promoting the chemical refining of rice bran oil through nanocavitation, and the specific steps are as follows: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0054] 0.75 kg of 85 wt% phosphoric acid was added to 1 ton of rice bran oil to obtain a mixture. The inlet pressure of the nanoreactor was set to 6 MPa and the outlet pressure to 3.5 MPa. The mixture was subjected to a nanocavitation reaction at a temperature of 60℃ for 13 minutes. The power consumption of the nanoreactor was 3 kW. Non-hydrated ions were converted into hydrated ions using the nanocavitation reaction device. Water was added to mix the phospholipids, causing them to hydrate and become a gel. Impurities and degummed oil were separated by centrifugation.

[0055] After drying, decolorizing, degassing, deacidifying, and deodorizing using the above method, rice bran oil products are obtained, such as... Figure 1 As shown in Table 1, the content of key components is as follows: Table 1. Content of key components in the obtained rice bran oil product.

[0056] Example 2 This embodiment provides a method for promoting the chemical refining of rice bran oil through nanocavitation, and the specific steps are as follows: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0057] 0.5 kg of 85 wt% phosphoric acid was added to 1 ton of rice bran oil to obtain a mixture. The inlet pressure of the nanoreactor was set to 5.5 MPa and the outlet pressure to 3 MPa. The mixture was subjected to a nanocavitation reaction at a reaction temperature of 50℃ for 5 minutes. The power consumption of the nanoreactor was 2.6 kW. The non-hydrated ions were converted into hydrated ions through the nanocavitation reaction device. Water was added to mix the phospholipids, causing them to hydrate and become a gel. Impurities and degummed oil were separated by centrifugation.

[0058] The rice bran oil product is obtained by drying, decolorizing, degassing, deacidifying and deodorizing using the above method.

[0059] The contents of the key components are shown in Table 2 below: Table 2 shows the content of key components in the obtained rice bran oil product.

[0060] Example 3 This embodiment provides a method for promoting the chemical refining of rice bran oil through nanocavitation, and the specific steps are as follows: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0061] 1 kg of 85 wt% phosphoric acid was added to 1 ton of rice bran oil to obtain a mixture. The inlet pressure of the nanoreactor was set to 6.5 MPa and the outlet pressure to 3.8 MPa. The mixture was subjected to a nanocavitation reaction at a temperature of 70°C for 20 minutes. The power consumption of the nanoreactor was 4 kW. Non-hydrated ions were converted into hydrated ions using the nanocavitation reaction device. Water was added to mix the phospholipids, causing them to hydrate and become a gel. Impurities and degummed oil were separated by centrifugation.

[0062] The rice bran oil product is obtained by drying, decolorizing, degassing, deacidifying and deodorizing using the above method.

[0063] The contents of the key components are shown in Table 3 below: Table 3 shows the content of key components in the obtained rice bran oil product.

[0064] Comparative Example 1 This comparative example provides a traditional method for the chemical refining of rice bran oil, with the following specific steps: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0065] Add 2 kg of 85 wt% phosphoric acid to 1 t of rice bran oil to obtain a mixture. After separating the gum from the mixture, degummed oil is obtained.

[0066] Add 300 kg of NaOH solution to the degummed oil to neutralize the FFA and generate soap residue, then centrifuge to separate the residue.

[0067] After drying, decolorizing, degassing, and deodorizing using the above method, rice bran oil product is obtained.

[0068] The contents of the key components are shown in Table 4 below: Table 4. Content of key components in rice bran oil products prepared by conventional methods.

[0069] Comparative Example 2 This comparative example provides a method for the chemical refining of rice bran oil, the specific steps of which are as follows: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0070] Add 0.75 kg of phosphoric acid to 1 t of rice bran oil to obtain a mixture, and sonicate at 60 °C for 5 min at a frequency of 40 kHz.

[0071] The rice bran oil product is obtained by drying, decolorizing, degassing, deacidifying and deodorizing using the above method.

[0072] Comparative Example 3 This comparative example provides a method for the chemical refining of rice bran oil, the specific steps of which are as follows: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0073] 0.75 kg of phosphoric acid was added to 1 ton of rice bran oil to obtain a mixture. The inlet pressure of the nanoreactor was set to 10 MPa and the outlet pressure to 5 MPa. The mixture was subjected to a nanocavitation reaction at a reaction temperature of 60℃ for 13 minutes. The power consumption of the nanoreactor was 3 kW. Non-hydrated ions were converted into hydrated ions using the nanocavitation reaction device. Water was added to mix the phospholipids, causing them to hydrate and become a gel. Impurities and degummed oil were separated by centrifugation.

[0074] The rice bran oil product is obtained by drying, decolorizing, degassing, deacidifying and deodorizing using the above method.

[0075] Comparative Example 4 This comparative example provides a method for the chemical refining of rice bran oil, the specific steps of which are as follows: Rice bran oil with an acid value of about 30, a oryzanol content of about 12,000 ppm, and zero trans fatty acids and glycidyl esters is used as raw material.

[0076] 0.75 kg of phosphoric acid was added to 1 ton of rice bran oil to obtain a mixture. The inlet pressure of the nanoreactor was set to 4 MPa and the outlet pressure to 2 MPa. The mixture was subjected to a nanocavitation reaction at a temperature of 60°C for 13 minutes. The power consumption of the nanoreactor was 3 kW. Non-hydrated ions were converted into hydrated ions using the nanocavitation reaction device. Water was added to mix the phospholipids, causing them to hydrate and become a gel. Impurities and degummed oil were separated by centrifugation.

[0077] The rice bran oil product is obtained after drying, decolorizing, degassing, deacidifying, and deodorizing using the above method. Information from the above examples and comparative examples is shown in Table 5. Table 5. Information on the rice bran oil obtained in the examples and comparative examples.

[0078] As can be seen from Tables 1-5: The rice bran oil product prepared by the technical solution provided in this application showed no detectable levels of glycidyl esters, trans fatty acids, and trichloropropane, and minimal loss of oryzanol and phytosterols. This demonstrates that the "trace amounts of phosphoric acid + physical cavitation" method in this application replaces a large amount of acid-base chemical methods. This not only increases the refining rate by 1.5 percentage points but also completely eliminates the formation of trans fatty acids and glycidyl esters, while simultaneously increasing the retention of oryzanol by nearly 2800 ppm, demonstrating significant advantages.

[0079] Compared to conventional chemical refining methods (Comparative Example 1) and ultrasonic-assisted methods (Comparative Example 2), the embodiments of the present invention significantly improve the refining rate (≥97.9%) while maintaining the content of oryzanol and phytosterols in the finished product at over 10,000 ppm (retention rate >85%), and trans fatty acids, glycidyl esters, and trichloropropanol are not detected (below the detection limit). Of particular note is that when the nanocavitation pressure deviates from the range defined in this application (e.g., the pressure in Comparative Example 3 is too high, and the pressure in Comparative Example 4 is too low), even with the same nanoreactor, the refining rate is even lower than that of conventional methods. This indicates that the technical effect of this application depends entirely on the strict selection of the specific pressure parameters, exhibiting unpredictable advantages.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0081] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for promoting the chemical refining of rice bran oil through nanocavitation, characterized in that, include: Rice bran oil is mixed with phosphoric acid to obtain a mixture, the mixture is subjected to a nano-cavitation reaction, and water is added to obtain a gum. The gum is then separated to obtain impurities and degummed oil. The degummed oil is dried, decolorized, deacidified, and deodorized to obtain rice bran oil.

2. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 1, characterized in that, The rice bran oil contains 11,000-13,000 ppm of oryzanol.

3. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 1, characterized in that, The concentration of phosphoric acid is 80-90 wt%, and the amount added is 0.05-0.1 wt% of the amount of rice bran oil used.

4. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 1, characterized in that, The nanocavitation reaction is carried out in a nanoreactor.

5. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 4, characterized in that, The inlet pressure of the nanoreactor is 5.5-6.5 MPa, and the outlet pressure is 3-4 MPa.

6. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 4, characterized in that, The temperature of the nanocavitation reaction is 50-70℃, and the reaction time is 5-20 min.

7. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 4, characterized in that... The power consumption per ton of the rice bran oil is 2.5-4 kW.

8. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 1, characterized in that, During the nanocavitation reaction, microbubbles are formed inside the mixture, and the diameter of the microbubbles is 10-1000 nm.

9. The method for promoting the chemical refining of rice bran oil by nanocavitation according to claim 1, characterized in that, The rice bran oil contains at least 10,000 ppm of oryzanol and at least 10,000 ppm of phytosterols.

10. The method for promoting the chemical refining of rice bran oil by nanocavitation according to any one of claims 1-9, characterized in that, The rice bran oil does not contain trans fatty acids or glycidyl esters.

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