In the field of industrial - grade vegetable oil production, the continuous refining process is crucial for ensuring product quality. This article delves deep into how precise temperature control and a vacuum environment enhance the impurity removal effect during the continuous refining of industrial - grade vegetable oils.
The continuous refining of vegetable oils mainly consists of four core units: degumming, deacidification, decolorization, and deodorization. Each unit targets different types of impurities.
In the degumming unit, phosphatides are the main impurities. By controlling the temperature precisely, usually around 60 - 70°C, and adding appropriate degumming agents, the phosphatides can be effectively removed. Research shows that under these conditions, the removal rate of phosphatides can reach up to 95%.
During deacidification, free fatty acids are removed. A vacuum environment is used to reduce the boiling point of the fatty acids, facilitating their separation from the oil. When the vacuum degree reaches 95 - 98%, the deacidification efficiency can be significantly improved, with the acid value of the oil being reduced by 90%.
Decolorization aims to remove pigments from the oil. Adsorption materials play a key role here. Through scientific selection of adsorption materials and precise temperature control (around 90 - 110°C), the color of the oil can be effectively improved. For example, the Lovibond color value can be reduced by 80%.
In the deodorization unit, volatile odor - causing substances are removed. A combination of high - temperature (around 220 - 240°C) and high - vacuum environment is used. This process can improve the oxidation stability of the oil, with the peroxide value being reduced by 95%.
Different combinations of process parameters have significant impacts on the color, smoke point, and oxidation stability of vegetable oils. For instance, by adjusting the temperature and vacuum degree during deodorization, the smoke point of the oil can be increased from 180°C to 210°C.
| Process Parameter | Impact on Color | Impact on Smoke Point | Impact on Oxidation Stability |
|---|---|---|---|
| Temperature | Reduces color by up to 80% | Increases by up to 30°C | Improves by up to 95% |
| Vacuum Degree | Reduces color by up to 70% | Increases by up to 20°C | Improves by up to 90% |
To ensure the stable and efficient operation of the production line, regular maintenance is essential. For example, the filter cloth should be replaced every 2 - 3 months, and the equipment seal should be checked every month.
By following these maintenance procedures, the service life of the equipment can be extended, and the quality of the refined oil can be consistently maintained.
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