Mixed oil refining device for rapeseed oil

Abstract

The utility model discloses a mixed oil refining device for rapeseed oil, which belongs to the technical field of oil refining processing and comprises a pretreatment system, an alkali preparation system, a mixed saponification system and a soap removal system which are connected through pipelines, and delivery pumps for delivering media are arranged among the systems and in the systems. The pretreatment system comprises a mixed oil tank and a heater I for heating mixed oil, the alkali preparation system comprises an alkali preparation box and an alkali liquor stirring tank, the mixing system comprises a temporary mixing tank, a constant-temperature mixer and a horizontal vortex stirring tank which are connected in sequence, and the soap removal system comprises a centrifugal machine and a hot water tank connected with the centrifugal machine. According to the device, the refining process is continuous, the automation degree is high, the centrifugal machine is always filled with nitrogen for protection, the labor intensity is reduced, the production efficiency is improved, and the yield of finished oil is improved; and meanwhile, the refining equipment is simple in structure, convenient to operate and easy to maintain.

Description

Technical Field

[0001] This utility model belongs to the field of oil refining and processing technology, specifically relating to a mixed oil refining device for rapeseed oil. Background Technology

[0002] Rapeseed oil, also known as rapeseed oil, is an edible oil extracted from rapeseed. It is one of my country's main edible oils, primarily produced in the Yangtze River basin and the southwest and northwest regions, and is the world's largest producer.

[0003] Rapeseed oil, a nutritious and healthy edible oil, is widely used in the food and cooking industries. However, due to variations in the quality of raw rapeseed and technical issues during processing, the resulting rapeseed oil blends often contain significant amounts of impurities and harmful substances, such as phospholipids, free fatty acids, pigments, and gums, affecting the quality and safety of the oil. Therefore, developing efficient and environmentally friendly rapeseed oil blend refining equipment, preparation methods, and related devices is of great significance for improving the quality and market competitiveness of rapeseed oil blends.

[0004] The blended oil produced after the initial refining of rapeseed oil typically contains a variety of substances. These substances can be mainly classified into the following categories:

[0005] Oils and fats: oils obtained by pressing or solvent extraction of rapeseed; glycerides. Rapeseed oil is mainly composed of glycerides, which are esterification products of fatty acids and glycerol (glycerol).

[0006] Non-oil components: Phospholipids, a natural component found in vegetable oils, mainly including lecithin and cephalin. Phospholipids need to be removed during oil refining because they affect the storage stability and taste of the oil; Free fatty acids, some oils undergo hydrolysis during pressing or extraction, producing free fatty acids, which need to be removed through refining; Pigments, rapeseed oil contains natural pigments such as chlorophyll and carotenoids, which affect the color of the oil; Waxes, a solid component in vegetable oils, mainly affect the transparency and taste of the oil; Moisture, the initially refined blended oil may still contain a certain amount of moisture, which needs to be removed through drying; Solid impurities, such as rapeseed hulls and mud, need to be removed during refining through filtration and other methods.

[0007] Trace components: Rapeseed oil also contains some bioactive trace components, such as vitamin E, sterols, and squalene. Some of these components may be lost during the refining process.

[0008] After the initial refining of rapeseed oil, the blended oil (crude oil) needs to be further processed to remove phospholipids, free fatty acids, pigments, waxes and solid impurities. The blended oil refining device for rapeseed oil of this invention, combined with the corresponding process, can achieve efficient removal of impurities such as unsaturated fatty acids and phospholipids, while retaining the nutrition and quality of the neutral oil to the greatest extent. Utility Model Content

[0009] The purpose of this invention is to provide a refining apparatus for rapeseed oil blends. The blended oil produced after evaporation contains approximately 35% extraction solvent and 60%–65% blended oil content. Under an alkali-containing refining environment, impurities and pigments in the rapeseed oil blends are effectively removed through chemical refining, improving the quality and safety of the oil.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0011] A rapeseed oil blending refining apparatus includes a pretreatment system, an alkali preparation system, a blending saponification system, and a deshaoping system connected by pipelines. Each system is equipped with a transport pump for conveying the medium. The pretreatment system includes a blending oil tank and a heater I for heating the blending oil. The alkali preparation system includes an alkali preparation tank and an alkali mixing tank. The blending system includes a temporary mixing tank, a constant temperature mixer, and a horizontal vortex mixing tank connected in sequence. The deshaoping system includes a centrifuge and a hot water tank connected thereto.

[0012] A further improvement of this utility model is that the mixing oil tank is connected to an evaporation system. The crude oil extracted from rapeseed is partially solvent-removed by the evaporation system and then enters the mixing oil tank through a transfer pump. The mixing oil tank is connected to heater I.

[0013] A further improvement of the present invention is that the alkali preparation system also includes a filter disposed between the alkali preparation tank and the alkali mixing tank, and both the alkali mixing tank and the heater I are connected to the temporary mixing tank.

[0014] A further improvement of the present invention is that the thermostatic mixer includes a thermostatic jacket through which hot water can be introduced and a double-helix mixing tube disposed within the thermostatic jacket.

[0015] A further improvement of the present invention is that the horizontal vortex mixing tank includes stationary mixing blades disposed on the inner wall of the horizontal vortex mixing tank and dynamic mixing blades disposed on the mixing paddle.

[0016] A further improvement of the present invention is that the centrifuge is connected to N2 and to a refined mixed oil tank, and the refined mixed oil tank is connected to a secondary evaporation system.

[0017] A further improvement of this utility model is that the centrifuge is connected to a heat exchanger for cooling the centrifuge.

[0018] A further improvement of this utility model is that the exhaust steam used in the rapeseed oil refining device is connected to a soft water tank, and the heat exchanger is connected to the soft water tank.

[0019] A further improvement of this utility model is that it also includes a control system, which provides unified control over the pretreatment system, alkali preparation system, mixed saponification system, desanding system, primary evaporation system, and secondary evaporation system.

[0020] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0021] The rapeseed oil blending refining device of this application adopts a chemical refining method, which can effectively remove impurities and pigments from the rapeseed oil blend, thereby improving the quality and safety of the oil. The blending saponification system of this application, in an environment containing soluble alkali, uses specially designed mixing and stirring equipment to compensate for the weakness of the saponification reaction under various mixing methods, specific temperatures, pressures, and stirring frequencies. It can also remove most of the phospholipids and unsaturated fatty acids while increasing the yield of finished oil. In an environment containing soluble alkali, pigments will be adsorbed onto the soap pods produced by the saponification reaction, which can be removed together through desap removal.

[0022] The refining process of this application is continuous and highly automated. The centrifuge is always filled with nitrogen for protection, which reduces labor intensity, improves production efficiency, and increases the yield of finished oil. At the same time, the refining equipment has a simple structure, is easy to operate, and is easy to maintain and service. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a rapeseed oil refining device according to the present invention;

[0024] Figure 2 This is a schematic diagram of the thermostatic mixer of this utility model;

[0025] Figure 3 This is a cross-sectional view of a double-helix mixing tube;

[0026] Figure 4 This is a schematic diagram of a horizontal vortex mixer;

[0027] Among them, 1. Heater I, 2. Temporary mixing tank, 3. Thermostatic mixer, 3-1. Double spiral mixing tube, 3-2. Thermostatic jacket, 4. Horizontal vortex agitator, 4-1. Static stirring blade, 4-2. Dynamic stirring blade, 5. Transfer pump I, 6. Heater II, 7. Centrifuge, 8. Mixed oil tank, 9. Transfer pump II, 10. Transfer pump III, 11. Liquid alkali mixing tank, 12. Transfer pump IV, 13. Filter, 14. Liquid alkali tank, 15. Hot water tank, 16. Transfer pump V, 17. Soft water tank, 18. Transfer pump VI, 19. Heat exchanger, 20. Distillation mixed oil temporary storage tank, 21. Transfer pump VII, 22. Primary evaporation system, 23. Secondary evaporation system. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to embodiments:

[0029] like Figure 1 As shown, a rapeseed oil blending refining apparatus includes a pretreatment system, an alkali preparation system, a blending saponification system, and a desanding system connected by pipelines. Each system is equipped with a transfer pump for conveying the medium. The pretreatment system includes a blending oil tank 8 and a heater I1 for heating the blended oil. The blending oil tank 8 is connected to an evaporation system 22. After the crude rapeseed oil is partially desolventized by the evaporation system 22, it enters the blending oil tank 8 through the transfer pump. The blending oil tank 8 is connected to the heater I1, and the blending oil tank 8 conveys the blended oil to the heater I1 for heating.

[0030] The alkali preparation system includes an alkali preparation tank 14 and an alkali mixing tank 11, as well as a filter 13 installed between the alkali preparation tank 14 and the alkali mixing tank 11. The alkali mixing tank 11 and the heater I1 are both connected to the temporary mixing tank 2. After the mixed oil is preheated in the heater I, it is transported to the temporary mixing tank 2. After the alkali preparation system prepares the alkali solution, it is also transported from the alkali mixing tank 11 to the temporary mixing tank 2 for preliminary mixing of oil and alkali.

[0031] The mixing system includes a temporary mixing tank 2, a thermostatic mixer 3, and a horizontal vortex stirring tank 4 connected in sequence. The thermostatic mixer 3 includes a thermostatic jacket 3-2 through which hot water can be introduced and a double-helix mixing pipe 3-1 disposed within the thermostatic jacket 3-2. Figure 2 , 3 As shown, the double-helix mixing tube 3-1 is a channel formed by two tubes joined together and communicating along their length. Its cross-section is the outer contour of two intersecting circles of the same diameter. This arrangement increases the amount of oil flowing within the channel, making it easier for external hot water to heat the oil inside the double-helix mixing tube 3-1. The horizontal vortex mixing tank 4 includes stationary stirring blades 4-1 disposed on the inner wall of the horizontal vortex mixing tank 4 and moving stirring blades 4-2 disposed on the stirring paddle, as shown... Figure 4As shown, the moving stirring blade 4-2 is located between the stationary stirring blade 4-1. During operation, the rotating stirring paddle drives the moving stirring blade 4-2 to rotate. While the mixed oil and alkali solution are stirred by the moving stirring blade 4-2 in the horizontal vortex mixing tank 4, the stationary stirring blade 4-1 helps the mixed oil and alkali solution to mix better.

[0032] The desoaping system includes a centrifuge 7 and a connected hot water tank 15. The centrifuge 7 is connected to nitrogen (N2) and is protected by N2 during centrifugation. The centrifuge 7 is also connected to a refined mixed oil tank 20, where the desoaped refined mixed oil is temporarily stored. The refined mixed oil tank 20 is connected to a secondary evaporation system 23. The centrifuge 7 is connected to a heat exchanger 19 for cooling, and water in the heat exchanger 19 flows to the centrifuge 7 to cool it.

[0033] The exhaust steam used in the rapeseed oil blending refining unit is connected to the soft water tank 17, and the heat exchanger 19 is connected to the soft water tank 17.

[0034] The rapeseed oil blending refining unit also includes a control system, which provides unified control over the pretreatment system, alkali preparation system, blending saponification system, desapification system, as well as the primary evaporation system 22 and the secondary evaporation system 23. The entire refining process can achieve continuous and automated production.

[0035] The following section details the rapeseed oil blending refining apparatus of this application, using specific refining processes as examples.

[0036] The crude mixed oil produced by the evaporation system 22 undergoes partial solvent removal and is then pumped to the mixed oil tank 8 for settling. During settling, colloids, impurities, and harmful substances in the mixed oil separate, precipitate, and separate into layers, reducing oxidation of the crude mixed oil. Crude mixed oil is then drawn from a suitable location in the mixed oil tank 8 and pumped to the heater 1 via the transfer pump II 9 for heating. After the temperature reaches a predetermined level, it is transferred to the temporary mixing tank 2.

[0037] Simultaneously, the workshop's quantitative feeding device adds water and alkali (such as caustic soda flakes) to the alkali mixing tank 14 in a certain proportion. After filtering out undissolved large alkali particles by the filter 13, the solution is pumped by the transfer pump 12 to the alkali mixing tank 11 for heating and stirring. The completely dissolved and prepared alkali solution is pumped by the transfer pump IV 10 to the temporary mixing tank 2 for a short-term, preliminary saponification reaction with the crude mixed oil. Stirring in the temporary mixing tank 2 accelerates the reaction rate to a certain extent. After 3-5 minutes of stirring, the mixed oil is transferred to the thermostatic mixer 3, where different fluids are well dispersed and thoroughly mixed. Then, the mixed oil is transferred to the horizontal vortex mixer 4 for final mixing and stirring, which not only accelerates the saponification reaction process but also maintains the fluidity of the mixed oil after the temperature drops.

[0038] After saponification, the mixed oil is pumped by pump I5 to heater 6 for reheating to improve its fluidity, and then pumped to centrifuge 7 for desap removal. During the washing process, hot water is continuously added, which not only removes soap shavings but also causes phospholipids and other gum impurities to absorb water, swell, and coagulate, thus removing them along with the soap shavings. The desap-refined mixed oil is then temporarily stored in refined mixed oil tank 20 and pumped by pump 21 to the next process, awaiting washing and solvent evaporation.

[0039] In the above process, the mixed oil always contains extraction solvent, which inhibits the reaction between the mixed oil and the alkali solution (referred to as "solvent-containing alkali refining"). However, in the temporary mixing tank 2, the constant temperature mixer 3 and the horizontal vortex stirring tank 4, by using different mixing methods, different stirring frequencies, and under the control of specific temperature and pressure, it is possible to remove most of the phospholipids and unsaturated fatty acids while improving the yield of finished oil.

[0040] In an environment containing soluble alkali, while soap is being removed in centrifuge 7, pigments (mainly residues from the extraction of rapeseed husks, etc.) will be adsorbed onto the soap pods produced by the saponification reaction, and can be removed by washing with water.

[0041] The refined mixed oil temporarily stored in the refined mixed oil tank 20 is transported by the transfer pump 21 to the secondary evaporation system 23 to remove solvents and deodorize in the deodorization tower, and then rapeseed oil with stable quality, clear and transparent color, good taste and rich nutrition can be obtained.

[0042] In this process, the steam introduced into heater I and heater II is discharged to soft water tank 17 after use. Heat exchanger 19 is connected to soft water tank 17, and the wastewater therein can also be discharged into soft water tank 17 for cooling and sedimentation before being discharged.

Claims

1. A rapeseed oil blending refining apparatus, characterized in that: The system includes a pretreatment system, an alkali preparation system, a mixing and saponification system, and a desoaping system connected by pipelines. Each system is equipped with a transfer pump for conveying the medium. The pretreatment system includes a mixing oil tank (8) and a heater I (1) for heating the mixed oil. The alkali preparation system includes an alkali preparation tank (14) and an alkali mixing tank (11). The mixing system includes a temporary mixing tank (2), a constant temperature mixer (3), and a horizontal vortex mixing tank (4) connected in sequence. The desoaping system includes a centrifuge (7) and a hot water tank (15) connected thereto.

2. The rapeseed oil blending refining apparatus according to claim 1, characterized in that: The mixing tank (8) is connected to an evaporation system (22). The crude oil extracted from rapeseed is partially desolventized by the evaporation system (22) and then enters the mixing tank (8) through a transfer pump. The mixing tank (8) is connected to heater I (1).

3. The rapeseed oil blending refining apparatus according to claim 1, characterized in that: The alkali preparation system also includes a filter (13) disposed between the alkali preparation tank (14) and the alkali mixing tank (11), and the alkali mixing tank (11) and the heater I (1) are both connected to the temporary mixing tank (2).

4. The rapeseed oil blending refining apparatus according to claim 1, characterized in that: The thermostatic mixer (3) includes a thermostatic jacket (3-2) through which hot water can be introduced and a double helix mixing tube (3-1) disposed in the thermostatic jacket (3-2). The cross-section of the double helix mixing tube (3-1) is the outer contour of two circles of the same diameter intersecting.

5. The rapeseed oil blending refining apparatus according to claim 1, characterized in that: The horizontal vortex mixing tank (4) includes a stationary stirring blade (4-1) disposed on the inner wall of the horizontal vortex mixing tank (4) and a moving stirring blade (4-2) disposed on the stirring paddle.

6. The rapeseed oil blending refining apparatus according to claim 1, characterized in that: The centrifuge (7) is connected to N2 and to the refined mixed oil tank (20), which is connected to the secondary evaporation system (23).

7. The rapeseed oil blending refining apparatus according to claim 6, characterized in that: Centrifuge (7) is connected to heat exchanger (19) for cooling centrifuge (7).

8. The rapeseed oil blending refining apparatus according to claim 1, characterized in that: The exhaust steam used in the rapeseed oil blending refining unit is connected to the soft water tank (17), and the heat exchanger (19) is connected to the soft water tank (17).

9. A rapeseed oil blending refining apparatus according to any one of claims 1-8, characterized in that: It also includes a control system, which provides unified control over the pretreatment system, alkali preparation system, mixed saponification system and desanding system, as well as the primary evaporation system (22) and the secondary evaporation system (23).

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