For the whole rice bran oil production line, including four workshops:
rice bran pre-treatment workshop, rice bran oil solvent extraction workshop, rice bran oil refining workshop, and rice bran oil dewaxing workshop.
1.Rice Bran Pre-treatment:
Rice brancleaning →extrusion → drying → to extraction workshop
Cleaning: Adopt the magnetic separator to removing iron impurities and rice bran& fine broken rice separation sieve to separate rice bran and fine broken rice.
Extrusion: Adopting the extruder machine can both improve the yield of rice bran oil and reduce the consumption. The extrusion, on the one hand, can make solution lipase in the rice bran passivated under high temperature and high pressure condition,then prevent the rice bran oil rancidity; On the other hand, the extrusion can make rice bran be porous material grain, and increases the materials bulk density, then improve the permeability and extraction rate which solvent reacts to the material.
Drying: The extruded rice bran contains about 12% water, and the best moisture for extraction is 7-9%, therefore, there must be effective drying means to achieve the best extraction moisture. Adopting counter-current dryer can make water and temperature meet with follow-up process requirements, and improve the oil yield, as well as oil quality.
2.Rich bran oil solvent extraction:
In our design, the Extraction line is mainly made up following systems:
Oil Extraction system: for extracting oil from Expanded rice bran to get Miscella which is mixture of Oil and Hexane;
Wet Meal Desolventizing System: for removing Solvent from Wet Meal as well as to toast and dry Meal for getting proper finished Meal Product qualified for animal feed;
Miscella Evaporation System: for evaporating and separating Hexane out from Miscella under negative pressure;
Oil Stripping System: for thoroughly removing residual Solvent to produce standard Crude Oil;
Solvent Condensing System: for recovering and circulating use of Hexane;
Paraffin Oil Recovering System: further recovering residual Hexane gas remains in vent air by means of Paraffin Oil to reduce Solvent consumption;
3.Rice Bran Oil Refining：
crude rice bran oil →degumming&dephosphorization →deacidification →Bleaching →deodorization →refined oil.
Oil refining is according to the different usage and requirements, utilizing the physical methods and chemical processes to get rid of the harmful impurities and needless substance in the crude oil, getting standard oil
4.Rice Bran Oil Dewaxing:
Dewaxing means by use refrigerating unit,to remove wax from the oil.
Main equipment introduction
The pre-cooling tank used here to decrease the temperature first, which save the cooling time in crystallizer tank.
The cooling oil is directly driven into the crystallizer tank for crystallization. The stirring speed is slow during crystallization, generally 5-8 revolutions per minute, so that the oil is evenly cooked and ideal crystal effect is achieved.
Crystal growth follow by crystallization, which provides condition for the growth of wax.
The crystal oil is filtered by self-pressing first, and when the filtration speed is flow, the variable- frequency screw pump is started, and the filtration is performed when adjusted to a certain rotation speed so as to separate the oil and wax.
The new technical of fractionation invented by our company has high advance technical, stable quality. Compare with the traditional winterization technical of adding filter aid, the new one has characters as follows:
(1) Don’t need to add any filter aid agent, the products are natural and green.
(2) Easy to filter, the product oil has high yield
(3) Pure by-product edible stearin, not contain filter aid agent and can use edible stearin production directly, no pollution.