Method for extracting sesame oil through low-temperature cold pressing
By employing steps such as wind blowing, vibration screening, hot air drying, spiral pressing, supercritical extraction, and ultraviolet irradiation, the problem of incomplete sesame oil extraction in existing technologies has been solved, resulting in more efficient sesame oil production and purity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 吴保森
- Filing Date
- 2023-05-25
- Publication Date
- 2026-04-21
AI Technical Summary
Existing low-temperature cold pressing methods for extracting sesame oil cannot fully extract the oil components from sesame seeds, resulting in a large amount of oil remaining in the sesame residue, which affects the yield of sesame oil.
Through steps such as wind blowing, vibration screening, hot air drying, spiral pressing, supercritical extraction, and ultraviolet irradiation, impurities and residual oil in sesame seeds are removed to improve the purity of sesame seeds. The sesame residue is then processed through vacuum drying and ultra-microfiltration to obtain more sesame oil.
This increases the yield of sesame oil, ensuring that more edible sesame oil can be extracted from the same amount of sesame seeds, thus improving the extraction efficiency and purity of sesame oil.
Smart Images
Figure CN121896033A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of sesame oil extraction technology, specifically a method for low-temperature cold pressing extraction of sesame oil. Background Technology
[0002] Sesame, also known as sesame, belongs to the Pyrrosia family. It is an annual herbaceous plant and an ancient oil crop. It is also one of the four major edible oil crops in my country. Currently, the sesame oil consumed by people is made by cold pressing sesame seeds at low temperature.
[0003] Existing methods for extracting sesame oil using low-temperature cold pressing produce a certain amount of sesame residue, which may still contain a small amount of oil. This means that when sesame is cold-pressed at low temperatures using a screw press, the oil content cannot be fully extracted, thus making it difficult to increase sesame oil yield.
[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and proposed a method for low-temperature cold pressing extraction of sesame oil. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a method for low-temperature cold pressing and extraction of sesame oil, which solves the problems mentioned in the background section.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for low-temperature cold pressing extraction of sesame oil, wherein the method comprises the following steps:
[0007] S1. Impurity removal:
[0008] A conveyor belt is installed above the receiving hopper. The conveyor belt is used to evenly transport sesame seeds to the top of the receiving hopper. The sesame seeds fall into the receiving hopper due to gravity. At the same time as the sesame seeds fall, a fan is installed between the receiving hopper and the conveyor belt. The fan's wind power is used to blow away the sesame seeds during the falling process, so as to blow away light impurities such as dust and sesame skin contained in the sesame seeds.
[0009] The receiving hopper vibrates via a vibrating motor, and a screening machine is connected to the bottom of the receiving hopper. The screening machine separates large impurities based on their size. Then, the sesame seeds enter the destoner, which separates impurities such as stones, which are heavier than sesame seeds, based on their specific gravity. Finally, the sesame seeds enter the magnetic funnel, which separates magnetic sand and gravel from the sesame seeds, thus obtaining pure sesame seeds.
[0010] S2. Drying treatment:
[0011] After cleaning the impurities, the sesame seeds are placed in a drying room and dried with hot air to remove the moisture. During the drying process, a rotating shovel is used to lift and shake the sesame seeds, which are then scattered into the air and fall. During the falling process, the sesame seeds are evenly dried by the hot air.
[0012] S3, Low-temperature cold pressing:
[0013] The dried sesame seeds are put into a screw press for oil extraction. The screw speed is controlled at 40 revolutions per minute. The sesame seed feed temperature is 5-35 degrees Celsius, and the oil output temperature is 45-50 degrees Celsius.
[0014] S4. Sedimentation and filtration:
[0015] After the sesame oil is extracted, it is allowed to settle, and then finely filtered to obtain edible sesame oil.
[0016] S5. Sesame residue treatment:
[0017] After the screw press extracts oil from sesame seeds, it produces sesame residue. The sesame residue is placed in a vacuum environment for natural drying. After drying, the sesame residue is crushed and sieved through a 20-40 mesh screen.
[0018] S6, Supercritical Extraction:
[0019] The sieved sesame residue was subjected to supercritical CO2 extraction at a fluid extraction pressure of 35-45 MPa and an extraction temperature of 35-45 degrees Celsius to obtain crude sesame oil.
[0020] S7, Ultrafiltration Treatment:
[0021] The crude sesame oil is treated with an ultra-microfiltration membrane, and the filtered crude sesame oil is then irradiated with ultraviolet light.
[0022] Furthermore, in step S1, the height at which the sesame seeds fall from the conveyor belt into the receiving hopper is controlled at 1-2 meters.
[0023] Furthermore, in step S1, there are two destoners, and the two destoners are connected in series, meaning that sesame seeds need to pass through two destoners continuously for impurity separation.
[0024] Furthermore, in step S2, the moisture content of the sesame seeds is controlled at 5wt%-7wt%, and the temperature of the sesame seeds in the drying chamber is controlled at 35-40 degrees Celsius.
[0025] Furthermore, in step S2, the rotatable shovel moves back and forth inside the drying chamber to continuously scoop up and shake off the sesame seeds, and the time interval between each movement of the shovel is controlled at 0.5-1 minute.
[0026] Furthermore, in step S4, the fine filtration of sesame oil must be carried out at a temperature of 20-40 degrees Celsius.
[0027] Furthermore, in step S5, the temperature of the vacuum environment is controlled at 40-60 degrees Celsius, and the drying time is 2-7 hours.
[0028] Furthermore, in step S6, the fluid flow rate is 800-1100L per hour, and the extraction time is 40-100 minutes.
[0029] Furthermore, in step S7, the ultrafiltration membrane is selected with a molecular weight cutoff of 80-120kD, the ultraviolet lamp irradiation dose is 300-400J per square meter, and the irradiation time is 10-20 seconds.
[0030] This invention provides a method for low-temperature cold pressing extraction of sesame oil, which has the following beneficial effects:
[0031] This low-temperature cold-pressing method for extracting sesame oil removes light impurities from sesame seeds during pretreatment by allowing them to fall naturally and be blown by airflow. Then, a series of destoners removes heavier impurities to the greatest extent possible, thereby improving the purity of the sesame seeds. During the drying process, the sesame seeds are turned and shaken to ensure even heating, which improves the uniformity of moisture control and thus enhances the quality of the sesame seeds.
[0032] This low-temperature cold-pressing method for extracting sesame oil involves cold-pressing sesame seeds using a screw press, which produces sesame oil and sesame residue. A small amount of oil remains in the residue. The residue is then collected and naturally dried under vacuum. Supercritical fluid extraction is then used to extract the crude sesame oil remaining in the residue. After filtration and irradiation with ultraviolet light, the crude sesame oil is also edible. This method allows for the extraction of more sesame oil from the same volume of sesame seeds, thereby increasing sesame oil production. Attached Figure Description
[0033] Figure 1 This is a schematic diagram of the overall process structure of a method for low-temperature cold pressing and extraction of sesame oil according to the present invention. Detailed Implementation
[0034] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.
[0035] like Figure 1 As shown, the present invention provides a technical solution: a method for low-temperature cold pressing extraction of sesame oil, the method comprising the following steps:
[0036] S1. Impurity removal:
[0037] A conveyor belt is installed above the receiving hopper to evenly transport sesame seeds to the top of the receiving hopper. The sesame seeds fall into the receiving hopper due to gravity. At the same time as the sesame seeds fall, a fan is installed between the receiving hopper and the conveyor belt to blow away the light impurities such as dust and sesame husks contained in the sesame seeds. The height of the sesame seeds falling from the conveyor belt to the receiving hopper is controlled at 1-2 meters.
[0038] The receiving hopper vibrates via a vibrating motor, and a screening machine is connected to the bottom of the receiving hopper. The screening machine separates large impurities based on their size. Then, the sesame seeds enter the destoner, which separates impurities such as stones, which are heavier than sesame seeds, based on their specific gravity. Finally, the sesame seeds enter the magnetic funnel, which separates magnetic sand and gravel from the sesame seeds, thus obtaining pure sesame seeds. There are two destoners, which are connected in series, meaning that the sesame seeds need to pass through two destoners continuously for impurity separation.
[0039] S2. Drying treatment:
[0040] After cleaning the impurities, the sesame seeds are placed in a drying chamber for hot air drying to remove moisture. The moisture content of the sesame seeds is controlled at 5wt%-7wt%, and the temperature of the sesame seeds in the drying chamber is controlled at 35-40 degrees Celsius. During the drying process, a rotating shovel is used to scoop up and shake the sesame seeds, thus scattering them into the air and letting them fall. During the falling process, the sesame seeds are evenly dried by the hot air. The rotating shovel also moves back and forth inside the drying chamber to continuously scoop up and shake the sesame seeds, and the time interval between each movement of the shovel is controlled at 0.5-1 minute.
[0041] In steps S1-S2, during the pretreatment of sesame seeds, light impurities are removed by natural falling airflow. Then, the series of destoners can remove heavier impurities to the greatest extent, thereby improving the purity of the sesame seeds. During the drying process, the sesame seeds are turned over and shaken to ensure even heating, thereby improving the uniformity of moisture control and thus improving the quality of the sesame seeds.
[0042] S3, Low-temperature cold pressing:
[0043] The dried sesame seeds are put into a screw press for oil extraction. The screw speed is controlled at 40 revolutions per minute. The sesame seed feed temperature is 5-35 degrees Celsius, and the oil output temperature is 45-50 degrees Celsius.
[0044] S4. Sedimentation and filtration:
[0045] After the sesame oil is extracted, it is allowed to settle, and then finely filtered to obtain edible sesame oil. The fine filtration of sesame oil must be carried out at a temperature of 20-40 degrees Celsius.
[0046] S5. Sesame residue treatment:
[0047] After the screw press extracts oil from sesame seeds, it produces sesame residue. The sesame residue is placed in a vacuum environment for natural drying. The temperature of the vacuum environment is controlled at 40-60 degrees Celsius, and the drying time is 2-7 hours. The dried sesame residue is then crushed and sieved through a 20-40 mesh screen. When finely filtering sesame oil, it is necessary to do so at a temperature of 20-40 degrees Celsius.
[0048] S6, Supercritical Extraction:
[0049] The sieved sesame residue was subjected to supercritical CO2 extraction at a fluid extraction pressure of 35-45 MPa and an extraction temperature of 35-45 degrees Celsius to obtain crude sesame oil. The fluid flow rate was 800-1100 L per hour and the extraction time was 40-100 minutes.
[0050] S7, Ultrafiltration Treatment:
[0051] The crude sesame oil is treated with an ultra-microfiltration membrane. The filtered crude sesame oil is then irradiated with ultraviolet light. The ultra-microfiltration membrane is selected with a molecular weight cutoff of 80-120kD. The ultraviolet light irradiation dose is 300-400J per square meter and the irradiation time is 10-20 seconds.
[0052] In steps S5-S7, when sesame seeds are cold-pressed at low temperature using a screw press, sesame oil and sesame residue are produced. A small amount of oil remains in the sesame residue. The sesame residue is then collected and naturally dried in a vacuum environment. The residue is then extracted using supercritical fluid extraction to obtain the crude sesame oil remaining in the residue. After filtration and irradiation with ultraviolet light, the crude sesame oil is also edible. Thus, more sesame oil can be obtained from the same volume of sesame seeds, thereby increasing the sesame oil yield.
[0053] Example 1:
[0054] A conveyor belt is installed above the receiving hopper to evenly transport sesame seeds to the top of the hopper. The sesame seeds fall into the receiving hopper due to gravity. At the same time as the sesame seeds fall, a fan is installed between the receiving hopper and the conveyor belt to blow away light impurities such as dust and sesame husks. The height of the sesame seeds falling from the conveyor belt to the receiving hopper is controlled at 1 meter. The receiving hopper is vibrated by a vibrating motor, and a screening machine is connected to the bottom of the receiving hopper. The screening machine separates large impurities according to their size. The sesame seeds then enter a destoner to separate impurities such as stones that are heavier than sesame seeds according to their specific gravity. Finally, the sesame seeds enter a magnetic funnel to separate magnetic sand and gravel from the sesame seeds, thus obtaining pure sesame seeds. There are two destoners installed, and the two destoners are connected in series, meaning that the sesame seeds need to pass through two destoners continuously for impurity separation.
[0055] After cleaning the impurities, the sesame seeds are placed in a drying chamber for hot air drying to remove moisture. The moisture content of the sesame seeds is controlled at 5 wt%, and the temperature of the sesame seeds in the drying chamber is controlled at 35 degrees Celsius. During the drying process, a rotating shovel is used to scoop up and shake the sesame seeds, thus scattering them into the air and letting them fall. During the falling process, the sesame seeds are evenly dried by the hot air. The rotating shovel also moves back and forth inside the drying chamber to continuously scoop up and shake the sesame seeds, and the time interval between each movement of the shovel is controlled at 0.5 minutes.
[0056] The dried sesame seeds are put into a screw press for oil extraction. The screw speed is controlled at 40 revolutions per minute, the sesame seed feed temperature is 35 degrees Celsius, and the oil output temperature is 45 degrees Celsius.
[0057] S4. Sedimentation and filtration:
[0058] After the sesame oil is extracted, it is allowed to settle, and then finely filtered to obtain edible sesame oil. The fine filtration of sesame oil must be carried out at a temperature of 20 degrees Celsius.
[0059] After the screw press extracts oil from sesame seeds, it produces sesame residue. The sesame residue is placed in a vacuum environment for natural drying. The temperature of the vacuum environment is controlled at 40 degrees Celsius, and the drying time is 2 hours. The dried sesame residue is then crushed and sieved through a 20-mesh screen. The sesame oil needs to be finely filtered at a temperature of 20 degrees Celsius.
[0060] The sieved sesame residue was subjected to supercritical CO2 extraction at a fluid extraction pressure of 35 MPa and an extraction temperature of 35 degrees Celsius to obtain crude sesame oil. The fluid flow rate was 800 L per hour and the extraction time was 40 minutes.
[0061] The crude sesame oil was treated with an ultra-microfiltration membrane. The filtered crude sesame oil then needed to be irradiated with ultraviolet light. The ultra-microfiltration membrane was selected with a molecular weight cutoff of 80kD. The irradiation dose of the ultraviolet light was 300J per square meter and the irradiation time was 10 seconds.
[0062] Example 2:
[0063] A conveyor belt is installed above the receiving hopper. The conveyor belt is used to evenly transport sesame seeds to the top of the receiving hopper. The sesame seeds fall into the receiving hopper due to gravity. At the same time as the sesame seeds fall, a fan is installed between the receiving hopper and the conveyor belt. The fan's wind power is used to blow away the sesame seeds during the falling process, so as to blow away light impurities such as dust and sesame skins contained in the sesame seeds. The height of the sesame seeds falling from the conveyor belt to the receiving hopper is controlled at 2 meters.
[0064] The receiving hopper vibrates via a vibrating motor, and a screening machine is connected to the bottom of the receiving hopper. The screening machine separates large impurities based on their size. Then, the sesame seeds enter the destoner, which separates impurities such as stones, which are heavier than sesame seeds, based on their specific gravity. Finally, the sesame seeds enter the magnetic funnel, which separates magnetic sand and gravel from the sesame seeds, thus obtaining pure sesame seeds. There are two destoners, which are connected in series, meaning that the sesame seeds need to pass through two destoners continuously for impurity separation.
[0065] After cleaning the impurities, the sesame seeds are placed in a drying chamber and dried with hot air to remove moisture. The moisture content of the sesame seeds is controlled at 7 wt%, and the temperature of the sesame seeds in the drying chamber is controlled at 40 degrees Celsius. During the drying process, a rotating shovel is used to scoop up and shake the sesame seeds, thus scattering them into the air and letting them fall. During the falling process, the sesame seeds are evenly dried by the hot air. The rotating shovel also moves back and forth inside the drying chamber to continuously scoop up and shake the sesame seeds, and the time interval between each movement of the shovel is controlled at 1 minute.
[0066] The dried sesame seeds are put into a screw press for oil extraction. The screw speed is controlled at 40 revolutions per minute, the sesame feed temperature is 25 degrees Celsius, and the oil output temperature is 50 degrees Celsius.
[0067] After the sesame oil is extracted, it is allowed to settle, and then finely filtered to obtain edible sesame oil. The fine filtration of sesame oil must be carried out at a temperature of 40 degrees Celsius.
[0068] After the screw press extracts oil from sesame seeds, it produces sesame residue. The sesame residue is placed in a vacuum environment for natural drying. The temperature of the vacuum environment is controlled at 60 degrees Celsius, and the drying time is 7 hours. The dried sesame residue is then crushed and sieved through a 40-mesh screen. The sesame oil needs to be finely filtered at a temperature of 40 degrees Celsius.
[0069] The sieved sesame residue was subjected to supercritical CO2 extraction at a fluid extraction pressure of 45 MPa and an extraction temperature of 45 degrees Celsius to obtain crude sesame oil. The fluid flow rate was 1100 L per hour and the extraction time was 100 minutes.
[0070] The crude sesame oil was treated with an ultra-microfiltration membrane. The filtered crude sesame oil then needed to be irradiated with ultraviolet light. The ultra-microfiltration membrane was selected with a molecular weight cutoff of 120kD. The irradiation dose of the ultraviolet light was 400J per square meter and the irradiation time was 20 seconds.
[0071] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.
Claims
1. A method for low-temperature cold pressing extraction of sesame oil, characterized in that: The method for low-temperature cold pressing extraction of sesame oil includes the following steps: S1. Impurity removal: A conveyor belt is installed above the receiving hopper. The conveyor belt is used to evenly transport sesame seeds to the top of the receiving hopper. The sesame seeds fall into the receiving hopper due to gravity. At the same time as the sesame seeds fall, a fan is installed between the receiving hopper and the conveyor belt. The fan's wind power is used to blow away the sesame seeds during the falling process, so as to blow away light impurities such as dust and sesame skin contained in the sesame seeds. The receiving hopper vibrates via a vibrating motor, and a screening machine is connected to the bottom of the receiving hopper. The screening machine separates large impurities based on their size. Then, the sesame seeds enter the destoner, which separates impurities such as stones, which are heavier than sesame seeds, based on their specific gravity. Finally, the sesame seeds enter the magnetic funnel, which separates magnetic sand and gravel from the sesame seeds, thus obtaining pure sesame seeds. S2. Drying treatment: After cleaning the impurities, the sesame seeds are placed in a drying room and dried with hot air to remove moisture. During the drying process, a rotating shovel is used to lift and shake the sesame seeds, which are then scattered into the air and fall. During the falling process, the sesame seeds are evenly dried by the hot air. S3, Low-temperature cold pressing: The dried sesame seeds are put into a screw press for oil extraction. The screw speed is controlled at 40 revolutions per minute. The sesame seed feed temperature is 5-35 degrees Celsius, and the oil output temperature is 45-50 degrees Celsius. S4. Sedimentation and filtration: After the sesame oil is extracted, it is allowed to settle, and then finely filtered to obtain edible sesame oil. S5. Sesame residue treatment: After the screw press extracts oil from sesame seeds, it produces sesame residue. The sesame residue is placed in a vacuum environment for natural drying. After drying, the sesame residue is crushed and sieved through a 20-40 mesh screen. S6, Supercritical Extraction: The sieved sesame residue was subjected to supercritical CO2 extraction at a fluid extraction pressure of 35-45 MPa and an extraction temperature of 35-45 degrees Celsius to obtain crude sesame oil. S7, Ultrafiltration Treatment: The crude sesame oil is treated with an ultra-microfiltration membrane, and the filtered crude sesame oil is then irradiated with ultraviolet light.
2. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S1, the height at which the sesame seeds fall from the conveyor belt into the receiving hopper is controlled at 1-2 meters.
3. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S1, there are two destoners, and the two destoners are connected in series, meaning that sesame seeds need to pass through two destoners continuously for impurity separation.
4. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S2, the moisture content of sesame seeds is controlled at 5wt%-7wt%, and the temperature of sesame seeds in the drying room is controlled at 35-40 degrees Celsius.
5. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S2, the rotatable shovel moves back and forth inside the drying chamber to continuously scoop up and shake off the sesame seeds, and the time interval between each movement of the shovel is controlled at 0.5-1 minute.
6. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S4, the fine filtration of sesame oil must be carried out at a temperature of 20-40 degrees Celsius.
7. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S5, the temperature of the vacuum environment is controlled at 40-60 degrees Celsius, and the drying time is 2-7 hours.
8. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S6, the fluid flow rate is 800-1100L per hour, and the extraction time is 40-100 minutes.
9. The method for low-temperature cold pressing and extraction of sesame oil according to claim 1, characterized in that: In step S7, the ultrafiltration membrane is selected with a molecular weight cutoff of 80-120kD, the ultraviolet lamp irradiation dose is 300-400J per square meter, and the irradiation time is 10-20 seconds.