The mini oil refining and dewaxing equipment has all the functions of large oil refining and dewaxing equipment and is superior to large and medium-sized refining equipment sets. It is suitable for refining various oils into national standard first-grade oil, and cooking oil. The set owns a heat source and electrical control device, with the advantages of low energy consumption and small space occupation. It does not require a boiler or a dedicated factory building and is suitable to work with small oil pressing mill for refining.Main Supporting Equipment:- Neutralization Pot (for acid refining, alkali refining, and water washing);- De-coloring Pot (for bleaching oils and removing pigments, dehydration);- De-odorizing Pot (for removing the odor and peroxide value of oils, and harmful microorganisms);- Vacuum Pump (provides vacuum for de-coloring and de-odorizing);- Small portable electric heating steam generator (for de-odorizing and filtering machine);- Leaf Filter (for filtering activated clay).

Walnut Oil Refining Equipment - Physical Refining EquipmentPhysical refining is a process in which crude oil undergoes de-gumming, de-acidification, de-coloring, and de-odorization to remove non-glyceride components.Among these, de-acidification is one of the key processes in oil refining, aimed at removing free fatty acids from the crude oil while also removing some impurities such as pigments, phospholipids, hydrocarbons, and mucilage, as well as beneficial components like tocopherols, sterols, and sterol esters. The methods currently used in industrial production for de-acidification mainly include traditional methods such as chemical de-acidification, physical de-acidification (or steam refining), and mixed oil de-acidification. Many oil scientists have developed new de-acidification methods, including biological de-acidification (or biorefinery), chemical re-esterification de-acidification, solvent extraction de-acidification, supercritical extraction de-acidification, membrane separation technology de-acidification, molecular distillation de-acidification, and liquid crystal de-acidification. Although these new methods overcome the shortcomings of traditional de-acidification methods, they also have their limitations.Traditional de-acidification methods typically refer to those used in industrial production, including chemical de-acidification, physical refining (or de-acidification), and mixed oil refining (or de-acidification).Chemical de-acidification, also known as alkali refining, is widely used in industry. Typically, alkali solution is added to the degummed oil, causing the alkali to react with free fatty acids, precipitating them as soap stock. Some impurities are also adsorbed by the soap stock, which is then separated by centrifugation. Chemical de-acidification usually uses caustic soda (sodium hydroxide). Neutral oils undergo hydrolysis under the action of alkali, resulting in significant oil loss; in addition, neutral oils entrained in the soap stock also lead to neutral oil loss. The soap stock needs to be treated with sulfuric acid, leading to a large amount of wastewater and environmental pollution. The amount of oil loss depends on the acid value of the crude oil; the higher the acid value, the greater the oil loss. This method is relatively thorough in de-acidification and stabilizes the oil quality.Physical de-acidification, also known as steam refining, is performed under high vacuum conditions. Steam is introduced into the oil to carry away acid value, non-saponifiable matter, and odor-causing substances. Compared with chemical de-acidification, this method does not produce soap stock, resulting in lower oil loss and higher oil quality. It also has the advantages of simple operation, requiring less steam, water, and power, and lower investment. Some heat-sensitive pigments (carotenoids) and odor-causing substances are also removed with the steam stripping. Compared with alkali refining, physical de-acidification has the advantages of high production capacity, no soap stock production, reduced overflow, and reduced environmental pollution. However, it also has the disadvantages of strict pre-treatment requirements for crude oil, unsuitability for heat-sensitive cottonseed oil, and the formation of polymers and trans fatty acids under high temperatures.In recent years, the development of the oil industry in China has been rapid, with many advanced foreign oil physical refining equipment and production lines being introduced into the country. At the same time, many old oil mills have been expanding and upgrading. Therefore, it is urgent to upgrade the refining production lines of a large number of oil companies in China to adapt to the new market situation.According to the national conditions, the specific conditions of small and medium-sized enterprises, and the trend of promoting physical refining in oil production, Xinxiang Hongyang Machinery Co. Ltd. has developed a new process suitable for the transformation and upgrading of small and medium-sized oil enterprises in China. The main problems in the domestic oil refining industry are mainly manifested in the instability of product quality, poor economic and technical indicators, inadequate de-coloring and de-odorization, the widespread presence of "four color" challenges, unreasonable treatment of by-products, high consumption, low yield, and especially the poor solution of "three wastes" pollution, which cannot meet the requirements of clean production and environmental protection. These problems are particularly severe in small and medium-sized oil enterprises in China and require an industry-wide transformation and upgrading. Although the advanced refining lines imported from abroad have advanced technology, they are too costly to be quickly and widely adopted by small and medium-sized oil enterprises in China. In response to the challenges and shortcomings in the physical refining technology of medium-sized oil processing enterprises in China, Hongyang Company has developed a new physical refining technology suitable for the main edible vegetable oils produced in China (rape seed oil, soybean oil, sunflower seed oil, cottonseed oil, and rice bran oil, etc.), aiming to produce high-grade oil products and solving the serious pollution problems in oil refining. The technical and economic indicators of this new technology have reached the advanced level both domestically and internationally, and the complete set of physical refining equipment production line has been designed, manufactured, installed, and put into production, with the technology being certified and operational.

As the production of sunflower seeds in China develops, it will improve the supply of edible oil for people. Currently, the quality of sunflower seeds oil produced in our province is generally considered to have the shortage of strong smoke, rapid evaporation, high content of natural sediments and lack of clarity. Compared to soybean oil, its price is high, so it is unpopular in market. To improve the market acceptance of sunflower oil, in addition to promoting its nutritional valve, it is crucial to enhance the quality management of the product. Experience shows that the main factor affecting oil quality is the refining process, thus, this refining equipment can solve this problem.Operational Process of Edible Oil Refining Equipment:Crude oil is pumped into the refining pot for de-gumming and neutralization. When the oil and soap are clearly separated and rapidly sink, stop stirring, allow to settle, and then pump the upper clear oil to the water washing pot. The soap foot is drained from the bottom to the soap foot container, and when it contains more oil, stop draining and pump the soap foot into the soap foot container. The remaining oil in the refining pot is mixed into the next pot for continued processing.The clear oil transferred from the refining pot is washed and then sent to the de-coloring pot for adsorption de-coloring. The de-colored oil is pumped to the plate filter for filtration and then to the polishing filter for further filtration. After cooling in the cooler, it enters the de-colored clear oil tank. The de-colored clear oil is sucked from the tank into the de-odorizing pot for de-odorizing under a residual pressure of 3-5 torr. The de-odorized oil is placed in the heat exchanger tank, and after being emptied, the next batch of de-colored clear oil is sucked through the heat exchanger into the de-odorizing pot, entering the next round of de-odorizing. The de-odorized oil in the heat exchanger tank is cooled with cold water, pumped out for polishing filtration, and then enters the finished oil tank.Process Flow:Crude Oil → Alkali Refining → Water Washing → De-coloring → De-odorizing → Finished ProductMain Equipment Description:Neutralization Pot: For acid refining, alkali refining, and water washing;De-coloring Pot: For bleaching oils and removing pigments;De-odorizing Pot: For removing the odor from oils;Heat Transfer Oil Furnace: Provides the required heat energy for production;Vacuum Pump: Provides the vacuum required for de-coloring and de-odorizing;Air Compressor: Dries the de-coloring clay;Press Filter: Filters the clay;Steam Generator: Produces steam for de-odorizing distillation.Main Features: Simple operation, low investment, suitable for processing various oils such as soybean, rapeseed, cottonseed, peanut, tea seed, and walnut oil with a daily capacity of 30 tons or less.

Main Features: High production automation, good quality of finished oil, suitable for processing large volumes of oils such as soybean oil, rapeseed oil, cottonseed oil, sunflower oil, lard, and beef tallow with a daily capacity of more than 100 tons.Process Flow:Main Equipment: Centrifuge, De-coloring Tower, De-odorizing Tower, Leaf Filter, Four-stage Steam Jet Pump, Water Jet PumpCrude oil first passes through a crude oil filter to remove impurities, then is preheated and sent to a mixer to be mixed with phosphoric acid. It then enters a mixed tank for acid refining, followed by a mixer where it is combined with alkali solution. After a retention period in the alkali refining retention tank, the soap stock is separated using a centrifuge. The oil is heated in a plate heat exchanger and pumped into a centrifugal mixer where it is mixed with alkali solution. It then enters a re-refining mix tank and is saponified before being separated into soap stock in a disc centrifuge. The oil is washed in a water washing centrifugal mixer with hot water, and then separated into residual soap and water in a dewatering disc centrifuge. The alkali-refined oil is dried in a vacuum dryer and then heated in a plate heat exchanger before entering the Hongyang brand continuous de-coloring tower where it is mixed with activated clay for de-coloring. The de-colored oil is pumped into a leaf filter for filtration and then into a safety filter. The de-colored oil is pumped into an air-removing vessel to remove air, then into a heat exchanger for heat exchange with de-odorizing oil. After heating in a heat transfer oil heater, it enters the de-odorizing tower. The de-odorizing oil is pumped from the bottom and heat exchanged with the de-odorizing oil in a heat exchanger, and then cooled to obtain the finished oil. Oils such as soybean oil, corn oil, peanut oil, and rice bran oil contain a small amount of fat (wax), which requires de-fatting (de-waxing).

To meet the refining needs of various large and small oil mills both domestically and internationally, Xinxiang Hongyang Company has developed refining equipment with a daily processing capacity ranging from 300 kg to 100 tons of oil. These equipment can produce international first and second-grade oils, refined oils (salad oil), and blended oils. The process equipment is available in batch, semi-continuous, and continuous types to meet user requirements. Generally, batch equipment is suitable for processing crude oil from 300 kg to 20 tons per day, while semi-continuous or continuous equipment is more suitable for larger capacities of 20 tons and above.The refining equipment developed and manufactured by our company features novel process equipment, reliable performance, high mechanization, and advanced process technical indicators. There are series of products, and the equipment can be reasonably combined according to the user's requirements for refining equipment. The newly developed and successfully developed small refining complete set equipment (processing capacity 300-3000 kg/day) combines various individual equipment. The equipment itself is equipped with a heat source and does not require the purchase of an additional steam boiler, which has the advantages of low investment, quick results, and small floor space. This equipment can be used for multiple purposes, producing international first and second-grade oils as well as cooking oil and salad oil. It is an ideal equipment for urban and rural oil processing plants.

The new product, Silybum marianum seed oil, is made from the seeds of the Silybum marianum plant, a member of the Asteraceae family. The oil is produced through a process of cold pressing and filtration. On April 16, 2014, the National Health and Family Planning Commission approved Silybum marianum seed oil as a new food ingredient, with the stipulation that it is not to be used in infant food.1. Extraction Workshop Production ProcessDue to the small production scale, and to ensure the full retention of silymarin in the cake, the oil extraction process is designed to minimize the process flow and reduce heat damage while maintaining high oil yield and product quality. This is achieved through a two-stage cold pressing method. The process flow is as follows:Silybum marianum seeds are first screened and magnetically separated to remove sand, coal slag, mud, dust, husks, and magnetic impurities. They are then softened at a temperature of around 60°C. Temperatures above this can damage the silymarin, while temperatures below this do not achieve the softening effect. Softened materials are then sent to the first press for extraction, followed by a second press. The crude oil obtained from both pressings is settled and filtered before being sent to the refining workshop. The pressed cake is broken and sent to the silymarin extraction workshop for the extraction of silymarin.2. Refining Workshop Production ProcessThe crude oil can be refined to produce either a first-grade oil or a cooking oil. The process for producing cooking oil is as follows:Aqueous alkali solution of the required concentration is prepared based on the acid value of the crude oil. The oil is stirred and heated to about 45°C in the alkali refining pot, and then the prepared alkali solution is added. The mixture is stirred and kept at this temperature for 20 to 60 minutes until the oil and soap particles are separated. The temperature is then raised to 60°C to 70°C at a rate of 1°C to 1.5°C per minute, and the mixture is stirred for another 10 minutes. When the oil and soap begin to separate, stirring is stopped, and the mixture is allowed to settle for 6 to 8 hours. The bottom layer is drained, and the oil is transferred to the water washing pot for washing. Water is added at a rate of 10% to 15% of the oil weight, at a temperature of 85°C to 90°C, and washed 2 to 3 times. The oil is then de-colored. The de-coloring temperature is 90°C to 105°C, with the addition of activated clay at 2% to 5% of the oil weight, for about 30 minutes, with a vacuum of about 96 kPa. The de-colored oil is filtered through a plate filter to remove the clay, then sent to the deodorizing pot for deodorization. The heating source is thermal oil. Steam is injected when the temperature reaches about 150°C, with the amount of steam injection carefully controlled to avoid splashing. The deodorization temperature is 210°C to 240°C, for 2.5 to 4 hours, with a residual pressure of 0.53 kPa in the pot.After deodorization, the oil is cooled in a cooler, filtered, and then pumped into the finished oil tank. The Hongyang refining process can be adjusted according to specific requirements to produce either first-grade oil or cooking oil.3. Conclusion3.1 This process has a short production line, simple equipment matching, easy operation, and low investment.3.2 The pressed cake retains a certain amount of silymarin from the raw material, providing favorable conditions for the extraction of silymarin.3.3 The oil contained in the cake is separated in the extraction workshop, minimizing oil loss.3.4 After oil extraction and silymarin extraction, the residue from the Silybum marianum seeds contains 36.4% starch and 23% protein, which can be used as animal feed.3.5 Silybum marianum oil is a healthy edible oil worth promoting.

Wheat germ oil is a type of grain germ oil produced from wheat sprouts. It contains the nutritional essence of wheat and is rich in vitamins E, linoleic acid, linolenic acid, octacosanol, and various physiological active components, making it a valuable functional food with high nutritional value. Particularly, it has the highest vitamin E content among vegetable oils and is recognized for its nutritional and health benefits. It helps regulate endocrine function, aid in weight loss, prevent freckles, dark spots, and pigmentation; has antioxidant properties, reduces the formation of peroxidized lipids, promotes skin hydration, and delays aging; promotes metabolism and skin renewal, anti-wrinkle, prevents skin aging, and eliminates scars; and helps regulate blood lipids, soften blood vessels, and prevent arteriosclerosis, hypertension, and stroke.I. Pressing MethodThe oil content in wheat germ is 7-9%, and pressing can extract 4-5% of wheat germ crude oil. The actual yield of refined wheat germ oil is even lower. Firstly, the processing cost is extremely high, lacking competitive advantage. Secondly, this method involves a waste of resources.II. Extraction Method1. Supercritical CO2 ExtractionThis extraction method is low-temperature processing, which can extract high-quality wheat germ oil with no solvent residue. However, the initial investment in equipment is large because the extraction is performed under high pressure, with a small extraction pot volume (typically 1000 liters), limited production capacity, and high costs.2. Atmospheric Solvent (N-hexane or other liquid solvents) ExtractionThis extraction method involves high temperatures during processing, which can damage the nutritional components of the extracted wheat germ oil, resulting in high solvent residue.3. N-butane Low-temperature ExtractionThis method involves low-temperature processing throughout the production process, preserving the nutritional components of the wheat germ oil, with high yield and good oil quality. The quality can match that of CO2 supercritical extraction.It can form large-scale production, with a low initial investment in fixed assets, low production costs, and environmentally friendly energy-saving features.

This equipment set is designed for intermittent refining and includes all the functions of larger and medium-sized refining equipment.The set is complete with its own heat source, electrical control, and is lightweight with low energy consumption. Customers only need to connect to electricity and tap water (a 2-meter high water tank is also acceptable), prepare a small amount of coal or wood, caustic soda, phosphoric acid, and clay, and the equipment can be used indoors or outdoors without a dedicated factory or foundation.Hongyang's small refining equipment is suitable for refining various animal and vegetable oils. After alkali refining, de-gumming, de-acidification, de-coloring, and de-odorizing, the oil quality can reach the national first and second-grade standards. The equipment requires a small investment but with a quick profit return. and is compact in structure with an aesthetically pleasing layout.The operation process for refining edible oils is as follows:The crude oil is pumped into the refining pot for de-gumming and neutralization. When the oil and soap are clearly separated and rapidly sink, stop stirring, allow to settle, and then pump the upper clear oil to the water washing pot. The soap foot is drained from the bottom to the soap foot container, and when it contains more oil, stop draining and pump the soap foot into the soap foot container. The remaining oil in the refining pot is mixed into the next pot for continued processing.The clear oil from the refining pot is washed and then goes to the de-coloring pot for adsorption de-coloring. The de-colored oil is pumped to the plate filter for filtration and then to the polishing filter for further filtration. After cooling in the cooler, it enters the de-colored clear oil tank. The de-colored clear oil is sucked from the tank into the de-odorizing pot for de-odorizing under a residual pressure of 3-5 torr. The de-odorized oil is placed in the heat exchanger tank, and after being emptied, the next batch of de-colored clear oil is sucked through the heat exchanger into the Hongyang de-odorizing pot for the next round of de-odorizing. The de-odorized oil from the heat exchanger tank is cooled with cold water, pumped for polishing filtration, and then enters the finished oil tank.Process Flow:Crude Oil → Alkali Refining → Water Washing → De-coloring → De-odorizing → Finished ProductMain Equipment Description:Neutralization Pot: For acid refining, alkali refining, and water washing;De-coloring Pot: For bleaching oils and removing pigments;De-odorizing Pot: For removing the odor from oils;Heat Transfer Oil Furnace: Provides the required heat energy for production;Vacuum Pump: Provides the vacuum required for de-coloring and de-odorizing;Air Compressor: Dries the de-coloring clay;Press Filter: Filters the clay;Steam Generator: Generates steam for de-odorizing distillation.Main Features: Simple operation, low investment, suitable for refining various oils such as soybean, rapeseed, cottonseed, peanut, tea seed, and walnut oil with a daily capacity of 30 tons or less.

Hongyang De-waxing ProcessThere are various methods for oil de-waxing, including conventional methods, volumetric methods, and surfactant methods.Conventional MethodThe conventional de-waxing method relies solely on freezing crystallization and then separates oil and wax mechanically without any auxiliary agents or methods. Separation is achieved using equipment such as pressurized filtration, vacuum filtration, and centrifugal separation. A simpler method is the single crystallization and filtration method. For example, deodorized rice bran oil (temperature above 50°C) is transferred into a storage tank equipped with cooling devices and stirred slowly. The oil is fully cooled to 25°C under atmospheric pressure. The entire cooling crystallization time is 48 hours, followed by filtration to separate oil and wax. The filtration pressure is maintained at 0.3 – 0.35 MPa, and the wax should be promptly blown out with compressed air after filtration to remove any oil entrained in the wax.Due to the low de-waxing temperature and high viscosity, separation is more challenging, so for rice bran oil with a high wax content, a two-step crystallization and filtration method is usually employed. The deodorized oil is fully cooled to 30°C in a cooling tank, and the crystallization time is 24 hours. Once filtered, the oil enters a second cooling tank, where it is continuously cooled with low-temperature water to bring the temperature down to below 25°C. After another 24 hours, a second filtration is performed, and the filtered oil is the de-waxed oil. After two filtrations, the wax content in the oil (expressed as insoluble in acetone) is below 0.03%. Some companies also use bag filtration, which can achieve good de-waxing results, but the filtration rate is slower, and the labor intensity is higher.The process flow.De-acidified rice bran oil → Cooling Crystallization → Bag Filtration → De-waxed Oil↓Wax Paste → Melting → Pressing → Crude Wax↓soft fat

Xinxiang Hongyang Machinery Co. Ltd specializes in beef fat refining equipment, beef tallow refining equipment, and various animal oil refining and processing equipment. The company has developed a complete set of animal oil refining equipment production lines with strong technical capabilities, designed according to user production processes, and offers a complete after-sales service system.In recent years, the processing demands for animal oil, feed oil, and meat meal in China have increased. Correspondingly, the requirements for hygiene and environmental protection have become increasingly stringent. The traditional open-top self-tipping melting pot is no longer suitable for modern production due to the rise in consumer standards. In response to the development prospects of the domestic animal oil industry, Hongyang has successfully developed a vacuum melting technology for refining animal oil. The company has transformed the traditional open melting equipment into an automated production line, using heat transfer oil as the heat medium and applying the vacuum production process from the chemical industry. This has significantly increased production efficiency, reduced labor costs, and improved the refining rate, acid value, color, energy efficiency, and environmental protection. The entire production process is enclosed, addressing the previous issues of poor workshop hygiene and meeting current national environmental policies.The beef fat refining equipment production line includes stages such as meat mincing, conveying, material separation, cooking, oil residue separation, filtering, crude oil rendering, and refining. The refining stage requires additional processes such as dephosphatation, degumming, dehydration, deodorization, deacidification, and decolorization before the oil can be consumed. This refined oil usually has a light color and is white after refining with Hongyang's equipment.Due to our focus and early development of beef fat refining equipment and animal oil equipment, we have a leading position in the domestic animal oil equipment market. Our equipment is popular in Sichuan, Chongqing, Inner Mongolia, Liaoning, Yunnan, Xinjiang, Hebei, and other cities. Classic customer cases include Duofu, Xiao Laowu, Hongshan River, and many more. We have multiple national patents for animal oil vacuum sealed melting equipment. Our sales and extensive practical experience have led to continuous improvements in our equipment. we solemnly promise that any individual or company using our patent products without authorization will bear law responsibility.

The production of rapeseed oil using the extraction method is as follows:Rapeseed Oil Extraction MethodRapeseed oil extraction is based on the principle of extraction, where an organic solvent capable of dissolving oil is selected and brought into contact with the oilseed after pretreatment—either through immersion or spraying. This allows the oil to be dissolved from the oilseed. The method forms a solution of solvent and the dissolved oil, known as mixed oil. By utilizing the difference in boiling points between the selected solvent and the oil, the mixed oil is evaporated and stripped to evaporate the solvent, leaving behind the oil, resulting in crude oil. The evaporated solvent steam is then condensed and recovered for reuse.Advantages of Extraction MethodThe extraction method for oil production is recognized worldwide and can be summarized with the following advantages:1. Low residual oil in mealIn the pressing method, due to the incomplete destruction of oil cells in the pretreatment process and the incomplete denaturation of proteins, the temperature and pressure in the press chamber cannot be very high. As a result, the pressing method cannot extract all the oil from the oilseed, and the residual oil rate in the press cake is relatively high. For example, the residual oil rate in the press cake obtained from various oilseeds pressed by the ZX·18 type press is generally between 5% and 8%. In contrast, the extraction method, whether direct extraction or pre-pressing extraction, can control the residual oil rate in the meal after extraction below 1%.2. High meal qualityCompared to the pressing method, in the production of rapeseed oil using the extraction method, the operation temperature of related processes is generally lower, resulting in less denaturation of proteins in the solid material. Consequently, the quality of the meal is better, which is advantageous for the feeding value of the meal or for extracting plant proteins from the meal.3. Low production costCompared to the pressing method, the extraction method typically uses a more complete production line with a higher degree of mechanization and is easier to achieve production automation. Secondly, the operation personnel in the extraction workshop are fewer, with lower labor intensity. Additionally, the energy consumption in the extraction method is relatively lower. Therefore, the production cost of the extraction method is lower.

Soybean oil is typically obtained through various methods such as pressing and extraction, resulting in crude oil with many impurities. This crude oil is then refined to produce edible refined oil.Pressing methods can be divided into ordinary pressing and screw pressing. Ordinary pressing is a method of applying pressure to soybeans. This method is now rarely used, especially in large-scale industrial production. Screw pressing involves the installation of a screw shaft in a horizontal cylinder, where pre-processed soybeans enter the screw press. As the soybeans move forward, they are squeezed to extract the oil. This method allows for continuous production but proteins undergo significant changes due to friction and heat generation during the pressing process.Oil extraction by the extraction method utilizes solvents that can dissolve oil. Through wetting, penetration, molecular diffusion, and convection diffusion, the oil is extracted from the meal. The mixed oil, consisting of solvent and oil, is then separated, and the solvent is recovered to obtain crude oil. The commonly used solvents in China's oil industry include hexane and light gasoline. Light gasoline is the most widely used solvent, but it has the drawback of being flammable and explosive, with a complex composition and a wide boiling range. The extraction method yields an oil extraction rate of up to 99%.Differences between Pressing Oil and Extraction Oil1. Different Processing TechniquesPressing oil is produced using the "physical pressing method," while extraction oil is produced using the "chemical extraction method." the physical pressing method requires high quality raw material and then go through selecting seeds, remove impurities, crushing, steaming and then pressing to get oil separated from the oil seeds. In the whole process, it adopts cooking oil seeds, then pressing by oil press and finally filtrate by high-tech natural purification method. This method can help to retain soybean’s original flavor and the oil have rich aroma and rich vitamin E, can be stored longer and contains no additives, solvent residues or soap content. It is a pure natural green food produced by combining modern and traditional techniques.Extraction oil is produced using the organic solvent extraction method, which involves the complete mixing of oilseeds with organic solvents such as "No. 6 light gasoline" (commonly referred to as "No. 6 solvent oil") and then extracted. Therefore, it is difficult to completely remove toxic organic compounds like ethane, and it can only be safely consumed by meeting extremely strict refining standard. Otherwise, it can easily harm the human body. However, during high-temperature refining, some of the nutrient vitamins are inevitably lost. In China, except for a portion of soybean oil produced by pressing, most sunflower oil, soybean oil, cottonseed oil, and other oils are mainly produced using the "No. 6 light gasoline" extraction method.2. Different Nutritional ComponentsPressing soybean oil has a full range of color, aroma, and taste, retaining various nutritional components. Extraction oil is colorless and odorless, and most of its nutritional components are destroyed during processing. The new standard for edible oils drafted by the National Grain Bureau has been implemented, canceling the old standards from 1986 and 1988. The new standard stipulates that pressing soybean oil and extraction soybean oil must be labeled with "pressing" and "extraction" respectively on the product label. With the progress of society and the improvement of people's living standards, the pursuit of nutrition and health in diet has become a goal. Making the soybean oil production process transparent is to inform consumers about the production process of soybean oil, giving consumers the right to know and choose.3. Different Requirements for Raw Materials"Pressing soybean oil" uses the pure physical pressing method, retaining the original flavor of soybeans. Therefore, the requirements for soybean raw materials are very strict, requiring freshness, low acid value, and peroxide value. As a result, the price is relatively high. Additionally, since only pressing is performed, the residual oil in soybean meal is high, and the oil yield from pressing is relatively low. Consequently, the price of pressing soybean oil is relatively high.