Showing papers by "Jeno Hancsók published in 2009"

Fuel Purpose Hydrotreating of Vegetable Oil on NiMo/γ-Al2O3 Catalyst

Abstract: The application of biofuels has become more important in the whole world since the last decades. Intensive research has been started for the production of biofuels which can be applied in Diesel engines and has different chemical composition from the previously used ones. Among these fuels the most important one is biogasoil (normal and iso-paraffins) produced from triglycerides with catalytic hydrotreating (special hydrocracking). The aim of present study was to investigate the applicability of commercial NiMo/γ-Al2O3 catalyst for conversion of specially pretreated Hungarian sunflower oil to produce motor fuel components. The change in the hydrotreating activity of applied catalyst, the pathways of hydrodeoxigenation reactions and the effect of process parameters (T=300–360 °C, p=20–60 bar, LHSV=0.5–2.0 h-1, H2/sunflower oil volume ratio: 400 Nm3/m3) on the yield and composition of the products were also investigated. It was concluded that on the investigated NiMo/γ-Al2O3 catalyst products with relatively high (>50%) paraffin content (T=360–380 °C, p=60 bar, LHSV=0.5–1.0 h-1) could be produced. The yield of the produced target fraction was 50.7–54.5% at these advantageous process parameters. So it is necessary to separate and recirculate the heavy fraction. In case of every investigated process parameter C18-, C17-, C16- and C15 normal paraffins were formed, i.e. both the HDO and the decarboxylation/ decarbonylation reactions took place. The cetane number of the target fractions, are very high (>80, EN standard: ≥51), but the cold flow properties of this fraction are disadvantageous. To improve this disadvantageous property it is necessary to carry out selective isomerization of the target fraction.

Development of a novel multifunctional succinic-type detergent-dispersant additive for diesel fuel

Abstract: Out of numerous additive types the detergent-dispersant (DD) additives have the most important role; their consumption is more than 50 % of the total amount of applied additives. Their function is to clean and keep clean the fuel supply system and the combustion chamber, thus the removal of deposits and the prevention of their formation. High DD efficiency of succinic-type additives is commonly known. The aim of our research work was the modification of the additive structure by the incorporation of a fatty acid methyl ester molecule into the succinic-type additive. Beside the objective to keep the advantageous properties of the conventional succinic-type additive structure, further advantageous effects were expected to be assured by the new structure of the additive. During the several steps of product design we determined the advantageous process parameters of the synthesis; we investigated the effect of the different feedstocks on the quality of the final products. Detergent-dispersant, additional antiwear and corrosion inhibiting effects of the novel additive were verified by analytical and laboratory performance tests, and by Peugeot XUD-9 engine tests. Infrared spectroscopy (IR) and magnetic nuclear resonance (NMR) tests were carried out to determine how the fatty acid methyl ester compound connects to form the novel structure of the additive.