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.

Compositional Study on Rice Bran Oil after Lipase-Catalyzed Glycerolysis and Solvent Fractionations

Abstract: Rice bran oil (RBO) was modified through lipase-catalyzed glycerolysis. After 48 h reaction, the reactant (RBO-G, solved in hexane) containing 0.14 mg/mL of MAG, 0.19 mg/mL of DAG, and 0.93 mg/mL of TAG was obtained. Extending the reaction to 72 h resulted in 0.37 mg/mL of DAG with concomitant reduction in TAG (0.68 mg/mL). Two solvent fractionation methods, independent and sequential fractionation, were performed with acetone and hexane at 0, -8, -14, or -35 degrees C. The fraction with most unsaturated fatty acids (Sigma UFA) was liquid fraction from independent fractionation at -35 degrees C (-35 In) from hexane, showing 88.3%Sigma UFA content. Nevertheless, when yield (wt%) was considered, the highest amount of UFA was obtained from 0 In (liquid fraction from independent fractionation at 0 degrees C) with hexane, resulting in 82.3%Sigma UFA with 97.9 wt% recovery. Normal-phase HPLC was conducted for the compositional study of RBO-G. Overall, solid fractions from sequential fractionation at 0 degrees C (0 SeSo) and independent fractionation at -35 degrees C (-35 InSo) with hexane contained the high concentration of total MAG and DAG, ranging from 0.94 to 1.35 (mg/mL).

Alpha-tocopherol in vegetable oils.

Abstract: The alpha-tocopherol concentration was determined in cooking vegetable oils The lowest concentration of alpha-tocopherol was found in coconut oil Soybean oil, peanut oil and rice bran oil showed similar ranges of alpha-tocopherol concentration A high concentration of alpha-tocopherol was found in palm oil and in corn oil The combination of single vegetables oils affected the alpha-tocopherol concentration as shown in the samples of mixed oils The ratio of alpha-tocopherol to polyunsaturated fatty acids has been calculated

Partial discharge properties of ester oils having different molecular structures

Abstract: Partial discharge (PD) properties and dissolved gas analysis (DGA) are investigated on three kinds of fatty acid alkyl esters synthesized from palm oil, fatty acid methyl esters synthesized from soybean oil and from rice bran oil with low viscosity to be adopted in transformers. For comparison, the properties of rapeseed oil of vegetable oil having high viscosity are also investigated. The results revealed that the number of PD and average PD charge depended on the molecular structure of the ester oils. It is indicated that the number of PD of large molecular ester oils and ester oils containing double bonds at hydrocarbon part is relatively few. PD in the ester oils with high viscosity were triggered by bubble. DGA showed that there were no remarkable acetylene gases by PD in the ester oils, though hydrogen gas was generated. CO and CO 2 were also generated in the ester oils, especially remarkably generated by PD in ester oils containing double bonds at hydrocarbon part.

Exergetic evaluation of biodiesel production from rice bran oil using heterogeneous catalyst

Abstract: With the increasing interest in developing alternative fuel sources to fossil fuels, biodiesel is one preferred alternative. Several researchers have proposed the use of heterogenous catalyst but it is not commercially in use yet. Recently, more attention is being paid to improvement of the energetic performance and minimising the inefficiencies in the different process components, but not many literatures have shown how these inefficiencies are introduced during design of heterogeneously catalysed biodiesel production processes. This study aim to use exergy analysis to determine location, magnitude and sources of thermodynamic inefficiencies in a heterogeneously catalyzed rice bran oil biodiesel production plant. It demonstrates how improper placement of utilities can result to energy losses in a heterogeneously catalyzed rice bran oil biodiesel production plant and it comparatively examine how the exothermic energy of transesterification reaction can drive the system. Two rice bran oil biodiesel production plants are simulated. The first production plant simulated has hot utility supply to the reactor while the second is without hot utility supply to the reactor and both were defined as scheme 1 and scheme 2 respectively. The overall analysis showed that for scheme 1, exergy efficiency was 63.92% with 94.2% of the total exergy destruction taking place in the reactor while efficiency of scheme 2 was observed to improve to 75.15% with exergy destruction in the reactor reduced to 1.63%.