Rice bran oil production process
Rice bran oil is the oil extracted from the hard outer brown layer of rice after chaff (rice husk). It is mainly used in East Asia, such as Japan and China. However, due to its complex refining process and high cost, it has not been popularized. This passage will introduce rice bran oil production process in detail.
Rice bran oil
Rice bran oil is an edible oil with high degree of unsaturation. It is generally suitable for cooking, and its fume is less greasy. High quality rice bran oil can also be directly drank, and can be used to make cold dishes.
The whole rice bran oil production process includes three main steps: rice bran oil pretreatment and pressing plant, rice bran oil solvent extraction plant and crude rice bran oil refining plant.
Rice bran oil production process
1. Rice bran oil pretreatment and pressing plant:
Rice bran oil pretreatment and pressing plant is a very improtant section in rice bran oil production process. It will influnence the quality of rice bran oil.
Rice bran oil pretreatment process:
rice bran → magnetic box → separator → quenching and tempering → puffing machine → drying → to extraction workshop
1). Rice bran:
It’s the shell and embryo of the rice. The oil content in the rice bran is about 18-22%. The rice mill can supply the rice bran.
2). Magnetic box:
Clearing the iron impurity which might be in the rice brain. Since in the process of puffing, the iron impurity will be harmful to the screw of extrusion machine, affect the puffing effect.
Removing the chaff and broken rice in the rice bran, in case of they will influence the oil yield and the desolventizing of wet meal in the next process.
4). Quenching and Tempering:
It is the process of preheating so that to improve the temperature of the rice bran before puffing.
5). Puffing machine:
This machine can make the rice bran becoming porous columnar structure from the original pulverized state. This is good for the oil extraction part and improve the oil yield.
The moisture of rice bran comes from the bulking machine is too big and the temperature is too high for direct extract, so the rice brain are usually dried and cooled by plat dryer.
2. Rice bran oil solvent extraction plant:
After pretreatment and pressing plant, the rice bran will become meal. Since the rice bran belongs to the low oil content, so rice bran solvent extraction plant can ensure the max oil yield of rice bran.
Rice bran oil solvent extraction process:
extractor → mixed oil → 1st and 2nd evaporation → stripping tower → crude oil
Wet meal → DTDC toaster → rice bran cake
(1). Solvent pumps:
continuously spray solvent to the rotary-type extractor
(2). Roary extractor:
Spray and soak the pretreatment rice brain with solvent so that oil fats can be dissolved in solvent(form miscella). After processing, you can get wet meal and miscella (mixed oil).
usd to separate the solvent from the wet meal.
(4). Miscella tank 1st:
pump the miscella (oil with solvent) in to the miscella 1st , and then add 10% saline water to it. The phospholipid and impurities in the miscella will react with the saline wter, at last the reactant precipitate, reaching the goal of purifying.
(5). Miscella tank 2nd:
the purified miscella will be pumped into it.
(6). 1st evaporator, 2nd evaporator:
used to separate the solvent from the oil. After this process, the solvent can be removed 85%.
(7). Miscella stripping:
it will remove the remaining solvent in miscella. And the solvent will be discharged to condenser for recycling.
used to cooling the solvent gas separated from the wet meal and miscella for recycling.
3. Crude rice bran oil refining plant
Rice bran oil refining plant is the last step of rice bran oil production process. The oil we got is standard edible oil which can be sold in the supermarket.
Rice bran oil refining process
Crude rice bran oil → degumming and deacidification→ decolorization →deodorization → winterization refined oil.
The rice bran oil is special, so it’s difficult to become 1st grade rice bran oil. We have rich experience in rice bran oil refinery and can help you getting the 1st grade rice bran oil.
1). Degumming and deacidification:
The gumming is moved by phosphoric acid and hot water. There are two ways to move the acid in the rice bran oil. One is chemical way, the other one is physical way. The chemical way is using NaOH to react with acid. This way is suitable for the capacity of 5-30T per day. The physical way is using steam and centrifugal to move the acid. This way is used for capacity from 30-2000T per day.
This step is used to adjust the color of the oil. You can control the color of the rice bran according to the requirement of your market.
The function of this step is to move the special smell in the oil. This is an important standard for refined oil.
This is special step for rice bran, because there is much wax in the rice bran oil. After move the wax in the oil, it can be liquid in a low temperature. This step also can improve the taste of refined rice bran oil.
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