Mixed oil dewaxing device and dewaxing method for rice bran oil

Abstract

The invention discloses a rice bran oil mixed oil dewaxing device and dewaxing method, and belongs to the field of grease processing, the rice bran oil mixed oil dewaxing device comprises a wax crystallization system, a filtering system and a wax purification system which are connected in sequence, all the systems and all the systems are connected through pipelines, and a plurality of conveying pumps for conveying media are arranged; the wax crystallization system comprises a crystallizer and a refrigerant tank for cooling the crystallizer, the filtering system comprises a horizontal blade type filter, and the wax purification system comprises an evaporation system for evaporating and recycling wax. Through the steps of pretreatment, crystallization, separation and filtration, efficient and automatic dewaxing, colloid separation, waxy solvent recovery and the like of the rice bran oil are achieved, the production efficiency is remarkably improved, the production cost is reduced, and the quality of finished oil is improved. According to the dewaxing device and the dewaxing method, the dewaxing efficiency is improved, the labor intensity and the production cost are reduced, the purity and the stability of the rice bran oil are also improved, and the dewaxing device and the dewaxing method have remarkable industrial application value and market prospect.

Description

Technical Field

[0001] The invention relates to the technical field of deep processing of oils and fats, in particular to the design and manufacturing field involved in a mixed oil dewaxing device of rice bran oil and a preparation method thereof. Background Art

[0002] Rice bran oil is a kind of edible oil with high nutritional value. It is rich in linoleic acid. Regular consumption can reduce the cholesterol content in the human body and is beneficial to the prevention and treatment of cardiovascular diseases. The chemical refining process of rice bran oil is: crude rice bran oil → degumming → alkali refining → decolorization → deodorization → dewaxing → winterization → refined rice bran oil.

[0003] In the refining process of rice bran oil, the first step is the pressing step. The pretreated rice bran is cold-pressed into a hydraulic press to squeeze out most of the bran oil. The crude rice bran oil obtained enters the physical refining workshop for subsequent refining and purification. At the same time, the cake produced by pressing enters the leaching workshop to further extract the crude oil. The leaching step is to put the cake into an oil extractor and add a solvent so that the oil in the cake is dissolved in the solvent to form a mixed oil. The solid meal is intercepted by a screen to obtain a relatively clean mixed oil. Then, coil steam heating is used to vaporize most of the solvent and evaporate it to increase the oil concentration in the mixed oil. Then, a small amount of solvent oil contained in the mixed oil is removed by stripping to further purify the rice bran oil.

[0004] After the above steps, the obtained rice bran oil needs to be further degummed. This is because rice bran oil usually contains a certain amount of phospholipids and other colloids, which will affect the stability of the oil. Hydration degumming is a commonly used method, which adds a small amount of water to the crude rice bran oil to make the water-soluble impurities therein condense and precipitate and separate from the oil.

[0005] Next is the decolorization step, which is mainly to remove the pigments and other impurities in the oil. Common decolorization methods include adsorption decolorization, which uses adsorbents such as activated carbon and white clay to remove pigments and impurities in the oil.

[0006] Deodorization is another key step in the refining process, which aims to remove odors and unpleasant flavors from the oil. This is usually achieved by distillation, where the oil is heated to a certain temperature so that volatile odorous substances escape with the steam, and the pure oil is collected by condensation.

[0007] Finally, the wax that may exist in rice bran oil is removed by dewaxing process. By controlling the temperature and stirring speed, the wax is precipitated and crystallized in the mixed oil, and then the wax is separated from the oil by filtering.

[0008] The existing rice bran oil refining process may have the following problems: Loss of oryzanol: Traditional refining processes have a great impact on oryzanol and can easily lead to its loss. Insufficient refining: Some processes may not be able to effectively remove impurities and undesirable components in rice bran oil, affecting the quality of the oil. Low production efficiency: The process of preparing rice bran oil may be relatively complicated, and production efficiency needs to be improved. High energy consumption: Some processes consume high energy during the refining process and do not meet the requirements of sustainable development. Poor decolorization effect: The decolorization step may not be optimized enough, resulting in the color of rice bran oil being less than ideal. Environmental pollution: A large amount of wastewater and waste residue may be generated during the refining process, causing pollution to the environment.

[0009] During the production and processing of rice bran oil, it needs to be dewaxed. At present, the commonly used method for dewaxing oils and fats is to rely solely on freezing and crystallization, and then mechanically separate the oil and wax without adding any auxiliary agents and auxiliary means. During separation, equipment such as pressure filtration, vacuum filtration and centrifugal separation are used. For rice bran oil, which has a high wax content, a double crystallization filtration method is usually used, that is, the deodorized rice bran oil is fully cooled to a low temperature in a cooling tank, and then filtered to remove most of the wax.

[0010] In summary, the refining process of rice bran oil is a complicated and delicate process, comprising multiple steps such as squeezing, leaching, mixed oil evaporation, sedimentation filtration, hydration degumming, decolorization, deodorization and continuous dewaxing. Each step has an important impact on final oil quality. The mixed oil continuous dewaxing preparation method of rice bran oil of the present invention is proposed just under such background, is intended to improve dewaxing efficiency, reduce equipment investment, simplify operation process, and ensure high-quality and stable of oil product by changing rice bran oil refining process sequence. Summary of the invention

[0011] The object of the present invention is to provide a mixed oil dewaxing equipment of rice bran oil and a preparation method thereof, wherein the content of extraction solvent contained in the mixed oil is about 35%, and the content of the mixed oil is about 60% to 65%. In an environment containing the extraction solvent, impurities such as wax and pigment in the mixed oil of rice bran oil are effectively removed by a physical refining method, thereby achieving a dewaxing effect with high efficiency, low consumption and high yield.

[0012] To achieve the above object, the present invention adopts the following technical solutions: A mixed oil dewaxing device of rice bran oil comprises a wax crystallization system, a filtering system and a wax purification system which are connected in sequence, wherein each system and each system are connected by pipelines and are provided with a plurality of delivery pumps for delivering a medium; the wax crystallization system comprises a crystallizer and a refrigerant tank for cooling the crystallizer, the filtering system comprises a horizontal blade filter, and the wax purification system comprises an evaporation system for evaporating and recovering wax.

[0013] A further improvement of the technical solution of the present invention is that the wax crystallization system includes a heat exchanger, a cooling auger group, a crystallizer and a refrigerant tank for cooling the crystallizer which are connected in sequence. The cooling auger group is a rotary multi-layer auger cooler, including a plurality of rotary connected inner cavities for conveying and stirring the mixed oil and an outer cavity for passing circulating cooling water. The crystallizer is a multi-stage crystallizer, including a refrigerator connected to the cooling auger group and a stirring crystallization tank connected to the refrigerator for crystallization. The refrigerant tank includes one or more, and the refrigerant is conveyed to the heat exchange pipes in the refrigerator and the stirring crystallization tank by the delivery pump II and circulated back to the refrigerant tank.

[0014] A further improvement of the technical solution of the present invention is that the filtration system includes a horizontal blade filter connected to a stirring crystallization tank, a soft fat oil tank connected to the horizontal blade filter, a flushing oil tank, a hard fat melting tank and a filter aid delivery system, and the flushing oil tank is connected to a heater and a horizontal blade filter in sequence; the filter aid delivery system includes a filter aid temporary storage tank and a filter aid mixing tank connected to the horizontal blade filter, and external steam is connected to the horizontal blade filter through a pipeline.

[0015] A further improvement of the technical solution of the present invention is that the filter aid conveying system also includes a filter aid filling hopper connected to the filter aid temporary storage tank and a conveying dragon arranged between the filter aid temporary storage tank and the filter aid mixing tank, the filter aid temporary storage tank is connected to the dust removal device, and the dust removal device includes a dust collector and a wind blower. A further improvement of the technical solution of the present invention is that the heat exchanger is connected to external steam, the steam heats the internal input mixed oil through the heat exchanger and then cools it down to form condensed water that returns to the condensed water return water tank, and the refrigerant tank includes a refrigerant tank A that transports refrigerant to the refrigerator and the stirring crystallization tank and a refrigerant tank B to which the refrigerant flows after circulation.

[0016] A further improvement of the technical solution of the present invention is that it also includes a control system for controlling the automated operation of the entire dewaxing process, and the wax purification system also includes a solvent recovery device, which is connected to the evaporation system and is used to recover the solvent in the filtered wax and filter aid.

[0017] A method for dewaxing a mixed oil of rice bran oil, using a mixed oil dewaxing device for dewaxing a mixed oil of rice bran oil according to any one of claims 1 to 6, specifically comprising the following steps: Step a. delivering the solvent-containing rice bran oil delivered from the mixing oil tank to a heat exchanger to be heated to a preset temperature; Step b. The mixed oil raised to a predetermined temperature is first cooled by a cooling auger group and then fed into a crystallizer, where the wax is precipitated and crystals are formed in the mixed oil under controlled temperature and stirring speed; Step d. The mixed oil containing wax crystals is fed into a horizontal leaf filter pre-sprayed with a filter aid, and the wax crystals are separated from the mixed oil by continuous filtration. The dewaxed mixed oil is transported to a soft oil tank for temporary storage, waiting for the next process operation; Step e. The separated wax crystals are recycled into a stearin melting box for heating and melting, and then sent to an evaporator of an evaporation system to recover the solvent contained in the wax. The wax without the solvent is transported to the next stage for drying and crushing to obtain a pure wax product; Step f. The unqualified mixed oil and the residual material after cleaning the filter residue in the horizontal leaf filter are recovered and transported to the flushing oil tank, transported to the heater by the delivery pump for heating, and then returned to the horizontal leaf filter for re-filtration.

[0018] The technical solution of the present invention is further improved in that: the solvent in the mixed rice bran oil in step a accounts for about 35%, the crude rice bran oil accounts for about 60-65%, and the residual substance in step f includes the mixed rice bran oil that fails to be dewaxed and the small waxy particles remaining after washing.

[0019] A further improvement of the technical solution of the present invention is that the preheating temperature of step a is set at 40-45°C, the outlet temperature of the cooling auger group of primary cooling is maintained at 15-20°C, the temperature of the crystallizer is controlled at about 1-3°C, the crystallization time is controlled at about 3-5h, and the stirring is continuous and uninterrupted at a moderate speed.

[0020] A further improvement of the technical solution of the present invention is that the components of the pre-sprayed filter aid include diatomaceous earth, activated carbon and kaolin, wherein the activated carbon accounts for 3‰ and the kaolin accounts for 2‰.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The mixed oil dewaxing device of rice bran oil in the present application realizes the dewaxing of the mixed oil of rice bran oil, and the dewaxing time is short, the dewaxing efficiency is improved, and the equipment investment is reduced; at the same time, the present application changes the original refining method, and starts dewaxing in the first step of the refining process, thereby reducing the viscosity of the oil in a solvent-containing environment, and with the help of a special multi-stage crystallization equipment group, it is helpful to quickly and efficiently precipitate wax, thereby improving the dewaxing efficiency.

[0022] The use of a horizontal blade filter in the mixed oil dewaxing device of rice bran oil in the present application and the spraying of filter aids in the filter can not only increase the filtration area, but also adsorb most of the pigments in the mixed oil, thereby reducing or even eliminating the complexity and cost of the subsequent decolorization process.

[0023] The present application also provides a solvent recovery device to achieve solvent recovery; the secondary filtration setting reduces the loss of mixed oil, improves the separation rate of wax, and reduces production costs; The dewaxing equipment of the present application has a simple structure, convenient operation, and is easy to maintain and service. The filter aid system is equipped with a dust removal device to reduce environmental pollution; the dewaxing process is fully automatically controlled, and the process parameters are adjusted according to actual linkage to achieve the stability of the dewaxing process and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 A schematic diagram of a mixed oil dewaxing device for rice bran oil according to the present invention; Figure 2 It is a schematic diagram of the crystallizer structure of the present invention; Figure 3 This is a schematic diagram of the structure of the cooling auger group of the present invention; Among them, 1. delivery pump I, 2. refrigerant tank B, 3. refrigerant tank A, 4. delivery pump II, 5. crystallizer, 5-1. stirring crystallization tank, 5-2. refrigerator, 6. cooling auger group, 7. heat exchanger, 8. delivery pump III, 9. delivery pump IV, 10. delivery pump V, 11. flushing oil tank, 12. heater, 13. soft grease tank, 14. horizontal blade filter, 15. hard fat melting box, 16. delivery pump VI, 17. filter aid mixing tank, 18. delivery dragon, 19. filter aid temporary storage tank, 20. dust collector, 21. air transport fan, 22. filter aid filling hopper, 23. evaporation system. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with embodiments: Example 1 A mixed oil dewaxing device for rice bran oil comprises a wax crystallization system, a filtering system, and a wax purification system which are connected in sequence, wherein each system and each system are connected by pipelines and are provided with a plurality of delivery pumps for conveying a medium; the wax crystallization system comprises a crystallizer 5 and a refrigerant tank for cooling the crystallizer 5, the filtering system comprises a horizontal blade filter 14, and the wax purification system comprises an evaporation system 23 for repeatedly evaporating the wax.

[0027] Specifically, Figure 1 As shown, a mixed oil dewaxing device of rice bran oil includes a refrigerant tank A, a refrigerant tank B, a crystallizer 5, a cooling auger group 6, a horizontal blade filter 14, a filter aid mixing tank 17, a filter aid temporary storage tank 19, a heater 12, a heat exchanger 7, a flushing oil tank 11, a soft fat oil tank 13, a hard fat melting tank 15, an evaporation system 23, and various delivery pumps, a stirring pump, and a fan. Each device is connected by a pipeline to realize a continuous and automated refining process.

[0028] The wax crystallization system includes a heat exchanger 7, a cooling auger group 6, a crystallizer 5 and a refrigerant tank for cooling the crystallizer 5, which are connected in sequence. The cooling auger group 6 is a rotary multi-layer auger cooler, which includes multiple rotary connected inner cavities for conveying and stirring mixed oil and an outer cavity for circulating cooling water. Figure 3 As shown, the cooling auger group 6 includes n auger conveyors arranged side by side, n>2, an outer cavity is arranged outside the auger conveyor to wrap the auger conveyor, that is, the inner cavity is the auger conveyor for conveying the mixed oil, and circulating cooling water is introduced into the outer cavity to cool the mixed oil. The multiple auger conveyors are connected end to end in sequence, and the media in the inner and outer cavities are conveyed from head to tail. The number of auger conveyors can be selected according to needs. A driving device for driving the spiral blades to rotate, such as a motor, is provided at one end of the auger conveyor. The auger conveyors with the same rotation direction of the spiral blades can be driven by a chain, and only one driving motor is required.

[0029] like Figure 2 As shown, the crystallizer 5 is a multi-stage crystallizer, including a refrigerator 5-2 connected to a cooling auger group 6 and a stirring crystallization tank 5-1 for crystallization connected to the refrigerator 5-2. Heat exchange tubes are provided in the refrigerator 5-2 and the stirring crystallization tank 5-1 for circulation of refrigerant to cool the mixed oil therein. The refrigerator 5-2 first cools the mixed oil, and then inputs the mixed oil into the stirring crystallization tank 5-1, and then cools and crystallizes. The refrigerant tank includes one or more, and the refrigerant is transported to the heat exchange tubes in the refrigerator 5-2 and the stirring crystallization tank 5-1 through the delivery pump II4 and circulated back to the refrigerant tank.

[0030] In a specific embodiment, the refrigerator includes a shell and a serpentine-arranged pipe arranged in the shell. The shell is provided with a refrigerant input and discharge port, and the outlet of the pipe is connected to the stirring crystallization tank 5-1. The refrigerant circulates in the refrigerator, thereby cooling the mixed oil in the pipe.

[0031] A heat exchange tube is arranged inside the stirring crystallization tank 5-1 for circulating and cooling the refrigerant. Under the action of stirring, the mixed oil in the stirring crystallization tank 5-1 is further cooled and crystallized.

[0032] The heat exchanger 7 is connected to the external steam. The steam heats the internal input mixed oil through the heat exchanger 7 and then cools it down to form condensed water which returns to the condensed water return water tank. The refrigerant tank includes the refrigerant tank A3 which transports the refrigerant to the refrigerator 5-2 and the stirring crystallization tank 5-1 and the refrigerant tank B2 to which the refrigerant flows after circulation.

[0033] The filtration system includes a horizontal blade filter 14 connected to the stirring crystallization tank 5-1, a soft fat oil tank 13 connected to the horizontal blade filter 14, a hard fat melting box 15 and a filter aid delivery system, wherein the filter aid delivery system includes a filter aid temporary storage tank 19 and a filter aid mixing tank 17 connected to the horizontal blade filter 14, and external steam is connected to the horizontal blade filter 14 through a pipeline.

[0034] The filter aid conveying system also includes a filter aid filling hopper 22 connected to the filter aid temporary storage tank 19 and a conveying dragon 18 arranged between the filter aid temporary storage tank 19 and the filter aid mixing tank 17. The filter aid temporary storage tank 19 is connected to a dust removal device, and the dust removal device includes a dust collector 20 and a wind blower 21.

[0035] A mixed oil dewaxing device for rice bran oil also includes a control system and a solvent recovery device in a wax purification system. The solvent recovery device is connected to an evaporation system and is used for recovering unqualified mixed oil after filtration and recovering the solvent in wax and filter aids. The solvent during evaporation of wax crystals in the evaporation system can be recovered. The control system is used for controlling the automatic operation of the entire dewaxing process.

[0036] A mixed oil dewaxing method for rice bran oil, the concrete steps are as follows: Step a. The solvent-containing rice bran oil transported from the mixing oil tank is transported to the heat exchanger 7 to be heated to a preset temperature; Step b. The mixed oil raised to a predetermined temperature is first cooled by a cooling auger group 6 and then fed into a crystallizer 5, where the wax is precipitated and crystals are formed in the mixed oil under controlled temperature and stirring speed; Step d. The mixed oil containing wax crystals is fed into a horizontal leaf filter 14 pre-sprayed with a filter aid, and the wax crystals are separated from the mixed oil by continuous filtration. The dewaxed mixed oil is transported to the soft fat oil tank 13 for temporary storage, waiting for the next process operation; Step e. The separated wax crystals are recycled into the stearin melting tank 15 for heating and melting, and then sent to the evaporator of the evaporation system 23 to recover the solvent contained in the wax. The wax without the solvent is transported to the next stage for drying and crushing to obtain a pure wax product; Step f. The unqualified mixed oil and the residual material after cleaning the filter residue in the horizontal blade filter 14 are recovered and transported to the flushing oil tank 11, transported to the heater 12 by the delivery pump, heated, and then returned to the horizontal blade filter 14 for re-filtration.

[0037] The specific steps are introduced in detail in conjunction with the mixed oil dewaxing device.

[0038] The crude mixed oil after extraction is stored in the mixed oil tank and pumped to the heat exchanger 7 for preheating treatment, so that the mixed oil temperature reaches a certain temperature, which is convenient for subsequent crystallization treatment. External steam is introduced into the heat exchanger 7 to heat the mixed oil, and the condensed water after heat exchange returns to the condensed water heat recovery hot water tank.

[0039] The refrigerant in the refrigerant tank A is transported to the heat exchange coil of the stirring crystallization tank 5-1 and the coil of the refrigerator 5-2 supporting the stirring crystallization tank 5-1 through the delivery pump II4, and the refrigerant after heat exchange flows back to the refrigerant tank B.

[0040] After the mixed oil is heated to a predetermined temperature in the heat exchanger 7, it is first transported to the cooling auger group 6 for primary cooling. The cooling auger group 6 is a rotary multi-layer auger cooler, which is divided into an inner cavity and an outer cavity. The inner cavity uses an auger to stir the mixed oil so that the heat therein is quickly dissipated. The outer cavity is always connected to circulating cooling water to take away the dissipated heat, and finally the outlet temperature reaches 15-20°C. Then it enters the refrigerator 5-2 of the crystallizer 5 for secondary cooling. After the mixed oil flows to the refrigerator 5-2, the outlet temperature can be quickly reduced to 8-12°C; then it enters the stirring crystallization tank 5-1 to accelerate the crystallization time in the stirring crystallization tank 5-1. By setting the refrigerant flow rate in the heat exchange tube of the stirring crystallization tank 5-1, as well as the continuous and uninterrupted stirring time and frequency in the tank, the crystallization time of the wax in the stirring crystallization tank 5-1 is controlled. And because the viscosity of the oil is reduced in a solvent-containing environment, it is helpful for the precipitation of wax and accelerates the crystallization time of wax. During this process, the crystallization process can be monitored in real time through an online monitoring system to ensure the stability and consistency of the crystallization effect.

[0041] The mixed oil containing wax crystals is input into the horizontal blade filter 14 through the delivery pump III8. Before the horizontal blade filter 14 starts filtering the wax, the filter aid in the filter aid temporary storage tank 19 is delivered to the filter aid mixing tank 17 through the delivery auger 18 for stirring and mixing.

[0042] The main component of the filter aid is diatomaceous earth, and contains 3‰ activated carbon, 2‰ white clay, etc. This allows the filter aid to better adhere to the filter blades.

[0043] The filter aid is delivered to the tank of the horizontal leaf filter 14 through the delivery pump VI 16, and a layer of the filter aid is sprayed on each filtering blade of the horizontal leaf filter 14. The filter aid has rich microporous structure and surface active sites inside, which can not only help the filtering blades of the horizontal leaf filter 14 to increase the filtering area, but also make most of the pigments in the mixed oil adsorbed on the filter aid.

[0044] The mixed oil that is completely crystallized in the stirred crystallization tank 5 is transported to the horizontal blade filter 14 and filtered according to the pressure difference. Due to the addition of filter aids, the filtering time is greatly accelerated. At the same time, due to the adsorption of pigments, the decolorization process and decolorization cost of the subsequent decolorization process are reduced. In the entire process of adding, stirring, and pre-coating filter aids, adding dust removal devices: dust collector 20 and air transport fan 21 can effectively reduce environmental pollution.

[0045] The qualified dewaxed mixed oil is transported to the soft oil tank 13 for temporary storage, waiting for the next process operation.

[0046] When the filter cake in the horizontal leaf filter 14 needs to be cleaned, high-temperature steam directly connected to the horizontal leaf filter 14 is blown into the horizontal leaf filter 14 to start softening and cleaning the filter cake. The wax in the filter cake is recovered into the stearin melting box 15, and heated and melted again in the stearin melting box 15. It is transported to the evaporation system 23 through the delivery pump Ⅰ1 to recover the residual extraction solvent in the wax. Since the wax has a high viscosity, after repeated evaporation, the pure wax obtained is transported to the next stage for subsequent treatment such as drying and crushing to obtain a pure wax product. The loss of solvent is greatly reduced, and the production cost is reduced.

[0047] The fine filter cake particles remaining in the horizontal leaf filter 14 after flushing and cleaning, or the unqualified mixed oil containing more wax crystals in the early and late stages of filtration, are transported to the flushing oil tank 11, and after being transported to the heater 12 by the delivery pump V10 and heated to a certain temperature, they are transported to the horizontal leaf filter 14 for secondary filtration. The oil yield of the dewaxed qualified mixed oil in the horizontal leaf filter 14 is improved, the production efficiency is improved, and the production cost is reduced.

[0048] Important process parameters in the dewaxing process, such as the refrigerant heat exchange flow rate, the stirring speed of the stirred crystallization tank, the pre-spraying thickness of the filter aid, and the heating temperature, are monitored and adjusted in real time through the online monitoring and control system throughout the entire process to ensure the efficient and continuous dewaxing process and the guarantee of product yield.

Claims

1. A mixed oil dewaxing device for rice bran oil, characterized in that: The invention comprises a wax crystallization system, a filtration system, and a wax purification system which are connected in sequence, wherein each system and each system are connected by pipelines and are provided with a plurality of delivery pumps for delivering a delivery medium; the wax crystallization system comprises a crystallizer (5) and a refrigerant tank for cooling the crystallizer (5), the filtration system comprises a horizontal blade filter (4), and the wax purification system comprises an evaporation system (23) for evaporating and recovering the wax.

2. the mixed oil dewaxing device of a kind of rice bran oil according to claim 1, is characterized in that: The wax crystallization system comprises a heat exchanger (7), a cooling auger group (6), a crystallizer (5) and a refrigerant tank for cooling the crystallizer (5) which are connected in sequence. The cooling auger group (6) is a rotary multi-layer auger cooler, comprising a plurality of rotary connected inner cavities for conveying and stirring mixed oil and an outer cavity for introducing circulating cooling water. The crystallizer (5) is a multi-stage crystallizer, comprising a refrigerator (5-2) connected to the cooling auger group (6) and a stirring crystallization tank (5-1) for crystallization connected to the refrigerator (5-2). The refrigerant tank comprises one or more refrigerant, and the refrigerant is conveyed to the heat exchange pipes in the refrigerator (5-2) and the stirring crystallization tank (5-1) by a conveying pump II (4) and circulated back to the refrigerant tank.

3. the mixed oil dewaxing device of a kind of rice bran oil according to claim 2, is characterized in that: The filtration system comprises a horizontal blade filter (14) connected to the stirring crystallization tank (5-1), a soft fat oil tank (13) connected to the horizontal blade filter (14), a flushing oil tank (11), a hard fat melting tank (15), and a filter aid delivery system, wherein the flushing oil tank (11) is connected to the heater (12) and the horizontal blade filter (14) in sequence; the filter aid delivery system comprises a filter aid temporary storage tank (19) and a filter aid mixing tank (17) connected to the horizontal blade filter (14), and external steam is connected to the horizontal blade filter (14) via a pipeline.

4. the mixed oil dewaxing device of a kind of rice bran oil according to claim 3, is characterized in that: The filter aid conveying system further comprises a filter aid filling hopper (22) connected to the filter aid temporary storage tank (19) and a conveying dragon (18) arranged between the filter aid temporary storage tank (19) and the filter aid mixing tank (17); the filter aid temporary storage tank (19) is connected to a dust removal device, and the dust removal device comprises a dust collector (20) and an air conveying fan (21).

5. the mixed oil dewaxing device of a kind of rice bran oil according to claim 2, is characterized in that: The heat exchanger (7) is connected to external steam. The steam heats the internal input mixed oil through the heat exchanger (7) and then cools it down to form condensed water, which returns to the condensed water return water tank. The refrigerant tank includes a refrigerant tank A (3) for conveying refrigerant to the refrigerator (5-2) and the stirring crystallization tank (5-1) and a refrigerant tank B (2) to which the refrigerant flows after circulation.

6. A mixed oil dewaxing device for rice bran oil according to claim 1, characterized in that, It also includes a control system for controlling the automated operation of the entire dewaxing process. The wax purification system also includes a solvent recovery device, which is connected to the evaporation system and is used to recover the solvent from the filtered wax and filter aid.

7. A method for dewaxing a mixed oil of rice bran oil, characterized in that A mixed oil dewaxing device for rice bran oil using any one of claims 1 to 6 specifically comprises the following steps: Step a. transporting the solvent-containing rice bran oil transported from the mixing oil tank to the heat exchanger (7) to heat it to a preset temperature; Step b. The mixed oil raised to a predetermined temperature is first cooled by a cooling auger group (6) and then fed into a crystallizer (5), where the wax is precipitated and crystals are formed in the mixed oil under controlled temperature and stirring speed; Step d. The mixed oil containing wax crystals is fed into a horizontal leaf filter (14) pre-sprayed with a filter aid, and the wax crystals are separated from the mixed oil by continuous filtration. The dewaxed mixed oil is transported to a soft fat oil tank (13) for temporary storage, awaiting the next step of operation; Step e. The separated wax crystals are returned to the stearin melting tank (15) for heating and melting, and then sent to the evaporator of the evaporation system (23) to recover the solvent contained in the wax. The wax with the solvent removed is sent to the next stage for drying and crushing to obtain a pure wax product; Step f. The unqualified mixed oil and the residual material after cleaning the filter residue in the horizontal blade filter (14) are recovered and transported to the flushing oil tank (11), transported to the heater (12) through a delivery pump, heated, and then returned to the horizontal blade filter (14) for re-filtration.

8. the mixed oil dewaxing method of a kind of rice bran oil according to claim 7 is characterized in that: The solvent accounts for about 35% of the mixed rice bran oil in step a, and the crude rice bran oil accounts for about 60-65%. The residual substances in step f include the unqualified rice bran oil mixed oil after dewaxing and the small waxy particles remaining after washing.

9. the mixed oil dewaxing method of a kind of rice bran oil according to claim 7 is characterized in that: In step a, the preheating temperature is set at 40-45°C, the outlet temperature of the primary cooling auger group (6) is maintained at 15-20°C, the temperature of the crystallizer (5) is controlled at about 1-3°C, the crystallization time is controlled at about 3-5h, and the stirring is continuous and at a moderate speed.

10. A method for dewaxing a mixed oil of rice bran oil according to claim 7, wherein: The components of the pre-sprayed filter aid include diatomaceous earth, activated carbon and kaolin, of which activated carbon accounts for 3‰ and kaolin accounts for 2‰.

Images