Хімія та хімічні технології
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Item Multiple Use of Silica-Alumina Catalyst in Hydrocarbon Resins Production(Видавництво Львівської політехніки, 2013) Voronchak, Taras; Nykulyshyn, Irena; Rypka, Anna; Gnativ, ZorianaHydrocarbon resins synthesis from C9 fraction of liquid products of diesel fuel pyrolysis when using activated bentonite clay as a catalyst at multiple use of the latter has been studied. Process is analysed in terms of the resin yield and its properties including average molecular weight, colour and bromine number. The results obtained are explained considering the catalyst characteristics. The process when using the used catalyst undergone to high temperature regeneration has also been carried out. The catalyst regeneration has been studied by thermogravimetric analysis. Reasonable application areas of the used catalyst are suggested.Item Catalytic Cooligomerization of Terpenic and Aromatic Hydrocarbons(Видавництво Львівської політехніки, 2013) Gnativ, Zoriana; Rypka, Anna; Voronchak, Taras; Nykulyshyn, IrenaMain regularities of cationic cooligomerization of terpenic hydrocarbons, being contained in turpentine, and aromatic hydrocarbons, being contained in C9 fraction of diesel fuel pyrolysis liquid products, have been found out. Homogeneous complex of aluminium chloride with ethyl acetate in organic solvent (xylene) has been suggested as a new efficient catalyst of the process.Item Покажчик авторів(Видавництво Львівської політехніки, 2013)Item Features of Stressed State and Properties of Glass Tempered by Contact Method(Видавництво Львівської політехніки, 2013) Zheplynskyy, Taras; Serkiz, OksanaThe main advantages of the new energy-saving method of glass tempering are described. It was found that the thickness of the strengthened layer and the ratio of tensile to compressive stresses is greater than in a traditional method. The influence of tempering on the value of microhardness and contact angle of glass surface was investigated.Item Adsorption mechanisms in a view of DFT and clustering-based models(Видавництво Львівської політехніки, 2013) Ziółkowska, Magda; Duda, Jan T.; Milewska-Duda, JaninaThe paper describes two approaches to mathematical description of adsorption mechanisms aimed at identification of materials porous structure, i.e. the Density Functional Theory (DFT) and the clustering based theory of adsorption (uniBET). Essential assumptions of the both theories, concerning the pore structure description, are compared and application areas are outlined for them.Item The kinetics of filtration drying of comminuted "energetic" willow(Видавництво Львівської політехніки, 2013) Mosyuk, М.; Atamanyuk, V.; Basarapa, P.; Yandrus, M.Drying is a complicated process of the heat-massexchange, which is widely used in the chemical industry as an intermediate or final stage of manufacture, on which effective organization the quality and the prime cost of a released product are dependent. More than 15% of the mined combustible is used for drying processes. Because of the usage of theoretically substantiated drying schedules and some obsolescent facility in the industry, they need in two and a half or three times more energy for the drying processes than for transforming of moisture to stream. It is known that Ukraine is an energy-dependent state and is able to satisfy only the minor part of its requirements, the another part is imported. That's why this scientific research is an acute problem and is directed to the analysing and diminishment of the energetic consumption during the production of alternative fuel.Item Comparison of extraction methods for the determination of essential oil content and composition of lavender leaves(Видавництво Львівської політехніки, 2013) Adaszyńska-Skwirzyńska, Michalina; Śmist, Małgorzata; Swarcewicz, MariaIn this paper, comparison of the volatile components composition in the samples obtained by hydrodistillation of Lavandula angustifolia leaves is described. The comparison of the lavender essential oil obtained by hydrodistillation in the Deryng and Clevenger type apparatus, according to the pharmacopoeial methods (FP VI and VII), showed the presence of the same terpenoids in both essential oils, however, the relative percentage composition of the components were different. The oils contain 37 identified compounds, of which the main are: borneol and caryophyllene oxide. Most of the compounds identified in the oils belong to monoterpenoids group (61.9-71.09%). The essential oils yields, measured after distillation according to Polish Pharmacopoeia VI (Deryng apparatus, 3 h) and VII (Clevenger type apparatus, 2 h), were the same and amounted to 0.45% v/w.Item Novel functional surface active monomers for synthesis of reactive surface active copolymers(Видавництво Львівської політехніки, 2013) Borzenkov, Mykola; Hevus, OrestNovel surface active monomers based on derivatives of ω-hydroxy carboxylic acids have been synthesized. Synthesized monomers sufficiently reduce surface tension at the aqueous solution-air interface. The copolymerization of synthesized monomers with commercial monomers in solvent and emulsion copolymerization of synthesized peroxide containing surface active monomer with styrene have been carried out. The synthesized surface active monomers have been shown to be suitable emulsifiers for obtaining polystyrene colloid dispersions. It has been ascertained that obtained surface active copolymers can form the stable interpolyelectrolyte complexes with oppositely charged polymers.Item Productivity of Self-Suction Mixers on Expense Coefficient(Видавництво Львівської політехніки, 2013) Storozhenko, V.; Shabratsky, S.Self-suction mixers are the most effective mixing devices which are used in technological schemes applying aggressive of a gas ous reagents. The known methods and calculations of mixer productivity for a gas phase are mainly associated with increased rotational speed and a mixer diameter. Changing these parameters automatically increases power to mixing. The article presents the results of research to increase the productivity of the gas by increasing the discharge coefficient..Item Bitumen emulsions based on Ukrainian surface-active substances(Видавництво Львівської політехніки, 2013) Pyshyev, Serhiy; Grytsenko, Yuriy; Koval, TetyanaBitumen emulsions can be obtained based on surface-active substances (SAS) according to DSTU B V.2.7- 129:200 produced at JSC “Barva” (Ukraine). These emulsions meet the demands of mentioned standard relative to sieve residue homogeneity, storage quality after 7 and 14 days and conventional viscosity at 25 C.