On September 14, 2023, Xinjiang Aksu Shengding Oil Co., Ltd. ordered Huatai Group's 3T refining and dewaxing project to start shipping.

Wax exists in the seed coat and germ of some oils in edible oils. For example, rice bran oil, camellia seed oil, peanut oil, peony seed oil, etc. contain some wax in the raw materials, which will be dissolved in the oil during pressing or leaching. In oil, wax is a polymer ester that combines monovalent fatty acids and monovalent alcohols. It has a high melting point, poor solubility, and is not easily absorbed. When the oil temperature decreases, it will crystallize and make the oil turbid, affecting the appearance of the product. Therefore, during production, the oil that has been refined and deodorized by the refining equipment needs to go through the dewaxing equipment to separate and remove the wax in the edible oil.

The edible oil dewaxing process is based on the melting point difference between wax and oil and the characteristic that the solubility of wax in oil becomes smaller as the temperature decreases. Crystal wax is precipitated through cooling, and then the wax and oil are separated through the filtration separation surface.

The oil refining process plays a very important role in the entire oil extraction process. The function of the refining equipment is to separate and remove these impurities from the oil. However, the purpose of refining is not to remove all trace substances, but to remove impurities that affect the quality, storage and eating safety of edible oil and the human body, such as free fatty acids, phospholipids, proteins, organic pigments and residual solvents. Beneficial substances such as tocopherol should be retained. Therefore, the purpose of refining is to remove harmful impurities from oil and ensure that the color, transparency, taste, stability, fatty acid composition and nutritional content of the oil meet certain quality standards.

In the production process of refining oil equipment, the purpose of each process is different. The following is the refining purpose of each process of refining oil equipment compiled by Huatai Machinery.

1. Refining and degumming process: The main purpose of the refining and degumming process is to remove phospholipids from rapeseed oil, so degumming is also called dephosphorization. Phospholipid itself is a good nutrient, but due to the poor thermal stability of phospholipids, its presence in rapeseed oil will affect the quality and use value of rapeseed oil. The phosphorus content in rapeseed oil will affect its color, flavor, and thermal stability, affecting the quality of cooked dishes. Therefore, one of the main purposes of the refining and degumming process is to reduce the phospholipid content in rapeseed oil.

2. Refining and deacidification process: The main purpose of deacidification is to remove free fatty acids in rapeseed oil, the content of free fatty acids in edible oils and the maturity of the oil, storage time, preservation methods and processing methods of rapeseed oil, etc. factors related. Free fatty acids are the main substrate that causes hydrolysis and rancidity of rapeseed oil. The content of free fatty acids has a great influence on the quality of rapeseed oil, so it must be removed as much as possible.

3. Refining and decolorization process: The color of the crude oil obtained by pressing or leaching is relatively dark and turbid. In addition to the impurities in the crude oil, it is also caused by the pigments contained in it. The pigments in rapeseed oil include natural pigments and processed pigments produced during subsequent processing, such as colored substances produced by the oxidation and isomerization of oils and lipids. The presence of these pigments will not only affect the appearance and performance of rapeseed oil, but also affect the stability of rapeseed oil. Therefore, it is necessary to remove color and reduce pigments.

4. Refining and deodorization process: Pure triglyceride fatty acid esters are colorless and odorless, but natural oils have their own special smell (also called odor). The smell is a product of oxidation, which is further oxidized to form peroxide compounds, which decompose into aldehydes, thus giving the oil its smell. Rapeseed oil itself has its own special smell, which not everyone likes. In addition, the oil production process will also produce certain odors, such as solvent smell, soapy smell, earthy smell, etc. Therefore, the purpose of deodorization is to remove these odors from oil.

5. Refining and dewaxing process: Dewaxing is a process in the refining process of some oil crops. The wax in vegetable oil comes from raw materials. These waxes cannot be absorbed by the human body, and at low temperatures, they will cause the edible oil to become turbid and solidified, affecting the appearance quality of the edible oil. Therefore, the main purpose of dewaxing is to The wax in the oil is crystallized at low temperature and grown, and then filtered to separate the oil and wax.

The edible oil dewaxing process is based on the melting point difference between wax and oil and the characteristic that the solubility of wax in oil becomes smaller as the temperature decreases. Crystal wax is precipitated by cooling, and then separated by filtration and separation surface to achieve the purpose of wax and oil separation.

The dewaxing process is as follows: refining oil - pre-cooling - crystallization - crystal growth - filtration - refined oil

1. Pre-cooling tank: Since the temperature of the refined oil and wax is relatively high, the pre-cooling tank is used to cool the oil temperature in advance and reduce the cooling time of the crystallization tank.

2. Crystallization tank: The cooling oil is directly poured into the crystallization tank for crystallization. During crystallization, the stirring speed is slow so that the oil temperature can be cooled evenly to achieve the ideal crystallization effect.

3. Crystal culture tank: After crystallization, crystal culture is carried out to provide conditions for the growth of wax fat crystal grains.

4. Filtration: The well-grown oil is first filtered through its own self-pressure. When the filtration speed is slow, the frequency conversion screw pump is started, and filtered when the speed is adjusted to a certain speed, thereby achieving the separation of oil and wax.

Huatai Machinery Manufacturer provides customers with equipment layout drawings, process flow diagrams, plant design drawings, and free installation to solve customers' worries. You are welcome to visit Huatai Group.