Bleaching of oils

Use Seed disinfectant, dentrifices, dough conditioners, antiseptic, bleaching of oils, modification of starches, high-temperature oxidation. 

For bleaching of oils and fats, bentonite clays are used. These commercial bleaching clays are of two types e.g. natural (bentonites) and activated (montmorrilonites of suitably enriched ions by chemical processing) clays. The bleaching clays are intimately mixed with oils for specified time and... 

The principal disadvantage of absorption bleaching is the problem of disposal of spent bleaching clay. Oil absorbed on the clay is exposed to air and is generally too oxidized to recover. Furthermore, spontaneous combustion of the oil-laden clay is a possibiUty in a landfill. Incineration of the spent clay along with sohd municipal waste to recover otherwise wasted energy is an attractive possibiUty. 

Hydrogen peroxide is also used to bleach soHd surfaces such as wood (qv) or linoleum, and to improve the color of oils and waxes. 

The term three-phase fluidization, in this chapter, is taken as a system consisting of a gas, liquid, and solid phase, wherein the solid phase is in a non-stationary state, and includes three-phase slurry bubble columns, three-phase fluidized beds, and three-phase flotation columns, but excludes three-phase fixed bed systems. The individual phases in three-phase fluidization systems can be reactants, products, catalysts, or inert. For example, in the hydrotreating of light gas oils, the solid phase is catalyst, and the liquid and gas phases are either reactants or products in the bleaching of paper pulp, the solid phase is both reactant and product, and the gas phase is a reactant while the liquid phase is inert in anaerobic fermentation, the gas phase results from the biological activity, the liquid phase is product, and the solid is either a biological carrier or the microorganism itself. 

German Society for Fat Science (2001) Bleaching of edible fats and oils. 

Palm Soap.—Curd soap, made of a mixture of one-half lard, one-third bleached palm oil, and the remainder olive oil or spermaceti, constitutes the body of palm soap. Ite natural odor is that of the violet, which is sometimes stimulated by the addition of a little attar of portugal, with a lesser portion of attar of cloves. 

The Editor thinks that some means might be adoptod for using this salt In the bleaching of palm oil, et cetera, Instead of the chromate it [s cheaper, and it contains more of available oxygen. 

Linoleum -m drying oils pRYING OILS] (Vol 8) -m fats and oils [CARBOXYLIC ACIDS - ECONOMC ASPECTS] (Vol 5) -m fats and oils [CARBOXYLIC ACIDS - MANUFACTURE] (Vol 5) -m soybeans and other oilseeds [SOYBEANS AND OTHER OILSEEDS] (Vol 22) -H202 bleaching of [HYDROGEN PEROXIDE] (Vol 13)... 

OSI results range from 4 hr at 110°C for refined, bleached, deodorized oil, to 80 hr at 110°C for high-stability frying oil (Stauffer, 1996). Because the OSI can be determined at various temperatures, the temperature of the test should always be specified when reporting OSI results. 

Dusting of bleaching powders has to be prevented to avoid inhalation of per-oxosulfates. This can be achieved by (1) Addition of oils to bind fine particles [18], (2) Granulation to enlarge particle size [19], or (3) Formulation of water-free, oil-containing pastes [20],... 

Refined and bleached rapeseed oil were obtained from Onbio Co. Ltd. (Pucheon-Si, Korea). Table 1 presents the fatty acid composition and characteristics of rapeseed oil. Reference standards of FAMES such as palmitic, stearic, linolenic, linoleic, and oleic methyl ester of >99% purity were purchased from Sigma (St. Louis, MO). Methanol and catalysts such as KOH, NaOH, and sodium methoxide were analytical-grade chemicals. 

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