Novel sesame oil squeezing process capable of improving oil yield
Through multi-stage transformer pressing and ultrasonic assisted extraction technology combined with solvent leaching and physical separation, the problems of low oil yield and poor oil quality in traditional sesame oil pressing are solved, and efficient and low-cost sesame oil production is achieved.
Patent Information
- Application Number
- CN202510522499.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2025-07-08
AI Technical Summary
In the traditional sesame oil pressing process, the oil yield is low and the quality of the oil is difficult to balance. High-temperature treatment leads to oxidation of nutrients, while low-temperature treatment makes it difficult to fully extrude the oil and fat in cells, and the prior art is difficult to achieve efficient production.
Multi-stage transformer pressing technology is used to combine ultrasonic assisted extraction and solvent leaching and physical separation. By accurately controlling temperature and humidity, ultrasonic waves are used to destroy sesame cell structure, and the process flow is optimized in combination with an automated control system.
It significantly improves the oil yield by 25%-35%, retains the nutrients and flavor of sesame oil, reduces production costs, is highly adaptable, and is suitable for sesame oil production of different scales.
Smart Images
Figure CN120272269A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sesame oil pressing processes, and specifically to a novel sesame oil pressing process for improving the oil yield. Background Art
[0002] In the field of edible oil production, sesame oil is highly favored for its rich aroma and abundant nutrition. The traditional sesame oil pressing processes are mainly the hot pressing method and the cold pressing method. The hot pressing method is carried out in a high-temperature environment (usually exceeding 120°C). Although it can make the oil in sesame flow out quickly and the oil yield is relatively high, the high temperature causes a large amount of oxidation and decomposition of nutrients such as unsaturated fatty acids and vitamin E in sesame. The antioxidant ability of the oil product is weakened, the shelf life is shortened, and acrylamide and other harmful substances are produced due to protein denaturation, which endangers the health of consumers. At the same time, the high temperature will also cause sesame to burn and produce a pungent and unpleasant flavor, affecting the taste of the product.
[0003] Although the cold pressing method is operated at a low temperature below 40°C and can better retain the nutrition and flavor of sesame, due to the low temperature, the viscosity of the oil in sesame cells is large and the fluidity is poor, making it difficult to fully extrude from the cell gaps. The oil yield is much lower than that of the hot pressing method, only 30%-40%. A large amount of oil remains in the cake residue, causing waste of raw materials and increasing production costs.
[0004] From the cellular level, the traditional processes have limited means of destroying the sesame cell structure and mainly rely on mechanical extrusion, unable to effectively open the cells and hinder the release of oil. And in the cake residue treatment link, the existing solvent extraction method has the risk of solvent residue, and the physical separation method has low efficiency and is difficult to fully recover the residual oil, resulting in the overall oil yield being difficult to break through. Therefore, it is urgent to develop an innovative process to balance the oil yield and the quality of the oil product and achieve efficient production.
[0005] (1) Technical Problems to be Solved
[0006] In view of the deficiencies of the prior art, the present invention provides a novel sesame oil pressing process for improving the oil yield, which solves the technical problems raised in the above background art.
[0007] (2) Technical Solutions
[0008] To achieve the above object, the present invention provides the following technical solutions: A new sesame oil pressing process for improving the oil yield, comprising the following steps: Sesame pretreatment step, screening and cleaning the sesame, and controlling the temperature and humidity; The screening is carried out by a vibrating screening device, and the cleaning temperature is controlled between 28°C and 32°C; The mesh number of the vibrating screening device is 60 meshes, and through this device, impurities with a particle size larger than 60 meshes in the sesame can be effectively removed to ensure the purity of the raw material; During the cleaning process, the spray water pressure is maintained at 0.2 MPa to ensure that the dirt on the surface of the sesame is fully washed, and the cleaning duration is 10 minutes; After cleaning, with the help of a temperature and humidity control device, the moisture content of the sesame is accurately adjusted to 10%, creating suitable conditions for the subsequent pressing process.
[0009] Preferably, the pressing step adopts a multi-stage variable pressure pressing technology, including at least three stages of pressing, and the pressures of each stage are 12 MPa, 22 MPa, and 32 MPa in sequence; During the multi-stage variable pressure pressing process, the pressing time for each stage is 15 minutes; The first-stage pressing initially extrudes part of the sesame oil at a pressure of 12 MPa. After 15 minutes, the second-stage pressing increases the pressure to 22 MPa to further promote the release of oil, which also lasts for 15 minutes. Finally, the third-stage pressing completes the final pressing stage at a pressure of 32 MPa to ensure that the oil is fully extruded.
[0010] Preferably, it further includes an ultrasonic-assisted extraction step, introducing ultrasonic waves during or after the pressing process, and the ultrasonic frequency is 25 kHz; The ultrasonic-assisted extraction time is 20 minutes. Specifically, this step is introduced after the second-stage pressing. Using an ultrasonic device with a frequency of 25 kHz, through the cavitation effect of ultrasonic waves, the sesame cell structure is destroyed, promoting the release of more oil inside the cells and significantly improving the oil extraction efficiency.
[0011] Preferably, a secondary treatment step is carried out on the pressed cake residue, adopting a method combining solvent extraction and physical separation; The solvent used for solvent extraction is n-hexane, and the extraction time is 3 hours; The pressed cake residue is placed in a sealed extraction tank, and the temperature in the tank is maintained at 40°C. Using n-hexane to fully dissolve the residual oil in the cake residue within 3 hours.
[0012] Preferably, when the physical separation adopts a centrifugal separation method, the rotation speed is 3500 revolutions per minute, and through this rotation speed, the separation of oil and cake residue can be effectively achieved to obtain the residual oil; If filtration separation is adopted, a filter screen with a pore diameter of 0.2 mm is selected, which can accurately filter out the cake residue and fully recover the residual oil.
[0013] Preferably, the vibration frequency of the vibrating screening device during operation is 50 Hz, ensuring that the screening process is efficient, stable, and the impurities are removed thoroughly.
[0014] Preferably, a multi-stage variable pressure pressing device uses a hydraulic system with the model number YZ-300 to achieve pressure control. The pressure control accuracy of this hydraulic system can reach ±0.5 MPa, ensuring the accuracy and stability of the pressing pressure at each stage.
[0015] Preferably, the power of the ultrasonic-assisted extraction device is 300 W. At this power, the ultrasonic cavitation effect is significant, and it can efficiently destroy the cell structure of sesame seeds.
[0016] Preferably, during the entire process, the Siemens S7-300 automation control system is used to monitor and regulate the operating parameters of each device in real time, ensuring the stable and efficient operation of the entire process and the uniformity of product quality.
[0017] (III) Beneficial effects
[0018] Compared with the prior art, the present invention provides a new sesame oil pressing process for improving the oil yield, having the following beneficial effects:
[0019] 1. Significantly improve the oil yield: The multi-stage variable pressure pressing technology of the present invention accurately adjusts the pressure according to the pressure characteristics of sesame seeds at different stages. Through a large number of experimental verifications, compared with the traditional process, the oil yield can be increased by 25%-35%. Taking common sesame raw materials as an example, the oil yield of the traditional process is about 40%-45%, while using this new process, the oil yield can be increased to 65%-70%. At the same time, the innovatively introduced ultrasonic-assisted extraction technology uses the cavitation effect of ultrasonic waves to effectively destroy the cell structure of sesame seeds, further releasing the oil inside the cells and greatly increasing the oil output. In the cake residue treatment link, by combining solvent extraction and physical separation methods, the residual oil is fully recovered. After testing, the residual oil content in the cake residue is reduced from 8%-10% of the traditional process to 3%-5%, further improving the overall oil yield.
[0020] 2. Ensure the quality of the oil product: In the pretreatment stage, the accurate temperature and humidity control screening and cleaning process removes impurities in sesame seeds, avoiding unnecessary damage and pollution to sesame seeds before processing and providing high-quality raw materials for subsequent processing. During the entire process, the destruction of sesame nutritional components and flavor substances caused by excessive temperature is avoided. Analyzed by a professional testing agency, the content of unsaturated fatty acids in the sesame oil produced by this process is increased by 10%-15% compared with the traditional hot pressing method, and the retention rate of antioxidant components such as vitamin E is as high as over 90%, ensuring that the produced sesame oil has a strong aroma, rich nutrition, and excellent quality.
[0021] 3. Reduce production costs: A higher oil yield means that more sesame oil can be produced per unit of raw material, reducing the waste of raw materials and lowering the raw material cost per unit of product.
[0022] 4. Strong process adaptability: The operations of each step of the new process of the present invention are relatively flexible. The process parameters can be appropriately adjusted according to sesame raw materials of different qualities and actual production requirements. Whether it is newly harvested sesame with a relatively high moisture content or sesame with a relatively low moisture content after being stored for a period of time, efficient production can be achieved by adjusting the moisture control parameters in the pretreatment stage, the pressure and time parameters in the pressing stage, and the relevant parameters of ultrasonic-assisted extraction. Moreover, this process is applicable to sesame oil production enterprises of different scales. From small workshop-style production to large industrial production lines, the process details can be flexibly optimized according to their own equipment and output requirements, with strong adaptability, which is conducive to popularization and application in sesame oil production enterprises of different scales. Brief Description of the Drawings
[0023] Figure 1 It is a schematic diagram of a new sesame oil pressing process flow for improving the oil yield proposed by the present invention.
[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0025] Embodiment 1:
[0026] A new sesame oil pressing process for improving the oil yield includes the following steps: Sesame pretreatment step, screening and cleaning the sesame, and controlling the temperature and humidity; The screening uses a vibrating screening device, and the cleaning temperature is controlled between 28°C and 32°C; The mesh number of the vibrating screening device is 60 meshes, and through this device, impurities with a particle size larger than 60 meshes in the sesame can be effectively removed to ensure the purity of the raw material; During the cleaning process, the spray water pressure is maintained at 0.2 MPa to ensure that the dirt on the surface of the sesame is thoroughly washed, and the cleaning duration is 10 minutes; After cleaning, with the help of a temperature and humidity control device, the moisture content of the sesame is accurately adjusted to 10%, creating suitable conditions for the subsequent pressing process. The pressing step uses a multi-stage variable pressure pressing technology, including at least three stages of pressing, and the pressures of each stage are 12 MPa, 22 MPa, and 32 MPa in sequence; During the multi-stage variable pressure pressing process, the pressing time for each stage is 15 minutes; The first-stage pressing initially extrudes part of the sesame oil at a pressure of 12 MPa. After 15 minutes, the second-stage pressing increases the pressure to 22 MPa to further promote the release of the oil, which also lasts for 15 minutes. Finally, the third-stage pressing completes the final pressing stage at a pressure of 32 MPa to ensure that the oil is fully extruded. It also includes an ultrasonic-assisted extraction step, introducing ultrasonic waves during or after the pressing process, with an ultrasonic frequency of 25 kHz; The ultrasonic-assisted extraction time is 20 minutes, specifically introducing this step after the second-stage pressing. Using an ultrasonic device with a frequency of 25 kHz, through the cavitation effect of ultrasonic waves, the cell structure of the sesame is destroyed, promoting the release of more oil inside the cells and significantly improving the oil extraction efficiency. The pressed cake residue is subjected to a secondary treatment step, using a method combining solvent extraction and physical separation; The solvent used for solvent extraction is n-hexane, and the extraction time is 3 hours; The pressed cake residue is placed in a sealed extraction tank, and the temperature in the tank is maintained at 40°C. Using n-hexane to fully dissolve the residual oil in the cake residue within 3 hours. When the physical separation uses a centrifugal separation method, the rotation speed is 3500 revolutions per minute, and through this rotation speed, the separation of the oil and the cake residue can be effectively achieved to obtain the residual oil; If filtration separation is used, a filter screen with a pore size of 0.2 mm is selected, which can accurately filter out the cake residue and fully recover the residual oil. The vibration frequency of the vibrating screening device during operation is 50 Hz to ensure an efficient, stable screening process and thorough impurity removal. The multi-stage variable pressure pressing device uses a hydraulic system with the model YZ-300 to achieve pressure control, and the pressure control accuracy of this hydraulic system can reach ±0.5 MPa to ensure the accurate and stable pressing pressure at all levels. The power of the ultrasonic-assisted extraction equipment is 300 W. At this power, the ultrasonic cavitation effect is significant, which can efficiently destroy the sesame cell structure. During the whole process, the Siemens S7-300 automatic control system is used to monitor and adjust the operating parameters of each device in real time to ensure the stable and efficient operation of the whole process and the uniformity of product quality. A new sesame oil pressing process for improving the oil yield has the following beneficial effects: significantly improving the oil yield: The multi-stage variable-pressure pressing technology of the present invention accurately adjusts the pressure according to the pressing characteristics of sesame at different stages. Through a large number of experimental verifications, compared with the traditional process, the oil yield can be increased by 25%-35%. Taking common sesame raw materials as an example, the oil yield of the traditional process is about 40%-45%, while using this new process, the oil yield can be increased to 65%-70%. At the same time, the innovatively introduced ultrasonic-assisted extraction technology effectively destroys the sesame cell structure by using the cavitation effect of ultrasonic waves, further releasing the oil in the cells and greatly increasing the oil output. In the cake residue treatment link, through the method of combining solvent extraction and physical separation, the residual oil is fully recovered. After detection, the residual oil content in the cake residue is reduced from 8%-10% of the traditional process to 3%-5%, further improving the overall oil yield and ensuring the oil quality: In the pretreatment stage, the screening and cleaning process with precise temperature and humidity control removes impurities in the sesame, avoiding unnecessary damage and pollution to the sesame before processing and providing high-quality raw materials for subsequent processing. During the whole process, the destruction of sesame nutritional components and flavor substances caused by too high temperature is avoided. Analyzed by a professional testing institution, the content of unsaturated fatty acids in the sesame oil produced by this process is increased by 10%-15% compared with the traditional hot pressing method, and the retention rate of antioxidant components such as vitamin E is as high as more than 90%, ensuring that the produced sesame oil has a strong aroma, is rich in nutrition and has excellent quality. Reducing production costs: A higher oil yield means that more sesame oil can be produced per unit of raw material, reducing the waste of raw materials and the raw material cost per unit product. Strong process adaptability: Each step of the new process of the present invention is relatively flexible in operation. According to different qualities of sesame raw materials and actual production requirements, the process parameters can be appropriately adjusted. Whether it is newly harvested sesame with a higher moisture content or sesame with a lower moisture content after storage for a period of time, efficient production can be achieved by adjusting the moisture control parameters in the pretreatment stage, the pressure and time parameters in the pressing stage, and the relevant parameters of ultrasonic-assisted extraction. Moreover, this process is applicable to sesame oil production enterprises of different scales. From small workshop-style production to large industrial production lines, the process details can be flexibly optimized according to their own equipment and output requirements, with strong adaptability, which is conducive to popularization and application in sesame oil production enterprises of different scales.
[0027] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A new sesame oil pressing process for improving the oil yield rate, characterized in that, It includes the following steps: Sesame pretreatment step: screening and cleaning sesame seeds, and controlling temperature and humidity; For screening, a vibrating screening device is used. The cleaning temperature is controlled between 28°C and 32°C. The mesh number of the vibrating screening device is 60 meshes. Through this device, impurities with a particle size larger than 60 meshes in sesame can be effectively removed to ensure the purity of raw materials. During the cleaning process, the spray water pressure is maintained at 0.2 MPa to ensure that the dirt on the surface of sesame is fully washed. The cleaning duration is 10 minutes. After cleaning, with the help of a temperature and humidity control device, the moisture content of sesame is accurately adjusted to 10%, creating suitable conditions for the subsequent pressing process.
2. The novel sesame oil pressing process for increasing the oil yield according to claim 1, characterized in that, The pressing step adopts a multi-stage variable pressure pressing technology, including at least three stages of pressing, and the pressures of each stage are 12 MPa, 22 MPa, and 32 MPa in sequence; during the multi-stage variable pressure pressing process, the pressing time for each stage is 15 minutes. The first stage of pressing initially extrudes part of the sesame oil under a pressure of 12 MPa for 15 minutes. After 15 minutes, the second stage of pressing increases the pressure to 22 MPa to further promote the release of oil, which also lasts for 15 minutes. Finally, the third stage of pressing completes the final pressing stage under a pressure of 32 MPa to ensure the full extrusion of oil.
3. The novel sesame oil pressing process for increasing the oil yield according to claim 1, wherein It also includes an ultrasonic-assisted extraction step. Ultrasonic waves are introduced during or after the pressing process, and the ultrasonic frequency is 25 kHz. The ultrasonic-assisted extraction time is 20 minutes. Specifically, this step is introduced after the second stage of pressing. Using an ultrasonic device with a frequency of 25 kHz, the cavitation effect of ultrasonic waves is used to destroy the sesame cell structure, promoting the release of more oil in the cells and significantly improving the oil extraction efficiency.
4. The novel sesame oil pressing process for increasing the oil yield according to claim 1, characterized in that, For the secondary treatment step of the pressed cake residue, a method combining solvent extraction and physical separation is adopted; the solvent used for solvent extraction is n-hexane, and the extraction time is 3 hours. The pressed cake residue is placed in a sealed extraction tank, and the temperature in the tank is maintained at 40°C. The n-hexane is used to fully dissolve the residual oil in the cake residue within 3 hours.
5. The novel sesame oil pressing process for improving the oil yield according to claim 4, wherein, When centrifugal separation is used for physical separation, the rotation speed is 3500 revolutions per minute. Through this rotation speed, the separation of oil and cake residue can be effectively achieved to obtain the residual oil; if filtration separation is adopted, a filter screen with a pore diameter of 0.2 mm is selected, which can accurately filter out the cake residue and fully recover the residual oil.
6. The novel sesame oil pressing process for increasing the oil yield according to claim 1, characterized in that, The vibration frequency of the vibrating screening device during operation is 50 Hz, ensuring an efficient, stable screening process and thorough removal of impurities.
7. The novel sesame oil pressing process for improving oil yield according to claim 1, characterized in that, The multi-stage variable pressure pressing device uses a hydraulic system with a model of YZ-300 to achieve pressure control. The pressure control accuracy of this hydraulic system can reach ±0.5 MPa, ensuring the accurate and stable pressure of each stage of pressing.
8. The novel sesame oil pressing process for improving the oil yield according to claim 3, characterized in that, The power of the ultrasonic-assisted extraction device is 300 W. At this power, the cavitation effect of ultrasonic waves is significant, and it can efficiently destroy the sesame cell structure.
9. The novel sesame oil pressing process for increasing the oil yield according to claim 4, characterized in that, During the entire process, the Siemens S7-300 automatic control system is used to monitor and regulate the operating parameters of each device in real time to ensure the stable and efficient operation of the entire process and the uniformity of product quality.