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Leskovac, Serbia

Netinger I.,Gradevinski Fakultet Osijek | Vracevic M.,Institut IGH d.d. | Ranogajec J.,Tehnoloski Fakultet | Vucetic S.,Tehnoloski Fakultet
Gradjevinar | Year: 2014

The brick resistance was tested in the paper by direct method, and according to some indirect procedures presented in international literature and regulations. Requirements for indirect estimation of brick resistance to freeze / thaw cycles set by Canadian and U.S. standards have proven to be inapplicable, and the same applies to estimation based on pore structure. A connection between absorption/ desorption of water and brick resistance to freeze/thaw cycles was observed. Source


The effects of the coagulation/floculation conditions on clarification and filtration of the floculated particle suspension obtained by the chemical treatment of the waste oil-in-water emulsion (OWE) from a nonferrous metalworking plant were studied. The treatment involved the addition of aluminum(III) sulfate and lime to the OWE. The main goal was to define the optimum conditions for clarification and filtration of the floculated particle suspension. The factors involved were amounts lime (i.e. pH) and filter aid added the OWE on clarification and filtration rates. At pH>10, the clarification rate was increased and the final volume of the concentrated suspension (sludge) was reduced, while filter aid affected negatively the clarification rate. The filtration rate was also increased when the coagulation was carried out at pH>10. The floculated particle suspension should be concentrated before filtration in order to decrease the filtration duration. The most efficient filter aid was Celite standard supercel, its optimum initial concentration being found to be 2 g/dm3. Source


Miladinovic M.R.,Tehnoloski Fakultet | Lukic I.Z.,University of Belgrade | Stamenkovic O.S.,Tehnoloski Fakultet | Veljkovic V.B.,Tehnoloski Fakultet | Skala D.U.,University of Belgrade
Hemijska Industrija | Year: 2010

Today, homogeneous base-catalyzed methanolysis is the most frequently used method for industrial biodiesel production. High requirements for the quality of the feedstocks and the problems related to the huge amount of wastewaters have led to the development of novel biodiesel production technologies. Among them, the most important is heterogeneous base-catalyzed methanolysis, which has been intensively investigated over the last decade in order to develop new catalytic systems, optimize the reaction conditions and to recycle catalysts. These studies are a basis for continuous developent of biodiesel production on an industrial scale in the near future. The presented work summarize up-to-date studies on biodiesel production by heterogeneous base-catalyzed methanolysis. The main goals were to point out the application of different base compounds as catalysts, the methods of catalyst preparation, impregnation on carriers and recycling as well as the possibilities to improve existing base-catalyzed biodiesel production processes and to develop novel ones. Source

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