Showing papers on "Rice bran oil published in 1985"

Non-polluting non-toxic drilling fluid compositions and method of preparation

Abstract: The present invention relates to plant or vegetable oil-based drilling fluid compositions which are non-polluting and non-toxic, and which provide improved lubricating properties and stability for use under widely-varying load and pressure drilling conditions. The compositions are primarily based on plant or vegetable oils comprising essentially extended long-chain carboxylic acids having minimal double and triple bonds of the 12 to 24 carbon atom series. The oils are selected from the group consisting of peanut oil, rapeseed oil, soybean oil, sunflower oil, corn oil, cottonseed oil, rice bran oil, safflower oil, castor bean oil, palm oil and mixtures thereof. Suitable antioxidants and emulsifiers as well as desired viscosifiers and fillers are included in the compositions which are adapted to addition to water and/or brine for desired rheological properties for drilling fluid uses. The compositions are free of aromatics and petroleum based derivatives, the natural oils bieng emulsified with chemically-similar constituents for long-term stability and multiple drilling uses.

Comparative study of physical methods for lipid oxidation measurement in oils

Abstract: For the determination of lipid oxidation in oils, electrical, optical, spectroscopic and extraction methods were investigated using rice bran oil and doubly-fractionated palm olein as model systems. The oxidized polar components and dielectric constant of rice bran oil increased very similarly with those of double-fractionated palm olein. In the case of rice bran oil, all of the test methods were shown to possess good statistical correlations. Polar components, dielectric constant, refractive index and polymer content showed relatively better correlations. It was shown that diene and triene content determined by spectroscopic methods was not suitable for more saturated oils such as palm olein.

Effect of caustic refining, solvent refining and steam refining on the deacidification and color of rice bran oil

Abstract: Degummed rice bran oil was deacidified by caustic, solvent and steam refining processes. The steam refining process was optimized through a series of experiments with varying refining times (1–5 hr), temperatures (220–280 C) and amounts of steam (4–20%), at a pressure of 4 mmHg. The most significant factors affecting the degree of deacidification were the refining temperature and amount of steam. The correlation coefficient between quadratic equation obtained and experimental results was 0.96. Acid value and color of steam refined oil were not as good as those of caustic refined oil, but steam refining showed better retention of natural antioxidants than caustic or solvent refining. Steam refining is preferred for deacidification of rice bran oil because of reduced neutral oil loss and elimination of soap production.

Extraction and refining of edible oil from extrusion-stabilized rice bran

Abstract: Rice bran oil extracted from extrusion-stabilized bran was processed to a high quality salad oil. Stabilization prevented free fatty acid formation in rice bran prior to solvent extraction of the oil and thus increased the yield of refined oil. The flake form of the stabilized bran allowed rapid solvent percolation and efficient lipid extraction. Degumming soon after extraction removed a larger proportion of the gums and waxes and resulted in a higher yield of refined oil than if this procedure was delayed. Alkali refining was found to be most efficient with a concentration of 16° Be (2.77M) NaOH and 0.5% NaOH excess. Acid activated clay was effective in removing color from the refined oil, and the addition of charcoal did not improve bleaching ability. Stabilization temperatures, within the range studied, did not appear to affect the bleached oil color. Color was measured spectrophotometrically at 537 and 612 nm.

Effect of Oxalic and Phosphoric acid on Degumming of Rice Bran Oil

Abstract: Solutions of 4.8 and 12% oxalic and 85% phosphoric acid were used for degumming of crude rice bran oil. 96.6% of total phosphatides was removed by degumming with either 2ml of 85% phosphoric acid or 20ml of 4% oxalic acid when added to 1kg of crude rice bran oil. Yields after degumming with oxalic and phosphoric acids were 63.6% and 61.0%, respectively.