A device for low-temperature dephosphorization, dewaxing and degreasing of pressed rapeseed oil

Abstract

This utility model relates to the field of rapeseed oil production technology, and in particular to a device for low-temperature dephosphorization, dewaxing, and degreasing of rapeseed oil. The device includes a tank, with a cooling component installed on the inner wall of the tank. The cooling component includes a spiral coil installed on the inner wall of the tank. The lower end of the tank is connected to a coil inlet, and the upper end of the spiral coil is connected to a coil outlet. A stirring component, including a motor, is installed on the top of the tank. This utility model solves the problem of turbidity in rapeseed oil during winter. By using low-temperature control, the oxidation of unsaturated fatty acids is avoided, maximizing the preservation of the rapeseed oil's aroma. The integrated automatic low-temperature control reduces material transfer losses, resulting in clear and transparent oil. The indirect treatment process avoids the addition of strong acids and alkalis, introduces no impurities, and is economical and safe.

Description

Technical Field

[0001] This utility model relates to the field of rapeseed oil production technology, specifically to a device for low-temperature dephosphorization, dewaxing, and degreasing of rapeseed oil. Background Technology

[0002] Currently, in the production and processing of pressed rapeseed oil, hydration and degumming are necessary to remove pectin-soluble impurities. These impurities mainly include phospholipids. Existing processing involves adding a certain amount of hot, slightly salty water to the pressed rapeseed oil. The phospholipids absorb water, swell, coagulate, and are then separated by centrifugation. The disadvantages of this process are the large amount of water added and the significant loss of heat-sensitive vitamins and aroma compounds after vacuum drying, resulting in a short-lasting aroma in the market and a lack of product competitiveness.

[0003] During long-term storage, pressed rapeseed oil develops a sediment layer at the bottom of the bottle, and white flocculent suspended matter easily appears when the bottle is inverted, affecting its appearance and aesthetics. This phenomenon is caused by residual wax from the rapeseed coat during the pressing process. This wax crystallizes and solidifies at low temperatures, and can also contribute to a bitter taste or a sticky texture, affecting the smoothness of the dish. To improve the consumer's sensory experience, pressed rapeseed oil must be dewaxed.

[0004] In low-temperature winter environments, pressed rapeseed oil may exhibit a cloudy, crystallized, and hazy appearance. Component analysis of this phenomenon reveals that the precipitates are mostly saturated fatty acids, and the main saturated fatty acid in rapeseed oil is palmitic acid. To make the oil clear and bright and improve product quality, we designed a low-temperature dephosphorization, dewaxing, and degreasing device for pressed rapeseed oil. Utility Model Content

[0005] The purpose of this invention is to provide a device for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil. It utilizes the physical properties of phospholipids, waxes, and saturated fatty acids to achieve degreasing, dewaxing, and removal of saturated fatty acids by using a low-temperature precipitation method, thus solving the problem of turbidity in pressed rapeseed oil during winter.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil, comprising a tank, a cooling component provided on the inner wall of the tank, the cooling component including a spiral coil installed on the inner wall of the tank, a coil inlet connected to the lower end of the tank, a coil outlet connected to the upper end of the spiral coil, a stirring component provided on the top of the tank, the stirring component including a motor fixedly installed at the center of the top, a stirring shaft fixedly installed on the output shaft of the motor, stirring blades fixedly sleeved on the surface of the stirring shaft, an observation port connected to the top left side of the tank, an oil inlet pipe, a temperature sensor and a return port respectively installed on the top of the tank, and a pre-coated filter assembly provided on the bottom of the tank.

[0007] Preferably, the bottom of the tank is fixedly equipped with support legs, and the front and rear sides of the bottom of the tank are connected with slag discharge ports.

[0008] Preferably, the pre-coated filter assembly includes a connecting pipe, which is connected to the bottom of the tank, and the bottom of the connecting pipe is connected to a housing, and the bottom of the housing is connected to a discharge pipe.

[0009] Preferably, a filter cloth plate is provided through the inner cavity of the outer shell, the top of the filter cloth plate is coated with diatomaceous earth, the right side of the filter cloth plate extends through to the right side of the outer shell, and a bolt is provided through the top of the surface of the filter cloth plate, the bolt being threaded to the top of the outer shell.

[0010] Preferably, a plate and frame filter is installed at the top of the oil inlet pipe, and the feed end of the plate and frame filter is connected to a raw material tank via an oil pump.

[0011] Preferably, the inlet end of the coil is connected to a temperature control system, and the outlet end of the temperature control system is connected to the return port.

[0012] Preferably, the bottom of the pre-coated filter assembly is connected to a diaphragm filter via an oil pump 2, and the outlet of the diaphragm filter is connected to a finished oil tank via an oil pump 3.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention utilizes a low-temperature control device to avoid the oxidation of unsaturated fatty acids, thus preserving the aroma of rapeseed oil to the greatest extent. The integrated automatic low-temperature control reduces material transfer losses, resulting in clear and transparent oil. The indirect treatment process avoids the addition of strong acids or alkalis, preventing the introduction of impurities and ensuring an economical and safe process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a top view of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of this utility model from below;

[0018] Figure 4 This is a schematic diagram of the pre-coated filter assembly structure of this utility model;

[0019] Figure 5 This is a process flow diagram of the present invention.

[0020] In the diagram: 1. Tank body; 2. Support leg; 3. Cooling component; 31. Spiral coil; 32. Coil inlet; 33. Coil outlet; 4. Stirring component; 41. Motor; 42. Stirring blade; 43. Stirring shaft; 5. Pre-coated filter component; 51. Connecting pipe; 52. Outer shell; 53. Discharge pipe; 54. Filter cloth plate; 55. Diatomaceous earth; 56. Bolt; 6. Observation port; 7. Oil inlet pipe; 8. Temperature sensor; 9. Return port; 10. Slag discharge port. Detailed Implementation

[0021] Please see Figures 1-5 A device for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil includes a tank 1. A cooling component 3 is provided on the inner wall of the tank 1. The cooling component 3 includes a spiral coil 31, which is installed on the inner wall of the tank 1. The lower end of the tank 1 is connected to a coil inlet 32, and the upper end of the spiral coil 31 is connected to a coil outlet 33. A stirring component 4 is provided on the top of the tank 1. The stirring component 4 includes a motor 41, which is fixedly installed at the center of the top. A stirring shaft 43 is fixedly installed on the output shaft of the motor 41. A stirring blade 42 is fixedly sleeved on the surface of the stirring shaft 43. An observation port 6 is connected to the top of the left side of the tank 1. An oil inlet pipe 7, a temperature sensor 8, and a return port 9 are respectively installed on the top of the tank 1. A pre-coated filter component 5 is provided at the bottom of the tank 1.

[0022] Support legs 2 are fixedly installed at the bottom of tank 1, and slag discharge ports 10 are installed on both the front and rear sides of the bottom of tank 1.

[0023] The pre-coated filter assembly 5 includes a connecting pipe 51, which is connected to the bottom of the tank 1. The bottom of the connecting pipe 51 is connected to a housing 52, and the bottom of the housing 52 is connected to a discharge pipe 53.

[0024] A filter cloth plate 54 is provided through the inner cavity of the outer shell 52. The top of the filter cloth plate 54 is coated with diatomaceous earth 55. The diatomaceous earth 55 + filter cloth plate 54 enhances the retention capacity of micron-sized waxes / phospholipids and extends the filter paper life. The right side of the filter cloth plate 54 extends through to the right side of the outer shell 52. A bolt 56 is provided through the top of the surface of the filter cloth plate 54. The bolt 56 is threadedly connected to the top of the outer shell 52.

[0025] A plate and frame filter is installed at the top of the oil inlet pipe 7, and the feed end of the plate and frame filter is connected to the raw material tank through an oil pump.

[0026] The inlet end of the coil inlet 32 ​​is connected to a temperature control system, and the outlet end of the temperature control system is connected to the return port 9;

[0027] The bottom of the pre-coated filter assembly 5 is connected to a diaphragm filter via an oil pump 2, and the outlet of the diaphragm filter is connected to a finished oil tank via an oil pump 3.

[0028] The spiral coil 31, filter cloth plate 54, and slag discharge port 10 can all be disassembled and cleaned to meet the needs of different oil processing.

[0029] The tank body is made of single-layer food-grade 304 stainless steel. The upper part is cylindrical and the bottom is conical. The tank capacity is 5 to 10 tons.

[0030] The temperature control system circulates ethylene glycol solution into the spiral coil 31, with antifreeze (such as propylene glycol) added to the ethylene glycol solution to prevent the medium from freezing at -10℃. It regulates the temperature of tank 1 to achieve three-level temperature control (7℃~8℃, 0℃~5℃, -8℃~-10℃). The sediment can be disassembled for cleaning. The temperature control system integrates temperature sensor 8 and PLC controller to achieve real-time monitoring and automatic adjustment. The ethylene glycol flow rate is adjusted in real time through feedback from temperature sensor 8 to avoid temperature fluctuations affecting the crystallization effect.

[0031] The stirring assembly 4 is driven by the motor 41 to rotate the stirring blades 42, directly agitating the oil and uniformly heating the oil. The conical bottom of the tank connects to the oil outlet, with the bottom of the cone tilted at a 45° angle. Gravity is used to guide the flow of oil, reducing oil residue to as low as 0.5% to 2% of the total capacity (5% to 10% for flat-bottomed tanks). The tilted design prevents impurities from accumulating at the bottom. Combined with the position of the oil outlet, it facilitates regular drainage or cleaning. At the same time, the oil is concentrated in the discharge pipe 53 at the bottom of the cone, reducing the risk of dry suction in the oil suction pipe and improving pumping efficiency.

[0032] In use, 1. The raw material is pumped out of the raw material tank by oil pump one. The crude rapeseed oil is filtered to remove impurities by a plate and frame filter press and enters tank 1 through oil inlet pipe 7. It is cooled to 7℃~8℃, and the stirring speed is controlled at 12~15rpm. After 7~8h, the wax is initially precipitated. Then it is cooled to 0℃~5℃, and the stirring speed is controlled at 10~12rpm. After 8~10h, the phospholipid is precipitated. It is further cooled to -8~-10℃, and the stirring speed is controlled at 6~8rpm. After 4~6h, the saturated fatty acids are precipitated. Finally, all the precipitates are filtered and separated by a diaphragm filter press with a filter paper weight of 300~500g / m2. The filtered oil is then transported to the finished oil tank by oil pump three.

[0033] 2. Introduce a 7-8°C ethylene glycol solution into the spiral coil 31 inside the tank 1. Slowly reduce the rapeseed oil temperature to 7-8°C, control the stirring speed at 12-15 rpm, and control the time at 7-8 hours. The wax will begin to precipitate.

[0034] 3. Introduce a 0-5°C ethylene glycol solution into the spiral coil 31 inside the tank 1, slowly cool it to 0-5°C, control the stirring speed at 10-12 rpm, and control the stirring time at 8-10 hours until phospholipids precipitate.

[0035] 4. Continue to introduce an ethylene glycol solution at -8℃ to -10℃ into the spiral coil 31 inside the tank 1, control the stirring speed at 6~8 rpm, and control the stirring time at 4~6 hours to precipitate saturated fatty acids.

[0036] 5. Finally, all precipitates are filtered and separated by a diaphragm filter with a filter paper weight of 300~500g / m2. The filtered oil is then transported to the finished oil tank.

[0037] In summary, the low-temperature dephosphorization, dewaxing, and degreasing device for pressed rapeseed oil, through the cooperation of tank 1, support leg 2, cooling component 3, stirring component 4, pre-coated filter component 5, observation port 6, oil inlet pipe 7, and temperature sensor 8, solves the problem of turbidity in pressed rapeseed oil during winter.

Claims

1. A device for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil, comprising a tank (1), characterized in that: The inner wall of the tank (1) is provided with a cooling component (3), the cooling component (3) includes a spiral coil (31), the spiral coil (31) is installed on the inner wall of the tank (1), the lower end of the tank (1) is connected to a coil inlet (32), the upper end of the spiral coil (31) is connected to a coil outlet (33), the top of the tank (1) is provided with a stirring component (4), the stirring component (4) includes a motor (41), the motor (41) is fixedly installed at the center of the top, the output shaft of the motor (41) is fixedly installed with a stirring shaft (43), the surface of the stirring shaft (43) is fixedly fitted with stirring blades (42), the top of the left side of the tank (1) is connected to an observation port (6), the top of the tank (1) is respectively equipped with an oil inlet pipe (7), a temperature sensor (8) and a return port (9), and the bottom of the tank (1) is provided with a pre-coated filter component (5).

2. The apparatus for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil according to claim 1, characterized in that: The bottom of the tank (1) is fixedly installed with support legs (2), and the front and rear sides of the bottom of the tank (1) are connected with slag discharge ports (10).

3. The apparatus for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil according to claim 1, characterized in that: The pre-coated filter assembly (5) includes a connecting pipe (51), which is connected to the bottom of the tank (1). The bottom of the connecting pipe (51) is connected to a shell (52), and the bottom of the shell (52) is connected to a discharge pipe (53).

4. The apparatus for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil according to claim 3, characterized in that: A filter cloth plate (54) is provided through the inner cavity of the outer shell (52). The top of the filter cloth plate (54) is coated with diatomaceous earth (55). The right side of the filter cloth plate (54) extends through to the right side of the outer shell (52). A bolt (56) is provided through the top of the surface of the filter cloth plate (54). The bolt (56) is threaded to the top of the outer shell (52).

5. The apparatus for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil according to claim 1, characterized in that: The top of the oil inlet pipe (7) is connected to a plate and frame filter, and the feed end of the plate and frame filter is connected to a raw material tank through an oil pump.

6. The apparatus for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil according to claim 1, characterized in that: The inlet of the coil (32) is connected to a temperature control system, and the outlet of the temperature control system is connected to the return port (9).

7. The apparatus for low-temperature dephosphorization, dewaxing, and degreasing of pressed rapeseed oil according to claim 1, characterized in that: The bottom of the pre-coated filter assembly (5) is connected to a diaphragm filter via an oil pump 2, and the outlet of the diaphragm filter is connected to a finished oil tank via an oil pump 3.

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