An overview of rice bran oil solvent extraction process technology
Rice bran oil solvent extraction process technology use extracting principle, choosing organic solvent(n-hexane) contact with pretreated rice bran by soaking or spraying, and make rice bran oil is dissolved to get miscella.
Rice bran oil solvent extraction process technology is the most popular technology in rice bran oil production process, because rice bran belongs to low oil content oil seed, only 20%. If you use normal pressing method, the oil residue in the cake is about 7%. But by rice bran oil solvent extraction process technology, the oil residue can be less than 1%. On the other hand, because of low oil content, above 30TPD rice bran oil solvent extraction plant has the most economic benefit.
Rice bran oil solvent extraction process flow chart
Rice bran oil solvent extraction process technology mainly include four process: rice bran oil solvent extraction part, miscella processing part, wet meal DTDC system and solvent recovery part.
But before solvent extraction, rice bran need to be pretreated by series of machines, especially puffing machine. Because rice bran is easy of rancidity if no puffing. Thus, it is better to process them within 48 hours. On the other hand, pretreatment can also make rice bran reach the best condition for solvent extraction, and help extract maximum oil. The following is the detailed explanation about rice bran oil solvent extraction process technology, and wish it will help you understand.
The equipment used in rice bran oil solvent extraction plant
1. Rice bran solvent extraction part:
In extractor, soak or spray organic solvent (n-hexane) on processed rice bran to dissolve oil. Then you will get two parts: one is the mixture of solvent and rice bran oil, called miscella, then other is the mixture of solvent and meal, called wet meal.
2. Wet meal DTDC system:
The wet meal from extractor will be sent in to DTDC system, which means desolventizing, toasting, drying and cooling four steps are in one machine. It is mainly used to separate the solvent from the meal, then the dried meal will be sent to meal silo for storage or sold to make animal feed. The solvent will be also recycled and reused in the last part--solvent recovery part.
3. Miscella processing part:
This part is to separate the solvent from miscella by first evaporation, second evaporation and stripping. And then the pure crude rice bran oil will be pumped into oil tank, and the solvent will be recycled and reused in the last part--solvent recovery part.
4. Solvents recovery part:
This part is to recycle the solvent from miscella processing part and wet meal DTDC system, and then reuse in next production. Usually to process 1T rice bran, the solvent ratio is 0.8-1.2. Besides, the loss of solvent oil is very little, you may need add a few every few months.
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