An extraction and purification system for low-molecular-weight linolenic acid flaxseed oil

Abstract

This invention provides a system for extracting and purifying high-linolenic acid, low-molecular-weight flaxseed oil, comprising a raw material pretreatment module, a cold-pressing oil extraction module, a filtration module, a degumming module, a decolorizing module, a deacidifying module, and a deodorizing module connected in sequence. The raw material pretreatment module is used to remove impurities and crush flaxseeds. The cold-pressing oil extraction module is used to press the crushed flaxseeds at low temperature to obtain crude oil. The filtration module is used to remove suspended impurities from the crude oil. The degumming module is used to remove phospholipid gums by heating and adding water. The decolorizing module is used to remove pigment impurities by physical adsorption. The deacidifying module is used to remove free fatty acids and low-molecular-weight impurities under high vacuum and low temperature conditions. The deodorizing module is used to remove off-odor components from the oil. This technical solution can press and purify flaxseed oil rich in high-linolenic acid.

Description

Technical Field

[0001] This invention relates to the field of oilseed pressing technology, specifically to an extraction and purification system for high-linolenic acid small-molecule flaxseed oil. Background Technology

[0002] Flaxseed oil is rich in linolenic acid and is a plant oil with high nutritional value. Current flaxseed oil extraction methods mostly employ high-temperature hot pressing or organic solvent extraction. While these processes are highly efficient at extracting oil, they easily cause oxidation or degradation of heat-sensitive components such as linolenic acid, thus reducing the nutritional value and health benefits of the finished oil. Furthermore, high-temperature processes may introduce off-odors or deactivate some active substances, making it difficult to meet the processing requirements for high-quality, functional plant oils.

[0003] Therefore, a system for extracting and purifying small molecule flaxseed oil with high linolenic acid is provided to address the above problems. Summary of the Invention

[0004] To address the problem that existing flaxseed oil extraction methods, which mostly employ high-temperature or solvent extraction, resulting in high oil extraction rates, easily lead to the oxidative degradation of active ingredients such as linolenic acid, thus affecting the nutritional value and quality of the oil, this invention provides a small-molecule flaxseed oil extraction and purification system with high linolenic acid content.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] This invention provides an extraction and purification system for high-linolenic acid small molecule flaxseed oil, comprising a raw material pretreatment module, a cold pressing oil extraction module, a filtration module, a degumming module, a decolorizing module, a deacidification module, and a deodorizing module connected in sequence.

[0007] The raw material pretreatment module is used to remove impurities and crush flaxseeds;

[0008] The cold-pressing oil extraction module is used to press crushed flaxseed at low temperatures to obtain crude oil.

[0009] The filter module is used to remove suspended impurities from crude oil;

[0010] The degumming module is used to remove phospholipid-based gums by heating and adding water;

[0011] The decolorization module is used to remove pigment impurities through physical adsorption.

[0012] The deacidification module is used to remove free fatty acids and low-molecular-weight impurities under high vacuum and low temperature conditions;

[0013] The deodorization module is used to remove odor components from grease.

[0014] By using a cold-pressing oil extraction module to extract crude oil, the linolenic acid content in flaxseed oil can be increased.

[0015] In this technical solution, the raw material pretreatment module includes a machine body, a feeding shell is provided on one side of the top of the machine body, and an air inlet is provided on the other side. A fan is connected to the air inlet, the fan is installed on the top side wall of the machine body, and an air guide pipe is connected to the air outlet of the fan.

[0016] An inclined guide plate is connected to the inner cavity side wall of the machine body located at the bottom of the feed shell. The end of the air guide pipe extends through the side wall of the machine body to the bottom of the guide plate and forms an air outlet at the bottom of the guide plate.

[0017] The bottom of the guide plate is provided with a first row of miscellaneous shells, a collection shell, and a second row of miscellaneous shells in sequence from one side to the other.

[0018] A magnetic separation component is provided on one side of the top of the guide plate, and the gap between the magnetic separation component and the guide plate is a feeding trough;

[0019] The two sides of the guide plate are fixed to the two opposite inner walls of the machine body.

[0020] A guide plate is installed between the first row of impurity shells and the aggregate shell. The guide plate is inclined to one side of the aggregate shell and guides the heavier impurities to the first row of impurity shells.

[0021] Start the blower and pour the raw material to be removed into the inner cavity of the machine through the feed shell. The raw material falls onto the guide plate and flows along the guide plate to the air outlet. The airflow from the air outlet blows on the falling raw material. Impurities heavier than the raw material particles fall into the first row of impurity shells closer to the machine, while the raw material particles fall into the collection shell in the middle. The lighter impurities are blown to the second row of impurity shells furthest away, thus completing the removal of impurities from the raw material.

[0022] During the impurity removal process, magnetic separation components are used to separate and remove magnetic impurities from the raw materials. This effectively removes mixed-in metal foreign objects such as iron filings and iron powder, preventing them from entering subsequent processing stages. This not only improves the impurity removal efficiency but also helps ensure the safe operation of the equipment and the purity of the product.

[0023] Specifically, the first row of debris shells and the collection shell are both formed by extending downward from the side wall at the bottom of the machine body. The bottom of the collection shell is connected to the discharge shell. The second row of debris shells is connected to the inner cavity of the machine body, and the second row has a debris discharge port at the bottom of the shell.

[0024] The first row of miscellaneous shells, the collection shell, and the second row of miscellaneous shells are arranged sequentially from one side of the guide plate to the far end.

[0025] Furthermore, the magnetic separation assembly includes a rotating drum, which is distributed along the width direction of the guide plate and located at the top of the guide plate. One end of the rotating drum is installed on the inner wall of the machine cavity, and the other end is connected to the output end of the drive motor through a connecting shaft.

[0026] The connecting shaft passes through the side wall of the machine body, and the drive motor is mounted on the outer wall of the machine body;

[0027] The inner cavity of the rotating cylinder is provided with a magnetic pole group that does not rotate synchronously with the rotating cylinder;

[0028] A collection shell is provided on one side of the rotating cylinder, overlapping its surface, and the collection shell is inclined.

[0029] Furthermore, a support rod is provided in the inner cavity of the rotating cylinder. The support rod coincides with the central axis of the rotating cylinder, and one end of the support rod passes through the circular side wall of the rotating cylinder and is fixedly connected to the inner wall of the machine body.

[0030] The circular sidewall of the rotating cylinder rotates on the supporting rod, and the other end of the supporting rod is connected to the inner wall of another circular sidewall of the rotating cylinder, and can rotate on the circular sidewall.

[0031] A magnetic pole assembly is fixed on the support rod, and the magnetic pole assembly is located on the side near the guide plate.

[0032] Two bearings are fitted onto the support rod. One bearing is fixed on the inner wall of the circular sidewall, and the other bearing is fixed on the through hole at the center of the corresponding circular sidewall.

[0033] It also includes a combing assembly, which is disposed on the top side of the magnetic separator and located on the top of the guide plate. The combing assembly and the magnetic separator are connected to each other by a transmission assembly.

[0034] The combing assembly includes a mounting shaft, which is arranged parallel to the rotating drum on the magnetic separation assembly. One end of the mounting shaft is mounted on the inner wall of the machine body and rotates on the inner wall of the machine body. The other end of the mounting shaft is connected to the transmission assembly.

[0035] The surface of the mounting shaft is fixed with multiple evenly distributed comb sections.

[0036] The transmission assembly includes a drive gear and a driven gear. The drive gear is mounted on the connecting shaft of the drive motor, and the driven gear is fixed on one end of the mounting shaft that passes through the side wall of the machine body. The driven gear is mounted on the outer wall of the machine body.

[0037] The driving gear and the driven gear are meshed together.

[0038] The drive motor drives the drive gear to rotate, which in turn drives the driven gear to rotate, thereby driving the entire comb assembly to operate.

[0039] The combing part includes a connecting block, which is fixed on the outer wall of the mounting shaft, and a combing component is fixed on the connecting block;

[0040] The comb section is also equipped with a push section.

[0041] The driven gear drives the mounting shaft to rotate, which in turn drives the comb component on the mounting shaft to rotate. The raw material on the comb guide plate is then guided through the rotating comb component.

[0042] The comb component is hook-shaped or rod-shaped.

[0043] The pusher section includes a guide rod, which is distributed along the arc surface of the mounting shaft in a direction tangential to or parallel to the tangential direction. The guide rod is fixed on the comb or connecting block, and a pusher plate perpendicular to it is fixed at the end of the guide rod.

[0044] The guide rod is telescopic, and a spring is sleeved on the surface of the guide rod, with the two ends of the spring fixed to the two ends of the guide rod respectively;

[0045] Extension units are provided on both sides of the guide rod.

[0046] The extension unit includes an inclined transmission rod, one end of which is rotatably connected to the connection between the guide rod and the pusher plate, and the other end is rotatably connected to the slider. The slider is slidably connected to the guide rail, and the guide rail is fixed to the connecting block or the combing component by a connecting rod.

[0047] The slider is fixedly connected to the moving plate via a driven rod, and the moving plate and the pusher plate are arranged in parallel.

[0048] The guide rail is arranged parallel to the pusher plate and perpendicular to the guide rod.

[0049] When too much raw material accumulates on the guide plate, the pusher plate, which rotates with the mounting shaft, is pushed by the weight of the raw material, causing the guide rod to retract. The retraction of the guide rod pushes the slider on the end of the transmission rod to slide outward on the guide rail, thereby causing the moving plate to slide outward, expanding the contact area between the pusher and the raw material, thus pushing more raw material to a higher position, avoiding blockage of the trough and excessive raw material passing through the trough, which would lead to incomplete screening.

[0050] A method for extracting and purifying low-molecule flaxseed oil with high linolenic acid, the steps of which are as follows:

[0051] Step 1: Impurity Removal Process

[0052] The raw flaxseeds are initially cleaned to remove impurities;

[0053] Step 2: Pressing or Extraction

[0054] After cleaning, the flaxseeds are crushed and then pressed using a cold pressing method.

[0055] The resulting crude oil is dark and cloudy, containing phospholipids, pigments, free fatty acids, and wax impurities.

[0056] Step 3: Filtering

[0057] The crude oil obtained from the initial extraction is physically filtered by vacuum filtration or centrifugation to remove large particulate matter, some phospholipids and colloidal matter.

[0058] Step 4: Degumming

[0059] Heat the filtered oil to 60-70℃, add deionized water or 0.05-0.2% phosphoric acid / citric acid solution for hydration degumming;

[0060] After stirring and reacting for 10-20 minutes, allow the mixture to stand and separate into layers or centrifuge to remove the resulting colloidal precipitate.

[0061] Step 5: Decolorization treatment

[0062] Activated clay is added to the degummed oil to adsorb natural pigments and trace amounts of lithium metal in the oil. After adsorption is complete, the clay is removed by vacuum filtration.

[0063] Step Six: Deacidification Treatment

[0064] Free fatty acids are removed using physical deacidification methods;

[0065] Physical method (molecular distillation): Under high vacuum (15 Pa) conditions, short-path distillation is carried out in the range of 140-180℃, and low-boiling-point free fatty acids, small molecule oxidation products, etc. are effectively separated.

[0066] Step 7: Deodorization treatment

[0067] Vacuum distillation is used to deodorize oils, primarily removing volatile, low-molecular-weight odor substances such as aldehydes and ketones.

[0068] Under high vacuum conditions of 0.1~1 kPa;

[0069] Temperature should be controlled between 180 and 210℃;

[0070] Introduce steam and process for 30-60 minutes;

[0071] After processing, quickly cool to room temperature and seal for storage.

[0072] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0073] The positive and progressive effects of this invention are as follows:

[0074] By using a cold-pressing oil extraction module to press flaxseed at low temperatures, crude oil can be effectively extracted without the destruction of active ingredients by high temperatures. This process improves the retention rate of alpha-linolenic acid in flaxseed oil, thereby increasing the linolenic acid content and nutritional value of the finished oil. Compared to traditional hot-pressing processes, this method significantly reduces the oxidation and thermal degradation of linolenic acid, which is beneficial for obtaining high-quality functional plant oils. Attached Figure Description

[0075] Figure 1 This is a schematic diagram of the external structure of the raw material pretreatment module of the present invention;

[0076] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the local structure at point I;

[0077] Figure 3 For the present invention Figure 1 A schematic diagram of the structure viewed from below;

[0078] Figure 4 For the present invention Figure 1 A structural diagram from another perspective;

[0079] Figure 5 For the present invention Figure 1 A top-view structural diagram;

[0080] Figure 6 For the present invention Figure 5 A schematic diagram of the three-dimensional cross-sectional structure at point AA;

[0081] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point J;

[0082] Figure 8 For the present invention Figure 5 A schematic diagram of the cross-sectional planar structure at point AA;

[0083] Figure 9 This is a schematic diagram of the connection structure of the magnetic separation component, the combing component, and the transmission component of the present invention;

[0084] Figure 10 This is a three-dimensional structural diagram of the comb section of the present invention;

[0085] Figure 11 For the present invention Figure 10 A structural diagram from another perspective.

[0086] 1. Machine body; 11. Feed shell; 12. First row of waste shell; 13. Collection shell; 131. Discharge shell; 14. Second row of waste shell; 141. Waste discharge port;

[0087] 2. Air intake end;

[0088] 3. Fan; 31. Air duct; 32. Air outlet;

[0089] 4. Guide board;

[0090] 5. Guide plate;

[0091] 6. Magnetic separation assembly; 61. Rotating drum; 62. Drive motor; 63. Support rod; 64. Magnetic pole assembly; 65. Collection shell; 66. Discharge shell;

[0092] 7. Combing assembly; 71. Mounting shaft; 72. Combing section; 721. Connecting block; 722. Combing component; 73. Pushing section; 731. Guide rod; 732. Pushing plate; 733. Transmission rod; 734. Slider; 735. Guide rail; 736. Driven rod; 737. Moving plate;

[0093] 8. Transmission components; 81. Drive gear; 82. Driven gear. Detailed Implementation

[0094] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0095] A system for extracting and purifying small-molecule flaxseed oil with high linolenic acid includes a raw material pretreatment module, a cold pressing oil extraction module, a filtration module, a degumming module, a decolorizing module, a deacidification module, and a deodorizing module connected in sequence.

[0096] The raw material pretreatment module is used to remove impurities and crush flaxseeds;

[0097] The cold-pressing oil extraction module is used to press crushed flaxseed at low temperatures to obtain crude oil.

[0098] The filter module is used to remove suspended impurities from crude oil;

[0099] The degumming module is used to remove phospholipid-based gums by heating and adding water;

[0100] The decolorization module is used to remove pigment impurities through physical adsorption.

[0101] The deacidification module is used to remove free fatty acids and low-molecular-weight impurities under high vacuum and low temperature conditions;

[0102] The deodorization module is used to remove odor components from grease.

[0103] The cold-pressing oil extraction module includes a low-temperature screw press and a temperature control system, which is used to press crushed flaxseed under low-temperature conditions to obtain crude oil.

[0104] The filtration module, including a vacuum filter or a high-speed centrifuge, is used to remove suspended impurities from crude oil.

[0105] The degumming module includes a heated mixing tank, a water injection system, and a centrifuge, and is used to remove phospholipid gums by heating and adding water.

[0106] The decolorization module includes an activated clay adsorption tank, a clay dosing device, and a clay filter, which are used to remove pigment impurities through physical adsorption.

[0107] The deacidification module is a molecular distillation device, specifically including a thin-film evaporator, a condenser, a vacuum pump system, and a collection device, used to remove free fatty acids and low-molecular-weight impurities under high vacuum and low temperature conditions.

[0108] The deodorization module includes a vacuum deodorization tower, a steam generator, and a condensation vacuum system, used to remove odor components from greases.

[0109] The cooling and packaging module includes a cooler and a filling and sealing machine, which are used to cool the deodorized oil and package the finished oil.

[0110] like Figure 1 As shown, the raw material pretreatment module includes a body 1. A feed shell 11 is provided on one side of the top of the body 1, and an air inlet 2 is provided on the other side. A fan 3 is connected to the air inlet 2. The fan 3 is installed on the top side wall of the body 1, and an air duct 31 is connected to the air outlet of the fan 3.

[0111] An inclined guide plate 5 is connected to the inner wall of the machine body 1 located at the bottom of the feed shell 11. The end of the air duct 31 extends through the side wall of the machine body 1 to the bottom of the guide plate 5, and forms an air outlet 32 ​​at the bottom of the guide plate 5.

[0112] The bottom of the guide plate 5 is provided with a first row of miscellaneous shells 12, a collection shell 13 and a second row of miscellaneous shells 14 in sequence from one side to the other.

[0113] A magnetic separation component 6 is provided on one side of the top of the guide plate 5, and the gap between the magnetic separation component 6 and the guide plate 5 is a feeding trough;

[0114] The two sides of the guide plate 5 are respectively fixed to the two opposite inner walls of the machine body 1.

[0115] A guide plate 4 is provided between the first row of impurity shells 12 and the collection shell 13. The guide plate 4 is inclined towards one side of the collection shell 13, and guides the heavier impurities to the first row of impurity shells 12.

[0116] Start the blower 3 and pour the raw material to be removed into the inner cavity of the machine body 1 through the feed shell 11. The raw material entering the inner cavity of the machine body 1 falls onto the guide plate 5 and flows along the guide plate to the air outlet 32. The airflow from the air outlet 32 ​​blows onto the falling raw material. Impurities heavier than the raw material particles fall into the first row of impurity shells 12, which are closer to the raw material. The raw material particles fall into the collection shell 13 in the middle position. The lighter impurities are blown to the second row of impurity shells 14, which are furthest away, thus completing the removal of impurities from the raw material.

[0117] During the impurity removal process, the magnetic separation component 6 is set up to separate and remove magnetic impurities in the raw materials. This effectively removes mixed-in metal foreign objects such as iron filings and iron powder, preventing them from entering subsequent processing stages. This not only improves the impurity removal efficiency but also helps ensure the safe operation of the equipment and the purity of the product.

[0118] like Figure 6 As shown, the first impurity shell 12 and the collection shell 13 are both formed by extending downward from the side wall of the bottom of the machine body 1. The bottom of the collection shell 13 is connected to the discharge shell 131. The second impurity shell 14 is connected to the inner cavity of the machine body 1, and the second impurity shell 14 has an impurity discharge port 141 at the bottom of the shell.

[0119] The first row of miscellaneous shells 12, the collection shell 13, and the second row of miscellaneous shells 14 are arranged sequentially from one side of the guide plate 5 to the far end.

[0120] like Figure 8 As shown, the magnetic separation assembly 6 includes a rotating drum 61, which is distributed along the width direction of the guide plate 5 and located at the top of the guide plate 5. One end of the rotating drum 61 is installed on the inner wall of the machine body 1, and the other end is connected to the output end of the drive motor 62 through a connecting shaft.

[0121] The connecting shaft passes through the side wall of the body 1, and the drive motor 62 is mounted on the outer wall of the body 1;

[0122] The inner cavity of the rotating cylinder 61 is provided with a magnetic pole group 64 that does not rotate synchronously with the rotating cylinder 61;

[0123] A collection shell 65 is provided on one side of the rotating cylinder 61, which overlaps with its surface, and the collection shell 65 is inclined.

[0124] Specifically, a support rod 63 is provided in the inner cavity of the rotating cylinder 61. The support rod 63 coincides with the central axis of the rotating cylinder 61, and one end of the support rod 63 passes through the circular side wall of the rotating cylinder 61 and is fixedly connected to the inner wall of the machine body 1.

[0125] The circular sidewall of the rotating cylinder 61 rotates on the support rod 63. The other end of the support rod 63 is connected to the inner wall of another circular sidewall of the rotating cylinder 61 and can rotate on the circular sidewall.

[0126] A magnetic pole assembly 64 is fixed on the bearing rod 63, and the magnetic pole assembly 64 is arranged on the side close to the guide plate 5.

[0127] Two bearings are fitted onto the support rod 63. One bearing is fixed on the inner wall of the circular sidewall, and the other bearing is fixed on the through hole at the center of the corresponding circular sidewall.

[0128] The drive motor 62 drives the rotating drum 61 to rotate via the connecting shaft, while the bearing rod 63 does not rotate. When the raw material moves on the guide plate 5, the magnetic impurities are attracted to the surface of the rotating drum 61 by the magnetic force of the magnetic pole group 64. When the rotating drum 61 reaches the collection shell 65, the magnetic impurities are scraped off by the collection shell 65, thus completing the screening of magnetic impurities.

[0129] The lower side of the collection shell 65 penetrates the side wall of the body 1 and is connected to the discharge shell 66, which is fixed to the outer wall of the body 1.

[0130] like Figures 9-11 As shown, it also includes a combing assembly 7, which is disposed on the top side of the magnetic separator 6 and located on the top of the guide plate. The combing assembly 7 and the magnetic separator 6 are connected to each other by a transmission assembly 8.

[0131] The combing assembly 7 includes a mounting shaft 71, which is arranged parallel to the rotating drum 61 on the magnetic separation assembly 6. One end of the mounting shaft 71 is mounted on the inner wall of the machine body 1 and rotates on the inner wall of the machine body 1. The other end of the mounting shaft 71 is connected to the transmission assembly 8.

[0132] The surface of the mounting shaft 71 is fixed with a plurality of evenly distributed comb sections 72.

[0133] Specifically, the transmission assembly 8 includes a drive gear 81 and a driven gear 82. The drive gear 81 is mounted on the connecting shaft of the drive motor 62, and the driven gear 82 is fixed on one end of the mounting shaft 71 that passes through the side wall of the machine body 1. The driven gear 82 is mounted on the outer wall of the machine body 1.

[0134] The driving gear 81 and the driven gear 82 are meshed together.

[0135] The drive motor 62 drives the drive gear 81 to rotate, and the drive gear 81 drives the driven gear 82 to rotate, thereby driving the entire comb assembly 7 to run.

[0136] The combing part 72 includes a connecting block 721, which is fixed on the outer wall of the mounting shaft 71, and a combing component 722 is fixed on the connecting block 721.

[0137] The combing section 72 is also provided with a pushing section 73.

[0138] Driven gear 82 drives mounting shaft 71 to rotate, thereby driving comb component 722 on mounting shaft 71 to rotate. Through the rotating comb component 722, the raw material on comb guide plate 5 is transported.

[0139] The comb component 722 is hook-shaped or rod-shaped.

[0140] like Figure 10 As shown, the pusher part 73 includes a guide rod 731. The guide rod 731 is distributed along the arc surface of the mounting shaft 71 in a direction tangential to or parallel to the tangential direction. The guide rod 731 is fixed on the comb part 722 or the connecting block 721. A pusher plate 732 is fixed at the end of the guide rod 731 and is arranged perpendicular to it.

[0141] The guide rod 731 is telescopic, and a spring is sleeved on the surface of the guide rod 731, with the two ends of the spring respectively fixed to the two ends of the guide rod 731;

[0142] Extension units are provided on both sides of the guide rod 731.

[0143] The extension unit includes an inclined transmission rod 733. One end of the transmission rod 733 is rotatably connected to the connection between the guide rod 731 and the pusher plate 732, and the other end is rotatably connected to the slider 734. The slider 734 is slidably connected to the guide rail 735. The guide rail 735 is fixed to the connecting block 721 or the comb component 722 by a connecting rod.

[0144] The slider 734 is fixedly connected to the moving plate 737 via the driven rod 736, and the moving plate 737 and the pusher plate 732 are arranged in parallel.

[0145] The guide rail 735 is arranged parallel to the pusher plate 732 and perpendicular to the guide rod 731.

[0146] When too much raw material accumulates on the guide plate 5, the pusher plate 732, which rotates with the mounting shaft 71, will be pushed by the gravity of the raw material, causing the guide rod 731 to retract. The retraction of the guide rod 731 pushes the slider 734 on the end of the transmission rod 733 to slide outward on the guide rail 735, thereby driving the moving plate 737 to slide outward, expanding the contact area between the pusher part 73 and the raw material, thus pushing more raw material to a higher position, avoiding blockage of the trough and excessive raw material passing through the trough, which would lead to incomplete screening.

[0147] A method for extracting and purifying low-molecule flaxseed oil with high linolenic acid, the steps of which are as follows:

[0148] Step 1: Impurity Removal Process

[0149] The raw flaxseeds are initially cleaned to remove impurities;

[0150] Step 2: Pressing or Extraction

[0151] After cleaning, the flaxseeds are crushed and then pressed using a cold pressing method.

[0152] The resulting crude oil is dark and cloudy, containing phospholipids, pigments, free fatty acids, and wax impurities.

[0153] Step 3: Filtering

[0154] The crude oil obtained from the initial extraction is physically filtered by vacuum filtration or centrifugation to remove large particulate matter, some phospholipids and colloidal matter.

[0155] Step 4: Degumming

[0156] Heat the filtered oil to 60-70℃, add deionized water or 0.05-0.2% phosphoric acid / citric acid solution for hydration degumming;

[0157] After stirring and reacting for 10-20 minutes, allow the mixture to stand and separate into layers or centrifuge to remove the resulting colloidal precipitate.

[0158] Step 5: Decolorization treatment

[0159] Activated clay is added to the degummed oil to adsorb natural pigments and trace amounts of lithium metal in the oil. After adsorption is complete, the clay is removed by vacuum filtration.

[0160] Step Six: Deacidification Treatment

[0161] Free fatty acids are removed using physical deacidification methods;

[0162] Physical method (molecular distillation): Under high vacuum (15 Pa) conditions, short-path distillation is carried out in the range of 140-180℃, and low-boiling-point free fatty acids, small molecule oxidation products, etc. are effectively separated.

[0163] Step 7: Deodorization treatment

[0164] Vacuum distillation is used to deodorize oils, primarily removing volatile, low-molecular-weight odor substances such as aldehydes and ketones.

[0165] Under high vacuum conditions of 0.1~1 kPa;

[0166] Temperature should be controlled between 180 and 210℃;

[0167] Introduce steam and process for 30-60 minutes;

[0168] After processing, quickly cool to room temperature and seal for storage.

[0169] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A system for extraction and purification of small molecule flaxseed oil with high linolenic acid, characterized by: It includes a raw material pretreatment module, a cold pressing oil extraction module, a filtration module, a degumming module, a decolorizing module, a deacidification module, and a deodorization module connected in sequence; The raw material pretreatment module is used to remove impurities and crush flaxseeds; The cold-pressing oil extraction module is used to press crushed flaxseed at low temperatures to obtain crude oil. The filter module is used to remove suspended impurities from crude oil; The degumming module is used to remove phospholipid-based gums by heating and adding water; The decolorization module is used to remove pigment impurities through physical adsorption. The deacidification module is used to remove free fatty acids and low-molecular-weight impurities under high vacuum and low temperature conditions; The deodorization module is used to remove odor components from greases; The raw material pretreatment module includes a body (1), a feed shell (11) is provided on one side of the top of the body (1), and an air inlet (2) is provided on the other side. A fan (3) is connected to the air inlet (2), and an air duct (31) is connected to the air outlet of the fan (3). An inclined guide plate (5) is connected to the inner wall of the machine body (1) at the bottom of the feed shell (11). The end of the air duct (31) extends through the side wall of the machine body (1) to the bottom of the guide plate (5) and forms an air outlet (32) at the bottom of the guide plate (5). The bottom of the guide plate (5) is provided with a first row of miscellaneous shells (12), a collection shell (13), and a second row of miscellaneous shells (14) in sequence from one side to the other. A magnetic separation component (6) is provided on one side of the top of the guide plate (5), and the gap between the magnetic separation component (6) and the guide plate (5) is a feeding trough; The magnetic separation assembly (6) includes a rotating drum (61), which is distributed along the width direction of the guide plate (5) and located at the top of the guide plate (5). One end of the rotating drum (61) is installed on the inner wall of the machine body (1), and the other end is connected to the output end of the drive motor (62) through a connecting shaft. The connecting shaft passes through the side wall of the body (1), and the drive motor (62) is mounted on the outer wall of the body (1); The inner cavity of the rotating cylinder (61) is provided with a magnetic pole group (64) that does not rotate synchronously with the rotating cylinder (61). A collection shell (65) is provided on one side of the rotating cylinder (61) and overlaps with its surface, and the collection shell (65) is inclined. A bearing rod (63) is provided in the inner cavity of the rotating cylinder (61). The bearing rod (63) coincides with the central axis of the rotating cylinder (61). One end of the bearing rod (63) passes through the circular side wall of the rotating cylinder (61) and is fixedly connected to the inner wall of the machine body (1). The circular sidewall of the rotating cylinder (61) rotates on the bearing rod (63), and the other end of the bearing rod (63) is connected to the inner wall of another circular sidewall of the rotating cylinder (61), and can rotate on the circular sidewall; A magnetic pole group (64) is fixed on the bearing rod (63), and the magnetic pole group (64) is set on the side close to the guide plate (5); It also includes a combing assembly (7), which is disposed on the top side of the magnetic separation assembly (6) and located on the top of the guide plate. The combing assembly (7) and the magnetic separation assembly (6) are connected to each other by a transmission assembly (8). The combing assembly (7) includes a mounting shaft (71), which is arranged parallel to the rotating drum (61) on the magnetic separation assembly (6). One end of the mounting shaft (71) is mounted on the inner wall of the machine body (1), and the other end of the mounting shaft (71) is connected to the transmission assembly (8). The surface of the mounting shaft (71) is fixed with a plurality of evenly distributed comb sections (72); The transmission assembly (8) includes a drive gear (81) and a driven gear (82). The drive gear (81) is mounted on the connecting shaft of the drive motor (62). The driven gear (82) is fixed on one end of the mounting shaft (71) that passes through the side wall of the machine body (1). The driven gear (82) is mounted on the outer wall of the machine body (1). The drive gear (81) and the driven gear (82) are meshed together; The combing part (72) includes a connecting block (721), which is fixed on the outer wall of the mounting shaft (71), and a combing component (722) is fixed on the connecting block (721). The comb section (72) is also provided with a push section (73); The pusher part (73) includes a guide rod (731), which is distributed along the arc surface of the mounting shaft (71) in a direction tangential to or parallel to the tangential direction. The guide rod (731) is fixed on the comb (722) or the connecting block (721), and a pusher plate (732) is fixed at the end of the guide rod (731) perpendicular to it. The guide rod (731) is telescopic, and a spring is sleeved on the surface of the guide rod (731), with the two ends of the spring respectively fixed to the two ends of the guide rod (731); Extension units are provided on both sides of the guide rod (731).

Images