The oils and fats obtained from the seeds or fruits of plants through pressing or extraction are collectively referred to as crude oil. They must be refined before they can be eaten. Different vegetable oils have different refining methods and different refining production lines. Generally need to go through a few steps
By distillation, the solvent introduced during the extraction is evaporated by heating.
To degumming, let the hot water (80°C) rinse the grease, stir well and let stand to precipitate the gums and proteins.
Neutralization, or deoxygenation, treats the oil with sodium hydroxide or sodium carbonate to remove free fatty acids, phospholipids, pigments and waxes.
Bleaching to remove unsightly colors, use diatomaceous earth, activated carbon, and activated earth to remove unsightly colors.
Dewaxing, or antifreeze, improves the transparency of oil, lowers the temperature, and removes precipitated solids.
Deodorization, by evaporating unstable compounds that may cause abnormal odors and tastes, by high temperature and high pressure steam.
Anti-corrosion, add preservatives to help the oil remain stable.
In addition, filtration, a non-chemical process that screens out large particles of impurities, can also be considered a refining step, although it does not change the state of the oil
Dayang Company can manufacture various vegetable oil refining production lines according to customer requirements
Vegetable oil refining production line, Dayang Company can manufacture various oil refining production lines.
The production line can be divided into batch type, semi-continuous type, and full-continuous type. The batch type mainly includes alkali refining pot, decolorizing pot, deodorizing pot, filter, vacuum pump and heat-conducting oil furnace, etc.
The processing method of the vegetable oil refining production line is to remove harmful impurities from the crude oil to ensure that the color, transparency, taste, stability, fatty acid composition and nutritional components of the edible oil meet certain quality standards, which is essential in the vegetable oil production line of.
Crude oil → degumming → deacidification → decolorization → filtration → deodorization → filtration → fractionation/winterization/dewaxing (optional) → refined oil
Alkali refining pot in the vegetable oil refining production line: remove impurities such as phospholipids and free fatty acids. Alkali refining pot, also called refining pot, is used for hydration degumming, neutralization and deacidification of oil. Alkali pan degumming firstly preheats the oil to 60-70°C, adds concentrated phosphoric acid of 0.05%-0.2% of the oil mass, mixes fully in the mixer, and stays in the temporary storage tank for a while, then adds 1%-5 % water for hydration, and then centrifuged, the oil is dehydrated and then decolorized with activated clay. Alkali deacidification is to add caustic soda to the alkali kettle to neutralize the free fatty acid to produce soap, and then separate the soap from the oil.
Decolorization pan in vegetable oil refining line: removal of pigment. The decolorizing pot first needs to add a decolorizing agent accounting for 1-3% of the oil weight (mainly clay), for physical adsorption, and then filter equipment to separate the oil from the decolorizing agent, so as to achieve the purpose of decolorizing.
Deodorization pot in vegetable oil refining production line: removes odor from oil. Under a high temperature of 220-260°C and a certain vacuum condition, a certain amount of superheated steam needs to be introduced into the deodorization pot to strip the oil, and the purpose of deodorization is achieved according to the difference in the volatilization point of the oil and volatile small molecular substances. Because the temperature during deodorization will reach about 260 degrees, the carbon steel material of the deodorization pot may produce harmful substances at high temperature, so the deodorization pot of Dayang Company is made of stainless steel to ensure the quality of the refined oil.
The deodorized oil in the dewaxing system of the vegetable oil refining production line exchanges heat with the refrigerant through the plate heat exchanger. After the oil temperature drops to 22-25 ° C, it is pumped into the stainless steel crystallization tank. Under the action of stirring, the circulation of the refrigerant in the coil makes it slow Cool down to 18°C to form crystals. The crystallization time is about 3-6h. Press the crystalline oil into the crystal growth tank, grow the crystal at a constant temperature of 18°C for 3-6 hours and filter to obtain the dewaxed oil.
Filters in vegetable oil refining production lines: remove impurities and decolorizing agents in oils and fats.
Vacuum pump for vegetable oil refining production line: to generate negative pressure vacuum environment for decolorization pot and deodorization pot.
Heat conduction oil furnace for vegetable oil refining production line: providing heat source
In order to meet the needs of customers with different processing volumes, Dayang Company can provide you with 1-20 tons/day intermittent vegetable oil refining production line, 10-50 tons/day semi-continuous edible oil semi-continuous vegetable oil refining production line and more than 50 tons/day full-scale There are three types of continuous vegetable oil refining production lines. Of course, these three types of vegetable oil refining production lines have their own advantages, and you can choose one according to your specific needs.
Intermittent vegetable oil refining production line: simple and flexible operation, low investment, suitable for frequent replacement of various oils, suitable for manufacturers with small processing volume.
Semi-continuous vegetable oil refining production line: the degumming and decolorization section is intermittent production, or decolorization can be continuous. The deacidification and deodorization section adopts deodorization tower process for continuous production, which can realize continuous refining, high efficiency, energy saving, economy, and high additional output value. .
Fully continuous vegetable oil refining production line: It can realize continuous and uninterrupted production of all sections, with small production consumption, low oil loss, and more stable refined oil quality. For the deacidification and deodorization section of continuous refining, choose a single tower, or choose a double tower coupled production process
According to the type of crude oil and the size of the processing volume, the engineers of Ocean Oil can customize a set of edible oil refining machine for you. For more than ten years, Dayang Oils has been adhering to the business philosophy of "quality first, integrity first". The edible oil equipment has reliable quality and has been exported to more than 90 countries and regions abroad. It is committed to redefining "intelligent manufacturing in China" with first-class technical products Connotation.
