Salad oil refining equipment

[Model]:

2-50 tons

Motor power:

2-50KW

[Equipment Overview]:

Salad oil, commonly known as cold salad oil, is a refined food oil made by refining the crude oil pressed by an oil press. It can be eaten raw and is named after its special suitability for Western style salad and cold salad dishes. Salad oil is light yellow in color, clear, transparent, odorless, and has a good taste. When used for cooking, it does not foam and has less smoke. Can remain clear and transparent even after being refrigerated for 5.5 hours at 0 degrees Celsius (except for peanut salad oil)

Salad oil, commonly known as cold salad oil, is a refined food oil made by refining the crude oil pressed by an oil press. It can be eaten raw and is named after its special suitability for Western style "salad" cold salad dishes. Salad oil is light yellow in color, clear, transparent, odorless, and has a good taste. When used for cooking, it does not foam and has less smoke. It can remain clear and transparent even after being refrigerated for 5.5 hours at 0 degrees Celsius (except for peanut salad oil). In addition to being used as cooking and frying oil, it is mainly used as a cold dish dressing oil and can also be used as a raw material for artificial butter, shortening, mayonnaise, and various seasoning oils.

Salad oil is generally made from high-quality oilseeds that are first processed into crude oil, and then refined into finished products through oil refining equipment processes such as degumming, deacidification, decolorization, deodorization, deparaffinization, and defatting. The packaging container for salad oil should be dedicated, clean, dry, and sealed, in compliance with food hygiene and safety requirements. Do not mix with other edible oils, non edible oils, mineral oils. The shelf life is generally 6 months. At present, the salad oils available in the market include soybean salad oil, rapeseed salad oil, sunflower seed salad oil, and rice bran salad oil. Salad oil ingredient alias: Salad oil.

Salad oil refining process diagram

Beneficial ingredients such as tocopherols, sterols, sterol esters, etc. At present, traditional deacidification methods are mainly used in industrial production, including chemical deacidification, physical deacidification (or steam refining), and mixed oil deacidification. Due to their inherent limitations, these traditional deacidification methods all have some inevitable drawbacks: in order to overcome the shortcomings of traditional deacidification methods, many oil and fat scholars have sought and invented many new deacidification methods, including biological deacidification (or biological refining), chemical re esterification deacidification, solvent extraction deacidification, supercritical extraction deacidification, membrane separation technology deacidification, molecular distillation deacidification, liquid crystal deacidification, etc. Although these new methods overcome the shortcomings of traditional deacidification methods, there are still many shortcomings. This article will provide a review of the research progress on several new methods for deacidification.

Analysis of traditional deacidification methods: Traditional deacidification methods usually refer to three methods used in industrial production, including chemical deacidification, physical refining (or deacidification), and mixed oil refining (or deacidification).

Chemical deacidification, also known as alkaline refining deacidification, is the most commonly used method in industry. Typically, alkaline solution is added to the degummed oil to react with free fatty acids (FFA). FFA precipitates in the form of soap feet, and some impurities are also adsorbed by the soap feet. The soap feet are removed by centrifugal separation. Chemical deacidification usually uses caustic soda (sodium hydroxide). Neutral oil undergoes hydrolysis under alkaline action, resulting in significant loss of oil and fat; In addition, the soap feet carrying neutral oil also cause neutral oil loss. The production of soap feet requires sulfuric acid acidification treatment, which causes a large amount of wastewater and pollutes the environment. The fuel consumption depends on the FFA content of the crude oil, and the higher the FFA content, the greater the fuel consumption. This method is more thorough in deacidification and ensures stable oil quality.

Physical deacidification is a method of removing FFA, unsaponifiable substances, and odorous substances by introducing steam into oil under high vacuum conditions. Compared with chemical deacidification, this method produces no soap feet, resulting in low fuel consumption, high FFA quality, and simple operation. It requires less steam, water, and power, and requires low investment. Some heat sensitive pigments (carotenoids) and odorous substances are also removed by steam stripping. Compared with alkali refining and deacidification, physical deacidification has the advantages of high yield, no soap residue production, reduced overflow volume, and reduced environmental pollution; However, there are also drawbacks such as strict requirements for pre-treatment of cottonseed oil, unsuitability for heat sensitive cottonseed oil, and the production of polymers and trans acids from oil at high temperatures.

Dewaxing technology: Dewaxing is an important step in improving the quality of edible oil. The presence of wax mainly affects the palatability of oils and fats, so the main purpose of dewaxing is to improve the palatability of oils and fats and enhance their sensory properties such as transparency and brightness. The wax content of different oil products varies, and dewaxing is almost necessary for the following oil products (such as corn oil, rice bran oil, sunflower seed oil, cottonseed oil, etc.). Although there are many methods for dewaxing, such as freeze crystallization, surfactant method, cold polymerization agent method, electrostatic method, neutralization and winterization method, etc. However, currently in industrial production, the freezing crystallization method is basically used. At the same time, due to the different crystal properties of different oil products, their crystallization rate, temperature, nutrient time, and filtration method also vary greatly.

Decolorization technology: high-efficiency activated clay is added to the oil, and thoroughly mixed and heated under vacuum to adsorb tiny particles of pigment particles suspended in the oil onto the clay grains, which are then filtered out by a leaf sleep filter. This system has a complete layout and reliable performance, with advanced configuration of key equipment such as decolorization tower and blade filtration mechanism, ensuring high-quality decolorization and separation of oil products.

This technology has the following advantages:

1. During decolorization, clay and oil are mixed under vacuum to avoid the influence of air, resulting in higher utilization rate of clay and better decolorization effect. Under the same decolorization effect, clay consumption is reduced.

2. According to the needs of decolorization, the addition ratio of clay can be accurately and automatically measured.

3. The continuous and perfect mixing process ensures that all clay particles come into uniform contact with the oil.

4. The temporary storage tank for adhesive colored oil adopts negative pressure design, effectively avoiding contact between oil and air, making the quality of intermediate and final products more stable.

5. The filtration of decolorized oil is carried out in a sealed stainless steel filter, with low residual oil in the filter cake, easy operation, and low equipment failure rate.

6. The filter adopts an automatic control system, which simplifies the operation and ensures more stable production.