Rice Bran Oil Extraction Machine
Rice bran comes from the by-products of rice processing, because the raw materials and processing techniques used for processing rice bran are different. The composition of rice bran is not exactly the same.
Generally speaking, rice bran contains an average of 15% protein, 16%-22% fat, 3%-8% sugar, 10% water, and about 125.1KJ/g of calories. Most of the main fatty acids in fat are oleic acid, linoleic acid and unsaturated fatty acids, and contain high amounts of vitamins, phytoalcohol, dietary fiber, amino acids and minerals. Therefore, rice bran can be further processed to extract relevant nutrients, such as combining with bean curd residue to extract riboflavin and calcium phytate, rice bran can be used to extract rice bran oil, and rice bran oil contains about 4% unsaponifiable matter. Including a large amount of vitamin E, sterols, oryzanol and other biologically active substances, medical research shows that rice bran oil has the functions of removing cholesterol in the blood, lowering blood lipids, promoting growth and development of the human body, and has certain medicinal value. It is recognized as a nutritious and healthy oil at home and abroad .
Rice bran oil is easily absorbed by the human body, with an absorption rate of over 90% after eating. It also has good oxidation stability and excellent flavor. Defatted rice bran can also be used to prepare phytic acid, calcium phosphate and inositol, etc.; rice bran particles are fine in color Pale yellow. Easy to add to baked goods and other rice bran-fortified foods; at the same time due to the low content of soluble fiber. Rice wax, rice bran and β-sitosterol in rice bran all have the effect of lowering blood cholesterol. There are also many studies and reports on rice bran replacing corn and other raw materials in animal feed, reducing feed cost and improving economic benefits.
The raw material of the rice bran oil extraction machine is generally fresh rice bran, and the oil extraction process is divided into three stages: rice bran pretreatment, rice bran leaching and oil extraction, and rice bran crude oil refining. Rice bran pretreatment means that the rice bran is extruded or granulated, and then dried. Then enter the leaching workshop to extract oil. Rice bran contains lipolytic mold. After puffing or granulation, the rice bran destroys lipolytic mold, which has a fresh-keeping effect on rice bran, slows down or avoids the progress of rancidity, and can be stored or delayed for processing.
Process flow of rice bran oil extraction:
Due to the low oil content of rice bran and other reasons, we generally do not choose the pressing process. One-time extraction of rice bran oil is generally the preferred oil production process. The by-product of one-time extraction of rice bran oil can be further processed to extract rice bran protein.
Pretreatment workshop machine part of rice bran oil extraction machine
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1) The main equipment of the pretreatment workshop are:
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Bran separation screen, softening and conditioning pot, extruder, flat dryer, etc. the
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2) The pretreatment process of rice bran:
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Rice bran--cleaning--rice bran separation--expansion or granulation--drying--extraction--rice bran meal and rice bran crude oil.
When the rice bran enters the extruder or granulator, the bran must be separated in advance. Because the raw materials contain more impurities such as broken rice and coarse bran shells, it will accelerate the wear of the extruder. More importantly, the broken rice contains more starch, so that the rice bran cannot form proper pressure during the expansion process, and it will Make the structure of the puffed material loose, not achieve a good puffing effect, and easily increase the powder degree of the leached material and the oil absorption of the starch, which will affect the residual oil of the dry meal and affect the oil yield of the leaching
The moisture content of the raw material rice bran has a great influence on the work of the extruder, which directly determines the elasticity and plasticity of the extruder. If the moisture content of rice bran is too high, the elasticity of the material is poor, and it cannot generate enough pressure and heat to properly destroy oil cells and enzymes; if the moisture content is too low, the plasticity of the material is poor, which will cause the puffing temperature to be too high, the material will be coked, the color of the material will be deepened, and it will be easy to clog Extruder, also can not produce good puffed material. According to the results of use, it is advisable to control the moisture content of rice bran at 11-13% before entering the machine. The temperature of the machine and the ambient temperature also have a certain influence on the puffing effect and output. The puffing effect and yield of preheating raw rice bran are better than those without preheating rice bran. The output of the extruder in summer is about 20% higher than that in winter. This is because the warm-up time for the extruder to work normally is shorter due to the higher room temperature. the
Advanced puffing technology reduces powderiness and improves permeability
Reduce rice bran meal residual oil, improve rice bran meal quality and soluble protein content
The extracted crude oil has good quality and less impurities
Rice bran undergoes a series of complex physical and chemical changes through the instantaneous action of high pressure (less than 1.5 MPa), high temperature (105-140°C), shearing, friction, and expansion of the extruder. Expanded particles with a microporous structure and a certain strength with a length of 5mm. The moisture content of rice bran decreased from 11-13% before puffing to 7-9%, and the oil content increased by 0.5-2 percentage points accordingly. During the storage process, the water content of puffed rice bran basically did not change, and compared with raw bran, the water content increased slowly. Puffing promotes the breakage between starch and protein molecules to gelatinize, deform and recombine, and destroys oil cells, so that oil molecules are in a free state. The gelatinization temperature of rice starch is 58-61°C. A small amount of starch forms a complex with the oil released from cell rupture during the extrusion process, and the active starch and active protein produce viscosity to stick the embryos together. The oil is fully mixed and distributed evenly. Once released from the extruder, the moisture in it will After being volatilized very quickly, after drying and cooling, the expanded rice bran particles with certain extrusion strength, not easy to be crushed, powder-free and internal microporous structure are formed. The bulk density of puffed rice bran has increased from 300-395kg/m3 to 470-625kg/m3, which is an increase of more than 55%. Therefore, the penetration rate and penetration rate of the leaching solvent are increased to 6 times that of the traditional leaching process.
The extruded rice bran particles of the rice bran oil extraction machine have excellent permeability, and only 40 minutes of leaching time can reach 0.5% residual oil rate. Under the instantaneous (less than one minute) high temperature treatment of the extruder, the content of free fatty acids in rice bran is significantly reduced, and the acid value is reduced by about 3mgKOH/g oil, and various active enzymes in rice bran, especially lipase and lipoxygenase , lipase and harmful bacteria have been inactivated or killed (for example, bacterial lipase is inactivated at 50-75°C), which effectively inhibits the rapid rise of acid value and greatly improves the quality of rice bran and storage life. Stability, so that the storage period of puffed rice bran is extended to 3 to 7 months and still meets the oil production standard. Instant puffing minimizes damage to oil quality. It takes about 45 to 90 minutes for a traditional vertical steaming and frying pan to raise the material embryo to the steaming and frying temperature. Due to the appropriate temperature, humidity and time, the acid value of rice bran will increase and the color will deepen during this process, which is not conducive to the subsequent rice bran. Oil refining. the
Cooling: The rice bran just coming out of the extruder, due to the high temperature, the vaporized water is not completely volatilized, so it must be cooled naturally or forced to make it a good extruded material with certain performance and strength. If it is stored directly without complete cooling, the powderiness of the puffed material will increase, and mildew will easily occur, and the acid value will increase. Good puffed rice bran after cooling greatly reduces the content of bran powder. Excessive bran powder content will generate fog and reduce the yield of refined rice bran oil. Bran powder will also settle in the oil tank and damage equipment such as centrifuges, heat exchangers, and oil pumps.
One-time extraction process of rice bran oil extraction machine
The rice bran oil extraction machine is mainly divided into three workshops: pretreatment and puffing workshop, leaching workshop and refining workshop. the
The rice bran, a by-product of the rice polishing factory, enters the pretreatment workshop of the oil soaking factory after the bran is separated. First, it is cleaned to remove impurities. The content is relatively high, and it needs to be lifted to a flat-panel dryer for drying and then transported to the leaching workshop by a scraper machine. the
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The main machine parts of the rice bran oil extraction machine;
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1) The main equipment in the leaching workshop are: leaching device, evaporator, stripping tower, evaporator, condenser, etc.
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2) Leaching process:
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Rice bran grain---solvent leaching---mixed oil---evaporation---stripping---rice bran crude oil
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Rice bran containing wet meal---steam off---finished meal
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3) The puffed rice bran grains enter the extractor, and are extracted with an organic solvent to obtain a mixed oil, and the solvent is evaporated by evaporation and air stripping to obtain rice bran crude oil. The rice bran after the oil is extracted by the solvent becomes the bran meal, and after the solvent is evaporated, it becomes the finished meal. the
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Refining workshop equipment for rice bran oil extraction machine
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1) Main stages of refining: degumming, dewaxing, decolorization, deacidification, deodorization, degreasing
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2) Simple process flow:
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Crude rice bran oil --- degumming, washing, drying --- dewaxing --- decolorization --- deacidification, deodorization --- degreasing --- refined oil. the
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3) Rice bran crude oil is degummed by heating water and phosphoric acid, dewaxed by winterization, deacidified by alkali refining, decolorized by adding clay, deodorized by vacuum and degreased to become refined refined oil.
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Rice bran oil is the oil obtained by extracting and separating rice bran oil through extraction process. It is divided into two types: rice bran oil and rice oil: rice bran oil is extracted from rice bran (the protective cortex of rice such as skin, seed coat, and outer endosperm), and rice bran oil is extracted from rice oil (rice germ and aleurone layer in clean production The oil extracted from the precision milled rice in the workshop) is rice oil.
Choose to buy rice bran oil extraction machine, please consult Zhengzhou Dayang Company, we will provide you with more rice bran oil processing technology and knowledge.
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