Bratislava, Slovakia
Bratislava, Slovakia

Slovnaft is an oil refining company in Slovakia. The company, located in Bratislava, is a subsidiary of MOL Group. Wikipedia.


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Kleinova A.,Slovak University of Technology in Bratislava | Vailing I.,RASOL | Labaj J.,University of Zilina | Mikulec J.,SLOVNAFT | Cvengros J.,Slovak University of Technology in Bratislava
Fuel Processing Technology | Year: 2011

Vegetable oils and animal fats are applicable as fuels in standard diesel engines after having adapted the fuel system for electronically controlled dual fuel regime oil/fat-fossil diesel. In this contribution, performance and emission characteristics of the engines running on rapeseed oil, lard, or chicken fat are given and compared to those of fossil diesel and fatty acid methyl esters. The results of engine tests of these fuels show a decrease in maximum power and maximum torque in comparison to fossil diesel due to a lower energy content of triacylglycerols. These values are influenced also by a type of the engine used at testing. When compared to fossil diesel, the opacity of oil/fat based fuels is higher for an engine with lower injection pressures while it is lower for an engine with higher injection pressures. The level of both controlled and uncontrolled emissions is low for all tested biofuels and is low also for the reference fossil diesel. The results of performance and emission tests for rapeseed oil containing 3 and 6 vol.% of anhydrous ethanol are comparable to those obtained for pure oil. In this paper, practical experiences based on long-term operation of adapted vehicle fleet fuelled with oil/fat-fossil diesel are mentioned. © 2011 Elsevier B.V. All rights reserved.


Thernesz A.,MOL Hungarian Oil and Gas Plc. | Varga Z.,MOL Hungarian Oil and Gas Plc. | Rabi I.,MOL Hungarian Oil and Gas Plc. | Czaltig Z.,MOL Hungarian Oil and Gas Plc. | Lorincova M.,SLOVNAFT
Clean Technologies and Environmental Policy | Year: 2010

The paper presents the results of feasibility study for increase of crude processing capacity and improves of energy efficiency of crude oil distillation units. Results introduce that boosting up the distillation capacity was solved while keeping the flexibility of units for processing different type crude oils. Analysis of heat exchanger network resulted significant reduction in fuel consumption and in CO 2 emission (93 × 10 6 GJ year -1 and 3,030 tCO 2 year -1, respectively). Modification of furnace of one of the distillation units showed 63 GJ kt -1 crude saving in energy and 4.5 tCO 2 kt -1 crude decrease in emission. © Springer-Verlag 2009.


In this work, cloud point extraction was applied as a separation/preconcentration step for trace Pb prior to its determination by electrothermal atomic absorption spectrometry. After complexation with ammonium pyrrolidine dithiocarbamate, the analyte was quantitatively extracted to the phase rich in the non-ionic surfactant Triton X-114. Important factors affecting extraction efficiency were investigated in detail and optimized. After separation of aqueous bulk solution from surfactant-rich phase, the final extract was diluted by 200 μL of methanol acidified with 0.2 mol L‒1 HNO3. After such a dilution, under the optimized conditions (using initial sample volume of 10 mL), the enrichment factor of 32, the detection limit of 0.06 μg L-1, the quantification limit of 0.20 μg L-1, the relative standard deviation of 3.8 % (for 2 μg L-1 of Pb; n = 14), the linearity of the calibration graph in the range of 0.2-2.4 μg L-1 (with the correlation coefficient higher than 0.995) were achieved. The optimized method was validated by the analysis of a certified reference material (TMDA-61). Extraction recoveries for the CRM and spiked model solutions were in the range of 92-101 %. Finally, the method was applied to the separation/preconcentration and determination of trace Pb in different kinds of waters. © 2016, Czech Society of Chemical Engineering. All rights reserved.


Krupcik J.,Slovak University of Technology in Bratislava | Gorovenko R.,Slovak University of Technology in Bratislava | Spanik I.,Slovak University of Technology in Bratislava | Bockova I.,SLOVNAFT | And 2 more authors.
Journal of Chromatography A | Year: 2013

One-dimensional and comprehensive two-dimensional flow modulated gas chromatography with simultaneous flame ionization and mass spectrometric detection were applied for the identification and quantification of benzene, toluene, ethyl benzene and xylenes (BTEX) as well as of all C9-C11 aromatic hydrocarbons in the low-boiling petroleum products gasoline, reformate and fluid catalytic cracking (FCC) samples. GC×GC experiments were performed on two reversed phase polarity column sets namely SLB-IL100 (25m×250μm i.d.×0.2μm df)+HP-5MS (5m×250μm i.d.×0.25μm df) and SLB-IL111 (30m×250μm i.d.×0.2μm df)+HP-5MS (5m×250μm i.d.×0.25μm df). The one-dimensional GC experiments were carried out on the same ionic liquid columns. The most powerful method is GC×GC on the SLB-111+HP-5MS column combination. Quantitative analysis of individual aromatic hydrocarbons (C6-C11) present in gasoline, reformate and fluid catalytic cracking (FCC) samples was performed by GC×GC-FID using the internal normalization method. Mass spectra obtained by GC×GC-qMSD were used for identification of the aromatic hydrocarbons in these samples. © 2013 Elsevier B.V.


Mikulec J.,SLOVNAFT | Cvengros J.,Slovak University of Technology in Bratislava | Jorikova L.,SLOVNAFT | Banic M.,SLOVNAFT | Kleinova A.,Slovak University of Technology in Bratislava
Journal of Cleaner Production | Year: 2010

The study is devoted to the issue of direct transformation of triacylglycerols (TAG) to diesel fuels applying a commercially available NiMo and NiW hydrorefining catalysts. It was proved that during hydrodesulphurisation also hydrodeoxygenation occurs and TAG can be converted to the fuel biocomponent by adding 6.5 % vol. of TAG to atmospheric gas oil. In this way, after hydroprocessing at mild conditions (temperature 320-360 °C, pressure 3.5-5.5 MPa, LHSV: 1.0 h-1 and ratio H2:HC = 500-1000 Nm3/m3, catalyst presence), gas oil containing 5-5.5% of biocomponent was prepared, characterized with standard performance and emission parameters. Performance and emission tests documented that even 5% vol. portion of bio-components reduces the controlled and uncontrolled emissions. © 2010 Elsevier Ltd. All rights reserved.


Kleinova A.,Slovak University of Technology in Bratislava | Cvengrosova Z.,Slovak University of Technology in Bratislava | Mikulec J.,SLOVNAFT | Cvengros J.,Slovak University of Technology in Bratislava
Chemical Engineering Transactions | Year: 2010

Fatty acid methyl esters (FAME) are used as alternative diesel fuel made from renewable sources. The attention is oriented to the materials that do not compete with food and feed production. Significant potential as an alternative low-cost biodiesel feedstock present used frying oils (UFO). The chemical changes of triacylglycerols which take place during frying can be so extensive that the properties of the FAME made from UFO (UFOME) should not meet all requirements of the standard EN 14 214. The key problem is FAME oligomers which lower the ester content and increase the viscosity. In this work, the results of oligomer content determination using gel permeation chromatography (GPC) and gas-liquid chromatography (GLC) are presented. Effective method for oligomer removal from UFOME is their final treatment based on UFOME distillation in vacuum film evaporator. Copyright © 2010 AIDIC Servizi S.r.l.


Takacova A.,SLOVNAFT | MacKlulak T.,Slovak University of Technology in Bratislava | Smolinska M.,Slovak University of Technology in Bratislava | Hutnan M.,Slovak University of Technology in Bratislava | Olejnikova P.,Slovak University of Technology in Bratislava
Chemical Papers | Year: 2012

The topic of this study is the pre-treatment of substrates for anaerobic digestion. Two different substrates of algae Scenedesmus subspicatus (SAG 86.81), Chlorella kessleri (LARG/1) and foliage of Prunus serrulata were subjected to anaerobic digestion. A mixture of commercially available cellulolytic enzymes (Analytical science s.r.o., Modra, Slovakia) was used for anaerobic treatment of algae while the foliage of Prunus serrulata was pre-treated by lignolytic fungi. The highest production of methane per mass of volatile solids was reached with untreated Chlorella kessleri at (0.59 ± 0.04) L g-1. The addition of cellulolytic enzymes did not increase the production of methane from the algal substrate; however, a faster substrate degradation and thus also higher speed of methane production at the beginning of cultivation was achieved. After foliage pre-treatment by fungal isolate Pleurotus pulmonarius, isolated from natural habitats, the methane production increased five times. In this way we were able to speed up the processes of biological degradation of ligno-cellulose materials and thereby to increase the production of methane. Our results show the possibility of using algae as a suitable substrate for biogas production. On the other hand, also aerobic pre-treatment of foliage (Pleurotus pulmonarius) presents a successful way for speeding up the degradation of ligno-cellulose waste leading to increased methane yields. © 2011 Institute of Chemistry, Slovak Academy of Sciences.


MacKulak T.,Slovak University of Technology in Bratislava | Smolinska M.,Slovak University of Technology in Bratislava | Olejnikova P.,Slovak University of Technology in Bratislava | Prousek J.,Slovak University of Technology in Bratislava | Takacova A.,SLOVNAFT
Chemical Papers | Year: 2012

The aim of this work was to evaluate the influence of ostazine dyes on the microbial population in environment. These dyes act as photosensitizers after irradiation by visible light. The photodynamic effect was induced in this way. The effect of irradiated water solutions of ostazine green, ostazine yellow, and ostazine blue on the Escherichia coli growth was tested. Furthermore, the effect of these dyes (at c = 3.5 μg mL-1) on bacterial growth was evaluated after their pretreatment by the Fenton reaction. Dramatic changes in dyes toxicity were observed after coloured solutions were pretreated by the Fenton reaction. © 2011 Institute of Chemistry, Slovak Academy of Sciences.


Tulik J.,Slovak University of Agriculture | Hujo L.,Slovak University of Agriculture | Stancik B.,Slovak University of Agriculture | Sevcik P.,SLOVNAFT
Journal of Central European Agriculture | Year: 2013

This paper presents the evaluation of a newly developing synthetic-based hydraulic fluid MOL Farm UTTO Synt, developed by MOL Group, Hungary. The fluid was subjected to a laboratory test by using a gear hydrostatic pump UD 25, which is used in the latest Zetor Fortera tractors. During the test, flow values were statistically evaluated and graphically displayed in the form of flow characteristics and the loss of flow efficiency. On the basis of laboratory test results, it can be concluded that the newly developing fluid meets the specified requirements and it is possible to continue in testing under operating conditions.


Kosiba J.,Slovak University of Agriculture | Hujo L.,Slovak University of Agriculture | Tulik J.,Slovak University of Agriculture | Raso M.,SLOVNAFT
Advanced Materials Research | Year: 2013

This paper deals with the lifetime test of a tractor hydraulic pump. The basic indicator of hydraulic pump lifetime is flow characteristics. This paper presents the results of the performance test of ecological hydraulic fluid. These results were subjected to statistical analysis. Based on these data, it is possible to express a minimum impact of ecological hydraulic fluid on hydraulic pump lifetime. The test was carried out in cooperation between the Department of Transport and Handling (Slovak University of Agriculture in Nitra) and Slovnaft, a.s. (joint-stock company), and supported by the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic - VEGA, ref. No 1/0857/12. © (2013)Trans Tech Publications,Switzerland.

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