Frying oil work-up method

Abstract

A frying oil work-up method, comprising: providing frying oil; measuring the acid value of the frying oil and / or the content of polar components of the frying oil; and on the basis of the acid value and / or the content of polar components, providing an adsorbent having a matching weight and a corresponding proportion for work-up, so as to obtain standard-compliant frying oil, wherein the acid value of the standard-compliant frying oil is ≤0.5 mg / g, and the content of polar components of same is ≤2 wt%. The adsorbent consists of magnesium oxide and silicon dioxide.

Description

Treatment method of frying oil

[0001] The present application claims priority to the Chinese patent application No. 202411387020.9, filed on September 29, 2024, and entitled "Treatment method of frying oil", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of frying oil treatment, in particular to a treatment method of frying oil. BACKGROUND

[0003] During the frying process, the frying oil reacts with water and oxygen in the food under high temperature, and generates free fatty acids, oxidized triglycerides, oxidized glyceride polymers and other substances through hydrolysis, oxidation and polymerization. These substances are collectively referred to as polar components. Different frying oils have different acid values and polar component contents after frying. The presence of polar components can cause the frying life of frying oil to decrease rapidly. In the national food safety standard GB 2716-2018, when the polar component content of frying oil is greater than or equal to 27wt% and the acid value is higher than 5mg / g, the frying oil needs to be discarded and cannot be used as frying oil again. Therefore, during the preparation of fried food, the frying oil in use needs to be treated in time to remove the polar components to prolong its frying life.

[0004] Currently, the frying oil is generally treated by filter paper filtration and filter oil powder (main component is magnesium silicate) adsorption. Among them, the filter oil powder adsorption method is a relatively mature method, that is, the frying oil in use is mixed with the filter oil powder for a certain time and then filtered to obtain frying oil with reduced acid value and polar component content. However, different frying oils have different acid values and polar component contents after frying. When the acid value is high, the free fatty acids can be reduced by reacting with magnesium oxide, and the generated fatty acid magnesium can be adsorbed on the silicon dioxide. When the polar component content is high, the polar components can be removed by adsorption of silicon dioxide. The traditional filter oil powder adsorption does not consider the change of acid value and / or polar component content, and generally uses a fixed amount of addition. The amount of addition is much larger than the actual reaction requirement, and a large amount of oil is adsorbed by the adsorbent, resulting in large oil loss and high cost.

[0005] Moreover, the equipment used in the prior art mainly includes a mixing tank and a filter. These devices do not monitor the acid value and peroxide value / polar component indicators of the frying oil in use in real time, and have the disadvantages of long frying oil treatment time, large amount of filter oil powder addition, large frying oil loss and high processing cost. SUMMARY

[0006] In order to solve the above technical problems, the application provides a frying oil processing method, which overcomes the defects of long frying oil processing time, large filter powder addition amount, much frying oil loss and high processing cost of the prior frying oil processing method.

[0007] To solve the above problems, the application provides a frying oil processing method, which comprises the following steps:

[0008] providing frying oil;

[0009] detecting the acid value and / or the content of polar components of the frying oil;

[0010] processing the frying oil by using adsorbents with matching weight and corresponding proportion according to the acid value and / or the content of polar components of the frying oil, so as to obtain qualified frying oil, wherein the acid value of the qualified frying oil is less than or equal to 0.5 mg / g, and the content of polar components of the qualified frying oil is less than or equal to 2 wt%.

[0011] Optionally, the adsorbents are composed of magnesium oxide and silicon dioxide.

[0012] Optionally, the processing of the frying oil by using adsorbents with matching weight and corresponding proportion according to the acid value and / or the content of polar components of the frying oil comprises the following steps:

[0013] when the acid value of the frying oil is greater than 0.5 mg / g and less than or equal to 3 mg / g and / or the content of polar components is less than or equal to 10 wt%, providing magnesium oxide and silicon dioxide adsorbents with a mass ratio of 1-2:1 to adsorb and process the frying oil; when the acid value of the frying oil is greater than 3 mg / g and less than or equal to 5 mg / g and / or the content of polar components is greater than 10 wt%, providing magnesium oxide and silicon dioxide adsorbents with a mass ratio of 2-3:1 to adsorb and process the frying oil.

[0014] The amount of the adsorbents is 1 wt%-5 wt% of the weight of the frying oil.

[0015] Optionally, the frying oil is processed by a frying oil processing device, and the frying oil processing device comprises a mixing tank, a motor and a vacuum pump.

[0016] The mixing tank is suitable for providing a containing cavity for accommodating the frying oil and the adsorbents, and a stirring paddle is arranged in the mixing tank.

[0017] The motor is connected with the stirring paddle.

[0018] The vacuum pump is connected with the mixing tank.

[0019] Optionally, the treatment temperature of the frying oil when being treated by the adsorption treatment device is 150-190°C, the treatment time is 20-40 minutes, and the vacuum degree is 0.1-0.5 MPa.

[0020] Optionally, the frying oil treatment device further comprises:

[0021] An adsorbent assembly is connected to the mixing tank and is adapted to provide the adsorbent.

[0022] Optionally, the adsorbent assembly comprises a plurality of adsorbent dosing tanks, and a weighing module and a switch module at the end of each adsorbent dosing tank.

[0023] Optionally, the number of adsorbent dosing tanks is 2.

[0024] Optionally, the acid value of the frying oil is detected by an acid value detector, and the content of the polar component of the frying oil is detected by a polar component detector, and the acid value detector and the polar component detector are respectively arranged on the mixing tank.

[0025] Optionally, the frying oil treatment device further comprises a control assembly, the weighing module is connected to the control assembly, and is adapted to weigh the adsorbent with a matching weight and a corresponding ratio of the acid value and / or the polar component under the control of the control assembly; and the switch module is connected to the control assembly, and is adapted to open or close the adsorbent dosing tank under the control of the control assembly.

[0026] Optionally, after the frying oil is treated by adsorption, the frying oil is filtered to obtain the qualified frying in-use oil, and after the qualified frying in-use oil is obtained, the next batch of frying oil is treated.

[0027] Optionally, the treatment of the frying oil according to the content of the acid value and / or the polar component of the frying oil to provide the adsorbent with a matching weight and a corresponding ratio comprises:

[0028] When the acid value detector detects that the acid value of the frying oil is 0.5mg / g < acid value ≤ 3mg / g and / or the polar component detector detects that the content of the polar component of the frying oil is ≤10wt%, the control assembly sends a control instruction to make each of the weighing modules weigh a certain amount of magnesium oxide and silicon dioxide adsorbents, so that the weight ratio of magnesium oxide to silicon dioxide is 1-2:1, and the amount of the adsorbents is 1wt-5wt% of the weight of the frying oil, and the control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbents into the mixing tank; when the acid value detector detects that the acid value of the frying oil is 3mg / g < acid value ≤ 5mg / g and / or the polar component detector detects that the content of the polar component of the frying oil is >10wt%, the control assembly sends a control instruction to make each of the weighing modules weigh a certain amount of magnesium oxide and silicon dioxide adsorbents, so that the weight ratio of magnesium oxide to silicon dioxide is 2-3:1, and the amount of the adsorbents is 1wt%-5wt% of the weight of the frying oil, and the control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbents into the mixing tank.

[0029] Compared with the prior art, the technical scheme of the embodiment of the present application has the following advantages:

[0030] According to the acid value and / or the content of the polar component of the frying oil, the scheme of the present application provides the adsorbents with matching weight and corresponding ratio to treat the frying oil, adjusts the proportion of magnesium oxide and silicon dioxide in the oil filtering powder in real time, realizes the efficient combination of removing free fatty acids by magnesium oxide and removing polar components by silicon dioxide, removes the pigment generated by the frying oil due to heating through the adsorption of silicon dioxide, reduces the color of the frying oil from brown to yellow, and reduces the acid value and the polar component by more than 60%. The scheme can realize precise addition of the adsorbents, thereby saving the amount of the adsorbents, avoiding large loss of oil, and reducing the color of the frying oil. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 is a flow chart of the treatment method of the frying oil in the embodiment of the present application;

[0032] Fig. 2 is a structural schematic view of the frying oil treatment equipment in the embodiment of the present application.

[0033] Wherein, 10 - frying oil treatment equipment; 100 - mixing tank; 101 - stirring blade; 200 - motor; 300 - vacuum pump; 400 - adsorbent assembly; 401 - first adsorbent quantitative tank; 4011 - first weighing module; 4012 - first switch module; 402 - second adsorbent quantitative tank, 4021 - second weighing module; 4022 - second switch module; 500 - control assembly; 600 - filter; 700 - oil storage tank; 800 - oil pump; 901 - acid value detector; 902 - polar component detector. DETAILED DESCRIPTION

[0034] As described in the background, food generates polar components during frying, the presence of polar components leads to rapid decline of frying oil frying life, and according to the provisions of the national food safety standard GB 2716-2018, when the polar component content of frying in-use oil is greater than or equal to 27wt%, and the acid value is higher than 5mg / g, the frying in-use oil needs to be discarded and cannot be used as frying oil. Therefore, during the preparation of fried food, the frying in-use oil needs to be treated in time to remove the polar components to prolong its frying life.

[0035] The inventor found through research that the existing edible oil filtration system usually includes a mixing tank and a filter. When filtering the frying in-use oil, the filter aid and the frying in-use oil are usually placed in the mixing tank, and after mixing for a set period of time (such as one hour), the mixture of the filter aid and the frying in-use oil is taken as a sample for detection. After detection, the mixture of the filter aid and the frying in-use oil is filtered. If the detection is not qualified, the filter aid is added to the mixing tank, and then the sample is detected again after re-mixing for a set period of time until the detection is qualified. That is, the filter aid adsorption method used in the prior art to treat frying oil generally uses quantitative addition, which does not consider the changes in acid value and / or polar component content, and the addition amount is much larger than the actual reaction requirement, so that the adsorbent adsorbs a large amount of oil, resulting in large oil loss and high cost.

[0036] In order to solve the above technical problems, by providing an adsorbent with a matching weight and a corresponding ratio according to the acid value and / or the content of polar components of the frying oil to treat the frying oil, the ratio of magnesium oxide and silicon dioxide in the filter aid is adjusted in real time to realize the efficient combination of magnesium oxide removing free fatty acids and silicon dioxide removing polar components. At the same time, through the adsorption of silicon dioxide, the color of the brown frying oil generated due to heating is reduced to yellow, and the acid value and the polar component are reduced by more than 60%. Precise addition of adsorbent can be realized, thereby saving the amount of adsorbent and avoiding large oil loss, and at the same time, the color of the frying in-use oil can be reduced.

[0037] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the present application will be described in detail below with reference to the drawings and specific embodiments.

[0038] The raw materials, samples, reagents and equipment used in the frying oil treatment method in the embodiments of the present application are all commercially available and can be purchased in the market.

[0039] Referring to FIG. 1, which is a flow chart of the frying oil treatment method in the embodiments of the present application. The frying oil treatment method comprises the following steps.

[0040] S100, providing frying oil.

[0041] It should be noted that the frying oil is edible oil in the process of food frying, and its types include but are not limited to palm oil, soybean oil, rapeseed oil, etc.

[0042] S200, detecting the acid value and / or the content of polar components of the frying oil.

[0043] It should be noted that in specific applications, the acid value detection method in the prior art can be selected to detect the acid value of the frying oil, such as using a near-infrared analyzer for detection. In addition, the content detection method of polar components in the prior art can be selected to detect the content of polar components of the frying oil, such as using an edible oil quality detector for detection.

[0044] S300, providing a matching weight and a corresponding ratio of adsorbent according to the acid value and / or the content of polar components of the frying oil to treat the frying oil, so as to obtain qualified frying-in-use oil, wherein the acid value of the qualified frying-in-use oil is ≤0.5mg / g, and the content of polar components of the qualified frying-in-use oil is ≤2wt%.

[0045] In some embodiments, the adsorbent consists of magnesium oxide and silicon dioxide.

[0046] In some embodiments, the treatment of the frying oil according to the acid value and / or the content of polar components of the frying oil includes:

[0047] When the acid value of the frying oil is 0.5mg / g

[0048] The amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil.

[0049] It should be noted that the 0.5mg / g≤acid value≤3mg / g and / or the content of the polar component≤10wt% includes three cases that 0.5mg / g≤acid value≤3mg / g is satisfied alone, the content of the polar component≤10wt% is satisfied alone, 0.5mg / g≤acid value≤3mg / g and the content of the polar component≤10wt% are both satisfied; similarly, 3mg / g≤acid value≤5mg / g and / or the content of the polar component>10wt% includes three cases that 3mg / g≤acid value≤5mg / g is satisfied alone, the content of the polar component>10wt% is satisfied alone, 3mg / g≤acid value≤5mg / g and the content of the polar component>10wt% are both satisfied.

[0050] Please refer to FIG. 2, which is a structural schematic diagram of the frying oil treatment equipment in the embodiment of the present application. In some embodiments, the frying oil is subjected to adsorption treatment by the frying oil treatment equipment 10, which comprises a mixing tank 100, a motor 200 and a vacuum pump 300; the mixing tank 100 is adapted to provide a containing cavity for containing the frying oil and the adsorbent, and the mixing tank 100 is provided with a stirring paddle 101; the motor 200 is connected with the stirring paddle 101; and the vacuum pump 300 is connected with the mixing tank 100. The motor 200 can drive the stirring paddle 101 to rotate, thereby realizing the mixing operation of the frying oil and the adsorbent, so that the adsorbent can adsorb the polar component in the frying oil.

[0051] In some embodiments, when the frying oil is subjected to adsorption treatment by the frying oil treatment equipment 10, the treatment temperature is 150℃-190℃, the treatment time is 20min-40min, and the vacuum degree is 0.1MPa-0.5MPa.

[0052] Please continue to refer to FIG. 2. In some embodiments, the frying oil treatment equipment 10 further comprises:

[0053] An adsorbent assembly 400 is linked with the mixing tank 100 and is adapted to provide the adsorbent.

[0054] Please continue to refer to FIG. 2. In some embodiments, the adsorbent assembly 400 comprises a plurality of adsorbent dosing tanks, and a weighing module and a switch module are located at the end of each adsorbent dosing tank.

[0055] Please continue to refer to Figure 2, in some embodiments, the number of the adsorbent dosing tanks is 2. Specifically, the adsorbent assembly 400 includes a first adsorbent dosing tank 401 and a second adsorbent dosing tank 402, the first adsorbent dosing tank 401 is provided with a first weighing module 4011 and a first switch module 4012 at the end, and the second adsorbent dosing tank 402 is provided with a second weighing module 4021 and a second switch module 4022 at the end. In specific use, the first component (for example, magnesium oxide) in the adsorbent can be placed in the first adsorbent dosing tank, and the second component (for example, silicon dioxide) in the adsorbent can be placed in the second adsorbent dosing tank, so as to facilitate subsequent quantitative weighing operation.

[0056] Further, in order to realize real-time detection of the acid value and / or the content of the polar component of the frying oil, in an embodiment, the acid value of the frying oil can be detected by an acid value detector, and the content of the polar component of the frying oil can be detected by a polar component detector.

[0057] Please continue to refer to Figure 2, in an embodiment, the acid value of the frying oil is detected by an acid value detector 901, and the content of the polar component of the frying oil is detected by a polar component detector 902, the acid value detector 901 and the polar component detector 902 are respectively arranged on the mixing tank 100. Optionally, the acid value detector 901 includes a first probe, a light source, an optical fiber sensor, a diffraction grating, a diode detection array and a plurality of photodiodes; the light source irradiates white light to the surface of the mixture of the frying oil and the adsorbent through the first probe; after the white light is reflected by the mixture of the frying oil and the adsorbent, the reflected light reaches the diffraction grating through the optical fiber sensor, and then is transmitted to the diode detection array after being diffracted by the diffraction grating, the signal obtained by the diode detection array is irradiated to the photodiode, the acid value detector obtains the signal sent by the photodiode, and the acid value detection result is obtained. Optionally, the polar component detector 902 includes an electromagnetic wave generating structure and a dielectric constant detection structure, the dielectric constant value of the frying oil is detected, and the polar component detection result is obtained based on the dielectric constant value.

[0058] By using the acid value detector 901 and the polar component detector 902, the detection of the acid value and the content of the polar component can be realized without separately taking out the frying oil sample, the filtration time increased due to taking out the sample is avoided, and the filtration time is further shortened. In addition, the loss of the frying oil due to separately taking out part of the sample can also be avoided, so that the filtration cost can be reduced.

[0059] Please continue to refer to FIG. 2, in some embodiments, the frying oil processing device 10 further comprises a control assembly 500, the weighing module (for example, the first weighing module 4011, the second weighing module 4021) is connected with the control assembly 500, and is adapted to weigh the adsorbent matched with the acid value and / or the corresponding proportion of the polar component under the control of the control assembly 500; the switch module (for example, the first switch module 4012, the second switch module 4022) is connected with the control assembly 500, and is adapted to open or close the adsorbent quantitative tank (for example, the first adsorbent quantitative tank 401, the second adsorbent quantitative tank 402) under the control of the control assembly 500. In addition, the acid value detector 901 and the polar component detector 902 are also connected with the control assembly 500 respectively, and the detection signals of the acid value detector and the polar component detector are obtained in time, and instructions are sent to the weighing module (for example, the first weighing module 4011, the second weighing module 4021) and the switch module (for example, the first switch module 4012, the second switch module 4022) based on the detection results of the acid value and the polar component.

[0060] It needs to be further explained that the control assembly 500 can control the addition of the adsorbent based on the current oil quality detection result of the frying oil, instead of adding the adsorbent in a fixed amount each time. Specifically, in the initial state, the control assembly 500 performs initial detection on the frying oil to obtain an initial oil quality detection result, at this time, the control assembly 500 can control the weighing module (for example, the first weighing module 4011, the second weighing module 4021) to weigh the adsorbent matched with the initial oil quality detection result. After the frying oil and the adsorbent are mixed for a certain time, an intermediate oil quality detection result can be obtained again, if the intermediate oil quality detection result is still greater than or equal to the preset oil quality detection target, the control assembly 500 can control the weighing module (for example, the first weighing module 4011, the second weighing module 4021) to weigh the adsorbent matched with the intermediate oil quality detection result, without adding the adsorbent matched with the initial oil quality detection result, so as to reduce the addition amount of the adsorbent and further reduce the filtration cost.

[0061] In some embodiments, after the frying oil treated by adsorption is filtered, the qualified frying in-use oil can be obtained, after the qualified frying in-use oil is obtained, the next batch of frying oil can be processed. It needs to be explained that the frying oil treated by adsorption is filtered because the adsorbent used for adsorption treatment is distributed in the frying oil, and therefore needs to be filtered and removed. In industrial application, a filter can be used to filter the frying oil treated by adsorption.

[0062] Please continue to refer to Figure 2, in an embodiment, the frying oil processing device 10 further comprises a filter 600 and an oil storage tank 700, one end of the filter 600 is connected with the mixing tank 100 through an oil pump 800, the other end of the filter 600 is connected with the oil storage tank 700. A filter screen is arranged in the filter 600. The frying oil after adsorption treatment enters the filter 600 through the oil pump 800, and is filtered by the filter screen, so that the adsorbent in the oil can be removed, thereby obtaining frying oil without or with very low content of adsorbent.

[0063] In some embodiments, the frying oil is treated by the adsorbent with matching weight and corresponding ratio according to the acid value and / or the content of the polar component of the frying oil, which comprises:

[0064] The frying oil is placed in the mixing tank, when the acid value detector detects that the acid value of the frying oil is 0.5mg / g < acid value≤3mg / g and / or the polar component detector detects that the content of the polar component is≤10wt%, the control assembly issues a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbent respectively, so that the weight ratio of magnesium oxide to silicon dioxide is 1-2:1, and the amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil, and the control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank; when the acid value detector detects that the acid value of the frying oil is 3mg / g < acid value≤5mg / g and / or the polar component detector detects that the content of the polar component is >10wt%, the control assembly issues a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbent respectively, so that the weight ratio of magnesium oxide to silicon dioxide is 2-3:1, and the amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil, and the control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank.

[0065] Specifically, in the industrial application scenario, the processing method of the frying oil is:

[0066] The frying oil is transported into the mixing tank 100, the acid value of the frying oil is detected in real time by the acid value detector 901, the content of the polar component of the frying oil is detected in real time by the polar component detector 902, the detection signals are transported to the control assembly 500, and the adsorbent with a weight matched with the acid value and / or the content of the polar component and a corresponding matching ratio is weighed by the adsorbent quantitative tank (for example, the first adsorbent quantitative tank 401 and the second adsorbent quantitative tank 402) according to the two index values. The amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil. Specifically, when the acid value of the frying oil is 0.5mg / g The frying oil is transported into the mixing tank 100, the acid value of the frying oil is detected in real time by the acid value detector 901, the content of the polar component of the frying oil is detected in real time by the polar component detector 902, the detection signals are transported to the control assembly 500, and the adsorbent with a weight matched with the acid value and / or the content of the polar component and a corresponding matching ratio is weighed by the adsorbent quantitative tank (for example, the first adsorbent quantitative tank 401 and the second adsorbent quantitative tank 402) according to the two index values. The amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil. Specifically, when the acid value of the frying oil is 0.5mg / g The frying oil is transported into the mixing tank 100, the acid value of the frying oil is detected in real time by the acid value detector 901, the content of the polar component of the frying oil is detected in real time by the polar component detector 902, the detection signals are transported to the control assembly 500, and the adsorbent with a weight matched with the acid value and / or the content of the polar component and a corresponding matching ratio is weighed by the adsorbent quantitative tank (for example, the first adsorbent quantitative tank 401 and the second adsorbent quantitative tank 402) according to the two index values. The amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil. Specifically, when the acid value of the frying oil is 0.5mg / gWhen the filter 600 pressure is higher than 6 mPa, open the compressed air to squeeze the filter 600 residual oil to the oil tank 700, then open the filter automatic valve, discharge the residual adsorbent, then close the automatic valve, and then perform the next batch of operations.

[0067] In addition, the application also provides a qualified frying in-use oil, which is obtained by the treatment method of the frying oil according to the application. The qualified frying in-use oil prepared by the application has an acid value of ≤0.5 mg / g and a polar component content of ≤2 wt%, which meets the requirements of the national food safety standard GB 2716-2018, and can continue to be used, thereby prolonging the frying life.

[0068] The advantages of the treatment method of the frying oil according to the application are illustrated by the first embodiment, the second embodiment and the comparative example. The first embodiment and the second embodiment are both implemented by using the frying oil treatment equipment 10 described above, and the comparative example is implemented by using the frying oil treatment equipment of the prior art without real-time detection of acid value and polar component.

[0069] First embodiment

[0070] The frying oil is transported into the mixing tank, the polar component content is detected by the polar component detector, the acid value is detected by the acid value detector, and the detection signal is sent to the control assembly. When the acid value of the frying oil is 3 mg / g and the content of the polar component is 7 wt%, the amount of the adsorbent is 2 wt% of the weight of the frying oil. The control assembly sends a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbent, and the weight ratio of magnesium oxide to silicon dioxide is 1:1. The control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank, and at the same time, the motor and the vacuum pump are started to perform adsorption. The treatment temperature is 160℃, the time is 30 min, and the vacuum degree is 0.1 MPa. The acid value detector and the polar component detector detect the acid value and the polar component content in real time. When both indicators are less than the set value (acid value 0.5 mg / g, polar component 2 wt%), the motor and the vacuum pump are turned off, the oil pump is turned on, and the oil is transported to the filter for continuous filtration. The filtered oil enters the oil tank. The trapped adsorbent remains in the filter, and then the next batch of operations is performed. When the filter pressure is higher than 6 mPa, open the compressed air to squeeze the filter residual oil to the oil tank, then open the filter automatic valve, discharge the residual adsorbent, then close the automatic valve, and then perform the next batch of operations. Under the operation conditions, the acid value of the adsorbed and filtered frying oil is 0.4 mg / g, the polar component content is 1.6 wt%, and the oil loss is 0.6 wt%.

[0071] Second embodiment

[0072] The frying oil is transported into the mixing tank, and the content of the polar component is detected by the polar component detector, and the acid value is detected by the acid value detector, and the detection signal is sent to the adsorbent quantitative tank control unit. When the acid value of the frying oil is 5 mg / g and / or the content of the polar component is 12 wt%, the adsorbent is quantitatively weighed according to the two index values. The amount of adsorbent is 5 wt% of the weight of the frying oil. The control assembly sends a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbent, so that the weight ratio of magnesium oxide to silicon dioxide is 3:1. The control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank. After the adsorbent quantitative tank is weighed, the automatic valve is opened, the adsorbent enters the mixing tank, and the motor and vacuum pump are started to adsorb. The treatment temperature is 190°C, the time is 40 min, and the vacuum degree is 0.2 MPa. The acid value detector and the polar component detector detect the acid value and the content of the polar component in real time. When both indexes are less than the set value (acid value 0.5 mg / g, polar component 2 wt%), the motor and vacuum pump are turned off, and the oil pump is turned on to transport the oil to the filter for continuous filtration. The filtered oil enters the oil storage tank. The trapped adsorbent remains in the filter, and the next batch of operations is performed. When the filter pressure is higher than 6 mPa, compressed air is turned on to squeeze the residual oil in the filter into the oil storage tank, and then the filter automatic valve is opened to discharge the residual adsorbent, and then the automatic valve is closed for the next batch of operations. Under the operation conditions, the acid value of the adsorbed and filtered frying oil is 0.5 mg / g, the polar component is 2 wt%, and the oil loss is 1.5 wt%.

[0073] Comparative Example

[0074] The frying oil is transported into the mixing tank, and the content of the polar component is detected by the polar component detector, and the acid value is detected by the acid value detector, and the detection signal is sent to the adsorbent quantitative tank control unit. When the acid value of the frying oil is 5 mg / g and / or the content of the polar component is 12 wt%, the adsorbent is quantitatively weighed according to the two index values. The amount of adsorbent is 5 wt% of the weight of the frying oil. The control assembly sends a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbent, so that the weight ratio of magnesium oxide to silicon dioxide is 3:1. The control assembly further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank. After the adsorbent quantitative tank is weighed, the automatic valve is opened, the adsorbent enters the mixing tank, and the motor and vacuum pump are started to adsorb. The treatment temperature is 190°C, the time is 40 min, and the vacuum degree is 0.2 MPa. The acid value detector and the polar component detector detect the acid value and the content of the polar component in real time. When both indexes are less than the set value (acid value 0.5 mg / g, polar component 2 wt%), the motor and vacuum pump are turned off, and the oil pump is turned on to transport the oil to the filter for continuous filtration. The filtered oil enters the oil storage tank. The trapped adsorbent remains in the filter, and the next batch of operations is performed. When the filter pressure is higher than 6 mPa, compressed air is turned on to squeeze the residual oil in the filter into the oil storage tank, and then the filter automatic valve is opened to discharge the residual adsorbent, and then the automatic valve is closed for the next batch of operations. Under the operation conditions, the acid value of the adsorbed and filtered frying oil is 0.5 mg / g, the polar component is 2 wt%, and the oil loss is 1.5 wt%.

[0075] From the first embodiment, the second embodiment and the comparative example, it can be seen that the existing edible oil filtering method needs a large amount of adsorbent, and the oil loss is also larger than that of the present application, and the processing cost is higher. The frying oil treatment method of the present application can significantly reduce the amount of adsorbent, reduce the oil loss, and shorten the frying oil treatment time.

[0076] Although the present application is disclosed as above, the present application is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A method for treating a frying oil, characterized by, The application relates to a method for treating frying oil. The method comprises the following steps: providing frying oil; detecting the acid value and / or the content of polar components of the frying oil; 2. The method for processing a frying oil according to Claim 1, characterized by, providing a matched weight and a corresponding proportion of adsorbent to treat the frying oil according to the acid value and / or the content of polar components of the frying oil, so as to obtain qualified frying oil, wherein the acid value of the qualified frying oil is less than or equal to 0.5 mg / g, and the content of polar components of the qualified frying oil is less than or equal to 2 wt%.

3. The method for processing a frying oil according to claim 2, characterized by, The adsorbent is composed of magnesium oxide and silicon dioxide. The method for treating frying oil according to the acid value and / or the content of polar components of the frying oil comprises the following steps: when the acid value of the frying oil is greater than 0.5 mg / g and less than or equal to 3 mg / g and / or the content of polar components is less than or equal to 10 wt%, a magnesium oxide and silicon dioxide adsorbent with a mass ratio of 1-2:1 is provided to adsorb and treat the frying oil; when the acid value of the frying oil is greater than 3 mg / g and less than or equal to 5 mg / g and / or the content of polar components is greater than 10 wt%, a magnesium oxide and silicon dioxide adsorbent with a mass ratio of 2-3:1 is provided to adsorb and treat the frying oil; 4. The method for processing a frying oil according to Claim 3, characterized by, The amount of the adsorbent is 1 wt%-5 wt% of the weight of the frying oil. The frying oil is adsorbed and treated by a frying oil treatment device, and the frying oil treatment device comprises a mixing tank, a motor and a vacuum pump. The mixing tank is suitable for providing a containing cavity for containing the frying oil and the adsorbent, and stirring blades are arranged in the mixing tank. The motor is connected with the stirring blades.

5. The method for processing a frying oil according to claim 4, wherein The vacuum pump is connected with the mixing tank.

6. The method for processing a frying oil according to claim 4, wherein The treatment temperature is 150 DEG C-190 DEG C, the treatment time is 20 min-40 min, and the vacuum degree is 0.1 MPa-0.5 MPa. The frying oil treatment device further comprises:

7. The method for processing a frying oil according to Claim 6, characterized by, an adsorbent assembly connected with the mixing tank and suitable for providing the adsorbent.

8. The method for processing a frying oil according to Claim 7, characterized by, The adsorbent assembly comprises a plurality of adsorbent dosing tanks, a weighing module and a switch module arranged at the end of each adsorbent dosing tank.

9. The method for processing a frying oil according to Claim 8, characterized by, The number of the adsorbent dosing tanks is 2.

10. The method for processing a frying oil according to Claim 9, characterized by, The acid value of the frying oil is detected by an acid value detector, and the content of polar components of the frying oil is detected by a polar component detector, and the acid value detector and the polar component detector are arranged on the mixing tank.

11. The method for processing a frying oil according to Claim 10, wherein The frying oil treatment device further comprises a control assembly, the weighing module is connected with the control assembly and is suitable for weighing the adsorbent with a matched weight and a corresponding proportion under the control of the control assembly, and the switch module is connected with the control assembly and is suitable for opening or closing the adsorbent dosing tank under the control of the control assembly.

12. The method for processing a frying oil according to Claim 11, characterized by, After the frying oil is adsorbed and treated, the qualified frying oil can be obtained after filtration, and the next batch of frying oil can be treated after the qualified frying oil is obtained. The method for treating frying oil according to the acid value and / or the content of polar components of the frying oil comprises the following steps: When the acid value detector detects that the acid value of the frying oil is 0.5mg / g < acid value≤3mg / g and / or the polar component detector detects that the content of the polar component of the frying oil is ≤10wt%, the control component sends a control instruction to make each of the weighing modules weigh a certain amount of magnesium oxide and silicon dioxide adsorbent, so that the weight ratio of magnesium oxide to silicon dioxide is 1-2:1, and the amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil, and the control component further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank; when the acid value detector detects that the acid value of the frying oil is 3mg / g < acid value≤5mg / g and / or the polar component detector detects that the content of the polar component of the frying oil is >10wt%, the control component sends a control instruction to make each of the weighing modules weigh a certain amount of magnesium oxide and silicon dioxide adsorbent, so that the weight ratio of magnesium oxide to silicon dioxide is 2-3:1, and the amount of the adsorbent is 1wt%-5wt% of the weight of the frying oil, and the control component further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank.

13. A qualified frying-in-oil, characterized in that, The qualified frying oil is obtained by the treatment method of any one of claims 1 to 12.

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