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Râmnicu Vâlcea, Romania

Vasilievici G.,Petroleum Gas University of Ploiesti | Beica V.,CESTRlN | Bombos D.,Petroleum Gas University of Ploiesti | Bombos M.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Zaharia E.,Atica Chemicals
Revista de Chimie | Year: 2011

The main method of road bitumen properties improvement consists in catalytic oxidation. In the paper are shown the results obtained in the oxidation of mass-asphalt in a discontinuous mixing device, for road bitumen. Catalytic systems used in oxidation process were iron nanoparticle, iron carboxylate and aluminum chloride. Oxidation efficiency was evaluated by determining the main characteristics of road bitumen (penetration, softening point, ductility, Fraass breaking point, asfaltene content and characteristics of aging). Making this process in the presence of catalysts favours the reduction the term of oxidation in the manufacture of bitumen by blowing air. Catalyst of type iron nanoparticles shows a higher efficiency than the type of iron carboxylate (as such or in the presence of aluminum chloride) in the oxidation process. Source


Vasilievici G.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Toncu C.,Polytechnic University of Bucharest | Bombos D.,Petroleum Gas University of Ploiesti | Bombos M.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Zaharia E.,Atica Chemicals
Revista de Chimie | Year: 2011

Glycerol market had changes that occurred both in the appearance of a surplus of glycerol on the market, as well as a low-price. These changes occurred due to the emergence and the development of biodiesel production. One variant of interest applied on the capitalisation of glycerol resulting from biodiesel production lies in its use in the preparation of liquid fuel with high demand on the market, considering that this oxygenated compounds ensure a clean combustion. Obtaining emulsified fuels with high stability and improved flow characteristics is the way to introduce this type of fuel on the market. The emulsifying of fossil fuels with glycerol was made in mild conditions by stirring with a mechanical stirrer. In the experimental program were prepared mixtures of fuel emulsions varying glycerol content in the presence of a fatty acid monoglycerides emulsifler. Evaluation of prepared emulsions was targeted to determine stability and the specific characteristics of the main fuel (viscosity, calorific value, flash point, freezing point). Based on data obtained it is suggested the manufacture of fuel emulsions with either low, or high concentrations of glycerol. Source


Bombos D.,Petroleum Gas University of Ploiesti | Mihaescu L.,Polytechnic University of Bucharest | Pisa I.,Polytechnic University of Bucharest | Bolma I.,Ecotech Proiect | And 2 more authors.
Revista de Chimie | Year: 2011

The basic properties of glycerol, viscous liquid, chemically stable, biodegradable, flammable with high flash point, no toxicity and no irritating effect, recommends it like component for the preparation of fuels. The viscosity of glycerol is close to that of fuel oil and, on increasing temperature, it has the trend similar to that of fuel oil. Compared to liquid fossil fuels, technical glycerol has a much higher mineral mass content. Possible mineral compounds in glycerol are sodium or potassium chlorides, sodium or potassium carbonates, potassium sulfate, potassium phosphate. There have been several series of experiments performed using two experimental plants, the burner used being the type RIELLO PRESS 45N. All combustion tests carried out have shown good behavior in the ignition and combustion of the emulsion. Overall differences were not signiricant compared to fossil fuel burning alone basis. Source


Bombos D.,Petroleum Gas University of Ploiesti | Bombos M.M.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Bolocan I.,Petroleum Gas University of Ploiesti | Vasilievici G.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | And 2 more authors.
Revista de Chimie | Year: 2010

The use of emulsions water- fuel is a way to improve fuel burning, andto decrease the specific fuel consumption, while reducing ambient pollution. Preparation of emulsion fuel was performed in a laboratory installation provided with mechanical agitation. Cationic, anionic and nonionic emulsifiers were used in the preparation of emulsions both pure and mixed. Water content of the fuel emulsion preparations ranged between 5 and 30% wt. and the emulsifier content was 1.5%. The stability of the prepared emulsion was evaluated with Turbiscan Lab apparatus. Rheology behaviour of fuel emulsions prepared was achieved by determining the viscosity at a temperature of 90°C. Viscosity of fuel emulsions prepared with hydrophilic emulsifiers, alone or combined, decreased with increasing water content thereof. Their viscosity variation curve with water content presents a more pronounced slope in the range of concentration of water in that the emulsion reversal occurs. Source


Bombos D.,Petroleum Gas University of Ploiesti | Bombos M.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Bolocan I.,Petroleum Gas University of Ploiesti | Vasilievici G.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Zaharia E.,Atica Chemicals
Revista de Chimie | Year: 2010

The decrease of organic acidity of technical olein resulted from vegetable oil refining process was achieved by esterification with glycerol in presence of catalysts zinc oxide, ferrous oxide and stannous oxide in powder from. The study was made in batch regime, in a reactor provided with mechanical stirrng and autmatically adjustment of temperature. The distribution of acid centers strength of tested inorganic catalysts was determined by thermodesorption of diethylamine. The assessment of tested catalysts performances was achieved by determination of the acidity and saponification indexes of the reaction product. Source

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