Rice bran oil

About: Rice bran oil is a research topic. Over the lifetime, 2102 publications have been published within this topic receiving 32504 citations.

Combustion characteristics of rice bran oil biodiesel in an oil burner

Abstract: The concept of biodiesel as an alternative fuel is not an overnight thought, but the escalating prices, pungent emission gases and non-ecological behavior of fossil fuels has constrained the researchers to take the necessary steps. Biodiesels which are renewable in nature and having environmental friendly attribute have shown the potential to be the perfect replacement for the diesel fuels. Similarly, this study demonstrates the characteristics of Rice Bran Oil (RBO) which can be used as a latent substitute for diesel products. RBO is a vegetable oil, which is extracted from the rice bran (by-product of rice grain). Since rice is the staple diet for more than half of the world population, the quantity of RBO that can be extracted is enormous. In this study, the converted RBO into biodiesel (RBOBD) was blended with diesel to produce B5, B15 and B25 to determine physical properties and combustion performance. Owing to highly packed molecules of RBOBD, the properties such as density, kinematic viscosity and surface tension are higher in RBOBD and its blends than diesel. In contrast, the calorific value is lower. In the combustion test, the highest wall temperature is achieved at stoichiometric fuel mixture, while among the fuels, the wall temperature decreases as the biodiesel proportion increases in the blends. Moreover, in B25, emissions such as CO and SO 2 are 68% and 50% lower than that of diesel respectively. However, due to the additional oxygen present in the biodiesel structure, NO x emission of B25 is 15.67% higher than diesel.

Fractional extraction of rice-bran oil and its esters with supercritical carbon dioxide

Abstract: The fractional extraction of rice-bran oil and its esters with supercritical carbon dioxide was studied at 313-373 K and 8.2-19.8 MPa, using an entrainer or a separation column. A column was effective for fractionating the fatty acids in the extracted rice-bran oil, while an entrainer enhanced the extraction efficiency of the rice-bran oil. No significant difference existed in the fatty acid composition of the oils extracted with supercritical CO[sub 2] alone and supercritical CO[sub 2] containing an entrainer. The degree of fractionation of the fatty acid esters from rice-bran oil increased with the temperature in the column. At 343 K, the proportion of palmitate in the extracts reached a maximum of 86% in the early fractions, but oleate and linoleate were not fractionated. The use of a column packed with silica gel-supported silver nitrate was extremely effective for fractionating fatty acid esters. Palmitate and oleate, which constituted 94% and 91% of the fatty acid esters in the initial rice-bran oil esters, were recovered in 91% and 81% purity, respectively, but the degree of recovery and the purity were both lower with linoleate than with oleate.

High-acid value rice bran oil esterification depickling process

Abstract: The invention relates to an esterification deacidification process for high acid number rice bran oil, and the process can well solve the problem of a low refining rate. The esterification deacidification process for high acid number rice bran oil comprises grease pretreatment, namely two steps of degumming and decolorizing. A decolorized substance is obtained after the decolorizing, and then esterification deacidification is carried out. The concrete operating method comprises the following steps of: adding glycerin after the decolorized substance is stirred and heated at a vacuum degree of 0.09 MPa; adding a catalyst of zinc oxide or zinc to carry out a catalytic reaction to generate low acid number rice bran oil with an acid number of 5-7mgKOH/g. The zinc oxide or zinc which is taken as the catalyst of the esterification deacidification of the high acid number bran oil can effectively boost the esterification reaction and rapidly reduce the acid number; simultaneously the process overcomes the problems of the low refining rate lying in a traditional refining method and a great deal of sewage produced by a chemical alkali refining method; the zinc oxide or zinc has a low price, thereby reducing production cost; compared with other chemical esterification catalysts, the zinc oxide or zinc has a very low toxity, thereby being very suitable for the production of edible grease.

Rice, miscellaneous grain, fruit vegetable biological preservative and preparation technique thereof

Abstract: The invention relates to a biological antistaling agent of rice, minor cereals, fruits and vegetables and a compound process thereof which comprises the following steps: preprocessing konjac powder: extracting konjac glucomannan from the konjac powder by a ultrasonic extraction method; preprocessing cassava powder; preparing solution A: evenly mixing isometric konjac glucomannan and the processedcassava powder with agar, wheat germ oil and water; preparing solution B: adding rice bran oil, lecithin, lindera glauca oil and etherifying agents into water for homogeneity; preparing the biological antistaling agent: mixing the solution A and the solution B and adding alpha-amylase and emulsifier; packaging and storing. The product mainly comprises the konjac glucomannan, the cassava flour andcassava etherate. The biological antistaling agent of rice, minor cereals, fruits and vegetables and the preparing process thereof of the invention leads the products to have good antistaling effect and can be widely applied to various food antistaling fields and has the advantages of wide raw material sources, simple preparing process, high efficiency and low cost.