Rice oil production line
Rice oil is also called rice oil. With its balanced nutritional ratio, rice oil has the reputation of "paddy gold" and is a healthy edible oil recommended by the World Health organization. Rice oil is rich in antioxidant oryzanol, which can regulate human autonomic nerves, improve sleep, relieve fatigue, and improve sub-health. The unsaturated fatty acids in rice oil are as high as 80%-85%.

　　Rice oil refining equipment
Main features: Adopting physical refining process, no need to deacidify through alkali refining, avoiding the loss of neutral oil, and greatly reducing the production cost.
Process flow: The crude oil is pumped into the oil refining pot for degumming and neutralization. When the oil and soap are obviously separated and sink quickly, stop stirring, let it stand, and then suck out the upper layer of clear oil to wash with water. Put the saponaria from the bottom emptying tube to the saponaria bucket. When the saponaria contains more oil, stop putting the soapstock, and the soapstock is pumped into the soapfoot pot. The remaining oil in the refinery tank is mixed into the next tank to continue. The clean oil transferred from the refining tank is washed with water and then sent to the decolorization tank for adsorption decolorization.   The decolorized oil is pumped into the gas separator at a constant flow rate through a pump, and the flow rate of the oil is adjusted by a flow meter. In the gas separator, oil is sprayed out through multiple nozzles on the feed pipe, and a high vacuum with an absolute pressure of about 3 mmHg is maintained in the gas separator to release a small amount of air infiltrated into the oil. The oil comes out of the gas separator, is pumped into the oil-oil exchanger, exchanges heat with the hot oil from the deodorization tower, and is heated to at least 180°C. From the oil-oil heat exchanger, the oil flows into the heat-conducting oil furnace heater and is heated to 260°C. The heat-conducting oil is heated to 290°C in the heat-conducting oil furnace and is recycled in the entire process. The hot oil to be deodorized enters the combined deodorization tower from the heat-conducting oil heater, where fatty acids and other relatively volatile odor substances are stripped out by direct steaming in the packing section, and then enters the plate section for deodorization and thermal decolorization. When processing oils with low acid value or low acid value of the finished oil, it is not necessary to pass through the packing section and directly deodorize and thermally decolorize the plate section. The oil after deacidification and deodorization is discharged from the combined deodorization tower, pumped into the heat exchanger to exchange with the oil to be deodorized, and then enters the cooler, where it is cooled by water. After cooling, the oil temperature is not higher than 70°C, and then passes through the fine filter. Carry out insurance filtering, and then store in the product oil tank for storage. For deodorized rice oil, tea seed oil, corn germ oil and other oils with high fat (wax) content, further dewaxing and degreasing should be carried out.

Rice oil contains a series of impurities such as peptizing impurities, free fatty acids, pigments, off-flavor substances and waxes. To make wool rice oil into edible rice oil, rice oil refining equipment needs to be used to refine wool rice oil to remove these impurities. After being refined by the rice oil refining equipment, the rice oil has an orange-yellow and transparent color, no rancidity and odor, moisture content less than 0.2%, and residual impurities less than 0.3%.
1. Hydration and degumming

Hydration degumming can remove the peptic impurities in rice oil. First heat the crude rice oil to 65-70℃, then add hot water at the same temperature equal to 5% of the oil under stirring, and stir for 40-60min. During stirring, the peptic impurities gradually agglomerate into clusters due to their hydrophilicity. When the temperature rises to 80°C, stop the temperature increase, stir for about 25 minutes, stand for 4-6 hours, and then discharge the clumps of gum to complete the hydration degumming.
2. Alkali refining and deacidification

Alkali refining deacidification mainly removes free fatty acids in rice oil through acid-base neutralization. Before alkali refining, the acid value of the rice oil should be determined first, and then the amount of alkali added should be calculated according to the following formula:

Solid alkali dosage (kg) = rice oil quality (t) X acid value X 0.713 (Note: 0.713 is the ratio of the molar mass of sodium hydroxide to potassium hydroxide.)

After calculating the solid alkali dosage according to the above formula, first make it into a dilute lye with a concentration of 18-20ºBé, add it to the hydrated rice oil, and stir at the same time. After the acid-base neutralization reaction, the by-product soapstock will be formed. When the soapstock appears obviously, the steam will increase the temperature (1℃/min). After the rice oil and the soapstock are obviously separated, the heating will be stopped, but it is necessary to pay attention to the heating temperature. Above 80°C. Hot brine with a concentration of 3%-5% can be added during alkali refining to avoid emulsification of oil and mixing of water and oil. When the soapstock is gray-black and sinking, stop adding salt water, continue to stir for 10 minutes, and let it stand. When the soapstock has completely settled to the bottom and the oil is in a thin paste state, release the soapstock.
3. Washing

In order to prevent the rice oleic acid value from rising again, and to ensure the decolorization effect, it must be washed. Heat the alkali-refined rice oil to 80~94°C, add boiling water with 10%~15% oil content while stirring, stir for 15 minutes, and let stand for 1~2 hours. If the ph value of the wastewater is close to 7, it can be discharged, otherwise the washing step will be repeated until the ph value of the wastewater is close to 7.

4. Dehydration

Dehydration is to provide a dry environment for decolorization to achieve a better decolorization effect. When dehydrating, heat the rice oil to 105~110°C and stir it until there is no foam on the oil surface. The moisture content of rice oil after dehydration should be less than 0.2%.

5. Decolorization

The purpose of decolorization is to remove the pigment in the rice oil so that the color of the rice oil meets the standard. When decolorizing, heat the oil to 95~100℃, then add the clay and stir to make the clay absorb the pigment in the oil. The amount of clay added is about 2% of the weight of rice oil. After stirring for 0.5 hours, take a sample and observe, if it meets the standard, you can enter the next process. Otherwise, the decolorization must be repeated until the oil is yellow and translucent.
6. Deodorization

Deodorization is mainly to remove the odorous substances in rice oil, including ketones, aldehydes, and sulfur compounds. These substances are present in rice oil, which makes the oil emit peculiar smell and affects the flavor of the oil, so it should be removed. Deodorization usually involves passing direct steam under vacuum to raise the oil temperature to above 220°C, treating it for 4-6 hours, and then reducing the oil temperature to 40-60°C before transferring to the next refining process.

7. Dewaxing
The wax content in rice oil is generally 3%-5%. The wax cannot be absorbed by the human body and has no edible value. It needs to be removed to avoid affecting the quality of the oil. When rice oil is dewaxed, it goes through a series of processes such as heating, heat exchange, cooling, crystallization, crystallization, and filtration. After filtration, the wax in the oil can be removed. The filtered oil is pumped into the plate heat exchanger for heat exchange with the undewaxed oil and then stored in storage to obtain refined rice oil.


When refining rice oil, choose a suitable rice oil refining equipment to ensure that a good refining effect is achieved, and it must also meet your own budget requirements. There are three common types of rice oil refining equipment: 1-20 tons/day rice oil intermittent refining equipment, 10-50 tons/day rice oil semi-continuous refining equipment, and 30 tons/day or more rice oil full continuous refining equipment. In order to select the right rice oil refining equipment, you can contact the rice oil refining equipment manufacturer Guorui Oil. Guorui Oil has an experienced team of engineers, who can recommend the appropriate type of rice oil refining equipment based on your crude rice oil quality parameters, rice oil refining processing capacity, quality requirements for refined rice oil, and investment budget. .