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Describes physical refining of rice bran oil

reference:Writer:Click:24pubtime:2016-03-04 09:15:42【large middle small

  

 Rice bran oil free fatty acids by conventional alkali refining or physical refining removed, it can be removed by using other methods.

Physical refining its relatively simple process, high quality can be obtained directly and by-products of refined oil fatty acid, and raw material saving, no waste water pollution, product stability, refining rate, etc., more and more people's attention. Especially for high acid value oil, its superiority is more significant. It includes the pretreatment and distillation before distillation deacidification two stages. Since the quality of the physical pretreatment of refined oil plays a decisive role.
In recent years, physical refining of rice bran research focused on preprocessing.
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B.K.De and B.K.Bhattacharrya [11] containing fatty acid 4
0 ~ 124% after several degumming of rice bran oil dewaxing manner, physical refining of rice bran oil characteristics were studied after bleaching. the study
Show that low temperature (10 ℃) after physical refining of rice bran oil processing color, FFA
, The total amount of gum and wax, oryzanol, tocopherol levels were very good, appropriate
When the low temperature (17 ℃) is possible. At room temperature (32 ℃) or slightly below room temperature (25 ℃) dewaxing degumming, physical refining RBO quality unwelcome. Therefore, low temperature (10 ℃) dewaxing regardless of low or high FFA FFA oil etc. can get good color grease. Phosphorylated degumming (65 ℃),
Low temperature dewaxing (10 ℃), decoloration physical refined oil and water color water dewaxing degumming (10 ℃), refined oil decolorization physical color darker than the same temperature (65 ℃), in
Dewaxing higher temperatures (17 or 25 ℃) had no effect on the color; phosphoric acid degumming, dewaxing water (25 ℃),
Physical color than water decolorization refined oil unglued unglued substitute phosphorus; phosphoric acid degumming refining RBO tocopherol content is lower than the water degumming refining rice bran oil (RBO);
Separate water degumming (65 ℃) and low temperature 10 ℃) water dewaxing and better than phosphoric acid degumming (65 ℃) water dewaxing oil production quality. All test results show that in the United hypothermia (10 ℃) unglued
Physical refining of rice bran oil dewaxed to produce light color, free fatty acid (FFA) content is low, high tocopherol oryzanol and rice bran oil quality.
Rice bran oil, rice bran decoloration silica gel obtained by solvent extraction of rice bran oil, its color is dark brown, dark green-brown or greenish-yellow, depending on the degree of deterioration of stored rice bran, oil method and processing conditions. In general, rice bran oil, dark decolorization can not be completely removed, the more difficult the production of rice bran oil is clear and transparent, and light colors.
Rice bran oil using silica gel decolorization study by silica gel column percolation discoloration and decoloration of two silica gel mixed with oil mixed method. The disadvantage is that the mixing of oil through a silica gel column (especially Mao rice bran oil solvent extraction) slow flow. Decolorization conventional silica may be practical industrial refining process: degumming - a dewaxing - refining - decolorization - secondary dewaxing and deodorization modified to a silica gel column - percolation process - degumming - dewaxing - refining - decolorization and deodorization processes.
Rice bran oil Xinxiang Hongyang biorefining method biorefining technology for high acid rice bran oil refining, the principle means of microbial enzymes (1,3 effects lipase)
Under certain conditions can catalyze the esterification of fatty acids and glycerol between, make the most fat into fatty acid glycerides. Studies suggest that the optimal reaction conditions of high acid value of rice bran oil bio-refinery is: enzyme dosage 10% by weight of an oil pressure 133322Pa, temperature 70 ℃, 10% water, glycerol was added for the calculation of the amount (plus no excess glycerol improved significantly). They did the experiment, when Mao bran oil FFA was 30%, the reaction 1h, FFA decreased to 92%; the reaction 2h, free fatty acids decreased to 85%; reacted 5h and 7h; FFA decreased to 47% and 36%. After this biological refining deacidification of oil also some free fatty acid residue may be further removed after alkali refining method. On refining characteristic is concerned, according to the survey, the process Xinxiang Hongyang bio-refinery and significantly better than the combination of alkali refining process of alkali refining and physical refining and combining. Comparison with other techniques, use of enzymatic removal of acids and bases and process combined with high acid rice bran oil refining energy required is very low, high economic efficiency.
Bran oil deacidification method re-esterified vegetable oil acid removal method is one of the oil in free fatty acids FFA) by acidification into neutral glycerides, achieve the purpose of deacidification.
After degummed and dewaxed rice bran oil, glycerine re-esterification, the FA15 ~ 30% of the rice bran oil deacidification give effect to reduce the acid value. And then re-esterification with conventional alkali refining, bleaching jointly prepare light color edible oil. In this study, samples of rice bran oil re-esterification reaction at a temperature of 120 ~ 200 ℃, 5mmHg or under inert gas conditions, simultaneously with or without a catalyst, with or without the addition of glycerol. Mao bran oil is suitable for re-esterification between 180 ~ 200 ℃, use it over 50% of the theoretical excess glycerol in 2 h and FFA, a temperature of 200 ℃, it can be decreased from 15-3% to 62% at the same temperature, the reaction was carried out 4 ~ 6h, FFA content decreased only 1 to 2%, respectively; using a catalyst on the esterification was no response; under vacuum conditions can be effectively re-esterification. Industrial high FFA rice bran oil deacidification, after degumming and dewaxing, which added to the glycerin and acid as a catalyst, can be obtained by esterification deacidification effect.
Rice bran oil monoglycerides by esterification by alkali refining, bleaching and deodorizing or physical refining, high-quality rice bran oil can be obtained, depending on the color of their hair color of the oil.
Production costs and losses, the method when the refining of rice bran oil with high acid value, need industrial pure monoglycerides MG), the production of oil products too expensive, can be used in industrial production needs further study.
Using rice bran oil refining method of mixing mixed together Xinxiang Hongyang dewaxed oil and mixed oil alkali refining method to high FFA content in rice bran oil refining into low unsaponifiable matter content, color and light cooking oil were discussed. FFA contents were 3%, 205% and 30% of gross bran oil with phosphoric acid in the oil phase after degumming, calcium chloride and a surfactant in 15 ± 1 ℃, the hexane phase dewaxing crystallized laboratory Centrifuges for separation. Hexane was added to the oil has been degummed and dewaxed dubbed appropriate concentration of blended oil (30%, 4%, 60%), adding lye, washing soap, after evaporation of the solvent the oil was dried with 2% activated clay at 100 ± 1 ℃ decolorization. Mixed oil concentration of 60%, the color of the oil refining and consumption index can be improved. High FFA
Content of rice bran oil and mixed oil dewaxing then mixed oil refining bases, which can be refined into edible cooking oil.
The process does not require alkali refining and, no soap and water, the minimum amount of waste discharge, with economic advantages in industrial applications, broad prospects.