Ve fraction capture double system of physical refining device for vegetable oil

Abstract

The utility model discloses a kind of VE grading capture double systems of vegetable oil physical refining device, including a set of low VE capture system consisting of front stripping deodorization tower, low VE fatty acid trap and low VE fatty acid circulating pump;Another set of high VE capture system consisting of high-pressure heater, rear stripping deodorization tower, high VE fatty acid trap and high VE fatty acid circulating pump.The low-temperature section shell side outlet of falling-film heat exchanger is connected in proper order front stripping deodorization tower, deodorization tower and deodorization oil delivery pump to constitute loop connection;The high-temperature section shell side outlet of falling-film heat exchanger is connected in proper order high-pressure heater and rear stripping deodorization tower to constitute loop connection.Low VE capture system and high VE supplement system are connected with same vacuum system.The VE grading capture double system can be used in vegetable oil physical refining device deodorization process, capture low VE fatty acid and high VE fatty acid in fatty acid distillate.Avoid all fatty acid distillate through high-temperature rectification to obtain high VE fatty acid, cause a lot of VE heat loss.

Description

Technical Field

[0001] This utility model relates to the field of vegetable oil processing, specifically to a dual-system for VE grading and collection in a physical refining apparatus for vegetable oils. It is suitable for reducing the heat loss of VE during the physical refining process of vegetable oils, so as to obtain more high-value by-products. Background Technology

[0002] Vegetable oils can be refined using either chemical or physical methods. Chemical refining includes degumming, neutralization, dewaxing and winterization, bleaching, and deodorization. Physical refining includes degumming, bleaching, and deodorization. Deodorization is a crucial step in oil refining, and fatty acid distillates are byproducts of this process. Their main components include free fatty acids, vitamin E, phytosterols, neutral oils, and other substances.

[0003] Vitamin E (VE) possesses strong antioxidant activity and also exhibits physiological functions such as protecting biological membranes, delaying aging, enhancing immunity and fighting cancer, maintaining the normal function of the cardiovascular and nervous systems, and enhancing reproductive capacity. Phytosterols regulate blood lipids and reduce cholesterol absorption. Currently, the market price of phytosterols is lower than that of vitamin E; therefore, the price of fatty acid distillates mainly depends on their vitamin E content. It is understood that for every 1% increase in vitamin E content in fatty acid distillates, the price increases by several thousand yuan per ton.

[0004] In recent years, the increased demand for vitamin E in both domestic and international markets has led to a rise in the price of fatty acid distillates. Extracting high-content vitamin E from fatty acid distillates has become a research hotspot in recent years.

[0005] The vitamin E (VE) content in fatty acid distillates is related to the type of oil, the quality of the oilseeds, and the refining method. Crude soybean oil has a significantly higher VE content than other crude vegetable oils. In chemical refining, because the crude oil undergoes acid-base neutralization, most of the free fatty acids are removed, resulting in a higher VE content in the fatty acid distillate, typically between 4% and 8%. In physical refining, the fatty acid distillate contains over 90% free fatty acids, with a VE content of only 1% to 4%, leading to lower economic value. While traditional high-temperature fractionation increases the VE content in fatty acid distillates, the high temperatures result in significant VE loss, limiting the economic benefits of the byproduct fatty acid distillate. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to provide a dual system for graded collection of vitamin E that can increase the vitamin E content of by-product fatty acid distillate, reduce the heat loss of vitamin E, and has low investment and simple structure.

[0007] The technical solution of this utility model is a dual system for VE graded collection in a physical refining device for vegetable oil. The system is equipped with a falling film heat exchanger, which is divided into a low-temperature section and a high-temperature section.

[0008] The shell-side inlet of the low-temperature section of the falling film heat exchanger is connected to a decolorizing oil pipeline, and the shell-side outlet of the low-temperature section is connected to a distributor at the top of the front stripping deodorization tower. The bottom of the front stripping deodorization tower is connected in sequence to a deodorization tower and a deodorizing oil transfer pump. The other end of the deodorizing oil transfer pump is connected to the shell-side inlet of the high-temperature section of the falling film heat exchanger, forming a loop connection.

[0009] The high-temperature shell-side outlet of the falling film heat exchanger is sequentially connected to a high-pressure heater and a post-stripping deodorization tower. The outlet of the post-stripping deodorization tower is connected to the tube-side inlet of the falling film heat exchanger, forming a loop connection. The tube-side outlet of the falling film heat exchanger is connected to an RBD oil pipeline.

[0010] The gas phase outlet of the pre-stripping deodorization tower is connected to a low-VE fatty acid trap; the top of the low-VE fatty acid trap is connected to a vacuum system.

[0011] The gas phase outlets of the falling film heat exchanger, the deodorization tower, the high-pressure heater, and the post-stripping deodorization tower are respectively connected to a high-VE fatty acid trap; the top of the high-VE fatty acid trap is connected to a vacuum system.

[0012] The front stripping deodorization tower and the rear stripping deodorization tower are respectively connected to stripping steam pipelines for direct stripping of deodorized oil. That is, high-temperature steam is used to transfer free fatty acids and components such as vitamin E in the oil from the liquid phase to the gas phase and separate them from the oil.

[0013] The front stripping deodorization tower operates at a low stripping temperature, thus removing most of the free fatty acids, while retaining a small amount of vitamin E with a higher boiling point. The rear stripping deodorization tower operates at a high stripping temperature, removing a large amount of free fatty acids under the same vacuum conditions, but with a significantly higher vitamin E content. The market price of fatty acid distillates mainly depends on their vitamin E content.

[0014] The high-pressure heater is connected to a high-pressure steam pipe and a high-pressure condensate pipe.

[0015] Furthermore, the low-VE fatty acid trap and the low-VE fatty acid circulation pump are connected in a circulation loop via pipelines. The low-VE fatty acid trap is connected to the bottom of the low-VE fatty acid circulation pump.

[0016] Furthermore, the high-VE fatty acid trap and the high-VE fatty acid circulation pump are connected in a circulation loop via pipelines. The high-VE fatty acid trap is connected to the bottom of the high-VE fatty acid circulation pump.

[0017] Furthermore, the low-VE fatty acid circulation pump is connected to a low-VE fatty acid storage tank or a VE fractionation system via pipelines.

[0018] Depending on the user's choice, either option can be connected. Choosing the VE fractionation system can further extract the VE content from concentrated fatty acid distillates, creating additional economic benefits. Choosing the low-VE storage tank is equivalent to direct sale, as its VE content is low and its market price is also lower.

[0019] Furthermore, the high-VE fatty acid circulation pump is connected to a high-VE fatty acid storage tank via a pipeline.

[0020] The beneficial effects of this utility model are:

[0021] This utility model relates to a dual-system for graded vitamin E collection, applicable to physical refining apparatuses for vegetable oils. The dual-system for graded vitamin E collection in this physical refining apparatus for vegetable oils includes a low-vitamin E collection system consisting of a front stripping deodorization tower, a low-vitamin E fatty acid trap, and a low-vitamin E fatty acid circulation pump; and a high-vitamin E collection system consisting of a high-pressure heater, a rear stripping deodorization tower, a high-vitamin E fatty acid trap, and a high-vitamin E fatty acid circulation pump. The low-vitamin E collection system and the high-vitamin E collection system are connected to the same vacuum system.

[0022] Through the above operations, the dual-system VE fractionation and collection system of the physical refining apparatus for vegetable oil provided by this utility model can be realized, which can increase the VE content of most of the fatty acid distillate from 1% to 4% to 8% to 15%, and this part of the high-VE fatty acid distillate does not need to be fractionated again. Compared with the traditional high-temperature fractionation method for VE purification, the heat loss of VE is as high as about 10%, while this system does not cause heat loss of VE.

[0023] The present invention provides a dual-system for VE grading and collection in a physical refining apparatus for vegetable oil, which not only yields higher returns but also involves fewer devices and has lower operating and investment costs, thereby creating greater economic benefits. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a dual-system VE grading and collection device for a physical refining apparatus for vegetable oil.

[0025] In the diagram, 1 is a falling film heat exchanger; 2 is a deodorization tower; 3 is a deodorized oil transfer pump; 4 is a front stripping deodorization tower; 5 is a low-VE fatty acid trap; 6 is a low-VE fatty acid circulation pump; 7 is a high-pressure heater; 8 is a rear stripping deodorization tower; 9 is a high-VE fatty acid trap; and 10 is a high-VE fatty acid circulation pump. Detailed Implementation

[0026] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] The following is combined Figure 1 The present invention provides a more detailed description of a specific embodiment of a dual-system for VE grading and collection in a physical refining apparatus for vegetable oil.

[0030] like Figure 1 As shown, the specific connection method of the VE grading and collection dual system of the vegetable oil physical refining device of this utility model is as follows:

[0031] The shell-side inlet of the low-temperature section of the falling film heat exchanger 1 is connected to a decolorizing oil pipeline, and the shell-side outlet of the low-temperature section is connected to a distributor at the top of the front stripping deodorization tower 4. The discharge port at the bottom of the front stripping deodorization tower 4 is connected in sequence to the deodorization tower 2 and the deodorizing oil transfer pump 3. The outlet of the deodorizing oil transfer pump 3 is connected to the shell-side inlet of the high-temperature section of the falling film heat exchanger 1, forming a loop connection.

[0032] The high-temperature section shell-side outlet of the falling film heat exchanger 1 is sequentially connected to a high-pressure heater 7 and a post-stripping deodorization tower 8; the discharge port at the bottom of the post-stripping deodorization tower 8 is connected to the tube-side inlet of the falling film heat exchanger 1, forming a loop connection. The tube-side outlet of the falling film heat exchanger 1 is connected to an RBD oil pipeline.

[0033] The gas phase outlet at the top of the front stripping deodorization tower 4 is connected to the low VE fatty acid trap 5 via a pipeline; the top of the low VE fatty acid trap 5 is connected to a vacuum system.

[0034] The falling film heat exchanger 1, deodorization tower 2, high-pressure heater 7, and post-stripping deodorization tower 8 are connected to the gas phase outlets of the above four devices via pipelines to the high VE fatty acid trap 9; the top of the high VE fatty acid trap 9 is connected to a vacuum system.

[0035] The bottom of the front stripping deodorization tower 4 and the bottom of the rear stripping deodorization tower 8 are respectively connected to stripping steam pipes.

[0036] The high-pressure heater 7 is connected to a high-pressure steam pipe and a high-pressure condensate pipe.

[0037] The outlet of the low-VE fatty acid trap 5 is connected to the inlet of the low-VE fatty acid circulation pump 6, and the outlet of the low-VE fatty acid circulation pump 6 is connected to the nozzle at the top of the low-VE fatty acid trap 5 through a pipe, forming a circulation loop connection.

[0038] The outlet of the high VE fatty acid trap 9 is connected to the inlet of the high VE fatty acid circulation pump 10, and the outlet of the high VE fatty acid circulation pump 10 is connected to the nozzle at the top of the high VE fatty acid trap 9 through a pipe, forming a circulation loop connection.

[0039] The low-VE fatty acid circulation pump 6 is connected to the low-VE fatty acid storage tank and the VE fractionation system via pipelines. For example, the VE fractionation system involved in the patent ZL 2024 2 0272269.4, entitled "VE Fractionation Unit of Fatty Acid Distillate in Edible Oil Refining Device", is adopted.

[0040] The high-VE fatty acid circulation pump 10 is connected to a high-VE fatty acid storage tank via a pipeline.

[0041] The process flow of the dual-system VE grading and collection system in the physical refining device for vegetable oil of this utility model is as follows:

[0042] The low-VE fatty acid trap 5 and the high-VE fatty acid trap 9 are connected to the same vacuum system, with a vacuum level of 0.8 mbar to 1.5 mbar. The gas phase outlet of the front stripping deodorization tower 4 is connected to the low-VE fatty acid trap 5; the gas phase outlets of the falling film heat exchanger 1, deodorization tower 2, high-pressure heater 7, and rear stripping deodorization tower 8 are all connected to the high-VE fatty acid trap 9. Therefore, both low-VE fatty acid trapping and high-VE fatty acid trapping are carried out under high vacuum conditions.

[0043] First, the decolorized oil from the decolorization unit enters the shell side of the low-temperature section of the falling film heat exchanger 1, where it is heated to 230–240°C. Then, it enters the pre-stripping deodorization tower 4, where it undergoes stripping and agitation to remove a large amount of free fatty acids, a small amount of vitamin E, and some odor components. It then enters the deodorization tower 2 for further removal of unpleasant odor substances. The deodorized oil exits from the bottom of the deodorization tower 2 and is pumped by the deodorized oil transfer pump 3 to the shell side of the high-temperature section of the falling film heat exchanger 1. There, it exchanges heat with the high-temperature deodorized oil to 240–250°C, and then is heated to 260–270°C by the high-pressure heater 4 before entering the post-stripping deodorization tower 8 for stripping. At this point, the fatty acid distillate removed contains a large amount of vitamin E. Finally, the high-temperature deodorized oil exits from the bottom of the post-stripping deodorization tower 8 and returns to the tube side of the falling film heat exchanger 1 as a heat source. After two stages of heat exchange, a lower-temperature RBD oil is obtained.

[0044] The fatty acid distillate removed by the pre-stripping deodorization tower 4 is collected in the low-VE fatty acid trap 5. When the low-VE fatty acid trap 5 has not reached the high level, the low-VE fatty acid circulation pump 6 circulates the collection. When the low-VE fatty acid trap 5 reaches the high level, the low-VE fatty acid distillate (VE≤1%) will be transported by the low-VE fatty acid circulation pump 6 to the low-VE fatty acid storage tank or to the VE fractionation system for further VE purification.

[0045] The fatty acid distillate removed by the post-stripping deodorization tower 8 is collected in the high VE fatty acid collector 9. When the high VE fatty acid collector 9 has not reached the high level, the high VE fatty acid circulation pump 10 circulates and collects the distillate. When the high VE fatty acid collector 9 reaches the high level, the high VE fatty acid distillate (8% ≤ VE ≤ 15%) will be transported to the high VE fatty acid storage tank through the high VE fatty acid circulation pump 10.

[0046] Through the above operations, the dual-system VE grading and collection of the physical refining apparatus for vegetable oil provided by this utility model can be realized. The dual-system VE grading and collection of the physical refining apparatus for vegetable oil provided by this utility model also has the following advantages:

[0047] (1) The boiling point of fatty acids is lower than that of vitamin E. Before the deodorization process of vegetable oil, a low-vitamin fatty acid capture system is installed. At a lower operating temperature, a large amount of free fatty acids and other low-boiling-point components are removed, ensuring the vacuum level of subsequent processes and significantly improving the efficiency of post-deacidification. In addition, a better vacuum level means a lower temperature, which not only saves the amount of steam used, but also avoids the formation of trans fatty acids in the oil due to prolonged high temperature.

[0048] (2) The dual-system VE fractionation and collection of this utility model can obtain two types of byproducts. One is a high-VE fatty acid distillate (8% ≤ VE ≤ 15%), which, due to its high VE content, meets market demand and can be used as a high-value byproduct—VE raw material. The other is a low-VE fatty acid distillate (VE ≤ 1%), which, due to its low VE content, can be used as a low-value byproduct—fatty acid distillate, or further purified by the VE fractionation system.

[0049] (3) Compared to the method of fractionating all fatty acid distillates produced in the deodorization process with vitamin E, which results in a heat loss of approximately 10% for vitamin E, this invention allows for the selective fractionation of vitamin E only for low-vitamin fatty acid distillates. This reduces the amount of fatty acid distillate fractionated, significantly lowering steam and electricity consumption; the heat loss of vitamin E is also reduced to approximately 1%. This invention maximizes the value of by-products while conserving energy resources.

[0050] (4) The present invention involves fewer devices and has lower operating and investment costs, thereby creating higher economic benefits.

Claims

1. A dual-system for VE grading and collection in a physical refining apparatus for vegetable oil, characterized in that, The system is equipped with a falling film heat exchanger (1), which is divided into a low temperature section and a high temperature section; The shell-side inlet of the low-temperature section of the falling film heat exchanger (1) is connected to a decolorizing oil pipeline, and the shell-side outlet of the low-temperature section is connected to a distributor at the top of the front stripping deodorization tower (4). The bottom of the front stripping deodorization tower (4) is connected in sequence to a deodorization tower (2) and a deodorizing oil transfer pump (3). The other end of the deodorizing oil transfer pump (3) is connected to the shell-side inlet of the high-temperature section of the falling film heat exchanger (1), forming a loop connection. The high-temperature shell-side outlet of the falling film heat exchanger (1) is sequentially connected to a high-pressure heater (7) and a post-stripping deodorization tower (8). The outlet of the post-stripping deodorization tower (8) is connected to the tube-side inlet of the falling film heat exchanger (1), forming a loop connection. The tube-side outlet of the falling film heat exchanger (1) is connected to an RBD oil pipeline.

2. The dual-system VE grading and collection system of a vegetable oil physical refining apparatus according to claim 1, characterized in that: The gas phase outlet of the pre-stripping deodorization tower (4) is connected to the low-VE fatty acid trap (5); the top of the low-VE fatty acid trap (5) is connected to a vacuum system.

3. The dual-system for VE grading and collection in a physical refining apparatus for vegetable oil according to claim 1, characterized in that: The gas phase outlets of the falling film heat exchanger (1), the deodorization tower (2), the high-pressure heater (7), and the post-stripping deodorization tower (8) are respectively connected to the high VE fatty acid trap (9); the top of the high VE fatty acid trap (9) is connected to a vacuum system.

4. The dual-system for VE grading and collection in a physical refining apparatus for vegetable oil according to claim 1, characterized in that: The front stripping deodorization tower (4) is connected to a stripping steam pipeline; the rear stripping deodorization tower (8) is connected to a stripping steam pipeline.

5. The dual-system for VE grading and collection in a physical refining apparatus for vegetable oil according to claim 1, characterized in that: The high-pressure heater (7) is connected to a high-pressure steam pipe and a high-pressure condensate pipe.

6. The dual-system for VE grading and collection in a physical refining apparatus for vegetable oil according to claim 2, characterized in that: The low-VE fatty acid trap (5) and the low-VE fatty acid circulation pump (6) are connected in a circulation loop through a pipeline.

7. The dual-system for VE grading and collection in a physical refining apparatus for vegetable oil according to claim 3, characterized in that: The high-VE fatty acid trap (9) and the high-VE fatty acid circulation pump (10) are connected in a circulation loop through a pipeline.

8. The dual-system VE grading and collection system of a vegetable oil physical refining apparatus according to claim 2, characterized in that: The low-VE fatty acid circulation pump (6) is connected to a low-VE fatty acid storage tank or a VE fractionation system via pipelines.

9. The dual-system for VE grading and collection in a physical refining apparatus for vegetable oil according to claim 7, characterized in that: The high-VE fatty acid circulation pump (10) is connected to a high-VE fatty acid storage tank via a pipeline.

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