Rice bran has a low oil content and is easy to become rancid during storage, in order to achieve the ideal production effect during rice bran oil processing, rice bran oil factory often use the rice bran oil extraction method to make oil. The rice bran oil extraction method is to use n-hexane solvent that can dissolve oil to extract the rice bran oil.
When extracting rice bran oil, the rice bran material is immersed in the selected solvent to dissolve the oil in the solvent to form a mixed oil. The mixed oil is separated from the solid residue. The mixed oil is then evaporated and stripped according to different boiling points to vaporize the solvent into steam and separate it from the oil, thereby obtaining the extracted crude oil. The solvent can be used again after stripping, evaporation, condensation and recovery.
The small amount of solvent in the cake is not conducive to later processing and utilization. The rice bran oil plant can obtain dry cake after desolventizing and drying. The volatile solvent vapor during desolventizing and drying can also be recycled and used after condensation and cooling. In the rice bran oil extraction process, the oil yield of the oil mill and the crude oil quality obtained are affected by many factors, and the direct impact is the quality of the oil.
Before extraction, the rice bran should be expanded and extracted to adjust the moisture of the oil to make it loose and porous columnar, so that the oil and solvent can fully contact to obtain mixed oil. When extracting rice bran oil, the extraction temperature should be appropriately increased to accelerate the diffusion and strengthen the molecular thermal motion, reduce the viscosity of oil and solvent, increase the extraction speed, and reduce the residual oil rate in the meal within the same extraction time.
In addition, the contact mode between oil and solvent will also affect the oil yield of the rice bran oil mill. The contact mode between oil and solvent can be divided into soaking and spraying. The soaking of the embryo in the solvent is called soaking extraction, and the contact of the solvent with the embryo in the spraying state is called spraying extraction. The extraction time of different extraction methods is also different. Generally speaking, the longer the extraction time within the appropriate range, the higher the oil yield, but it should also be determined according to the actual situation of the oil mill to control the production cost and production time.
During the rice bran oil extraction process, the rice bran oil extraction machine selected by the oil mill will affect the actual production of the rice bran oil mill. Here we recommend Huatai Oil Machinery Manufacturer. The manufacturer has strong technology and strictly controls the quality of equipment. The rice bran oil extraction production line by Huatai has stable performance and long service life, and is sold to many regions at home and abroad.
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