The rice bran oil solvent extraction process need a set of machines to finish, Which includes solvent extractor, D.T.D.C toaster, evaporation and stripping tower and condensation and cooling machine.
The general rice bran oil solvent extraction process is as follows:
Rice bran oil solvent extraction process
1. Send rice bran material into leaching device after expanding.
2. Spray 6 # solvent oil (n-hexane) onto rice bran material, soak for a while, and get the mixed oil.
3. Separate the solvent and the oil through boiling and vaporizing system.
4. Dissolve and dry the dross which contains a certain amount of solvent.
5. Cool and recycle the solvent vapor.
Three kinds of rice bran oil extractor machine
Next, I will explain ten factors that will affect rice bran oil solvent extraction process effect:
① The properties of the rice bran material
A. Rice bran material particle size should be smaller, but the powder content should not be too high. And the surface area of rice bran material is as large as possible, which can increase the extraction efficiency.
B. The expansion material should have sufficient and uniform permeability, that is, the more pores in the material, the better.
C. Rice bran material to solvent and mixed oil adsorption ability is as small as possible, because the shell in the material embryo can absorb a lot of grease and increase the residual oil in the meal.
D. The rice bran material should have certain strength and cannot be foamed by the solvent. It requires the quality assurance in the process of steaming and frying and puffing, so as to make the pasting powder as mushy as possible to enhance the strength of the rice bran material.
② The thickness of the rice bran material embryo
In the process of embryo rolling, the thicker the slice is, the longer the extraction time is required, which is not conducive to improving the production efficiency and often increases the amount of residual oil in the meal. Therefore, we require the thickness of embryo to be 0.25 -- 0.3mm, but not too thin. Otherwise, the rice bran material embryo has no strength, which will affect the extraction effect.
③ The controlling of extraction temperature
In rice bran oil solvent extraction process, "extraction temperature" is the raw material temperature determined according to the distillation process of the solvent. In principle, the higher the extraction temperature is, the less residual oil in the meal. In general, the extraction temperature should be lower than the solvent boiling point 8-10 ℃.
④ The moisture content of the rice bran material embryo
In rice bran oil solvent extraction process, the moisture content of rice bran material embryo can’t be too high, or which can influence the dissolution of solvent to oil, also affect the penetration of solvent to material embryo. Therefore, the moisture content of the rice bran material should be less than or equal to 8%.
⑤ The permeability of solvent and mixed oil
In continuous rice bran oil solvent extraction process, it is important to accelerate the number of solvent and mixed oil permeable embryos in unit time to improve the extraction effect. Technically, the permeability is calculated based on how many kilograms the solvent or the mixture of oil flows through the surface of the material embryo in 1 hour and 1 square meter. If the permeability is less than 10.000kg/h·m2, the extraction time should be relatively prolonged, thus reducing the production capacity of the leaching device.
⑥ The thickness of the leaching layer
As long as the rice bran material structure strength high, not easy to be crushed or bubble material layer thicker, the thicker material layer can increase the capacity of the extractor. At the same time, in the same solvent ratio, material layer is thicker, the material layer on the surface of can contact with more solvent, and improve the efficiency of extraction. The material layer thickness of the crawler type leaching device used by us can reach 1000mm.
⑦ The concentration of the mixed oil
In our extractor, rice bran material and solvent is counter-current flow direction. The new entrants to extractor of rice bran material mixed with thick oil contact, and soon the hydrolysis of contact with the new fill into pure solvents, which not only can get thicker the mixture of oil, but also minimize the residual oil in the meal. Currently, our blend concentration is required to be between 24 and 28 percent.
⑧ The length of leaching time
Leaching time is counted from embryo material into to out of the extractor. The length of the leaching time should be according to the type of the extractor. We use the caterpillar extractor, including feeding, leaching, drain. The leaching time is about 100 min, and the shortest time is not less than 80 min.
⑨ The ratio of solvent
Solvent ratio is the ratio of the weight of the leached material embryo to the solvent used in unit time. To ensure the residual oil rate of the meal is less than 0.5%, the solvent ratio should be 1:0.8-1.4.
⑩ The way to spraying and draining of solvent
Our extraction method is:
Material embryo -- percolation extraction -- drain off -- percolation extraction -- drain off -- the meal
4-7 times spray can minimize the residual oil in the meal.
In general, many factors can affect rice bran oil solvent extraction process. So we should pay more attention to these factors in production, so that we can improve the efficiency of rice bran oil solvent extraction process, reduce leaching time and reduce residual oil in the dregs. If you are interested in our rice bran oil solvent extraction plant, welcome to inquiry and visit!