By eliminating impurities and certain food components, edible oil bleaching is known to alter the composition of oils. The features of bleached oil are influenced by a number of factors, including the type of bleaching medium used, the bleaching temperature, and other factors. We analyse the peroxide, free fatty acid, acid, and iodine values, as well as the copper and iron content of bleached and crude oils to identify the features of edible oils bleached using smectite and kaolinite-rich clays. Even though every nation has naturally occurring clays that can be used to bleach oils, oil firms still spend a lot of money on bleaching earths. Even though many clay reserves are yet unexplored, more than US$ 700,000 is spent in Uganda alone each month. This research examined the trace metal composition, peroxide, acid, iodine, and free fatty acid contents of bleached and unbleached cotton-seed and sunflower seed oils. It was determined that the bleached oils were suitable for human consumption. Since silicon dioxide and aluminium oxide are ubiquitous minerals, clays are generally referred to as alumino-silicates. Clays are either kaolinites or smectites, however to bleach edible oils, montmorillonites or bentonites are used. Of all the bleached oils, the bleached oils had the most iron content decrease. The element with the least change was copper. When Kajansi clay was leached in 20% acid, the copper level in cotton oils reduced from 0.5 ppm to 0.15 ppm, while when Chelel clay was leached under the same circumstances, the decline was from 0.5 to 0.1 ppm. Iron content in sunflower oils reduced from 1.6 to 0.2 ppm when bleached with Kajansi clay leached in 20% acid, whereas it only decreased to 0.1 ppm when bleached with Chelel clay under the same circumstances. Since oleic acid has an average value in the spectrum of acids, it is principally responsible for the acidity of sunflower oils, whereas linoleic acid corresponds to cottonseed oil. For all of the clays utilised, the amounts of free fatty acid were found to vary from 3.8 to 3.2, exhibiting no discernible increase. Bleached oils had peroxide levels ranging from 1.2 to 0.8.
Friday, 1 July 2022
Characterization of Oils Bleached with Clays Using Trace Metals, Peroxide, Acid, and Iodine Values | Chapter 2 | Recent Trends in Chemical and Material Sciences Vol. 9
Friday, 29 April 2022
Adsorption Behavior of Acid-Leached Clays in Bleaching of Oil: A Descriptive Study | Chapter 02 | Current Topics on Chemistry and Biochemistry Vol. 1
The goal of this work was to characterise the bleaching of oils by examining the type of adsorptive processes that occur during the bleaching of vegetable oils using clays. According to the existing evidence, acid-leached clays had sites for adsorption of contaminants in oils. The Langmuir and Freundlich isotherms for residual contaminants in cotton and sunflower-seed oils bleached with the identical clay ingredients were linear. Increases in both the temperature of thermal activation and the concentration of acid used to leach the clay resulted in a rise in the constant, k, implying that bleaching efficiency improved. The value of n decreased as the temperature of activation and the acid concentration used to leach the clay increased, indicating that the bleaching capacity of the clay increased. Clays' surface, structural, and bleaching qualities were influenced by their mineral compositions.
Author(S) Details
I. Z. Mukasa-Tebandeke
Department of Chemistry, Makerere University, Kampala, Uganda.
P. J. M. Ssebuwufu
Department of Chemistry, Makerere University, Kampala, Uganda.
S. A. Nyanzi
Department of Chemistry, Makerere University, Kampala, Uganda.
G. W. Nyakairu
Department of Chemistry, Makerere University, Kampala, Uganda.
M. Ntale
Department of Chemistry, Makerere University, Kampala, Uganda.
F. Lugolobi
Department of Earth Sciences, Wesleyan University, Middletown, USA.
Schumann Andreas
Department of Geology, Makerere University, Kampala, Uganda.
View Book:- https://stm.bookpi.org/CTCB-V1/article/view/6521
Wednesday, 14 July 2021
Study of the Mineral Composition and Its Connection with Some Properties Important for the Sludge Flocculation Process-Examples from Omarska Mine: A Comparative Approach | Chapter 6 | Current Approaches in Science and Technology Research Vol. 9
The primary goal of this research is to characterise the mineralogical properties of two sludge samples collected from hydro-cyclone overflow created during the processing of iron ore at the Omarska mine. A comparison of mineral composition and its relationship with key features relevant to the sludge flocculation process was also carried out. Major goethite and quartz are found in the studied sludge samples, with less clay minerals and little magnetite, hematite, clinochlore, and todorokite. They have qualitatively comparable but semi-quantitatively distinct compositions. The particle size distributions in the samples are similar, with the maximum amounts of roughly 50% belonging to the finest classes of 6 m. Almost equal iron contents are present within size classes within the samples, indicating similar mineral compositions, making this system exceedingly difficult for additional separation techniques. Due to its increased density and mineral makeup, Sludge II has a faster natural settling rate. With the addition of the flocculant, settling rates in both samples increase dramatically as the liquid component increases. The effect of the flocculant on the settling rate varies depending on the mineral makeup of the samples. The ratio of the mass of floating and sinking pieces is not affected by the time of settling, and the iron content does not alter over time. Because flocculation raises the level of iron to some extent, it should be considered an appropriate approach. Sludge has a zeta potential that is generally between that of goethite and quartz, indicating particle mixing and complicated connection.
Author (S) Details
Ljiljana Tankosic
Faculty of Mining Prijedor, University of Banja Luka, Save Kovacevica bb, 79101 Prijedor, Bosnia and Herzegovina.
Pavle Tancic
Geological Survey of Serbia, Rovinjska 12, 11000 Belgrade, Serbia.
Svjetlana Sredic
Faculty of Mining Prijedor, University of Banja Luka, Save Kovacevica bb, 79101 Prijedor, Bosnia and Herzegovina.
Zoran Nedic
Faculty of Physical Chemistry, University of Belgrade, Studentski Trg 16, 11000 Belgrade, Serbia.
View Book :- https://stm.bookpi.org/CASTR-V9/article/view/1978