Treatment method of frying oil

Abstract

The invention discloses a processing method of frying oil. The processing method comprises the following steps: providing the frying oil; detecting the acid value of the frying oil and / or the content of polar components; according to the acid value of the frying oil and / or the content of the polar components, providing an adsorbent with matched weight and corresponding proportion to treat the frying oil to obtain qualified frying oil, the acid value of the qualified frying oil is less than or equal to 0.5 mg / g, and the content of the polar components of the qualified frying oil is less than or equal to 2wt%. The frying oil treatment method provided by the invention overcomes the defects of long frying oil treatment time, large oil filter powder addition amount, large frying oil loss, high processing cost and the like in the existing frying oil treatment, and can realize accurate addition of the adsorbent by improving the frying oil treatment method, thereby saving the adsorbent dosage, avoiding large oil loss, and improving the frying oil treatment efficiency. Meanwhile, the color and luster of oil for frying can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of frying oil processing, and in particular to a frying oil processing method. Background Art

[0002] During the frying process of food, the frying oil undergoes hydrolysis, oxidation, polymerization and other reactions under the interaction of high temperature, moisture in the food and oxygen, generating free fatty acids, oxidized triglycerides, oxidized glyceride polymers and other substances, which 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 will lead to a rapid decrease in the frying life of frying oil. my country stipulates in the national food safety standard GB 2716-2018 that when the polar component content of the frying oil is greater than or equal to 27wt% and the acid value is higher than 5mg / g, the frying oil must be discarded and can no longer be used as frying oil. For this reason, during the preparation of fried food, the frying oil needs to be treated in time to remove the polar components to extend its frying life.

[0003] At present, frying oil is generally treated by filtering with filter paper and adsorbing with filter oil powder (mainly composed of magnesium silicate). Among them, the method of adsorption by filter oil powder is a relatively mature method, that is, it is filtered after mixing with frying oil for a certain period of time, so as to obtain frying oil with reduced acid value and polar components. However, different frying oils have different acid values ​​and polar group contents after frying. When the acid value is high, it can be reduced by reacting magnesium oxide with free fatty acids, and the generated fatty acid magnesium can be adsorbed on silicon dioxide. When the polar component content is high, it can be removed by silicon dioxide adsorption. Traditional filter oil powder adsorption does not take into account the changes in acid value and / or polar component content, and generally adopts quantitative addition, and the amount added is much larger than the actual reaction requirement. The adsorbent adsorbs a large amount of grease, which leads to large grease loss and high cost.

[0004] Moreover, the equipment used in the prior art is mainly a mixing tank and a filter, which do not monitor the acid value and peroxide value / polar component index of the frying oil in real time, and have the disadvantages of long frying oil processing time, large amount of oil filter powder added, large frying oil loss and high processing cost. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for processing frying oil, which overcomes the defects of the existing method for processing frying oil, such as long frying oil processing time, large amount of oil filter powder added, large frying oil loss and high processing cost.

[0006] To solve the above problems, an embodiment of the present invention provides a method for processing frying oil, comprising:

[0007] Provide frying oil;

[0008] detecting the acid value and / or the content of polar components of the frying oil;

[0009] According to the acid value and / or polar component content of the frying oil, an adsorbent with matching weight and corresponding ratio is provided to treat the frying oil to obtain qualified frying oil, wherein the acid value of the qualified frying oil is ≤0.5 mg / g, and the polar component content of the qualified frying oil is ≤2 wt%.

[0010] Optionally, the adsorbent consists of magnesium oxide and silicon dioxide.

[0011] Optionally, 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 comprises:

[0012] When the acid value of the frying oil is 0.5 mg / g < acid value ≤ 3 mg / g and / or the content of polar components is ≤ 10 wt%, a magnesium oxide and a silicon dioxide adsorbent in a mass ratio of 1-2:1 are provided to adsorb the frying oil; when the acid value of the frying oil is 3 mg / g < acid value ≤ 5 mg / g and / or the content of polar components is > 10 wt%, a magnesium oxide and a silicon dioxide adsorbent in a mass ratio of 2-3:1 are provided to adsorb the frying oil;

[0013] The adsorbent is used in an amount of 1wt%-5wt% of the frying oil.

[0014] Optionally, the frying oil is subjected to adsorption treatment by a frying oil treatment device, the frying oil treatment device comprising a mixing tank, a motor and a vacuum pump;

[0015] The mixing tank is suitable for providing a containing cavity for accommodating frying oil and adsorbent, and a stirring blade is arranged in the mixing tank;

[0016] The motor is connected to the stirring blade;

[0017] The vacuum pump is connected to the mixing tank.

[0018] Optionally, when the frying oil is subjected to adsorption treatment by the frying oil treatment equipment, the treatment temperature is 150° C.-190° C., the treatment time is 20 min-40 min, and the vacuum degree is 0.1 MPa-0.5 MPa.

[0019] Optionally, the frying oil processing equipment further comprises:

[0020] The adsorbent assembly is connected to the mixing tank and is suitable for providing the adsorbent.

[0021] Optionally, the adsorbent assembly includes a plurality of adsorbent quantitative tanks, and a weighing module and a switch module located at the end of each of the adsorbent quantitative tanks.

[0022] Optionally, the number of the adsorbent quantitative tanks is 2.

[0023] Optionally, the acid value of the frying oil is detected by an acid value detector, and the polar component content 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.

[0024] Optionally, the frying oil processing equipment also includes a control component, the weighing module is connected to the control component, and is suitable for weighing an adsorbent with a weight and a corresponding ratio matching the acid value and / or polar components under the control of the control component; the switch module is connected to the control component, and is suitable for opening or closing the adsorbent quantitative tank under the control of the control component.

[0025] Optionally, the frying oil after the adsorption treatment is filtered to obtain the qualified frying oil, and after obtaining the qualified frying oil, the next batch of frying oil can be processed.

[0026] Optionally, 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 comprises:

[0027] The frying oil is placed in the mixing tank. When the acid value detector detects that the acid value of the frying oil is 0.5 mg / g < acid value ≤ 3 mg / g and / or the polar component detector detects that the content of the polar component of the frying oil is ≤ 10 wt%, the control component 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. 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 issues a control instruction to make each of the weighing modules 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 component further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank.

[0028] Compared with the prior art, the technical solution of the embodiment of the present invention has the following advantages:

[0029] The scheme of the present invention is applied, and the frying oil is treated by providing an adsorbent with matching weight and corresponding proportion according to the acid value and / or polar component content of the frying oil, and the ratio of magnesium oxide and silicon dioxide in the oil filter powder is adjusted in real time, so as to achieve an efficient combination of magnesium oxide removing free fatty acids and silicon dioxide removing polar components, and at the same time, the pigment generated by heating the frying oil is removed by the adsorption of silicon dioxide, and the color of the brown frying oil is reduced to yellow, and the acid value and polar components are reduced by more than 60%. The adsorbent can be added accurately, thereby saving the amount of the adsorbent, avoiding large oil loss, and reducing the color of the frying oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of a method for processing frying oil in an embodiment of the present invention;

[0031] Figure 2 It is a structural schematic diagram of a frying oil processing device in an embodiment of the present invention.

[0032] Among them, 10- frying oil processing 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

[0033] As described in the background technology, polar components are generated during the frying process of food. The presence of polar components will lead to a rapid decrease in the frying life of frying oil. According to the provisions of my country's 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 must be discarded and can no longer be used as frying oil. For this reason, during the preparation of fried food, the frying oil needs to be treated in time to remove the polar components to extend its frying life.

[0034] The inventor has found through research that the existing edible oil filtration system usually includes a mixing tank and a filter. When filtering the frying oil, the oil filter powder and the frying oil are usually placed in a mixing tank, and after mixing for a set time (for example, one hour), the mixture of the oil filter powder and the frying oil is taken as a sample for detection. After the test is qualified, the mixture of the oil filter powder and the frying oil is filtered. If the test is unqualified, add oil filter powder to the mixing tank, remix for a set time, and perform sample testing until the test is qualified. That is, the oil filter powder adsorption method used in the prior art to treat frying oil generally adopts quantitative addition, and there is a problem that the changes in the acid value and / or the content of polar components are not considered, the amount added is much larger than the actual reaction requirement, and the adsorbent adsorbs a large amount of oil, resulting in large oil loss and high cost.

[0035] In order to solve the above technical problems, according to the acid value and / or polar component content of the frying oil, an adsorbent with matching weight and corresponding ratio is provided to treat the frying oil, and the ratio of magnesium oxide and silicon dioxide in the filter oil powder is adjusted in real time to achieve an efficient combination of magnesium oxide removing free fatty acids and silicon dioxide removing polar components. At the same time, the pigment generated by heating the frying oil is removed by the adsorption of silicon dioxide, and the color of the brown frying oil is reduced to yellow, and the acid value and polar components are reduced by more than 60%. The adsorbent can be added accurately, thereby saving the amount of adsorbent, avoiding large oil loss, and reducing the color of the frying oil.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The raw materials, samples, reagents and equipment used in the frying oil treatment method described in the embodiment of the present invention are all commercially available and can be purchased in the market.

[0038] Please refer to Figure 1 , Figure 1 The flowchart of the method for treating frying oil in the embodiment of the present invention is as follows. The method for treating frying oil of the present invention comprises the following steps.

[0039] S100, frying oil provided.

[0040] It should be noted that the frying oil is edible oil used in the food frying process, and its types include but are not limited to palm oil, soybean oil, rapeseed oil, etc.

[0041] S200, detecting the acid value and / or the content of polar components of the frying oil.

[0042] 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 frying oil, such as using a near infrared analyzer for detection. In addition, the polar component content detection method in the prior art can be selected to detect the polar component content of frying oil, such as using an edible oil quality detector for detection.

[0043] S300, 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 to obtain qualified frying oil, wherein the acid value of the qualified frying oil is ≤0.5 mg / g, and the content of polar components of the qualified frying oil is ≤2 wt%.

[0044] In some embodiments, the adsorbent consists of magnesium oxide and silicon dioxide.

[0045] In some embodiments, 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 comprises:

[0046] When the acid value of the frying oil is 0.5 mg / g < acid value ≤ 3 mg / g and / or the content of polar components is ≤ 10 wt%, a magnesium oxide and a silicon dioxide adsorbent in a mass ratio of 1-2:1 are provided to adsorb the frying oil; when the acid value of the frying oil is 3 mg / g < acid value ≤ 5 mg / g and / or the content of polar components is > 10 wt%, a magnesium oxide and a silicon dioxide adsorbent in a mass ratio of 2-3:1 are provided to adsorb the frying oil;

[0047] The adsorbent is used in an amount of 1wt%-5wt% of the frying oil.

[0048] It should be noted that the 0.5 mg / g<acid value ≤3 mg / g and / or the content of polar components ≤10wt% includes satisfying 0.5 mg / g<acid value ≤3 mg / g alone, satisfying the content of polar components ≤10wt% alone, and 0.5 mg / g<acid value ≤3 mg / g and the content of polar components ≤10wt% must all meet three situations; similarly, 3 mg / g<acid value ≤5 mg / g and / or the content of polar components is>10wt% includes satisfying 3 mg / g<acid value ≤5 mg / g alone, satisfying the content of polar components is>10wt% alone, and 3 mg / g<acid value ≤5 mg / g and the content of polar components is>10wt% must all meet three situations.

[0049] Please refer to Figure 2 , Figure 21 is a schematic diagram of the structure of a frying oil treatment device in an embodiment of the present invention. In some embodiments, the frying oil is subjected to adsorption treatment by a frying oil treatment device 10, and the frying oil treatment device 10 comprises a mixing tank 100, a motor 200 and a vacuum pump 300; the mixing tank 100 is suitable for providing a receiving chamber for accommodating frying oil and an adsorbent, and a stirring blade 101 is arranged in the mixing tank 100; the motor 200 is connected to the stirring blade 101; and the vacuum pump 300 is connected to the mixing tank 100. The motor 200 can drive the stirring blade 101 to rotate, thereby realizing the mixing operation of the frying oil and the adsorbent, so that the adsorbent can adsorb the polar components in the frying oil.

[0050] In some embodiments, when the frying oil is subjected to adsorption treatment by the frying oil treatment equipment 10, the treatment temperature is 150° C.-190° C., the treatment time is 20 min-40 min, and the vacuum degree is 0.1 MPa-0.5 MPa.

[0051] Please continue to refer to Figure 2 In some embodiments, the frying oil processing equipment 10 further includes:

[0052] The adsorbent assembly 400 is connected to the mixing tank 100 and is suitable for providing the adsorbent.

[0053] Please continue to refer to Figure 2 In some embodiments, the adsorbent assembly 400 includes a plurality of adsorbent quantitative tanks, and a weighing module and a switch module located at the end of each of the adsorbent quantitative tanks.

[0054] Please continue to refer to Figure 2 In some embodiments, the number of the adsorbent quantitative tanks is 2. Specifically, the adsorbent assembly 400 includes a first adsorbent quantitative tank 401 and a second adsorbent quantitative tank 402. The first adsorbent quantitative tank 401 is provided with a first weighing module 4011 and a first switch module 4012 at the end thereof, and the second adsorbent quantitative tank 402 is provided with a second weighing module 4021 and a second switch module 4022 at the end thereof. In specific use, the first component (e.g., magnesium oxide) in the adsorbent can be placed in the first adsorbent quantitative tank, and the second component (e.g., silicon dioxide) in the adsorbent can be placed in the second adsorbent quantitative tank, so as to facilitate subsequent quantitative weighing operations.

[0055] Furthermore, in order to achieve real-time detection of the acid value and / or polar component content of the frying oil, in one embodiment, the real-time detection of the acid value of the frying oil can be achieved by an acid value detector, and the real-time detection of the polar component of the frying oil can be achieved by a polar component detector.

[0056] Please continue to refer to Figure 2In one embodiment, the acid value of the frying oil is detected by an acid value detector 901, and the polar component content 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 mixture of the frying oil and the adsorbent reflects the white light, it reaches the diffraction grating through the optical fiber sensor, and then is transmitted to the diode detection array after being split by the diffraction grating, and the signal obtained by the diode detection array is irradiated on the photodiode, and the acid value detector obtains the signal sent by the photodiode and obtains the acid value detection result. Optionally, the polar component detector 902 includes: an electromagnetic wave generating structure and a dielectric constant detection structure, and detects the dielectric constant value of the frying oil, and obtains the polar component detection result based on the dielectric constant value.

[0057] By using the acid value detector 901 and the polar component detector 902, the acid value and polar component content can be detected without taking out the frying oil sample separately, avoiding the increase in filtration time due to taking samples, and further shortening the time required for filtration. In addition, the loss of frying oil due to taking out part of the sample separately can be avoided, thereby reducing the filtration cost.

[0058] Please continue to refer to Figure 2 In some embodiments, the frying oil processing equipment 10 further includes a control component 500, and the weighing module (e.g., the first weighing module 4011, the second weighing module 4021) is connected to the control component 500, and is suitable for weighing the adsorbent with a weight and a corresponding ratio matching the acid value and / or polarity component under the control of the control component 500; the switch module (e.g., the first switch module 4012, the second switch module 4022) is connected to the control component 500, and is suitable for opening or closing the adsorbent quantitative tank (e.g., the first adsorbent quantitative tank 401, the second adsorbent quantitative tank 402) under the control of the control component 500. In addition, the acid value detector 901 and the polar component detector 902 are also connected to the control component 500 respectively, and timely obtain the detection signals of the acid value detector and the polar component detector, and issue instructions to the weighing module (e.g., the first weighing module 4011, the second weighing module 4021) and the switch module (e.g., the first switch module 4012, the second switch module 4022) based on the acid value and polar component detection results.

[0059] It should be further explained that the control component 500 can control the addition of the adsorbent based on the current oil quality test result of the frying oil, rather than adding the adsorbent in a fixed amount each time. Specifically, in the initial state, the control component 500 performs an initial test on the frying oil to obtain an initial oil quality test result. At this time, the control component 500 can control the weighing module (e.g., the first weighing module 4011, the second weighing module 4021) to weigh the adsorbent that matches the initial oil quality test result. After the frying oil and the adsorbent are mixed for a certain period of time, the intermediate oil quality test result can be obtained again. If the intermediate oil quality test result is still greater than or equal to the preset oil quality test target, the control component 500 can control the weighing module (e.g., the first weighing module 4011, the second weighing module 4021) to weigh the adsorbent that matches the intermediate oil quality test result, without adding the adsorbent that matches the initial oil quality test result, thereby reducing the amount of adsorbent added and further reducing the filtration cost.

[0060] In some embodiments, after filtering the frying oil after adsorption treatment, the qualified frying oil can be obtained. After obtaining the qualified frying oil, the next batch of frying oil can be processed. It should be noted that the frying oil after adsorption treatment is filtered because the adsorbent for adsorption treatment is distributed in the frying oil, so it needs to be filtered out. In industrial applications, the frying oil after adsorption treatment can be filtered by a filter.

[0061] Please continue to refer to Figure 2 In one embodiment, the frying oil processing equipment 10 further includes a filter 600 and an oil storage tank 700. One end of the filter 600 is connected to the mixing tank 100 through an oil pump 800, and the other end of the filter 600 is connected to the oil storage tank 700. A filter screen is provided 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 adsorbent or with very low adsorbent content.

[0062] In some embodiments, 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 comprises:

[0063] The frying oil is placed in the mixing tank. When the acid value detector detects that the acid value of the frying oil is 0.5 mg / g < acid value ≤ 3 mg / g and / or the polar component detector detects that the content of the polar component is ≤ 10 wt %, the control component 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 1 wt %-5 wt % of the weight of the frying oil. 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 polar components is>10wt%, the control component issues a control instruction to make each of the weighing modules 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 component further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank.

[0064] Specifically in an industrial application scenario, the frying oil processing method is:

[0065] The frying oil is transported to the mixing tank 100, and the acid value of the frying oil is detected in real time by the acid value detector 901, and the polar component content of the frying oil is detected in real time by the polar component detector 902, and the detection signal is transmitted to the control component 500. According to the two index values, the adsorbent quantitative tank (for example, the first adsorbent quantitative tank 401, the second adsorbent quantitative tank 402) quantitatively weighs the adsorbent with a weight and a corresponding ratio matching the acid value and / or polar component. 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 0.5 mg / g < acid value ≤ 3 mg / g and / or the content of the polar component is ≤ 10%, the control component 500 issues a control instruction to make each of the weighing modules (e.g., the first weighing module 4011, the second weighing module 4021) 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 control component 500 further controls the switch module (e.g., the first switch module 4012, the second switch module 4022) to open the adsorbent quantitative tank (e.g., the first adsorbent quantitative tank 401, the second adsorbent quantitative tank 402), release the adsorbent into the mixing tank 100, and start the motor 200 and the vacuum pump 300 for adsorption; when the acid value of the frying oil is 3 mg / g < acid value ≤ 5 ... When the content of the component is greater than 10wt%, the control component 500 issues a control instruction to make each weighing module (e.g., the first weighing module 4011, the second weighing module 4021) 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 control component 500 further controls the switch module (e.g., the first switch module 4012, the second switch module 4022) to open the adsorbent quantitative tank (e.g., the first adsorbent quantitative tank 401, the second adsorbent quantitative tank 402) to release the adsorbent into the mixing tank 100; after the adsorbent quantitative tank (e.g., the first adsorbent quantitative tank 401, the second adsorbent quantitative tank 402) weighs, the automatic valve is opened, the adsorbent enters the mixing tank 100, and the motor 200 and the vacuum pump 300 are turned on for adsorption. The processing temperature is 150℃-190℃, the time is 20min-40min, and the vacuum degree is 0.1MPa-0.5MPa. The acid value detector 901 and the polar component detector 902 can detect the acid value and 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 200 and the vacuum pump 300 are turned off, and the oil pump 800 is turned on to transport the oil to the filter 600 for continuous filtration. The filtered grease enters the oil storage tank 700. The trapped adsorbent is retained in the filter 600, and then the next batch of operations are carried out.When the pressure of the filter 600 is higher than 6mPa, the compressed air is turned on to squeeze the residual oil in the filter 600 into the oil storage tank 700, and then the automatic valve of the filter is opened to discharge the residual adsorbent, and then the automatic valve is closed to carry out the next batch of operations.

[0066] In addition, the embodiment of the present invention also provides a qualified frying oil, which is obtained by the frying oil processing method described in the embodiment of the present invention. The qualified frying oil prepared by the embodiment of the present invention has an acid value of ≤0.5 mg / g and a polar component content of ≤2 wt%, which meets the provisions of my country's national food safety standard GB 2716-2018 and can continue to be used, extending its frying life.

[0067] The advantages of the frying oil treatment method of the present invention are described below by comparing the first embodiment, the second embodiment, and the comparative example. The first embodiment and the second embodiment are both implemented by the frying oil treatment device 10 described above, and the comparative example is implemented by a frying oil treatment device in the prior art that does not perform real-time detection of acid value and polar components.

[0068] First embodiment

[0069] The frying oil is transported to the mixing tank, and the polar component content is detected by the polar component detector, and the acid value detector is used to detect the acid value. The detection signal is sent to the control component. When the acid value of the frying oil is 3mg / g and the content of the polar component is 7wt%, the amount of the adsorbent is 2wt% of the weight of the frying oil. The control component issues a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbents respectively, and the weight ratio of magnesium oxide to silicon dioxide is 1:1. The control component further controls the switch module to open the adsorbent quantitative tank, release the adsorbent into the mixing tank, and turn on the motor and vacuum pump for adsorption. The processing temperature is 160℃, the time is 30min, and the vacuum degree is 0.1MPa. The acid value detector and the polar component detector detect the acid value and polar component content in real time. When both indicators are less than the set value (acid value 0.5mg / g, polar component 2wt%), the motor and vacuum pump are turned off, the oil pump is turned on, and the oil is transported to the filter for continuous filtration. The filtered grease enters the oil storage tank. The trapped adsorbent is retained in the filter and then the next batch of operations is carried out. When the filter pressure is higher than 6mPa, the compressed air is turned on to squeeze the residual oil from the filter into the oil storage tank, the automatic valve of the filter is opened to discharge the residual adsorbent, and then the automatic valve is closed to carry out the next batch of operations. Under this operating condition, the acid value of the frying oil after adsorption and filtration is 0.4mg / g, the polar component content is 1.6wt%, and the oil loss is 0.6wt%.

[0070] Second embodiment

[0071] The frying oil is transported to the mixing tank, and the polar component content is detected by the polar component detector, and the acid value detector is used to detect the acid value. The detection signal is sent to the adsorbent quantitative tank control unit. When the acid value of the frying oil is 5mg / g and / or the content of the polar component is 12wt%, the adsorbent quantitative tank is quantitatively weighed according to the two index values. The amount of adsorbent is 5wt% of the weight of the frying oil. The control component issues a control instruction to make each weighing module weigh a certain amount of magnesium oxide and silicon dioxide adsorbents respectively, so that the weight ratio of magnesium oxide to silicon dioxide is 3:1. The control component further controls the switch module to open the adsorbent quantitative tank and release the adsorbent into the mixing tank; after the adsorbent quantitative tank is weighed, the automatic valve is opened, and the adsorbent enters the mixing tank, and the motor and vacuum pump are turned on at the same time for adsorption. The processing temperature is 190℃, the time is 40min, and the vacuum degree is 0.2MPa. The acid value detector and polar component detector detect the acid value and polar component content in real time. When both indicators are less than the set value (acid value 0.5mg / g, polar component 2wt%), the motor and vacuum pump are turned off, the oil pump is turned on, the oil is transported to the filter, and continuous filtering is performed. The filtered grease enters the oil storage tank. The trapped adsorbent is retained in the filter, and the next batch of operations is performed afterwards. When the filter pressure is higher than 6mPa, the compressed air is turned on to squeeze the filter residual oil into the oil storage tank, the filter automatic valve is turned on, the residual adsorbent is discharged, and the automatic valve is closed afterwards, and the next batch of operations is performed. Under this operating condition, the acid value of the frying oil after adsorption and filtration is 0.5mg / g, the polar component is 2wt%, and the grease loss is 1.5wt%.

[0072] Comparative Example

[0073] The frying oil is transported to a mixing tank and an adsorbent is added. The amount of adsorbent is 6wt% of the weight of the frying oil. Then the motor and vacuum pump are turned on for adsorption. The treatment temperature is 160°C, the time is 60min, and the vacuum degree is 0.2MPa. Then the motor and vacuum pump are turned off, the oil pump is turned on, and the oil is transported to the filter for continuous filtration. The filtered grease enters the oil storage tank. The trapped adsorbent is retained in the filter, and then the next batch of operations is carried out. When the filter pressure is higher than 6mPa, the compressed air is turned on to squeeze the residual oil from the filter into the oil storage tank, the automatic valve of the filter is opened, the residual adsorbent is discharged, and then the automatic valve is closed for the next batch of operations. Under this operating condition, the acid value of the frying oil after adsorption and filtration is 0.5mg / g, the polar component is 2wt%, and the grease loss is 1.8wt%.

[0074] It can be seen from the first embodiment, the second embodiment and the comparative example that the existing edible oil filtering method requires a large amount of adsorbent, and the oil loss is also greater than that of the present invention, and the processing cost is high. However, the frying oil treatment method of the present invention can significantly reduce the amount of adsorbent, reduce oil loss, and shorten the frying oil treatment time.

[0075] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for processing frying oil, characterized in that: include: Provide frying oil; detecting the acid value and / or the content of polar components of the frying oil; According to the acid value and / or polar component content of the frying oil, an adsorbent with matching weight and corresponding ratio is provided to treat the frying oil to obtain qualified frying oil, wherein the acid value of the qualified frying oil is ≤0.5 mg / g, and the polar component content of the qualified frying oil is ≤2 wt%.

2. The method for treating frying oil according to claim 1, wherein: The adsorbent consists of magnesium oxide and silicon dioxide.

3. The method for treating frying oil according to claim 2, wherein: The step of providing an adsorbent with a matching weight and a corresponding proportion according to the acid value and / or the content of polar components of the frying oil to treat the frying oil comprises: When the acid value of the frying oil is 0.5 mg / g < acid value ≤ 3 mg / g and / or the content of the polar component is ≤ 10 wt %, a magnesium oxide and a silicon dioxide adsorbent in a mass ratio of 1-2:1 are provided to adsorb the frying oil; when the acid value of the frying oil is 3 mg / g < acid value ≤ 5 mg / g and / or the content of the polar component is > 10 wt %, a magnesium oxide and a silicon dioxide adsorbent in a mass ratio of 2-3:1 are provided to adsorb the frying oil; The adsorbent is used in an amount of 1wt%-5wt% of the frying oil.

4. The method for treating frying oil according to claim 3, wherein: The frying oil is subjected to adsorption treatment by a frying oil treatment device, wherein 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 accommodating the frying oil and the adsorbent, and a stirring blade is arranged in the mixing tank; The motor is connected to the stirring blade; The vacuum pump is connected to the mixing tank.

5. The method for treating frying oil according to claim 4, characterized in that: When the frying oil is subjected to adsorption treatment by the frying oil treatment equipment, the treatment temperature is 150° C.-190° C., the treatment time is 20 min-40 min, and the vacuum degree is 0.1 MPa-0.5 MPa.

6. The method for treating frying oil according to claim 4, wherein: The frying oil processing equipment also includes: The adsorbent assembly is connected to the mixing tank and is suitable for providing the adsorbent.

7. The method for treating frying oil according to claim 6, characterized in that: The adsorbent assembly includes a plurality of adsorbent quantitative tanks, and a weighing module and a switch module located at the end of each of the adsorbent quantitative tanks.

8. The method for treating frying oil according to claim 7, characterized in that: The number of the adsorbent quantitative tanks is 2.

9. The method for treating frying oil according to claim 8, characterized in that: The acid value of the frying oil is detected by an acid value detector, and the polar component content of the frying oil is detected by a polar component detector. The acid value detector and the polar component detector are respectively arranged on the mixing tank.

10. The method for treating frying oil according to claim 9, characterized in that: The frying oil processing equipment also includes a control component, the weighing module is connected to the control component, and is suitable for weighing the adsorbent with a weight and a corresponding ratio matching the acid value and / or polarity component under the control of the control component; the switch module is connected to the control component, and is suitable for opening or closing the adsorbent quantitative tank under the control of the control component.

11. The method for treating frying oil according to claim 10, characterized in that: After filtering the frying oil after the adsorption treatment, the qualified frying oil can be obtained. After obtaining the qualified frying oil, the next batch of frying oil can be processed.

12. The method for treating frying oil according to claim 11, characterized in that: The step of providing an adsorbent with a matching weight and a corresponding proportion according to the acid value and / or the content of polar components of the frying oil to treat the frying oil comprises: The frying oil is placed in the mixing tank. When the acid value detector detects that the acid value of the frying oil is 0.5 mg / g < acid value ≤ 3 mg / and / or the polar component detector detects that the content of the polar component of the frying oil is ≤ 10 wt%, the control component 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 1 wt%-5 wt% of the weight of the frying oil. 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 issues a control instruction to make each of the weighing modules 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 component further controls the switch module to open the adsorbent quantitative tank to release the adsorbent into the mixing tank.

13. A qualified frying oil, characterized in that: The qualified frying oil is obtained by processing the frying oil according to any one of claims 1 to 12.

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