A method for improving moderately processed micronutrients and an automated control system

Abstract

The present invention provides an automatic control system for two-stage trapping and reflux of vegetable oil deodorization, which includes a deodorization tower, two-stage trapping towers, a high-concentration FAD tank, a low-concentration FAD tank, a decolorized oil temporary storage tank, heat exchanger A, heat exchanger B, heat exchanger C, a heater, and a vacuum system. The present invention also provides a method for deodorizing vegetable oil using this system, a method for producing vegetable oil, and a method for preparing blended oil. The present invention can solve the problems of production automation of the two-stage trapping and reflux process of vegetable oil deodorization, as well as the problems of accurately controlling the reflux flow rate and the retention rates of VE and sterols in the obtained oil and fat.

Description

Technical Field

[0001] The invention relates to a method for preparing oil, and in particular to a method for improving trace nutrients through moderate processing and an automatic control system. Background Art

[0002] Micronutrients such as VE, sterols, and squalene in vegetable oils have very important physiological effects. VE can resist oxidation, maintain reproductive function and immune function, and sterols can reduce serum cholesterol levels and have anti-cancer effects. The 2013 DRIs recommended reference intake for Chinese adults is 14 mg α-TE / d, the specific recommended value for sterols is 0.9 g / d, and the phytosterol ester is 1.5 g / d. Vegetable oil is the main source of VE and sterols in the diet, and Chinese people can supplement these micronutrients through the daily intake of vegetable oil. However, vegetable oils are often over-processed, and the loss of trace components is inevitable during the refining process, such as the loss of sterols caused by soap stock entrainment during alkali refining, the loss of sterols caused by bleaching soil adsorption, and the loss of VE and sterols caused by deodorization distillation, which makes the loss rate of VE and sterols in vegetable oils as high as more than 20%.

[0003] In the Chinese patent CN201110427029.4 and the patent application CN201110233051.5, corresponding measures are taken in the deodorization process, mainly to reduce the amount of stirring steam and the deodorization temperature, improve the structure of the deodorization tower, and minimize the oxidation of oil and the loss of natural antioxidants. At the same time, two deodorization distillate traps are set up, and VE, sterols and fatty acids are captured separately by controlling the different temperatures of the two traps, and the distillate rich in VE and sterols is added back to the deodorized oil or added to the deodorized oil (the second to last layer of the deodorization tower) after at least one deodorization cycle, so as to reduce the loss of beneficial components VE and sterols. The above method can control the VE deodorization loss rate to 2-5%, and the sterol deodorization loss rate to 4-8%.

[0004] The specific reflux operation mentioned in Chinese patent application CN201120295648.8 is: when the liquid level of the sterol and VE temporary storage tank is high, the valve leading to the deodorization tower of sterol and VE is opened, and the sterol and VE are pumped into the deodorization tower at the second to last layer of the deodorization tower through the sterol and VE delivery pump, thereby increasing the sterol and VE content in the vegetable oil.

[0005] The above two-stage capture and reflux scheme will encounter many practical operation difficulties in actual production. For example, when the processed oil products are switched frequently, the sterol and VE storage tanks need to be emptied first and then the distillates rich in VE and sterol corresponding to the oil products are collected. However, the quantity is difficult to reach the high-level alarm of the liquid level to achieve reflux. The reflux amount of such operation is also difficult to control. The reflux amounts of VE and sterol in the final product are unknown and uncontrollable. Moreover, if the reflux is excessive, the quality of the final product, especially the conventional indicators (acid value and color), will be affected, which is not conducive to product quality control. Eventually, it is difficult to achieve the automated production and control of the two-stage capture and reflux process for multiple oil products in the factory. Summary of the Invention

[0006] To solve the problems of the above scheme, the present invention provides an automated control system for two-stage capture and reflux in vegetable oil deodorization. Compared with the prior art, the present invention can solve the problem of production automation of the two-stage capture and reflux process in vegetable oil deodorization, as well as the problems of accurately controlling the reflux amount and the retention rates of VE and sterol in the final product.

[0007] The automated control system for two-stage capture and reflux in vegetable oil deodorization provided by the present invention includes a deodorization tower 1, a two-stage capture tower 19, a high-concentration FAD tank 4, a low-concentration FAD tank 5, a decolorized oil storage tank 8, a heat exchanger A 10, a heat exchanger B 11, a heat exchanger C 12, a heater 9, and a vacuum system 20. Among them,

[0008] The decolorized oil storage tank 8 is connected to the deodorization tower 1 through the heat exchanger C 12 and the heater 9 to add decolorized oil to the upper part of the deodorization tower 1 from the deodorization tower 1.

[0009] The deodorization tower 1 is connected to the two-stage capture tower to capture the fatty acid distillates distilled from the deodorization tower 1. The two-stage capture tower includes a high-temperature capture tower 2 and a low-temperature capture tower 3, and the fatty acid distillates pass through the high-temperature capture tower 2 and the low-temperature capture tower 3 in sequence.

[0010] The high-temperature capture tower 2 is connected to the high-concentration FAD tank 4, and the high-concentration FAD tank 4 is connected to the high-temperature capture tower 2 through the heat exchanger B 11 to form a high-concentration FAD cyclic capture system that returns from the high-temperature capture tower 2 through the high-concentration FAD tank 4 and then back to the high-temperature capture tower 2.

[0011] The low-temperature capture tower 3 is connected to the low-concentration FAD tank 5, and the low-concentration FAD tank 5 is connected to the low-temperature capture tower 3 through the heat exchanger A 10 to form a low-concentration FAD cyclic capture system that returns from the low-temperature capture tower 3 through the low-concentration FAD tank 5 and then back to the low-temperature capture tower 3.

[0012] The high-concentration FAD tank 4 is also connected to the decolorized oil storage tank 8 to return the high-concentration FAD to the decolorized oil storage tank 8.

[0013] The vacuum system is respectively connected to the deodorization tower 1 and the two-stage capture tower.

[0014] In a specific embodiment of the present invention, the high-concentration FAD tank 4 is connected to the high-concentration FAD temporary storage tank 6, preferably in a two-way connection, to control the amount of high-concentration FAD in the high-concentration FAD tank 4.

[0015] In a specific embodiment of the present invention, the high-concentration FAD temporary storage tank 6 is provided with one or more temporary storage tanks. Preferably, it includes a soybean oil high-concentration FAD temporary storage tank 6.1, a rapeseed oil high-concentration FAD temporary storage tank 6.2, a corn oil high-concentration FAD temporary storage tank 6.3, and / or a sunflower oil high-concentration FAD temporary storage tank 6.4.

[0016] In a specific embodiment of the present invention, the low-concentration FAD tank 5 is connected to the low-concentration FAD temporary storage tank 7 to control the amount of low-concentration FAD in the low-concentration FAD tank 5.

[0017] In a specific embodiment of the present invention, the deodorization tower 1 includes a plate tower, or a packed tower, or a combination of the plate tower and the packed tower.

[0018] In a specific embodiment of the present invention, the two-stage capture tower 19 has a packed structure. Among them, the high-temperature capture temperature range of the high-temperature capture tower 2 is 130-160°C, and the low-temperature capture range of the low-temperature capture tower 3 is 40-100°C.

[0019] In a specific embodiment of the present invention, the automated control system is controlled using a central control system.

[0020] The present invention also provides a method for deodorizing vegetable oil.

[0021] The method for deodorizing vegetable oil provided by the present invention includes preparation using the aforementioned two-stage capture and reflux automated control system for vegetable oil deodorization.

[0022] The present invention also provides a method for producing vegetable oil.

[0023] The method provided by the present invention includes the step of deodorizing the bleached oil through the aforementioned two-stage capture and reflux automated control system for vegetable oil deodorization. Optionally, the method may further include one or more steps of degumming, deacidification, bleaching, and dewaxing.

[0024] In the present invention, the vegetable oil may be one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower oil, cottonseed oil, olive oil, hydrogenated oil, and palm oil. Preferably, it is one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, and linseed oil.

[0025] The present invention also provides a method for producing blended oil, characterized in that the method comprises

[0026] A) a step of preparing vegetable oil by using the aforementioned method for producing vegetable oil, and,

[0027] B) a step of blending the degreased oil prepared in step A with other oils and fats; the other oils and fats include animal oil or vegetable oil.

[0028] In the present invention, the vegetable oil may be one or more of soybean oil, rapeseed oil, corn oil, sunflower seed oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower seed oil, cottonseed oil, olive oil, hydrogenated oil, palm oil, preferably one or more of soybean oil, rapeseed oil, corn oil, sunflower seed oil, rice bran oil and linseed oil; the animal oil is preferably one or more selected from lard, beef tallow, mutton tallow, fish oil. Description of the Drawings

[0029] Figure 1 , showing the automatic control system for two-stage trapping and reflux of vegetable oil deodorization of the present invention, wherein,

[0030] 1 is a deodorization tower, 2 is a high-temperature trapping tower in the two-stage trapping tower, 3 is a low-temperature trapping tower in the two-stage trapping tower, 4 is a high-concentration FAD tank, 5 is a low-concentration FAD tank, 6 is a high-concentration FAD temporary storage tank ( Figure 1 which are respectively soybean oil high-concentration FAD temporary storage tank 6.1, rapeseed oil high-concentration FAD temporary storage tank 6.2, corn oil high-concentration FAD temporary storage tank 6.3 and sunflower seed oil high-concentration FAD temporary storage tank 6.4), 7 is a low-concentration FAD temporary storage tank, 8 is a decolorized oil temporary storage tank, 9 is a heater, 10 is heat exchanger A, 11 is heat exchanger B, 12 is heat exchanger C, 13 is pump A, 14 is pump B, 15 is pump C, 16 is pump D, 17 is pump E, 18 is a flowmeter, 19 is a two-stage trapping tower, 20 is a vacuum system. Detailed Embodiments

[0031] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as in the embodiments) can be combined with each other to form preferred technical solutions.

[0032] The present invention provides an automatic control system for two-stage trapping and reflux of vegetable oil deodorization.

[0033] The automatic control system for two-stage trapping and reflux of vegetable oil deodorization provided by the present invention comprises a deodorization tower 1, a two-stage trapping tower 19, a high-concentration FAD tank 4, a low-concentration FAD tank 5, a decolorized oil temporary storage tank 8, heat exchanger A 10, heat exchanger B 11, heat exchanger C 12, a heater 9, a vacuum system 20, wherein,

[0034] The decolorized oil temporary storage tank 8 is connected to the deodorization tower 1 through the heat exchanger C12 and the heater 9 to add the decolorized oil to the upper part of the deodorization tower 1;

[0035] The deodorization tower 1 is connected to the two-stage capture tower 19 to capture the fatty acid distillate distilled from the deodorization tower 1; the two-stage capture tower 19 includes a high-temperature capture tower 2 and a low-temperature capture tower 3, and the fatty acid distillate passes through the high-temperature capture tower 2 and the low-temperature capture tower 3 in sequence;

[0036] The high-temperature capture tower 2 is connected to the high-concentration FAD tank 4, and the high-concentration FAD tank 4 is connected to the high-temperature capture tower 2 through the heat exchanger B11 to form a high-concentration FAD circulating capture system that returns from the high-temperature capture tower 2 through the high-concentration FAD tank 4 to the high-temperature capture tower 2;

[0037] The low-temperature capture tower 3 is connected to the low-concentration FAD tank 5, and the low-concentration FAD tank 5 is connected to the low-temperature capture tower 3 through the heat exchanger A10 to form a low-concentration FAD circulating capture system that returns from the low-temperature capture tower 3 through the low-concentration FAD tank 5 to the low-temperature capture tower 3;

[0038] The high-concentration FAD tank 4 is also connected to the decolorized oil temporary storage tank 8 to return the high-concentration FAD to the decolorized oil temporary storage tank 8;

[0039] The vacuum system is respectively connected to the deodorization tower 1 and the two-stage capture tower.

[0040] Preferably, the high-concentration FAD added to the high-temperature capture tower 2 through the heat exchanger B11 is sprayed into the high-temperature capture tower 2 using a nozzle.

[0041] Preferably, the low-concentration FAD added to the low-temperature capture tower 3 through the heat exchanger A10 is sprayed into the low-temperature capture tower 3 using a nozzle.

[0042] Preferably, for ease of operation and control, according to actual needs, a high alarm level H, a medium alarm level M, and / or a low alarm level L are respectively set in the high-concentration FAD tank 4; according to the actual situation, the high alarm level H is usually set to 80-95% of the tank volume, such as 80%, 85%, 90%, 95%; the low alarm level L is usually set to 5-10% of the tank volume, such as 5%, 6%, 7%, 8%, 9%, 10%; the medium alarm level M is usually set to 40-60% of the tank volume, such as 40%, 45%, 50%, 55%, 60%.

[0043] In a specific embodiment of the present invention, the high alarm level H is set to 90% of the tank volume, the low alarm level L is set to 5% of the tank volume, and the medium alarm level M is set to 50% of the tank volume.

[0044] Similarly, the low-concentration FAD tank 5 can also be provided with corresponding reporting points, which can be the same as those in the high-concentration FAD tank 4 or different from those in the high-concentration FAD tank 4.

[0045] Preferably, the high-concentration FAD tank 4 can also be bidirectionally connected to the high-concentration FAD temporary storage tank 6 to control the amount of high-concentration FAD in the high-concentration FAD tank 4. Specifically, when the amount of high-concentration FAD in the high-concentration FAD tank 4 is relatively large (for example, reaching or higher than Figure 1 the high reporting position H in), the connection between the high-concentration FAD tank 4 and the high-concentration FAD temporary storage tank 6 is opened to inject the high-concentration FAD in the high-concentration FAD tank 4 into the high-concentration FAD temporary storage tank 6; when the high-concentration FAD in the high-concentration FAD tank 4 is insufficient (for example, reaching or lower than Figure 1 the low reporting position H in), the connection between the high-concentration FAD temporary storage tank 6 and the high-concentration FAD tank 4 is made to replenish the high-concentration FAD in the high-concentration FAD temporary storage tank 6 into the high-concentration FAD tank 4.

[0046] Preferably, when the deodorization tank is required to produce multiple types of oils, the high-concentration FAD temporary storage tank 6 can be set as multiple temporary storage tanks according to different oil types. For example, as Figure 1 shown, it is set as temporary storage tanks for soybean oil, rapeseed oil, corn oil, and sunflower oil, specifically: soybean oil high-concentration FAD temporary storage tank 6.1, rapeseed oil high-concentration FAD temporary storage tank 6.2, corn oil high-concentration FAD temporary storage tank 6.3, and sunflower oil high-concentration FAD temporary storage tank 6.4, so as to be connected to the temporary storage tank of the corresponding oil type according to the oil type processed in the deodorization step, thereby avoiding mixing with other oils.

[0047] Preferably, the low-concentration FAD tank 5 can also be connected to the low-concentration FAD temporary storage tank 7 to control the amount of low-concentration FAD in the low-concentration FAD tank 5. Specifically, when the low-concentration FAD in the low-concentration FAD tank 5 is relatively large, the connection between the low-concentration FAD tank 5 and the low-concentration FAD temporary storage tank 7 is opened to inject the low-concentration FAD in the low-concentration FAD tank 5 into the low-concentration FAD temporary storage tank 7.

[0048] Preferably, the deodorization tower 1 can include a plate tower and / or a packed tower or various combinations of the two towers.

[0049] Preferably, the two-stage capture tower is of a packed structure. The high-temperature capture temperature range of the high-temperature capture tower 2 is 130 - 160 °C, and the low-temperature capture range of the low-temperature capture tower 3 is 40 - 100 °C;

[0050] In the present invention, the term "FAD" refers to fatty acid distillate, wherein the term "high-concentration FAD" refers to fatty acid deodorization distillate with a high VE content (e.g., 8 - 15%), which is captured by the high-temperature capture tower 2, and the term "low-concentration FAD" refers to fatty acid deodorization distillate with a low VE content (1 - 4%), which is captured by the low-temperature capture tower 3.

[0051] For the convenience of use, the automatic control system for two-stage capture and reflux of vegetable oil deodorization provided by the present invention can be controlled using a central control system.

[0052] For the convenience of use, pumps (for example, one or more pumps can be added at the positions of pump A13 to pump E17) or devices with similar functions can be added at appropriate positions in the automatic control system for two-stage capture and reflux of vegetable oil deodorization provided by the present invention. Figure 1 Pump A13 to pump E17) or devices with similar functions.

[0053] For the convenience of control, a flow meter 18 can be added to the automatic control system for two-stage capture and reflux of vegetable oil deodorization provided by the present invention.

[0054] For the convenience of operation, valves or devices with similar functions can be used in the connecting pipelines in the automatic control system for two-stage capture and reflux of vegetable oil deodorization provided by the present invention to control the opening and closing. The specific setting positions of the valves can be selected by those skilled in the art according to the actual situation. For example, as Figure 1 shown, valves can be set between the high-concentration FAD tank 4 and the high-concentration FAD temporary storage tank 6, between the high-concentration FAD temporary storage tank 6 and the high-concentration FAD tank 4, between the high-concentration FAD tank 4 and the decolorized oil temporary storage tank 8, and / or between the low-concentration FAD tank 5 and the low-concentration FAD temporary storage tank 7.

[0055] In a specific embodiment of the present invention, as Figure 1 shown, after being captured and condensed, the high-concentration FAD enters the high-concentration FAD tank 4 and undergoes cyclic capture through pump B14 and heat exchanger B11. When the liquid level in the high-concentration FAD tank 4 reaches the high alarm level H, the upper valve corresponding to the oil type automatically opens, and the upper valves of other oil types are in a closed state. The high-concentration FAD is pumped into the high-concentration FAD temporary storage tank 6 corresponding to the oil type (for example, the high-concentration FAD of soybean oil enters the high-concentration FAD temporary storage tank 6.1 of soybean oil, and the rapeseed oil enters the high-concentration FAD temporary storage tank 6.2 of rapeseed oil). When the liquid level reaches the medium alarm level M, the upper valve automatically closes.

[0056] In a specific embodiment of the present invention, before switching the processed oil type, the high-concentration FAD in the high-concentration FAD tank 4 is pumped by pump B14 to the corresponding oil type high-concentration FAD temporary storage tank 6 (for example, the high-concentration FAD of soybean oil enters the soybean oil high-concentration FAD temporary storage tank 6.1, and the rapeseed oil enters the rapeseed oil high-concentration FAD temporary storage tank 6.2) to empty the high-concentration FAD tank 4. When the decolorized oil temporary storage tank 8 starts to receive oil, pump B14 and the upper valve (i.e., the valve between the high-concentration FAD tank 4 and the high-concentration FAD temporary storage tank 6) are in the closed state, pump C15 and the corresponding oil type lower valve (i.e., the valve between the high-concentration FAD temporary storage tank 6 and the high-concentration FAD tank 4) are opened, and the high-concentration FAD in the corresponding oil type high-concentration FAD temporary storage tank 6 (for example, the high-concentration FAD of soybean oil enters the soybean oil high-concentration FAD temporary storage tank 6.1, and the rapeseed oil enters the rapeseed oil high-concentration FAD temporary storage tank 6.2) is pumped back to the high-concentration FAD tank 4 to the medium reporting position M, then pump C15 and the lower valve are closed, pump B14 and the reflux valve are opened, and the high-concentration FAD reflux starts; the oil in the decolorized oil tank passes through pump D16, heat exchanger C12, and is heated to the required temperature for deodorization by heater 9 and then enters the deodorization tower 1. The deodorization process maintains a vacuum. After deodorization, the deodorized oil passes through heat exchanger C12 and pump E to become deodorized vegetable oil;

[0057] Among them, if the liquid level in the high-concentration FAD tank 4 during the reflux reaches the low reporting position L, the above process is repeated to adjust the liquid level to the medium reporting position M. If the liquid level reaches the high reporting position H, the high-concentration FAD is pumped into the corresponding oil type high-concentration FAD temporary storage tank 6 (for example, the high-concentration FAD of soybean oil enters the soybean oil high-concentration FAD temporary storage tank 6.1, and the rapeseed oil enters the rapeseed oil high-concentration FAD temporary storage tank 6.2) until the liquid level drops to M.

[0058] In a specific embodiment of the present invention, the high-concentration FAD in the high-concentration FAD tank 4 flows back to the decolorized oil temporary storage tank 8. Preferably, the reflux flow rate is controlled at 0 - 60 kg / h.

[0059] The two-stage capture and reflux automatic control system for vegetable oil deodorization provided by the present invention can be used for oil deodorization treatment. Specifically, the decolorized oil flowing out of the decolorized oil temporary storage tank 8 and the deodorized oil obtained by processing in the deodorization tower 1 are heat-exchanged through heat exchanger C12 (after passing through heat exchanger C12, the deodorized oil becomes deodorized vegetable oil). The decolorized oil after heat exchange treatment is heated by heater 9 and then enters the deodorization tower 1 for deodorization treatment to prepare deodorized oil, while the deodorized distillate enters the high-temperature capture tower 2 and the low-temperature capture tower 3 in sequence. The obtained high-temperature capture product (i.e., high-concentration FAD) enters the high-concentration FAD tank 4. The high-concentration FAD in the high-concentration FAD tank 4 enters the high-concentration FAD temporary storage tank 6, the decolorized oil temporary storage tank 8, and / or returns to the high-temperature capture tower 2 according to requirements; the obtained low-temperature capture product (i.e., low-concentration FAD) enters the low-concentration FAD tank 5. The low-concentration FAD in the low-concentration FAD tank 5 enters the low-concentration FAD temporary storage tank 7 and / or returns to the low-temperature capture tower 3 according to requirements.

[0060] Among them, the vegetable oil is one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower oil, cottonseed oil, olive oil, hydrogenated oil, palm oil, and more preferably one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, and linseed oil;

[0061] By using the two-stage trapping and reflux automatic control system for vegetable oil deodorization of the present invention, the retention rates of VE and sterols can be effectively increased to over 90%, and there is no significant impact on the quality of deodorized oil, especially the conventional indexes (acid value, color).

[0062] The present invention also provides a method for deodorizing vegetable oil.

[0063] The method for deodorizing vegetable oil provided by the present invention includes preparation using the aforementioned two-stage trapping and reflux automatic control system for vegetable oil deodorization.

[0064] The present invention also provides a method for producing vegetable oil.

[0065] The method provided by the present invention includes the step of deodorizing the bleached oil through the aforementioned two-stage trapping and reflux automatic control system for vegetable oil deodorization. Optionally, the method further includes one or more steps of degumming, deacidification, bleaching, and dewaxing.

[0066] In the present invention, the vegetable oil can be one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower oil, cottonseed oil, olive oil, hydrogenated oil, palm oil, and is preferably one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, and linseed oil.

[0067] The present invention also provides a method for producing blended oil, which is characterized in that the method includes

[0068] A) The step of preparing vegetable oil by using the aforementioned method for producing vegetable oil, and

[0069] B) The step of blending the degreased oil prepared in step A with other oils; the other oils include animal oil or vegetable oil.

[0070] In the present invention, the vegetable oil can be one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower oil, cottonseed oil, olive oil, hydrogenated oil, palm oil, and is preferably one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, and linseed oil; the animal oil is preferably one or more selected from lard, beef tallow, mutton tallow, and fish oil.

[0071] The present invention will be described below by way of specific embodiments. It should be understood that these embodiments are merely illustrative and do not limit the scope of protection of the present invention.

[0072] In the following embodiments of the present invention, the detection method is as follows:

[0073] VE retention rate: The VE analysis method refers to "National Food Safety Standard Determination of Vitamin A, D, and E in Foods GB 5009.82-2016". VE retention rate = VE content in deodorized oil / VE content in crude oil 。

[0074] Sterol retention rate: The sterol analysis method refers to "Determination of Sterol Composition and Total Sterols in Animal and Vegetable Oils and Fats - Gas Chromatography GB / T 25223-2010". Sterol retention rate = sterol content in deodorized oil / sterol content in crude oil 。

[0075] Acid value: National Food Safety Standard Determination of Acid Value in Foods GB 5009 / 229-2016.

[0076] Color: Determination of Lovibond Color of Animal and Vegetable Oils and Fats GB / T 22460-2008.

[0077] In the following embodiments of the present invention, the automatic control system for two-stage trapping and reflux of vegetable oil deodorization is as Figure 1 shown and includes:

[0078] Deodorization tower 1, two-stage trapping tower 19 (including high-temperature trapping tower 2 and low-temperature trapping tower 3), high-concentration FAD tank 4, low-concentration FAD tank 5, high-concentration FAD temporary storage tank 6 (including soybean oil high-concentration FAD temporary storage tank 6.1, rapeseed oil high-concentration FAD temporary storage tank 6.2, corn oil high-concentration FAD temporary storage tank 6.3, and sunflower oil high-concentration FAD temporary storage tank 6.4), low-concentration FAD temporary storage tank 7, decolorized oil temporary storage tank 8, heater 9, heat exchanger A 10, heat exchanger B 11, heat exchanger C 12, pump A 13, pump B 14, pump C 15, pump D 16, pump E 17, flowmeter 18, vacuum system 20.

[0079] Example 1: The oil processed is soybean oil.

[0080] Before the deodorization starts, first empty the high-concentration FAD of other oil types in the high-concentration FAD tank 4. Specifically, pump it to the soybean oil high-concentration FAD temporary storage tank 6.1 by pump B14; when the decolorized oil temporary storage tank 8 starts to receive decolorized soybean oil, pump B14 and the corresponding upper valve are in the closed state, open pump C15 and the lower valve of the soybean oil temporary storage tank, and pump the soybean oil high-concentration FAD in the soybean oil high-concentration FAD temporary storage tank 6.1 back to the high-concentration FAD tank 4 to the medium reporting position M by pump C15. Then immediately close pump C15 and the lower valve, open pump B14 and the reflux valve, and start the reflux of soybean oil high-concentration FAD, refluxing to the decolorized oil temporary storage tank 8, with a reflux flow rate of 40 kg / h; the oil in the decolorized oil temporary storage tank 8 is pumped by pump D16, flows through the heat exchanger C12 to exchange heat with the deodorized oil, and then is heated to the deodorization temperature of 250 °C by the heater 9 and enters the deodorization tower 1 to start deodorization. Subsequently, the deodorized distillate is trapped by the high-temperature trapping tower 2 and the low-temperature trapping tower 3 in sequence. The obtained high-temperature distillate (high-concentration FAD) enters the high-concentration FAD tank 4, and after being exchanged and cooled to 140 °C by pump B14 and the heat exchanger B11, it is spray-cooled at the high-temperature trapping tower 2. When the high-concentration FAD reaches the high reporting position H, pump the high-concentration FAD into the soybean oil high-concentration FAD temporary storage tank 6.1 until the liquid level drops to M; the low-temperature distillate (low-concentration FAD) enters the low-concentration FAD tank 5. The obtained low-temperature distillate (low-concentration FAD) enters the low-concentration FAD tank 5, and after being exchanged and cooled to 50 °C by pump A13 and the heat exchanger A10, it is spray-cooled at the low-temperature trapping tower 3. When the low-concentration FAD tank 5 is at high level, pump the low-concentration FAD into the low-concentration FAD temporary storage tank 7. After the deodorized oil exchanges heat with the decolorized oil, deodorized oil is obtained.

[0081] Comparative Example 1:

[0082] The processed oil type is soybean oil.

[0083] The decolorized oil enters the temporary storage tank. The oil in the decolorized oil temporary storage tank 8 is pumped by pump D16, flows through the heat exchanger C12 to exchange heat with the deodorized oil, and then is heated to the deodorization temperature of 250 °C by the heater 9 and enters the deodorization tower 1 to start deodorization. Subsequently, the deodorized distillate is trapped by the high-temperature trapping tower 2 and the low-temperature trapping tower 3 in sequence. The obtained high-temperature distillate (high-concentration FAD) enters the high-concentration FAD tank 4, and after being exchanged and cooled to 140 °C by pump B14 and the heat exchanger B11, it is spray-cooled at the high-temperature trapping tower 2. When the high-concentration FAD reaches the high reporting position H, pump the high-concentration FAD into the soybean oil high-concentration FAD temporary storage tank 6.1 until the liquid level drops to M; the low-temperature distillate (low-concentration FAD) enters the low-concentration FAD tank 5. The obtained low-temperature distillate (low-concentration FAD) enters the low-concentration FAD tank 5, and after being exchanged and cooled to 50 °C by pump A13 and the heat exchanger A10, it is spray-cooled at the low-temperature trapping tower 3. When the low-concentration FAD tank 5 is at high level, pump the low-concentration FAD into the low-concentration FAD temporary storage tank 7. After the deodorized oil exchanges heat with the decolorized oil, deodorized oil is obtained.

[0084] The results showed that, compared with Comparative Example 1, the retention rates of VE and sterol in Example 1 were increased by 12.23% and 11.78% respectively, and the retention rates of VE and sterol were increased to 94.38% and 97.24% respectively. Compared with Comparative Example 1, the acid value and color were 0.08 mgKOH / g and 0.8R (133.4 mm) respectively, and the reflux operation had no significant effect on the conventional indexes of the oil.

[0085] For Examples 2 - 6, the implementation steps refer to Example 1, and for Comparative Examples 2 - 6, the implementation steps refer to Comparative Example 1. Among them, Example 2 is compared with Comparative Example 2, Example 3 is compared with Comparative Example 3, Example 4 is compared with Comparative Example 4, Example 5 is compared with Comparative Example 5, and Example 6 is compared with Comparative Example 6. Reflux can significantly increase the retention rates of VE and sterol to over 90% without affecting the conventional indexes of the oil.

[0086] Comparative Example 7:

[0087] The oil type to be processed is soybean oil.

[0088] Before the start of deodorization, first empty the high - concentration FAD of other oil types in the high - concentration FAD tank 4. Specifically, pump it from Pump B B14 to the soybean oil high - concentration FAD temporary storage tank 6.1; when the decolorized oil temporary storage tank 8 starts to receive decolorized soybean oil, Pump B14 and the corresponding upper valve are in the closed state, pump the deodorized soybean oil back to the high - concentration FAD tank 4 to the medium - reported position M, then immediately open Pump B14 and the reflux valve to start the soybean oil high - concentration FAD reflux, refluxing to the decolorized oil temporary storage tank 8, with a reflux rate of 40 kg / h; the oil in the decolorized oil temporary storage tank 8 passes through Pump D16, flows through the heat exchanger C12 to exchange heat with the deodorized oil, and then is heated to the deodorization temperature of 250 °C by the heater 9 and enters the deodorization tower 1 to start deodorization. Subsequently, the deodorized distillate is trapped by the high - temperature trap tower 2 and the low - temperature trap tower 3 successively. The obtained high - temperature distillate (high - concentration FAD) enters the high - concentration FAD tank 4, and after being exchanged heat and cooled to 140 °C by Pump B14 and the heat exchanger B11, it is spray - cooled at the high - temperature trap tower 2. When the high - concentration FAD reaches the high - reported position H, pump the high - concentration FAD into the soybean oil high - concentration FAD temporary storage tank 6.1 until the liquid level drops to M; the low - temperature distillate (low - concentration FAD) enters the low - concentration FAD tank 5. The obtained low - temperature distillate (low - concentration FAD) enters the low - concentration FAD tank 5, and after being exchanged heat and cooled to 50 °C by Pump A13 and the heat exchanger A10, it is spray - cooled at the low - temperature trap tower 3. When the low - concentration FAD tank 5 is at the high - reported level, pump the low - concentration FAD into the low - concentration FAD temporary storage tank 7. After the deodorized oil exchanges heat with the decolorized oil, deodorized oil is obtained.

[0089] Comparative Example 8:

[0090] The oil type to be processed is soybean oil.

[0091] Before the deodorization starts, first empty the high-concentration FAD of other oil types in the high-concentration FAD tank 4. Specifically, pump it to the soybean oil high-concentration FAD temporary storage tank 6.1 by pump B14; when the decolorized oil temporary storage tank 8 starts to receive decolorized soybean oil, close the upper and lower valves of the soybean oil high-concentration FAD temporary storage tank 6.1; the oil in the decolorized oil temporary storage tank 8 flows through pump D16, exchanges heat with the deodorized oil in heat exchanger C12, and then is heated to the deodorization temperature of 250 °C by heater 9 and enters the deodorization tower 1 to start deodorization. Subsequently, the deodorized distillate is trapped by the high-temperature trap tower 2 and the low-temperature trap tower 3 in sequence. The obtained high-temperature distillate (high-concentration FAD) enters the high-concentration FAD tank 4, and after being exchanged and cooled to 140 °C by pump B14 and heat exchanger B11, it is spray-cooled at the high-temperature trap tower 2. When the high-concentration FAD in the soybean oil high-concentration FAD temporary storage tank 6.1 reaches the high alarm level H, it is directly transported to the penultimate layer of the deodorization tower 1 through a pipeline; the low-temperature distillate (low-concentration FAD) enters the low-concentration FAD tank 5. The obtained low-temperature distillate (low-concentration FAD) enters the low-concentration FAD tank 5, and after being exchanged and cooled to 50 °C by pump A13 and heat exchanger A10, it is spray-cooled at the low-temperature trap tower 3. When the low-concentration FAD tank 5 is at high alarm, pump the low-concentration FAD into the low-concentration FAD temporary storage tank 7. After the deodorized oil exchanges heat with the decolorized oil, deodorized oil is obtained.

[0092] Detect the VE and sterol contents of the deodorized oil and crude oil, determine the VE and sterol retention rates, and measure the acid value and color of the deodorized oil.

[0093] Comparing Example 1 with Comparative Example 7, compared with refluxing high-concentration FAD and refluxing refined oil, refluxing high-concentration FAD can significantly improve the VE and sterol retention rates.

[0094] Comparing Example 1 with Comparative Example 8, although Comparative Example 8 can also significantly improve the VE and sterol retention rates, it has a great impact on the conventional indexes AV and color of the deodorized oil, which is not conducive to the quality control of the factory.

[0095] The main parameters and results are shown in Table 1 below.

[0096] Table 1 Examples and Comparative Examples

[0097]

[0098] Table 1 results show that by using the method of the present invention, the production automation of the two-stage trapping and reflux process for vegetable oil deodorization can be solved, and the reflux amount and the VE and sterol retention rates of the final product can be accurately controlled. The VE and sterol retention rates can both be effectively increased to more than 90%, and there is no significant impact on the quality of the deodorized oil, especially the conventional indexes (AV, color).

Claims

1. An automated control system for two-stage trapping and reflux of vegetable oil deodorization, which includes a deodorization tower (1), a two-stage trapping tower (19), a high-concentration FAD tank (4), a low-concentration FAD tank (5), a decolorized oil temporary storage tank (8), a heat exchanger A (10), a heat exchanger B (11), a heat exchanger C (12), a heater (9), and a vacuum system (20). Among them, The decolorized oil temporary storage tank (8) is connected to the deodorization tower (1) through the heat exchanger C (12) and the heater (9) to add the decolorized oil to the upper part of the deodorization tower (1). The deodorization tower (1) is connected to the two-stage capture tower (19) to capture the fatty acid distillate distilled from the deodorization tower (1). The two-stage capture tower (19) includes a high-temperature capture tower (2) and a low-temperature capture tower (3), and the fatty acid distillate passes through the high-temperature capture tower (2) and the low-temperature capture tower (3) in sequence. The high-temperature capture tower (2) is connected to the high-concentration FAD tank (4), and the high-concentration FAD tank (4) is connected to the high-temperature capture tower (2) again through the heat exchanger B (11), forming a high-concentration FAD circulating capture system that returns from the high-temperature capture tower (2) through the high-concentration FAD tank (4) to the high-temperature capture tower (2). The low-temperature capture tower (3) is connected to the low-concentration FAD tank (5), and the low-concentration FAD tank (5) is connected to the low-temperature capture tower (3) again through the heat exchanger A (10), forming a low-concentration FAD circulating capture system that returns from the low-temperature capture tower (3) through the low-concentration FAD tank (5) to the low-temperature capture tower (3). The high-concentration FAD tank (4) is also connected to the decolorized oil temporary storage tank (8) to return the high-concentration FAD to the decolorized oil temporary storage tank (8). The vacuum system (20) is connected to the deodorization tower (1) and the two-stage capture tower (19) respectively. The high-concentration FAD tank (4) is also connected to the high-concentration FAD temporary storage tank (6) to control the amount of high-concentration FAD in the high-concentration FAD tank (4). The high-concentration FAD refers to the fatty acid deodorization distillate with a high VE content, and the low-concentration FAD refers to the fatty acid deodorization distillate with a low VE content.

2. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 1, characterized in that The high-concentration FAD tank (4) and the high-concentration FAD temporary storage tank (6) are connected bidirectionally.

3. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 1, characterized in that The high-concentration FAD temporary storage tank (6) is provided with one or more temporary storage tanks.

4. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 3, characterized in that The high-concentration FAD temporary storage tank (6) includes a soybean oil high-concentration FAD temporary storage tank (6.1), a rapeseed oil high-concentration FAD temporary storage tank (6.2), a corn oil high-concentration FAD temporary storage tank (6.3), and / or a sunflower oil high-concentration FAD temporary storage tank (6.4).

5. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 1, characterized in that The low-concentration FAD tank (5) is connected to the low-concentration FAD temporary storage tank (7) to control the amount of low-concentration FAD in the low-concentration FAD tank (5).

6. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 1, characterized in that The deodorization tower (1) includes a plate tower or a packed tower or a combination of the plate tower and the packed tower.

7. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 1, characterized in that The two-stage capture tower (19) is of a packed structure. Among them, the high-temperature capture temperature range of the high-temperature capture tower (2) is 130 - 160 °C, and the low-temperature capture range of the low-temperature capture tower (3) is 40 - 100 °C.

8. The automated control system for two-stage trapping and reflux of vegetable oil deodorization according to claim 1, characterized in that The automated control system is controlled by a central control system.

9. A method for vegetable oil deodorization, which is prepared by using the automated control system for two-stage trapping and reflux of vegetable oil deodorization according to any one of claims 1-8.

10. A method for producing vegetable oil, characterized in that The method includes the step of deodorizing the decolorized oil through the automated control system for two-stage capture and reflux of vegetable oil deodorization according to any one of claims 1 - 8.

11. The method according to claim 10, characterized in that The method further includes one or more steps of degumming, deacidification, decolorization, and dewaxing.

12. The method according to claim 10, characterized in that The vegetable oil is one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower oil, cottonseed oil, olive oil, hydrogenated oil, and palm oil.

13. A method for producing blended oil, characterized in that The method includes: A) a step of preparing vegetable oil by using the method for producing vegetable oil according to any one of claims 10-12, and B) a step of blending the vegetable oil prepared in step A with other oils and fats; the other oils and fats include animal oil or vegetable oil not prepared by using step A.

14. The method according to claim 13, wherein The vegetable oil not prepared by using step A is one or more of soybean oil, rapeseed oil, corn oil, sunflower oil, rice bran oil, linseed oil, peanut oil, sesame oil, tea oil, wheat germ oil, walnut oil, coconut oil, safflower oil, cottonseed oil, olive oil, hydrogenated oil, and palm oil.

15. The method according to claim 13, wherein The animal oil is one or more of lard, beef tallow, mutton tallow, and fish oil.

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