Descomposición térmica de aceite de germen de arroz para su uso como gasóleo

Ricebran oil; a non edible oil, was thermally decomposed using different loads of calcium oxide as catalyst. The fuel properties of the cracked product were evaluated as compared to those of diesel fuel. The considered properties included the calorific value, flash point, viscosity, pour point, distillation characteristics, cetane number in addition to some other fuel properties. The results had shown that the fuel properties of the decomposed oil were quite similar to those of standard diesel fuel. The calorific value was 80-90% that of diesel fuel and the viscosity was sligthy higher. The prepared fuel was advantageous over diesel fuel as the former was completely free from sulfur, which on fuel combustion produces corrosive gases of sulfur oxides.Aceite de germen de arroz, un aceite no comestible, fue descompuesto térmicamente usando diferentes cantidades de óxido cálcico como catalizador. Las propiedades combustibles del producto craqueado fueron evaluadas comparándolas con las del gasóleo. Las propiedades consideradas incluyeron el poder calorífico, punto de inflamación, viscosidad, temperatura de fluidez crítica, características de destilación, número de cetano y otras propiedades de los combustibles. Los resultados han mostrado que las propiedades combustibles del aceite descompuesto fueron bastantes similares a la de los gasóleos estándar. El poder calorífico fue del 80-90% de la del gasóleo y la viscosidad ligeramente mayor. El combustible preparado fue ventajoso sobre el gasóleo ya que el primero estaba completamente libre de sulfuro, el cual produce en la combustión del carburante gases corrosivos de óxido de azufre

Inhibition of Corrosion of Carbon Steel in Acid Solutions by Tetratriethanolamine Trioleiate

188-192The inhibition of corrosion of carbon steel by tetratriethanolamine trioleiate in 1mol/L HCl and 1mol/L H2SO4 solutions is studied. The study is carried out by weight loss, potentiodynamic polarisation techniques and scanning electron microscopy (SEM). Polarisation studies reveal that the inhibitor behaves as an anodic inhibitor in both the acids. The inhibitor is more efficient in HCl than in H2SO4 solution. The efficiency of the inhibitor increases with inhibitor concentration up to certain extent and then decreases. Weight loss studies have revealed that the inhibitor efficiency decreases with increase in temperature.</span

Surface Parameters and Corrosion Inhibition of Some Isothiouranium Derivatives

712-718Four alkyl isothiouronium halide compounds in which the alkyl groups are dodecyl, hexadecyl, and octadecyl, respectively, are prepared. The measured surface tension at various concentrations as aqueous solutions of each of these compounds at various temperatures enable the calculation of surface and thermodynamic parameters. The critical micelle concentrations of these compounds decreases with increase in temperature. The calculated free energy changes for micelle formation and ad sorption of these compounds shows that these processes are spontaneous in nature. The corrosion inhibition properties of these compounds for mild steel in sulphuric acid as determined through potentiodynamic polarization measurements, indicates that dodecyl isothiouronium bromide exhibits better inhibitor efficiency than its higher homologues. For the same compound studied, the iodide salt gives a better inhibitor efficiency than the bromide

Study of Carbon Steel Corrosion in Sulphur Media

Abstract: The aim of this work is to study the influence of adding different sulphur compounds (2, 3 dimethyl 6 methoxy 1keto 5 ethyl sulphide, dimethyl sulphoxide, dimethyl disulphide, dimethyl thiourea, dibenzothiophene and 2, 3 dimethyl 6 methoxy 1 thio 5 ethyl sulphide) on the corrosion behavior of carbon steel immersed in white technical oil (free of sulphur, nitrogen and salt content) at 150 o C and various time intervals by using weight loss measurement. These aggressive media enhanced the corrosion of carbon steel samples. It can be seen that the corrosion of carbon steel samples in presence sulphoxide compound is higher as compared to that of other sulphur compound. The inhibitive performance of three azole derivatives on corrosion of carbon steel samples exposed to these aggressive media was studied. It is clear that the inhibitive efficiency increases with the increase of the inhibitor concentration. The inhibitive efficiency percent decreases in this order