The crude oil getting from oil pressing or extraction plant certainly contain different amounts of non-oil impurities, such asmechanical impurities, free fatty acid, colloid, pigment, stink substances, moisture and wax, etc. These impurities will directly change the oil’s color, smell, taste, transparency, stability degree and nutrition, which not only affect the edible value, but also make the oil easy to deteriorate when storing.
Functions of Oil Refining Plant
- Oil refining process can remove the different kinds of impurity in the Crude Edible Oil.
- Oil refining process can improve the oil quality. Such as the taste, the smell, the colour, the acid value, etc. which affects human consumption.
- After oil refining, the cooking oil is not easy to Oxidize and quality can be promised to store for longer time.
Best Oil Refining Plant Solutions from AGICO
Referring to oil refining, the character of impurities contained in crude oil, and the purpose of refined oil must be concerned. AGICO will customize the oil refinery process and solution for each of customer depending on their specific situation and needs.
So called “refinery”, generally refers to deacidificationprocess. But in the broad sense, oil refinery process includes crude oil pretreatment, degumming, deacidifying, decoloring, deodorization, degreasing, and dewaxing process, etc. We will design the refining process depending on the quality requirements of refined oil.
For example, according to the relevant quality standard, edible oil refinery for soybean, peanut, and sesame, only needs pretreatment and degumming, and cottonseed oil refinery needs pretreatment, degumming and deacidifying, and rice bran oil refining needs pretreatment, degumming, deacidifying,decoloring, deodorization and dewaxing process to each the standard of cooking oil.
Oil Refining Plant Samples
AGICO can offers two types of oil refining plants. One is batch oil refining plant, the other is continuous oil refining plant.
- Batch Oil Refining Plant: Batch oil refining is used for low capacities from 10TPD to 30 TPD. The advantages are low investment, easy operation and maintenance, less effluent generation.
- Continuous Oil Refining Plant: Continuous oil refining plant is used for higher capacities ranging from 30 TPD to 500 TPD and for oils containing high fatty acid (FFA) like Rice Bran Oil etc. The advantages are very superior quality oil, low processing cost.
Workshop of Oil Refining Plant
Edible Oil Refining
According to different technology of edible oil refining, we classify it into Physical Refining & Chemical Refining. Physical refining means removal of gum in oil during process of degumming in special method and removing FFA in process of deodorizing by steam. Chemical refining means removing FFA in a chemical way (acid-base neutralization). Gum and soap foot produced is separated by centrifuges.
Edible Oil Refining Process
Edible oil refining process always including the following sections: degumming, neutralizing, bleaching, deodorizing and dewaxing.
In the entire edible oil refining process, a lot of refining equipments can also be used, such as neutralizing pot, degumming pot, centrifugal, bleaching tower, vacuum filter, deodorization tower, FFA catcher, crystallizing pot, press filter etc.
Flow chart of oil refining process
Edible Oil Refining Process – Degumming
Hydration Degumming: Hydration degumming mean adding into some hot water and controlling the corresponding conditions to make the hydrosol agglomerated, deposited and then separate them. The separated gum(after being dried) can be made into lecithin or added into cakes or meals in the extraction workshop. Hydration degumming process can improve oil edibility, storage and do good to downstream neutralization section.
Special Degumming: The technology is specially developed to meet the demands of physical refining for edible / vegetable oil refining. Add small quantity to acid or dilute base to the vegetable oil, strictly control the corresponding conditions to separate out the hydrated gum and un-hydrated gum. Gum level in oil should be controlled to suitable for downstream processing.
Edible Oil Refining Process – Neutralizing
Since there are many kinds of oilseeds and the oilseeds quality is different from each other, we combine the merits of many technologies and develop the versatile neutralization washing technology. The technology can be used to process oil of various kinds, quality and requirements. Add into alkali, water and acid to remove FFA, crude phospholipids and moisture. As a result, (degummed and neutralized) oil and by-products such as soap foot, crude phospholipids and water are obtained.
Edible Oil Refining Process – Bleaching
High activity clay is added into oil. Mix and heat mixture of oil and clay to make the small particle of pigment absorbed on the crystal of clay. At last filter the oil. Perfect mechanism, liable performance, well configured equipment-Bleaching Tower and Filters ensures excellent bleaching and separation effect.
Edible Oil Refining Process – Deodorizing
Combined deodorizing is the latest technology, which improves oil flexibility significantly. Detailed deodorizing process in the entire oil refining plant is: Most heat of bleached oil is recovered by Heat Exchangers. The bleached oil is heated to the process temperature by mineral oil or high pressure steam and then the oil enters into the Combined Deodorizer. The Deodorizer is a combined type: The upper is packing structure, which is used to remove odor components like FFA; the lower is a plate type used for heat bleaching and making product quality more consistent. Oil coming from the Deodorizer is cooled and stored after series of heat exchanger. Volatile like FFA is collected and stored as by-products.
Edible Oil Refining Process – Dewaxing
Dewaxing can improve oil quality, so it plays in important role to the finished edible / vegetable oil quality. At the same time, dewaxing can improve oil transparency and brightness. It is necessary to dewax for some oilseeds such maize oil, rice bran oil, sunflower oil and cotton seed oil. At present, winterizing method is very popular to dewaxing. The crystallizing rate, crystallization temperature, maturing time vary with oil features.