The aim of this paper was to investigate how the use of zeta potential measurements on the hematite–oleate system as a function of pH could provide additional information on this system. From the literature survey it was found that the presence of oleate causes a reduction in both the zeta pote...
The aim of this paper was to review how the use of zeta potential measurements on suspensions of selected non-sulphide minerals in the presence of oleate could provide additional information on these interactions. From this literature review it was found that the presence of oleate causes a redu...
Models of sodium oleate adsorption on siderite, hematite and quartz were investigated by molecular dynamic simulation, respectively. Surface energy was calculated to confirm the cleavage plan of hematite and quartz. Both natural cleavage plane of siderite and calculated plane were used to invest...
Over the years there have been a number of instances describing a minimum in the flotation recovery of hematite in the alkaline pH region when oleate is used as the collector. These cases usually coincide with the use of a commercial oleate sample containing other fatty acids and/or salts as the...
The coagulation-dissolved air flotation for removal of sodium oleate (NaOL) from synthetic manganese leaching solution was focused in this study. It indicates that partially hydrolyzed polyacrylamide (HPAM), NaOL dosage and pH have a multiple effect on the removal efficiency of NaOL. The results...
The direct measurement of adsorbed oleate onto hematite removes the uncertainty of depletion of oleate onto non-hematite surfaces. Direct measurement of oleate onto hematite at pH 4 and as a function of pH at constant oleate addition was made using Differential Scanning Calorimetry. Oleate adsor...
The electroflotation behaviour of ultrafine chalcopyrite particles was investigated using a mechanically agitated cell. The use of sodium oleate as collector proved effective in the flotation of particles of average size of 5 µm. The results showed that chalcopyrite recovery increases with incr...
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Author.The author has requested to retract this paper as he had not sought the prior agreement of his co-worke...
We present kinetic data for the double bond and skeletal isomerization of 1-tetradecene on SAPO-11 at 142 and 180 °C. The kinetic model permitted calculation of five different rate constants for double bond movements, methyl branch formation, and dimerization, as well as the corresponding Arrhe...
The liquid-phase alkylation of benzene with 1-tetradecene was realized over dealuminated mordenites with different mesoporous surface areas and three different levels of acidity. The mordenite catalysts were characterized by N2-sorption, FTIR pyridine adsorption, and TPDA. The number of Brønsted...
Non-edible oils (Brassiceae family) were utilized for biodiesel production. Biodiesel was produced from four plants seeds oils and blended with ULSD. Two different methods were used for extraction of oil and the crude oil yields were 77.4 ± 2.14, 78.73 ± 3.1, 71.02 ± 2.15, 62.3 ± 3.4 (%) for...
In this study the continuous production of fatty acid methyl esters (FAME) and triacetin from crambe oil and methyl acetate (MA), without the use of catalysts, was investigated. The effects of the oil to MA mass ratio, reaction temperature, addition of water (in the oil) and a two-step reaction ...
This study has been conducted with the purpose of studying the tribological properties the mixture of soybean oil and used frying oil the Fatty Acid Methyl Esters(FAMEs) under boundary lubrication conditions. Tests have been conducted between steel ball and the journal bearing material sample co...
The critical temperatures and the critical pressures of methyl esters of linoleic, linolenic, and erucic acids have been measured by the pulse-heating technique. Triglycerides of these acids are a considerable fraction of many vegetable oils. The critical temperatures of methyl esters of acids f...
Picolinyl ester derivatives have proved to be of great value for the mass spectrometric location of double bonds in fatty acids. Their utility for the identification of triple bonds in a series of dimethylene-interrupted octadecadiynoic acids has now been investigated. In the electron-impact mas...
The 220 MHz PMR spectra of 143 non-conjugated alkenoic and alkynoic acids and esters are correlated so as to provide a method for the structural analysis of such compounds in general. The spectral data are explained in terms of long-range deshielding of the double bonds, triple bonds, acid and e...
Dehydrobromination of dibromo derivatives of olefinic fatty acids was accomplished using KOH in 20% aqueous ethanol under concomitant ultrasonic irradiation (20 kHz) for 30 min at ambient temperature to give the corresponding acetylenic fatty acid derivatives (52–72% yield). Ten different dibro...
Reversed-phase C18 high-performance liquid chromatography (HPLC) separation of 49 free fatty acids and their methyl esters is reported here. Separation is achieved using methanol/water gradients and detection by either UV absorbance or evaporative light scattering. The factors decreasing retenti...
6-Octadecynoic acid (6-ODA), a fatty acid with a triple bond, was identified in the methanol extract of Marrubium vulgare L. as an agonist of peroxisome proliferator-activated receptor γ (PPARγ). Fibrogenesis caused by hepatic stellate cells is inhibited by PPARγ whose ligands are clinically ...
The comparative analysis of the fatty acid composition of Cassia tora (leaves and stem) was determined using gas chromatography–mass spectrometry. Twenty-seven fatty acids were identified in C. tora (leaves and stem) which was collected from three different geographical areas of India: Lucknow ...
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